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写真a

ワタナベ モトノリ
渡邊 源規
WATANABE MOTONORI
所属
カーボンニュートラル・エネルギー国際研究所 エネルギー変換科学ユニット 准教授
統合新領域学府 オートモーティブサイエンス専攻(併任)
職名
准教授
プロフィール
新規有機材料の開発および機能性有機デバイスに関する研究を行っている。有機材料が有する特性を引き出し、また無機材料と組み合わせることでこれまでにない性質を有する機能性デバイスの開発を目標に研究を行う。有機・無機ハイブリッドによる光触媒・光電子デバイス・有機トランジスタに関する有機材料の開発に取り組んでいる。
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学位

  • 博士(理学)

経歴

  • なし

    なし

  • なし

研究テーマ・研究キーワード

  • 研究テーマ:有機‐無機ハイブリッド型光触媒による二酸化炭素還元

    研究キーワード:ハイブリッド 光触媒 二酸化炭素還元

    研究期間: 2023年4月 - 2025年6月

  • 研究テーマ:有機‐無機ハイブリッド型光触媒の開発

    研究キーワード:界面、有機半導体、無機半導体、光触媒、可視光反応、水分解

    研究期間: 2014年1月 - 2021年4月

  • 研究テーマ:有機半導体の開発と電界効果トランジスタへの展開

    研究キーワード:有機半導体、トランジスタ

    研究期間: 2011年6月 - 2020年4月

受賞

  • Chemical Society Japan Kyushu Branch Autumn research presentation symposium Best poster award

    2020年11月   Chemical Society Japan Kyushu Branch  

  • 平成31年度科学技術分野の文部科学大臣表彰科学技術賞及び若手科学者賞

    2019年4月   文部科学省   有機 - 無機ハイブリッド光触媒による光水分解に関する研究

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    無機光触媒の開発の発展により、水から次世代エネルギー源となる水素を生産する手法が研究されてきたが、未だに高効率な水素生産を示す材料の設計指針は不明瞭である。また、太陽光を自然駆動力として用いる応用は、可視光応答材料が必要不可欠であるが、生体系を模倣した複雑反応系や窒素化などの処理が必要等、限られた反応系・材料のみでしか発現されていなかった。本業績では紫外光~近赤外光まで応答可能な有機半導体材料の新規合成法の開発を行い、有機材料が光触媒へ担持可能な修飾方法を展開し、また光応答により、光触媒水分解による水素生産で必要な電荷移動を行えることを見出した。これを既知・安価な無機光触媒と組み合わせることで、これまでに太陽光の5~6%成分である紫外光しか用いることのできなかった無機光触媒が、太陽光の45%成分である可視光で応答し水から水素を生産することを明らかにし、新たな可視光応答光触媒系を構築した。また、適切な有機材料を無機光触媒材料に組み合わせることで、光触媒の水分解性能を向上する手法を提案した。本業績関連研究では有機半導体や有機色素材料を用い、一貫して太陽電池や光触媒の研究を行っており、非引用文件数が100報を超える論文等世界から注目される研究を行っている。
    本研究成果は、有機-無機ハイブリッド光触媒を用いることで、光触媒水分解における既存の技術的課題に新たな解決策を提示するのみでなく、同様の系での他触媒反応への応用が期待され、本分野において学術的効果が波及すると期待される。

論文

  • Activation of NO with microwave irradiation for low temperature direct decomposition

    Ikoma, Y; Siman, F; Watanabe, M; Inada, M; Takagaki, A; Ishihara, T

    APPLIED CATALYSIS A-GENERAL   687   2024年11月   ISSN:0926-860X eISSN:1873-3875

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    出版者・発行元:Applied Catalysis A: General  

    Direct decomposition of nitric oxide (NO) on metal oxides under microwave (MW) irradiation was investigated and it was found that the most metal oxides show higher NO decomposition activity than that in the conventional electric furnace heating at low temperature. Among the examined oxides, it was found that TiO2, CeO2, ZrO2, and Y2O3 show about 95 % or higher NO conversion at 573 K, and both N2 and O2 are formed with almost equimolar amount. In particular, ZrO2 exhibited high and stable NO decomposition activity more than 25 h. In this study, the influence of coexisting gases on NO decomposition activity on ZrO2 under microwave heating was further investigated and the direct decomposition of NO can be proceeded even in the presence of 5 % O2, 5 % CO2, or humidified condition. Mechanism of high NO decomposition activity under MW irradiation was also studied and it was found that removal of oxygen from the catalyst was much increased under MW irradiation because of direct activation of oxygen and also direct activation of NO which is also suggested by pulse reaction.

    DOI: 10.1016/j.apcata.2024.119965

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  • Enhancing DSSCs and Photocatalytic Hydrogen Production with D-A(1)-A(2)-π-A Sensitizers Containing 10'H-Spiro [Fluorene-9,9'-Phenanthren]-10'-one and Benzo[c][1,2,5]Thiadiazole.

    Li H, Shen XF, Lin YS, Lin YH, Hung YT, Chen NH, Watanabe M, Chang YJ

    Chemistry, an Asian journal   19 ( 19 )   e202400697   2024年10月

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    記述言語:英語  

    DOI: 10.1002/asia.202400697

    PubMed

  • BaZr(Ce,Y)O<sub>3</sub>-Pr-Doped CeO<sub>2</sub> Double Columnar for the Cathodic Functional Layer of Ni-Fe Metal-Supported Protonic Ceramic Fuel Cells

    Kim, HY; Watanabe, M; Song, JT; Inada, M; Ishihara, T

    ACS APPLIED ENERGY MATERIALS   7 ( 18 )   7945 - 7955   2024年9月   ISSN:2574-0962

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    出版者・発行元:ACS Applied Energy Materials  

    Metal-supported protonic ceramic fuel cells were prepared, and the effects of a double columnar layer at the cathode side of BaZr0.44Ce0.36Y0.2O3 (BZCY) on power density and open-circuit voltage (OCV) were studied. The double columnar structure of Pr0.2Ce0.8O2 (PrDC) and BZCY was prepared with pulsed laser deposition. It was found that the insertion of the double columnar layer was highly effective for increasing the power density and OCV. The optimum composition of the double columnar was BZCY:PrDC = 7:3, with a thickness of 200 nm. The power density of PCFCs with the BZCY-PrDC double columnar reached 413 mW/cm2, and the OCV was approximately 1.05 V at 873 K, which is six times higher than that of a cell without a functional layer. The high power density of the cell was attributed to the decreased overpotential of the cathode. Therefore, the BZCY-PrDC double columnar layer is effective in expanding the reaction site by increasing the proton concentration at the cathodic interface.

    DOI: 10.1021/acsaem.4c01529

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  • The effect of hydrophobicity of ruthenium complex dyes on photocatalytic water electrolysis

    Sharif, HM; Shen, XF; Watanabe, M

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   130 ( 8 )   2024年8月   ISSN:0947-8396 eISSN:1432-0630

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    出版者・発行元:Applied Physics A: Materials Science and Processing  

    Bis(2,2′-bipyridine)bis(isothiocyanato)ruthenium complexes are organo-metallic dyes having broad absorption properties in the visible region that are widely used in dye-sensitized opto-electronic devices. Here, we report the photocurrent measurement and stability studies of three Ru-complexes, cis-bis(isothiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylato)ruthenium(II) (N3), its hydrophobic analogues cis-bis(isothiocyanato)(2,2’-bipyridyl-4,4’-dicarboxylato)(4,4’-di-nonyl-2’-bipyridyl)ruthenium(II) (Z-907) and hydrophilic analogues (di-tetrabutylammonium cis-bis(isothiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylato)ruthenium(II), (N719). Z907 shows higher stability and photoelectric conversion efficiency after 2 h analysis than its hydrophilic counter-molecules, N3 and N719. The Z907-TiO2 system exhibited a 1.09 mA/cm2 photocurrent density after 2 h of analysis, with 78% of its performance retained even after an extended 48 h of analysis. The activity of N719-TiO2 and N3-TiO2 sharply decreased after 2 h of analysis, and significant desorption of the dye present on titanium oxide was also observed. This study suggests that hydrophobicity at the electrode-dye interface is a major factor supporting the stability of the dye-sensitized photoanode.

    DOI: 10.1007/s00339-024-07730-1

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  • Nanocomposite of Nb-based binary phase for lowering the activation energy of Li<SUP>+</SUP> intercalation as an anode for high-performance aqueous dual-ion batteries

    Yang, DY; Matsuda, J; Song, JT; Watanabe, M; Ishihara, T

    JOURNAL OF MATERIALS CHEMISTRY A   12 ( 22 )   13338 - 13347   2024年6月   ISSN:2050-7488 eISSN:2050-7496

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    出版者・発行元:Journal of Materials Chemistry A  

    Aqueous dual-ion batteries have good safety, environmental compatibility, and low cost due to the use of an aqueous electrolyte. However, water electrolysis occurs during charging at high potential, resulting in a poor cyclic stability of aqueous dual-ion batteries. Hence, novel anode materials are urgently needed to be developed for aqueous dual-ion batteries with low water electrolysis. A niobium-based binary-phase composite material is reported with a capacity of 135 mA h g−1 at a current density of 0.2 mA cm−2 and with excellent reversibility in the potential range of −1.3-0 V vs. Ag/AgCl. The activation energy of Li+ intercalation was obviously decreased because of the formation of an interface, which enhanced the Li+ intercalation reaction between FeNbO4 and MoNb12O33. In addition, the lower amount of Fe2+ in the lattice of MoNb12O33 caused localized compressive strain, which promoted fast Li+ diffusion in MoNb12O33. A full dual-ion battery of 3.0 V was constructed using the binary-phase niobium-based composite for the anode, and demonstrated a high cycle stability and an average coulombic efficiency of 91% over 300 cycles. Furthermore, considering both the electrolyte and electrode materials, the theoretical energy density of this dual-ion battery was estimated to be 250 W h kg−1, which is close to that of the current Li-ion rechargeable battery.

    DOI: 10.1039/d4ta01293c

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  • High-Pressure Torsion Processing of Serine and Glutamic Acid: Understanding Mechanochemical Behavior of Amino Acids under Astronomical Impacts

    Edalati, K; Hidalgo-Jiménez, J; Nguyen, TT; Watanabe, M; Taniguchi, I

    ADVANCED ENGINEERING MATERIALS   2024年4月   ISSN:1438-1656 eISSN:1527-2648

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    出版者・発行元:Advanced Engineering Materials  

    Astronomical impacts by small solar system bodies (meteoroids, asteroids, comets, and transitional objects) are considered a mechanism for delivering amino acids and their polymerization to proteins in early Earth conditions. High-pressure torsion (HPT) is a new methodology to simulate such impacts and clarify the behavior of biomolecules. Herein, two amino acids, crystalline L-serine and L-glutamic acid that are detected in meteorites, are processed by HPT and examined by ex situ X-ray diffraction, Raman spectroscopy, nuclear magnetic resonance, Fourier-transform infrared spectroscopy, and in situ mechanical shear testing. No polymerization, chemical reactions, or phase transformations are detected after HPT, indicating that the stability and presence of these two amino acids in meteorites are quite reasonable. However, some microstructural and mechanical changes like crystal size reduction to the nanometer level, crystal defect formation, lattice expansion by vacancy formation, and shear strength enhancement to the steady state are found which are similar to the behaviors reported in metals and ceramics after HPT processing.

    DOI: 10.1002/adem.202302267

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  • [FeFe]-Hydrogenase Encapsulated in Zeolitic Imidazolate Framework (ZIF)-8 Nanoparticles as a Robust Biocatalyst for Photocatalytic Hydrogen Production

    Kosem, N; Ohsaki, Y; Watanabe, M; Song, JT; Ishihara, T

    ACS SUSTAINABLE CHEMISTRY & ENGINEERING   12 ( 16 )   6300 - 6309   2024年4月   ISSN:2168-0485

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    出版者・発行元:ACS Sustainable Chemistry and Engineering  

    [FeFe]-hydrogenase (HydA) is an active biocatalytic enzyme for solar-to-hydrogen (H2) conversion. However, stability is a main challenge that limits practical applications. This work aims to encourage the efficiency of HydA by encapsulating it in the zeolitic imidazolate framework-8 (ZIF-8) as a synthetic protective shield. The construction of HydA@ZIF-8 nanoparticles, with an average diameter of 700-1000 nm, at ambient conditions can preserve HydA activity within a spatially confined microenvironment, as characterized by scanning electron microscopy and X-ray diffraction analysis. Based on MV•+-dependent H2 production activity and kinetic analysis, both the stability and efficiency of HydA@ZIF-8 surpass those of free HydA and whole-cell biocatalysts over a wider range of pH and temperature. The achievement of robust HydA@ZIF-8 construction represents a significant step forward in the development of biocatalysts for various future applications.

    DOI: 10.1021/acssuschemeng.3c08560

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  • Surface Modification of NiFe Anode-Support for Thin-Film Solid-Oxide Fuel Cell

    Khan, S; Song, JT; Watanabe, M; Ishihara, T

    ELECTROCHEMISTRY   92 ( 3 )   037005 - 037005   2024年3月   ISSN:13443542 eISSN:21862451

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:公益社団法人 電気化学会  

    A dense NiO-Fe2O3 (NiFe) pellet has been developed as a potential anode-support for thin-film solid oxide fuel cells (SOFCs). However, preparation of dense NiFe is very challenging. Hole-formed NiFe pellets or porous NiFe pellets are frequently formed, which cannot be used as a support (substrate) for thin-film SOFCs. Therefore, this hole-formed NiFe support is simply wasted. In this report, we attempt to re-qualify this NiFe support to be a valuable substrate, which can be used for fabricating thin-film SOFCs. By deposition of smaller NiFe particles to cover the hole-formed NiFe support, the surface of this NiFe pellet is modified. Large holes on the surface disappear. The newly formed NiFe support can be used for fabricating a single cell with La0.9Sr0.1Ga0.8Mg0.2O3−δ as thin-film electrolyte operated at intermediate temperature. Maximum power density generated from this cell is 0.45, 0.86 and 1.28 W cm−2 at 873, 923 and 973 K, respectively. (Figure Presented).

