Updated on 2024/10/08

Information

 

写真a

 
YAMAMOTO TOMOKAZU
 
Organization
Faculty of Engineering Assistant Professor
The Ultramicroscopy Research Center （Concurrent）
Title
Assistant Professor
Homepage
External link

Degree

  • PhD(Kyushu University, Japan)

Research Interests・Research Keywords

  • Research theme：1. Electron tomography for nanomaterials 2. Alloy nanoperticle catalysts 3. In-situ TEM observation of nanoparticle catalysts under reaction gas atomosphere 4. Automated electron microscopy analysis with machine learning

    Keyword：Electron microscopy, tomography, operand observation, machine learning, nanoalloy catalyst

    Research period： 2021.4 - 2026.3

Papers

  • Ab Initio molecular dynamics study of threshold displacement energy in Zirconium Nitride Reviewed

    M. M. Rahman, T. Yamamoto, S. Matsumura, J. M. Costantini, K. Yasuda

    Journal of Nuclear Materials   554   2021.10

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    DOI： 10.1016/j.jnucmat.2021.153076

  • Nonequilibrium Flow-Synthesis of Solid-Solution Alloy Nanoparticles: From Immiscible Binary to High-Entropy Alloys Reviewed

    Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Katsutoshi Sato, Katsutoshi Nagaoka, Kenji Terada, Yasuyuki Ikeda, Yoshinari Hirai, Hiroshi Kitagawa

    JOURNAL OF PHYSICAL CHEMISTRY C   125 ( 1 )   458 - 463   2021.1

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    DOI： 10.1021/acs.jpcc.0c08871

  • Atom locations in a Ni doped η-(Cu,Ni)<inf>6</inf>Sn<inf>5</inf> intermetallic compound Reviewed

    158   1 - 5   2019.1

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    © 2018 Elsevier Ltd The present study has succeeded in direct determination of the location of dopant Ni atoms in η-(Cu,Ni)6Sn5 by aberration-corrected scanning transmission electron microscopy (STEM) including atomic-resolution imaging as well as elemental mapping by X-ray energy-dispersive spectroscopy (XEDS). The three sublattices of Sn, Cu1 and Cu2 were distinguished in atomic-resolution images observed along the [21¯1¯0] direction. Atomic-resolution XEDS maps have verified for the first time that the dopant Ni atoms located at the Cu2 sites in η-(Cu,Ni)6Sn5, taking advantage of the Poisson non-local principal component analysis (NLPCA) processing and the lattice-averaging procedure.

    DOI： 10.1016/j.scriptamat.2018.08.020

  • Selective control of fcc and hcp crystal structures in Au-Ru solid-solution alloy nanoparticles Reviewed

    Quan Zhang, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Nature Communications   9 ( 1 )   2018.12

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

    DOI： 10.1038/s41467-018-02933-6

  • Molecular dynamics simulation of point defect accumulation in MgAl<inf>2</inf>O<inf>4</inf> Reviewed

    T. Yamamoto, A. Chartier, K. Yasuda, C. Meis, K. Shiiyama, S. Matsumura

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   266 ( 12-13 )   2676 - 2682   2008.6

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    DOI： 10.1016/j.nimb.2008.03.231

  • Molybdenum-Ruthenium-Carbon Solid-Solution Alloy Nanoparticles: Can They Be Pseudo-Technetium Carbide? Reviewed International journal

    Journal of the American Chemical Society   145   24005 - 24011   2024.11

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  • Platinum-Group Metal High-Entropy Selenides for the Hydrogen Evolution Reaction.

    Deng X, Kusada K, Yamamoto T, Toriyama T, Murakami Y, Tseng JC, Yamada H, Sakata O, Ashitani H, Kawaguchi S, Kubota Y, Kitagawa H

    Angewandte Chemie (International ed. in English)   e202414786   2024.9   （ ISSN:1433-7851 ）

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    DOI： 10.1002/anie.202414786

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  • Atomic-Scale Behavior of Perovskite-Supported Ir-Pd-Ru Nanoparticles under Redox Atmospheres

    Tran, XQ; Yamamoto, T; Aso, K; Yoshioka, S; Kusada, K; Kitagawa, H; Haneda, M; Kawami, Y; Matsumura, S

    NANO LETTERS   24 ( 35 )   11108 - 11115   2024.8   （ ISSN:1530-6984 eISSN:1530-6992 ）

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    An advanced materials solution utilizing the concept of “smart catalysts” could be a game changer for today’s automotive emission control technology, enabling the efficient use of precious metals via their two-way switching between metallic nanoparticle forms and ionic states in the host perovskite lattice as a result of the cyclical oxidizing/reducing atmospheres. However, direct evidence for such processes remains scarce; therefore, the underlying mechanism has been an unsettled debate. Here, we use advanced scanning transmission electron microscopy to reveal the atomic-scale behaviors for a LaFe0.95Pd0.05O3-supported Ir-Pd-Ru nanocatalyst under fluctuating redox conditions, thereby proving the reversible dissolution/exsolution for Ir and Ru but with a limited occurrence for Pd. Despite such selective dissolution during oxidation, all three elements remain cooperatively alloyed in the subsequent reduction, which is a key factor in preserving the catalytic activity of the ternary nanoalloy while displaying its self-regenerating functionality and control of particle agglomeration.

    DOI： 10.1021/acs.nanolett.4c03356

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  • Synthesis of Pd–Pt–P amorphous nanoparticles

    Kenta Ikeda, Megumi Mukoyoshi, Kohei Kusada, Tomokazu Yamamoto, Yasukazu Murakami, Hiroshi Kitagawa

    Chemistry Letters   53 ( 8 )   2024.7   （ ISSN:0366-7022 eISSN:1348-0715 ）

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    Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

    Abstract

    Amorphous materials are very attractive materials because of their unique properties, including high corrosion resistance and catalytic activity. Creating such materials on a nanoscale is very effective in maximizing their performance. However, it is difficult to synthesize amorphous nanomaterials by conventional rapid cooling methods, commonly used for bulk amorphous materials. Therefore, there are not as many reports about amorphous nanomaterials as bulk materials. Herein we report the first synthesis of Pd–Pt–P amorphous nanoparticles by a 2-step synthesis method. They were also characterized.

    DOI： 10.1093/chemle/upae144

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    Other Link： https://academic.oup.com/chemlett/article-pdf/53/8/upae144/58737849/upae144.pdf

  • Atomic-Scale 3D Structure of a Supported Pd Nanoparticle Revealed by Electron Tomography with Convolution Neural Network-Based Image Inpainting

    Iwai, H; Nishino, F; Yamamoto, T; Kudo, M; Tsushida, M; Yoshida, H; Machida, M; Ohyama, J

    SMALL METHODS   8 ( 7 )   e2301163   2024.7   （ ISSN:2366-9608 ）

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    Electron tomography based on scanning transmission electron microscopy (STEM) is used to analyze 3D structures of metal nanoparticles on the atomic scale. However, in the case of supported metal nanoparticle catalysts, the supporting material may interfere with the 3D reconstruction of metal nanoparticles. In this study, a deep learning-based image inpainting method is applied to high-angle annular dark field (HAADF)–STEM images of a supported metal nanoparticle to predict and remove the background image of the support. The inpainting method can separate an 11 nm Pd nanoparticle from the θ-Al2O3 support in HAADF–STEM images of the θ-Al2O3-supported Pd catalyst. 3D reconstruction of the extracted images of the Pd nanoparticle reveals that the Pd nanoparticle adopts a deformed structure of the cuboctahedron model particle, resulting in high index surfaces, which account for the high catalytic activity for methane combustion. Using the xyz coordinate of each Pd atom, the local Pd–Pd bond distance and its variance in a real supported Pd nanoparticle are visualized, showing large strain and disorder at the Pd–Al2O3 interface. The results demonstrate that 3D atomic-scale analysis enables atomic structure-based understanding and design of supported metal catalysts.

    DOI： 10.1002/smtd.202301163

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  • Barium-doped Iron Nanoparticles supported on MgO as an Efficient Catalyst for Ammonia Synthesis under Mild Reaction Conditions

    Kohei Era, Katsutoshi Sato, Shin-ichiro Miyahara, Takahiro Naito, Kanishka De Silva, Saeid Akrami, Hiroshi Yamada, Takaaki Toriyama, Takehiro Tamaoka, Tomokazu Yamamoto, Yasukazu Murakami, Koji Inazu, Katsutoshi Nagaoka

    Sustainable Energy &amp; Fuels   8 ( 12 )   2593 - 2600   2024.6   （ ISSN:2398-4902 eISSN:2398-4902 ）

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    Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    To realize a carbon-neutral society, developing highly active and inexpensive catalysts for ammonia (NH<sub>3</sub>) production working at moderate conditions (&lt;400 °C, &lt;10 MPa) using hydrogen fabricated from the electrolysis of...

    DOI： 10.1039/d4se00411f

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  • First synthesis of RuSn solid-solution alloy nanoparticles and their enhanced hydrogen evolution reaction activity

    Xin Zhou, Megumi Mukoyoshi, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Yasukazu Murakami, Shogo Kawaguchi, Yoshiki Kubota, Okkyun Seo, Osami Sakata, Toshiaki Ina, Hiroshi Kitagawa

    Chemical Science   15 ( 20 )   7560 - 7567   2024.5   （ ISSN:2041-6520 eISSN:2041-6539 ）

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    Solid-solution alloys based on platinum group metals and p-block metals have attracted much attention due to their promising potential as materials with a continuously fine-tunable electronic structure. Here, we report on the first synthesis of novel solid-solution RuSn alloy nanoparticles (NPs) by electrochemical cyclic voltammetry sweeping of RuSn@SnOx NPs. High-angle annular dark-field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy maps confirmed the random and homogeneous distribution of Ru and Sn elements in the alloy NPs. Compared with monometallic Ru NPs, the RuSn alloy NPs showed improved hydrogen evolution reaction (HER) performance. The overpotentials of Ru0.94Sn0.06 NPs/C and Ru0.87Sn0.13 NPs/C to achieve a current density of 10 mA cm−2 were 43.41 and 33.19 mV, respectively, which are lower than those of monometallic Ru NPs/C (53.53 mV) and commercial Pt NPs/C (55.77 mV). The valence-band structures of the NPs investigated by hard X-ray photoelectron spectroscopy demonstrated that the d-band centre of RuSn NPs shifted downward compared with that of Ru NPs. X-ray photoelectron spectroscopy and X-ray absorption near-edge structure analyses indicated that in the RuSn alloy NPs, charge transfer occurs from Sn to Ru, which was considered to result in a downward shift of the d-band centre in RuSn NPs and to regulate the adsorption energy of intermediate Hads effectively, and thus enable the RuSn solid-solution alloy NPs to exhibit excellent HER catalytic properties.

