Updated on 2024/09/29

Information

 

写真a

 
HAYASHI KATSURO
 
Organization
Faculty of Engineering Department of Applied Chemistry Professor
Kyushu University Platform of Inter/Transdisciplinary Energy Research (Concurrent)
Center for Future Chemistry (Concurrent)
Center of Advanced Instrumental Analysis (Concurrent)
Faculty of Engineering Research Center for Environmental Engineering(Concurrent)
School of Engineering (Concurrent)
Graduate School of Engineering (Concurrent)
Graduate School of Integrated Frontier Sciences Department of Automotive Science(Concurrent)
Title
Professor
Contact information
メールアドレス
Tel
0928022859
Profile
Prof. Hayashi’s group covers the field of Applied Inorganic Chemistry, including synthesis of novel functional ceramic materials, and fundamental researches based on solid state chemistry and physics. They are studying not only typical metal oxide-based ceramics but also novel mixed-anion compounds with nitride, hydride, and electride. Materials functions such as ionic conduction/exchange and dielectric/conductive properties are applied to development of energy storage and electronic devices. In particular, they are interested in materials that contribute to the development of innovative energy storage devices and their composites. Research: Electroceramics, Novel Batteries, All Solid State Battery, Solid State Chemistry, Physical Chemistry of Solids Education: Inorganic Chemistry, Inorganic Materials Chemistry, Inorganic Solid State Chemistry, Ceramic Engineering

Degree

  • Ph. D (Engineering)

Research History

  • 2000.4~2004.9 科学技術振興機構 ERATO 細野透明電子活性プロジェクト 研究員

    2000.4~2004.9 科学技術振興機構 ERATO 細野透明電子活性プロジェクト 研究員

  • 2004.10~2009.11 東京工業大学 フロンティア創造共同研究センター 助手 2009.12~2014.3 東京工業大学 応用セラミックス研究所 附属セキュアマテリアル研究センター 准教授

Research Interests・Research Keywords

  • Research theme:Development of Mixed Anion Compounds toward New Functionalities

    Keyword:Oxyhydrides, Carbonitrides, Materials Process, Analysis

    Research period: 2016.8 - 2021.3

  • Research theme:Development of Novel Batteries (e.g. All Solid State Batteries)

    Keyword:Sodium, Solid electrolyte, Oxide-based All Solid-State Battery, Air Battery

    Research period: 2014.4 - 2026.3

  • Research theme:Electronic materials based on element strategy

    Keyword:transparent conductor, nanoporous, element strategy, electrode, battery

    Research period: 2013.10 - 2017.3

Papers

  • NASICON-based all-solid-state Na–ion batteries: A perspective on manufacturing via tape-casting process Invited Reviewed International journal

    2023.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    On the background of the urgent demand to realize a decarbonized society, energy storage technology plays a key role in shifting from social activities founded on the combustion of fossil fuels to those based on renewable energy resources. Toward this end, global deployment of large-scale rechargeable batteries supplying electricity to power grids is imperative, which requires widespread commercialization of high-performance and safe batteries at a low price relying on abundant and ubiquitous source materials and a cost-efficient manufacturing process. Along this line, the trend of the battery research field is currently located at a turning point: “from Li–ion to Na–ion” and “from liquid to solid electrolyte.” From the viewpoints of the distinguished oxide solid electrolyte, Na superionic conductor (NASICON), and the long-standing progress in ceramic processing, Na–ion all-solid-state batteries (Na-ASSBs) based on NASICON and its derivatives show great promise to realize an innovative and sustainable society in the future. At this moment, however, Na-ASSBs face multifaceted and formidable challenges to overcome for practical usage, mostly relating to interfacial matters in terms of interparticle and interlayer contacts. Here, we overview the recent research progress in NASICON-based solid electrolytes (SEs) from the aspects of synthetic techniques and sintering aids, particularly focusing on the tape-casting process and glass additive. We also provide insights into how to prepare electrode layers and incorporate them with an SE layer into an ASSB cell via tape casting, with the prospect of a high-capacity multilayer-stacked ASSB analogous to the multilayer ceramic capacitors (MLCCs). In addition, the feasibility of a Na metal anode in conjunction with the NASICON-type SEs and the tape-casting process toward an MLCC-type cell configuration is discussed. In the last section, we propose our ideas about future research directions in relevant fields to achieve a breakthrough for Na-ASSBs based on NASICON.

    DOI: https://doi.org/10.1063/5.0151559

  • Expanding frontiers in materials chemistry and physics with multiple anions Reviewed International journal

    Hiroshi Kageyama, #Katsuro Hayashi, Kazuhiko Maeda, J. Paul Attfield, Zenji Hiroi, James M. Rondinelli, Kenneth R. Poeppelmeier

    Nature Communications   9   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Hydride Ions in Oxide Hosts Hidden by Hydroxide Ions Reviewed International journal

    Katsuro Hayashi, Peter V. Sushko, Yasuhiro Hashimoto, Alexander L. Shluger, Hideo Hosono

    Nature Communications   6   2014.3

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  • A mixed aqueous/aprotic sodium/air cell using a NASICON ceramic separator Reviewed

    Katsuro Hayashi, Kazunari Shima, Fumiaki Sugiyama

    Journal of the Electrochemical Society   160 ( 9 )   2013.7

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    DOI: 10.1149/2.067309jes

  • Nanoporous crystal 12CaO·Al2O3 A playground for studies of ultraviolet optical absorption of negative ions Reviewed

    Katsuro Hayashi, Peter V. Sushko, David Muñoz Ramo, Alexander L. Shluger, Satoshi Watauchi, Isao Tanaka, Satoru Matsuishi, Masahiro Hirano, Hideo Hosono

    111 ( 8 )   1946 - 1956   2007.3

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    A novel nanoporous material 12CaO·Al2O3 (C12A7) offers a possibility of incorporating large concentrations (>10 21 cm-3) of a wide range of extraframework anions inside its nanopores. We have investigated, both experimentally and theoretically, optical absorption associated with several types of such anions, including F-, OH-, O-, O2-, O2 2-, and O2 2-, and assigned their optical absorption bands. It is demonstrated that the chemical identity and concentration of extraframework anions can be controlled by an appropriate treatment of "as grown" C12A7. We also show that the position of the adsorption edge is, in turn, determined by the chemical identity of the extraframework species and can be varied in the range of ∼4-6 eV. We suggest that C12A7 is a unique host material, which can be used as a playground for studying negatively charged species that are unstable in other environments.

    DOI: 10.1021/jp065793b

  • High-density electron anions in a nanoporous single crystal [Ca24Al28O64]4+ (4e-) Reviewed

    Satoru Matsuishi, Yoshitake Toda, Masashi Miyakawa, Katsuro Hayashi, Toshio Kamiya, Masahiro Hirano, Isao Tanaka, Hideo Hosono

    Science   301 ( 5633 )   626 - 629   2003.8

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    DOI: 10.1126/science.1083842

  • Maximum incorporation of oxygen radicals, O- and O2 -, into 12CaO·7Al2O3 with a nanoporous structure Reviewed

    15 ( 9 )   1851 - 1854   2003.5

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    The effects of oxygen partial pressure (pO2<sub/>) up to 400 atm on the generation of active oxygen radicals in 12CaO·7Al2O3 (C12A7) was examined using a hot isostatic pressing technique. Concentrations of superoxide (O2
    -) and oxygen anion radicals (O-), which were analyzed from a combination of electron paramagnetic spin resonance (EPR) and Raman spectroscopy, increased with pO2<sub/>. The total concentration of the radicals reached 1.7 × 1021 cm3, which is comparable to the theoretical maximum, confirmed that dominant radical incorporation process is O2- (cage) + O2 (atmosphere) → O- (cage) + O2
    - (cage). The radical incorporated C12A7 has a large magnetic susceptibility that obeys Curie's law down to 2.5 K without magnetic ordering, although a weak exchange interaction was suggested by the line narrowing of the EPR signal.

    DOI: 10.1021/cm020959g

  • Light-induced conversion of an insulating refractory oxide into a persistent electronic conductor Reviewed

    Katsuro Hayashi, Satoru Matsuishi, Toshio Kamiya, Masahiro Hirano, Hideo Hosono

    Nature   419 ( 6906 )   462 - 465   2002.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1038/nature01053

  • Microporous crystal 12CaO·7Al2O3 encaging abundant O- radicals Reviewed

    124 ( 5 )   738 - 739   2002.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    Extremely high concentrations (>1020 cm-3) of active oxygenic radicals, O- and O2
    -, have been created in the zeolitic crystal, 12CaO·7Al2O3 (C12A7), which can accommodate anions in its cavities. An increase in oxygen pressure and a decrease in water vapor pressure at high temperature enhance the formation of the radicals. The oxidation of Pt is observed on the surface of the material as a result of reaction with the active oxygens.

    DOI: 10.1021/ja016112n

  • Grain orientation dependence of the PTCR effect in niobium-doped barium titanate Reviewed

    Katsuro Hayashi, Takahisa Yamamoto, Taketo Sakuma

    Journal of the American Ceramic Society   79 ( 6 )   1669 - 1672   1996.4

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    DOI: 10.1111/j.1151-2916.1996.tb08780.x

  • First-principles prediction of ferroelectricity in defective wurtzite <i>α</i>-Ga<sub>2</sub>S<sub>3</sub>

    Shimomura, Y; Hayashi, K; Akamatsu, H

    JAPANESE JOURNAL OF APPLIED PHYSICS   63 ( 8 )   2024.8   ISSN:0021-4922 eISSN:1347-4065

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    Publisher:Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers  

    Wurtzite-type ferroelectrics have attracted much attention as next-generation ferroelectric materials due to their high spontaneous polarizations since the first experimental demonstration of polarization switching for Sc-doped AlN. However, wurtzite-type ferroelectrics require high electric fields to switch their polarization direction, resulting in small margins with breakdown electric fields. To address this issue, considerable efforts have been made to explore wurtzite ferroelectrics with moderate switching barriers. In this study, our first-principles calculations have predicted the ferroelectricity of defective wurtzite α-Ga2S3. The calculated polarization is 60 μC cm−2, which is comparable to or smaller than those of conventional wurtzite ferroelectrics. The minimum energy pathway associated with polarization switching reveals a moderate switching barrier of 67 meV/atom. The energy landscape for α-Ga2S3 is quite different from that for its isostructural Al-based counterpart α-Al2S3, which our recent theoretical study has predicted to have quadruple-well ferroelectricity. The difference in chemical bonding between cations and sulfide ions accounts for their different energy landscapes for polarization switching.

    DOI: 10.35848/1347-4065/ad6c59

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  • Na<i>M</i>Cl<sub>6</sub> (<i>M</i> = Nb and Ta): A New Class of Sodium-Conducting Halide-Based Solid Electrolytes

    Huang, Z; Yoshida, S; Akamatsu, H; Hayashi, K; Ohno, S

    ACS MATERIALS LETTERS   6 ( 5 )   1732 - 1738   2024.4   eISSN:2639-4979

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    Publisher:ACS Materials Letters  

    Highly conductive solid electrolytes (SEs) are a prerequisite for developing all-solid-state batteries. Recently, Li-ion conducting halide-based SEs have attracted enormous attention owing to their electrochemical, mechanical, and transport properties. Despite the success of Li-ion conducting halides, the research on the Na analogue remains sparse, and the reported ionic conductivities are limited. In this study, we demonstrate the significantly improved ionic conductivity in NaM5+Cl6 (M5+ = Nb, Ta) by extending the existing structural framework of the Na-ion conducting halides Na3M3+Cl6 (M3+ = Y, Er) and Na2ZrCl6. Transport analysis reveals that the cation M rules the activation energies of the resulting phases. Given that M is pivotal, a further fine-tuning of M in NaMCl6 leads to a high ionic conductivity of 0.1 mS cm-1 at 30 °C, owing to a beneficial inductive effect and enhanced migration entropy. These discoveries will provide more design strategies for Na-ion conducting halide-based SEs.

    DOI: 10.1021/acsmaterialslett.4c00315

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  • NaMCl6 (M = Nb and Ta): A New Class of Sodium-Conducting Halide-Based Solid Electrolytes Invited Reviewed International journal

    Zheng Huang, Suguru Yoshida, Hirofumi Akamatsu, Katsuro Hayashi, Saneyuki Ohno

    ACS Materials Letters   2024.4

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    DOI: https://pubs.acs.org/doi/full/10.1021/acsmaterialslett.4c00315

  • Hydrogarnet-Derived Porous Polyhedral Particles of SrFeO3-δ Perovskite Reviewed International journal

    2023.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1021/acs.chemmater.3c01150

  • NASICON-based all-solid-state Na–ion batteries: A perspective on manufacturing via tape-casting process

    Hasegawa George, Hayashi Katsuro

    APL Energy   1 ( 2 )   020902   2023.7   eISSN:27709000

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    Language:English  

    On the background of the urgent demand to realize a decarbonized society, energy storage technology plays a key role in shifting from social activities founded on the combustion of fossil fuels to those based on renewable energy resources. Toward this end, global deployment of large-scale rechargeable batteries supplying electricity to power grids is imperative, which requires widespread commercialization of high-performance and safe batteries at a low price relying on abundant and ubiquitous source materials and a cost-efficient manufacturing process. Along this line, the trend of the battery research field is currently located at a turning point: “from Li–ion to Na–ion” and “from liquid to solid electrolyte.” From the viewpoints of the distinguished oxide solid electrolyte, Na superionic conductor (NASICON), and the long-standing progress in ceramic processing, Na–ion all-solid-state batteries (Na-ASSBs) based on NASICON and its derivatives show great promise to realize an innovative and sustainable society in the future. At this moment, however, Na-ASSBs face multifaceted and formidable challenges to overcome for practical usage, mostly relating to interfacial matters in terms of interparticle and interlayer contacts. Here, we overview the recent research progress in NASICON-based solid electrolytes (SEs) from the aspects of synthetic techniques and sintering aids, particularly focusing on the tape-casting process and glass additive. We also provide insights into how to prepare electrode layers and incorporate them with an SE layer into an ASSB cell via tape casting, with the prospect of a high-capacity multilayer-stacked ASSB analogous to the multilayer ceramic capacitors (MLCCs). In addition, the feasibility of a Na metal anode in conjunction with the NASICON-type SEs and the tape-casting process toward an MLCC-type cell configuration is discussed. In the last section, we propose our ideas about future research directions in relevant fields to achieve a breakthrough for Na-ASSBs based on NASICON.

    CiNii Research

  • In-situ infrared spectroscopy analysis of proton-conducting oxy-hydroxides Ba (Zn, M) O2. 9− y (OH) 2y (M= Ta or W) Invited Reviewed International journal

    2023.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1016/j.jssc.2023.124026

  • In-situ infrared spectroscopy analysis of proton-conducting oxy-hydroxides Ba(Zn, M)O2.9-y(OH)2y (M = Ta or W)

    Arai, K; Asai, Y; Kokubo, Y; Saito, M; Inada, M; Hayashi, K; Motohashi, T

    JOURNAL OF SOLID STATE CHEMISTRY   323   2023.7   ISSN:0022-4596 eISSN:1095-726X

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    Publisher:Journal of Solid State Chemistry  

    The bonding nature of hydroxide ions in two proton-conducting oxy-hydroxides, perovskite-type Ba(Zn0.4Ta0.6)O2.9−y(OH)2y (BZT) and double perovskite-type Ba(Zn0.55W0.45)O2.9−y(OH)2y (BZW), has been studied by Fourier transform infrared spectroscopy (FT-IR) at temperatures of 40–600 ​°C. A broad absorption peak at 2500−4000 ​cm−1 attributable to O–H stretching vibration was analyzed by deconvolution into four components, assigned as two symmetric (SC) and two asymmetric (AC) proton sites in the crystal lattice. The temperature variations of peak intensities revealed a difference in proton site preference between BZT and BZW, suggesting a crucial role of B-site cationic order in the proton distribution and, thereby, the proton conductive property.

    DOI: 10.1016/j.jssc.2023.124026

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  • Enhanced Electrochemical and Transportation Properties in a NASICON-Type Na<sub>3</sub>Zr<sub>2</sub>(SiO<sub>4</sub>)<sub>2</sub>(PO<sub>4</sub>)-Na<sub>3</sub>Ti<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> Junction Prepared by Spin Coating and Glass-Ceramic Processes

    Jia, SF; Ohno, S; Wang, J; Hasegawa, G; Akamatsu, H; Hayashi, K

    ACS APPLIED ENERGY MATERIALS   6 ( 1 )   317 - 325   2022.12   ISSN:2574-0962

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    Publisher:ACS Applied Energy Materials  

    Impacts of an electrode active material with 1 μm scale thickness on the performance of an oxide-based all-solid-state battery (ASSB) have been investigated by metallic Na | Na3Zr2(SiO4)2(PO4) (NZSP) | Na3Ti2(PO4)3 (NTP) cells. Dense crystalline NTP layer is formed on NZSP ceramic electrolyte using spin coating of glass powder suspension and subsequent crystallization (glass-ceramic process). A sample with 0.6 μm thick NTP layer exhibits 0.1 C charge/discharge cycling with very small polarization (<0.03 V), and its initial capacity of ∼60 mA h g-1 is retained >80% after 60 cycles. Fast cathode kinetics also realized the 0.1 C capacity at −20 °C to be ∼80% retention. Furthermore, a facile control over the thickness of cathode films without any conductive additives in the 1 μm range demonstrated in this work enables the assessment of cathode kinetics. Electrochemical impedance spectroscopy revealed that Warburg resistance originates from an ambipolar diffusion of an electron and Na+ ion. The methodology presented here paves a way for rapid examinations of electrode material compatibility and electrode design for next-generation oxide-based ASSBs.

    DOI: 10.1021/acsaem.2c03022

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  • Enhanced Electrochemical and Transportation Properties in a NASICON-Type Na3Zr2(SiO4)2(PO4)–Na3Ti2(PO4)3 Junction Prepared by Spin Coating and Glass-Ceramic Processes Invited Reviewed International journal

    2022.12

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  • Topochemical Synthesis of LiCoF<sub>3</sub> with a High-Temperature LiNbO<sub>3</sub>-Type Structure

    Matsuo, Y; Matsukawa, Y; Kitakado, M; Hasegawa, G; Yoshida, S; Kubonaka, R; Yoshida, Y; Kawasaki, T; Kobayashi, E; Moriyoshi, C; Ohno, S; Fujita, K; Hayashi, K; Akamatsu, H

    INORGANIC CHEMISTRY   61 ( 30 )   11746 - 11756   2022.8   ISSN:0020-1669 eISSN:1520-510X

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    Language:English   Publisher:Inorganic Chemistry  

    A novel perovskite fluoride, LixCoF3, which has an exceptionally low tolerance factor (0.81), has been synthesized via low-temperature lithium intercalation into a distorted ReO3-type fluoride CoF3using organolithium reagents. Interestingly, this reaction is completed within 15 min at room temperature. Synchrotron X-ray diffractometry and optical second harmonic generation at room temperature have revealed that this compound shows a high-temperature LiNbO3-type structure (space group: R3¯ c) involving Li-Co antisite defects and A-site splitting along the c direction. A-site splitting is consistent with the prediction based on hybrid Hartree-Fock density functional theory calculations. Co-L2,3edge X-ray absorption spectroscopy, as well as bond valence sum analysis, has verified the divalent oxidation state of Co ions in the lithiated phase, suggesting that its composition is close to LiCoF3(x ≈ 1). This compound exhibits a paramagnetic-to-antiferromagnetic transition at 36 K on cooling, accompanied by weak ferromagnetic ordering. The synthetic route based on low-temperature lithiation of metal fluorides host paves the way for obtaining a new LiNbO3-type fluoride family.

    DOI: 10.1021/acs.inorgchem.2c01439

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  • Topochemical Synthesis of LiCoF3 with a High-Temperature LiNbO3-Type Structure Invited Reviewed International journal

    #Yumi Matsuo, @Yuko Matsukawa, @Masahiro Kitakado, @George Hasegawa,@ Suguru Yoshida, @Ryoto Kubonaka, @Yuya Yoshida, @Tatsushi Kawasaki, @Eiichi Kobayashi, @Chikako Moriyoshi, @Saneyuki Ohno, @Koji Fujita, @Katsuro Hayashi,@Hirofumi Akamatsu

    Inorganic chemistry   2022.7

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    DOI: https://doi.org/10.1021/acs.inorgchem.2c01439

  • Controlling Defects to Achieve Reproducibly High Ionic Conductivity in Na<sub>3</sub>SbS<sub>4</sub> Solid Electrolytes

    Shimoda, M; Maegawa, M; Yoshida, S; Akamatsu, H; Hayashi, K; Gorai, P; Ohno, S

    CHEMISTRY OF MATERIALS   34 ( 12 )   5634 - 5643   2022.6   ISSN:0897-4756 eISSN:1520-5002

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    Publisher:Chemistry of Materials  

    The ability to reproducibly synthesize highly conductive solid electrolytes (SEs) is a prerequisite for the widespread usage of solid-state batteries. However, reported ionic conductivities of SEs exhibit significant variation even in materials with the same nominal composition. In this study, the thermodynamic origin of such sample-dependent variations is discussed using sodium-ion conducting Na3SbS4 as a model SE. The impact of uncontrolled variations in elemental chemical potentials on the ionic conductivity is investigated with theory and experiments. The elemental chemical potentials are uniquely defined when the system is constrained to have zero thermodynamic degrees of freedom. First, we establish the relationship between the chemical potentials and sodium-ion conductivity in Na3SbS4 by computing the phase diagram and native defect formation energies. From these calculations, we identify two distinct three-phase equilibrium regions (zero degrees of freedom) with the highest ratio of sodium-ion conductivity, which are then experimentally probed. Transport measurements reveal an abrupt change in the bulk ion transport of the phase-pure samples, with a room-temperature ionic conductivity of 0.16-1.2 mS cm-1 with a standard deviation of 50% when the elemental chemical potentials are not controlled, that is, not uniquely defined. In contrast, we show that by controlling the chemical potentials and therefore, the defect formation energies through the experimental concept of phase boundary mapping, the sample-dependent variation is reduced to 15% with a high average ionic conductivity of 0.94 mS cm-1. This study highlights the existence of "hidden"thermodynamic states defined by their chemical potentials and the need to precisely control these states to achieve reproducibly high ionic conductivity.

    DOI: 10.1021/acs.chemmater.2c00944

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  • Controlling Defects to Achieve Reproducibly High Ionic Conductivity in Na3SbS4 Solid Electrolytes Invited Reviewed International journal

    #Masaki Shimoda, #Mayu Maegawa, @Suguru Yoshida, @Hirofumi Akamatsu, @Katsuro Hayashi, @Prashun Gorai, @Saneyuki Ohno

    Chemistry of Materials   2022.6

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    DOI: https://doi.org/10.1021/acs.chemmater.2c00944

  • Synthesis of Hydride-Doped Perovskite Stannate with Visible Light Absorption Capability

    Nakamura, M; Akamatsu, H; Fujii, K; Nambu, Y; Ikeda, Y; Kanazawa, T; Nozawa, S; Yashima, M; Hayashi, K; Maeda, K

    INORGANIC CHEMISTRY   61 ( 17 )   6584 - 6593   2022.5   ISSN:0020-1669 eISSN:1520-510X

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    Language:English   Publisher:Inorganic Chemistry  

    Narrow-gap semiconductors with visible light absorption capability have attracted attention as photofunctional materials. H--doped BaSn0.7Y0.3O3-δcontaining Sn(II) species was recently reported to absorb visible light up to 600 nm, which represents the first demonstration of oxyhydride-based visible-light-absorbers. In the present study, a more detailed investigation was made to obtain information on the synthesis and properties of H--doped perovskite-type stannate with respect to the A-site cation of the material and the preparation conditions. H--doped ASn0.7Y0.3O3-δ(A = Ba, Ba0.5Sr0.5, and Sr) obtained by the reaction of ASn0.7Y0.3O3-δprecursors with CaH2at 773 K under vacuum conditions was shown to have almost the same bandgap (ca. 2.1 eV), regardless of the A-site cation. Physicochemical measurements and theoretical calculations revealed that the identical bandgaps of H--doped ASn0.7Y0.3O3-δare due to the simultaneous shift of the midgap states composed of Sn2+with the conduction band minimum. Experimental results also indicated that the appropriate preparation conditions with respect to Y3+-substitution and the temperature for the synthesis of the ASn0.7Y0.3O3-δprecursors were essential to obtain H--doped products that have a low density of defects.