    DOI: 10.5796/electrochemistry.23-00164

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  • Photobiocatalytic conversion of solar energy to NH<sub>3</sub> from N<sub>2</sub> and H<sub>2</sub>O under ambient condition

    Kosem, N; Shen, XF; Ohsaki, Y; Watanabe, M; Song, JT; Ishihara, T

    APPLIED CATALYSIS B-ENVIRONMENTAL   342   123431 - 123431   2024年3月   ISSN:0926-3373 eISSN:1873-3883

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Applied Catalysis B: Environmental  

    NH3 is an important chemical fertilizer and expecting as H2 carrier. Several methods have been investigated for eco-friendly NH3 production under mild conditions instead of Haber-Bosch process using 400 °C, 20 MPa. Here, cyanobacterial Anabaena variabilis was utilized as a nitrogenase-producing biocatalyst that converts N2/H2O to NH3 under ambient conditions. Biocatalytic reactions revealed that MV•+ can penetrate cell membrane and transfer electrons generated in inorganic photocatalyst. We first reported photobiocatalytic NH3 production of cyanobacteria and TiO2. Comparing with natural system, NH3 formation rate of the hybrid system increased 81.3 times with an initial rate of 2031.7 nmol·h−1 and turnover number of 216.8.

    DOI: 10.1016/j.apcatb.2023.123431

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  • Controlled Pore Size of NiO-YSZ Tubular Substrate for Improved Performance of Reversible Solid Oxide Cell Using LaGaO<sub>3</sub> Electrolyte Film

    Liu, B; Zhe, T; Kim, S; Song, JT; Watanabe, M; Ishihara, T

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   171 ( 2 )   024504 - 024504   2024年2月   ISSN:0013-4651 eISSN:1945-7111

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of the Electrochemical Society  

    Effects of channel size in NiO-YSZ porous substrate were studied on power density in solid oxide fuel cell mode and electrolysis current in steam electrolysis mode. It was found that the cell deposited on anode substrate with larger pore diameter shows a superior performance. The LSGM cell prepared on Ni-YSZ tube with average channel diameter of ca. 2.5 μm shows the maximum power density of 0.36 W cm−2 in SOFC mode and 0.42 A cm−2 at 1.6 V in SOEC mode at 873 K. Spike potential noise which may be caused by insufficient gas diffusion in NiO-YSZ porous substrate was observed under constant current electrolysis condition in case of NiO-YSZ tube with narrow channel and the spike noise is suppressed by increasing channel size. NiO-YSZ tube with large channel size is also effective for increasing long term stability in electrolysis mode.

    DOI: 10.1149/1945-7111/ad2815

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    その他リンク: https://iopscience.iop.org/article/10.1149/1945-7111/ad2815/pdf

  • Enhanced charge mediator properties of photocatalysts with reduced graphene nanoribbons for photocatalytic acceleration of hydrogen production in aqueous media

    Morita, R; Murakami, Y; Shen, XF; Yang, DY; Watanabe, M; Song, JT; Takagaki, A; Ishihara, T

    JOURNAL OF MATERIALS CHEMISTRY C   12 ( 5 )   1652 - 1660   2024年2月   ISSN:2050-7526 eISSN:2050-7534

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Materials Chemistry C  

    In this study, a hybrid photocatalyst with titanium oxide using reduced graphene nanoribbons (rGNR) was fabricated. The resulting 0.5 wt% platinum-loaded titanium oxide-supported reduced GNRs (Pt/TiO2/rGNR) exhibited an activity of 2.54 mmol h−1 g−1 which is 6.35 times higher than the 0.40 mmol h−1 g−1 of the titanium oxide photocatalyst. This activity was also higher than that of the starting material, multi-walled carbon nanotube (MWCNT)-supported titanium oxide (Pt/TiO2/MWCNT) as 0.80 mmol h−1 g−1. The resulting catalysts were characterized by X-ray photoelectron spectroscopy (XPS) and fluorescence lifetime spectroscopy, and the GNRs chemically reduced by NaBH4 (rGNR) had higher conductivity than the GNRs reduced by photogenerated electrons (pGNR) from titanium oxide. It was found using the photocatalytic reaction and photocurrent test that almost no photoresponsivity of reduced GNR character was exhibited. This result clarified that the reduced GNRs played the role of a mediator that promotes charge separation between photocatalysts and that effective hydrogen production in water was achieved.

    DOI: 10.1039/d3tc03622g

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  • Visible light driven hydrogen peroxide production by oxygen and phosphorus co-doped CoP-C<sub>3</sub>N<sub>4</sub> photocatalyst

    Jinguji, K; Watanabe, M; Morita, R; Takaoka, Y; Hossain, MS; Song, JT; Takagaki, A; Matsuda, J; Ishihara, T

    CATALYSIS TODAY   426   114400 - 114400   2024年1月   ISSN:0920-5861 eISSN:1873-4308

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Catalysis Today  

    Photocatalytic hydrogen peroxide (H2O2) by oxygen and phosphorus co-doped graphitic carbon nitride (C3N4) with cobalt phosphate (CoP) cocatalyst is investigated. The photocatalyst powder of CoP-C3N4 1:n, n = 0–4, n is the weight ratio of cyanuric acid added) was synthesized by melamine cyanurate template method. Characterization of the catalyst was performed by X-ray diffraction analysis, and scanning electron microscopy, X-ray photoemission spectra, and fluorescence decay spectra. Oxygen doping was performed by the melamine and cyanuric acid template method, followed by phosphorus doping of the C3N4 backbone by the introduction of CoP. Co-doping of O and P atom facilitated charge transfer on the C3N4 backbone, while CoP facilitated charge separation at the C3N4 interface. The CoP-C3N4 (1:4) photocatalyst increased H2O2 production rate by 293 % compared to that of the cyanuric acid-free photocatalyst and also achieved the photocatalytic oxygen evolution from water. These results indicate that O,P co-doped CoP-C3N4 can perform sacrificial agent-free hydrogen peroxide under visible light irradiation.

    DOI: 10.1016/j.cattod.2023.114400

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  • Sensitizers D-A<inf>1</inf>-A<inf>2</inf>-π-A Include 10'H-Spiro[fluorene-9,9'-Phenanthren].Benzo[c] and -10'-one.[ 1, 2, 5]Thiadiazole for Photocatalytic Hydrogen Production and Dye-Sensitized Solar Cells

    Li H., Shen X.F., Lin Y.S., Lin Y.H., Chen N.H., Hung Y.T., Watanabe M., Chang Y.J.

    2024 31st International Workshop on Active-Matrix Flatpanel Displays and Devices, AM-FPD 2024   127 - 130   2024年   ISBN:9784991216961

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    出版者・発行元:2024 31st International Workshop on Active-Matrix Flatpanel Displays and Devices, AM-FPD 2024  

    The structural modifications prevent molecular aggregation by adding a bulky spiro[fluorene-9,9'-phenanthrene ]-10' auxiliary acceptor (A1) and benzo[c][1,2,5]thiadiazole (A2) between the donor and π-bridge moiety. Additionally, the carbonyl group improves the capture of Li+ ions, delaying charge recombination. Moreover, sensitizer FZ-2's light absorption range is expanded and its energy conversion efficiency is improved under AM1.5 circumstances, reaching up to 5.72%, thanks to the enlarged π-conjugation. Co-sensitization testing under one sun revealed an effectiveness of 9.60% using N719 and FZ-2. Due to FZ-2's strong absorption efficiency at short wavelengths, which offsets N719's inadequacies in this range, the co-sensitization performance of FZ-2 and N719 is superior. Additionally, FZ-sensitizers demonstrate excellent photocatalytic hydrogen production efficiency. The hydrogen production activities of FZ-1 are 7430 μmol/g (1 hour) and 64004 μmol/g (12 hours), FZ-2 hydrogen production activities are 9190 μmol/g (1 hour) and 76582 μmol/g (12 hours). This suggests that FZ-2 is more effective at injecting charges into TiO2 and using them for water splitting. After 12 hours of photocatalytic water splitting stability tests, FZ-1 and FZ-2 exhibited TON of 4249 and 5378, respectively.

    DOI: 10.23919/AM-FPD61635.2024.10615532

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  • Oxide ion conductivity in doped bismuth gallate mullite type oxide, Bi2Ga4O9

    Kluczny, M; Nguyen, T; Song, JT; Watanabe, M; Takagaki, A; Staykov, A; Ishihara, T

    SOLID STATE IONICS   401   116343 - 116343   2023年11月   ISSN:0167-2738 eISSN:1872-7689

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Solid State Ionics  

    Mullite-phase bismuth gallate (Bi2Ga4O9) was successfully synthesized with partial substitution of bismuth with alkaline-earth cation, Mg2+, Ca2+, Sr2+, and Ba2+. The effect of this substitution on the electrical conductivity was investigated. In this study, substitution with Ca2+ of Bi site was further studied for increasing the ionic conductivity as well as the phase stability in reducing atmospheres. Substitution with Ca2+ was found to be the most effective and with 12.5 mol% of Ca2+ as the optimized doping amount. Conductivity and stability in reducing atmospheres was increased down to pO2 ≤ 10−19 atm while keeping the conductivity of σ = 2.6 × 10−2 S·cm−1 at 973 K largely independent of oxygen partial pressure. Oxygen permeation analysis estimates 76% of theoretical oxygen permeation rate at 973 K suggesting main charge carrier is oxide ion. Partial electronic conductivity was measured with the ion blocking method. Oxide ion conductivity is dominated over wide pO2 range excepting for hole conduction at high pO2. Density functional theory (DFT) analysis on oxide ion diffusion route suggests oxygen hoping through lattice vacancy is main pathway for oxide ion conductivity in this doped Bi2Ga4O9. Despite the low oxide ion conductivity in Mullite-phase oxide, it was found that Ca doped Bi2Ga4O9 shows good oxide ion conductivity over wide pO2 range.

    DOI: 10.1016/j.ssi.2023.116343

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  • The acceleration of BODIPY dye-sensitized photocatalytic hydrogen production in aqueous ascorbic acid solutions using alkyl-chain formed second coordination sphere effects

    Shen, XF; Watanabe, M; Song, JT; Takagaki, A; Abe, T; Tanaka, K; Ishihara, T

    JOURNAL OF MATERIALS CHEMISTRY A   11 ( 39 )   21153 - 21160   2023年10月   ISSN:2050-7488 eISSN:2050-7496

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Materials Chemistry A  

    BODIPY (boron-dipyrromethene) compounds are extensively utilized in various applications. Typically, their activity is modified by altering the functional groups at the α-, β-, and meso-positions of the substituents. However, no systematic information has been provided regarding the effects of substituted F- positions and hydrophobicity on the activity of BODIPY sensitizers in photosensitizing chemistry. Dyes (7a-7c) with different alkyl chain lengths were synthesized and compared with the unsubstituted compound 3 to discuss the effects of -F position substituents and the hydrophobicity of BODIPY dyes on photocatalytic activity. Density functional theory (DFT) calculations showed that -F-substitution induced an intramolecular charge transfer (ICT) effect, enhancing visible-light absorption. Longer alkyl chains provided a favourable second coordination sphere reaction environment for hydrogen production. Experimentally, dye 7c demonstrated the highest activity, with a hydrogen production rate of 496.5 μmol gcat−1 h−1, which is 3 times higher than that of 3, and a 9.6 times higher turnover frequency (TOF) than that of 3. The apparent quantum yield (AQY) at 650 nm was 1.4%. This study highlights the importance of -F position substitution and optimizing hydrophobicity to enhance the photocatalytic activity of metal-free organic dyes through the creation of a new second coordination sphere.

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  • Pronounced Strain Effects on Oxygen Dissociation; Pt- or Au-Dispersed Pr<sub>2</sub>Ni(Cu, Ga)O<sub>4</sub> for Active Cathode of Solid Oxide Fuel Cells

    Kim, SJ; Watanabe, M; Ishihara, T

    ADVANCED ENERGY AND SUSTAINABILITY RESEARCH   4 ( 10 )   2023年10月   ISSN:2699-9412 eISSN:2699-9412

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Advanced Energy and Sustainability Research  

    The correlation between lattice strain induced by metal dispersion into grain and the cathodic overpotential is studied for increasing oxygen-dissociation activity and improving power density of solid oxide fuel cells (SOFC) at decreased temperature. Pt or Au dispersion in Pr1.90Ni0.71Cu0.21Ga0.05O4+d (PNCG) is prepared and the 3D tensile strain is successfully induced after sintering by a mismatch in thermal expansion coefficient. Due to higher hardness and melting temperature, Pt dispersion into bulk of PNCG introduces larger tensile strain than that by Au at the same amount. In particular, at 1 mol% Pt dispersion, large tensile strain of 0.67% is induced. Overpotential of 1 mol% Pt-PNCG cathode is 8 times smaller (35 mV) than that of PNCG (270 mV) at 800 °C and 300 mA cm−2, and it is found that the cathodic overpotential of PNCG is decreased with tensile strain on both Pt and Au dispersion. This cathodic activity enhancement appears to be related with the increased diffusivity of oxide ion in PNCG. In this study, cathodic overpotential is more significantly influenced by the induced tensile strain comparing with the intrinsic catalytic activity of the dispersed metal.

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  • Proton conductivity in Yb-doped BaZrO3-based thin film prepared by pulsed laser deposition

    Niwa, E; Kluczny, M; Kim, HY; Song, JT; Watanabe, M; Takagaki, A; Ishihara, T

    SOLID STATE IONICS   396   2023年8月   ISSN:0167-2738 eISSN:1872-7689

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Solid State Ionics  

    For increasing the performance of PCFC (Protonic Ceramic Fuel Cells), it is important to prepare high-quality thin films of electrolyte materials. In this study, the preparation condition of the thin film of BaZr0.8Yb0.2O2.9 (BZYb) by pulsed laser deposition (PLD) method was optimized and the electrical conductivities of the obtained films were measured. The thin film was prepared by PLD using two kinds of BZYb targets, which were prepared by solids state reaction and Pechini method. Both thin-film samples have the single phase of the cubic perovskitetype structure, however, morphology as well as the orientation of the BZYb film was significantly different. The thin film using the target material by Pechini method is a high crystalline orientation and partially oriented [211] direction. The electrical conductivities of the obtained thin films at reduction atmosphere are dominated by proton conductivity, which is almost the same as that of the bulk sample despite [211] orientation.

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  • Bi/UiO-66-derived electrocatalysts for high CO2-to-formate conversion rate

    Takaoka, Y; Song, JT; Takagaki, A; Watanabe, M; Ishihara, T

    APPLIED CATALYSIS B-ENVIRONMENTAL   326   122400 - 122400   2023年6月   ISSN:0926-3373 eISSN:1873-3883

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    記述言語:その他   掲載種別:研究論文(学術雑誌)   出版者・発行元:Applied Catalysis B: Environmental  

    In the CO2 electrocatalytic reduction reaction (CO2RR) technology, high CO2 conversion rate is highly required for efficient CO2 utilization from the CO2 resource. In this study, we propose the strategy of combining UiO-66 metal organic framework (MOF) structure with Bi electrocatalyst for highly active CO2RR with selective formic acid production. The synthesized Bi/UiO-66 catalyst shows superior CO2 reduction property, 4.6 times higher current density at −0.7 V vs. reversible hydrogen electrode (RHE) than bare Bi without UiO-66 despite of low electrochemical surface area. Also, NH2 functionalized UiO-66 shows almost no effect on CO2RR as compared to without NH2 probably due to disassembled linkers during CO2RR. Various characterizations such as Fourier transform infrared (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) indicate carbonate species captured form of CO2 at Zr-MOF site should contribute the high CO2 conversion rate. Our findings demonstrate the feasibility of Zr-MOF as a Supporting material to achieve efficient CO2 reduction.