    DOI： 10.1039/d3sc06786f

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  • Phase control of solid-solution RuIn nanoparticles and their catalytic properties

    Xin Zhou, Megumi Mukoyoshi, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Yasukazu Murakami, Hiroshi Kitagawa

    Nanoscale   16 ( 19 )   9311 - 9316   2024.5   （ ISSN:2040-3364 eISSN:2040-3372 ）

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    We achieved the phase control of solid-solution RuIn NPs from fcc to hcp crystal structures by H<sub>2</sub> heat treatment for the first time. The hcp RuIn NPs exhibited enhanced HER catalytic performance in comparison with the fcc RuIn NPs.

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  • In-situ observation of radiation-induced defects in ZrN under electron irradiation in HVEM Reviewed International journal

    M.M. Rahman, T.Yamamoto, S.Matsumura, S. Takaki, M. Takano, J.M. Costantini, K. Yasuda

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   549   2024.4

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  • RuIn Solid-Solution Alloy Nanoparticles with Enhanced Hydrogen Evolution Reaction Activity Reviewed International journal

    Xin Zhou, Megumi Mukoyoshi, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Yasukazu Murakami, Toshiaki Ina, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    ACS Materials Letters   6   353 - 359   2024.2

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  • Denary High-Entropy Oxide Nanoparticles Synthesized by a Continuous Supercritical Hydrothermal Flow Process Reviewed International journal

    Shota Hanabata, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Yoshihide Nishida, Masaaki Haneda, Hiroshi Kitagawa

    Journal of the American Chemical Society   146   181 - 186   2024.1

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  • RuIn Solid-Solution Alloy Nanoparticles with Enhanced Hydrogen Evolution Reaction Activity

    Xin Zhou, Megumi Mukoyoshi, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Yasukazu Murakami, Toshiaki Ina, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    ACS Materials Letters   6 ( 2 )   353 - 359   2023.12   （ eISSN:2639-4979 ）

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    We report the synthesis of novel RuIn solid-solution alloy nanoparticles (NPs) via the electrochemical cleaning of RuIn@InOx NPs. By alloying In to Ru, the RuIn NPs exhibited enhanced hydrogen evolution reaction (HER) activity compared with monometallic face-centered cubic (fcc) Ru NPs. Furthermore, the HER activity of RuIn NPs was comparable to that of commercial Pt catalysts. At a current density of 10 mA cm-2, RuIn NPs displayed a lower overpotential of 30.7 mV compared to monometallic fcc Ru NPs (57.8 mV) and commercial Pt NPs/C (34.1 mV). X-ray photoelectron spectroscopy and X-ray absorption near edge structure analysis revealed charge transfer from In to Ru in RuIn NPs. The results indicate that the alloying of In with Ru leads to beneficial intermetallic charge transfer, which efficiently modulates the desorption energy barrier to intermediate H* and enhances the intrinsic HER performance of monometallic fcc Ru NPs.

    DOI： 10.1021/acsmaterialslett.3c01218

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  • Atomic-Scale 3D Structure of a Supported Pd Nanoparticle Revealed by Electron Tomography with Convolution Neural Network-Based Image Inpainting Invited Reviewed International journal

    Hiroki Iwai, Fumiya Nishino, Tomokazu Yamamoto, Masaki Kudo, Masayuki Tsushida, Hiroshi Yoshida, Masato Machida, Junya Ohyama

    Small Methods   2023.12

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  • Catalytic Behavior of K-doped Fe/MgO Catalysts for Ammonia Synthesis Under Mild Reaction Conditions Reviewed International journal

    Kohei Era, Katsutoshi Sato, Shin-ichiro Miyahara, Takahiro Naito, Kanishka De Silva, Saeid Akrami, Hiroshi Yamada, Takaaki Toriyama, Tomokazu Yamamoto, Yasukazu Murakami, Ken-ichi Aika, Koji Inazu

    ChemSusChem   16   2023.11

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  • CuxRu1-x catalysts for carbon neutralization with CH4 or CO production Invited Reviewed International journal

    Bo Huang, Yuhan Liu, Hirokazu Kobayashi, Zhe Tan, @Tomokazu Yamamoto, @Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Hong Zheng, Hiroshi Kitagawa

    Chem Catalysis   3 ( 8 )   100705   2023.8

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  • Continuous-Flow Chemical Synthesis for Sub-2 nm Ultra-Multielement Alloy Nanoparticles Consisting of Group IV to XV Elements Invited Reviewed International journal

    Hiroki Minamihara, Kohei Kusada, @Tomokazu Yamamoto, @Takaaki Toriyama, @Yasukazu Murakami, Syo Matsumura, Loku Singgappulige Rosantha Kumara, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Okkyun Seo, Satoshi Yasuno, Hiroshi Kitagawa

    Journal of the American Chemical Society   145 ( 31 )   17136 - 17142   2023.8

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  • B2-structured indium-platinum group metal high-entropy intermetallic nanoparticles Reviewed International journal

    Masashi Nakamura, Dongshuang Wu, Megumi Mukoyoshi, Kohei Kusada, @Takaaki Toriyama, @Tomokazu Yamamoto, Syo Matsumura, @Yasukazu Murakami, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Communications   59 ( 62 )   9485 - 9488   2023.7

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  • Dehydrogenative coupling of methane over Pt/Al2O3 catalysts: effect of hydrogen co-feeding Reviewed International journal

    Tatsuki Tomono, Riku Takamura, Miru Yoshida-Hirahara, @Tomokazu Yamamoto, Syo Matsumura, Hideki Kurokawa, Hitoshi Ogihara

    Catalysis Science and Technology   13 ( 16 )   4656 - 4664   2023.6

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  • Self-Assembled Crystalline Bundles in Soluble Metal-Organic Nanotubes Reviewed International journal

    Hao Liang, Kazuya Otsubo, Ken Ichi Otake, Susumu Kitagawa, Shogo Kawaguchi, @Tomokazu Yamamoto, @Yasukazu Murakami, Hiroshi Kitagawa

    Journal of the American Chemical Society   145 ( 17 )   9454 - 9458   2023.5   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/jacs.3c02252

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  • Understanding Micro and Atomic Structures of Secondary Phases in Cu-Doped SnTe Reviewed International journal

    Youichirou Kawami, Xuan Quy Tran, Kohei Aso, Tomokazu Yamamoto, Yuan Wang, Meng Li, Anya Yago, Syo Matsumura, Kazuhiro Nogita, Jin Zou

    small   18 ( 42 )   2204225   2022.10   （ ISSN:1613-6810 eISSN:1613-6829 ）

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    DOI： 10.1002/smll.202204225

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  • The Effect of Ru Precursor and Support on the Hydrogenation of Aromatic Aldehydes/Ketones to Alcohols Reviewed International journal

    Chandan Chaudhari, Katsutoshi Sato, Shin ichiro Miyahara, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Kohei Kusuda, Hiroshi Kitagawa, Katsutoshi Nagaoka

    ChemCatChem   14 ( 16 )   e202200241   2022.8   （ ISSN:1867-3880 eISSN:1867-3899 ）

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    Supported Ru catalysts were prepared by using different Ru precursors and examined for the hydrogenation of benzaldehyde to CHM. The catalyst prepared from Ru3(CO)12 precursor and HT support exhibited high yield of CHM. Moderate acidic and basic nature of HT was favourable to control the selectivity for CHM. The physicochemical properties analysis revealed that highly dispersed Ru nanoparticles were effective for the hydrogenation of benzaldehyde. RuCO/HT catalyst was tolerant to different functional groups and was stable until 7th cycle of recycle study.

    DOI： 10.1002/cctc.202200241

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  • Continuous-Flow Reactor Synthesis for Homogeneous 1 nm-Sized Extremely Small High-Entropy Alloy Nanoparticles

    Minamihara H., Kusada K., Wu D., Yamamoto T., Toriyama T., Matsumura S., Kumara L.S.R., Ohara K., Sakata O., Kawaguchi S., Kubota Y., Kitagawa H.

    Journal of the American Chemical Society   144 ( 26 )   11525 - 11529   2022.7   （ ISSN:00027863 ）

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    High-entropy alloy nanoparticles (HEA NPs) emerged as catalysts with superior performances that are not shown in monometallic catalysts. Although many kinds of synthesis techniques of HEA NPs have been developed recently, synthesizing HEA NPs with ultrasmall particle size and narrow size distribution remains challenging because most of the reported synthesis methods require high temperatures that accelerate particle growth. This work provides a new methodology for the fabrication of ultrasmall and homogeneous HEA NPs using a continuous-flow reactor with a liquid-phase reduction method. We successfully synthesized ultrasmall IrPdPtRhRu HEA NPs (1.32 ± 0.41 nm), theoretically each consisting of approximately 50 atoms. This average size is the smallest ever reported for HEA NPs. All five elements are homogeneously mixed at the atomic level in each particle. The obtained HEA NPs marked a significantly high hydrogen evolution reaction (HER) activity with a very small 6 mV overpotential at 10 mA/cm-2 in acid, which is one-third of the overpotential of commercial Pt/C. In addition, although mass production of HEA NPs is still difficult, this flow synthesis can provide high productivity with high reproducibility, which is more energy efficient and suitable for mass production. Therefore, this study reports the 1 nm-sized HEA NPs with remarkably high HER activity and establishes a platform for the production of ultrasmall and homogeneous HEA NPs.