    DOI: 10.1021/acs.inorgchem.2c00398

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  • Mechanical and thermal properties of porous polyimide monoliths crosslinked with aromatic and aliphatic triamines Invited Reviewed International journal

    @Mitsuhiro Ishida, @Yutaro Sashiyama, @Hirofumi Akamatsu, @Katsuro Hayashi, @Kazuki Nakanishi, @George Hasegawa

    Journal of Sol-Gel Science and Technology   2022.5

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    DOI: https://doi.org/10.1007/s10971-022-05843-8

  • Glass-ceramic route to NASICON-type NaxTi2(PO4)3 electrodes for Na-ion batteries Invited Reviewed International journal

    #Shufan Jia, @Hirofumi Akamatsu, @George Hasegawa, @Saneyuki Ohno, @Katsuro Hayashi

    Ceramics International   2022.5

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    DOI: https://doi.org/10.1016/j.ceramint.2022.05.125

  • Sodium ion conduction in sodium lanthanum zirconate ceramics prepared by spark plasma sintering Invited Reviewed International journal

    NaotoToyomura, George Hasegawa, Kazuma Nishimi, Miki Inada, Naoya Enomoto, Katsuro Hayashi

    Scripta Materialia   200(15)   113887   2022.4

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    DOI: https://doi.org/10.1016/j.scriptamat.2021.113887

  • Synthesis of Hydride-Doped Perovskite Stannate with Visible Light Absorption Capability Invited Reviewed International journal

    @Masashi Nakamura, @Hirofumi Akamatsu, @Kotaro Fujii, @Yusuke Nambu, @Yoichi Ikeda, @Tomoki Kanazawa, @Shunsuke Nozawa, @Masatomo Yashima, @Katsuro Hayashi, @Kazuhiko Maeda

    Inorganic Chemistry   2022.4

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    DOI: https://doi.org/10.1021/acs.inorgchem.2c00398

  • Proton conductive behaviors of Ba(Zn<sub>x</sub>Nb<sub>1-x</sub>)O<sub>3-δ-y</sub>(OH)<sub>2y</sub> studied by infrared spectroscopy

    Arai, K; Saito, M; Suganami, K; Inada, M; Hayashi, K; Motohashi, T

    JOURNAL OF SOLID STATE CHEMISTRY   308   2022.4   ISSN:0022-4596 eISSN:1095-726X

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    Publisher:Journal of Solid State Chemistry  

    Proton-conductive behaviors of oxy-hydroxide perovskites Ba(ZnxNb1−x)O3−δ−y(OH)2y (BZN) were investigated by Fourier transform infrared spectroscopy (FT-IR) at 40–600 ​°C. The in-situ FT-IR analysis upon heating in flowing N2 gas revealed a broad IR peak at about 2500–3700 ​cm−1, attributed to O–H stretching vibration modes. The broadened IR peak was deconvoluted with four Gaussian components, and their relative intensities are dependent on temperature, indicating the presence of site preference of protons in the BZN crystal lattice. The proton site preference in BZN was discussed based on the comparison of spectral features between BZN and Ba(Zr0.9Y0.1)O2.95 as a reference.

    DOI: 10.1016/j.jssc.2022.122913

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  • Proton conductive behaviors of Ba (ZnxNb1− x) O3− δ− y (OH) 2y studied by infrared spectroscopy Invited Reviewed International journal

    2022.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1016/j.jssc.2022.122913

  • Proton conductive behaviors of Ba (ZnxNb1− x) O3− δ− y (OH) 2y studied by infrared spectroscopy Invited Reviewed International journal

    122913   2022.1

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    DOI: https://doi.org/10.1016/j.jssc.2022.122913

  • Electronic Origin of Non-Zone-Center Phonon Condensations: Octahedral Rotations as A Case Study Invited Reviewed International journal

    Suguru Yoshida, Hirofumi Akamatsu, Katsuro Hayashi

    Physical Review Letters   127   215701   2021.11

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    DOI: https://doi.org/10.1103/PhysRevLett.127.215701

  • Sn-Based Perovskite with a Wide Visible-Light Absorption Band Assisted by Hydride Doping Invited Reviewed International journal

    Masashi Nakamura, Hiroshi Watanabe, Hirofumi Akamatsu, Kotaro Fujii, Masatomo Yashima, George Hasegawa, Miki Inada, Katsuro Hayashi, and Kazuhiko Maeda

    Chemistry of Materials   33 ( 10 )   3631 - 3638   2021.5

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    DOI: 10.1021/acs.chemmater.1c00460

  • Variation of meso- and macroporous morphologies in resorcinol-formaldehyde (RF) gels tailored via a sol?gel process combined with soft-templating and phase separation Reviewed

    George Hasegawa, Takaya Yano, Hirofumi Akamatsu, Katsuro Hayashi, Kazuki Nakanishi

    Journal of Sol-Gel Science and Technology   2020.2

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    DOI: 10.1007/s10971-020-05236-9

  • A highly conductive Na3V2(PO4)3 ceramic sheet prepared by tape-casting method Reviewed

    Wang, He; Hasegawa, George; Akiyama, Yuto; Yamamoto, Takahisa; Inoishi, Atsushi; Akamatsu, Hirofumi; Inada, Miki; Ishihara, Tatsumi; Hayashi, Katsuro

    Electrochimica Acta   305 ( 10 )   197 - 203   2019.3

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    DOI: 10.1016/j.electacta.2019.03.057

  • Low temperature-densified NASICON-based ceramics promoted by Na2O-Nb2O5-P2O5 glass additive and spark plasma sintering Reviewed International journal

    He Wang, Keisuke Okubo, Miki Inada, George Hasegawa, Naoya Enomoto, Katsuro Hayashi

    Solid State Ionics   322   54 - 60   2018.9

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    DOI: 10.1016/j.nanoen.2018.04.074

  • Topotactic Synthesis of Mesoporous 12CaO·7Al2O3 (C12A7) Mesocrystalline Microcubes Reviewed

    2018.7

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  • A Dense NASICON Sheet Prepared by Tape-Casting and Low Temperature Sintering Reviewed International journal

    Keisuke Okubo, He Wang, Katsuro Hayashi, Miki Inada,Naoya Enomoto, George Hasegawa, Takashi Osawa, Hitoshi Takamura

    Electrochimica Acta   278   176 - 181   2018.7

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    DOI: 10.1016/j.electacta.2018.05.020

  • A liquid anode for rechargeable sodium-air batteries with low voltage gap and high safety Reviewed International journal

    Feng Liang, Xuechao Qiu, Qingkai Zhang, Yao Kan, Alicia Koo, Katsuro Hayashi, Kunfeng Chen, Dongfeng Xue, Kwun-Nam Hui, Hossein Yadegari, Xueliang Sun

    Nano Energy   574 - 579   2018.5

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    DOI: 10.1016/j.nanoen.2018.04.074

  • Stabilization mechanism of tetragonal structure in hydrothermal synthesized BaTiO3 nanocrystal Reviewed International journal

    Kenta Hongo, Shinji Kurata, Apichai Jomphoak, Miki Inada, Katsuro Hayashi, Ryo Maezono

    Inorganic Chemistry   2018.4

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    DOI: 10.1021/acs.inorgchem.8b00381

  • Dual–phase Spinel MnCo2O4 Nanocrystals with Nitrogen-doped Reduced Graphene Oxide as Potential Catalyst for Hybrid Na–Air Batteries Reviewed International journal

    244   222 - 229   2017.8

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    DOI: DOI: 10.1016/j.electacta.2017.05.100

  • Nanostructured Titanium Phosphates Prepared via Hydrothermal Reaction and Their Electrochemical Li- and Na-ion Intercalation Properties Reviewed International journal

    Zhu Yang, George Hasegawa, Kazuyoshi Kanamori, Tsutomu Kiyomura, Hiroki Kurata, Katsuro Hayashi, Kazuki Nakanishi

    CrystEngComm   19   4551 - 4560   2017.8

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    DOI: DOI: 10.1039/C7CE01123G

  • Crystallization Behavior of Iron-based Amorphous Nanoparticles Prepared Sonochemically Reviewed International journal

    Naoya Enomoto, Shingo Hirata, Miki Inada, Katsuro Hayashi

    Ultrasonics Sonochemistry   35B ( 4 )   563 - 568   2017.3

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    DOI: doi.org/10.1016/j.ultsonch.2016.04.033

  • Structural analysis and capacitive properties of carbon spheres prepared by hydrothermal carbonization Reviewed International journal

    Miki Inada, Naoya Enomoto, Jyunichi Hojyo, Katsuro Hayashi

    Advanced Powder Technology   53 ( 12 )   804 - 809   2017.3

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    DOI: DOI: 10.1016/j.apt.2016.12.014

  • Liquid exfoliation graphene sheets as catalysts for hybrid sodium-air cells Invited Reviewed International journal

    Feng Liang, Takayuki Watanabe, Katsuro Hayashi, Yaochun Yao, Wenhui Ma, Bin Yang, Yongnian Dai

    MATERIALS LETTERS   187   32 - 35   2017.1

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    DOI: 10.1016/j.matlet.2016.10.054

  • Hydrothermal Synthesis of Tetragonal Barium Titanate Rod-like Crystal 正方晶チタン酸バリウム針状結晶の水熱合成 Reviewed International journal

    Shinji Kurata, Miki Inada, Naoya Enomoto, Katsuro Hayashi

    Journal of the Society of Powder Technology, Japan 粉体工学会誌   53 ( 12 )   804 - 809   2016.12

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    DOI: http://doi.org/10.4164/sptj.53.804

  • Hybrid Sodium-Air Cell with Na[FSA-C(2)C(1)im][FSA] Ionic Liquid Electrolyte Invited Reviewed International journal

    Yao Kang, Feng Liang, Katsuro Hayashi

    ELECTROCHIMICA ACTA   218   119 - 124   2016.11

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    DOI: 10.1016/j.electacta.2016.09.113

  • Green apatites: hydride ions, electrons and their interconversion in the crystallographic channel Reviewed International journal

    Katsuro Hayashi, Hideo Hosono

    Physical Chemistry Chemical Physics   18   8186 - 8919   2016.2

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    DOI: DOI: 10.1039/C6CP00515B

  • Aqueous and Nonaqueous Sodium-Air Cells with Nanoporous Gold Cathode Reviewed International journal

    Taijyu Hashimoto, Katsuro Hayashi

    Electrocimica Acta   182 ( 10 )   809 - 814   2015.10

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    DOI: doi:10.1016/j.electacta.2015.09.153

  • Facile synthesis of nanorods of tetragonal barium titanate using ethylene glycol Reviewed International journal

    M. Inada, N. Enomoto, K. Hayashi, J. Hojo, S. Komarneni

    2015.5

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    DOI: doi:10.1016/j.ceramint.2014.12.137

  • Mixed-Aprotic-Aqueous Sodium-Air Cell with a NASICON Ceramic Separator and a Porous Carbon Electrode Reviewed International journal

    Feng Liang, Katsuro Hayashi

    The Journal of Electrochemical Society   162 ( 7 )   A1215 - A1219   2015.4

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  • C-axis oriented β″-alumina ceramics with anisotropic ionic conductivity prepared by spark plasma sintering Reviewed International journal

    2014.12

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    DOI: DOI: 10.1016/j.ssi.2014.09.003

  • Chloride-ion-stabilized strontium mayenite: Expansion of versatile material family Reviewed International journal

    Yingchao Dong, Katsuro Hayashi, Hiroki Nozoe, Yutaka Shinoda, Hideo Hosono

    Journal of the American Ceramic Society   97 ( 12 )   4037 - 4044   2014.6

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  • Formation and quantification of peroxide anions in nanocages of 12CaO·7Al2O3 Reviewed

    3 ( 40 )   18311 - 18316   2013.10

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    The concentration of peroxide (O22-) ions in the cage structures of the mayenite (12CaO·7Al2O3 or C 12A7) crystal lattice has been determined quantitatively by Raman spectroscopy combined with volumetry and electron paramagnetic spin resonance. The formation process of the O22- ion was also investigated using in situ Raman spectroscopy under controlled atmospheres. Although room temperature Raman spectroscopy showed that the equilibrium concentration of O22- ions in the cage structures increased with increased annealing temperatures (especially below 800 °C), no O22- signal was observed at very high temperatures (1350 °C) during the in situ measurements. We explain this apparent inconsistency by hypothesizing that transient atomic oxygen, possibly originating from the thermal dissociation of atmospheric O2, is formed at interstitial or cage sites within C12A7 at high temperatures and subsequently combines with O2- ions in the cages to form O22- during the cooling process.

    DOI: 10.1039/c3ra42521e

  • Thermionic electron emission from a mayenite electride-metallic titanium composite cathode Reviewed

    Toshihiro Yoshizumi, Katsuro Hayashi

    Applied Physics Express   6 ( 1 )   2013.1

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    DOI: 10.7567/APEX.6.015802

  • Simultaneous quantification of hydride ions and electrons incorporated in 12CaO·7Al 2O 3 cages by deuterium-labeled volumetric analysis Reviewed

    116 ( 15 )   8747 - 8752   2012.4

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    An extended volumetric method, combined with quadrupole mass spectroscopy (QMS), is proposed. This method enables us to distinguish and simultaneously quantify hydride (H -) ions and electrons (e -) incorporated in cages of 12CaO·7Al 2O 3 (C12A7), which is accomplished upon annealing with CaH 2. When a sample is dissolved in a deuterium chloride solution, most of the H - ions and electrons released from cages react to form HD and D 2 molecules, respectively. These isotope-labeled molecules are then detected by QMS. We have used this method to follow the concentrations of H - ions and electrons in C12A7-treated CaH 2 over the thermal treatment time. We found that during the initial seven days of treatment, both concentrations increased. Thereafter, the electron concentration begins to decrease, while the H - ion concentration continues to increase toward the theoretical maximum. This diverging behavior is due to differences in their diffusion ratios and thermodynamic stabilities.

    DOI: 10.1021/jp2106742

  • An oxyhydride of BaTiO3 exhibiting hydride exchange and electronic conductivity Reviewed

    Yoji Kobayashi, Olivier J. Hernandez, Tatsunori Sakaguchi, Takeshi Yajima, Thierry Roisnel, Yoshihiro Tsujimoto, Masaki Morita, Yasuto Noda, Yuuki Mogami, Atsushi Kitada, Masatoshi Ohkura, Saburo Hosokawa, Zhaofei Li, Katsuro Hayashi, Yoshihiro Kusano, Jung Eun Kim, Naruki Tsuji, Akihiko Fujiwara, Yoshitaka Matsushita, Kazuyoshi Yoshimura, Kiyonori Takegoshi, Masashi Inoue, Mikio Takano, Hiroshi Kageyama

    Nature Materials   11 ( 6 )   507 - 511   2012.1

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    DOI: 10.1038/nmat3302

  • Solid-state source of atomic oxygen for low-temperature oxidation processes Application to pulsed laser deposition of TiO2:N films Reviewed

    Daiki Ojima, Tetsuya Chiba, Kazunari Shima, Hidenori Hiramatsu, Hideo Hosono, Katsuro Hayashi

    Review of Scientific Instruments   83 ( 2 )   2012.1

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    DOI: 10.1063/1.3683571

  • Heavy doping of H- ion in 12CaO·7Al2O 3 Reviewed

    184 ( 6 )   1428 - 1432   2011.6

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    12CaO·7Al2O3 (C12A7, mayenite), which has a nanoscale porous structure that can accommodate extraframework species such as hydride (H-), oxide (O2-), hydroxide (OH-) ions, and electrons, has been doped with H- ions to investigate its effects as dominant extraframework species. Chemical doping with CaH2 enables the concentration of H- ions to reach almost the theoretical maximum. The concentration of H- ions is characterized by optical absorption intensity ascribed to photoionization of H- ions, and 1H magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy. Persistent electron generation, which is accompanied by the formation of an F absorption band and electrical conductivity, by irradiation with ultraviolet light at room temperature increases as the H- ion doping increases until it reaches half the theoretical maximum and then decreases as the H- ion concentration increases further. This dependence indicates that both H- and O2- ions are necessary for the generation of persistent electrons.

    DOI: 10.1016/j.jssc.2011.04.008

  • New functionalities in abundant element oxides Ubiquitous element strategy Reviewed

    Hideo Hosono, Katsuro Hayashi, Toshio Kamiya, Toshiyuki Atou, Tomofumi Susaki

    Science and Technology of Advanced Materials   12 ( 3 )   2011.6

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    DOI: 10.1088/1468-6996/12/3/034303

  • Kinetics of electron decay in hydride ion-doped mayenite Reviewed

    Katsuro Hayashi

    Journal of Physical Chemistry C   115 ( 22 )   11003 - 11009   2011.6

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    DOI: 10.1021/jp202428s

  • Iodometric determination of electrons incorporated into cages in 12CaO·7Al2O3 Crystals Reviewed

    114 ( 36 )   15354 - 15357   2010.9

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    The accurate determination of the concentration of electrons incorporated into cages in 12CaO·7Al2O3 (C12A7) has been examined using iodometry. Preliminary experiments confirmed that iodine is reduced in preference to protons by electron-enriched C12A7, even in aqueous solution. The electron concentrations in several C12A7 samples are measured using a procedure where the iodine molecules in an I2-HCl solution are partially reduced by electrons released from the samples, followed by titration of the residual iodine molecules. The accuracy of this procedure is confirmed by the excellent agreement of the results with those from thermogravimetric analysis. The reevaluated maximum electron mobility is nearly twice as high as that reported previously, and the critical electron concentration for the metal-insulator transition is revised slightly because of the accuracy of the iodometry results.

    DOI: 10.1021/jp1054364

  • Field-assisted sustainable O- ion emission from fluorine-substituted 12CaO·7Al2O3 with improved thermal stability Reviewed

    180 ( 17-19 )   1113 - 1117   2009.7

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    We examined the electric field-assisted thermionic emission of atomic oxygen radical anion (O-) in a vacuum from fluorine-substituted derivatives of 12CaO·7Al2O3 (C12A7) with a composition of (12 - x)CaO·7Al2O3·xCaF2 (0 ≤ x ≤ 0.8). Unsubstituted C12A7 easily decomposed into 5CaO{bullet operator}3Al2O3 (C5A3) and 3CaO{bullet operator}Al2O3 (C3A) above 830 °C during the emission experiment in a vacuum. The decomposition temperature range became narrower as the amount of F- ion substitution increased, e.g. the sample with x = 0.4 kept a single phase after the emission experiment at 900 °C. The emitted anionic species from the x = 0.4 sample were dominated by O- ions (∼ 92%) together with a small amount of O2- ions (∼ 4%) and F- ions (∼ 4%). The absence of an O2 gas supply to the opposite side of the emission surface led to a nearly steady co-emission of O- ions and electrons with a ratio of < 1/1. The O2 gas supply markedly enhanced the O- ion emission, and suppressed the electron emission. A sustainable and high-purity O- ion emission with a current density of 11 nA cm- 2 was achieved at 830 °C with the supply of 40 Pa O2 gas. The similarity in these emission features to the unsubstituted C12A7, together with the improved thermal stability demonstrates that the F- ion-substituted C12A7 is a promising material for higher intensity O- ion emission at higher temperatures.

    DOI: 10.1016/j.ssi.2009.04.018

  • Intense atomic oxygen emission from incandescent zirconia Reviewed

    Katsuro Hayashi, Tetsuya Chiba, Jiang Li, Masahiro Hirano, Hideo Hosono

    Journal of Physical Chemistry C   113 ( 22 )   9436 - 9439   2009.6

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    DOI: 10.1021/jp902159p

  • Oxygen ion conduction in 12CaO·7Al2O3 O2- conduction mechanism and possibility of O- fast conduction Reviewed

    180 ( 6-8 )   550 - 555   2009.5

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    12CaO·7Al2O3 (C12A7) with a unique nano-porous structure and free O2- ions entrapped in sub-nanometer-sized cages is a fast oxygen-ion-conducting material. These free O2- may be replaced by various oxygen-related species, OH-, O2- and O-, by tuning the atmosphere during the heat treatment. We examined the conduction mechanism for stoichiometric C12A7 (C12A7:O2-), in which O2- ions exist as counter anions in sub-nanometer-sized cages, by Raman measurement of C12A7:O2- annealed in a dry 18O2 atmosphere. It was revealed that the primary ion conducting species is an O2- ion which diffuses via exchange with O2- in the cage wall. An experimental result on the sample containing O- ions implied that O- is more mobile than O2- in C12A7. Ab initio calculations on the diffusion paths of O2- and O- ions in C12A7 supported the above experimental results.

    DOI: 10.1016/j.ssi.2008.10.015

  • Humidity-sensitive electrical conductivity in Ca12 Al14-x Six O32 Cl2+x (0≤x≤3.4) ceramics Reviewed

    12 ( 2 )   2009.1

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    The effect of humidity on the electrical conductivity in porous and dense ceramics of Ca12 Al14-x Six O32 Cl2+x (x=0, 1.7, 3.4) with a mayenite structure was examined at room temperature. Surface ionic conductivity was enhanced by increasing the humidity. The sample with x=3.4, which had a porosity of 30%, exhibited the largest conductivity change of about 4 orders of magnitude over the relative humidity range of 10-90% at 25°C. The presence of Cl- ions on the surface most likely enhances the formation of hydronium ions which are responsible for proton transfer in physisorbed water layers.

    DOI: 10.1149/1.3032908

  • Sustainable thermionic O- emission from stoichiometric 12CaO7 Al2O3 with nanoporous crystal structure Reviewed

    Jiang Li, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

    Journal of the Electrochemical Society   156 ( 1 )   2009.1

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    DOI: 10.1149/1.2999055

  • Solid state syntheses of 12SrO·7Al2O3 and formation of high density oxygen radical anions, O- and O 2 - Reviewed

    20 ( 19 )   5987 - 5996   2008.10

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    A new synthetic route via a solid-state reaction, the crystal structure of 12SrO·Al2O3 (S12A7) incorporated with OH- ions, and the formation of oxygen radical anions in S12A7 have been examined. Investigations using X-ray powder diffraction and thermogravimetric and evolved gas combined analyses demonstrate that homogenization promoted by molten Sr(OH)2 hydrates and the presence of Sr-hydrogarnet precursors play crucial roles in the formation of S12A7. Rietveld analyses confirm the lattice framework of S12A7 has a structure identical to that of the nanoporous crystal 12CaO·7Al2O3 (C 12A7, a mayenite structure) and demonstrate that two Sr2+ ions (pole Sr2+ ions) on the S4 axis of a cage displace toward the cage center owing to the accommodation of an OH - ion. An electron paramagnetic resonance study demonstrates that oxygen radical anions, O2 - and O-, are generated in the cages with concentrations on the order of 1020 cm-3 each by oxygen annealing. From the g-values observed at 77 K, the oxygen radical anions are interpreted as being sandwiched between the two pole Sr2+ ions rather than adsorbed on one side.