    DOI: 10.1016/j.apcatb.2023.122400

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  • Hybridizing Tetraglyme to Aqueous Electrolyte with Concentrated Salts Promote Intercalation of Anions on Graphite Cathode in Dual-Ion Battery

    Yang Dengyao, Watanabe Motonori, Ishihara Tatsumi

    Small Methods   7 ( 9 )   2300249   2023年5月   eISSN:23669608

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    記述言語:英語  

    The amount of support salt in electrolytes determines the capacity of a dual-ion battery (DIB), and highly concentrated electrolytes are required for developing the high energy density DIB. In this study, hybrid aqueous tetraglyme (G4) electrolyte is investigated to develop high energy density aqueous DIB that is composed of carbon and Mo_6S_8 for cathode and anode, respectively. Impedance measurement reveals that introduced G4 increases the activation energy of the anode; however, decreases the activation energy for anion intercalation into the carbon cathode. This decreases the activation energy resulted from the G4 molecule strongly solvated to Li^+ resulting in weakening anion trapped in “contact ion pair” in concentrated aqueous electrolyte. So, hybrid G4-aqueous electrolyte is useful for better electrochemical intercalation of anion. In addition, this hybrid electrolyte is highly stable by formation of stable solid electrode–electrolyte interphase on Mo_6S_8 anode and discharge capacity of 37 mAh g^<−1>, and 72% retained capacity after 500 cycles with a high average coulombic efficiency of 93% is achieved.

    CiNii Research

  • Hybridizing Tetraglyme to Aqueous Electrolyte with Concentrated Salts Promote Intercalation of Anions on Graphite Cathode in Dual-Ion Battery

    Yang, DY; Watanabe, M; Ishihara, T

    SMALL METHODS   7 ( 9 )   e2300249   2023年5月   ISSN:2366-9608

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Small Methods  

    The amount of support salt in electrolytes determines the capacity of a dual-ion battery (DIB), and highly concentrated electrolytes are required for developing the high energy density DIB. In this study, hybrid aqueous tetraglyme (G4) electrolyte is investigated to develop high energy density aqueous DIB that is composed of carbon and Mo6S8 for cathode and anode, respectively. Impedance measurement reveals that introduced G4 increases the activation energy of the anode; however, decreases the activation energy for anion intercalation into the carbon cathode. This decreases the activation energy resulted from the G4 molecule strongly solvated to Li+ resulting in weakening anion trapped in "contact ion pair" in concentrated aqueous electrolyte. So, hybrid G4-aqueous electrolyte is useful for better electrochemical intercalation of anion. In addition, this hybrid electrolyte is highly stable by formation of stable solid electrode-electrolyte interphase on Mo6S8 anode and discharge capacity of 37 mAh g(-1), and 72% retained capacity after 500 cycles with a high average coulombic efficiency of 93% is achieved.

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  • Controlled Solvation Structure of a Zn Ion in an Aqueous Electrolyte by Amine Additives for Long Cycle Life of a Large Capacity Zn-Air Rechargeable Battery

    Ishihara, T; Inoishi, Y; Kim, S; Staykov, A; Watanabe, M; Naohara, N; Takahashi, K; Itoh, T

    JOURNAL OF PHYSICAL CHEMISTRY C   127 ( 14 )   6619 - 6628   2023年4月   ISSN:1932-7447 eISSN:1932-7455

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Physical Chemistry C  

    A rechargeable Zn-air battery is expected as a large capacity battery alternative to the Li ion battery; however, short cycle life is the current issue. In this study, it was found that the addition of 3,3-diaminodipropylamine was effective for preventing the formation of a Zn dendrite in the anode resulting in a long cycle life with more than 300 cycles and a discharge capacity larger than 700 mAh/g (>85% Zn used for discharge) when Ni0.8Fe0.2Co2O4 and 8 M KOH-H2O were used for the air electrode and electrolyte, respectively. The increased cycle stability could be assigned to the change in the solvated structure of Zn2+ in the electrolyte by the strong interaction between 3,3-diaminodipropylamine and solvated water, which is suggested by Raman and Fourier transform infrared spectroscopic analyses. Ab initio molecular dynamics simulations suggest that the amine is strongly interacted with OH of solvated water molecules and changes the coordination number of Zn2+, and as result, the size of the solvated Zn2+ cluster was increased, resulting in enhanced Zn2+ mobility in the electrolyte for the uniform deposition of Zn on the anode during charge by increased mobility.

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  • A comprehensive study on rational biocatalysts and individual components of photobiocatalytic H2 production systems

    Kosem, N; Watanabe, M; Song, JT; Takagaki, A; Ishihara, T

    APPLIED CATALYSIS A-GENERAL   651   2023年2月   ISSN:0926-860X eISSN:1873-3875

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Applied Catalysis A: General  

    Photobiocatalytic system has been developing as a promising approach for H2 production. Herein, the rational characteristics of biocatalysts and the role of individual components affecting the efficiency of the system were investigated. Photocatalytic studies showed that tris (2-amino-2-hydroxymethyl-1,3-propanediol) was an ideal electron donor for viologen reduction by TiO2. Biocatalytic reaction revealed that cell permeability, the redox potential of electron mediators and the cell envelope were crucial to the activity of whole-cell biocatalysts. In photobiocatalytic system, recombinant Escherichia coli with a turnover frequency of 39.43 +/- 3.77 s-1 based on [FeFe]-hydrogenase activity was a more rational biocatalyst than Anabaena variabilis. A comprehensive study found that the presence of TiO2, light and biocatalysts strongly enhanced H2 production, whereas Tris and MV2+ had less influence. A maximum rate was found at 16.73 +/- 1.03 mu mol/min with a solar-to-H2 conversion of 1.58 +/- 0.10 %. Understanding the role of each component will guide the development of high-efficient photobiocatalysis.

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  • Pyridyl anchoring squaraine as a near-infrared dye sensitizer for effective sensitized hydrogen production over a titanium dioxide photocatalyst in water medium

    Shen, XF; Watanabe, M; Takagaki, A; Song, JT; Abe, T; Kawaguchi, D; Tanaka, K; Ishihara, T

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   129 ( 1 )   2023年1月   ISSN:0947-8396 eISSN:1432-0630

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Applied Physics A: Materials Science and Processing  

    Squaraine dyes are organic dyes having strong and narrow absorption properties in the near-infrared region that are widely used in photovoltaic and biomedical applications. In this work, squaraine dye (SA1) was synthesized as a dye sensitizer for a dye-sensitized photocatalytic system, which was composed of SA1 and Pt-loaded TiO2 powder photocatalyst (SA1/Pt-TiO2). The SA1/Pt-TiO2 system exhibited a good hydrogen production performance within 150 h and an apparent quantum yield of 1.4% under 800 nm monochromatic light irradiation. However, during the photocatalytic reaction, the photocatalytic activity of SA1/Pt-TiO2 decreased due to photodecomposition. Ultraviolet-visible absorption spectroscopy, H-1 nuclear magnetic resonance spectroscopy, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry measurements were performed to investigate the mechanism of the decomposition of the squaraine moiety of SA1, the decomposition process, and the structure of the decomposed material. The results show that even without the Pt-loaded TiO2 powder photocatalyst, SA1 undergoes photodissociation, which cleaves the bond between the indoline moiety and the square acid.

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  • A case report of anti-N-methyl-D-aspartate receptor encephalitis with chromosomally integrated human herpesvirus 6

    Iwao, K; Watanabe, M; Mukaino, T; Fujii, T; Yamasaki, R; Isobe, N

    NEUROLOGY AND CLINICAL NEUROSCIENCE   11 ( 1 )   52 - 54   2023年1月   ISSN:2049-4173

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  • High Voltage and Capacity Dual-Ion Battery Using Acetonitrile-Aqueous Hybrid Electrolyte with Concentrated LiFSI-LiTFSI

    Yang, D; Watanabe, M; Takagaki, A; Ishihara, T

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   169 ( 12 )   2022年12月   ISSN:0013-4651 eISSN:1945-7111

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of the Electrochemical Society  

    Water-acetonitrile (AN) hybrid electrolyte with high concentration of bis(trifluoromethanesulfonyl) imide (LiTFSI) and Lithium bis(fluorosulfonyl) imide (LiFSI) (LiTFSI-LiFSI=3:1, molar ratio) supporting salts are studied for the high potential and large capacity rechargeable dual-ion battery. Water-acetonitrile hybrid electrolyte (WA) shows a wide electrochemical stability window of 3.1 V in 20 m aqueous electrolyte and 3.6 V in 20 m 9LiFSI-1LiTFSI in water: AN=1:3 molar ratio electrolyte. In particular, high oxidation potential, which can be assigned to the strong solvated ionic cluster formed between AN, water and LiTFSI-LiFSI supporting salts. The dual-ion battery is assembled using the graphitic carbon (KS6) and the activated carbon (AC) as cathode and anode, respectively, and 20 m LiTFSI-LiFSI in hybrid AN-water as electrolyte. It is found that the reasonably large capacity, coulombic efficiency and cycle stability were achieved. The KS6/AC cell shows 86 mAh g(-1) at the initial cycle and 50 mAh g(-1) at 100th cycle in a voltage range of 0-3.25 V, and the average coulombic efficiency of 85% is sustained over 200 cycles. The solvated structure of water to Li+ is strengthened by addition of AN from ATR-IR and NMR spectrums analysis and this change in the solvated structure is the main reason for the increased performance of the aqueous dual-ion battery.

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  • Solvated Structure of Hybrid Tetraglyme-Aqueous Electrolyte Dissolving High-Concentration LiTFSI-LiFSI for Dual-Ion Battery

    Yang, DY; Li, H; Shen, XF; Watanabe, M; Ishihara, T

    CHEMSUSCHEM   16 ( 4 )   e202201805   2022年12月   ISSN:1864-5631 eISSN:1864-564X

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ChemSusChem  

    The solvated structure of a highly concentrated hybrid tetraglyme (G4)-water electrolyte was studied for an increasing cycle stability and performance of a KS6 used dual-ion battery. Hybrid solvent of G4 and water with a weight ratio of 2 to 8 was able to dissolve 9LiFSI-1LiTFSI supporting salts up to 37 mol kg(-1) (37 mol kg(-1) G2W8). In spite of such high concentration of supporting salts, reasonable charge and discharge performance of dual-ion battery (discharge capacity of approximate to 40 mAh g(-1) and coulombic efficiency of 90 %) were exhibited over 300 cycles. This was attributed to the decreased hydrogen evolution reaction (HER) potential to -1.05 V vs. Ag/AgCl by addition of G4. From Fourier-transform infrared, nuclear magnetic resonance, and Raman spectroscopies, G4 molecules were more strongly coordinated to Li+ to form ion pairs of [Li(G4)(x)(H2O)(y)](+) complex in hybrid G4-water electrolyte. Co-intercalation of bis(trifluoromethanesulfonyl)imide (TFSI-) and bis(fluorosulfonyl)imide (FSI-) into graphitic carbon KS6 cathode was confirmed in hybrid aqueous electrolyte.

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  • Significant CO<sub>2</sub> photoreduction on a high-entropy oxynitride

    Akrami, S; Edalati, P; Shundo, Y; Watanabe, M; Ishihara, T; Fuji, M; Edalati, K

    CHEMICAL ENGINEERING JOURNAL   449   2022年12月   ISSN:1385-8947 eISSN:1873-3212

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Chemical Engineering Journal  

    CO(2 )photoreduction on photocatalysts is a nature-friendly solution to decrease the CO2 amount, but the method still has low efficiency because of difficult separation and easy recombination of charge carriers in available catalysts. In this study, a high-entropy oxynitride was introduced as an active photocatalyst for photoreduction. The material had a chemical composition of TiZrNbHfTaO6N3 and was produced by a high-pressure torsion method followed by oxidation and nitriding. It showed higher photocatalytic CO2 to CO conversion compared to corresponding high-entropy oxide, benchmark photocatalyst P25 TiO2, and almost all catalysts introduced in the literature. The high activity of this oxynitride, which also showed good chemical stability, was attributed to the large absorbance of light and easy separation of electrons and holes, the low recombination of charge carriers, and the high CO(2 )adsorption on the surface. These findings introduce high-entropy oxynitrides as promising photocatalysts for CO(2 )photoreduction.

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  • Introduction of tensile strain into titanium dioxide for increased solid acid catalytic activity

    Takagaki, A; Ozaki, T; Song, JT; Niwa, E; Watanabe, M; Ishihara, T

    CATALYSIS SCIENCE & TECHNOLOGY   12 ( 21 )   6359 - 6362   2022年10月   ISSN:2044-4753 eISSN:2044-4761

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Catalysis Science and Technology  

    Strained metal oxides are known to exhibit improved activity for redox and photocatalytic reactions. Here, we intentionally introduced tensile strain into rutile-type TiO2 by utilizing the difference in thermal expansion coefficients between TiO2 and Au and applied it as a solid acid catalyst. It was demonstrated that its acid catalytic activity in the acetalization of furfural was enhanced by increasing the degree of the strain introduced.