    DOI： 10.1021/jacs.2c02755

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  • Co Nanoparticle Catalysts Encapsulated by BaO-La2O3 Nanofractions for Efficient Ammonia Synthesis under Mild Reaction Conditions Reviewed International journal

    Shin Ichiro Miyahara, Katsutoshi Sato, Kotoko Tsujimaru, Yuichiro Wada, Yuta Ogura, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Koji Inazu, Katsutoshi Nagaoka

    ACS Omega   7 ( 28 )   24452 - 24460   2022.7   （ ISSN:2470-1343 eISSN:2470-1343 ）

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    DOI： 10.1021/acsomega.2c01973

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  • Compositional dependence of structures and hydrogen evolution reaction activity of platinum-group-metal quinary RuRhPdIrPt alloy nanoparticles Reviewed International journal

    Yuto Maruta, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Okkyun Seo, Satoshi Yasuno, Shogo Kawaguchi, Osami Sakata, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Communications   58 ( 44 )   6421 - 6424   2022.5

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  • Crystal Structure Control of Binary and Ternary Solid-Solution Alloy Nanoparticles with a Face-Centered Cubic or Hexagonal Close-Packed Phase Reviewed International journal

    Quan Zhang, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Journal of the American Chemical Society   144 ( 9 )   4224 - 4232   2022.3   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    The crystal structure significantly affects the physical and chemical properties of solids. However, the crystal structure-dependent properties of alloys are rarely studied because controlling the crystal structure of an alloy at the same composition is extremely difficult. Here, for the first time, we successfully demonstrate the synthesis of binary Ru-Pt (Ru/Pt = 7:3) and Ru-Ir (Ru/Ir = 7:3) and ternary Ru-Ir-Pt (Ru/Ir/Pt = 7:1.5:1.5) solid-solution alloy nanoparticles (NPs) with well-controlled hexagonal close-packed (hcp) and face-centered cubic (fcc) phases, through the chemical reduction method. The crystal structure control is realized by precisely tunning the reduction speeds of the metal precursors. The effect of the crystal structure on the catalytic performance of solid-solution alloy NPs is systematically investigated. Impressively, all the hcp alloy NPs show superior electrocatalytic activities for the hydrogen evolution reaction in alkaline solution compared with the fcc alloy NPs. In particular, hcp-RuIrPt exhibits extremely high intrinsic (mass) activity, which is 3.1 (3.2) and 6.7 (6.9) times enhanced compared to that of fcc-RuIrPt and commercial Pt/C.

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  • Phase Control of Solid-Solution Nanoparticles beyond the Phase Diagram for Enhanced Catalytic Properties Reviewed International journal

    Dongshuang Wu, Kohei Kusada, Susan Meñez Aspera, Hiroshi Nakanishi, Yanna Chen, Okkyun Seo, Chulho Song, Jaemyung Kim, Satoshi Hiroi, Osami Sakata, Tomokazu Yamamoto, Syo Matsumura, Yusuke Nanba, Michihisa Koyama, Naoki Ogiwara, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    ACS Materials Au   2 ( 2 )   110 - 116   2022.3   （ ISSN:2694-2461 eISSN:2694-2461 ）

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    DOI： 10.1021/acsmaterialsau.1c00048

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  • Noble-Metal High-Entropy-Alloy Nanoparticles: Atomic-Level Insight into the Electronic Structure Reviewed International journal

    Dongshuang Wu, Kohei Kusada, Yusuke Nanba, Michihisa Koyama, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Okkyun Seo, Ibrahima Gueye, Jaemyung Kim, Loku Singgapulige Rosantha Kumara, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Journal of the American Chemical Society   144 ( 8 )   3365 - 3369   2022.3   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    The compositional space of high-entropy-alloy nanoparticles (HEA NPs) significantly expands the diversity of the materials library. Every atom in HEA NPs has a different elemental coordination environment, which requires knowledge of the local electronic structure at an atomic level. However, such structure has not been disclosed experimentally or theoretically. We synthesized HEA NPs composed of all eight noble-metal-group elements (NM-HEA) for the first time. Their electronic structure was revealed by hard X-ray photoelectron spectroscopy and density function theory calculations with NP models. The NM-HEA NPs have a lower degeneracy in energy level compared with the monometallic NPs, which is a common feature of HEA NPs. The local density of states (LDOS) of every surface atom was first revealed. Some atoms of the same constituent element in HEA NPs have different LDOS profiles, whereas atoms of other elements have similar LDOS profiles. In other words, one atom in HEA loses its elemental identity and it may be possible to create an ideal LDOS by adjusting the neighboring atoms. The tendency of the electronic structure change was shown by supervised learning. The NM-HEA NPs showed 10.8-times higher intrinsic activity for hydrogen evolution reaction than commercial Pt/C, which is one of the best catalysts.

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  • Nitrile hydrogenation to secondary amines under ambient conditions over palladium-platinum random alloy nanoparticles Invited Reviewed International journal

    Yoshihide Nishida, Katsutoshi Sato, Chandan Chaudhari, Hiroshi Yamada, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Susan Meñez Aspera, Hiroshi Nakanishi, Masaaki Haneda, Katsutoshi Nagaoka

    Catalysis Science and Technology   12 ( 13 )   4128 - 4137   2022.3   （ ISSN:2044-4753 eISSN:2044-4761 ）

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    Catalytic hydrogenation of nitriles is a cost-effective and green method for synthesizing amines and imines, which have many industrial applications. However, this reaction generally requires harsh reaction conditions and produces a mixture of amine and imine products due to its chemodiversity. Therefore, it is a challenge to selectively hydrogenate nitriles to a single product under ambient conditions (1 bar of H2 at 25 °C). Here, we report an effective method for selective hydrogenation of nitriles that does not require heat, pressurization, or long reaction times. We achieved this by means of bimetalization between palladium (Pd) and platinum (Pt) nanoparticles, which resulted in a catalyst that showed high yield of secondary amines. Although Pd and Pt are thermodynamically immiscible, we have successfully alloyed the two metals by means of rapid chemical reduction assisted by microwave heating. X-ray absorption spectroscopy suggested the formation of heteroatomic Pdδ+Ptδ− sites via charge transfer between neighboring Pd and Pt atoms in the alloy structure. Moreover, Fourier transform IR spectroscopy and scanning transmission electron microscopy-energy-dispersive X-ray spectroscopy indicated that decreasing the size of the PdPt (50 : 50) nanoparticles improved the degree of alloying and facilitated the formation of electron-enriched Ptδ− species. On the basis of kinetics studies and density functional theory calculations, we concluded that cyano group activation, which was the rate-determining step over monometallic Pd and Pt catalysts, was accelerated over the heteroatomic Pdδ+Ptδ− sites because of strong back-donation from electron-enriched Ptδ− species to the carbon atom of the cyano groups. The PdPt random alloy nanoparticles catalyzed the reactions of various aromatic and heterocyclic nitriles, and the corresponding secondary amines were selectively obtained in just a few hours.

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  • In-situ observation of damage structure in Cu-Cr-Zr and Cu-Cr alloy during 1.25 MeV electron irradiation Reviewed International journal

    M. Hatakeyama, T. Yamamoto, K. Yasuda, S. Matsumura, K. Yasunaga, K. Sato

    Nuclear Materials and Energy   30   101144   2022.3   （ eISSN:2352-1791 ）

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    The sink strengths of precipitate/matrix interfaces in Cu alloys, were investigated by performing in-situ observation of electron irradiation in high-voltage electron microscopy (HVEM). Fine black spot defects, which seemed to be dislocation loops were observed at irradiation temperature ranging between RT and 373 K in Cu–Cr–Zr, Cu–Cr and GlidCop Al–60 alloys with low number density. In Cu–Cr, loops formed on a part of precipitates interfaces. Hence, a part of precipitate/matrix interfaces is a sink with interstitial bias. Whereas, most of the interfaces are neutral sinks for point defects. In the case of Cu–Cr–Zr and GlidCop Al–60, black spots formed around dislocation, which were induced during two-step heat treatment. The results showed that the precipitate/matrix interface of Cr-rich precipitates in Cu alloys serve as a strong sink for point defects.

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  • Selective Oxidation of Methane to Formaldehyde over a Silica-Supported Cobalt Single-Atom Catalyst Reviewed International journal

    J. Ohyama, D. Abe, A. Hirayama, H. Iwai, Y. Tsuchimura, K. Sakamoto, M. Irikura, Y. Nakamura, H. Yoshida, M. Machida, S. Nishimura, @T. Yamamoto, @S. Matsumura, K. Takahashi

    Journal of Physical Chemistry C   126 ( 4 )   1785 - 1792   2022.2   （ ISSN:1932-7447 eISSN:1932-7455 ）

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    Catalytic oxidation of methane to formaldehyde and methanol has attracted attention because of its advantage in energy efficiency over the conventional multistep reaction process involving endothermic steam reforming of CH4; however, it is challenging to selectively obtain the partial oxidation products in the direct oxidation of CH4. In the present study, Co/SiO2 with various Co loadings was tested for the CH4/O2/H2O gas flow reaction. As a result, Co/SiO2 with a low loading of ≤0.1 wt % showed high selectivity for the partial oxidation reaction and mainly produced HCHO, while Co/SiO2 with high Co loadings proceeded to complete oxidation. Structural analysis using X-ray absorption fine-structure spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and scanning transmission electron microscopy suggested that single Co atoms generated at low Co loadings were effective in the selective oxidation of CH4 to HCHO, while Co3O4 nanoparticles generated at high Co loadings promoted the complete oxidation.

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    Other Link： https://doi.org/10.1021/acs.jpcc.1c08739

  • Porous nanographene formation on γ-alumina nanoparticles via transition-metal-free methane activation Reviewed International journal

    13 ( 11 )   3140 - 3146   2022.2

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    DOI： 10.1039/d1sc06578e

  • Atomic insights into the ordered solid solutions of Ni and Au in η-Cu<inf>6</inf>Sn<inf>5</inf> Reviewed International journal

    Wenhui Yang, Xuan Quy Tran, Tomokazu Yamamoto, Kohei Aso, Flora Somidin, Xin Fu Tan, Youichirou Kawami, Kazuhiro Nogita, Syo Matsumura

    Acta Materialia   224   117513   2022.2   （ ISSN:1359-6454 eISSN:1873-2453 ）

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    The Cu6Sn5 intermetallic, which commonly forms at the solder interconnects, is a critical component contributing to the reliability of today's electronic products. It has been established that the structural control of its hexagonal η-Cu6Sn5 polymorph can be achieved over a wide temperature range of service conditions via chemical doping with Ni or Au, effectively suppressing the undesirable hexagonal to monoclinic (ƞ → ƞ′) phase transition at 186 °C and its associated volume change. In this study, we further investigate the effects of Ni (26.5 at%) and Au (9 at%), with high doping/alloying contents, on the atomic-scale structure of η-Cu6Sn5 using a suite of microscopy techniques including atomic-resolution imaging, chemical mapping, electron diffraction, and in-situ heating, coupled with advanced data informatics. Our study reveals that while Ni occupancy takes place in both the Cu1 and Cu2 sites of η-Cu6Sn5 in substantial amounts, Au is mostly substituted at the Cu1 sites of η-Cu6Sn5. Most interestingly, characteristic occupational modulations of the Cu6Sn5 structure arise with each type of dopants: a three-fold ordered structure for Ni accompanied by a displacive modulation of the constituent atoms, but a two-fold layer-like structure for Au. Moreover, with a high content of Ni, the unit cell of η-Cu6Sn5 is found to contract along its hexagonal ah axis relative to the Ni-dilute case, but anisotropically expands the ch axis in a bimodal fashion; in contrast, the effect of Au appears to be of an isotropically expanding nature.