    DOI: 10.1021/cm800666p

  • Fabrication and transport properties of 12CaO · 7Al 2O 3 (C12A7) electride nanowire Reviewed

    205 ( 8 )   2047 - 2051   2008.8

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    Electron-doped 12CaO · 7Al 2O 3 (C12A7) nanowires (NWs) were fabricated by two approaches. First, spatially selective electron doping of C12A7 films was examined by using a chemical method specific to C12A7. However, the conductive NW was not formed due to diffusion of oxygen in the C12A7 films to the conductive area. Secondly, a combination of dry etching and electron doping was examined. NWs with conductivities ∼6 S/cm at 300 K were successfully fabricated by this method. The temperature dependence of the conductivity in the NWs exhibited almost degenerated conduction down to 5 K.

    DOI: 10.1002/pssa.200778901

  • Fabrication of room temperature-stable 12CaO · 7Al 2 O 3 electride A review Reviewed

    18 ( SUPPL. 1 )   5 - 14   2007.10

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    12CaO · 7Al 2O 3 (C12A7) electride, which is synthesized by replacing free oxygen ions in cages with electron anions, has distinct advantages over electrides reported so far in respect of thermal and chemical stability and flexible preparation of various sample forms including single crystal, thin film, polycrystalline bulk and powder. These advantages, together with the fact that the concentration of the electron anions is controlled in a wide range according to a synthetic process, make the C12A7 electride attract growing attentions from both scientific and practical points of views. This paper reviews several chemical and physical synthetic processes of the C12A7 electride including thermal treatment of C12A7 under metal vapor and reducing gas atmospheres, hot Ar + ion implantation, solidification of the strongly reduced C12A7 melt, and crystallization of the reduced glass in vacuum. Each process, having its own suitability for a specific form of the electride, has unique advantages such as a completeness of anion replacement, mass production capability and controllability of the electron-doped area. Electronic and optical properties of the resulting electrides prepared by the different process are briefly discussed in terms of the feature of the processes.

    DOI: 10.1007/s10854-007-9183-y

  • Vibrational dynamics and oxygen diffusion in a nanoporous oxide ion conductor 12CaO·7Al2O3 studied by18O labeling and micro-Raman spectroscopy Reviewed

    111 ( 40 )   14855 - 14861   2007.10

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    Nanoporous oxide 12CaO·7Al2O3 (C12A7) is a fast oxide-ion conductor that may encage various types of anionic oxygen species such as O2-, O2 -, O2 2-, and O- in its crystallographic cages. The C12A7 single crystals thermally annealed in 18O2 were examined by micro-Raman spectroscopy. The symmetric properties and the origin of Raman bands were analyzed by the isotope shift and the depolarization on the bases of the crystal symmetry of C12A7, and the Raman band due to the stretching mode of extraframework O2 2- was identified. Spatially resolved measurements of the isotope shift of the Raman bands in a partially 18O-substituted sample indicated that the local fraction of 18O is equal between the framework and extraframework sites, demonstrating that the substitution of O2- ions in the C12A7 framework is as fast as the formation of extraframework oxygen species by thermal oxygen loading. It strongly suggests that the extraframework oxygen species diffuse by replacing oxygens in the framework sites, rather than simply permeating through intercage openings.

    DOI: 10.1021/jp074248n

  • Anion incorporation-induced cage deformation in 12CaO·7Al 2O 3 crystal Reviewed

    36 ( 7 )   902 - 903   2007.7

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    Effects of O 2- or OH - ion incorporation on the cage geometry in 12CaO·7Al 2O 3 (C12A7) crystals are examined by the maximum entropy method (MEM)/Rietveld analyses of synchrotron powder X-ray diffraction data. Presence of an extraframework anion in a cage causes inward displacements of two Ca 2+ ions axially coordinating to the anion. The OHion locates at the cage center and induces smaller symmetric displacements of the two Ca 2+ ions, while the O 2- ion likely locates on off-axis positions and induces larger asymmetric Ca 2+ ion displacements.

    DOI: 10.1246/cl.2007.902

  • Metallic state in a lime-alumina compound with nanoporous structure Reviewed

    Sung Wng Kim, Satoru Matsuishi, Takatoshi Nomura, Yoshiki Kubota, Masaki Takata, Katsuro Hayashi, Toshio Kamiya, Masahiro Hirano, Hideo Hosono

    Nano Letters   7 ( 5 )   1138 - 1143   2007.5

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    DOI: 10.1021/nl062717b

  • Active anion manipulation for emergence of active functions in the nanoporous crystal 12CaO·7Al2O3 A case study of abundant element strategy Reviewed

    42 ( 6 )   1872 - 1883   2007.3

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    This article reviews our approach to render 12CaO·7Al 2O3 (C12A7) electronically active using a new concept of 'active anion manipulation', where nanostructures embedded within the C12A7 crystal lattice are intentionally utilized to generate chemically unstable ('water-free active') anions. Anionic active oxygen radicals, O- and O 2 - , are formed efficiently in C12A7 cages under high oxygen activity conditions. The configuration and dynamics of O 2 - in cages are revealed by a combination of continuous-wave and pulsed electron paramagnetic resonance (EPR). It is demonstrated that metal-loaded C12A7 is a promising oxidation catalyst for syngas (CO + H 2) formation from methane. Furthermore, the O- ion, the strongest oxidant among active oxygen species, can be extracted from the cage into an external vacuum by applying an electric field with thermal assistance, generating a high-density O- beam in the order of μA cm -2. In contrast, heat treatment of C12A7 in a hydrogen atmosphere forms H- ions in the cages. The resultant C12A7:H- exhibits a persistent insulator-conductor conversion upon ultraviolet-light or electron-beam irradiation. The irradiation-induced conversion mechanism is examined by first-principle theoretical calculations. Furthermore, the presence of a severely reducing environment causes the complete substitution of electrons for anions in the cages. The resulting C12A7:e-, which exhibits excellent stability and an electrical conductivity greater than 100 S cm -1, is regarded as an 'electride', an ionic compound in which electrons serve as anions. The C12A7 electride exhibits a high potential for applications involving cold cathode and thermal field electron emissions due to its small work function. Electride fabrication methods suitable for large-scale production via melt processing are described. It is also demonstrated that proton or inert gas ion implantations into C12A7 thin films at elevated temperatures are effective for both H- and electron doping.

    DOI: 10.1007/s10853-006-1316-9

  • Functionalities of a nanoporous crystal 12CaO·7Al2O 3 originating from the incorporation of active anions Reviewed

    80 ( 5 )   872 - 884   2007.1

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    A cage structure formed in a positively charged lattice framework of 12CaO-7Al2O3 (C12A7) is utilized to incorporate and release chemically unstable anions, imparting chemical and electronic activities to this material. High concentrations of oxygen radical anions, i.e. O - and O2
    -, are formed efficiently in these cages under a high oxygen activity condition. The O-ion, which is the strongest oxidant among all the reactive oxygen species, can be extracted from the cages into an external vacuum by applying an electric field with thermal assistance. In contrast, hydrogen-reduction processes allow the formation of hydride (H-) ions in the cage. H- ion-incorporated C12A7 exhibits a persistent insulator-conductor conversion upon irradiation with ultraviolet-light or electron-beam. The irradiation-induced conversion mechanism and electronic transport characteristics are discussed on the basis of experimental evidence and first-principle theoretical calculations. Electrons released from the H- ions are trapped by the cages and subsequent inter-cage hopping of the electrons is responsible for the electrical conduction. Furthermore, a severe reducing environment enables us to substitute electrons almost completely for anions in the cages, forming a stable inorganic electride. Finally, the formation of these active anions in this material is examined in terms of electronic structures, thermodynamics, and structural features of the cage.

    DOI: 10.1246/bcsj.80.872

  • Electron carrier generation in a refractory oxide 12CaO·7Al 2O3 by heating in reducing atmosphere Conversion from an insulator to a persistent conductor Reviewed

    89 ( 10 )   3294 - 3298   2006.10

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    Electron carriers were generated in refractory oxide 12CaO·7Al 2O3 (C12A7) through a thermal treatment in a reducing CO/CO2 atmosphere, and the reduction process was thermodynamically analyzed. Electrical-conductive C12A7, which had an electron concentration of ∼8 × 1019 cm-3 and an electrical conductivity of ∼4 S/cm at 300 K, was obtained by extracting free O2- ions in sub-nanometer-sized cages in the C12A7 lattice and leaving electrons behind. The enthalpy for this substitutive reaction is +425 kJ/mol, suggesting that stoichiometric C12A7 is more stable in air than the C12A7 electride.

    DOI: 10.1111/j.1551-2916.2006.01213.x

  • Czochralski growth of 12CaO·7Al2O3 crystals Reviewed

    6 ( 7 )   1602 - 1605   2006.7

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    Single crystals of nanoporous 12CaO·7Al2O3 (C12A7) as large as 27 mm in diameter, 120 mm in length, and 207 g in weight have been successfully grown by the Czochralski method. We found that a 2.0% oxygen-containing nitrogen atmosphere and an iridium crucible are the critical factors for success. The crystal ingot exhibited an orange color resulting from the incorporation of Ir4+ ions of ca. 5 × 1017 cm-3, which presumably occupy Ca2+ sites. X-ray diffraction analysis indicated that the ingot obtatined was a single crystal with few domains.

    DOI: 10.1021/cg0600290

  • Synthesis of a room temperature stable 12CaO·7Al2O 3 electride from the melt and its application as an electron field emitter Reviewed

    18 ( 7 )   1938 - 1944   2006.4

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    A room temperature (RT) stable electride was realized by thermally annealing an insulating 12CaO·TAl2O3 (C12A7) single crystal in a calcium metal vapor. Here we report a simple and direct method for synthesizing polycrystalline C12A7 electride (C12A7:e-); the solidification of a "melt" in a reducing atmosphere and the crystallization of a "glass" with an oxygen-deficient composition in a vacuum. The carbon-related anion (C2
    2-) presumably serves as the template for the formation of the C12A7 phase in the solidification process and may be spontaneously released from the lattice during the cooling process, leaving mobile electrons in the lattice. Also the C2 2 ions accommodated in the glass may play a significant role in the formation of C12A7:e- during the crystallization. The polycrystalline C12A7:e- exhibits an electrical conductivity up to 5 S·cm-1 at 300 K, which corresponds to an electron concentration of ∼3 × 1019 cm-3 and a nearly equal mobility of ∼0.1 cm2·W-1·s -1 to that of the single crystalline C12A7:e-. A large current density of ∼12 μA·cm-2 is obtained in the electron field emission from a flat surface of the polycrystalline C12A7:e - with a work function of ∼0.6 eV for an applied electric field of 2.4 × 105 V·cm-1. These simple synthetic methods make it possible to produce efficiently the electride in large volume, which will facilitate the C12A7:e- research, paving a way for various applications including cold electron emission.

    DOI: 10.1021/cm052367e

  • Mechanisms of oxygen ion diffusion in a nanoporous complex oxide 12CaO7 Al2 O3 Reviewed

    Peter V. Sushko, Alexander L. Shluger, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

    Physical Review B - Condensed Matter and Materials Physics   73 ( 1 )   2006.2

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    DOI: 10.1103/PhysRevB.73.014101

  • Role of hydrogen atoms in the photoinduced formation of stable electron centers in H-doped 12CaO·7 Al2 O3 Reviewed

    73 ( 4 )   2006.2

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    In this work we investigate a variety of chemical and photoinduced processes in which different hydrogenous species including H2 molecules, H- ions, and H0 atoms interact with the bulk of a complex nanoporous oxide 12CaO·7 Al2 O3. Our results provide a detailed and consistent explanation of the recently observed phenomenon of photoinduced conversion of the insulating H-doped 12CaO·7 Al2 O3 to a conductor [K. Hayashi, Nature (London) 419, 462 (2002)]. The formation of a large and thermally stable concentration of electron centers in this process is facilitated by a large concentration (up to 1020 cm-3) of extraframework O2- naturally present in this material and homogeneously distributed in its bulk. We show that these species are able to split H2 molecules into pairs of H+ and H- ions and convert H0 atoms into H+ and e- promoting the photoinduced conversion process. The similarity of the mechanisms described in this work to those known for low-coordinated sites at MgO surfaces indicates that the formation of electronic centers in oxides interacting with hydrogenous species could be a generic feature.

    DOI: 10.1103/PhysRevB.73.045120

  • Field-induced current modulation in nanoporous semiconductor, electron-doped 12CaO·7Al2O3 Reviewed

    17 ( 25 )   6311 - 6316   2005.12

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    12CaO·Al2O3 (C12A7) has a unique crystal structure composed of positively charged cages ∼0.4 nm in inner diameter and a free oxygen ion (O2-) clathrated in one-sixth of the cages. C12A7 can be converted to inorganic electride by replacing the clathrated oxygen ions with electrons, and the electride exhibits degenerate-type conduction with room-temperature conductivities >100 S cm-1. In intermediate states, semiconductive C12A7 can be obtained by controlling electron density. In this study, we examined effects of electric field on carrier transport properties of the semiconductive C12A7 using a field-effect transistor (FET) structure targeted for future mesoscopic devices and electrochemical devices that will utilize the quantum-dot-like cage structures and chemically active clathrated anions in C12A7. FETs were fabricated using two types of samples, (i) single-crystalline bulk and (ii) polycrystalline thin films, for channels. First, conditions to form good contacts for source and drain electrodes were examined because the semiconductive C12A7 has a small work function, and it was difficult to form good electrical contacts with metals. It was found that Pt was the best metal with the lowest contact resistance to C12A7, and thermal annealing at ≥300 °C improved its non-ohmic characteristics. Electrical conductivity was modulated by 1-2 orders of magnitude by applying gate voltage. Apparent field-effect mobilities were 0.02-0.08 cm2 (V s) -1, which were comparable with the drift mobilities of the semiconductive C12A7. This is the first demonstration of a semiconductor device using an electride.

    DOI: 10.1021/cm051904s

  • Localisation assisted by the lattice relaxation and the optical absorption of extra-framework electrons in 12CaO•Al 2O 3 Reviewed

    25 ( 5-8 )   722 - 726   2005.12

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    The crystalline framework of a complex oxide 12CaO•7Al 2O 3 (C12A7) is built from positively charged sub-nanometer cages able to trap electrons. An embedded cluster approach is used to study the electronic structure and optical properties of electron-containing C12A7 for different concentration of extra-framework electrons. Our results suggest that the conduction band of the C12A7 consists of a relatively narrow band of empty cage states (cage conduction band) with one-electron energies between 5.5 and 6.1 eV above the top of the valence band (VB), and a framework conduction band at about 6.7 - 7.0 eV above the to of the VB. The gap between the cage conduction band and the framework conduction band is estimated to be about 1 - 1.5 eV. The energies of the lowest optical transitions from the top of the valence band to the cage conduction band are predicted to be at 5.2 - 5.5 eV. The extra-electrons occupy cage states, which split from the cage conduction band to about 4 eV above the top of the VB. The extra-framework electrons introduce two absorption bands with the experimental peaks at 0.4 eV and 2.8 eV. These bands are assigned to the inter-cage charge transfer and the intra-cage s-p transitions respectively. The changes in the optical absorption spectra as a function of the extra-electrons concentration are also discussed.

    DOI: 10.1016/j.msec.2005.06.047

  • Intense thermal field electron emission from room-temperature stable electride Reviewed

    Yoshitake Toda, Sung Wng Kim, Katsuro Hayashi, Masahiro Hirano, Toshio Kamiya, Hideo Hosono, Takeshi Haraguchi, Hiroshi Yasuda

    Applied Physics Letters   87 ( 25 )   1 - 3   2005.12

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    DOI: 10.1063/1.2149989

  • Hydride ion as a two-electron donor in a nanoporous crystalline semiconductor 12CaO·7Al2O3 Reviewed

    109 ( 50 )   23836 - 23842   2005.12

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    The 12CaO·7Al203 (C12A7) crystal with a nanoporous lattice framework exhibits high electrical conductivity with an activation energy of ∼ 1.5 eV when equilibrated in a hydrogen atmosphere above ∼800°C. The high conductivity is preserved in a quenched state below ∼600°C with a reduced activation energy of ∼0.8 eV, Such complex behavior in electrical conductivity is associated with incorporation of hydride ions (H-) in cages of the lattice framework. Electromotive force measurements reveal that the major carrier for the conductivity is electron with a small contribution by proton (H+), ruling out the possibility of direct intercage migration of the H- ion. A combination of these observations with the ab initio calculations leads to the conclusion that the electrons are thermally generated from the H- ion by the dissociation into two electrons and an proton, which is further converted to an OH- ion via reaction with an extraframework oxide ion (02-). The energy difference between the initial (H- + O2-) and the final (2e- + OH-) states as evaluated by the theoretical calculation is as small as ∼1 eV, which agrees well with an experimentally obtained enthalpy change, ∼1.4 eV. Thus, internal equilibration between the extraframework hydrogen and the oxygen species is responsible for the thermal generation of the carrier electron. It is also suggested that the same conductive (2e- + OH-) state is reached by the photoirradiation of H--containing C12A7. In this case the photoionization of H- forms an electron and an H o atom, which then forms an OH- ion and another electron with thermal assistance. The persistence of photoinduced conductivity is explained by the slow kinetics of the reverse process at room temperature.

    DOI: 10.1021/jp053990p

  • Hydride ion as photoelectron donor in microporous crystal Reviewed

    Satoru Matsuishi, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

    Journal of the American Chemical Society   127 ( 36 )   12454 - 12455   2005.9

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    DOI: 10.1021/ja053568m

  • Thermodynamics and kinetics of hydroxide ion formation in 12CaO·7Al 4O 3 Reviewed

    109 ( 24 )   11900 - 11906   2005.6

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    We have examined the thermodynamics and kinetics of hydroxide (OH) ions that formed in cages of 12CaO·7Al 2O 3 (C12A7) with nanoporous structures. It is confirmed using thermogravimetric-evolved gas analyses (TG-EGA) that hydration in C12A7 is mediated by a reaction between an oxide (O 2-) ion in the cage and an H 2O molecule in the atmosphere to form two OH - ions in the cages. To simply and exactly quantify the OH - content from infrared absorption measurements of OH-stretching band, we propose a method combined with a thermodynamic analysis, allowing the simultaneous determination of the molar extinction coefficient of the OH-band, enthalpy, and entropy for the hydration. Hydration enthalpy in C12A7 is extremely high compared with other oxides and was enhanced by the marked instability of O 2- ion in the cage. Consequently, high solubility of OH - ion is retained up to unusually high temperatures. Furthermore, we determined diffusion coefficients of species relevant to the hydration process and demonstrated that inward diffusion of OH - ions is the rate-determining process.

    DOI: 10.1021/jp050807j

  • Excess oxygen in 12CaO·7Al2O3 studied by thermogravimetric analysis Reviewed

    34 ( 4 )   586 - 587   2005.4

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    Oxygen radial (O2-, O-)-accommodated 12CaO·7Al2O3 (CI2A7) releases oxygen molecules at about 800 C when heated in helium. The corresponding weight loss nearly accords with that calculated from an amount of the accommodated radicals, providing solid evidence that they are formed by an oxygen gas uptake from the atmosphere. Small difference between the observed and calculated losses suggests the presence of peroxide ion, O2
    2-, which is confirmed by the enhancement of 770 cm-1 band in Raman spectra of the radical-accommodated samples.

    DOI: 10.1246/cl.2005.586

  • Electron transport behaviors across single grain boundaries in n-type BaTiO3, SrTiO3 and ZnO Reviewed

    Takahisa Yamamoto, Yukio Sato, Tomohito Tanaka, Katsuro Hayashi, Yuichi Ikuhara, Taketo Sakuma

    Journal of Materials Science   40 ( 4 )   881 - 887   2005.2

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    DOI: 10.1007/s10853-005-6505-4

  • Simple and efficient fabrication of room temperature stable electride Melt-solidification and glass ceramics Reviewed

    SungWng Kim, Masashi Miyakawa, Katsuro Hayashi, Takashi Sakai, Masahiro Hirano, Hideo Hosono

    Journal of the American Chemical Society   127 ( 5 )   1370 - 1371   2005.2

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    DOI: 10.1021/ja043990n

  • Photoinduced generation of electron anions in H-doped nanoporous oxide 12CaO·7 Al2 O3 Toward an optically controlled formation of electrides Reviewed

    86 ( 9 )   1 - 3   2005.2

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    We suggest, on the basis of detailed ab initio calculations of both ground and photoexcited states of H-doped 12CaO·7 Al2 O3 (C12A7:H), that stable high-conductivity regions can be optically generated in this insulating system. Each H- ion in C12A7:H can, under photoirradiation at 3.8-4.5 eV, produce up to two electrons and a proton that binds to the lattice network and forms OH-. Mobile electrons play a role of anions in this system. They move over subnanosized cages of the C12A7 lattice via polaron hopping. The insulating state is reversibly restored upon heating to 300 °C.

    DOI: 10.1063/1.1871359

  • Electronic insulator-conductor conversion in hydride ion-doped 12CaO·7Al2O3 by electron-beam irradiation Reviewed

    86 ( 2 )   2005.1

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    We report formation of persistent carrier electrons in hydride ion (H-) -incorporated 12CaO·7Al2O3 (C12A7) by electron-beam irradiation. The electrical conductivity of H- -doped C12A7 single crystals increases with the electron-beam irradiation dose, accompanied with a green coloration attributable to a carrier electron formation. A 25 keV electron beam with a dose of ~500 μC cm-2 fully converts the conductivity in surface layers to the depth of ~4 μm. Carrier electron formation is most likely due to electron-hole pairs generated in the electron excitation volume and subsequent energy transfer to the H- ions. The estimated carrier formation yield per an incident electron is ~30. These findings may enable a fine patterning of the conductive area without photomasks and photoresists.

    DOI: 10.1063/1.1852723

  • Formation of inorganic electride thin films via site-selective extrusion by energetic inert gas ions Reviewed

    Masashi Miyakawa, Yoshitake Toda, Katsuro Hayashi, Masahiro Hirano, Toshio Kamiya, Noriaki Matsunami, Hideo Hosono

    Journal of Applied Physics   97 ( 2 )   2005.1

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    DOI: 10.1063/1.1829151

  • Partial oxidation of methane to syngas over promoted C12A7 Reviewed

    Shuwu Yang, Junko N. Kondo, Katsuro Hayashi, Masahiro Hirano, Kazunari Domen, Hideo Hosono

    Applied Catalysis A: General   277 ( 1-2 )   239 - 246   2004.12

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    DOI: 10.1016/j.apcata.2004.09.030

  • Superoxide ion encaged in nanoporous crystal 12CaO-7Al2O 3y continuous wave and pulsed electron paramagnetic resonance Reviewed

    Satoru Matsuishi, Katsuro Hayashi, Masahiro Hirano, Isao Tanaka, Hideo Hosono

    Journal of Physical Chemistry B Materials   108 ( 48 )   18557 - 18568   2004.12

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    DOI: 10.1021/jp046963s

  • Effect of stability and diffusivity of extra-framework oxygen species on the formation of oxygen radicals in 12CaO-7Al2O3 Reviewed

    Katsuro Hayashi, Naoto Ueda, Masahiro Hirano, Hideo Hosono

    Solid State Ionics   173 ( 1-4 SPEC. ISS. )   89 - 94   2004.9

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    DOI: 10.1016/j.ssi.2004.07.057

  • Photonic materials utilizing naturally occurring nanostructures Reviewed

    Hayato Kamioka, Hidenori Hiramatsu, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

    Journal of Photochemistry and Photobiology A: Chemistry   166 ( 1-3 )   141 - 147   2004.8

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    DOI: 10.1016/j.jphotochem.2004.04.033

  • Formation of oxygen radicals in 12CaO·7Al2O3 Instability of extraframework oxide ions and uptake of oxygen gas Reviewed

    108 ( 26 )   8920 - 8925   2004.7

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    The thermodynamics and kinetics of oxygen radical formation in cages of a nanoporous crystal, 12CaO·7Al2O3, were examined during isothermal annealing in a dry oxygen atmosphere. The formation of oxygen radicals, O2
    - and O-, involves the outward diffusion of extraframework oxide ions, their oxidation by absorbed oxygen molecules to form O- and O2
    - at the surface, and subsequent inward diffusion of the oxygen radicals. The instability of the extraframework oxide ions provides the driving force for this process. Evaluating the radical formation enthalpy and entropy enabled us to determine the temperature and oxygen partial pressure dependences of equilibrium oxygen radical concentration. The rate-limiting process for the radical formation is not the surface reaction, but the total ionic diffusion process, in which the smaller diffusivity of O2
    - likely dominates the process.