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  • アルミナ担持白金触媒を用いたメタンと一酸化窒素によるシアン化水素合成における粒子径効果

    山﨑 達也, 高垣 敦, 宍戸 哲也, 阪東 恭子, 小平 哲也, 村上 純一, 丹羽 栄貴, 渡邊 源規, 石原 達己

    Journal of the Japan Petroleum Institute   65 ( 5 )   184 - 191   2022年9月   ISSN:13468804 eISSN:1349273X

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:公益社団法人 石油学会  

    <p>白金担持アルミナ上で,一酸化窒素(NO)を酸化剤としてメタンをシアン化水素(HCN)に変換する際の白金ナノ粒子の粒径効果について検討した。担持量と焼成温度を制御することにより,1.6〜4.1 nmの範囲で様々な平均粒子径のPt触媒を得ることができた。Pt表面サイト量はパルス法によるCO滴定で決定し,触媒活性は同一接触時間下で評価した。Pt の粒子が小さい触媒(1.6〜3.2 nm)では,NO 転化率が粒子径の大きい触媒よりも低いことが分かった。粒子径の大きな触媒(4.1〜4.2 nm)は,10 wt% Pt/Al<sub>2</sub>O<sub>3</sub> において 400 ℃で 収率1.3 %(炭素ベース)で高い HCN 選択率(53.5 %)を示した。大きなPt粒子が高い活性を示す理由の一つは,金属と担体の界面で進行するHCNから二酸化炭素とアンモニアへの逐次反応を抑制したためと思われる。Pt L<sub>3</sub>端X線吸収微細構造(XAFS)スペクトルから,反応試験後の小粒子触媒はPt–CN種で覆われていることが分かった。一方,大粒子触媒ではPt–COが主な吸着種として観測され,大粒子触媒の方がHCN脱離が容易であることが示唆された。</p>

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  • Enhanced CO<sub>2</sub> conversion on highly-strained and oxygen-deficient BiVO<sub>4</sub> photocatalyst

    Akrami, S; Murakami, Y; Watanabe, M; Ishihara, T; Arita, M; Guo, QX; Fuji, M; Edalati, K

    CHEMICAL ENGINEERING JOURNAL   442   2022年8月   ISSN:1385-8947 eISSN:1873-3212

  • [2.2]- and [3.3]Paracyclophane as Bridging Units in Organic Dyads for Visible-Light-Driven Dye-Sensitized Hydrogen Production

    Watanabe, M; Ono, Y; Ishihara, T; Chang, YJ; Shibahara, M

    CHEMISTRY-A EUROPEAN JOURNAL   28 ( 43 )   e202200790   2022年8月   ISSN:0947-6539 eISSN:1521-3765

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Chemistry - A European Journal  

    Novel donor-acceptor dyads containing [2.2]- and [3.3]paracyclophane (PCP) as the bridging moiety were synthesized and used to effectively fabricate dye-sensitized hydrogen production systems. All the prepared compounds had a phenothiazine and a cyanoacrylic acid/pyridinyl acrylonitrile moiety acting as an electron donor and acceptor, respectively. Although cyclic voltammetry measurements showed similar electron-donating properties among all the synthesized dyads, the lowest absorption energy of the [2.2]PCP moiety was lower than that of the [3.3]PCP one; this was due to its shorter distance between benzene rings, which could effectively drive the charge transfer between the donor and acceptor chromophores. Under visible light (>395 nm), a dyad-loaded photocatalyst in a 0.5 M aqueous glycerol solution generated detectable hydrogen gases. The optimal turnover number and photocurrent order exhibited the same trend as the hydrogen production rate since the suggested number of excited photons played a critical role in hydrogen production.

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  • Photocatalytic Water Splitting on KTa(Zr)O<sub>3</sub> Modified with Acene-Based Organic Semiconductors

    Hagiwara, H; Watanabe, M; Kim, S; Higashi, K; Ishihara, T

    JOURNAL OF PHYSICAL CHEMISTRY C   126 ( 23 )   9634 - 9641   2022年6月   ISSN:1932-7447 eISSN:1932-7455

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Physical Chemistry C  

    The modification effect of acene dyes such as 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-PEN) and difuranoan-thracene derivatives on the photocatalytic water splitting activity of Pt-loaded KTa(Zr)O-3 was studied. The surface modification of KTa(Zr)O-3 powder with acene dyes was conducted with an evaporation-to-dryness method using pyridine as a solvent. TIPSPEN is the most effective dye for increasing the hydrogen formation rate on the KTa(Zr)O-3 catalyst, which became larger by 14 times. The fluorescence spectrum of the TIPS-PEN-modified catalyst revealed that the excitation energy of KTa(Zr)O(3 )was transferred to the Pt cocatalyst through the TIPS-PEN moiety. The wavelength dependence of the photocatalytic activity was investigated, and the water splitting activity was improved by irradiating with both ultraviolet and visible light comparing with the case of irradiating with only ultraviolet light. Furthermore, the water splitting reaction did not occur under visible light irradiation, which suggests that a Z-scheme-type water splitting reaction, that is, a two-step photoexcitation mechanism similar to that occuring in plant photosynthesis, proceeded on PtOx/TIPS-PEN/KTa(Zr)O-3.

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  • Enhanced performance of a Li-ion rechargeable battery at low temperatures: Use of 3,3,3-trifluoropropyl acetate as an electrolyte additive

    Nagano, H; Kim, H; Ikeda, S; Miyoshi, S; Watanabe, M; Ishihara, T

    ELECTROCHEMICAL SCIENCE ADVANCES   2 ( 3 )   2022年6月   ISSN:2698-5977

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    出版者・発行元:Electrochemical Science Advances  

    The addition of 3,3,3-trifluoropropyl acetate (TFPA) to electrolyte in a Li-ion rechargeable battery (LIB) provides a means for increasing the discharge performance at low temperatures as a result of the formation of a superior solid electrolyte interphase (SEI) on the graphite anode. For instance, the addition of 2 wt% TFPA to the electrolyte significantly increased the cycle stability and the discharge capacities at low temperatures (-10°C) even at current rates of 3 C. The SEI films formed on the graphite anodes were characterized by electrochemical and spectroscopic techniques and by computational analysis. Although the formation of LiF on the anode has been recognized, present research revealed that the decomposition of TFPA on the anode surface resulted in the formation of an SEI layer consisting predominantly of organic fluorides. This layer suppressed the decomposition of the electrolyte resulting in a decreased anode impedance and an increase in cycle stability and discharge capacity at low temperatures.

    DOI: 10.1002/elsa.202100062

    Web of Science

    Scopus

  • Mixing nitrogen-containing compounds for synthesis of porous boron nitride for improved porosity, surface functionality, and solid base catalytic activity

    Takagaki, A; Nakamura, S; Ashimura, S; Yoshida, M; Song, JT; Watanabe, M; Hayashi, S; Ishihara, T

    APPLIED CATALYSIS A-GENERAL   638   2022年5月   ISSN:0926-860X eISSN:1873-3875

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Applied Catalysis A: General  

    Porous boron nitride was synthesized using boric acid with urea and/or hexamethylenetetramine (HMTA) via pyrolysis method. X-ray diffraction and Fourier transform infrared measurements indicated that the synthesized boron nitride has a turbostratic structure with both amino and hydroxyl group on the surface. The synthesis using a mixture of two nitrogen-containing precursors was found to not only significantly increase the porosity, but also improve the surface functionality. X-ray photoelectron spectroscopy and B K-edge and O K-edge X-ray absorption fine structure measurements revealed that the proportion of amino and hydroxyl groups on the surface increased with increasing concentration of HMTA during synthesis. Solid-state 11B nuclear magnetic resonance spectroscopy indicated that all samples contained trigonal B-N, trigonal B-O and tetrahedral B-O sites, and that samples prepared with high concentrations of HMTA had less tetrahedral B-O sites, suppressing the formation of BOx species as byproducts. Solid base catalytic activity was evaluated through Knoevenagel condensation, and the catalytic performance was significantly improved by synthesizing boron nitride catalyst using a mixture of the two nitrogen-containing precursors. The enhancement of the activity was influenced by the development of the pore structure as well as the emergence of functional groups on the surface.

    DOI: 10.1016/j.apcata.2022.118635

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  • Defective high-entropy oxide photocatalyst with high activity for CO2 conversion

    Akrami, S; Murakami, Y; Watanabe, M; Ishihara, T; Arita, M; Fuji, M; Edalati, K

    APPLIED CATALYSIS B-ENVIRONMENTAL   303   2022年4月   ISSN:0926-3373 eISSN:1873-3883

  • Ethylene Carbonate (EC)-Propyl Acetate (PA) Based Electrolyte for Low Temperature Performance of Li-Ion Rechargeable Batteries

    Hiroki Nagano, Hackho Kim, Suguru Ikeda, Seiji Miyoshi, Motonori Watanabe, Tatsumi Ishihara

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   94 ( 9 )   2202 - 2209   2021年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/bcsj.20210185

  • Heptacene: Synthesis and Its Hole-Transfer Property in Stable Thin Films

    Takaaki Miyazaki, Motonori Watanabe, Toshinori Matsushima, Ching-Ting Chien, Chihaya Adachi, Shih-Sheng Sun, Hiroyuki Furuta, Tahsin J. Chow

    CHEMISTRY-A EUROPEAN JOURNAL   27 ( 41 )   10677 - 10684   2021年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/chem.202100936

  • High-entropy oxynitride as a low-bandgap and stable photocatalyst for hydrogen production

    Parisa Edalati, Xiao-Feng Shen, Motonori Watanabe, Tatsumi Ishihara, Makoto Arita, Masayoshi Fuji, Kaveh Edalati

    JOURNAL OF MATERIALS CHEMISTRY A   9 ( 26 )   15076 - 15086   2021年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/d1ta03861c

  • A novel aqueous dual-ion battery using concentrated bisalt electrolyte

    Huan Li, Takuya Kurihara, Dengyao Yang, Motonori Watanabe, Tatsumi Ishihara

    ENERGY STORAGE MATERIALS   38   454 - 461   2021年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.ensm.2021.03.029

  • An effect of crystallographic distortion on carrier mobility in poly(3-hexylthiophene) thin films

    Tatsuki Abe, Daisuke Kawaguchi, Motonori Watanabe, Taiki Hoshino, Tatsumi Ishihara, Keiji Tanaka

    APPLIED PHYSICS LETTERS   118 ( 18 )   2021年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/5.0041881

  • [2.2]Paracyclophane-based hole-transporting materials for perovskite solar cells

    Yin-Sheng Lin, Hsin Li, Wen-Sheng Yu, Szu-Tan Wang, Yi-Min Chang, Tsung-Hsin Liu, Shao-Sian Li, Motonori Watanabe, Hsiao-Han Chiu, Di-Yan Wang, Yuan Jay Chang

    JOURNAL OF POWER SOURCES   491   2021年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jpowsour.2021.229543

  • Hexafluorophosphate-Bis(trifluoromethanesulfonyl)imide anion co-intercalation for increased performance of dual-carbon battery using mixed salt electrolyte

    Jose C. Madrid Madrid, Kotaro Nakamura, Keisuke Inda, Lukas Haneke, Andreas Heckmann, Joop Enno Frerichs, Michael Ryan Hansen, Tobias Placke, Martin Winter, Motonori Watanabe, Atsushi Takagaki, Taner Akbay, Tatsumi Ishihara

    JOURNAL OF POWER SOURCES   479   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jpowsour.2020.229084

  • Tensile strain for band engineering of SrTiO3 for increasing photocatalytic activity to water splitting

    Yoonyoung Kim, Motonori Watanabe, Junko Matsuda, Jun Tae Song, Atsushi Takagaki, Aleksandar Staykov, Tatsumi Ishihara

    APPLIED CATALYSIS B-ENVIRONMENTAL   278   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.apcatb.2020.119292

  • Porous Boron Nitride as a Weak Solid Base Catalyst

    Shohei Nakamura, Atsushi Takagaki, Motonori Watanabe, Kanta Yamada, Masaaki Yoshida, Tatsumi Ishihara

    CHEMCATCHEM   12 ( 23 )   6033 - 6039   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/cctc.202001435

  • Photo-biohydrogen Production by Photosensitization with Biologically Precipitated Cadmium Sulfide in Hydrogen-Forming RecombinantEscherichia coli

    Yuki Honda, Yuka Shinohara, Motonori Watanabe, Tatsumi Ishihara, Hiroshi Fujii

    CHEMBIOCHEM   21 ( 23 )   3389 - 3397   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/cbic.202000383

  • Enhancement of solid base activity for porous boron nitride catalysts by controlling active structure using post treatment

    Atsushi Takagaki, Shohei Nakamura, Motonori Watanabe, Yoonyoung Kim, Jun Tae Song, Keiko Jimura, Kanta Yamada, Masaaki Yoshida, Shigenobu Hayashi, Tatsumi Ishihara

    APPLIED CATALYSIS A-GENERAL   608   2020年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.apcata.2020.117843

  • Novel black bismuth oxide (Bi2O3) with enhanced photocurrent generation, produced by high-pressure torsion straining 招待 査読 国際誌

    Ikuro Fujita, Parisa Edalati, Qing Wang, Motonori Watanabe, Makoto Arita, Shinji Munetoh, Tatsumi Ishihara, Kaveh Edalati

    Scripta Materialia   187   366 - 370   2020年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.scriptamat.2020.06.052

  • Novel black bismuth oxide (Bi2O3) with enhanced photocurrent generation, produced by high-pressure torsion straining

    Ikuro Fujita, Parisa Edalati, Qing Wang, Motonori Watanabe, Makoto Arita, Shinji Munetoh, Tatsumi Ishihara, Kaveh Edalati

    SCRIPTA MATERIALIA   187   366 - 370   2020年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.scriptamat.2020.06.052

  • Highly correlation of CO2 reduction selectivity and surface electron Accumulation A case study of Au-MoS2 and Ag-MoS2 catalyst 査読

    Songmei Sun, Qi An, Motonori Watanabe, Junfang Cheng, Hack Ho Kim, Taner Akbay, Atsushi Takagaki, Tatsumi Ishihara

    Applied Catalysis B: Environmental   271   2020年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.apcatb.2020.118931

  • Highly correlation of CO2 reduction selectivity and surface electron Accumulation: A case study of Au-MoS2 and Ag-MoS2 catalyst

    Songmei Sun, Qi An, Motonori Watanabe, Junfang Cheng, Hack Ho Kim, Taner Akbay, Atsushi Takagaki, Tatsumi Ishihara

    APPLIED CATALYSIS B-ENVIRONMENTAL   271   2020年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.apcatb.2020.118931

  • Scandium and copper co-doping effect on stability and activity to the NO direct decomposition of Ba3Y4O9

    Siman Fang, Atsushi Takagaki, Motonori Watanabe, Jun Tae Song, Tatsumi Ishihara

    APPLIED CATALYSIS A-GENERAL   602   2020年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.apcata.2020.117743

  • Z-scheme-type conductive-polymer-P3HT/KTa(Zr)O-3 heterojunction composites for enhancing the photocatalytic activity of water splitting

    Yuta Koganemaru, Yoonyoung Kim, Motonori Watanabe, Atsushi Takagaki, Tatsumi Ishihara

    APPLIED CATALYSIS A-GENERAL   602   2020年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.apcata.2020.117737

  • High-pressure torsion to induce oxygen vacancies in nanocrystals of magnesium oxide Enhanced light absorbance, photocatalysis and significance in geology 査読

    Ikuro Fujita, Kaveh Edalati, Qing Wang, Makoto Arita, Motonori Watanabe, Shinji Munetoh, Tatsumi Ishihara, Zenji Horita