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  • Charge partitioning by intertwined metal-oxide nano-architectural networks for the photocatalytic dry reforming of methane Reviewed International journal

    Shusaku Shoji, Abdillah Sani Bin Mohd Najib, Min Wen Yu, Tomokazu Yamamoto, Sou Yasuhara, Akira Yamaguchi, Xiaobo Peng, Syo Matsumura, Satoshi Ishii, Yohei Cho, Takeshi Fujita, Shigenori Ueda, Kuo Ping Chen, Hideki Abe, Masahiro Miyauchi

    Chem Catalysis   2 ( 2 )   321 - 329   2022.2   （ ISSN:2667-1093 eISSN:2667-1093 ）

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    The photocatalytic dry reforming of methane (photoDRM: CH4 + CO2 = 2CO + 2H2) converts greenhouse gases into valuable synthesis gas with photon energy. However, previous photoDRM catalysts comprising supported metal nanoparticles hardly avoid the recombination of photoexcited charges. Herein, we report that significant photoDRM performance can be achieved by a metal-oxide nanocomposite consisting of nanometer-thick, intertwined networks of fibrous rhodium metal and cerium dioxide, i.e., Rh#CeO2. The Rh#CeO2 nanocomposite exhibits the world-highest conversion and yield in photoDRM under UV light irradiation, being accompanied with no other side reactions such as reverse water gas shift reaction. Theoretical simulations and Kelvin probe force microscopy demonstrate that the photoexcited electrons and holes in Rh#CeO2 are efficiently partitioned into the Rh- and CeO2 nanophases, respectively. The efficient charge partitioning in Rh#CeO2 accounts for the selective photoDRM reaction.

    DOI： 10.1016/j.checat.2021.11.015

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  • Quantitative Characterization of the Thermally Driven Alloying State in Ternary Ir-Pd-Ru Nanoparticles Reviewed International journal

    Xuan Quy Tran, Kohei Aso, Tomokazu Yamamoto, Wenhui Yang, Yoshiki Kono, Kohei Kusada, Dongshuang Wu, Hiroshi Kitagawa, Syo Matsumura

    ACS Nano   16 ( 1 )   1612 - 1624   2022.1   （ ISSN:1936-0851 eISSN:1936-086X ）

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    Compositional and structural arrangements of constituent elements, especially those at the surface and near-surface layers, are known to greatly influence the catalytic performance of alloyed nanoparticles (NPs). Although much research effort often focuses on the ability to tailor these important aspects in the design stage, their stability under realistic operating conditions remains a major technical challenge. Here, the compositional stability and associated structural evolution of a ternary iridium-palladium-ruthenium (Ir-Pd-Ru) nanoalloy at elevated temperatures have been studied using interrupted in situ scanning transmission electron microscopy and theoretical modeling. The results are based on a combinatory approach of statistical sampling at the sub-nanometer scale for large groups of NPs as well as tracking individual NPs. We find that the solid solution Ir-Pd-Ru NPs (?5.6 nm) evolved into a Pd-enriched shell supported on an alloyed Ir-Ru-rich core, most notably when the temperature exceeds 500 °C, concurrently with the development of expansive atomic strain in the outer surface and subsurface layers with respect to the core regions. Theoretically, we identify the weak interatomic bonds, low surface energy, and large atomic sizes associated with Pd as the key factors responsible for such observed features.

    DOI： 10.1021/acsnano.1c10414

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  • Barium oxide encapsulating cobalt nanoparticles supported on magnesium oxide: Active non-noble metal catalysts for ammonia synthesis under mild reaction conditions Reviewed International journal

    Katsutoshi Sato, Katsutoshi Nagaoka, Shin Ichiro Miyahara, Kotoko Tsujimaru, Yuichiro Wada, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Koji Inazu, Hirono Mohri, Takeshi Iwasa, Tetsuya Taketsugu

    ACS Catalysis   11 ( 21 )   13050 - 13061   2021.11

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    DOI： 10.1021/acscatal.1c02887

  • Subpercent Local Strains Due to the Shapes of Gold Nanorods Revealed by Data-Driven Analysis Reviewed

    Kohei Aso, Jens Maebe, Xuan Quy Tran, Tomokazu Yamamoto, Yoshifumi Oshima, Syo Matsumura

    ACS Nano   2021.7

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    DOI： 10.1021/acsnano.1c03413

  • Boosting reverse water-gas shift reaction activity of Pt nanoparticles through light doping of W Reviewed

    Journal of Materials Chemistry A   2021.7

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    DOI： 10.1039/d1ta03480d

  • Ni@onion-like carbon and Co@amorphous carbon: control of carbon structures by metal ion species in MOFs Reviewed

    Megumi Mukoyoshi, Hirokazu Kobayashi, Kohei Kusada, Kazuya Otsubo, Mitsuhiko Maesato, Yoshiki Kubota, Tomokazu Yamamoto, Syo Matsumura, Hiroshi Kitagawa

    CHEMICAL COMMUNICATIONS   2021.5

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    DOI： 10.1039/d1cc02154k

  • Cu-Pd-B Alloy Nanoparticles Synthesized by External Boron Doping Method Reviewed

    Keigo Kobayashi, Kohei Kusada, Hirokazu Kobayashi, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Hiroshi Kitagawa

    CHEMISTRY LETTERS   50 ( 4 )   611 - 614   2021.4

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    DOI： 10.1246/cl.200861

  • Highly Stable and Active Solid-Solution-Alloy Three-Way Catalyst by Utilizing Configurational-Entropy Effect Reviewed

    Kohei Kusada, Dongshuang Wu, Yusuke Nanba, Michihisa Koyama, Tomokazu Yamamoto, Xuan Quy Tran, Takaaki Toriyama, Syo Matsumura, Ayano Ito, Katsutoshi Sato, Katsutoshi Nagaoka, Okkyun Seo, Chulho Song, Yanna Chen, Natalia Palina, Loku Singgappulige Rosantha Kumara, Satoshi Hiroi, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    ADVANCED MATERIALS   33 ( 16 )   2021.4

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    DOI： 10.1002/adma.202005206

  • First Observation of Superconductivity in Molybdenum-Ruthenium-Carbon Alloy Nanoparticles Reviewed

    Shinya Okazoe, Kohei Kusada, Yukihiro Yoshida, Mitsuhiko Maesato, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    CHEMISTRY LETTERS   50 ( 4 )   596 - 598   2021.4

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    DOI： 10.1246/cl.200779

  • Enhanced Hydrogenation Catalytic Activity of Ruthenium Nanoparticles by Solid-Solution Alloying with Molybdenum Reviewed

    Shinya Okazoe, Lena Staiger, Mirza Cokoja, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Hiroshi Kitagawa, Roland A. Fischer

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY   2021 ( 12 )   1186 - 1189   2021.3

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    DOI： 10.1002/ejic.202001141

  • Catalytic roles and synergetic effects of iron-group elements on monometals and alloys for electrochemical oxidation of ammonia Reviewed

    Sho Kitano, Mei Lee Ooi, Tomokazu Yamamoto, Syo Matsumura, Miho Yamauchi

    Bulletin of the Chemical Society of Japan   94 ( 4 )   1292 - 1299   2021.2

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    DOI： 10.1246/bcsj.20210007

  • In Situ TEM Investigation of Structural Changes in Ni Nanoparticle Catalysts under Gas Atmospheres: Implications for Catalyst Degradation Reviewed

    Junko Matsuda, Tomokazu Yamamoto, Shinji Takahashi, Hiroshi Nakanishi, Kazunari Sasaki, Syo Matsumura

    ACS Applied Nano Materials   2021.2

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    DOI： 10.1021/acsanm.1c00006

  • Efficient overall water splitting in acid with anisotropic metal nanosheets Reviewed

    Dongshuang Wu, Kohei Kusada, Satoru Yoshioka, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Yanna Chen, Okkyun Seo, Jaemyung Kim, Chulho Song, Satoshi Hiroi, Osami Sakata, Toshiaki Ina, Shogo Kawaguchi, Yoshiki Kubota, Hirokazu Kobayashi, Hiroshi Kitagawa

    NATURE COMMUNICATIONS   12 ( 1 )   2021.2

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    DOI： 10.1038/s41467-021-20956-4

  • Chemoselective hydrogenation of heteroarenes and arenes by Pd–Ru–PVP under mild conditions Reviewed

    10 ( 72 )   44191 - 44195   2020.12

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    <p>Recyclable Pd0.5Ru0.5–PVP catalyst showed higher activity than monometallic Pd or Ru catalyst for the hydrogenation of quinoline. Furthermore, Pd0.5Ru0.5–PVP was able to hydrogenate different arenes.</p>

    DOI： 10.1039/d0ra09981c

  • On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles Reviewed

    Dongshuang Wu, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Ibrahima Gueye, Okkyun Seo, Jaemyung Kim, Satoshi Hiroi, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Science   11 ( 47 )   12731 - 12736   2020.12

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    DOI： 10.1039/d0sc02351e

  • Synthesis of Mo and Ru solid-solution alloy NPs and their hydrogen evolution reaction activity Reviewed

    Shinya Okazoe, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Communications   56 ( 92 )   14475 - 14478   2020.11

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    DOI： 10.1039/d0cc05958g

  • Coreduction methodology for immiscible alloys of CuRu solid-solution nanoparticles with high thermal stability and versatile exhaust purification ability Reviewed

    Bo Huang, Hirokazu Kobayashi, Tomokazu Yamamoto, Syo Matsumura, Yoshihide Nishida, Katsutoshi Sato, Katsutoshi Nagaoka, Masaaki Haneda, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Science   11 ( 42 )   11413 - 11418   2020.11

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    DOI： 10.1039/d0sc03373a

  • Statistical Evaluation of the Solid-Solution State in Ternary Nanoalloys Reviewed

    Xuan Quy Tran, Yoshiki Kono, Tomokazu Yamamoto, Kohei Kusada, Hiroshi Kitagawa, Syo Matsumura

    Journal of Physical Chemistry C   124 ( 39 )   21843 - 21852   2020.10

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    DOI： 10.1021/acs.jpcc.0c06813

  • Significant Enhancement of Hydrogen Evolution Reaction Activity by Negatively Charged Pt through Light Doping of W Reviewed

    Journal of the American Chemical Society   142 ( 41 )   17250 - 17254   2020.10

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    DOI： 10.1021/jacs.0c07143

  • Local structure investigations of accumulated damage in irradiated MgAl<inf>2</inf>O<inf>4</inf> Reviewed