    DOI: 10.1021/jp037916n

  • Natural nanostructures in ionic semiconductors Reviewed

    Toshio Kamiya, Hiromichi Ohta, Hidenori Hiramatsu, Katsuro Hayashi, Kenji Nomura, Satoru Matsuishi, Kazushige Ueda, Masahiro Hirano, Hideo Hosono

    Microelectronic Engineering   73-74   620 - 626   2004.6

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    DOI: 10.1016/j.mee.2004.03.003

  • Field emission of electron anions clathrated in subnanometer-sized cages in [Ca24Al28O64]4+(4e-) Reviewed

    Yoshitake Toda, Satoru Matsuishi, Katsuro Hayashi, Kazushige Ueda, Toshio Kamiya, Masahiro Hirano, Hideo Hosono

    Advanced Materials   16 ( 8 )   685 - 689+665   2004.4

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  • Direct characterization of grain-boundary electrical activity in doped (Ba0.6Sr0.4)TiO3 by combined imaging of electron-beam-induced current and electron-backscattered diffraction Reviewed

    Katsuro Hayashi, Takahisa Yamamoto, Yuichi Ikuhara, Taketo Sakuma

    Journal of the American Ceramic Society   87 ( 6 )   1153 - 1156   2004.1

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    DOI: 10.1111/j.1551-2916.2004.01153.x

  • Persistent electronic conduction in 12CaO·7Al2O 3 thin films produced by Ar ion implantation Selective kick-out effect leads to electride thin films Reviewed

    811   385 - 389   2004.1

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    A new method to convert 12CaO·7Al2O3 (C12A7) thin films to electronic conductor by hot Ar+ ion implantation has been developed and its mechanism is discussed. It was found that hot Ar + ion implantation extruded free O2- ions in C12A7 films by kick-out effects at fluences higher than 1×1017 cm -2, which left electrons in the cages embedded in C12A7 crystal and produced high concentration F+-like centers (∼1.4×10 21 cm-3). The resulting films show coloration and persistent electronic conduction with conductivities up to ∼1 Scm -1. On the other hand, fluences less than 1×1017 cm-2 kept the films transparent and insulating.

  • Formation and Desorption of Oxygen Species in Nanoporous Crystal 12CaO·7Al2O3 Reviewed

    16 ( 1 )   104 - 110   2004.1

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    The formation and desorption mechanisms of oxygen species in nanoporous crystal 12CaO· 7Al2O3 (C12A 7) are studied by temperature-programmed desorption (TPD), electron-spin resonance (ESR), and Raman spectroscopy. Various oxygen ion species, including O-, O2-, and O 22-, are observed to exist in C12A7 at high concentrations (∼1020 cm-3). The desorption of these oxygen species in C12A7 is proposed to proceed in three steps: (1) diffusion of oxygen species from bulk to the surface (rate-limiting step), (2) decomposition of oxygen species into oxygen molecules, and (3) release of molecular oxygen into the gas phase. Oxygen species in C12A7 can be regenerated by heating in an O2 atmosphere at higher than 400 °C, and the concentrations of O- and O2- increase with temperature. More O2 - is formed than O- at low activation temperatures, whereas nearly equal amounts of O- and O2- are formed at high temperatures around 1350 °C. At 400-700 °C, a considerable amount of molecular oxygen, O2, is suggested to be present together with other oxygen species. The formation of oxygen ion species occurs in a manner reverse to the desorption processes, with the first step involving diffusion of oxygen from the atmosphere into nanocages of C 12A7.

    DOI: 10.1021/cm034755r

  • Hopping and optical absorption of electrons in nano-porous crystal 12CaO·7Al2O3 Reviewed

    445 ( 2 )   161 - 167   2003.12

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    Recently it has been discovered that a nano-porous main group oxide 12CaO·7Al2O3 (C12A7) can be converted from a wide-gap insulator to a good transparent conductor. Using ab initio modelling we explain good conductivity of this material by very small barriers for hopping of localised electrons between neighbouring positive cages. We show that optical absorption of C12A7 in infrared region and at energies higher than 2.7 eV is due to inter-cage and intra-cage electron transitions, respectively. The proposed mechanisms can be useful in further search for conducting transparent media.

    DOI: 10.1016/S0040-6090(03)01156-8

  • Thin film fabrication of nano-porous 12CaO·7Al2O 3 crystal and its conversion into transparent conductive films by light illumination Reviewed

    445 ( 2 )   309 - 312   2003.12

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    Thin film fabrication of crystalline 12CaO·7Al2O 3 (C12A7) with zeolitic structure was examined, and their electrical and optical properties were measured. Polycrystalline thin films were prepared by post-annealing of amorphous films in oxygen atmosphere at temperatures above 800 °C. Choice of substrates was crucial for obtaining single-phase thin films. Although various oxide substrates (single crystals of Al 2O3, Y-stabilized ZrO2, MgO and silica glass) were examined, single-phase films were obtained only for MgO substrates and the other substrates reacted with the CaO component in the films during post-annealing. The optical band gap of C12A7 was evaluated to be 5.9 eV. Hydride ions were incorporated into the film by a thermal treatment in a hydrogen atmosphere at 1200 °C. The resulting transparent thin films were converted into transparent persistent electronic conductors exhibiting an electrical conductivity 6.2×10-1 Scm-1 at 300 K by ultraviolet light illumination. This is the first example of transparent conductive thin film in which conductive areas can be patterned directly by light.

    DOI: 10.1016/S0040-6090(03)01170-2

  • Fabrication of highly conductive 12CaO·7Al2O3 thin films encaging hydride ions by proton implantation Reviewed

    15 ( 13 )   1100 - 1103   2003.7

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    A method to obtain a polycrystalline thin film, where an amorphous C12A7 film was first deposited was developed. The effects of hydrogenation using thermal treatment in H2 atmosphere or proton implantation were investigated. The results indicated that the H-loaded C12A7 films provide a unique capability to realize semi-transparent electric circuits directly patterned by UV-light irradiation.

    DOI: 10.1002/adma.200304925

  • High-intensity atomic oxygen radical anion emission mechanism from 12CaO · 7 Al2O3 crystal surface Reviewed

    527 ( 1-3 )   100 - 112   2003.3

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    12CaO·7Al2O3 (C12A7) crystal is an interesting material where a large amount of O-(c) and O2-(c) can be formed and trapped in the cages when it is sintered in dry oxygen. The emissive features of this material including the emission species, temperature dependence, field dependence, emission branch ratio, emission stability, the effects of water on the emission intensity, have been investigated. The temperature and oxygen pressure dependences of the electrical conductivity have also been measured. The mechanisms of the O- emission have been discussed based on the investigations of the emission and electrical conductivity features.

    DOI: 10.1016/S0039-6028(02)02575-X

  • Electron localization and a confined electron gas in nanoporous inorganic electrides Reviewed

    Peter V. Sushko, Alexander L. Shluger, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

    Physical Review Letters   91 ( 12 )   2003.1

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    DOI: 10.1103/PhysRevLett.91.126401

  • Photo-induced insulator-semiconductor transition in 12CaO·7Al 2O3 (C12A7) Reviewed

    747   247 - 255   2003.1

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    We report the first electronic conduction in main group metal oxides (MGOs) or light-metal oxides, which are represented by alkaline-earth oxides, alumina, and silica. They are believed to be never converted to an electronic conductor. One of the MGOs, 12CaO·7Al2O3 (C12A7), has optical transparency, but electrical insulation limits intrinsic form. It is characterized by sub-nanometer sized cages in the lattice framework. Hydride ion, H- was incorporated into the cage by a thermal treatment of C12A7 single crystals or ceramics in hydrogen atmosphere. The product, C12A7:H, was colorless, transparent and a good insulator having electronic conductivity less than 10-10 S·cm-1. We found that the C12A7:H exhibits a coloration of yellowish green corresponding to optical absorptions at 2.8 and 0.4 eV with simultaneous conversion into an electronic conductor with 0.3 S·cm-1 at 300 K upon a irradiation of ultraviolet light, The conductive state continued even after the irradiation was stopped. Inversion to the insulator occurred when heated more than ∼320°C accompanying with rapid decay of the optical absorptions. When temperature rose above 550°C, H2 gas was released from the sample and the photosensitivity was lost. We consider that high concentration of F +-like centers are created by photo-released electrons from the H- anions being captured by empty cages. Further, a migration of the electrons at the F+-like centers may be responsible for the conduction. The visible light absorption loss is estimated to be only 1% for a 200 nm thick conductive C12A7:H films. The present properties provides novel applications such as direct optical writing of conducting wires on insulating transparent media.

  • Electric field emission of high density O- ions from 12CaO·7Al2O3 engineered to incorporate oxygen radicals Reviewed

    5 ( 9 )   2002.9

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    We succeeded in extracting intense O- ion beam by applying dc voltage to a microporous crystal 12CaO·7Al2O3 (C12A7) engineered to incorporate extremely large amounts of O- (1.3 × 1020 cm-3) and O2- (2.7 × 1020 cm-3) in crystallographic cages. The O- ion beam is monochromatic and the current density (∼2 μA/cm2) is higher by three orders of magnitude than the maximum value recorded for yttrium-stabilized ZrO2 (YSZ). A surface metal electrode, essential for the YSZ to dissociate a drifted O2- in the bulk into an O- and an electron on the surface, is not needed for the C12A7. The presence of extremely large concentrations of O- and O2- ions and fast oxygen-ion-conductive nature of C12A7 allow extraction of O- ions directly from the surface.

    DOI: 10.1149/1.1498970

  • Absolute emission current density of O- from 12CaO7Al 2O3 crystal Reviewed

    Q. X. Li, Katsuro Hayashi, M. Nishioka, H. Kashiwagi, M. Hirano, Y. Torimoto, H. Hosono, M. Sadakata

    Applied Physics Letters   80 ( 22 )   4259 - 4261   2002.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.1476958

  • Reproducibility of O- negative ion emission from C12A7 crystal surface Reviewed

    Quanxin Li, Katsuro Hayashi, Masateru Nishioka, Hideo Kashiwagi, Masahiro Hirano, Yoshifumi Torimoto, Hideo Hosono, Masayoshi Sadakata

    Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes   41 ( 5 )   2002.5

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  • Crystal growth of Ca12Al14O33 by the floating zone method Reviewed

    Satoshi Watauchi, Isao Tanaka, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

    Journal of Crystal Growth   237-239 ( 1 4 I )   801 - 805   2002.1

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    DOI: 10.1016/S0022-0248(01)02038-3

  • Translucent ceramics of 12CaO · 7Al2O3 with microporous structure Reviewed

    17 ( 6 )   1244 - 1247   2002.1

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    We examined the densification of 12CaO · 7Al2O3 (C12A7), which has a microporous lattice framework with a cavity of approximately 0.4 nm. Fully densified translucent ceramics are obtained when hydrated C12A7 powders prepared as precursors are sintered in a dry oxygen atmosphere at 1300°C. The average transmittance between 400-800 nm for 1-mm-thick samples is improved up to approximately 70% with a 48-h increase in the sintering time. Dissociation of water molecules at the grain-pore interface into grains which entraps hydroxide ions in the crystallographic cage, and the release of the hydroxide ions into the atmosphere during the sintering procedure are considered to play crucial roles in the pore-annihilation processes.

    DOI: 10.1557/JMR.2002.0185

  • Near-UV emitting diodes based on a transparent p-n junction composed of heteroepitaxially grown p-SrCu2O2 and n-Zno Reviewed

    H. Hosono, H. Ohta, Katsuro Hayashi, M. Orita, M. Hirano

    Journal of Crystal Growth   237-239 ( 1 4 I )   496 - 502   2002.1

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    DOI: 10.1016/S0022-0248(01)01951-0

  • Formation of potential barrier related to grain-boundary character in semiconducting barium titanate Reviewed

    Katsuro Hayashi, Takahisa Yamamoto, Yuichi Ikuhara, Taketo Sakuma

    Journal of the American Ceramic Society   83 ( 11 )   2684 - 2688   2000.11

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  • Current-voltage characteristics of Σ1 boundaries with and without cobalt ions in niobium-doped SrTiO3 bicrystals Reviewed

    83 ( 6 )   1527 - 1529   2000.1

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    Current-voltage (I-V) characteristics across Σ1 boundaries of Nb-doped SrTiO3 bicrystals were investigated with a special interest in the effect of an impurity ion, cobalt. The Σ1 boundary with cobalt ions was fabricated by hot-joining technique after evaporating metallic cobalt onto the (001) plane used for a contact plane. High-resolution transmission electron microscopy (HREM) study associated with X-ray energy dispersive spectroscopy (EDS) revealed that cobalt solved and distributed around the Σ1 boundary which was perfectly joined without any second films. It was found that the Σ1 boundary with cobalt ions exhibited a nonlinear I-V relationship while the Σ1 boundary without cobalt ions showed a linear I-V relationship. This result indicates that the presence of cobalt itself at the boundary can form a potential barrier irrespective of grain boundary coherency.

    DOI: 10.1111/j.1151-2916.2000.tb01423.x

  • Misorientation dependence of grain boundary resistivity in Nb-doped barium titanate Reviewed

    Katsuro Hayashi, Takahisa Yamamoto, Yuichi Ikuhara, Taketo Sakuma

    Key Engineering Materials   ( 181-182 )   51 - 54   2000.1

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  • Grain boundary structure and electrical properties in Nb-doped SrTiO3 bicrystals Reviewed

    Takahisa Yamamoto, Katsuro Hayashi, Yuichi Ikuhara, Taketo Sakuma

    Key Engineering Materials   ( 181-182 )   225 - 228   2000.1

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  • Chemical bonding state at grain boundaries in BaTiO3doped with a small amount of cation Reviewed

    T. Yamamoto, Katsuro Hayashi, Y. Ikuhara, T. Sakuma

    Philosophical Magazine Letters   79 ( 6 )   327 - 331   1999.1

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    DOI: 10.1080/095008399177165

  • Grain boundary structure in BaTiO3 with a small excess of Ti-site dopant Reviewed

    T. Yamamoto, Y. Ikuhara, Katsuro Hayashi, T. Sakuma

    Materials Science Forum   294-296   247 - 250   1999.1

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  • Grain boundary character dependence of potential barrier in barium titanate Reviewed

    Katsuro Hayashi, T. Yamamoto, Y. Ikuhara, T. Sakuma

    Materials Science Forum   294-296   711 - 714   1999.1

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  • Grain boundaries in BaTiO3 with a small cation nonstoichiometry Reviewed

    T. Yamamoto, Y. Ikuhara, Katsuro Hayashi, T. Sakuma

    Key Engineering Materials   169   113 - 116   1999.1

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  • Grain Boundary Potential Barrier in Barium Titanate PTC Ceramics Reviewed

    Katsuro Hayashi, T. Yamamoto, T. Sakuma

    Key Engineering Materials   157-158   199 - 206   1999.1

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  • Grain boundary electrical barriers in positive temperature coefficient thermistors Reviewed

    Katsuro Hayashi, Takahisa Yamamoto, Yuichi Ikuhara, Taketo Sakuma

    Journal of Applied Physics   86 ( 5 )   2909 - 2913   1999.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.371140

  • Direct observation of the double Schottky barrier in niobium-doped barium titanate by the charge-collection current method Reviewed

    Noriyasu Kataoka, Katsuro Hayashi, Takahisa Yamamoto, Yoshihiro Sugawara, Yuichi Ikuhara, Taketo Sakuma

    Journal of the American Ceramic Society   81 ( 7 )   1961 - 1963   1998.7

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  • Grain boundary structure in TiO2-excess barium titanate Reviewed

    Takahisa Yamamoto, Yuichi Ikuhara, Katsuro Hayashi, Taketo Sakuma

    Journal of Materials Research   13 ( 12 )   3449 - 3452   1998.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1557/JMR.1998.0469

▼display all

Books

  • Mixed Anion Compounds

    ( Role: Joint translator)

    Royal Society of Chemistry  2023.5 

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    Language:English   Book type:Scholarly book

    DOI: ISBN-10 ‏ : ‎ 183916512X ISBN-13 ‏ : ‎ 978-1839165122

  • 次世代二次電池の開発状況

    監修 金村聖志、林克郎(分担)(第二編第6章担当)( Role: Joint author)

    シーエムシー出版  2023.4 

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    Language:Japanese   Book type:Scholarly book

  • 複合アニオン化合物の科学

    稲熊宜之, 内本喜晴, 荻野拓, 越智正之, 垣花眞人, 陰山洋, 北川俊作, 木本浩司, 桑原彰秀, 小林玄器, 小林亮名, 設樂一希, 高津浩, 竹入史隆, 田部勢津久, 辻本吉廣, 長谷川哲也, @林克郎, 廣瀬靖, 本郷研太, 前園涼, 前田和彦, 鱒渕友治, 松石聡, 三上昌義, 八島正知, 山本健太郎, 山本隆文( Role: Joint author)

    丸善出版  2021.3 

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    Responsible for pages:ISBN 978-4-621-30610-9   Language:Japanese   Book type:General book, introductory book for general audience

    近年、単一の化合物中に複数のアニオン種を含む“複合アニオン化合物”が、新しい種類の無機材料として注目されている。複合アニオン化合物が取り得る配位構造や結晶構造は膨大であり、これまでにない革新的機能の発現が期待される。 本書は、そのような複合アニオン化合物の科学を体系化した世界初の教科書である。1章で複合アニオン化合物に共通する特徴を整理したのち、2章以降で合成、解析、応用、理論計算における学理と実例を、2021年3月時点の知見に基づいて解説している。

Presentations

  • Chemistry of hydride ion and proton in anion-encaging crystals: Mayenite and apatite Invited International conference

    2016.9 

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    Event date: 2016.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • セラミックス・セパレータ型ナトリウム系電池への取り組み Invited

    林 克郎

    第61回日本化学会中国四国産学連携化学フォーラム  2015.4 

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    Event date: 2015.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  • 還元性熱処理による酸化物ホストへの水素化物イオン導入 Invited

    林 克郎

    第65回応用物理学会  2018.3 

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    Language:Japanese  

    Country:Japan  

  • マイエナイト結晶を起点とした活性アニオンの評価と機能発現 Invited

    林 克郎

    日本セラミックス協会第30回秋季シンポジウム  2017.9 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  • 酸化物系セラミックNaイオン電池の研究

    林克郎

    GX実現に向けた異分野連携シンポジウム  2024.4 

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    Event date: 2024.4

    Language:Japanese  

    Venue:九州大学伊都キャンパス 稲盛財団記念館・稲盛ホール   Country:Japan  

  • 酸化物系ナトリウムイオン全固体電池にむけたガラスセラミック電極形成 Invited

    林克郎

    第3回機能性フレキシブルとインクジェット技術分科会  2024.3 

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    Event date: 2024.3

    Language:Japanese  

    Venue:オンライン   Country:Japan  

  • BaZr0.9Y0.1O2.9 への H-ドーピングと紫外照射効果

    #岡田 理,@赤松 寛文,@林 克郎

    第62セラミックス基礎科学討論会  2024.1 

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    Event date: 2024.1

    Language:Japanese  

    Venue:上智大学四谷キャンパス   Country:Japan  

  • フッ素含有ポリマーを用いた層状ペロブスカイト酸化物 NaRTiO4(R:希土類)のトポケミカルフッ素化と結晶構造解析

    #宮西あおい,@大野 真之,@林 克郎 ,@赤松 寛文

    第62セラミックス基礎科学討論会  2024.1 

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    Event date: 2024.1

    Language:Japanese  

    Venue:上智大学四谷キャンパス   Country:Japan  

  • NASICON-type electrode active materials in powder and film forms obtained by a glass-ceramic process Invited International conference

    Katsuro Hayashi

    2023.12 

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    Event date: 2023.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:China  

  • 高濃度固体複合材料中のイオン輸送制御因子の検討

    #岡﨑 直斗,@赤松 寛文、@林 克郎、@大野 真之

    2023電気化学秋季大会  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学伊都キャンパス   Country:Japan  

  • 全固体硫黄正極へのハロゲン系固体電解質の利用検討

    #柳原 祥馬,@赤松 寛文、@林 克郎、@大野 真之

    2023電気化学秋季大会  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学伊都キャンパス   Country:Japan  

  • 新規ナトリウムイオン伝導ハロゲン系固体電解質: NaMCl6 (M = Nb、 Ta)

    #Huang Zheng,@赤松 寛文、@林 克郎、@大野 真之

    2023電気化学秋季大会  2023.9 

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    Event date: 2023.9

    Language:Japanese  

    Country:Japan  

  • NASICON型 Na3V2(PO4)3のガラス-セラミックス結晶化と電気化学特性

    #Li Yuerong,#筍 勃,@赤松 寛文、@林 克郎

    2023電気化学秋季大会  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学伊都キャンパス   Country:Japan  

  • Glass-ceramic sintering for NASICON electrode and electrolytes International conference

    The International Conference on Sintering 2023  2023.8 

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    Event date: 2023.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 高温ニオブ酸リチウム型構造をもつ LixCoF3のトポケミカル合成と局所構造解析

    @赤松 寛文,#松尾 祐美,@松川 祐子,@大野 真之,@林 克郎,@(京都大学) 小野寺 陽平

    日本セラミックス協会 2023 年年会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:神奈川大学 みなとみらいキャンパス   Country:Japan  

  • トポケミカルフッ素化した層状ペロブスカイトSr1.1Tb1.9Fe2O7の結晶構造

    #伊藤 大志, @大野 真之, 林 克郎, @赤松 寛文

    第61回セラミックス基礎科学討論会  2023.1 

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    Event date: 2023.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • NZSPナシコン電解質を用いたナシコン系ガラスセラミックス電極の電気化学的特性評価

    林 克郎, #Shufan Jia, @大野 真之, #Jiang Wang, @長谷川 丈二, @赤松 寛文

    第48回固体イオニクス討論会  2022.12 

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    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:トークネットホール仙台   Country:Japan  

  • ハロゲン系固体電解質の硫黄複合正極への利用検討

    #柳原 祥馬, @赤松 寛文, 林 克郎,@大野 真之

    第48回固体イオニクス討論会  2022.12 

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    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:トークネットホール仙台   Country:Japan  

  • Fabrication and Characterization of NASICON-based All-Solid-State Battery (ASSB) Electrode Invited International conference