    Materialia   11   2020年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.mtla.2020.100670

  • Visible-Light Photocurrent in Nanostructured High-Pressure TiO2-II (Columbite) Phase

    Qing Wang, Motonori Watanabe, Kaveh Edalati

    JOURNAL OF PHYSICAL CHEMISTRY C   124 ( 25 )   13930 - 13935   2020年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.jpcc.0c03923

  • Photobiocatalytic H(2)evolution of GaN:ZnO and [FeFe]-hydrogenase recombinantEscherichia coli

    Nuttavut Kosem, Yuki Honda, Motonori Watanabe, Atsushi Takagaki, Zahra Pourmand Tehrani, Fatima Haydous, Thomas Lippert, Tatsumi Ishihara

    CATALYSIS SCIENCE & TECHNOLOGY   10 ( 12 )   4042 - 4052   2020年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/d0cy00128g

  • High-pressure torsion to induce oxygen vacancies in nanocrystals of magnesium oxide: Enhanced light absorbance, photocatalysis and significance in geology

    Ikuro Fujita, Kaveh Edalati, Qing Wang, Makoto Arita, Motonori Watanabe, Shinji Munetoh, Tatsumi Ishihara, Zenji Horita

    MATERIALIA   11   2020年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.mtla.2020.100670

  • Pyridyl-anchored type bodipy sensitizer-tio2 photocatalyst for enhanced visible light-driven photocatalytic hydrogen production 査読

    Xiao Feng Shen, Motonori Watanabe, Atsushi Takagaki, Jun Tae Song, Tatsumi Ishihara

    Catalysts   10 ( 5 )   2020年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/catal10050535

  • Pyridyl-Anchored Type BODIPY Sensitizer-TiO2 Photocatalyst for Enhanced Visible Light-Driven Photocatalytic Hydrogen Production

    Xiao-Feng Shen, Motonori Watanabe, Atsushi Takagaki, Jun Tae Song, Tatsumi Ishihara

    CATALYSTS   10 ( 5 )   2020年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/catal10050535

  • Characteristics of crystalline sputtered LaFeO3 thin films as photoelectrochemical water splitting photocathodes

    Min-Kyu Son, Hyunwoong Seo, Motonori Watanabe, Masaharu Shiratani, Tatsumi Ishihara

    NANOSCALE   12 ( 17 )   9653 - 9660   2020年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/d0nr01762k

  • The direct decomposition of NO into N2 and O2 over copper doped Ba3Y4O9 査読

    Siman Fang, Atsushi Takagaki, Motonori Watanabe, Tatsumi Ishihara

    Catalysis Science and Technology   10 ( 8 )   2513 - 2522   2020年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/d0cy00194e

  • The direct decomposition of NO into N-2 and O-2 over copper doped Ba3Y4O9

    Siman Fang, Atsushi Takagaki, Motonori Watanabe, Tatsumi Ishihara

    CATALYSIS SCIENCE & TECHNOLOGY   10 ( 8 )   2513 - 2522   2020年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/d0cy00194e

  • Enhanced photocatalytic hydrogen production on GaN–ZnO oxynitride by introduction of strain-induced nitrogen vacancy complexes 査読

    185   149 - 156   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Oxynitrides are considered as new potential candidates for photocatalysis due to their lower bandgap compared with traditional oxide photocatalysts. However, the formation of native nitrogen monovacancies during the synthesis of oxynitrides reduces their photocatalytic activity due to the vacancy-induced electron/hole recombination. This study shows that a transition from the native nitrogen monovacancies to the nitrogen-based vacancy complexes in a GaN–ZnO oxynitride not only diminishes the recombination but also enhances the photocatalytic hydrogen production. Here, the vacancy complexes are introduced by mechanical straining via the high-pressure torsion (HPT) method and it is shown that the vacancy complexes reduce the bandgap and increase the over-potential for hydrogen production on the conduction band. The current results introduce a simple but effective approach to turn the nitrogen vacancies to favorable defects for photocatalysis.

    DOI: 10.1016/j.actamat.2019.12.007

  • Photocatalytic hydrogen generation on low-bandgap black zirconia (ZrO2) produced by high-pressure torsion

    Qing Wang, Kaveh Edalati, Yuta Koganemaru, Shohei Nakamura, Motonori Watanabe, Tatsumi Ishihara, Zenji Horita

    JOURNAL OF MATERIALS CHEMISTRY A   8 ( 7 )   3643 - 3650   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c9ta11839j

  • Improved Photocatalytic Hydrogen Evolution on Tantalate Perovskites CsTaO3 and LiTaO3 by Strain-Induced Vacancies

    Kaveh Edalati, Keisuke Fujiwara, Shuhei Takechi, Qing Wang, Makoto Arita, Motonori Watanabe, Xavier Sauvage, Tatsumi Ishihara, Zenji Horita

    ACS APPLIED ENERGY MATERIALS   3 ( 2 )   1710 - 1718   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsaem.9b02197

  • Enhanced photocatalytic hydrogen production on GaN-ZnO oxynitride by introduction of strain-induced nitrogen vacancy complexes

    Kaveh Edalati, Ryoko Uehiro, Shuhei Takechi, Qing Wang, Makoto Arita, Motonori Watanabe, Tatsumi Ishihara, Zenji Horita

    ACTA MATERIALIA   185   149 - 156   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.actamat.2019.12.007

  • Photocatalytic hydrogen generation on low-bandgap black zirconia (ZrO2) produced by high-pressure torsion 査読

    Qing Wang, Kaveh Edalati, Yuta Koganemaru, Shohei Nakamura, Motonori Watanabe, Tatsumi Ishihara, Zenji Horita

    Journal of Materials Chemistry A   8 ( 7 )   3643 - 3650   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c9ta11839j

  • Improved Photocatalytic Hydrogen Evolution on Tantalate Perovskites CsTaO3 and LiTaO3 by Strain-Induced Vacancies 査読

    Kaveh Edalati, Keisuke Fujiwara, Shuhei Takechi, Qing Wang, Makoto Arita, Motonori Watanabe, Xavier Sauvage, Tatsumi Ishihara, Zenji Horita

    ACS Applied Energy Materials   3 ( 2 )   1710 - 1718   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsaem.9b02197

  • Chemo-mechanical strain effects on band engineering of the TiO2 photocatalyst for increasing the water splitting activity 査読

    Yoonyoung Kim, Motonori Watanabe, Junko Matsuda, Aleksandar Staykov, Hajime Kusaba, Atsushi Takagaki, Taner Akbay, Tatsumi Ishihara

    Journal of Materials Chemistry A   8 ( 3 )   1335 - 1346   2020年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c9ta11048h

  • Chemo-mechanical strain effects on band engineering of the TiO2 photocatalyst for increasing the water splitting activity

    Yoonyoung Kim, Motonori Watanabe, Junko Matsuda, Aleksandar Staykov, Hajime Kusaba, Atsushi Takagaki, Taner Akbay, Tatsumi Ishihara

    JOURNAL OF MATERIALS CHEMISTRY A   8 ( 3 )   1335 - 1346   2020年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c9ta11048h

  • Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining 査読

    K. Edalati, I. Fujita, Shuhei Takechi, Yuki Nakashima, Kazuki Kumano, Hadi Razavi-Khosroshahi, Makoto Arita, Motonori Watanabe, Xavier Sauvage, T. Akbay, Tatsumi Ishihara, Masayoshi Fuji, Z. Horita

    Scripta Materialia   173   120 - 124   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.scriptamat.2019.08.011

  • Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO3 for Increasing Photocatalytic Water Splitting Activity

    Yoonyoung Kim, Motonori Watanabe, Atsushi Takagaki, Junko Matsuda, Tatsumi Ishihara

    CHEMCATCHEM   11 ( 24 )   6270 - 6274   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/cctc.201901549

  • Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining

    Kaveh Edalati, Ikuro Fujita, Shuhei Takechi, Yuki Nakashima, Kazuki Kumano, Hadi Razavi-Khosroshahi, Makoto Arita, Motonori Watanabe, Xavier Sauvage, Taner Akbay, Tatsumi Ishihara, Masayoshi Fuji, Zenji Horita

    SCRIPTA MATERIALIA   173   120 - 124   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.scriptamat.2019.08.011

  • Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO3 for Increasing Photocatalytic Water Splitting Activity 査読

    Yoonyoung Kim, Motonori Watanabe, Atsushi Takagaki, Junko Matsuda, Tatsumi Ishihara

    ChemCatChem   11 ( 24 )   6270 - 6274   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/cctc.201901549

  • Electrocatalytic hydrogen production using [FeFe]-hydrogenase mimics based on tetracene derivatives

    Motonori Watanabe, Kenta Goto, Takaaki Miyazaki, Masahiko Shibahara, Yuan Jay Chang, Tahsin J. Chow, Tatsumi Ishihara

    NEW JOURNAL OF CHEMISTRY   43 ( 35 )   13810 - 13815   2019年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c9nj02790d

  • Single-Electron-Trapped Oxygen Vacancy on Ultrathin WO3·0.33H2O {100} Facets Suppressing Backward Reaction for Promoted H2 Evolution in Pure Water Splitting 査読

    10 ( 11 )   2998 - 3005   2019年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Solar water splitting to produce hydrogen is a promising solution for global energy issues. One of the main bottlenecks in this technology is the spontaneous fast backward reaction (2H2 + O2 → H2O, ΔG < 0), limiting the solar energy conversion efficiency. How to suppress backward reaction is vitally important but rarely reported. Here we found that single-electron-trapped oxygen vacancy (Vo·) can suppress spontaneous backward reaction in pure water splitting. Taking WO3·0.33H2O catalyst as an example, ultrathin WO3·0.33H2O {100} facets with large amount of surface Vo· realized a continuous H2 evolution from pure water splitting with a productivity of 9.9 μmol/g·h without the assistance of any sacrifice agent and noble metal cocatalyst. Quantum chemical calculations revealed that the backward-reaction suppression ability of Vo· is attributed to the high concentration of localized electrons around Vo·, stimulating unidirectional simultaneous water dissociation into H and OH under light irradiation.

    DOI: 10.1021/acs.jpclett.9b01032

  • Single-Electron-Trapped Oxygen Vacancy on Ultrathin WO3 center dot 0.33H(2)O {100} Facets Suppressing Backward Reaction for Promoted H-2 Evolution in Pure Water Splitting

    Songmei Sun, Ji Wu, Motonori Watanabe, Taner Akbay, Tatsumi Ishihara

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   10 ( 11 )   2998 - 3005   2019年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.jpclett.9b01032

  • Synergistic Enhancement of H 2 and CH 4 Evolution by CO 2 Photoreduction in Water with Reduced Graphene Oxide-Bismuth Monoxide Quantum Dot Catalyst 査読

    Songmei Sun, Motonori Watanabe, Pangpang Wang, Tatsumi Ishihara

    ACS Applied Energy Materials   2 ( 3 )   2104 - 2112   2019年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsaem.8b02153

  • Synergistic Enhancement of H-2 and CH4 Evolution by CO2 Photoreduction in Water with Reduced Graphene Oxide-Bismuth Monoxide Quantum Dot Catalyst

    Songmei Sun, Motonori Watanabe, Pangpang Wang, Tatsumi Ishihara

    ACS APPLIED ENERGY MATERIALS   2 ( 3 )   2104 - 2112   2019年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsaem.8b02153

  • Synthesis of perfluoroalkyl gelators and their selective gelation ability for fluorinated solvents 1 査読

    Toshiaki Shimasaki, Yuki Ohno, Mao Tanaka, Masato Amano, Yuta Sasaki, Hirobumi Shibata, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    Bulletin of the Chemical Society of Japan   97 - 104   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/bcsj.20180261

  • Synthesis of Perfluoroalkyl Gelators and Their Selective Gelation Ability for Fluorinated Solvents

    Toshiaki Shimasaki, Yuki Ohno, Mao Tanaka, Masato Amano, Yuta Sasaki, Hirobumi Shibata, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   92 ( 1 )   97 - 104   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/bcsj.20180261

  • Electrocatalytic hydrogen production using[FeFe]-hydrogenase mimics based on tetracene derivatives 査読

    Motonori Watanabe, Kenta Goto, Takaaki Miyazaki, Masahiko Shibahara, Yuan Jay Chang, Tahsin J. Chow, Tatsumi Ishihara

    New Journal of Chemistry   43 ( 35 )   13810 - 13815   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c9nj02790d

  • Ultra-low friction of polyethylenimine / molybdenum disulfide (PEI/MoS2)15 thin films in dry nitrogen atmosphere and the effect of heat treatment 査読

    Prabakaran Saravanan, Roman Selyanchyn, Motonori Watanabe, Shigenori Fujikawa, Hiroyoshi Tanaka, Stephen Matthew Lyth, Joichi Sugimura

    Tribology International   127   255 - 263   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.triboint.2018.06.003

  • Visible Light-Driven Dye-Sensitized Photocatalytic Hydrogen Production by Porphyrin and its Cyclic Dimer and Trimer: Effect of Multi-Pyridyl-Anchoring Groups on Photocatalytic Activity and Stability

    Motonori Watanabe, Songmei Sun, Tatsumi Ishihara, Takuya Kamimura, Masato Nishimura, Fumito Tani

    ACS APPLIED ENERGY MATERIALS   1 ( 11 )   6072 - 6081   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsaem.8b01113

  • Ultra-low friction of polyethylenimine / molybdenum disulfide (PEI/MoS2)(15) thin films in dry nitrogen atmosphere and the effect of heat treatment

    Prabakaran Saravanan, Roman Selyanchyn, Motonori Watanabe, Shigenori Fujikawa, Hiroyoshi Tanaka, Stephen Matthew Lyth, Joichi Sugimura

    TRIBOLOGY INTERNATIONAL   127   255 - 263   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.triboint.2018.06.003

  • Visible Light-Driven Dye-Sensitized Photocatalytic Hydrogen Production by Porphyrin and its Cyclic Dimer and Trimer Effect of Multi-Pyridyl-Anchoring Groups on Photocatalytic Activity and Stability 査読

    Motonori Watanabe, Songmei Sun, Tatsumi Ishihara, Takuya Kamimura, Masato Nishimura, Fumito Tani

    ACS Applied Energy Materials   1 ( 11 )   6072 - 6081   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsaem.8b01113

  • Donor-Donor'-Acceptor Triads Based on [3.3]Paracyclophane with a 1,4-Dithiafulvene Donor and a Cyanomethylene Acceptor: Synthesis, Structure, and Electrochemical and Photophysical Properties