    Satoru Yoshioka, Konosuke Tsuruta, Tomokazu Yamamoto, Kazuhiro Yasuda, Syo Matsumura, Takeharau Sugiyama, Yojiro Oba, Norito Ishikawa, Eiichi Kobayashi, Koji Okudaira

    Journal of the American Ceramic Society   103 ( 8 )   4654 - 4663   2020.8

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    DOI： 10.1111/jace.17101

  • Platinum-Group-Metal High-Entropy-Alloy Nanoparticles Reviewed

    Dongshuang Wu, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Journal of the American Chemical Society   142 ( 32 )   13833 - 13838   2020.8

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    DOI： 10.1021/jacs.0c04807

  • Atomic locations of minor dopants and their roles in the stabilization of η- C u6 S n5 Reviewed

    4 ( 6 )   2020.6

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    © 2020 American Physical Society. Chemical modification using only small amounts of elements such as Zn, In, Sb, or Ni has proven to be an effective means to control the desirable crystal structure of hexagonal η-Cu6Sn5 over a wide thermally operating window, typically found in Pb-free Sn-based soldering or Li-ion battery anode applications. Though appealing, the underlying mechanisms on the role of these dopants remain incomplete and their atomic arrangements within the η-Cu6Sn5 lattices have not yet been experimentally determined. In the current study, we directly reveal the atomic positions of Zn, In, and Sb at the Sn sites of η-Cu6Sn5 via atomic-scale x-ray energy dispersive spectroscopy (XEDS) maps utilizing advanced Cs-corrected scanning transmission electron microscopy. The use of advanced statistical algorithms including Poisson non-local principal component analysis and lattice averaging enables the fine resolution of weak XEDS maps from trace dopant elements. Our first-principles calculations further identify the influence of dopants at these atomic sites on the overall energetics, electronic structures, as well as local bonding environments, leading to the most favorable situations for η-Cu6Sn5 stabilization.

    DOI： 10.1103/PhysRevMaterials.4.065002

  • Effect of Calcination and Reduction Temperatures on the Catalytic Activity of Ru/La<inf>0.5</inf>Ce<inf>0.5</inf>O<inf>1.75</inf> for Ammonia Synthesis under Mild Conditions Reviewed

    Yuta Ogura, Takahiro Asai, Katsutoshi Sato, Shin ichiro Miyahara, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Nagaoka

    Energy Technology   8 ( 6 )   2020.6

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    DOI： 10.1002/ente.202000264

  • Significantly enhanced CO oxidation activity induced by a change in the CO adsorption site on Pd nanoparticles covered with metal-organic frameworks Reviewed

    Yoshimasa Aoyama, Hirokazu Kobayashi, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Masaaki Haneda, Hiroshi Kitagawa

    Chemical Communications   56 ( 27 )   3839 - 3842   2020.3

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    DOI： 10.1039/d0cc00566e

  • Surface dynamics for creating highly active ru sites for ammonia synthesis: Accumulation of a low-crystalline, oxygen-deficient nanofraction Reviewed

    Katsutoshi Sato, Shin ichiro Miyahara, Yuta Ogura, Kotoko Tsujimaru, Yuichiro Wada, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Nagaoka

    ACS Sustainable Chemistry and Engineering   8 ( 7 )   2726 - 2734   2020.2

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    DOI： 10.1021/acssuschemeng.9b06299

  • Photocatalytic uphill conversion of natural gas beyond the limitation of thermal reaction systems Reviewed

    Shusaku Shoji, Xiaobo Peng, Akira Yamaguchi, Ryo Watanabe, Choji Fukuhara, Yohei Cho, Tomokazu Yamamoto, Syo Matsumura, Min Wen Yu, Satoshi Ishii, Takeshi Fujita, Hideki Abe, Masahiro Miyauchi

    Nature Catalysis   3 ( 2 )   148 - 153   2020.2

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    DOI： 10.1038/s41929-019-0419-z

  • Rational Synthesis for a Noble Metal Carbide Reviewed

    Takuo Wakisaka, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Hiroshi Akiba, Osamu Yamamuro, Kazutaka Ikeda, Toshiya Otomo, Natalia Palina, Yanna Chen, Loku S.R. Kumara, Chulho Song, Osami Sakata, Wei Xie, Michihisa Koyama, Yoshiki Kubota, Shogo Kawaguchi, Ryan L. Arevalo, Susan M. Aspera, Elvis F. Arguelles, Hiroshi Nakanishi, Hiroshi Kitagawa

    Journal of the American Chemical Society   142 ( 3 )   1247 - 1253   2020.1

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    DOI： 10.1021/jacs.9b09219

  • Catalytic activity of Rh nanoparticles with high-index faces for hydrogen evolution reaction in alkaline solution Reviewed

    Takuo Wakisaka, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Hiroshi Kitagawa

    Chemistry Letters   49 ( 2 )   207 - 209   2019.12

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    DOI： 10.1246/cl.190830

  • Atomic structure observations and reaction dynamics simulations on triple phase boundaries in solid-oxide fuel cells Reviewed

    Shu Sheng Liu, Leton C. Saha, Albert Iskandarov, Takayoshi Ishimoto, Tomokazu Yamamoto, Yoshitaka Umeno, Syo Matsumura, Michihisa Koyama

    Communications Chemistry   2 ( 1 )   2019.12

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    DOI： 10.1038/s42004-019-0148-x

  • Discovery of face-centred cubic Os nanoparticles Reviewed

    Takuo Wakisaka, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Gueye Ibrahima, Okkyun Seo, Jaemyung Kim, Satoshi Hiroi, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Communications   56 ( 3 )   372 - 374   2019.11

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    DOI： 10.1039/c9cc09192k

  • Pt–Co Alloy Nanoparticles on a γ-Al<inf>2</inf>O<inf>3</inf> Support: Synergistic Effect between Isolated Electron-Rich Pt and Co for Automotive Exhaust Purification Reviewed

    84 ( 5 )   447 - 456   2019.5

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    © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim There is interest in minimizing or eliminating the use of Pt in catalysts by replacing it with more widely abundant and cost-effective elements. The alloying of Pt with non-noble metals is a potential strategy for reducing Pt use because interactions between Pt and non-noble metals can modify the catalyst structure and electronic properties. Here, a γ-Al2O3-supported bimetallic catalyst [Pt(0.1)Co(1)/Al2O3] was prepared which contained 0.1 wt % Pt and 1 wt % Co and thus featured an extremely low Pt : Co ratio (<1 : 30 mol/mol). The Pt and Co in this catalyst formed alloy nanoparticles in which isolated electron-rich Pt atoms were present on the nanoparticle surface. The activity of this Pt(0.1)Co(1)/Al2O3 catalyst for the purification of automotive exhaust was comparable to the activities of 0.3 and 0.5 wt % Pt/γ-Al2O3 catalysts. Electron-rich Pt and metallic Co promoted activation of NOx and oxidization of CO and hydrocarbons, respectively. This strategy of tuning the surrounding structure and electronic state of a noble metal by alloying it with an excess of a non-noble metal will enable reduced noble metal use in catalysts for exhaust purification and other environmentally important reactions.

    DOI： 10.1002/cplu.201800542

  • Solid-solution alloy nanoparticles of a combination of immiscible Au and Ru with a large gap of reduction potential and their enhanced oxygen evolution reaction performance Reviewed

    Quan Zhang, Kohei Kusada, Dongshuang Wu, Naoki Ogiwara, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Tetsuo Honma, Hiroshi Kitagawa

    Chemical Science   10 ( 19 )   5133 - 5137   2019.4

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    DOI： 10.1039/c9sc00496c

  • Structural and Thermodynamic Studies of Hydrogen Absorption/Desorption Processes on PdPt Nanoparticles Reviewed

    Hiroshi Akiba, Hirokazu Kobayashi, Hiroshi Kitagawa, Kazutaka Ikeda, Toshiya Otomo, Tomokazu Yamamoto, Syo Matsumura, Osamu Yamamuro

    Journal of Physical Chemistry C   123 ( 14 )   9471 - 9478   2019.4

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    DOI： 10.1021/acs.jpcc.8b11380

  • Sequential transmission electron microscopy observation of the shape change of gold nanorods under pulsed laser light irradiation Reviewed

    Kohei Aso, Koji Shigematsu, Tomokazu Yamamoto, Syo Matsumura

    Microscopy   68 ( 2 )   174 - 180   2019.4

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    DOI： 10.1093/jmicro/dfy136

  • A CO Adsorption Site Change Induced by Copper Substitution in a Ruthenium Catalyst for Enhanced CO Oxidation Activity Reviewed

    Bo Huang, Hirokazu Kobayashi, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Yoshihide Nishida, Katsutoshi Sato, Katsutoshi Nagaoka, Masaaki Haneda, Wei Xie, Yusuke Nanba, Michihisa Koyama, Fenglong Wang, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Angewandte Chemie - International Edition   58 ( 8 )   2230 - 2235   2019.2

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

    DOI： 10.1002/anie.201812325

  • Charge transfer dependence on CO<inf>2</inf> hydrogenation activity to methanol in Cu nanoparticles covered with metal-organic framework systems Reviewed

    Hirokazu Kobayashi, Jared M. Taylor, Yuko Mitsuka, Naoki Ogiwara, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Hiroshi Kitagawa

    Chemical Science   10 ( 11 )   3289 - 3294   2019.2

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    DOI： 10.1039/c8sc05441j

  • Ambient-temperature oxidative coupling of methane in an electric field by a cerium phosphate nanorod catalyst Reviewed

    Ayaka Sato, Shuhei Ogo, Keigo Kamata, Yuna Takeno, Tomohiro Yabe, Tomokazu Yamamoto, Syo Matsumura, Michikazu Hara, Yasushi Sekine

    Chemical Communications   55 ( 28 )   4019 - 4022   2019.2

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    DOI： 10.1039/c9cc00174c

  • Ru/La<inf>0.5</inf>Pr<inf>0.5</inf>O<inf>1.75</inf> Catalyst for Low-Temperature Ammonia Synthesis Reviewed

    Yuta Ogura, Kotoko Tsujimaru, Katsutoshi Sato, Shin Ichiro Miyahara, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Nagaoka

    ACS Sustainable Chemistry and Engineering   6 ( 12 )   17258 - 17266   2018.12

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    DOI： 10.1021/acssuschemeng.8b04683

  • Emergence of high ORR activity through controlling local density-of-states by alloying immiscible Au and Ir Reviewed

    Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Wei Xie, Michihisa Koyama, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Science   10 ( 3 )   652 - 656   2018.12