    2022 International Industry-University-Research-Application Cooperation Conference-Symposium on International Cooperation in Metallurgy and Energy  2022.10 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 低許容因子ペロブスカイト型フッ化物LixCoF3 のトポケミカル合成

    #松尾祐美・@松川祐子・@北角将晃・@吉田傑・@大野真之・林克郎・@赤松寛文

    学術変革領域研究(A)「超秩序構造が創造する物性科学」第4回成果報告会  2022.10 

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    Event date: 2022.10

    Language:Japanese  

    Venue:つくば市、国立研究開発法人物質・材料研究機構   Country:Japan  

  • Ruddlesden-Popper 型層状ペロブスカイトへのフッ素導入による構造歪み制御

    #伊藤大志・@吉田傑・@大野真之・林克郎・@赤松寛文

    学術変革領域研究(A)「超秩序構造が創造する物性科学」第4回成果報告会  2022.10 

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    Event date: 2022.10

    Language:Japanese  

    Venue:つくば市、国立研究開発法人物質・材料研究機構   Country:Japan  

  • H-イオンドープ BaZr0.9Y0.1O2.95の紫外誘起効果と導電性

    #岡田 理・@大野 真之・@赤松 寛文・林 克郎

    第35回秋季シンポジウム 日本セラミックス協会  2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学常三島地区   Country:Japan  

  • SPS 法により作製した Li2SrNb2O7セラミックスの誘電特性

    #秋 徹志・@赤松 寛文・@大野 真之・林 克郎

    第35回秋季シンポジウム 日本セラミックス協会  2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学常三島地区   Country:Japan  

  • Na3Zr2(SiO4)2(PO4) セラミック電解質上に形成した NASICON-型 NaxTi2(PO4)2 ガラス-セラミック電極 の電気化学特性

    #賈 淑帆・@大野 真之・@長谷川 丈二・@赤松 寛文・林 克郎

    第35回秋季シンポジウム 日本セラミックス協会  2022.9 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:徳島大学常三島地区   Country:Japan  

  • 放射光を用いた新規フッ化物LixCoF3の結晶構造・電子状態解析

    #松尾祐美,@松川祐子,@北角将晃,@長谷川丈二,@吉田傑, @久保中亮翔,@吉田悠哉,@川崎龍志,@小林英一,@森吉千佳子 @大野真之,@藤田晃司,@林克郎,@赤松寛文

    XAFS討論会・SAGA-LS成果報告会  2022.8 

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    Event date: 2022.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥栖サンメッセ 4階 ホール (佐賀県鳥栖市本鳥栖町 1819 番地)   Country:Japan  

  • Glass-ceramic NaxTi2(PO4)3 electrode on Na3Zr2Si2PO12 electrolyte and the electrochemical properties

    2022.8 

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    Event date: 2022.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 多孔質 NaZr2(PO4)3およびカーボン複合体における湿度感受伝導性とキャパシタ特性

    林 克郎

    2022年電気化学秋季大会  2022.8 

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    Event date: 2022.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:神奈川大学みなとみらいキャンパス   Country:Japan  

  • ヒドリド還元した酸素欠損ペロブスカイト化合物の点欠陥生成

    林 克郎

    複合アニオン化合物の創成と新機能-最終発表会  2022.3 

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    Event date: 2022.3

    Language:Japanese  

    Country:Japan  

  • ヒドリド還元した酸素欠損ペロブスカイト化合物の点欠陥生成

    林 克郎

    複合アニオン化合物の創成と新機能-最終発表会  2022.3 

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    Event date: 2022.3

    Language:Japanese  

    Country:Japan  

  • ハロゲン系固体電解質の安定性と全固体リチウム硫黄電池への利用

    #柳原 祥馬@林 克郎@大野 真之

    電気化学会第89回大会  2022.3 

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    Event date: 2022.3

    Language:Japanese  

    Country:Japan  

  • 等価元素置換したNa3SbS4固体電解質の結晶構造とイオン輸送の相関

    #前川 舞有@吉田 傑@赤松 寛文@林 克郎@大野 真之

    電気化学会第89回大会  2022.3 

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    Event date: 2022.3

    Language:Japanese  

    Country:Japan  

  • Glass-Ceramic Na3Ti2(PO4)3 with NASICON Structure as Anode material for Sodium Ion Battery

    2022.1 

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    Event date: 2022.1

    Language:Japanese  

    Country:Japan  

  • 水酸化物-酸化物転換過程での分相を利用した多孔質メソクリスタル

    林 克郎

    第五回複合アニオンセミナー  2020.9 

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    Event date: 2022.1

    Language:Japanese  

    Country:Japan  

  • Spark Plasma Sintering of Na-Ion Conducting Oxides, Sodium Lanthanum Zirconate Perovskite Invited International conference

    Katsuro HAYASHI, Naoto Toyomura, George Hasegawa, Kazuma Nishimi, Miki Inada, Naoya Enomoto

    2021 Maritime Silk Road International Conference on the Cooperation and Integration of Industry, Education, Research and Application in Metallurgy and Energy  2021.12 

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    Event date: 2022.1

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Point Defects and Unique Behaviors in Hydride Agent-Reduced Simple Perovskites Invited

    Katsuro Hayashi

    International Conference on Mixed Anion Compounds, December 7-10  2021.12 

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    Event date: 2022.1

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Na-Ion Conducting Oxides Prepared by Spark Plasma Sintering: Revisit of Sodium Lanthanum Zirconate Perovskite Invited International conference

    Katsuro Hayashi, Naoto Toyomura, George Hasegawa, Kazuma Nishimi, Miki Inada, Naoya Enomoto

    International Conference of Materials and Systems for Sustainability (ICMaSS2021)  2021.11 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • ブリルアンゾーン境界フォノン凍結に関する電子論.配位八面体回転の電子論的起源

    @吉田傑、@赤松寛文、@林克郎

    第 41 回電子材料研究討論会  2021.11 

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Glass-Ceramic Process of NASICON-Type Na3Ti2(PO4)3 as Anodes for Sodium Ion Battery International conference

    International Conference of Materials and Systems for Sustainability (ICMaSS2021)  2021.11 

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    Event date: 2021.11

    Language:Japanese  

    Country:Japan  

  • Na 系全固体電気二重層キャパシタにむけた多孔質 NASICON 系電解質/カーボン複合電極の作製

    #片岡 菜々子・(名古屋大学) 長谷川 丈二・@大野 真之@赤松 寛文@林 克郎

    第34回秋季シンポジウム  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Symposium, workshop panel (public)  

    Country:Japan  

  • Na イオン伝導固体電解質の熱力学的欠陥制御とそのイオン輸送への影響

    #下田 昌季,@大野 真之,@赤松 寛文,@林 克郎

    第34回秋季シンポジウム  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Symposium, workshop panel (public)  

    Country:Japan  

  • 低許容因子ペロブスカイト型フッ化物 LixCoF3のトポケミカル合成

    #松尾 祐美,@松川 祐子・北角 将晃,@赤松 寛文・(名古屋大学) 長谷川 丈二,@吉田 傑,@大野 真之@林 克郎

    第34回秋季シンポジウム  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Symposium, workshop panel (public)  

    Country:Japan  

  • 層状ペロブスカイト NaLaTiO4へのフッ素導入による配位八面体回転誘起

    #石渕 圭祐@赤松 寛文@吉田 傑@大野 真之@林 克郎

    第34回秋季シンポジウム  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Symposium, workshop panel (public)  

    Country:Japan  

  • 金属炭化物ナノシートMXeneへの遷移金属元素ドーピング

    嶋 一成, 長谷川 丈二, 稲田 幹, 榎本 尚也, 林 克郎

    日本セラミックス協会 2017年年会  2017.3 

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    Event date: 2017.3

    Language:Japanese  

    Venue:日本大学駿河台キャンパス(東京都千代田区)   Country:Japan  

  • 酸化物中の微量の水素化物イオンの特定法 Invited

    林 克郎

    日本化学会第97春季年会(2017)  2017.3 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学 日吉キャンパス (横浜市港北区)   Country:Japan  

  • Hydride Ion Doping in Hydroxyapatite International conference

    The 18th International Symposium on Eco-materials Processing and Design(ISEPD2017)  2017.2 

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    Event date: 2017.2

    Language:English  

    Country:Japan  

  • Transition metal doping into Ti3AlC2 to fabricate new composition transition metal carbide nanosheet with anionic Functional groups International conference

    The 18th International Symposium on Eco-materials Processing and Design(ISEPD2017)  2017.2 

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    Event date: 2017.2

    Language:English  

    Country:Japan  

  • Fabrication Strategy for Mesoporous SilicaTitania Photocatalyst with High Adsorbability International conference

    The 18th International Symposium on Eco-materials Processing and Design(ISEPD2017)  2017.2 

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    Event date: 2017.2

    Language:English  

    Country:Japan  

  • Febrication of Na3V2(PO4)3/NASICON bilayer thin film using Na2O-Nb2O5-P2O5 glass additives for all-solid-state solidium ion batteries

    2017.1 

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    Event date: 2017.1 - 2017.2

    Language:Japanese  

    Country:Japan  

  • Transition metal(Cr,Mn,and Fe)doping into megnetoelectric ε-Fe2O3 International conference

    嶋 一成, 河原 圭, 稲田 幹, 榎本 尚也, 林 克郎

    2017.1 

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    Event date: 2017.1

    Language:English  

    Venue:Hilton Daytona Beach and Oceancenter   Country:United States  

  • Quantitative evaluation of adsorptionphotodecomposition property on mesoporous silica-titania Invited International conference

    41st International Conference and Expo on Advanced Ceramics and Composites  2017.1 

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    Event date: 2017.1

    Language:English  

    Country:United States  

  • 水熱炭化カーボンスフィアのマイクロ-メソ-マクロ孔制御とキャパシタ特性

    岡崎 亮太, 稲田 幹, 長谷川 丈二, 榎本 尚也, 林 克郎

    第55回セラミックス基礎科学討論会  2017.1 

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    Event date: 2017.1

    Language:Japanese  

    Venue:岡山コンベンションセンター(岡山県岡山市)   Country:Japan  

  • ハイドロガーネット前駆体の液相合成とC12A7エレクトライドの作製

    守谷 静香, 稲田 幹, 長谷川 丈二, 榎本 尚也, 林 克郎

    第55回セラミックス基礎科学討論会  2017.1 

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    Event date: 2017.1

    Language:Japanese  

    Venue:岡山コンベンションセンター(岡山県岡山市)   Country:Japan  

  • ジルコン酸ナトリウムランタンセラミックスの作製と電気的特性

    豊村 直人, 長谷川 丈二, 稲田 幹, 林 克郎

    第55回セラミックス基礎科学討論会  2017.1 

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    Event date: 2017.1

    Language:Japanese  

    Venue:岡山コンベンションセンター(岡山県岡山市)   Country:Japan  

  • ビーズミルによるNa2FeP2O7の結晶性と充放電特性への影響

    竹中 匠, 稲田 幹, 長谷川 丈二, 榎本 尚也, 林 克郎

    第55回セラミックス基礎科学討論会  2017.1 

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    Event date: 2017.1

    Language:Japanese  

    Venue:岡山コンベンションセンター(岡山県岡山市)   Country:Japan  

  • MAX相化合物を前駆体とした硫黄/炭素複合材料の合成およびNaイオン電池における充放電挙動の評価

    河原 圭, 稲田 幹, 長谷川 丈二, 榎本 尚也, 林 克郎

    第55回セラミックス基礎科学討論会  2017.1 

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    Event date: 2017.1

    Language:Japanese  

    Venue:岡山コンベンションセンター(岡山県岡山市)   Country:Japan  

  • 焼結助剤によるテープキャストNASICON膜の緻密化

    大久保 圭祐, 稲田 幹, 長谷川 丈二, 榎本 尚也, 林 克郎

    第55回セラミックス基礎科学討論会  2017.1 

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    Event date: 2017.1

    Language:Japanese  

    Venue:岡山コンベンションセンター(岡山県岡山市)   Country:Japan  

  • 酸化物ホスト中のヒドリド(H-)イオンの化学

    林 克郎

    第10回物性科学領域横断研究会(複合合同研究会)  2016.12 

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    Event date: 2016.12

    Language:Japanese  

    Venue:神戸大学百年記念会館六甲ホール(神戸市灘区)   Country:Japan  

  • ナノポーラス結晶12SrO・7Al2O3エレクトライドの電子濃度の定量と熱電子放出特性

    西見 和真, 稲田 幹, 榎本 尚也, 林 克郎

    第6回CSJ化学フェスタ2016  2016.11 

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    Event date: 2016.11

    Language:Japanese  

    Venue:タワーホール船堀(東京都江戸川区)   Country:Japan  

  • 水熱炭化カーボンスフィアのアルカリ賦活による細孔構造変化とキャパシタ特性

    稲田 幹, 岡崎 亮太, 榎本 尚也, 林 克郎

    第30回日本吸着学会研究発表会  2016.11 

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    Event date: 2016.11

    Language:Japanese  

    Venue:長崎大学中部講堂(長崎県長崎市)   Country:Japan  

  • NASICONセラミックス-固体金属Na界面の輸送特性

    内田 康博, 稲田 幹, 榎本 尚也, 林 克郎

    平成28年度九州支部秋季合同研究発表会  2016.11 

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    Event date: 2016.11

    Language:Japanese  

    Venue:長崎大学文教キャンパススカイホール(長崎県長崎市)   Country:Japan  

  • 酸化チタンのアセトアルデヒドに対する吸着・光分解特性の速度論的解析

    松川 祐子, 平田 伸吾, 稲田 幹, 榎本 尚也, 林 克郎

    第29回秋季シンポジウム  2016.9 

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    Event date: 2016.9

    Language:Japanese  

    Venue:広島大学東広島キャンパス(広島県東広島市)   Country:Japan  

  • 正方晶BaTiO3マイクロオーダー単結晶ロッドの水熱合成

    倉田 真志, 稲田 幹, 榎本 尚也, 林 克郎

    第29回秋季シンポジウム  2016.9 

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    Event date: 2016.9

    Language:Japanese  

    Venue:広島大学東広島キャンパス(広島県東広島市)   Country:Japan  

  • 複合アニオン化合物の解析 Invited

    林 克郎

    第1回公開シンポジウム(キックオフミーティング) 複合アニオン化合物の創製と新機能  2016.8 

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    Event date: 2016.8

    Language:Japanese  

    Venue:京都大学桂キャンパス ローム記念館大ホール(京都府京都市)   Country:Japan  

  • 超音波を用いたTiO2-SiO2複合粒子の合成と色素増感太陽電池

    田中 萌子, 稲田 幹, 榎本 尚也, 林 克郎

    第6回九州若手セラミックフォーラム(KYCF-6)&第6回窯業基礎九州懇話会  2016.8 

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    Event date: 2016.8 - 2016.10

    Language:Japanese  

    Venue:ルートイングランティア大宰府(福岡県大宰府市)   Country:Japan  

  • NASICONセラミックス分離型ナトリウム-空気電池 Invited

    林 克郎

    第6回九州若手セラミックフォーラム(KYCF-6)&第6回窯業基礎九州懇話会  2016.8 

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    Event date: 2016.8

    Language:Japanese  

    Venue:ルートイングランティア大宰府(福岡県大宰府市)   Country:Japan  

  • 超音波化学によるセラミック微粒子合成 Invited

    榎本 尚也

    精密工学会第6回定期講習会  2016.7 

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    Event date: 2016.7

    Language:Japanese  

    Venue:埼玉大学工学部(埼玉県さいたま市)   Country:Japan  

  • Alkaline activation for the enhancement of capacitive property of carbon spheres synthesized by hydrothermal carbonization process International conference

    HTC NC-9&GFMAT2016  2016.6 

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    Event date: 2016.6 - 2016.7

    Language:English  

    Country:Canada  

  • Kinetic approach for the adsorption-photodesomposition properties of mesoporous silica-titania Invited International conference

    HTC NC-9&GFMAT2016  2016.6 

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    Event date: 2016.6 - 2016.7

    Language:English  

    Country:Canada  

  • 正方晶チタン酸バリウム針状結晶の水熱合成

    稲田 幹, 倉田 真志, 榎本 尚也, 林 克郎

    粉体工学会 2016年度春期研究発表会  2016.5 

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    Event date: 2016.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都リサーチパーク(京都府)   Country:Japan  

  • C12A7微粒子の液相合成とエレクトライド化

    守谷静香, 稲田 幹, 榎本 尚也, 林 克郎

    日本セラミックス協会2016年年会  2016.3 

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    Event date: 2016.3

    Language:Japanese  

    Venue:早稲田大学西早稲田キャンパス(東京都)   Country:Japan  

  • 電気化学抽出による硫黄/炭素複合材料の合成

    河原圭, 稲田 幹, 榎本 尚也, 林 克郎

    日本セラミックス協会2016年年会  2016.3 

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    Event date: 2016.3

    Language:Japanese  

    Venue:早稲田大学西早稲田キャンパス(東京都)   Country:Japan  

  • 水溶液系Na-空気電池の空気電極性能に及ぼすカーボン材料の効果

    井田大達, 林 克郎, 稲田 幹, 榎本 尚也

    第54回セラミックス基礎科学討論会  2016.1 

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    Event date: 2016.1

    Language:Japanese  

    Venue:アバンセ(佐賀県立男女共同参画センター・佐賀県立生涯学習センター)(佐賀市)   Country:Japan  

  • 速度論的アプローチによるメソ多孔質シニカ-チタニアの吸着光合成特性

    平田伸吾, 稲田 幹, 榎本 尚也, 北條 純一, 林 克郎

    第54回セラミックス基礎科学討論会  2016.1 

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    Event date: 2016.1

    Language:Japanese  

    Venue:アバンセ(佐賀県立男女共同参画センター・佐賀県立生涯学習センター)(佐賀市)   Country:Japan  

  • マイクロ波エマルション法による多孔質CeO2-ZrO2球状粒子の開発 Invited

    稲田 幹, 林 克郎, 北條 純一

    第25回日本MRS年次大会  2015.12 

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    Event date: 2015.12

    Language:Japanese  

    Venue:波止場会館(神奈川県横浜市)   Country:Japan  

  • Utilization of abundant elements: from multifunctional calcium aluminate ceramics to sodium-air batteries Invited International conference

    "Kunming University of Science and Technology, PR China (Special Seiner in Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology & Engineering Laboratory for Advanced Batteries and Materials of Yunnan Province Natio  2015.11 

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    Event date: 2015.11

    Language:English  

    Country:China  

  • 多機能12Cao・7Al2O3 セラミックス:水素化物イオンの理解とSr系への展開 Invited

    林 克郎

    平成27年度九州支部秋季合同研究発表会  2015.11 

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    Event date: 2015.11

    Language:Japanese  

    Venue:アバンセ(佐賀県立男女共同参画センター・佐賀県立生涯学習センター)(佐賀市)   Country:Japan  

  • ジルコン酸ナトリウムランタンセラミックスの電気的特性

    豊村直人, 稲田 幹, 榎本 尚也, 林 克郎

    平成27年度九州支部秋季合同研究発表会  2015.11 

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    Event date: 2015.11

    Language:Japanese  

    Venue:アバンセ(佐賀県立男女共同参画センター・佐賀県立生涯学習センター)(佐賀市)   Country:Japan  

  • Capacitive Property of Carbon Spheres Fabricated by Hydrothermal Carbonization Process Invited International conference

    IUMRS-ICAM2015  2015.10 

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    Event date: 2015.10

    Language:Japanese  

    Country:Korea, Republic of  

  • ナノポーラスC12A7系結晶の包接種(エレクトライド、ヒドリド)の欠陥化学と材料機能 Invited

    林 克郎

    第19回稲盛フロンティア研究セミナー  2015.9 

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    Event date: 2015.9

    Language:Japanese  

    Venue:九州大学   Country:Japan  

  • グラファイト状窒素炭素の合成プロセス

    竹中匠, 稲田 幹, 榎本 尚也, 林 克郎

    日本セラミックス協会第28回秋季シンポジウム  2015.9 

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    Event date: 2015.9

    Language:Japanese  

    Venue:富山大学(富山市)   Country:Japan  

  • セラミックス保護型水溶液系および非水系ナトリウム-空気電池におけるナノポーラス金電極の効果

    林 克郎, 橋本 泰樹

    日本セラミックス協会第28回秋季シンポジウム  2015.9 

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    Event date: 2015.9

    Language:Japanese  

    Venue:富山大学(富山市)   Country:Japan  

  • 水熱炭化法により作製したカーボンスフィアの細孔構造とキャパシタ特性

    岡崎亮太, 稲田 幹, 林 克郎

    日本セラミックス協会第28回秋季シンポジウム  2015.9 

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    Event date: 2015.9

    Language:Japanese  

    Venue:富山大学(富山市)   Country:Japan  

  • テープキャスト法によるNASICONメンブレンの作製

    大久保圭祐, 稲田 幹, 榎本 尚也, 林 克郎

    日本セラミックス協会第28回秋季シンポジウム  2015.9 

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    Event date: 2015.9

    Language:Japanese  

    Venue:富山大学(富山市)   Country:Japan  

  • メソ多孔質シリカ/チタニアの吸着・光分解特性

    稲田 幹, 林 克郎, 北條 純一

    日本セラミックス協会第28回秋季シンポジウム  2015.9 

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    Event date: 2015.9

    Language:Japanese  

    Venue:富山大学(富山市)   Country:Japan  

  • 無機水素化物・電子化物 Invited

    林 克郎

    豊田中央研究所講演会  2015.9 

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    Event date: 2015.9

    Language:Japanese  

    Venue:豊田中央研究所(愛知県長久手町)   Country:Japan  

  • プラズマ焼結MAX相を前駆体としたMXene系層状化合物の合成

    河原圭, 稲田 幹, 榎本 尚也, 林 克郎

    第5回九州若手セラミックフォーラム&第45回窯業基礎九州懇話会  2015.9 

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    Event date: 2015.9

    Language:Japanese  

    Venue:通潤山荘(熊本県上益城郡山都町)   Country:Japan  

  • Synthesis of Nanoporous Crystal S12A7 International conference

    The 1st International Symposium for Women Researchers on Advanced Science and Technology conjugated with Seminar for Young Researchers  2015.7 

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    Event date: 2015.7

    Language:English  

    Country:Japan  

  • Aqueous and Nonaqueous Sodium-Air Cells with Ceramic Separator Invited International conference

    I2CNER Institute interest seminar  2015.6 

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    Event date: 2015.6

    Language:English  

    Country:Japan  

  • 層状ペロブスカイトNaRTiO4 (R:希土類)へのF導入による構造歪み制御

    石渕 圭祐, 赤松 寛文, 吉田 傑, 大野 真之, 長谷川 丈二, 林 克郎

    第14回物性科学領域横断研究会  2020.12 

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    Venue:web  

  • セラミックス・セパレータを用いたNa-空気電池およびマイエナイト(C12A7)系およびアパタイト中のヒドリド(H-)イオン

    林 克郎

    東北大学 特別講演会  2014.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学   Country:Japan  

  • 酸化物高速 Na イオン伝導性セラミック・セパレーターを用いた Na-空気電池 Invited

    林 克郎

    LIB オープンラボ第八回講演会  2014.7 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:神奈川大学横浜キャンパス   Country:Japan  

  • ソノプロセスによるアモルファス鉄微粒子の合成と評価

    平田 伸吾・稲田 幹・榎本 尚也・林 克郎

    日本セラミックス協会 第27回秋季シンポジウム 1F23  2014.9 

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    Venue:鹿児島(鹿児島大学)  