    Katsuya Sako, Tomoya Hasegawa, Hiroyuki Onda, Michito Shiotsuka, Motonori Watanabe, Teruo Shinmyozu, Sachiko Tojo, Mamoru Fujitsuka, Tetsuro Majima, Yasukazu Hirao, Takashi Kubo, Tetsuo Iwanaga, Shinji Toyota, Hiroyuki Takemura

    CHEMISTRY-A EUROPEAN JOURNAL   24 ( 44 )   11407 - 11416   2018年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/chem.201801774

  • A Cocatalyst that Stabilizes a Hydride Intermediate during Photocatalytic Hydrogen Evolution over a Rhodium-Doped TiO 2 Nanosheet 査読

    Shintaro Ida, Kenta Sato, Tetsuya Nagata, Hidehisa Hagiwara, Motonori Watanabe, Namhoon Kim, Yoshihito Shiota, Michio Koinuma, Sakae Takenaka, Takaaki Sakai, Elif Ertekin, Tatsumi Ishihara

    Angewandte Chemie - International Edition   57 ( 29 )   9073 - 9077   2018年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/anie.201803214

  • A Cocatalyst that Stabilizes a Hydride Intermediate during Photocatalytic Hydrogen Evolution over a Rhodium-Doped TiO2 Nanosheet

    Shintaro Ida, Kenta Sato, Tetsuya Nagata, Hidehisa Hagiwara, Motonori Watanabe, Namhoon Kim, Yoshihito Shiota, Michio Koinuma, Sakae Takenaka, Takaaki Sakai, Elif Ertekin, Tatsumi Ishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   57 ( 29 )   9073 - 9077   2018年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/anie.201803214

  • Synthesis and properties of fully conjugated macrocycles composed of m-diethynylene-phenylene-bridged two dibenzofuran, dibenzothiophene and carbazole units 査読

    Toshiaki Shimasaki, Shunsuke Okajima, Rino Ishikawa, Shinji Kawaguchi, Takeshi Akimoto, Naoto Asano, Tetsuo Iwanaga, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    Tetrahedron   74 ( 20 )   2454 - 2465   2018年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tet.2018.03.072

  • Ultrathin WO3 center dot 0.33H(2)O Nanotubes for CO2 Photoreduction to Acetate with High Selectivity

    Songmei Sun, Motonori Watanabe, Ji Wu, Qi An, Tatsumi Ishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   140 ( 20 )   6474 - 6482   2018年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jacs.8b03316

  • Synthesis and properties of fully conjugated macrocycles composed of m-diethynylene-phenylene-bridged two dibenzofuran, dibenzothiophene and carbazole units

    Toshiaki Shimasaki, Shunsuke Okajima, Rino Ishikawa, Shinji Kawaguchi, Takeshi Akimoto, Naoto Asano, Tetsuo Iwanaga, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    TETRAHEDRON   74 ( 20 )   2454 - 2465   2018年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tet.2018.03.072

  • Ultrathin WO3·0.33H2O Nanotubes for CO2 Photoreduction to Acetate with High Selectivity 査読

    140 ( 20 )   6474 - 6482   2018年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Artificial photosynthesis from CO2 reduction is severely hampered by the kinetically challenging multi-electron reaction process. Oxygen vacancies (Vo) with abundant localized electrons have great potential to overcome this limitation. However, surface Vo usually have low concentrations and are easily oxidized, causing them to lose their activities. For practical application of CO2 photoreduction, fabricating and enhancing the stability of Vo on semiconductors is indispensable. Here we report the first synthesis of ultrathin WO3·0.33H2O nanotubes with a large amount of exposed surface Vo sites, which can realize excellent and stable CO2 photoreduction to CH3COOH in pure water under solar light. The selectivity for acetum generation is up to 85%, with an average productivity of about 9.4 μmol g-1 h-1. More importantly, Vo in the catalyst are sustainable, and their concentration was not decreased even after 60 h of reaction. Quantum chemical calculations and in situ DRIFT studies revealed that the main reaction pathway might be CO2COOH → (COOH)2 → CH3COOH.

    DOI: 10.1021/jacs.8b03316

  • Donor-Donor'-Acceptor Triads Based on [3.3]Paracyclophane with a 1,4-Dithiafulvene Donor and a Cyanomethylene Acceptor Synthesis, Structure, and Electrochemical and Photophysical Properties 査読

    Katsuya Sako, Tomoya Hasegawa, Hiroyuki Onda, Michito Shiotsuka, Motonori Watanabe, Teruo Shinmyozu, Sachiko Tojo, Mamoru Fujitsuka, Tetsuro Majima, Yasukazu Hirao, Takashi Kubo, Tetsuo Iwanaga, Shinji Toyota, Hiroyuki Takemura

    Chemistry - A European Journal   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/chem.201801774

  • Synthesis and physical properties of brominated hexacene and hole-transfer properties of thin-film transistors 査読

    Motonori Watanabe, Takaaki Miyazaki, Toshinori Matsusima, Junko Matsuda, Ching Ting Chein, Masahiko Shibahara, Chihaya Adachi, Shih Sheng Sun, Tahsin J. Chow, Tatsumi Ishihara

    RSC Advances   8 ( 24 )   13259 - 13265   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c7ra13632c

  • [FeFe]-Hydrogenase and its organic molecule mimics-Artificial and bioengineering application for hydrogenproduction

    Motonori Watanabe, Yuki Honda, Hidehisa Hagiwara, Tatsumi Ishihara

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS   33   1 - 26   2017年12月

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    記述言語:英語  

    DOI: 10.1016/j.jphotochemrev.2017.09.001

  • Dye-sensitized photocatalyst for effective water splitting catalyst

    Motonori Watanabe

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   18 ( 1 )   705 - 723   2017年10月

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    記述言語:英語  

    DOI: 10.1080/14686996.2017.1375376

  • Effects of preparation condition on the photocatalytic activity of porphyrin-modified GaN:ZnO for water splitting 査読

    Hidehisa Hagiwara, Ryota Kakigi, Shuhei Takechi, Motonori Watanabe, Satoshi Hinokuma, Shintaro Ida, Tatsumi Ishihara

    Surface and Coatings Technology   324   601 - 606   2017年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.surfcoat.2016.10.054

  • Effects of preparation condition on the photocatalytic activity of porphyrin-modified GaN:ZnO for water splitting

    Hidehisa Hagiwara, Ryota Kakigi, Shuhei Takechi, Motonori Watanabe, Satoshi Hinokuma, Shintaro Ida, Tatsumi Ishihara

    SURFACE & COATINGS TECHNOLOGY   324   601 - 606   2017年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.surfcoat.2016.10.054

  • Inorganic/whole-cell biohybrid photocatalyst for highly efficient hydrogen production from water

    Yuki Honda, Motonori Watanabe, Hidehisa Hagiwara, Shintaro Ida, Tatsumi Ishihara

    APPLIED CATALYSIS B-ENVIRONMENTAL   210   400 - 406   2017年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.apcatb.2017.04.015

  • Ethynylene-Bridged Conjugate Carbazole Trimers Synthesis and their Structural, Photophysical, and Electrochemical Properties 査読

    Toshiaki Shimasaki, Ryosuke Iwasawa, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    Asian Journal of Organic Chemistry   6 ( 7 )   841 - 851   2017年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/ajoc.201700088

  • Ethynylene-Bridged Conjugate Carbazole Trimers: Synthesis and their Structural, Photophysical, and Electrochemical Properties

    Toshiaki Shimasaki, Ryosuke Iwasawa, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    ASIAN JOURNAL OF ORGANIC CHEMISTRY   6 ( 7 )   841 - 851   2017年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/ajoc.201700088

  • Photoelectrochemical H-2 evolution using TiO2-coated CaFe2O4 without an external applied bias under visible light irradiation at 470 nm based on device modeling

    Shintaro Ida, Kara Kearney, Takamitsu Futagami, Hidehisa Hagiwara, Takaaki Sakai, Motonori Watanabe, Angus Rockett, Tatsumi Ishihara

    SUSTAINABLE ENERGY & FUELS   1 ( 2 )   280 - 287   2017年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c7se00084g

  • Inorganic/whole-cell biohybrid photocatalyst for highly efficient hydrogen production from water 査読

    Yuki Honda, Motonori Watanabe, Hidehisa Hagiwara, Shintaro Ida, Tatsumi Ishihara

    Applied Catalysis B: Environmental   210   400 - 406   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.apcatb.2017.04.015

  • Triphenylamine derivatives and the lithium-ion capture of [3.3] cyclophane used in organic dye-sensitized solar cells

    Yu-Hsiang Chiu, Masahiko Shibahara, Rui-Yu Huang, Motonori Watanabe, Zhong-Sheng Wang, Yu-Jen Hsiao, Bo-Fong Chang, Ting-Hsuan Chiang, Yuan Jay Chang

    DYES AND PIGMENTS   136   761 - 772   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.dyepig.2016.09.043

  • Synthesis of 1,2-Bis(2-aryl-1H-indol-3-yl)ethynes via 5-exo-Digonal Double Cyclization Reactions of 1,4-Bis(2-isocyanophenyl)buta-1,3-diyne with Aryl Grignard Reagents

    Rino Ishikawa, Ryosuke Iwasawa, Yuichiro Takiyama, Tomokazu Yamauchi, Tetsuo Iwanaga, Makoto Takezaki, Motonori Watanabe, Naozumi Teramoto, Toshiaki Shimasaki, Mitsuhiro Shibata

    JOURNAL OF ORGANIC CHEMISTRY   82 ( 1 )   652 - 663   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.joc.6b02668

  • Overall Water Splitting on Dye-modified Inorganic Semiconductor Photocatalysts

    Hidehisa Hagiwara, Motonori Watanabe, Shintaro Ida, Tatsumi Isumara

    JOURNAL OF THE JAPAN PETROLEUM INSTITUTE   60 ( 1 )   10 - 18   2017年1月

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    記述言語:英語  

    DOI: 10.1627/jpi.60.10

  • Triphenylamine derivatives and the lithium-ion capture of [3.3]cyclophane used in organic dye-sensitized solar cells 査読

    Yu Hsiang Chiu, Masahiko Shibahara, Rui Yu Huang, Motonori Watanabe, Zhong Sheng Wang, Yu Jen Hsiao, Bo Fong Chang, Ting Hsuan Chiang, Yuan Jay Chang

    Dyes and Pigments   136   761 - 772   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.dyepig.2016.09.043

  • Synthesis of 1,2-Bis(2-aryl-1H-indol-3-yl)ethynes via 5-exo-Digonal Double Cyclization Reactions of 1,4-Bis(2-isocyanophenyl)buta-1,3-diyne with Aryl Grignard Reagents 査読

    Rino Ishikawa, Ryosuke Iwasawa, Yuichiro Takiyama, Tomokazu Yamauchi, Tetsuo Iwanaga, Makoto Takezaki, Motonori Watanabe, Naozumi Teramoto, Toshiaki Shimasaki, Mitsuhiro Shibata

    Journal of Organic Chemistry   82 ( 1 )   652 - 663   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.joc.6b02668

  • Photoelectrochemical H 2 evolution using TiO 2 -coated CaFe 2 O 4 without an external applied bias under visible light irradiation at 470 nm based on device modeling 査読

    Shintaro Ida, Kara Kearney, Takamitsu Futagami, Hidehisa Hagiwara, Takaaki Sakai, Motonori Watanabe, Angus Rockett, Tatsumi Ishihara

    Sustainable Energy and Fuels   1 ( 2 )   280 - 287   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c7se00084g

  • 5,5 '-alkylsubsituted indigo for solution-processed optoelectronic devices

    Motonori Watanabe, Naoki Uemura, Shintaro Ida, Hidehisa Hagiwara, Kenta Goto, Tatsumi Ishihara

    TETRAHEDRON   72 ( 29 )   4280 - 4287   2016年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tet.2016.05.069

  • Synthesis of Dibromo[3.3]paracyclophanes

    Masahiko Shibahara, Motonori Watanabe, Takaaki Miyazaki, Kenta Goto, Teruo Shinmyozu

    SYNTHESIS-STUTTGART   48 ( 8 )   1197 - 1201   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1055/s-0035-1560421

  • Effect of porphyrin molecular structure on water splitting activity of a KTaO3 photocatalyst 査読

    Hidehisa Hagiwara, Kohei Higashi, Motonori Watanabe, Ryota Kakigi, Shintaro Ida, Tatsumi Ishihara

    Catalysts   6 ( 3 )   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/catal6030042

  • Effect of Porphyrin Molecular Structure on Water Splitting Activity of a KTaO3 Photocatalyst

    Hidehisa Hagiwara, Kohei Higashi, Motonori Watanabe, Ryota Kakigi, Shintaro Ida, Tatsumi Ishihara

    CATALYSTS   6 ( 3 )   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/catal6030042

  • Synthesis of Dibromo[33]paracyclophanes 査読

    Masahiko Shibahara, Motonori Watanabe, Takaaki Miyazaki, Kenta Goto, Taisuke Matsumoto, Teruo Shinmyozu

    Synthesis (Germany)   48 ( 8 )   1197 - 1201   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1055/s-0035-1560421

  • 5,5′-alkylsubsituted indigo for solution-processed optoelectronic devices 査読

    72 ( 29 )   4280 - 4287   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A series of alkylated indigos were synthesized. Alkylated indigos were characterized by NMR, mass spectrometry, absorption spectra, cyclic voltammetry, and density functional theory (DFT) calculations. Propyl and butyl group substituted indigo was most soluble in chloroform and 1,2-dicrolobenzene, and these solubility were 65–89 times increased as compared to the parent indigo. DFT calculations suggested that the presence of the alkyl chains at the 5.5′-position increases the energy of the highest occupied molecular orbital, while reducing the energy of the lowest unoccupied molecular orbital. This theoretical finding was in good agreement with the experimental results. Crystal structures obtained by X-ray diffraction showed one-dimensional pi–pi stacking. Alkylated molecules were converted to leuco structure, and these structures were then converted to the corresponding indigos in the film state. After deposition of the films on TiO2/FTO substrate, oxidative photocurrents were observed.