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    DOI： 10.1039/c8sc04135k

  • Coating of 2D flexible metalorganic frameworks on metal nanocrystals Reviewed

    Naoki Ogiwara, Hirokazu Kobayashi, Keigo Kobayashi, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Hiroshi Kitagawa

    Chemistry Letters   48 ( 2 )   173 - 176   2018.12

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    DOI： 10.1246/cl.180931

  • The local structure in heavily boron-doped diamond and the effect this has on its electrochemical properties Reviewed

    Takeshi Watanabe, Satoru Yoshioka, Tomokazu Yamamoto, Hossein Sepehri-Amin, Tadakatsu Ohkubo, Syo Matsumura, Yasuaki Einaga

    Carbon   137   333 - 342   2018.10

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    DOI： 10.1016/j.carbon.2018.05.026

  • Influence of the Crystal Structure of Titanium Oxide on the Catalytic Activity of Rh/TiO<inf>2</inf> in Steam Reforming of Propane at Low Temperature Reviewed

    Lin Yu, Katsutoshi Sato, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Nagaoka

    Chemistry - A European Journal   24 ( 35 )   8742 - 8746   2018.6

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

    DOI： 10.1002/chem.201800936

  • Solid-Solution Alloy Nanoparticles of the Immiscible Iridium–Copper System with a Wide Composition Range for Enhanced Electrocatalytic Applications Reviewed

    57 ( 17 )   4505 - 4509   2018.4

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    © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim For the first time, we synthesize solid-solution alloy nanoparticles of Ir and Cu with a size of ca. 2 nm, despite Ir and Cu being immiscible in the bulk up to their melting over the whole composition range. We performed a systematic characterization on the nature of the IrxCu1−x solid-solution alloys using powder X-ray diffraction, scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. The results showed that the IrxCu1−x alloys had a face-centered-cubic structure; charge transfer from Cu to Ir occurred in the alloy nanoparticles, as the core-level Ir 4f peaks shifted to lower energy region with the increase in Cu content. Furthermore, we observed that the alloying of Ir with Cu enhanced both the electrocatalytic oxygen evolution and oxygen reduction reactions. The enhanced activities could be attributed to the electronic interaction between Ir and Cu arising from the alloying effect at atomic-level.

    DOI： 10.1002/anie.201800650

  • Stem analysis of atom location in (Cu, Au, Ni)6Sn5intermetallic compounds Reviewed

    Wen Hui Yang, Tomokazu Yamamoto, Kazuhiro Nogita, Syo Matsumura

    Solid State Phenomena   273 SSP   95 - 100   2018.4

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    DOI： 10.4028/www.scientific.net/SSP.273.95

  • Double enhancement of hydrogen storage capacity of Pd nanoparticles by 20 at&#37; replacement with Ir; Systematic control of hydrogen storage in Pd-M nanoparticles (M = Ir, Pt, Au) Reviewed

    Hirokazu Kobayashi, Miho Yamauchi, Ryuichi Ikeda, Tomokazu Yamamoto, Syo Matsumura, Hiroshi Kitagawa

    Chemical Science   9 ( 25 )   5536 - 5540   2018.4

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    DOI： 10.1039/c8sc01460d

  • Stem analysis of atom location in (Cu, Au, Ni)6Sn5intermetallic compounds

    Wen Hui Yang, Tomokazu Yamamoto, Kazuhiro Nogita, Syo Matsumura

    Electronic Packaging Interconnect Technology Symposium, EPITS 2017 Electronic Packaging Interconnect Technology   95 - 100   2018.1

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    DOI： 10.4028/www.scientific.net/SSP.273.95

  • Efficient ammonia synthesis over a Ru/La<inf>0.5</inf>Ce<inf>0.5</inf>O<inf>1.75</inf> catalyst pre-reduced at high temperature Reviewed

    Yuta Ogura, Katsutoshi Sato, Shin Ichiro Miyahara, Yukiko Kawano, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Saburo Hosokawa, Katsutoshi Nagaoka

    Chemical Science   9 ( 8 )   2230 - 2237   2018.1

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    DOI： 10.1039/c7sc05343f

  • X-ray absorption near edge structure and first-principles spectral investigations of cationic disorder in MgAl2O4 induced by swift heavy ions Reviewed

    S. Yoshioka, K. Tsuruta, T. Yamamoto, K. Yasuda, S. Matsumura, N. Ishikawa, E. Kobayashi

    Physical Chemistry Chemical Physics   20 ( 7 )   4962 - 4969   2018.1

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    DOI： 10.1039/c7cp07591j

  • Efficient ammonia synthesis over a Ru/La0.5Ce0.5O1.75 catalyst pre-reduced at high temperature Reviewed

    Yuta Ogura, Katsutoshi Sato, Shin Ichiro Miyahara, Yukiko Kawano, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Saburo Hosokawa, Katsutoshi Nagaoka

    Chemical Science   9 ( 8 )   2230 - 2237   2018

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    DOI： 10.1039/c7sc05343f

  • Cellular microstructures superposed on martensite plates in Mn<inf>55.2</inf>Ga<inf>19.0</inf>Cu<inf>25.8</inf> alloy showing large coercivity Reviewed

    R. Sawada, T. Yamamoto, K. Minakuchi, M. Nagasako, Y. Hayasaka, K. Niitsu, Y. Cho, R. Kainuma, Y. Murakami

    Scripta Materialia   135   33 - 36   2017.7

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    DOI： 10.1016/j.scriptamat.2017.03.013

  • Reply to 'Comments on "evidence of the hydrogen release mechanism in bulk MgH<inf>2</inf>"' Reviewed

    Kazuhiro Nogita, Xuan Q. Tran, Tomokazu Yamamoto, Eishi Tanaka, Stuart D. McDonald, Christopher M. Gourlay, Kazuhiro Yasuda, Syo Matsumura

    Scientific Reports   7   2017.4

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    DOI： 10.1038/srep43720

  • Solid-Solution Alloying of Immiscible Ru and Cu with Enhanced CO Oxidation Activity Reviewed

    Bo Huang, Hirokazu Kobayashi, Tomokazu Yamamoto, Syo Matsumura, Yoshihide Nishida, Katsutoshi Sato, Katsutoshi Nagaoka, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Journal of the American Chemical Society   139 ( 13 )   4643 - 4646   2017.4

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    DOI： 10.1021/jacs.7b01186

  • In-situ investigation of the hydrogen release mechanism in bulk Mg<inf>2</inf>NiH<inf>4</inf> Reviewed

    Xuan Quy Tran, Stuart D. McDonald, Qinfen Gu, Tomokazu Yamamoto, Koji Shigematsu, Kohei Aso, Eishi Tanaka, Syo Matsumura, Kazuhiro Nogita

    Journal of Power Sources   341   130 - 138   2017.2

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    DOI： 10.1016/j.jpowsour.2016.11.105

  • First-Principles Calculation, Synthesis, and Catalytic Properties of Rh-Cu Alloy Nanoparticles Reviewed

    Tokutaro Komatsu, Hirokazu Kobayashi, Kohei Kusada, Yoshiki Kubota, Masaki Takata, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Sato, Katsutoshi Nagaoka, Hiroshi Kitagawa

    Chemistry - A European Journal   23 ( 1 )   57 - 60   2017.1

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    DOI： 10.1002/chem.201604286

  • Discovery of Hexagonal Structured Pd–B Nanocrystals Reviewed

    56 ( 23 )   6578 - 6582   2017

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    We report on hexagonal close-packed (hcp) palladium (Pd)–boron (B) nanocrystals (NCs) by heavy B doping into face-centered cubic (fcc) Pd NCs. Scanning transmission electron microscopy–electron energy loss spectroscopy and synchrotron powder X-ray diffraction measurements demonstrated that the B atoms are homogeneously distributed inside the hcp Pd lattice. The large paramagnetic susceptibility of Pd is significantly suppressed in Pd–B NCs in good agreement with the reduction of density of states at Fermi energy suggested by X-ray absorption near-edge structure and theoretical calculations.

    DOI： 10.1002/anie.201703209

  • Facile synthesis of size-controlled Rh nanoparticles via microwave-assisted alcohol reduction and their catalysis of CO oxidation Reviewed

    Yoshihide Nishida, Katsutoshi Sato, Tomokazu Yamamoto, Dongshuang Wu, Kohei Kusada, Hirokazu Kobayashi, Syo Matsumura, Hiroshi Kitagawa, Katsutoshi Nagaoka

    Chemistry Letters   46 ( 8 )   1254 - 1257   2017

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    DOI： 10.1246/cl.170440

  • Encapsulation of bimetallic metal nanoparticles into robust zirconium-based metal–organic frameworks Evaluation of the catalytic potential for size-selective hydrogenation Reviewed

    Christoph Rösler, Stefano Dissegna, Victor L. Rechac, Max Kauer, Penghu Guo, Stuart Turner, Kevin Ollegott, Hirokazu Kobayashi, Tomokazu Yamamoto, Daniel Peeters, Yuemin Wang, Syo Matsumura, Gustaaf van Tendeloo, Hiroshi Kitagawa, Martin Muhler, Francesc X. Llabrés I Xamena, Roland A. Fischer

    23 ( 15 )   3583 - 3594   2017

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    The realization of metal nanoparticles (NPs) with bimetallic character and distinct composition for specific catalytic applications is an intensively studied field. Due to the synergy between metals, most bimetallic particles exhibit unique properties that are hardly provided by the individual monometallic counterparts. However, as small-sized NPs possess high surface energy, agglomeration during catalytic reactions is favored. Sufficient stabilization can be achieved by confinement of NPs in porous support materials. In this sense, metal–organic frameworks (MOFs) in particular have gained a lot of attention during the last years; however, encapsulation of bimetallic species remains challenging. Herein, the exclusive embedding of preformed core–shell PdPt and RuPt NPs into chemically robust Zr-based MOFs is presented. Microstructural characterization manifests partial retention of the core–shell systems after successful encapsulation without harming the crystallinity of the microporous support. The resulting chemically robust NP@UiO-66 materials exhibit enhanced catalytic activity towards the liquidphase hydrogenation of nitrobenzene, competitive with commercially used Pt on activated carbon, but with superior size-selectivity for sterically varied substrates.