  • 結晶パラメータとNMR化学シフトからの水素化物イオンの同定:マイエナイトとアパタイト中の水素

    林 克郎, Peter V. Sushko, 細野 秀雄

    日本セラミックス協会第27回秋季シンポジウム  2014.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鹿児島大学(鹿児島市)   Country:Japan  

  • 針入度試験による高炉水砕スラグ粉末の水硬挙動評価

    井田 大達・稲田 幹・榎本 尚也・林 克郎・岡本 隆・篠崎 晴彦

    日本セラミックス協会 第27回秋季シンポジウム 2H19  2014.9 

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    Venue:鹿児島(鹿児島大学)  

  • 放電プラズマ焼結 (Spark Plasma Sintering)法による結晶配向性Na-b"-アルミナの作製

    小金井 寿人, 小山 俊久, 林 克郎

    日本セラミックス協会第27回秋季シンポジウム  2014.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鹿児島大学(鹿児島市)   Country:Japan  

  • ナノポーラス金電極とNASICONセラミックスセパレータを用いた ナトリウム-空気電池

    橋本 泰樹, 林 克郎

    日本セラミックス協会第27回秋季シンポジウム  2014.9 

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    Venue:鹿児島大学(鹿児島市)   Country:Japan  

  • 水熱炭化法によるカーボンスフィアの構造とキャパシタ特性

    稲田 幹・新谷 俊介・榎本 尚也・北條 純一・林 克郎

    日本セラミックス協会 第27回秋季シンポジウム 3G05  2014.9 

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    Venue:鹿児島(鹿児島大学)  

  • メソポーラスシリカ-チタニアのアセトアルデヒド吸着・光分解特性評価

    平田伸吾、稲田幹、榎本尚也、北條純一、林克郎

    第4回九州若手セラミックフォーラム(KYCF)&第44回窯業基礎九州懇話会, P-05  2014.9 

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    Venue:長崎  

  • 高炉水砕スラグ粉末の水硬挙動に対する影響因子

    井田大達、稲田幹、榎本尚也、林克郎

    第4回九州若手セラミックフォーラム(KYCF)&第44回窯業基礎九州懇話会, P-01  2014.9 

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    Venue:長崎  

  • 機能性材料としての耐火セラミックス Invited

    林 克郎

    九州工業大学 特別講演会  2014.10 

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    Country:Japan  

    耐火酸化物には厳しい熱化学環境下に耐えるという際立った「機能」から、新しい機能材料として展開が期待できる。当初は典型的な耐火物として取り扱われたきた酸化物材料に関連する、講演者が近年取り組んだ二つの研究について紹介する。
    (1)12CaO・7Al2O3(C12A7) 化合物中の水素
    C12A7は、結晶格子中の籠構造に種々の陰イオンを取り込むことを特徴としており、付随して様々な機能性が示されてきた。元来アルミナセメントの一構成成分として知られていた。例えば、強還元処理によって水素化物(H-)イオンを取り込んだC12A7は、紫外光照射による電子伝導性を発現する。H-イオンの汎用的な評価法はなかなか得難かったが、最近になって、講演者らは一般的な固体NMRに基づく有効な検出評価法を確立することができた。実際この方法論を適用して、アパタイト中に生成させたH-イオンを初めて証明することができた。ゆえに本手法は新材料中のH-イオンを検出法として有効である。
    (2)高速ナトリウムイオン伝導性セラミックスによる新型電池
    Na-S電池は350℃程度で運転される、高エネルギー密度・高耐久性を特徴とするの定置型蓄電池である。ここでは元来耐火物として認識されていたβ-アルミナを、Na+イオンを透過する電解質として用いている。近年、リチウム-空気電池が次世代蓄電池の候補として注目を浴びている。講演者らはリチウム-空気電池の抱えるいくつかの問題を、β-アルミナのような固体電解質を用いることで解決できると考え、セラミックス保護型の「ナトリウム-空気電池」を提案し検討を行っている。その意義と取り組みについて紹介する。

  • ソノケミストリーでアモルファス鉄は作れるか?

    榎本尚也、平田伸吾、稲田幹、林克郎

    第23回 ソノケミストリー討論会, A16  2014.10 

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    Venue:秋田市  

  • 高炉水砕スラグ粉末の水硬特性評価

    井田大達、稲田幹、榎本尚也、林克郎

    平成26年度日本セラミックス協会九州支部秋季合同研究発表会, No.02  2014.11 

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    Venue:ウェルとばた 福岡県北九州市戸畑区  

  • チタニア/シリカ複合光触媒のアセトアルデヒド分解特性

    稲田幹、吉川将平、榎本尚也、北條純一、林克郎

    平成26年度日本セラミックス協会九州支部秋季合同研究発表会, No.01  2014.11 

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    Venue:ウェルとばた 福岡県北九州市戸畑区  

  • NASICON セパレータを用いた非水系-水溶液系 Na-空気電池

    林 克郎, 橋本 泰樹, 梁 風

    第55回電池討論会, 2F27  2014.11 

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    Venue:国立京都国際会館  

  • ビーズミルプロセスによるハイドロキシアパタイトナノ粒子の作製と評価

    川地麻里奈、林克郎、榎本尚也、稲田幹、松本広重

    第53回セラミックス基礎科学討論会, 2E19  2015.1 

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    Venue:京都テルサ  

  • チタニア-シリカ複合多孔体の組成と光触媒能

    吉川将平、稲田幹、榎本尚也、北條純一、林克郎

    第53回セラミックス基礎科学討論会, 2A13  2015.1 

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    Venue:京都テルサ  

  • Structural Analysis of Carbon Spheres Synthesized by Hydrothermal Carbonization Process and its Capacitive Property Invited International conference

    M. Inada, J. Hojo, K. Hayashi

    EMN MEETING on CERAMICS 2015  2015.1 

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    Country:Japan  

  • ゾル-ゲルプロセスによる非晶質リン酸チタン固体電解質の作製と物性評価

    藤原しおり、林克郎、榎本尚也、稲田幹、松本広重

    第53回セラミックス基礎科学討論会, 1G05  2015.1 

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    Venue:京都テルサ  

  • 水溶液系 Na-空気電池に向けたカーボン材料の検討

    井田大達・稲田幹・榎本尚也・林克郎

    日本セラミックス協会2015年年会, 2E33  2015.3 

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    Venue:岡山大学  

  • テンプレートの抽出除去によるメソポーラスシリカ―チタニアの構造調査

    平田伸吾・稲田幹・榎本尚也・北條純一・林克郎

    日本セラミックス協会2015年年会, 2G28  2015.3 

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    Venue:岡山大学  

  • 還元ブルッカイト型二酸化チタンの作製と光触媒特性評価

    松川 祐子, 稲田 幹, 長谷川 丈二, 赤松 寛文, 榎本 尚也, 林 克郎

    複合アニオンキックオフミーティング(2017年5月)  2017.5 

  • Ti3C2 MXeneの昇温脱離挙動と新規窒化物材料の生成

    西見 和真, 長谷川 丈二, 稲田 幹, 赤松 寛文, 林 克郎

    複合アニオンキックオフミーティング(2017年5月)  2017.5 

  • 還元型TiO2(B)の合成

    田中 萌子, 長谷川 丈二, 稲田 幹, 赤松 寛文, 林 克郎

    複合アニオンキックオフミーティング(2017年5月)  2017.5 

  • エチレングリーコール添加水熱合成BaTiO3結晶中の水酸化物イオン

    倉田 真志, 稲田 幹, 長谷川 丈二, 赤松 寛文, 林 克郎

    複合アニオンキックオフミーティング(2017年5月)  2017.5 

  • 表面官能基制御を目指したMXeneへの遷移金属元素ドーピング

    嶋 一成,長谷川 丈二,稲田 幹,赤松 寛文、林 克郎

    複合アニオンキックオフミーティング(2017年5月)  2017.5 

  • Na-Ambient Air Cells with Aqueous Catholyte and NASICON Ceramics-Protected Anode

    Katsuro Hayashi, He Wang, George Hasegawa, Feng Liang

    21st International conference on solid state ionics (SSI-21)  2017.6 

  • Low Temperature Densification of NASICON Ceramics Promoted by Na2O-Nb2O5-P2O5 Glass Additive

    He Wang, Keisuke Okubo, George Hasegawa, Miki Inada, Naoya Enomoto, Katsuro Hayashi

    21st International conference on solid state ionics (SSI-21)  2017.6 

  • Synthesis and Electrical Properties of La2/3-x/3NaxZrO3 with Perovskite Structure

    21st International conference on solid state ionics (SSI-21)  2017.6 

  • 非水系反応によるコバルト硫化物ナノ粒子の形態制御

    松川 祐子, 長谷川 丈二, 赤松 寛文, 林 克郎

    複合アニオントピカル会議(2017年8月)  2017.8 

  • 固相還元処理した電子ドープTiO2(B)

    田中 萌子, 長谷川 丈二, 稲田 幹, 赤松 寛文, 林 克郎

    複合アニオントピカル会議(2017年8月)  2017.8 

  • エチレングリコール添加水熱合成BaTiO3結晶中の水酸化物イオン(2)

    倉田 真志, 稲田 幹, 長谷川 丈二, 赤松 寛文, 林 克郎

    複合アニオントピカル会議(2017年8月)  2017.8 

  • 金属炭化物ナノシートMXeneへの遷移金属ドーピングと表面官能基制御

    嶋 一成,長谷川 丈二,稲田 幹,赤松 寛文、林 克郎

    複合アニオントピカル会議(2017年8月)  2017.8 

  • 水熱合成正方晶 BaTiO3 結晶中の水酸化物イオン

    倉田 真志, 稲田 幹, 長谷川 丈二, 赤松 寛文, 林 克郎, 前園 涼, 本郷 研太

    日本セラミックス協会第30回秋季シンポジウム  2017.9 

  • NASICON/固体金属Na界面の輸送特性

    内田 康博, 長谷川 丈二, 稲田 幹, 赤松 寛文, 林 克郎

    日本セラミックス協会第30回秋季シンポジウム  2017.9 

  • W をドープした Ti3AlC2の作製と金属炭化物ナノシートへの転換

    嶋 一成,長谷川 丈二,稲田 幹,赤松 寛文、林 克郎

    日本セラミックス協会第30回秋季シンポジウム  2017.9 

  • 液相合成TiO2(B)の低温還元

    田中 萌子, 長谷川 丈二, 稲田 幹, 赤松 寛文, 林 克郎

    日本セラミックス協会第30回秋季シンポジウム  2017.9 

  • Hydride ion doping into BaZr0.9Y0.1O3-d

    The 6th Toyota RIKEN International Workshop 2017  2017.11 

  • 水素化物ドーピングとNMRによる水素化物イオン識別

    林 克郎

    東工大元素戦略拠点シンポジウム  2017.11 

  • Mg(BF4)2系電解液中での Mg 電析反応の電極基板依存性

    田中 萌子, 長谷川 丈二, 赤松 寛文, 林 克郎

    第58回電池討論会  2017.11 

  • Kinetic Analysis of Adsorption and Photodecomposition Processes on TiO2 Particles with Different Crystalline Phases

    Yuko MATSUKAWA, Miki INADA, George HASEGAWA, Hirofumi AKAMATSU, Naoya ENOMOYO, Katsuro HAYASHI

    The 34th International Japan-Korea Seminar on Ceramics  2017.11 

  • シート状化合物 Ti3C2Tx を前駆体とした特異構造を有する窒化チタンの作製

    西見 和真, 長谷川 丈二, 赤松 寛文, 林 克郎

    第56回セラミックス基礎科学討論会  2018.1 

  • MXene由来シート状炭窒化チタンの生成&ペロブスカイト系酸水素化物

    林 克郎

    第 3 回新学術領域「複合アニオン」公開シンポジウム  2018.1 

  • 液相法を用いたコバルト硫化物ナノ粒子の作製

    松川 祐子、長谷川 丈二、赤松 寛文、林 克郎

    日本セラミックス協会2018年年会  2018.3 

  • 階層的多孔構造を有するフェノール樹脂の細孔構造制御と炭素化

    矢野 貴也, 長谷川 丈二, 赤松 寛文, 林 克郎

    日本ゾル-ゲル学会第16回討論会  2018.8 

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    Venue:関西大学千里山キャンパス100周年記念会館  

  • Mg二次電池用NASICON系複合アニオン正極材料の探索

    佐々木 直哉, 秋山 優斗, 長谷川 丈二, 赤松 寛文, 林 克郎

    新学術複合アニオン第4回若手スクール  2018.8 

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    Venue:北陸先端科学技術大学院大学  

  • 層状ペロブスカイトCa3Ti2O7への水素化物イオンドーピング

    岸本 和久 赤松 寛文 長谷川 丈二 林 克郎

    新学術複合アニオン第4回若手スクール  2018.8 

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    Venue:北陸先端科学技術大学院大学  

  • Dion-Jacobson型層状ペロブスカイト(Rb, Cs)NdNb2O7の構造と誘電特性

    麻木 宗太, 赤松 寛文, 長谷川 丈二, 林 克郎

    セラミックス協会第31回秋季シンポジウム  2018.9 

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    Venue:名古屋工業大学  

  • クエン酸ゲル前駆体からのNASICON型化合物/カーボン複合体の作製とその電気化学特性評価

    秋山 優斗, 長谷川 丈二, 赤松 寛文, 林 克郎

    セラミックス協会第31回秋季シンポジウム  2018.9 

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    Venue:名古屋工業大学  

  • BaSnO3 系ペロブスカイトへの水素化物イオンドーピング

    渡部 寛, 長谷川 丈二, 赤松 寛文, 林 克郎

    セラミックス協会第31回秋季シンポジウム  2018.9 

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    Venue:名古屋工業大学  

  • SPS 配向 Ti3AlC2 を用いた配向 MXene の生成

    鶴野 伸嘉, 嶋 一成, 長谷川 丈二, 赤松 寛文, 林 克郎

    セラミックス協会第31回秋季シンポジウム  2018.9 

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    Venue:名古屋工業大学  

  • 第一原理計算による新規層状ペロブスカイト酸窒化物強誘電体の探索

    白井 佑弥, 赤松 寛文, 長谷川 丈二, 林 克郎

    セラミックス協会第31回秋季シンポジウム  2018.9 

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    Venue:名古屋工業大学  

  • High concentration of Sn2+ in reduced BaSn1-xYxO3-x/2

    Hiroshi Watanabe,George Hasegawa, Hirofumi Akamatsu, Kotaro Fujii, Masatomo Yashima, Miki Inada, Katsuro Hayashi

    5th SCI workshop  2018.9 

  • Exploration of novel ferroelectric layered perovskite oxides by first-principles calculations

    Yuya Shirai, Hirofumi Akamatsu, George Hasegawa, Katsuro Hayashi

    5th SCI workshop  2018.9 

  • Self-Standing Na3V2(PO4)3 Ceramic Sheet Prepared with Sintering Aid of Na2O-Nb2O5-P2O5 Glass for All Solid State Battery

    He Wang, George Hasegawa, Yuto Akiyama, Hirofumi Akamatsu, Miki Inada, Katsuro Hayashi

    5th SCI workshop  2018.9 

  • 層状MAX相炭化物Ti2SC由来S/C複合材料の化学構造解析

    長谷川 丈二, 河原 圭,嶋 一成, 林 克郎

    第45回炭素材料学会年会  2018.12 

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    Venue:名古屋工業大学  

  • Preparation and Electrochemical Properties of Na3V2(PO4)3 Ceramic Sheet

    He Wang, George Hasegawa, Yuto Akiyama, Hirofumi Akamatsu, Katsuro Hayashi

    2018.12 

  • 密度半関数理論によるルドルスデン-ポッパー層状酸化物強誘電体の探索

    白井 佑弥

    第28回日本MRS年次大会  2018.12 

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    Venue:北九州国際会議場  

  • Na+イオン二次電池用NASICON型複合アニオン正極材料の探索

    佐々木 直哉, 長谷川 丈二, 赤松 寛文, 林 克郎

    新学術複合アニオン第5回若手スクール  2019.1 

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    Venue:関西セミナーハウス  

  • ニオブ酸リチウム構造をもつLiMF3(M = Fe, Co)のトポケミカル合成

    北角 将晃, 赤松 寛文, 長谷川 丈二, 林 克郎

    新学術複合アニオン第5回若手スクール  2019.1 

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    Venue:関西セミナーハウス  

  • Binder-free monolithic electrodes of hierarchically porous carbon embedded with Si nanoparticles for rechargeable Li-ion battery anodes

    G. Hasegawa, K. Hayashi

    6th International Conference on Multifunctional, Hybrid and Nanomaterials  2019.3 

  • Ru-loaded mesoporous C12A7 mesocrystalline microcubes for catalytic NH3 synthesis under ambient pressure

    G. Hasegawa, S. Moriya, M. Kitano, K. Hayashi

    6th International Conference on Multifunctional, Hybrid and Nanomaterials  2019.3 

  • 水熱法による層状リン酸ニオブ化合物の合成と剥離

    吉田 雄一郎, 長谷川 丈二, 赤松 寛文, 林 克郎

    セラミックス協会2019年年会  2019.3 

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    Venue:工学院大学新宿キャンパス  

  • 層状ペロブスカイト Ca3Ti2O7への水素化物イオンドーピング

    岸本 和久, 赤松 寛文, 長谷川 丈二, 林 克郎

    セラミックス協会2019年年会  2019.3 

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    Venue:工学院大学新宿キャンパス  

  • Preparation of Crystalline Na3V2(PO4)3 by Glass-Ceramic Process

    Sai Niu, Hirofumi Akamatsu, Yuto Akiyama, George Hasegawa, Katsuro Hayashi

    2019.3 

  • チオール化合物を硫黄源とする硫化コバルトナノ粒子の作製

    松川 祐子, 長谷川 丈二, 赤松 寛文, 林 克郎

    新学術複合アニオン第6回若手スクール  2019.5 

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    Venue:北海道大学フロンティア応用科学研究棟  

  • 水熱法による層状リン酸ニオブ化合物の合成と剥離

    吉田 雄一郎, 長谷川 丈二, 赤松 寛文, 林 克郎

    新学術複合アニオン第6回若手スクール  2019.5 

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    Venue:北海道大学フロンティア応用科学研究棟  

  • 結晶相転移誘起相分離を利用した多孔質メソクリスタルの作製

    大田黒 光, 長谷川 丈二, 赤松 寛文, 林 克郎

    新学術複合アニオン第6回若手スクール  2019.5 

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    Venue:北海道大学フロンティア応用科学研究棟  

  • 単純ペロブスカイト BaM1?xYxO3?x/2 (M=Zr,Sn,Ce)における固相還元の効果

    小川 雄也, 林 克郎, 長谷川 丈二, 赤松 寛文, 渡部 寛, 藤井 孝太郎, 八島 正知, 松石 聡

    新学術複合アニオン第6回若手スクール  2019.5 

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    Venue:北海道大学フロンティア応用科学研究棟  

  • Ordered Mesoporous Carbon Nanorod Assemblies as a Binder-free Monolithic Electrode for Na-ion Batteries

    George Hasegawa

    E-MRS 2019 Spring Meeting  2019.5 

  • Hydride ions and oxygen vacancies in severely-reduced primitive cubic perovskites

    Katsuro Hayashi, Hiroshi Watanabe, Hirofumi Akamatsu, George Hasegawa

    E-MRS 2019 Spring Meeting  2019.5 

  • Titanium Carbonitride Nanoflakes Converted from MXene by Nitrogen Gas Annealing

    K. Hayashi, K. Nishimi, N. Tsuruno, K. Kimoto, G. Hasegawa, M. Inada

    GFMAT-2&Bio-4  2019.7 

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    Language:English  

    Country:Japan  

  • ハイドロガーネットを前駆体としたメソポラスSrFeOxの作成

    大田黒 光, 長谷川 丈二, 赤松 博文, 林 克郎

    日本ゾル-ゲル学会第17回討論会  2019.8 

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    Venue:東京理科大学 葛飾キャンパス 図書館ホール  

  • 革新電池むけに見直される酸化物系ナトリウムイオン伝導体

    林 克郎

    九州大学-昭栄化学工業株式会社 2019 年度第1 回研究交流会  2019.8 

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    Venue:JR 博多シティ会議室 9F 会議室 2  

  • Synthesis of Mesoporous SrFeOx Particles from Hydrogarnet Precursor

    Hikaru Otaguro, George Hasegawa, Hirofumi Akamatsu, Katsuro Hayashi

    PACRIM13  2019.10 

  • Metal-Hydride Reduction of Primitive Perovskites BaM1?xYxO3?x/2 (M = Zr, Sn, Ce)

    Yuya Ogawa, George Hasegawa, Hirofumi Akamatsu, Kotaro Fujii, Masatomo Yashima, Miki Inada, Satoru Matsuishi, Katsuro Hayashi

    PACRIM13  2019.10 

  • Electrical Conductivity of OlivineType MgMSiO4

    Nanami Ikeda, George Hasegawa, Hirofumi Akamatsu, Katsuro Hayashi

    PACRIM13  2019.10 

  • Preparation of Oxide-Based Na Ion Battery by Tape-Casting Laminate NASICON-type Ceramics

    Takehiro Kashihara, George Hasegawa, Hirofumi Akamatsu, Katsuro Hayashi

    PACRIM13  2019.10 

  • Fabrication of NASICON-type All-Solid-State Sodium-Ion Batteries

    Naoya Sasaki, George Hasegawa, Hirofumi Akamatsu, Katsuro Hayashi

    PACRIM13  2019.10 

  • Synthesis and Physical Properties of Carrier-doped Layered Perovskite Ca3Ti2O7

    Kazuhisa Kishimoto, Hirofumi Akamatsu, George Hasegawa, Katsuro Hayashi

    PACRIM13  2019.10 

  • Topochemical Synthesis and Structural Analysis of Lithium Niobate-Type Fluorides

    Masahiro Kitakado, Hirofumi Akamatsu, George Hasegawa, Katsuro Hayashi

    PACRIM13  2019.10 

  • Hydrothermal Synthesis of layered Niobium Phosphates and delaminated

    Yuichiro Yoshida, George Hasegawa, Hirofumi Akamatsu, Katsuro Hayashi

    PACRIM13  2019.10 

  • Synthesis, Morphology and Crystallography of Cobalt Thiolates Nanoparticles

    Yuko Matsukawa, George Hasegawa, Hirofumi Akamatsu, Katsuro Hayashi

    PACRIM13  2019.10 

  • Crystalline Na3V2(PO4)3 Cathode Material Prepared by Glass-Ceramic Process

    Sai Niu, Hirofumi Akamatsu, Yuto Akiyama, George Hasegawa, Katsuro Hayashi

    PACRIM13  2019.10 

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    Language:English  

    Country:Japan  

  • Defect Chemistry of Metal Hydride Agent-Reduced Simple Perovskites

    Katsuro HAYASHI

    PACRIM13  2019.10 

  • 遷移金属チオラートを前駆体とする硫化物ナノ粒子の作製

    松川 祐子, 長谷川 丈二, 赤松 寛文, 林 克郎

    新学術複合アニオン第8回若手スクール  2020.1 

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    Venue:物質・材料研究機構 並木地区  

  • スピノーダル分解を利用した共連続ポリイミドゲルの作製と低密度化

    指山 雄太郎, 長谷川 丈二, 赤松 寛文, 林 克郎

    新学術複合アニオン第8回若手スクール  2020.1 

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    Venue:物質・材料研究機構 並木地区  

  • 単純ペロブスカイトBaM1-xYxO3-x/2 (M = Zr, Sn, Ce)における固相還元の効果

    小川 雄也, 長谷川 丈二, 赤松 寛文, 藤井 孝太郎, 八島 正知, 林 克郎

    新学術複合アニオン第8回若手スクール  2020.1 

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    Venue:物質・材料研究機構 並木地区  

  • テープキャスト膜共焼成全ナシコン系ナトリウムイオン電池の作成

    柏原 健宏, 赤松 寛文, 林 克郎

    セラミックス協会2020年年会  2020.3 

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    Venue:明治大学 駿河台キャンパス  

  • SPS 法によるオリビン型 Mg 系正極材料の作製と電気特性評価

    池田 七海, 林 克郎, 赤松 寛文, (名古屋大学) 長谷川 丈二

    セラミックス協会2020年年会  2020.3 

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    Venue:明治大学 駿河台キャンパス  

  • ニッケルチオラートを前駆体とする硫化ニッケルナノ粒子の作製

    松川 祐子, (名古屋大学) 長谷川 丈二, (九州大学) 赤松 寛文, 大谷 亮, 林 克郎

    セラミックス協会2020年年会  2020.3 

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    Venue:明治大学 駿河台キャンパス  

  • 熱分解誘起相分離を利用した多孔質 SrFeO3?δ 多面体粒子の作製

    大田黒 光, 林 克郎, 赤松 寛文, (名古屋大学) 長 谷川 丈二

    セラミックス協会2020年年会  2020.3 

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    Venue:明治大学 駿河台キャンパス  

  • Dion-Jacobson相(Rb,Cs)NdNb2O7の構造相転移と誘電特性

    赤松 寛文, 麻木 宗太, 長谷川 丈二, 林 克郎

    第37回強誘電体会議  2020.5 

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    Venue:中止(みなし発表)  