    DOI: 10.1016/j.tet.2016.05.069

  • Dual-carbon battery using high concentration LiPF6 in dimethyl carbonate (DMC) electrolyte 査読

    Seiji Miyoshi, Hiroki Nagano, Taro Fukuda, Takuya Kurihara, Motonori Watanabe, Shintaro Ida, Tatsumi Ishihara

    Journal of the Electrochemical Society   163 ( 7 )   A1206 - A1213   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1149/2.0381607jes

  • Synthesis of bromo- and iodo-substituted pyromellitic diimide-based [2+2]- and [3+3]macrocycles, and their absorption spectra and electrochemical and inclusion properties 査読

    Md Ershad Halim, Arkasish Bandyopadhyay, Liansheng Sun, Keisuke Tao, Yogesh Shashikant Sangvikar, Takaaki Miyazaki, Motonori Watanabe, Keiko Ideta, Taisuke Matsumoto, Kenta Goto, Teruo Shinmyozu

    Tetrahedron Letters   56 ( 50 )   6970 - 6974   2015年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2015.10.070

  • Synthesis of bromo- and iodo-substituted pyromellitic diimide-based [2+2]- and [3+3]macrocycles, and their absorption spectra and electrochemical and inclusion properties

    Md. Ershad Halim, Arkasish Bandyopadhyay, Liansheng Sun, Keisuke Tao, Yogesh Shashikant Sangvikar, Takaaki Miyazaki, Motonori Watanabe, Keiko Ideta, Taisuke Matsumoto, Kenta Goto, Teruo Shinmyozu

    TETRAHEDRON LETTERS   56 ( 50 )   6970 - 6974   2015年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2015.10.070

  • Synthesis and Investigation of the Effect of Substitution on the Structure, Physical Properties, and Electrochemical Properties of Anthracenodifuran Derivatives 査読

    Motonori Watanabe, Yasutaka Doi, Hidehisa Hagiwara, Aleksandar Tsekov Staykov, Shintaro Ida, Taisuke Matsumoto, Teruo Shinmyozu, Tatsumi Ishihara

    Journal of Organic Chemistry   80 ( 18 )   9159 - 9166   2015年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.joc.5b01525

  • Synthesis and Investigation of the Effect of Substitution on the Structure, Physical Properties, and Electrochemical Properties of Anthracenodifuran Derivatives

    Motonori Watanabe, Yasutaka Doi, Hidehisa Hagiwara, Aleksandar Tsekov Stakov, Shintaro Ida, Taisuke Matsumoto, Teruo Shinmyozu, Tatsumi Ishihara

    JOURNAL OF ORGANIC CHEMISTRY   80 ( 18 )   9159 - 9166   2015年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.joc.5b01525

  • Synthesis and electronic properties of ferrocene-containing organic dyads 査読

    Motonori Watanabe, Yuan Jay Chang, Po Ting Chou, Aleksandar Tsekov Staykov, Masahiko Shibahara, Katsuya Sako, Tatsumi Ishihara, Tahsin J. Chow

    Tetrahedron Letters   56 ( 12 )   1548 - 1551   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2015.02.012

  • The synthesis of 2-halopentacenes and their charge transport properties

    Ching-Ting Chien, Motonori Watanabe, Tahsin J. Chow

    TETRAHEDRON   71 ( 11 )   1668 - 1673   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tet.2015.01.056

  • Synthesis and electronic properties of ferrocene-containing organic dyads

    Motonori Watanabe, Yuan Jay Chang, Po-Ting Chou, Aleksandar Staykov, Masahiko Shibahara, Katsuya Sako, Tatsumi Ishihara, Tahsin J. Chow

    TETRAHEDRON LETTERS   56 ( 12 )   1548 - 1551   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2015.02.012

  • The synthesis of 2-halopentacenes and their charge transport properties 査読

    Ching Ting Chien, Motonori Watanabe, Tahsin J. Chow

    Tetrahedron   71 ( 11 )   1668 - 1673   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tet.2015.01.056

  • Cycloaddition of hexacene and fullerene[60] 査読

    Wei Ting Su, Motonori Watanabe, Yuan Jay Chang, Po Ting Chou, Avijit Ghosh, Tahsin J. Chow

    Tetrahedron Letters   56 ( 9 )   1092 - 1095   2015年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2015.01.093

  • Cycloaddition of hexacene and fullerene[60]

    Wei-Ting Su, Motonori Watanabe, Yuan Jay Chang, Po-Ting Chou, Avijit Ghosh, Tahsin J. Chow

    TETRAHEDRON LETTERS   56 ( 9 )   1092 - 1095   2015年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2015.01.093

  • Impact of alkoxy chain length on carbazole-based, visible light-driven, dye sensitized photocatalytic hydrogen production 査読

    Motonori Watanabe, Hidehisa Hagiwara, Yudai Ogata, Aleksandar Tsekov Staykov, Sean R. Bishop, Nicola Helen Perry, Yuan Jay Chang, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    Journal of Materials Chemistry A   3 ( 43 )   21713 - 21721   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c5ta04991a

  • Structural properties of five- and six-layered [3.3]metacyclophanes 査読

    Masahiko Shibahara, Motonori Watanabe, Kenta Goto, Takaaki Miyazaki, Hua Zhang, Yuki Nakayama, Teruo Shinmyozu

    Tetrahedron Letters   55 ( 51 )   7089 - 7093   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2014.10.151

  • Synthesis and Electronic and Photophysical Properties of [2.2]- and [3.3]Paracyclophane-Based Donor-Donor'-Acceptor Triads

    Takaaki Miyazaki, Masahiko Shibahara, Jun-ichi Fujishige, Motonori Watanabe, Kenta Goto, Teruo Shinmyozu

    JOURNAL OF ORGANIC CHEMISTRY   79 ( 23 )   11440 - 11453   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jo5020273

  • Structural properties of five- and six-layered [3.3]metacyclophanes

    Masahiko Shibahara, Motonori Watanabe, Kenta Goto, Takaaki Miyazaki, Hua Zhang, Yuki Nakayama, Teruo Shinmyozu

    TETRAHEDRON LETTERS   55 ( 51 )   7089 - 7093   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2014.10.151

  • Synthesis and electronic and photophysical properties of [2.2]- and [3.3]paracyclophane-based donor-donor′-acceptor triads 査読

    79 ( 23 )   11440 - 11453   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Three types of the donor(D)-donor′(D′)-acceptor(A) triads 1-6 with different D-A combinations, carbazole (Cz, D)-[n.n]PCP(D′)-1,8-naphthalimide (NI, A) (1-3), 10H-phenothiazine (PTZ, D)-[n.n]PCP(D′)-NI(A) (4, 5), and 10-methyl-10H-phenothiazine (Me-PTZ, D)-[2.2]PCP-2,1,3-benzothiadiazole (BTD, A) 6, were synthesized for the elucidation of their photophysical properties. The absorption spectra and electrochemical properties indicated that the chromophores (D, D′, and A) do not interact with each other in the ground state. Cz-(CH2)3-[2.2]PCP-(CH2)3-NI 1 and Cz-(CH2)3-[3.3]PCP-(CH2)3-NI 2 show an exciplex emission between the PCP and NI moieties in cyclohexane and the intensity of the band is much higher in 2 than in 1, whereas Cz-(CH2)2-[2.2]PCP-(CH2)2-NI 3 does not show any exciplex emission in cyclohexane. These results indicated that the combination of [3.3]PCP and a trimethylene chain is preferable for the exciplex formation. PTZ-(CH2)3-[2.2]PCP-(CH2)3-NI 4 shows a broad band at 519 nm in cyclohexane, which is associated with the formation of the exterplex band among the NI, [2.2]PCP, and PTZ moieties, while PTZ-(CH2)3-[3.3]PCP-(CH2)3-NI 5 does not show the band. Me-PTZ-(CH2)2-[2.2]PCP-(CH2)2-BTD 6 shows a broad fluorescence band due to both the BTD and PTZ moieties in cyclohexane. In CH3CN, the fluorescence spectra of 1-6 suggest the presence of a photoinduced charge separation process. The study of the photoinduced charge separation process will be soon reported elsewhere.

    DOI: 10.1021/jo5020273

  • Crystal structure of a four-layered [3.3](3,5)pyridinophane

    Masahiko Shibahara, Motonori Watanabe, Taisuke Matsumoto, Kenta Goto, Teruo Shinmyozu

    ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE   70   447 - +   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1107/S1600536814023691

  • Photoswitching of Conductance through Salicylidene Methylamine

    Aleksandar Staykov, Motonori Watanabe, Tatsumi Ishihara, Kazunari Yoshizawa

    JOURNAL OF PHYSICAL CHEMISTRY C   118 ( 47 )   27539 - 27548   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp5081884

  • Modification effects of meso-hexakis(pentafluorophenyl) [26]hexaphyrin aggregates on the photocatalytic water splitting 査読

    Hidehisa Hagiwara, Motonori Watanabe, Takeshi Daio, Shintaro Ida, Tatsumi Ishihara

    Chemical Communications   50 ( 83 )   12515 - 12518   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c4cc05127k

  • N-confused phlorin: a stable dihydroporphyrin isomer containing a confused pyrrole ring

    Masatoshi Ishida, Kensuke Nakahara, Ryuichi Sakashita, Tomoya Ishizuka, Motonori Watanabe, Hidemitsu Uno, Atsuhiro Osuka, Hiroyuki Furuta

    JOURNAL OF PORPHYRINS AND PHTHALOCYANINES   18 ( 10-11 )   909 - 918   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1142/S1088424614500692

  • Benzo[1,2-b:4,5-b ']dithiophene and benzo[1,2-b:4,5-b ']difuran based organic dipolar compounds for sensitized solar cells

    Yan-Zuo Lin, Chia-Wei Yeh, Po-Ting Chou, Motonori Watanabe, Yu-Hsuan Chang, Yuan Jay Chang, Tahsin J. Chow

    DYES AND PIGMENTS   109   81 - 89   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.dyepig.2014.04.043

  • Crystal structure of (E)-2-cyano-3-(12-methyl-12H-benzo[b]phenothiazin-11-yl)acrylic acid

    Motonori Watanabe, Tatsumi Ishihara

    ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS   70   O1026 - +   2014年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1107/S1600536814018388

  • Spacer effects in metal-free organic dyes for visible-light-driven dye-sensitized photocatalytic hydrogen production 査読

    Motonori Watanabe, Hidehisa Hagiwara, Aoi Iribe, Yudai Ogata, Kenta Shiomi, Aleksandar Tsekov Staykov, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    Journal of Materials Chemistry A   2 ( 32 )   12952 - 12961   2014年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c4ta02720e

  • Spacer effects in metal-free organic dyes for visible-light-driven dye-sensitized photocatalytic hydrogen production

    Motonori Watanabe, Hidehisa Hagiwara, Aoi Iribe, Yudai Ogata, Kenta Shiomi, Aleksandar Staykov, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    JOURNAL OF MATERIALS CHEMISTRY A   2 ( 32 )   12952 - 12961   2014年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c4ta02720e

  • N -confused phlorin A stable dihydroporphyrin isomer containing a confused pyrrole ring 査読

    Masatoshi Ishida, Kensuke Nakahara, Ryuichi Sakashita, Tomoya Ishizuka, Motonori Watanabe, Hidemitsu Uno, Atsuhiro Osuka, Hiroyuki Furuta

    Journal of Porphyrins and Phthalocyanines   18 ( 10-11 )   909 - 918   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1142/S1088424614500692

  • Triarylene linked spacer effect for dye-sensitized solar cells

    Yuan Jay Chang, Yu-Jane Wu, Po-Ting Chou, Motonori Watanabe, Tahsin J. Chow

    THIN SOLID FILMS   558   330 - 336   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tsf.2014.03.010

  • Four-layered [3.3] metacyclophane with ethenetetracarbonitrile

    Masahiko Shibahara, Motonori Watanabe, Kenta Goto, Teruo Shinmyozu

    ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS   70   O625 - +   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1107/S1600536814009362

  • Triarylene linked spacer effect for dye-sensitized solar cells 査読

    Yuan Jay Chang, Yu Jane Wu, Po Ting Chou, Motonori Watanabe, Tahsin J. Chow

    Thin Solid Films   558   330 - 336   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tsf.2014.03.010

  • Synthesis, physical properties, and structure of TIPS-difuranoacenes 査読

    Motonori Watanabe, Ching Ting Chien, Yan Duo Lin, Yuan Jay Chang, Yuh Sheng Wen, Kenta Goto, Masahiko Shibahara, Teruo Shinmyozu, Tahsin J. Chow

    Tetrahedron Letters   55 ( 8 )   1424 - 1427   2014年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2014.01.036

  • Synthesis, physical properties, and structure of TIPS-difuranoacenes

    Motonori Watanabe, Ching-Ting Chien, Yan-Duo Lin, Yuan Jay Chang, Yuh-Sheng Wen, Kenta Goto, Masahiko Shibahara, Teruo Shinmyozu, Tahsin J. Chow

    TETRAHEDRON LETTERS   55 ( 8 )   1424 - 1427   2014年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2014.01.036

  • Anthracene based organic dipolar compounds for sensitized solar cells 査読

    Yan Zuo Lin, Chiung Hui Huang, Yuan Jay Chang, Chia Wei Yeh, Tsung Mei Chin, Kai Ming Chi, Po Ting Chou, Motonori Watanabe, Tahsin J. Chow

    Tetrahedron   70 ( 2 )   262 - 269   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tet.2013.11.072

  • Anthracene based organic dipolar compounds for sensitized solar cells

    Yan-Zuo Lin, Chiung Hui Huang, Yuan Jay Chang, Chia-Wei Yeh, Tsung-Mei Chin, Kai-Ming Chi, Po-Ting Chou, Motonori Watanabe, Tahsin J. Chow

    TETRAHEDRON   70 ( 2 )   262 - 269   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tet.2013.11.072

  • Photoswitching of conductance through salicylidene methylamine 査読

    Aleksandar Tsekov Staykov, Motonori Watanabe, Tatsumi Ishihara, Kazunari Yoshizawa

    Journal of Physical Chemistry C   118 ( 47 )   27539 - 27548   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp5081884

  • Four-layered [3.3]metacyclophane with ethenetetracarbonitrile 査読

    Masahiko Shibahara, Motonori Watanabe, Kenta Goto, Teruo Shinmyozu

    Acta Crystallographica Section E: Structure Reports Online   70 ( 5 )   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1107/S1600536814009362

  • Crystal structure of (E)-2-cyano-3-(12-methyl-12H-benzo[b]phenothiazin-11-yl)acrylic acid 査読

    Motonori Watanabe, Tatsumi Ishihara

    Acta Crystallographica Section E: Structure Reports Online   70 ( 9 )   o1026 - o1027   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1107/S1600536814018388

  • Crystal structure of a four-layered [3.3](3,5)pyridinophane 査読

    Masahiko Shibahara, Motonori Watanabe, Taisuke Matsumoto, Kenta Goto, Teruo Shinmyozu

    Acta Crystallographica Section E: Structure Reports Online   70 ( 11 )   447 - 450   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1107/S1600536814023691

  • Benzo[1,2-b:4,5-b′]dithiophene and benzo[1,2-b:4,5-b′]difuran based organic dipolar compounds for sensitized solar cells 査読

    109   81 - 89   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Novel organic dyes that consist of either a benzo[1,2-b:4,5-b′] dithiophene or a benzo[1,2-b:4,5-b′]difuran core exhibited remarkable solar-to-energy conversion efficiency in dye-sensitized solar cells. The planar geometry of bridge moiety and its bulky substituents helped the dyes to form a high quality monolayer on the surface of titanium oxide. A typical device displayed photon-to-current conversion efficiency 60% in the region of 380-575 nm, a short-circuit photocurrent density 13.45 mA cm
    -2
    , an open-circuit photovoltage 0.72 V, and a fill factor 0.63, corresponding to an overall conversion efficiency 6.12%. In a test of using deoxycholic acid as a co-absorbent, an improvement of quantum efficiencies 8.37% was observed for certain compounds. However, for others the quantum efficiency decreased in 6.60-7.91%. The latter result indicated that the quality of some films cannot be further improved by the addition of deoxycholic acid. The photophysical properties were analyzed with the aid of TDDFT.