    DOI： 10.1002/chem.201603984

  • Detection of picometer-order atomic displacements in drift-compensated HAADF-STEM images of gold nanorods Reviewed

    Kohei Aso, Koji Shigematsu, Tomokazu Yamamoto, Syo Matsumura

    Microscopy   65 ( 5 )   391 - 399   2016.10

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    DOI： 10.1093/jmicro/dfw018

  • Structure of ion tracks in ceria irradiated with high energy xenon ions Reviewed

    S. Takaki, K. Yasuda, T. Yamamoto, S. Matsumura, N. Ishikawa

    Progress in Nuclear Energy   92   306 - 312   2016.9

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    DOI： 10.1016/j.pnucene.2016.07.013

  • A Synthetic Pseudo-Rh: NO x Reduction Activity and Electronic Structure of Pd-Ru Solid-solution Alloy Nanoparticles Reviewed

    Katsutoshi Sato, Hiroyuki Tomonaga, Tomokazu Yamamoto, Syo Matsumura, Nor Diana Binti Zulkifli, Takayoshi Ishimoto, Michihisa Koyama, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa, Katsutoshi Nagaoka

    Scientific Reports   6   2016.6

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    DOI： 10.1038/srep28265

  • Three-dimensional imaging of a long-period stacking ordered phase in Mg97Zn1Gd2 using high-voltage electron microscopy Reviewed

    Kazuhisa Sato, Shunya Tashiro, Yohei Yamaguchi, Takanori Kiguchi, Toyohiko J. Konno, Tomokazu Yamamoto, Kazuhiro Yasuda, Syo Matsumura

    Materials Transactions   57 ( 6 )   918 - 921   2016.1

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    DOI： 10.2320/matertrans.M2016021

  • A low-crystalline ruthenium nano-layer supported on praseodymium oxide as an active catalyst for ammonia synthesis Reviewed

    Katsutoshi Sato, Kazuya Imamura, Yukiko Kawano, Shin ichiro Miyahara, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Nagaoka

    Chemical Science   8 ( 1 )   674 - 679   2016

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    DOI： 10.1039/C6SC02382G

  • Dual Lewis Acidic/Basic Pd<inf>0.5</inf>Ru<inf>0.5</inf>-Poly(N-vinyl-2-pyrrolidone) Alloyed Nanoparticle: Outstanding Catalytic Activity and Selectivity in Suzuki-Miyaura Cross-Coupling Reaction Reviewed

    Md Shahajahan Kutubi, Katsutoshi Sato, Kenji Wada, Tomokazu Yamamoto, Syo Matsumura, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa, Katsutoshi Nagaoka

    ChemCatChem   7 ( 23 )   3887 - 3894   2015.12

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    DOI： 10.1002/cctc.201500758

  • Hybrid materials of Ni NP@MOF prepared by a simple synthetic method Reviewed

    Megumi Mukoyoshi, Hirokazu Kobayashi, Kohei Kusada, Mikihiro Hayashi, Teppei Yamada, Mitsuhiko Maesato, Jared M. Taylor, Yoshiki Kubota, Kenichi Kato, Masaki Takata, Tomokazu Yamamoto, Syo Matsumura, Hiroshi Kitagawa

    Chemical Communications   51 ( 62 )   12463 - 12466   2015.8

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    DOI： 10.1039/c5cc04663g

  • Preparation of solid-solution type Fe-Co nanoalloys by synchronous deposition of Fe and Co using dual arc plasma guns Reviewed

    Masaaki Sadakiyo, Minako Heima, Tomokazu Yamamoto, Syo Matsumura, Masashi Matsuura, Satoshi Sugimoto, Kenichi Kato, Masaki Takata, Miho Yamauchi

    Dalton Transactions   44 ( 36 )   15764 - 15768   2015.8

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    DOI： 10.1039/c5dt02815a

  • Atomically mixed Fe-group nanoalloys: Catalyst design for the selective electrooxidation of ethylene glycol to oxalic acid Reviewed

    Takeshi Matsumoto, Masaaki Sadakiyo, Mei Lee Ooi, Tomokazu Yamamoto, Syo Matsumura, Kenichi Kato, Tatsuya Takeguchi, Nobuki Ozawa, Momoji Kubo, Miho Yamauchi

    Physical Chemistry Chemical Physics   17 ( 17 )   11359 - 11366   2015.5

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    DOI： 10.1039/c5cp00954e

  • Evidence of the hydrogen release mechanism in bulk MgH<inf>2</inf> Reviewed

    Kazuhiro Nogita, Xuan Q. Tran, Tomokazu Yamamoto, Eishi Tanaka, Stuart D. McDonald, Christopher M. Gourlay, Kazuhiro Yasuda, Syo Matsumura

    Scientific Reports   5   2015.2

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    DOI： 10.1038/srep08450

  • X-ray absorption fine structure investigation of long period stacking ordered structure formation in Mg-Zn-Gd alloys

    Satoru Yoshioka, Tomokazu Yamamoto, Kazuhiro Yasuda, Syo Matsumura

    International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015 PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015   743 - 744   2015.1

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  • Encapsulation of bimetallic nanoparticles into a metal-organic framework: Preparation and microstructure characterization of Pd/Au@ZIF-8 Reviewed

    European Journal of Inorganic Chemistry   2014 ( 32 )   5514 - 5521   2014.11

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    DOI： 10.1002/ejic.201402409

  • An ordered bcc CuPd nanoalloy synthesised via the thermal decomposition of Pd nanoparticles covered with a metal-organic framework under hydrogen gas Reviewed

    Guangqin Li, Hirokazu Kobayashi, Kohei Kusada, Jared M. Taylor, Yoshiki Kubota, Kenichi Kato, Masaki Takata, Tomokazu Yamamoto, Syo Matsumura, Hiroshi Kitagawa

    Chemical Communications   50 ( 89 )   13750 - 13753   2014.10

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    DOI： 10.1039/c4cc05941g

  • Aberration-corrected STEM study on Pt<inf>0.8</inf>Ni de-alloyed nanocatalysts for proton exchange membrane fuel cells Reviewed

    Somaye Rasouli, Jonathan Sharman, Alex Martinez, Dash Fongalland, Graham Hards, Tomokazu Yamamoto, Deborah Myers, Kenji Higashida, Paulo Ferreira

    Microscopy and Microanalysis   20 ( 3 )   480 - 481   2014.8

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    DOI： 10.1017/S1431927614004127

  • Hydrogen storage in Pd nanocrystals covered with a metal-organic framework Reviewed

    Guangqin Li, Hirokazu Kobayashi, Jared M. Taylor, Ryuichi Ikeda, Yoshiki Kubota, Kenichi Kato, Masaki Takata, Tomokazu Yamamoto, Shoichi Toh, Syo Matsumura, Hiroshi Kitagawa

    Nature Materials   13 ( 8 )   802 - 806   2014.8

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    DOI： 10.1038/nmat4030

  • CO<inf>2</inf>-free power generation on an iron group nanoalloy catalyst via selective oxidation of ethylene glycol to oxalic acid in alkaline media Reviewed

    Takeshi Matsumoto, Masaaki Sadakiyo, Mei Lee Ooi, Sho Kitano, Tomokazu Yamamoto, Syo Matsumura, Kenichi Kato, Tatsuya Takeguchi, Miho Yamauchi

    Scientific Reports   4   2014.7

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    DOI： 10.1038/srep05620

  • Shape-dependent hydrogen-storage properties in Pd nanocrystals: Which does hydrogen prefer, octahedron (111) or cube (100)? Reviewed

    Guangqin Li, Hirokazu Kobayashi, Shun Dekura, Ryuichi Ikeda, Yoshiki Kubota, Kenichi Kato, Masaki Takata, Tomokazu Yamamoto, Syo Matsumura, Hiroshi Kitagawa

    Journal of the American Chemical Society   136 ( 29 )   10222 - 10225   2014.7

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    DOI： 10.1021/ja504699u

  • Atomic structure of ion tracks in Ceria Reviewed

    S. Takaki, K. Yasuda, T. Yamamoto, S. Matsumura, N. Ishikawa

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   326   140 - 144   2014.5

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    DOI： 10.1016/j.nimb.2013.10.077

  • Solid solution alloy nanoparticles of immiscible Pd and Ru elements neighboring on Rh: Changeover of the thermodynamic behavior for hydrogen storage and enhanced co-oxidizing ability Reviewed

    Kohei Kusada, Hirokazu Kobayashi, Ryuichi Ikeda, Yoshiki Kubota, Masaki Takata, Shoichi Toh, Tomokazu Yamamoto, Syo Matsumura, Naoya Sumi, Katsutoshi Sato, Katsutoshi Nagaoka, Hiroshi Kitagawa

    Journal of the American Chemical Society   136 ( 5 )   1864 - 1871   2014.2

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    DOI： 10.1021/ja409464g

  • In situ observation of structural transformation of gold nanorods under pulsed laser irradiation in an HVEM Reviewed

    Nao Sumimoto, Koichiro Nakao, Tomokazu Yamamoto, Kazuhiro Yasuda, Syo Matsumura, Yasuro Niidome

    Microscopy   63 ( 4 )   261 - 268   2014.1

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    DOI： 10.1093/jmicro/dfu012

  • Atomistic observation of electron irradiation-induced defects in CeO 2

    Seiya Takaki, Tomokazu Yamamoto, Masanori Kutsuwada, Kazuhiro Yasuda, Syo Matsumura

    2012 MRS Fall Meeting Advances in Materials for Nuclear Energy   93 - 98   2013.11

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    DOI： 10.1557/opl.2013.199

  • Sr-Al-Si co-segregated regions in eutectic Si phase of Sr-modified Al-10Si alloy Reviewed

    M. Timpel, N. Wanderka, R. Schlesiger, T. Yamamoto, D. Isheim, G. Schmitz, S. Matsumura, J. Banhart

    Ultramicroscopy   132   216 - 221   2013.9

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    DOI： 10.1016/j.ultramic.2012.10.006

  • Defect formation and accumulation in CeO2 irradiated with swift heavy ions Reviewed

    K. Yasuda, M. Etoh, K. Sawada, T. Yamamoto, K. Yasunaga, S. Matsumura, N. Ishikawa

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   314   185 - 190   2013.7

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

    DOI： 10.1016/j.nimb.2013.04.069

  • Discovery of face-centered-cubic ruthenium nanoparticles Facile size-controlled synthesis using the chemical reduction method Reviewed

    Kohei Kusada, Hirokazu Kobayashi, Tomokazu Yamamoto, Syo Matsumura, Naoya Sumi, Katsutoshi Sato, Katsutoshi Nagaoka, Yoshiki Kubota, Hiroshi Kitagawa

    Journal of the American Chemical Society   135 ( 15 )   5493 - 5496   2013.4

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    DOI： 10.1021/ja311261s

  • Discovery of face-centered-cubic ruthenium nanoparticles: Facile size-controlled synthesis using the chemical reduction method Reviewed