  • Na系全固体スーパーキャパシタにむけた多孔質電解質-カーボン複合電極の作製

    片岡 菜々子, (名古屋大学)長谷川 丈二, 赤松 寛文, 林 克郎

    第9回JACIGSCシンポジウム  2020.6 

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    Venue:web  

  • NVPおよびNTP電極緻密膜を用いた混合伝導性評価

    福本 太一, (名古屋大学)長谷川 丈二, 柏原 健宏, 赤松 寛文,

    第9回JACIGSCシンポジウム  2020.6 

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    Language:Japanese  

    Venue:web  

  • 多孔質SrFeO3-δ粒子の作成と酸素放出剤への応用

    大田黒 光, 林 克郎, 赤松 寛文, (名古屋大学) 長 谷川 丈二

    第33回秋季シンポジウム  2020.9 

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    Venue:web  

  • SPS法によるオリビン型Mgイオン系正極材料の作成と伝導特性評価

    池田 七海, 林 克郎, 赤松 寛文, (名古屋大学) 長谷川 丈二

    第33回秋季シンポジウム  2020.9 

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    Venue:web  

  • 単純ペロブスカイトBaM1-xYxO3-x/2(M=Zr, Sn, Ce)における固相還元の効果

    小川 雄也, 渡辺 寛, (名古屋大学)長谷川 丈二, (九州大学)赤松 寛文, (東京工業大学)藤井 孝太郎, 八島 正知, (九州大学)稲田 幹, (東京工業大学)松石 聡, (九州大学) 林 克郎

    第33回秋季シンポジウム  2020.9 

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    Venue:web  

  • テープキャスト膜積層ナシコン系全固体ナトリウムイオン電池の作成

    柏原 健宏, 赤松 寛文, 林 克郎, (名古屋大学)長谷川 丈二

    第33回秋季シンポジウム  2020.9 

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    Venue:web  

  • スピノーダル分解型総分離を伴うゾルゲル法を利用した共連続ポリイミドゲルの作成

    指山 雄太郎, 赤松 寛文, 林 克郎, (名古屋大学)長谷川 丈二

    第33回秋季シンポジウム  2020.9 

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    Venue:web  

  • Niフェニルメタンチオラートの熱分解によるNi硫化物の生成

    松川 祐子, (名古屋大学) 長谷川 丈二, (九州大学) 赤 松 寛文, 大谷 亮, 林 克郎

    第33回秋季シンポジウム  2020.9 

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    Venue:web  

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MISC

  • セラミック・ナトリウム電池の開発 酸化物系全個体電池に向けた汎用的ナシコン系電極膜形成 Reviewed

    林克郎

    クリーンエネルギー Vol.32,No,6 日本工業出版   2023.6

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  • 驚異の3族金属酸水素化物

    林 克郎

    2022.10

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  • モノリス型多孔質電極を用いた非晶質カーボンの電気化学特性評価 (Studies on Electrochemical Properties of Amorphous Carbons by Monolithic Porous Electrodes) Reviewed

    長谷川 丈二

    2019.9

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  • 次世代電池にむけて再注目される酸化物系ナトリウムイオン伝導体

    林 克郎

    2019.8

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  • 【論文紹介記事】複合アニオン化による無機結晶の新展開 Reviewed

    長谷川 丈二

    2019.3

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  • 第3章:蓄電デバイス用炭素の進展-フェノール樹脂由来ハードカーボンのナトリウムイオン吸蔵特性 Reviewed

    長谷川 丈二, 安部 武志

    2018.10

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    Language:Japanese  

  • 複合アニオン化合物の構造解析 Reviewed

    八島 正知、林 克郎、木本 浩司

    日本金属学会誌   2018.5

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    <p>Recently mixed-anion compounds such as metal oxynitrides have attracted considerable attention in physics, chemistry and materials science. In the present brief review, we describe the structural analyses of the mixed-anion compounds. X-ray and neutron diffractometry is able to refine the crystallographic parameters of the crystalline mixed-anion compounds. Electron-density from X-ray data and neutron-scattering-length-densities from neutron data can give the information on the chemical bonding and structural disordering. Scanning transmission electron microscopy and electron energy-loss spectroscopy allow us to characterize local crystal structures with high spatial resolution. Combination of the information about local structures by X-ray absorption near edge structure and magic angle spinning-nuclear magnetic resonance with those available by the diffraction techniques is effective to tackle the problems peculiar to the mixed anion systems: discrimination of N3-, O2-, and F, and H and OH.</p>

    DOI: 10.5940/jcrsj.60.254

  • 第4章 多孔性ポリマーの作製と応用: 4節 多孔性フェノール樹脂の微細構造制御と力学特性 Reviewed

    長谷川 丈二

    2018.3

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    Language:Japanese  

  • アニオン包接マイエナイト系化合物の展開

    林 克郎

    セラミックス   2017.12

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  • ナトリウムイオン伝導体β"-アルミナおよびNASICONの緻密化

    林 克郎

    技術情報協会 全固体電池のイオン伝導性向上技術と材料、製造プロセスの開発   2017.6

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  • 超音波による有機化合物からのナノ構造体作成

    榎本 尚也, 稲田 幹, 北條 純一, 林 克郎

    超音波   2014.4

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  • マイエナイトおよびアパタイト結晶中のH-イオン

    林 克郎

    めそん   2014.4

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  • 専門用語の検索Engine 「空気電池」

    林 克郎

    2014.2

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Industrial property rights

Patent   Number of applications: 4   Number of registrations: 3
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

  • The Ceramic Society of Japan

  • The Japan Institute of Metals and Materials

  • The Japan Society fo Applied Physics

  • The Chemical Society of Japan

  • The Solid State Ionics Society of Japan

  • The Electrochemical Society of Japan

  • The American Ceramic Society

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Committee Memberships

  • 九州工学教育協会   監事   Domestic

    2025.3 - 2023.4   

  • 日本工学教育協会   財務委員   Domestic

    2023.7 - 2025.6   

  • Executive   Domestic

    2022.4 - 2023.4   

  • Organizer   Domestic

    2020.4 - 2024.3   

  • 日本セラミックス協会   九州地区支部・幹事   Domestic

    2020.4 - 2024.3   

  • Organizer   Domestic

    2016.1 - 2024.3   

  • 日本セラミックス協会   基礎科学部会 幹事   Domestic

    2016.1 - 2024.3   

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Academic Activities

  • 実行委員

    2023電気化学会秋季大会  ( 九州大学 伊都キャンパス ) 2023.9

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    Type:Competition, symposium, etc. 

    Number of participants:1,000

  • セミナー主催

    九州工学教育協会・第14回九工教シンポジウム・これからの九州の工学教育  ( 福岡市 ) 2023.1

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2023

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:11

  • 実行委員

    第63回電池討論会  ( 福岡国際会議場 ) 2022.11

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    Type:Competition, symposium, etc. 

    Number of participants:1,500

  • セミナー主催

    九州工学教育協会・第13回九工教シンポジウム・九州沖縄地区での産官学連携とDX  ( 福岡市 ) 2022.7

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    Type:Competition, symposium, etc. 

  • オーガナイザーおよび座長 International contribution

    2022.6

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    Type:Competition, symposium, etc. 

  • セッションオーガナイザー International contribution

    ( オンライン ) 2022.5 - 2022.6

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    Type:Competition, symposium, etc. 

    Number of participants:1,500

  • オーガナイザー

    複合アニオンの創成と新機能 最終報告会  ( オンライン ) 2022.3

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    Type:Competition, symposium, etc. 

    Number of participants:100

  • Screening of academic papers

    Role(s): Peer review

    2022

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:22

  • オーガナイザー International contribution

    ( 神戸商工会議所 ) 2021.12

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    Type:Competition, symposium, etc. 

    Number of participants:150

  • Screening of academic papers

    Role(s): Peer review

    2021

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:13

  • Screening of academic papers

    Role(s): Peer review

    2020

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:25

  • 現地実行委員

    第45回固体イオニクス討論会  ( 九州大学椎木講堂 ) 2019.11

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    Type:Competition, symposium, etc. 

  • 実行委員、セッションオーガナイザー International contribution

    ( 沖縄コンベンションセンター ) 2019.10 - 2019.11

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    Type:Competition, symposium, etc. 

    Number of participants:1,200

  • 座長

    日本セラミックス協会2019年年会  ( 工学院大学新宿キャンパス ) 2019.3

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2019

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:13

  • Screening of academic papers

    Role(s): Peer review

    2018

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:12

  • 科学研究費委員会専門委員

    Role(s): Review, evaluation

    独立行政法人日本学術振興会  2017.12 - 2018.11

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    Type:Scientific advice/Review 

  • 座長(Chairmanship)

    日本セラミックス協会第30回秋季シンポジウム  ( 神戸大学 ) 2017.9

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    Type:Competition, symposium, etc. 

  • 開催委員長

    第二回複合アニオン公開シンポジウム キックオフミーティング  ( 九州大学 ) 2017.5

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    Type:Competition, symposium, etc. 

    Number of participants:90

  • 卓越研究員候補者選考委員会/書面審査員

    Role(s): Review, evaluation

    独立行政法人・日本学術振興会  2017.5 - 2017.7

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    Type:Scientific advice/Review 

  • 座長(Chairmanship)

    日本化学会 第97春季年会(2017)  ( 慶應義塾大学 日吉キャンパス ) 2017.3

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    Type:Competition, symposium, etc. 

  • セッションオーガナイザー・座長(Chairmanship) International contribution

    2017.2

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    Type:Competition, symposium, etc. 

    Number of participants:60

  • Academic Committee, Session Organizer International contribution

    The 18th International Symposium on Eco-materials Processing and Design  ( Okinawa Japan ) 2017.2

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    Type:Competition, symposium, etc. 

    Number of participants:274

  • 座長(Chairmanship)

    第55回セラミックス基礎科学討論会  ( 岡山コンベンションセンター ) 2017.1

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2017

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:10

  • 主催 International contribution

    2016.12 - 2017.12

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    Type:Competition, symposium, etc. 

    Number of participants:25

  • 平成29年度科研費 新学術領域研究専門委員

    Role(s): Review, evaluation

    文部科学省  2016.10 - 2017.3

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    Type:Scientific advice/Review 

  • 特別研究員等審査会専門委員及び国際事業委員会書面審査員・書面評価員

    Role(s): Review, evaluation

    独立行政法人・日本学術振興会  2016.8 - 2017.7

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    Type:Scientific advice/Review 

  • 座長(Chairmanship)

    日本セラミックス協会2016年年会  2016.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    第54回セラミックス基礎科学討論会  2016.1

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    Type:Competition, symposium, etc. 

  • セッションオーガナイザー

    第54回セラミックス基礎科学討論会  ( 佐賀市 ) 2016.1

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    Type:Competition, symposium, etc. 

    Number of participants:400

  • セッションオーガナイザー

    公益社団法人日本セラミックス協会第28回秋季シンポジウム  ( 富山大学 ) 2015.9

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    Type:Competition, symposium, etc. 

    Number of participants:800

  • 特別研究員等審査会専門委員及び国際事業委員会書面審査員・書面評価員

    Role(s): Review, evaluation

    独立行政法人日本学術振興会  2015.8 - 2016.7

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    Type:Scientific advice/Review 

  • 年会開催地実行委員

    公益社団法人日本セラミックス協会2013年年会  ( 東京工業大学 大岡山キャンパス ) 2013.3

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    Type:Competition, symposium, etc. 

    Number of participants:1,000

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Research Projects

  • 革新的GX技術創出事業 蓄電池分野 資源制約フリーなナトリウムイオン電池の開発

    2023.10 - 2026.9

    共同研究機関:東北大学,東京大学,東京工業大学,工学院大学,東京理科大学,早稲田大学,北陸先端科学技術大学院大学,名古屋大学,京都大学,兵庫県立大学,山口大学,九州大学,物質・材料研究機構,高エネルギー加速器研究機構,総合科学研究機構,理化学研究所,高輝度光科学研究センター 

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    Authorship:Coinvestigator(s) 

    資源制約のない元素を用いたナトリウムイオン電池の高エネルギー密度化,長寿命化を目標とした開発を行う。
    我が国で初めて実用化されたリチウムイオン電池は、実用蓄電池で最大のエネルギー密度を有するためGX技術の実現に必須の蓄電池である。しかしながら希少・毒性元素が必須であり、リチウム資源が偏在することも相まってリチウム原料の価格は乱高下している。また高コストなコバルト、ニッケル、銅なども必要である。蓄電池の応用範囲が拡大し、地球規模での環境・エネルギー問題の取り組みが重要となる中、地政学リスクと資源制約から開放されたリチウム代替の蓄電池開発は、革新的GX技術における最重要課題のひとつである。本研究開発では、周期表においてリチウムと同族で資源制約のないナトリウムに注目し、日本発のリチウムイオン電池の技術を継承する次世代蓄電池「ナトリウムイオン電池」の社会実装に向けた材料開発と電池設計、機構解析、計算科学研究に取り組む。
    特に、林教授のグループは、ナトリウムイオン電池の特長を引き継いだ酸化物全固体系の蓄電池の開発を担います。

  • 酸化物系全固体ナトリウムイオン電池の構築

    2023 - 2027

    革新的GX技術創出事業(GteX)

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Contract research

  • Laser sintering of micro-macro composite ceramics for additive sintering technology

    Grant number:23K17820  2023 - 2024

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Challenging Research(Exploratory)

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    Authorship:Principal investigator  Grant type:Scientific research funding

    CiNii Research

  • 岩谷科学技術研究助成

    2023

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    Grant type:Donation

  • 酸化物電解質を用いた全固体ナトリウム二次電池の研究開発

    2020 - 2021

    NEDO先導研究プログラム/エネルギー・環境新技術先導研究プログラム

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    Authorship:Coinvestigator(s)  Grant type:Contract research

  • Creation of novel ionics devices by synergetic design of Na-conducting poly-anion compounds

    Grant number:19H00828  2019 - 2022

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Hayashi Katsuro

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    Authorship:Principal investigator  Grant type:Scientific research funding

    We aimed to develop new areas of materials functional design by flexibly converting and/or complexing materials inspired from solid polyanionic compounds containing mobile Na ions, tackling the issues of "What is peculiarity of Na and to what extent is it possible? Outcome includes the topics of: the exploration of Nasicon-based and new Na ion solid electrolytes and their properties, the development of new intercalation materials systems promising for electrode active materials, the development and evaluation of carbon-based electrode materials with high specific surface area, the development of all-solid-state capacitors by compositing carbon materials and Nasicon-based materials, the Nasicon-based electrode materials by glass-ceramic method for bonding of Nasicon-based electrode materials to electrolyte, the thick film formation and interface construction between electrode materials and electrolyte, and the fabrication of oxide-based all-solid-state Na+ ion batteries.

    CiNii Research

  • 新学術領域「新学術領域「複合アニオン化合物の創製と新機能」

    2016.8 - 2021.3

    京都大学 

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    Authorship:Coinvestigator(s) 

    A02「複合アニオン化合物の理解:化学・構造・電子状態解析」複合アニオン化合物は、近年、急速発展している物質群であり、固体化学とその応用分野の革新と「元素戦略」の基軸となるポテンシャルを有しています。しかし、この物質群に対しては、酸化物等を対象とした従来の研究手法が通用せず、その結晶構造を決定するための評価・解析手法すら確立していない状態です。例えば、酸フッ化物(O2--F-)系の複合アニオン化合物ではX 線回折・中性子回折いずれにおいても散乱断面積が近接するため、回折法でアニオン配置が決定できません。また、酸化物中に水素化物イオンH-が安定に存在するという事実は、結晶回折法、固体核磁気共鳴法および理論計算を駆使した研究成果を受けて、最近ようやく常識として認知されるようになりました。
    新物質合成の折には、その「構造」が分からなければ先に進めません。物質機能は、その「状態」が分からなければ、機能発現の起源が分かりません。そこで、本研究班では、複合アニオン化合物の新物質探索と機能開拓の鍵となる、複合アニオン系に固有の構造情報を明らかにし、物質機能の理解と予測に繋げることを目的としています。複合アニオン系に展開することで直面する物質評価の問題をテーラーメードで解決し、手法の汎用化を図り、物質探索の加速を狙います。原子分解能の分析電子顕微鏡法、単結晶回折法と粉末回折法の最新計測法と向度解析に関する第一人者を取りそろえ、迅速な結晶構造決定と、酸素とフッ素の判別問題、混合水素化物、異常原子価のアニオンの検出等に取り組む。放射光X線吸収法、電子エネルギー損失分光法や固体核磁気共鳴法、吸着法、質量分析法等に深い経験を有する研究者が結集し、低次元物質、表面吸着、脱離など動的現象や低結晶性の物質や触媒表面の元素の状態分析に取り組みます。理論計算による襄付けや系統化の手段を取り入れます。また、理論計算の専門家を中心としてA01、03班と本班で蓄積された電気的・磁気的・化学的実験データと理論計算を融合し物性予測を行います。特に、電子状態・熱力学変数・機械特性に加えて、誘電性や熱電性等の格子振動を取り扱う計算負荷の高い解析手法にも対応できる体制を整え、研究項目A03と協同して新奇物性と機能性を発掘します。方法論の汎用化を図り、研究項目A01で創出される新物質の評価を効率化させます。

  • 複合アニオン化合物の創製と新機能に関する研究の国際活動支援

    Grant number:16K21724  2016.6 - 2024.3

    科学研究費助成事業  新学術領域研究(研究領域提案型)

    陰山 洋, 前田 和彦, 荻野 拓, 林 克郎, 八島 正知

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    Grant type:Scientific research funding

    国際活動支援班の「国際共同研究推進委員会」,「相互派遣企画委員会」,「海外施設派遣支援検討委員会」,「レクチャーツアー企画委員会」において,2016~2019年度に各項目を具体的に検討・実行した。各班の代表が,各班の国際共同研究,海外の大型施設利用,国際ネットワーク,支援すべき若手の状況と支援要望を集め,国際活動支援班に集約した。上記4つの支援検討委員会の委員で検討し,海外ハブ研究者の助言や協力を仰ぎながら,計画・公募班の関連メンバーが国際共同研究を推進できるように積極的に支援した。計画班員の組織の若手(若手教員,ポスドク,優秀な学生)を海外機関に派遣し,国際共同研究の推進すると共に,国際性のある若手を育成してきた。特に,海外大型実験施設(中性子,放射光など)への派遣や複数機関への滞在により継続的・発展的なネットワークを構築した。例えば,中性子回折装置を用いて複合アニオン化合物の結晶構造を研究するために,オーストラリア国立原子力科学技術機構へ日本人の若手研究者と優秀な大学院生を派遣した。国外の若手(若手教員,ポスドク,優秀な学生)を計画・公募班の研究室へ派遣し,国際共同研究の推進や日本人海外研究者の帰国支援に活かすと共に,複数機関の滞在によるキャリアパス支援を図った。また計画研究メンバーによるレクチャーツアーを行い,本領域の積極的な情報発信をするとともに,「複合アニオン化合物」の国際的認知度を高めるとともに国際共同研究を積極的に働きかけた。2020年度に続いて2021年度はコロナ禍の影響を受けたため,研究課題の繰越手続きを経て2022年度を迎えることとした。当該年度もコロナ禍の影響を多少受ける形となったが,外国人研究者の受け入れや日本人研究者の派遣を行い,国際共同研究を実施することができた。論文成果についても,学術論文として3報を発表した。

    CiNii Research

  • 複合アニオン化合物の理解:化学・構造・電子状態解析

    Grant number:16H06440  2016 - 2020

    日本学術振興会・文部科学省  科学研究費助成事業  新学術領域研究

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 改変メクセンの創製と空気電池電極への適用

    Grant number:16K14390  2016 - 2017

    科学研究費助成事業  萌芽研究

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • セラミックス分離型金属-空気電池へのセラミックス・金属材料学アプローチ

    2014.4 - 2017.3

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    Authorship:Principal investigator 

  • セラミックス分離型金属-空気電池へのセラミックス・金属材料学アプローチ

    Grant number:26289235  2014 - 2016

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 元素戦略プロジェクト拠点形成型

    2013.10 - 2019.3

    文部科学省 

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    Authorship:Coinvestigator(s) 

  • 複合アニオン化合物の創製と新機能に関する研究の総括

    Grant number:21H00460 

    陰山 洋, 林 克郎, 荻野 拓, 前田 和彦

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    Grant type:Scientific research funding

    我々が複合アニオン化合物の発展に与えた影響は計り知れず、多く国内外で認知された。欧米で類似のプロジェクトが開始される等、世界的にも影響を与えたと自負している。一方新たな学問領域としての複合アニオンは、確立されたとは言い難い。本領域成果は複合アニオンに着目して初めて生れたが、ともすれば各分野専門家が独立に挙げたとされる恐れがある。各学会での複合アニオン関連のセッション等も、高い割合で我々が関係している。複合アニオンの必要性と有用性が認知され新学術領域として確立する為、継続的な啓蒙活動が必要である。また本領域では接点のなかった専門家間の横の繋がりが有機的に機能し、この繋がりは終了後も発展させたい。

    CiNii Research

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Educational Activities

  • Professor Hayashi is in charge of lectures mainly in the field of inorganic chemistry in basic education, undergraduate education, graduate education, and their international courses. Through the activities of the Japan Engineering Education Association and the Kyushu Engineering Education Association, he will also contribute to high school and university education from the perspective of Kyushu, as well as to entrance examinations and curricula in the Faculty of Engineering. As a researcher and educator, He will convey the interest and importance of inorganic materials and ceramics through lectures on traditional ceramics, cutting-edge industrial components and products, related resource and environmental issues, and solid state science combined with high school physics and chemistry in a way that is easy to understand.

Class subject

  • 機能物質化学コロキウム

    2024.4 - 2024.9   First semester

  • 応用化学実験第一

    2023.10 - 2024.3   Second semester

  • グリーンケミストリー

    2023.10 - 2024.3   Second semester

  • 無機固体化学

    2023.10 - 2024.3   Second semester

  • 応用化学実験第三

    2023.10 - 2024.3   Second semester

  • 無機化学第三(地球環境工学科)

    2023.10 - 2023.12   Fall quarter

  • 無機化学第三(応用化学科)

    2023.6 - 2023.8   Summer quarter

  • (IUPE)Inorganic ChemistryⅡ

    2023.6 - 2023.8   Summer quarter

  • 無機物質化学Ⅱ

    2023.6 - 2023.8   Summer quarter

  • 応用無機化学講究

    2023.4 - 2024.3   Full year

  • 応用化学A

    2023.4 - 2023.9   First semester

  • (IUPE)Inorganic ChemistryⅠ

    2023.4 - 2023.6   Spring quarter

  • 応用化学実験第一

    2022.10 - 2023.3   Second semester

  • 専門英語(個別テーマ)

    2022.10 - 2023.3   Second semester

  • 物質科学工学実験第三

    2022.10 - 2023.3   Second semester

  • 物質科学工学実験第一

    2022.10 - 2023.3   Second semester

  • 無機化学第三

    2022.10 - 2022.12   Fall quarter

  • 無機物質化学Ⅱ

    2022.6 - 2022.8   Summer quarter

  • (IUPE)Inorganic ChemistryⅡ

    2022.6 - 2022.8   Summer quarter

  • 応用無機化学講究

    2022.4 - 2023.3   Full year

  • セラミック材料物性学

    2022.4 - 2022.9   First semester

  • セラミック工学

    2022.4 - 2022.9   First semester

  • (IUPE)Inorganic ChemistryⅠ

    2022.4 - 2022.6   Spring quarter

  • 無機固体化学

    2021.10 - 2022.3   Second semester

  • Inorganic Solid State Chemistry

    2021.10 - 2022.3   Second semester

  • 無機化学第三

    2021.10 - 2021.12   Fall quarter

  • 無機物質化学Ⅱ

    2021.6 - 2021.8   Summer quarter

  • (IUPE)Inorganic ChemistryⅡ

    2021.6 - 2021.8   Summer quarter

  • 応用無機化学講究

    2021.4 - 2022.3   Full year

  • 応用無機化学講究

    2021.4 - 2022.3   Full year

  • 無機物質化学Ⅰ

    2021.4 - 2021.6   Spring quarter

  • 無機化学第一

    2021.4 - 2021.6   Spring quarter

  • (IUPE)Inorganic ChemistryⅠ

    2021.4 - 2021.6   Spring quarter

  • 無機材料化学

    2020.10 - 2020.12   Fall quarter

  • 無機化学第三

    2020.10 - 2020.12   Fall quarter

  • (IUPE)Inorganic ChemistryⅡ

    2020.6 - 2020.8   Summer quarter

  • 応用無機化学講究

    2020.4 - 2021.3   Full year

  • セラミック材料物性学

    2020.4 - 2020.9   First semester

  • セラミック工学

    2020.4 - 2020.9   First semester

  • Ceramic Engineering

    2020.4 - 2020.9   First semester

  • 無機物質化学

    2020.4 - 2020.9   First semester

  • 無機化学第一

    2020.4 - 2020.6   Spring quarter

  • (IUPE)Inorganic ChemistryⅠ

    2020.4 - 2020.6   Spring quarter

  • Inorganic Solid State Chemistry

    2019.10 - 2020.3   Second semester

  • 無機固体化学

    2019.10 - 2020.3   Second semester

  • 無機化学第三

    2019.10 - 2019.12   Fall quarter

  • セラミック材料物性学

    2019.4 - 2019.9   First semester

  • 無機物質化学

    2019.4 - 2019.9   First semester

  • 無機化学第一

    2019.4 - 2019.6   Spring quarter

  • (IUPE) Inorganic Chemistry A

    2019.4 - 2019.6   Spring quarter

  • 応用無機化学講究

    2018.4 - 2019.3   Full year

  • 無機材料化学

    2018.4 - 2018.9   First semester

  • 無機化学

    2018.4 - 2018.9   First semester

  • Ceramic Engineering

    2018.4 - 2018.9   First semester

  • 無機化学第三

    2018.4 - 2018.9   First semester

  • セラミック工学

    2018.4 - 2018.9   First semester

  • 無機物質化学

    2018.4 - 2018.9   First semester

  • セラミック材料物性学

    2018.4 - 2018.9   First semester

  • 無機化学第一

    2018.4 - 2018.6   Spring quarter

  • Inorganic Chemistry A

    2018.4 - 2018.6   Spring quarter

  • 物質科学工学実験第一

    2017.10 - 2018.3   Second semester

  • 物質科学工学実験第三

    2017.10 - 2018.3   Second semester

  • 産業活動実習

    2017.10 - 2018.3   Second semester

  • 産学連携特論第一

    2017.10 - 2018.3   Second semester

  • IndustryAcademia Collaborations in Research and Development

    2017.10 - 2018.3   Second semester

  • 学術英語3・個別テーマ

    2017.10 - 2018.3   Second semester

  • 課題集約演習

    2017.10 - 2018.3   Second semester

  • 無機固体化学

    2017.10 - 2018.3   Second semester

  • Inorganic Solid State Chemistry

    2017.10 - 2018.3   Second semester

  • グリーンケミストリー

    2017.10 - 2018.3   Second semester

  • Task-Based Exercise in Applied Chemistry B

    2017.10 - 2017.12   Fall quarter

  • Experiment in Applied ChemistryⅢ

    2017.10 - 2017.12   Fall quarter

  • Experiment in Applied Chemistry I

    2017.10 - 2017.12   Fall quarter

  • 物質科学情報集約演習

    2017.4 - 2018.3   Full year

  • Graduation Research (Applied Chem)

    2017.4 - 2018.3   Full year

  • 科学技術論

    2017.4 - 2018.3   Full year

  • 環境科学

    2017.4 - 2018.3   Full year

  • エネルギー科学

    2017.4 - 2018.3   Full year

  • 企業インターンシップ

    2017.4 - 2018.3   Full year

  • 物質科学特別演習第一

    2017.4 - 2018.3   Full year

  • Topics in Science and Technology

    2017.4 - 2018.3   Full year

  • 物質科学研究企画演習

    2017.4 - 2018.3   Full year

  • Research Proposal on Molecular Systems

    2017.4 - 2018.3   Full year

  • 物質科学学生セミナー第一

    2017.4 - 2018.3   Full year

  • 物質科学学生セミナー第二

    2017.4 - 2018.3   Full year

  • 物質科学工学卒業研究

    2017.4 - 2018.3   Full year

  • 無機化学

    2017.4 - 2017.9   First semester

  • 物質科学工学実験第二

    2017.4 - 2017.9   First semester

  • 無機材料化学

    2017.4 - 2017.9   First semester

  • 応用化学特別演習第二

    2017.4 - 2017.9   First semester

  • 無機化学第一

    2017.4 - 2017.9   First semester

  • 無機化学第三

    2017.4 - 2017.9   First semester

  • Inorganic Chemistry A

    2017.4 - 2017.6   Spring quarter

  • Experiment in Applied Chemistry II

    2017.4 - 2017.6   Spring quarter

  • Task-Based Exercise in Applied Chemistry C

    2017.4 - 2017.6   Spring quarter

  • Task-Based Exercise in Applied ChemistryA

    2017.4 - 2017.6   Spring quarter

  • 科学英語3・個別テーマ

    2016.10 - 2017.3   Second semester

  • 自然科学総合実験

    2016.10 - 2017.3   Second semester

  • グリーンケミストリー

    2016.10 - 2017.3   Second semester

  • 物質科学工学概論第二

    2016.10 - 2017.3   Second semester

  • 物質科学工学卒業研究

    2016.4 - 2017.3   Full year

  • 物質化学情報集約演習

    2016.4 - 2017.3   Full year

  • 科学技術論

    2016.4 - 2016.9   First semester

  • セラミックス物性学

    2016.4 - 2016.9   First semester

  • セラミックス工学

    2016.4 - 2016.9   First semester

  • 無機物質科学

    2016.4 - 2016.9   First semester

  • 物質科学学生セミナー第二

    2016.4 - 2016.9   First semester

  • 物質科学学生セミナー第一

    2016.4 - 2016.9   First semester

  • 無機固体化学

    2016.4 - 2016.9   First semester

  • 無機化学第三

    2016.4 - 2016.9   First semester

  • Inorganic Chemistry A

    2016.4 - 2016.9   First semester

  • 物質科学工学概論第一

    2016.4 - 2016.9   First semester

  • 無機化学第一

    2016.4 - 2016.9   First semester

  • 無機材料化学

    2015.10 - 2016.3   Second semester

  • 物質科学工学卒業研究

    2015.4 - 2016.3   Full year

  • 物質化学情報集約演習

    2015.4 - 2016.3   Full year

  • 物質科学学生セミナー第二

    2015.4 - 2015.9   First semester

  • 物質科学学生セミナー第一

    2015.4 - 2015.9   First semester

  • Inorganic Chemistry A

    2015.4 - 2015.9   First semester

  • 無機物質科学

    2015.4 - 2015.9   First semester

  • 無機化学第一

    2015.4 - 2015.9   First semester

  • Inorganic Solid State Chemistry

    2015.4 - 2015.9   First semester

  • 無機固体化学

    2015.4 - 2015.9   First semester

  • 無機材料化学

    2014.10 - 2015.3   Second semester

  • 無機化学

    2014.10 - 2015.3   Second semester

  • 物質科学実験第三

    2014.10 - 2015.3   Second semester

  • 物質科学工学卒業研究

    2014.4 - 2015.3   Full year

  • 物質化学情報集約演習

    2014.4 - 2015.3   Full year

  • セラミックス工学

    2014.4 - 2014.9   First semester

  • 物質科学学生セミナー第二

    2014.4 - 2014.9   First semester

  • 物質科学学生セミナー第一

    2014.4 - 2014.9   First semester

  • Inorganic Chemistry A

    2014.4 - 2014.9   First semester

  • セラミックス物性学

    2014.4 - 2014.9   First semester

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FD Participation

  • 2020.7   Role:Participation   Title:アフターコロナの大学はどうあるべきか

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2017.8   Role:Participation   Title:科研費改革について(講師 君塚教授)

    Organizer:Undergraduate school department

  • 2017.4   Role:Moderator   Title:安全衛生・環境管理について(松本准教授、松野准教授)

    Organizer:Undergraduate school department

  • 2017.4   Role:Participation   Title:安全衛生・環境管理について(講師 松本准教授、松野准教授)

    Organizer:Undergraduate school department

  • 2015.9   Role:Participation   Title:新国際コース。入試改革(久枝教授)

    Organizer:Undergraduate school department

  • 2015.8   Role:Speech   Title:GPA制度(林教授)クオーター制(神谷教授)

    Organizer:Undergraduate school department

  • 2015.5   Role:Participation   Title:English Learning in Teaching English

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2014.11   Role:Participation   Title:課題協学授業の進め方(森准教授)

    Organizer:Undergraduate school department

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Visiting, concurrent, or part-time lecturers at other universities, institutions, etc.

  • 2017  東京工業大学・元素戦略研究センター  Classification:Affiliate faculty  Domestic/International Classification:Overseas 

    Semester, Day Time or Duration:H29.4.1~H30.3.31

  • 2016  東京工業大学・元素戦略研究センター  Classification:Affiliate faculty  Domestic/International Classification:Overseas 

    Semester, Day Time or Duration:H28.4.1~H29.3.31

  • 2015  東京工業大学・元素戦略研究センター  Classification:Affiliate faculty  Domestic/International Classification:Overseas 

    Semester, Day Time or Duration:H27.4.1~H28.3.31

  • 2015  東京工業大学 応用セラミックス研究所  Classification:Affiliate faculty 

  • 2014  九州工業大学・応用化学科  Classification:Part-time lecturer 

    Semester, Day Time or Duration:10月24日

  • 2014  東京工業大学 応用セラミックス研究所  Classification:Affiliate faculty  Domestic/International Classification:Japan 

  • 2010  京都大学 化学研究所 附属元素科学国際共同センター 客員准教授  Classification:Affiliate faculty  Domestic/International Classification:Japan 

    Semester, Day Time or Duration:2010.4.1~2011.3.31

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Participation in international educational events, etc.

  • 2022.3

    Japanese Society for Engineering Education (JSEE)

    International Symposium on Digital Transformation of Higher and Recurrent Education through Industry-Academia Collaboration (DXHE2022)

      More details

    Venue:Zoom Webinar

    Number of participants:60

  • 2017.8

    九州大学工学部

    JSTさくらサイエンス QUEST for teachers "Department of Applied Chemistry"

      More details

    Venue:日本国・福岡市

    Number of participants:20

  • 2017.7

    UQ-KUプロジェクト

    UQ-KUプロ ジェクト 講義

      More details

    Venue:九州大学伊都キャンパス

Other educational activity and Special note

  • 2024  Class Teacher 

  • 2023  Class Teacher 

  • 2021  Class Teacher 

  • 2018  Class Teacher 

Outline of Social Contribution and International Cooperation activities

  • Starting with activities at the Kyushu Engineering Association, we conduct educational activities that connect high schools, universities, society, and regions and the world.

Social Activities

  • 一般財団法人 化学物質評価研究機構(CERI)寄付講座

    一般財団法人 化学物質評価研究機構(CERI)  2023.11

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 「将来のエネルギー利用に欠かせない新型蓄電池への化学」という題目で講義を行った。

    鹿児島県甲南高校  2022.11

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    Audience: Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

  • 第15回ケムステVシンポジウム 「複合アニオン」 ファシリテータ

    オンライン Chem-Station (ケムステ) | 化学ポータルサイト / Youtube 公開  2021.2

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

    第15回ケムステVシンポジウムは、日本セラミックス協会との共催です。日本セラミックス協会とは、去年の8月に行った第8回ケムステVシンポジウム「有機無機ハイブリッド」に引き続いて二度目の共催企画となります。

    今回のテーマは「複合アニオン」。無機化合物の中にはカチオンとアニオンの組み合わせとみることができる材料が多数ありますが、複数種類のアニオンを利用したものは比較的未探索の領域でした。そんな無機材料のフロンティアを、新学術領域「複合アニオン化合物の創製と新機能」領域代表の陰山先生を筆頭に、三人の先生方にご紹介いただけます! 最先端の無機固体化学の機能を学ぶ、またとない機会となることでしょう。どうぞ奮ってご登録ください!

  • 一般財団法人 化学物質評価研究機構(CERI)寄付講座

    一般財団法人 化学物質評価研究機構(CERI)  2020.11

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 令和2年度第2学年課題探求最終発表会

    福岡県立春日高校  2020.3

     More details

    Audience: Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

  • 九州大学オープンキャンパス

    九州大学  2019.8

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 九州大学オープンキャンパス

    九州大学  2018.8

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 一般財団法人 化学物質評価研究機構(CERI)寄付講座

    一般財団法人 化学物質評価研究機構(CERI)  2017.11

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • レーザーポインターから原子配列を探る

    山口県立下関西 高等学校 高校訪問事業  2017.9

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    Audience: Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

  • 九州大学オープンキャンパス

    九州大学  2017.8

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • Cooperation agreement between engineering laboratory of advanced battery and materials, Yunnan province (Kunming univeristy of science ant technology, China) and applied inorganic chemistry laboratory (Hayashi laboratory) (Kyushu univeristy, Japan)

    2017

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    Cooperation agreement between engineering laboratory of advanced battery and materials, Yunnan province (Kunming univeristy of science ant technology, China) and applied inorganic chemistry laboratory (Hayashi laboratory) (Kyushu univeristy, Japan)

  • さくらサイエンスQUEST 応用化学コース紹介 (2017/8/25 総合学習プラザ2FのAMS講義室2)

    2017

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    さくらサイエンスQUEST 応用化学コース紹介
    (2017/8/25 総合学習プラザ2FのAMS講義室2)

  • University of Queensland Japan Program for Industry Experience (UQ-JPIE) UQ-KU(オーストラリアのクイーンズランド大学-九州大学)プロジェクト Seminer for Industrial Visit "Ceramic Technology"

    2017

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    University of Queensland Japan Program for Industry Experience (UQ-JPIE)
    UQ-KU(オーストラリアのクイーンズランド大学-九州大学)プロジェクト
    Seminer for Industrial Visit "Ceramic Technology"

  • (一財)化学物質評価研究機構(CERI) 公開講座

    一般財団法人化学物質評価研究機構(CERI) 九州大学大学院工学研究院 応用化学部門 共催: 福岡市 公益財団法人 九州大学学術研究都市推進機構(OPACK) 光と水の伊都未来都市構想  2016.10

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 九州大学オープンキャンパス

    九州大学  2016.8

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • Cooperation agreement between engineering laboratory of advanced battery and materials, Yunnan province (Kunming univeristy of science ant technology, China) and applied inorganic chemistry laboratory (Hayashi laboratory) (Kyushu univeristy, Japan)

    2016

     More details

    Cooperation agreement between engineering laboratory of advanced battery and materials, Yunnan province (Kunming univeristy of science ant technology, China) and applied inorganic chemistry laboratory (Hayashi laboratory) (Kyushu univeristy, Japan)

  • (一財)化学物質評価研究機構(CERI) 公開講座

    一般財団法人化学物質評価研究機構(CERI) 九州大学大学院工学研究院 応用化学部門 共催: 福岡市 公益財団法人 九州大学学術研究都市推進機構(OPACK) 光と水の伊都未来都市構想  2015.10

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 住友金属鉱山・学術指導

    国立大学法人九州大学 学術研究・産学官連携本部 産学官連携推進グループ  W4―8階の産学官連携本部伊都分室会議スペース   2015.6

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Other

  • Cooperation agreement between engineering laboratory of advanced battery and materials, Yunnan province (Kunming univeristy of science ant technology, China) and applied inorganic chemistry laboratory (Hayashi laboratory) (Kyushu univeristy, Japan)

    2015

     More details

    Cooperation agreement between engineering laboratory of advanced battery and materials, Yunnan province (Kunming univeristy of science ant technology, China) and applied inorganic chemistry laboratory (Hayashi laboratory) (Kyushu univeristy, Japan)

  • (一財)化学物質評価研究機構(CERI) 公開講座

    一般財団法人化学物質評価研究機構(CERI) 九州大学大学院工学研究院 応用化学部門 共催: 福岡市 公益財団法人 九州大学学術研究都市推進機構(OPACK) 光と水の伊都未来都市構想  2014.11

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 筑紫高校化学クラブ「廃棄チョークを用いた機能性セラミックスの開発と評価に関する研究」の研究発表に関する指導

    2014.11

     More details

    Audience: Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

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Media Coverage

  • セラミック・ナトリウム電池の開発 酸化物系全個体電池に向けた汎用的ナシコン系電極膜形成 Newspaper, magazine

    クリーンエネルギー Vol.32,No,6 日本工業出版  2023.6

     More details

    セラミック・ナトリウム電池の開発
    酸化物系全個体電池に向けた汎用的ナシコン系電極膜形成

  • 九州大学 「全固体ナトリウム電池」実現へ 電極形成法を開発 850度の低温化焼結 Newspaper, magazine

    電波新聞社 電波新聞 DEMPA DIGITAL  2023.1

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    九州大学 「全固体ナトリウム電池」実現へ 電極形成法を開発 850度の低温化焼結

  • 全固体電池の⾼性能の電極形成法を開発 -安全で過酷な環境でも動作する電池の実現に向け前進

    九州大学 広報室  2023.1

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    全固体電池の⾼性能の電極形成法を開発 -安全で過酷な環境でも動作する電池の実現に向け前進

  • 「全固体ナトリウム電池」実現へ、電極形成法を開発 Newspaper, magazine

    日刊工業新聞 Newswitch  2023.1

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    「全固体ナトリウム電池」実現へ、電極形成法を開発

  • 九大、固体電解質中のイオン輸送能を大きく変化させる隠れパラメータを発見

    2022.6

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    九大、固体電解質中のイオン輸送能を大きく変化させる隠れパラメータを発見

  • In the spotlight: Successful synthesis of perovskite visible-light-absorbing semiconductor material

    EurekAlart  2021.5

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    In the spotlight: Successful synthesis of perovskite visible-light-absorbing semiconductor material

  • 新合成法でペロブスカイト型酸水素化物半導体開発 鉛を含まない安価な光吸収材料開発に期待 Newspaper, magazine

    2021.5

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    新合成法でペロブスカイト型酸水素化物半導体開発 鉛を含まない安価な光吸収材料開発に期待

  • 九大など、鉛フリーで可視光に応答するペロブスカイト型半導体を開発 Newspaper, magazine

    2021.5

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    九大など、鉛フリーで可視光に応答するペロブスカイト型半導体を開発

  • 長波長の可視光に応答する半導体の新合成手法を開拓 Newspaper, magazine

    2021.5

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    長波長の可視光に応答する半導体の新合成手法を開拓

  • 九大ら,ペロブスカイトの吸収波長を長波長化 Newspaper, magazine

    2021.5

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    九大ら,ペロブスカイトの吸収波長を長波長化

  • 九大など、鉛フリーで可視光に応答するペロブスカイト型半導体を開発

    Excite ニュース  2021.5

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    九大など、鉛フリーで可視光に応答するペロブスカイト型半導体を開発

  • 九大など、鉛フリーで可視光に応答するペロブスカイト型半導体を開発

    Biglobe ニュース  2021.5

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    九大など、鉛フリーで可視光に応答するペロブスカイト型半導体を開発

  • 長波長の可視光に応答する半導体の新合成手法を開拓! ~鉛を含まないペロブスカイト型半導体~

    九州大学 NEWS  2021.5

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    長波長の可視光に応答する半導体の新合成手法を開拓!
    ~鉛を含まないペロブスカイト型半導体~

  • 長波長の可視光に応答する半導体の新合成手法を開拓! 鉛を含まないペロブスカイト型半導体

    東工大ニュース  2021.5

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    長波長の可視光に応答する半導体の新合成手法を開拓!
    鉛を含まないペロブスカイト型半導体

  • 金属-空気電池の現状と見通し~プレーヤー動向編~ Newspaper, magazine

    2015.2

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    金属-空気電池の現状と見通し~プレーヤー動向編~

  • 新技術・新製品 東工大、水酸化物イオンをNMR計測だけで特定する手法開発 Newspaper, magazine

    日刊工業新聞  2014.3

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    新技術・新製品 東工大、水酸化物イオンをNMR計測だけで特定する手法開発

  • 科学の扉欄「マイナスの水素の力」 Newspaper, magazine

    朝日新聞  2014.2

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    科学の扉欄「マイナスの水素の力」

  • 専門用語の検索Engine 「空気電池」 Newspaper, magazine

    技術総合誌オーム  2014.2

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    専門用語の検索Engine 「空気電池」

  • 水溶液系ナトリウム空気電池の学術論文の紹介。

    2014.1

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    水溶液系ナトリウム空気電池の学術論文の紹介。

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Activities contributing to policy formation, academic promotion, etc.

  • 2021.4 - 2024.3   日本工学教育協会

    日本工学教育賞選考委員

  • 2021.4 - 2023.3   九州工学教育協会

    九州工学教育協会・常務理事・運営委員・広報部員・賞選考部員

  • 2019.4 - 2021.3   九州工学教育協会

    九州工学教育協会・常任理事

Acceptance of Foreign Researchers, etc.

  • Acceptance period: 2022.4 - 2023.2  

    Nationality:India

  • Tokyo Institute of Technology

    Acceptance period: 2015.1 - 2017.3   (Period):1 month or more

    Nationality:China

    Business entity:Ministry of education