    Kohei Kusada, Hirokazu Kobayashi, Tomokazu Yamamoto, Syo Matsumura, Naoya Sumi, Katsutoshi Sato, Katsutoshi Nagaoka, Yoshiki Kubota, Hiroshi Kitagawa

    Journal of the American Chemical Society   135 ( 15 )   5493 - 5496   2013.4

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    DOI： 10.1021/ja311261s

  • Atomic structure of ion tracks and microstructure evolution in oxides irradiated with swift heavy ions

    K. Yasuda, T. Yamamoto, S. Takaki, S. Matsumura, N. Ishikawa

    11th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2013 11th International Topical Meeting on Nuclear Applications of Accelerators, AccApp 2013   7 - 11   2013.1

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  • A new phase in stoichiometric Cu <inf>6</inf>Sn <inf>5</inf> Reviewed

    Y. Q. Wu, J. C. Barry, T. Yamamoto, Q. F. Gu, S. D. McDonald, S. Matsumura, H. Huang, K. Nogita

    Acta Materialia   60 ( 19 )   6581 - 6591   2012.11

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    DOI： 10.1016/j.actamat.2012.08.024

  • The role of strontium in modifying aluminium-silicon alloys Reviewed

    M. Timpel, N. Wanderka, R. Schlesiger, T. Yamamoto, N. Lazarev, D. Isheim, G. Schmitz, S. Matsumura, J. Banhart

    Acta Materialia   60 ( 9 )   3920 - 3928   2012.5

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    DOI： 10.1016/j.actamat.2012.03.031

  • Accumulation of radiation damage and disordering in MgAl2O4 under swift heavy ion irradiation

    Kazuhiro Yasuda, Tomokazu Yamamoto, Motoki Etoh, Shinji Kawasoe, Syo Matsumura, Norito Ishikawa

    INTERNATIONAL JOURNAL OF MATERIALS RESEARCH   102 ( 9 )   1082 - 1088   2011.9

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    DOI： 10.3139/146.110564

  • Molecular dynamics simulations of oxygen Frenkel pairs in cerium dioxide Reviewed

    Kenichi Shiiyama, Tomokazu Yamamoto, Tatsuro Takahashi, Aurore Guglielmetti, Alain Chartier, Kazuhiro Yasuda, Syo Matsumura, Kazufumi Yasunaga, Constantin Meis

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   268 ( 19 )   2980 - 2983   2010.10

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    DOI： 10.1016/j.nimb.2010.05.022

  • Frenkel pair accumulation induced crystallization of amorphous MgAl<inf>2</inf>O<inf>4</inf> Reviewed

    Alain Chartier, Tomokazu Yamamoto, Kazuhiro Yasuda, Constantin Meis, Syo Matsumura

    Journal of Nuclear Materials   378 ( 2 )   188 - 192   2008.8

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    DOI： 10.1016/j.jnucmat.2008.06.027

  • Production and stability of radiation-induced defects in MgAl<inf>2</inf>O<inf>4</inf> under electronic excitation Reviewed

    K. Yasuda, T. Yamamoto, S. Seki, K. Shiiyama, S. Matsumura

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   266 ( 12-13 )   2834 - 2841   2008.6

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

    DOI： 10.1016/j.nimb.2008.03.127

  • Molecular dynamics study of Frenkel pairs in cerium dioxide

    Kenichi Shiiyama, Tomokazu Yamamoto, Tatsuro Takahashi, Aurore Guglielmetti, Alain Chartier, Kazuhiro Yasuda, Syo Matsumura, Kazufumi Yasunaga, Constantin Meis

    4th International Conference on Multiscale Materials Modeling, MMM 2008 Proceedings of 4th International Conference on Multiscale Materials Modeling, MMM 2008   598 - 601   2008.1

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    Language：English   Publishing type：Research paper (other academic)  

  • Molecular dynamics simulation of irradiation induced phase transition in MgAl2O4

    Alain Chartier, Tomokazu Yamamoto, Kazuhiro Yasuda, Constantin Meis, Kenichi Shiiyama, Syo Matsumura

    4th International Conference on Multiscale Materials Modeling, MMM 2008 Proceedings of 4th International Conference on Multiscale Materials Modeling, MMM 2008   583 - 588   2008.1

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    Language：English   Publishing type：Research paper (other academic)  

  • The atomic structure of disordered ion tracks in magnesium aluminate spinel Reviewed

    Kazuhiro Yasuda, Tomokazu Yamamoto, Syo Matsumura

    JOM   59 ( 4 )   27 - 30   2007.4

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

    DOI： 10.1007/s11837-007-0050-3

  • Atomic structure and disordering induced by 350 MeV Au ions in MgAl<inf>2</inf>O<inf>4</inf> Reviewed

    K. Yasuda, T. Yamamoto, M. Shimada, S. Matsumura, Y. Chimi, N. Ishikawa

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   250 ( 1-2 SPEC. ISS. )   238 - 244   2006.9

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

    DOI： 10.1016/j.nimb.2006.04.164

  • Microstructure and atomic disordering of magnesium aluminate spinel irradiated with swift heavy ions Reviewed

    T. Yamamoto, M. Shimada, K. Yasuda, S. Matsumura, Y. Chimi, N. Ishikawa

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   245 ( 1 )   235 - 238   2006.4

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    Language：Others   Publishing type：Research paper (other academic)  

    DOI： 10.1016/j.nimb.2005.11.108

  • Influence of an electric field on the microstructure evolution of ion-irradiated alumina Reviewed

    K. Yasuda, K. Tanaka, M. Shimada, T. Yamamoto, S. Matsumura, C. Kinoshita

    Journal of Nuclear Materials   329-333 ( 1-3 PART B )   1451 - 1455   2004.8

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    Language：Others   Publishing type：Research paper (other academic)  

    DOI： 10.1016/j.jnucmat.2004.04.160

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Presentations

  • MEMS隔壁型ガスセルホルダーを用いた触媒材料の反応雰囲気その場STEM観察 Invited

    山本 知一

    日本顕微鏡学会　第65回シンポジウム  2022.11 

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    Event date： 2022.11 - 2023.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：川崎祐宣記念講堂＆大原美術館、倉敷   Country：Japan  

  • ハイエントロピー酸化物ナノ粒子の原子分解能STEM-EDS解析

    山本 知一、鳥山 誉亮、草田 康平、北川 宏、松村 晶、村上 恭和

    日本金属学会 174回講演大会  2024.3 

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    Event date： 2024.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京理科大学葛飾キャンパス   Country：Japan  

  • EDSの基礎 Invited

    山本 知一

    日本顕微鏡学会 第38回分析電子顕微鏡討論会  2023.11 

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    Event date： 2023.11 - 2023.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • 触媒材料の先端電子顕微鏡解析 Invited

    山本 知一

    2023年度電気化学会九州支部シンポジウム「脱炭素社会実現に向けた最先端電気化学デバイスとそれを支える最先端解析技術」  2023.11 

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    Event date： 2023.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Automated STEM analysis of alloy nanoparticle catalysts using object detection with deep learning International conference

    Tomokazu Yamamoto, Youichirou Kawami, Yuma Hamano, Atsuko Sato, Yasukazu Mrakami

    The 20th International Microscopy Congress  2023.9 

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    Event date： 2023.9 - 2024.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Korea, Republic of  

  • RESIREアルゴリズムを用いたナノ粒子の原子分解能トモグラフィー再構成

    山本 知一、村上 恭和

    日本顕微鏡学会 第79回学術講演会  2023.6 

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    Event date： 2023.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • シリカ担持ニッケル触媒のDRM雰囲気におけるその場STEM観察

    山本 知一、川見 洋一郎、松田 潤子、@中越 修、@瓜田 幸幾、松村 晶

    日本金属学会2023年春期(第172回)講演大会  2023.3 

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    Event date： 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京大学　駒場キャンパス   Country：Japan  

  • シリカ担持ニッケル触媒のメタンドライリフォーミング雰囲気におけるその場 STEM観察

    山本 知一, 川見 洋一郎, 松田 潤子, @中越 修, @瓜田幸幾, 松村 晶

    第52回石油・石油化学討論会  2022.10 

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    Event date： 2022.10

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：JA長野県ビル   Country：Japan  

  • メタン・ドライリフォーミング反応雰囲気中における担持型Ni触媒のその場STEM観察

    山本 知一、川見 洋一郎、松田 潤子、松村 晶

    触媒学会 天然ガス転換触媒研究会 第10回 次世代天然ガス利用を考える若手勉強会  2022.10 

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    Event date： 2022.10

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：早稲田大学 西早稲田キャンパス   Country：Japan  

  • Atomic-resolution HAADF-STEM tomography of nanoalloy catalysts Invited International conference

    Tomokazu Yamamoto, Syo Matsumura

    International symposium for young scientist on state-of-the-art electron microscopy  2022.5 

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    Event date： 2022.5

    Language：English   Presentation type：Oral presentation (general)  

    Country：Japan  

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MISC

  • ナノ粒子の電子線トモグラフィーの進展 Reviewed

    山本 知一, 重松 晃次, 麻生 浩平, 松村 晶

    顕微鏡   2018.12

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

  • 原子分解能XEDSマップによる化合物結晶中の添加元素サイトの決定 Reviewed

    山本 知一, 楊 文慧, Xuan Quy Tran , 松村 晶

    顕微鏡   2020.10

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

    DOI： 10.11410/kenbikyo.55.2_65

Professional Memberships

  • Catalysis Society of Japan

  • The Japan Institute of Metals and Materials

  • The Japanese Society of Microscopy

Committee Memberships

  • Organizer   Domestic

    2023.4 - 2024.3   

Research Projects

  • 深層学習を用いた次世代電子線トモグラフィー技術の開発

    2023.10 - 2027.3

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    Authorship：Principal investigator 

  • 結晶界面解析のための原子分解能電子線トモグラフィー技術の開発

    2023.4 - 2026.3

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    Authorship：Principal investigator 

  • 結晶界面解析のための原子分解能電子線トモグラフィー技術の開発

    Grant number：23K13546  2023 - 2025

    日本学術振興会  科学研究費助成事業  若手研究

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    Authorship：Principal investigator  Grant type：Scientific research funding

  • 深層学習を用いた次世代電子線トモグラフィー技術の開発

    2023 - 2024

    戦略的創造研究推進事業 (文部科学省)

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    Authorship：Principal investigator  Grant type：Contract research

  • 革新的多元素ナノ合金触媒・反応場活用による省エネ地域資源循環を実現する技術開発

    2022.3 - 2030.3

  • マテリアル先端リサーチインフラ事業（ハブ機関）

    2021.4

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