    DOI: 10.1016/j.dyepig.2014.04.043

  • Acenes Generated from Precursors and Their Semiconducting Properties

    Motonori Watanabe, Kew-Yu Chen, Yuan Jay Chang, Tahsin J. Chow

    ACCOUNTS OF CHEMICAL RESEARCH   46 ( 7 )   1606 - 1615   2013年7月

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    記述言語:英語  

    DOI: 10.1021/ar400002y

  • A soluble precursor of hexacene and its application in thin film transistors 査読

    Motonori Watanabe, Wei Ting Su, Kew Yu Chen, Ching Ting Chien, Ting Han Chao, Yuan Jay Chang, Shun Wei Liu, Tahsin J. Chow

    Chemical Communications   49 ( 22 )   2240 - 2242   2013年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c3cc00278k

  • The synthesis and ambipolar charge transport properties of 1,2,3,4-tetrafluoropentacene 査読

    Ching Ting Chien, Ta Chung Chiang, Motonori Watanabe, Ting Han Chao, Yuan Jay Chang, Yan Duo Lin, Hung Kai Lee, Ching Yang Liu, Chih Hsin Tu, Chia Hsing Sun, Tahsin J. Chow

    Tetrahedron Letters   54 ( 8 )   903 - 906   2013年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2012.11.126

  • The synthesis and ambipolar charge transport properties of 1,2,3,4-tetrafluoropentacene

    Ching-Ting Chien, Ta-Chung Chiang, Motonori Watanabe, Ting-Han Chao, Yuan Jay Chang, Yan-Duo Lin, Hung-Kai Lee, Ching-Yang Liu, Chih-Hsin Tu, Chia-Hsing Sun, Tahsin J. Chow

    TETRAHEDRON LETTERS   54 ( 8 )   903 - 906   2013年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2012.11.126

  • Solution-processed optoelectronic properties of functionalized anthradifuran 査読

    Motonori Watanabe, Wei Teing Su, Yuan Jay Chang, Ting Han Chao, Yuh Sheng Wen, Tahsin J. Chow

    Chemistry - An Asian Journal   8 ( 1 )   60 - 64   2013年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/asia.201200834

  • Solution-Processed Optoelectronic Properties of Functionalized Anthradifuran

    Motonori Watanabe, Wei-Teing Su, Yuan Jay Chang, Ting-Han Chao, Yuh-Sheng Wen, Tahsin J. Chow

    CHEMISTRY-AN ASIAN JOURNAL   8 ( 1 )   60 - 64   2013年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/asia.201200834

  • Organic dyes containing oligo-phenothiazine for dye-sensitized solar cells 査読

    Yuan Jay Chang, Po Ting Chou, Yan Zuo Lin, Motonori Watanabe, Chih Jen Yang, Tsung Mei Chin, Tahsin J. Chow

    Journal of Materials Chemistry   22 ( 40 )   21704 - 21712   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c2jm35556f

  • Organic dyes containing oligo-phenothiazine for dye-sensitized solar cells

    Yuan Jay Chang, Po-Ting Chou, Yan-Zuo Lin, Motonori Watanabe, Chih-Jen Yang, Tsung-Mei Chin, Tahsin J. Chow

    JOURNAL OF MATERIALS CHEMISTRY   22 ( 40 )   21704 - 21712   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c2jm35556f

  • Tetracene-based field-effect transistors using solution processes 査読

    Ching Ting Chien, Chih Chun Lin, Motonori Watanabe, Yan Duo Lin, Ting Han Chao, Ta Chung Chiang, Xin Hua Huang, Yuh Sheng Wen, Chih Hsin Tu, Chia Hsing Sun, Tahsin J. Chow

    Journal of Materials Chemistry   22 ( 26 )   13070 - 13075   2012年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c2jm31134h

  • The synthesis, crystal structure and charge-transport properties of hexacene

    Motonori Watanabe, Yuan Jay Chang, Shun-Wei Liu, Ting-Han Chao, Kenta Goto, Md. Minarul Islam, Chih-Hsien Yuan, Yu-Tai Tao, Teruo Shinmyozu, Tahsin J. Chow

    NATURE CHEMISTRY   4 ( 7 )   574 - 578   2012年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/NCHEM.1381

  • The synthesis, crystal structure and charge-transport properties of hexacene 査読

    Motonori Watanabe, Yuan Jay Chang, Shun Wei Liu, Ting Han Chao, Kenta Goto, Md Minarul Islam, Chih Hsien Yuan, Yu Tai Tao, Teruo Shinmyozu, Tahsin J. Chow

    Nature Chemistry   4 ( 7 )   574 - 578   2012年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/nchem.1381

  • Solution processed high performance pentacene thin-film transistors 査読

    Ting Han Chao, Ming Jen Chang, Motonori Watanabe, Ming Hui Luo, Yuan Jay Chang, Tzu Chien Fang, Kew Yu Chen, Tahsin J. Chow

    Chemical Communications   48 ( 49 )   6148 - 6150   2012年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c2cc31754k

  • 2-Halo-subsituted tetracenes Their generation and single crystal OFET characteristics 査読

    Motonori Watanabe, Ting Han Chao, Ching Ting Chien, Shun Wei Liu, Yuan Jay Chang, Kew Yu Chen, Tahsin J. Chow

    Tetrahedron Letters   53 ( 18 )   2284 - 2287   2012年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2012.02.060

  • 2-Halo-subsituted tetracenes: their generation and single crystal OFET characteristics

    Motonori Watanabe, Ting-Han Chao, Ching-Ting Chien, Shun-Wei Liu, Yuan Jay Chang, Kew-Yu Chen, Tahsin J. Chow

    TETRAHEDRON LETTERS   53 ( 18 )   2284 - 2287   2012年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2012.02.060

  • High-performance organic materials for dye-sensitized solar cells Triarylene-linked dyads with a 4-tert-butylphenylamine donor 査読

    Yuan Jay Chang, Po Ting Chou, Szu Yu Lin, Motonori Watanabe, Zhi Qian Liu, Ju Ling Lin, Kew Yu Chen, Shih Sheng Sun, Ching Yang Liu, Tahsin J. Chow

    Chemistry - An Asian Journal   7 ( 3 )   572 - 581   2012年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/asia.201100777

  • High-Performance Organic Materials for Dye-Sensitized Solar Cells: Triarylene-Linked Dyads with a 4-tert-Butylphenylamine Donor

    Yuan Jay Chang, Po-Ting Chou, Szu-Yu Lin, Motonori Watanabe, Zhi-Qian Liu, Ju-Ling Lin, Kew-Yu Chen, Shih-Sheng Sun, Ching-Yang Liu, Tahsin J. Chow

    CHEMISTRY-AN ASIAN JOURNAL   7 ( 3 )   572 - 581   2012年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/asia.201100777

  • Phenothiazine derivatives as organic sensitizers for highly efficient dye-sensitized solar cells 査読

    Chih Jen Yang, Yuan Jay Chang, Motonori Watanabe, Yung Son Hon, Tahsin J. Chow

    Journal of Materials Chemistry   22 ( 9 )   4040 - 4049   2012年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c2jm13961h

  • Paracyclophane as a bridging unit in the design of organic dyes for sensitized solar cells 査読

    Yuan Jay Chang, Motonori Watanabe, Po Ting Chou, Tahsin J. Chow

    Chemical Communications   48 ( 5 )   726 - 728   2012年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c1cc16248a

  • Synthesis and redox properties of π-conjugated 4,5-diazafluorene derivatives incorporating 9-cyanomethylene moiety as an electron acceptor 査読

    52 ( 44 )   5865 - 5868   2011年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We have synthesized p-conjugated acceptor-type molecules 3a-d containing a cyanomethylene unit as the electron acceptor site and a 4,5-diazafluorene ligand for metal complexation. In the crystal, the planar 3a molecules stack along the b axis in the head-to-tail fashion. Compound 3a shows distinctive electrochromism and its three differently colored redox states (dianion (3 2-), anion radical (3.-), neutral (3)) exhibit remarkable stability.

    DOI: 10.1016/j.tetlet.2011.08.164

  • Synthesis and redox properties of pi-conjugated 4,5-diazafluorene derivatives incorporating 9-cyanomethylene moiety as an electron acceptor

    Katsuya Sako, Yasufumi Mugishima, Tetsuo Iwanaga, Shinji Toyota, Hiroyuki Takemura, Motonori Watanabe, Teruo Shinmyozu, Michito Shiotsuka, Hitoshi Tatemitsu

    TETRAHEDRON LETTERS   52 ( 44 )   5865 - 5868   2011年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2011.08.164

  • Structural properties of charge-transfer complexes of four- and five-layered [3.3]metacyclophanes 査読

    Masahiko Shibahara, Motonori Watanabe, Chang Yuan, Teruo Shinmyozu

    Tetrahedron Letters   52 ( 39 )   5012 - 5015   2011年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2011.07.060

  • Structural properties of charge-transfer complexes of four- and five-layered [3.3]metacyclophanes

    Masahiko Shibahara, Motonori Watanabe, Chang Yuan, Teruo Shinmyozu

    TETRAHEDRON LETTERS   52 ( 39 )   5012 - 5015   2011年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2011.07.060

  • Solution-processed organic micro crystal transistor based on tetraceno[2,3-b]thiophene from a monoketone precursor 査読

    Motonori Watanabe, Ting Han Chao, Shun Wei Liu, Ching Ting Chien, Yuan Jay Chang, Chih Hsien Yuan, Kuan Chun Huang, Shu Hua Chien, Teruo Shinmyozu, Tahsin J. Chow

    Journal of Materials Chemistry   21 ( 30 )   11317 - 11322   2011年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c1jm11834j

  • Structural properties of charge-transfer complexes of multilayered [3.3]paracyclophanes 査読

    Masahiko Shibahara, Motonori Watanabe, Chang Yuan, Kenta Goto, Teruo Shinmyozu

    Tetrahedron Letters   52 ( 26 )   3371 - 3375   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2011.04.087

  • Structural properties of charge-transfer complexes of multilayered [3.3]paracyclophanes

    Masahiko Shibahara, Motonori Watanabe, Chang Yuan, Kenta Goto, Teruo Shinmyozu

    TETRAHEDRON LETTERS   52 ( 26 )   3371 - 3375   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2011.04.087

  • Delocalization of positive charge in π-stacked multi-benzene rings in multilayered cyclophanes 査読

    115 ( 5 )   741 - 746   2011年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In the present study, delocalization of a positive charge in π-stacked multi-benzene rings in multilayered para-and meta-cyclophanes, in which benzene rings are connected by propyl chains to form a chromophore array with the face-to-face structure, was investigated by means of transient absorption spectroscopy during the pulse radiolysis using dichloroethane as a solvent. The local excitation and charge resonance (CR) bands were successfully observed. It was revealed that the CR band shifted to the longer wavelength side with the number of the benzene rings. The stabilization energy estimated from the peak position of the CR band showed the efficient charge delocalization over the cyclophanes. Furthermore, the CR bands showed the slight spectral change attributable to the change in distribution of the conformers. The substantially long lifetime of the CR band can be explained on the basis of the smaller charge distribution on the outer layers of the multilayered cyclophanes.

    DOI: 10.1021/jp110916m

  • Delocalization of Positive Charge in pi-Stacked Multi-benzene Rings in Multilayered Cyclophanes

    Mamoru Fujitsuka, Sachiko Tojo, Masahiko Shibahara, Motonori Watanabe, Teruo Shinmyozu, Tetsuro Majima

    JOURNAL OF PHYSICAL CHEMISTRY A   115 ( 5 )   741 - 746   2011年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp110916m

  • 2,1,3-benzothiadiazole dimers Preparation, structure, and transannular electronic interactions of syn-and anti-[2.2](4,7)benzothiadiazolophanes 査読

    Motonori Watanabe, Kenta Goto, Mamoru Fujitsuka, Sachiko Tojo, Tetsuro Majima, Teruo Shinmyozu

    Bulletin of the Chemical Society of Japan   83 ( 10 )   1155 - 1161   2010年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/bcsj.20100085

  • 2,1,3-Benzothiadiazole Dimers: Preparation, Structure, and Transannular Electronic Interactions of syn- and anti-[2.2](4,7)Benzothiadiazolophanes

    Motonori Watanabe, Kenta Goto, Mamoru Fujitsuka, Sachiko Tojo, Tetsuro Majima, Teruo Shinmyozu

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   83 ( 10 )   1155 - 1161   2010年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/bcsj.20100085

  • Synthesis, structure, and electronic and photophysical properties of two- and three-layered [3.3]Paracyclophane-based donor-acceptor systems (1) 査読

    Motonori Watanabe, Kenta Goto, Masahiko Shibahara, Teruo Shinmyozu

    Journal of Organic Chemistry   75 ( 18 )   6104 - 6114   2010年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jo100688m

  • Synthesis, Structure, and Electronic and Photophysical Properties of Two- and Three-Layered [3.3]Paracyclophane-Based Donor-Acceptor Systems

    Motonori Watanabe, Kenta Goto, Masahiko Shibahara, Teruo Shinmyozu

    JOURNAL OF ORGANIC CHEMISTRY   75 ( 18 )   6104 - 6114   2010年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jo100688m

  • A conformational study of [3.3](3,5)pyridinophane 査読

    Masahiko Shibahara, Motonori Watanabe, Masahiko Suenaga, Keiko Ideta, Taisuke Matsumoto, Teruo Shinmyozu

    Tetrahedron Letters   50 ( 12 )   1340 - 1344   2009年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2009.01.051

  • A conformational study of [3.3](3,5)pyridinophane

    Masahiko Shibahara, Motonori Watanabe, Masahiko Suenaga, Keiko Ideta, Taisuke Matsumoto, Teruo Shinmyozu

    TETRAHEDRON LETTERS   50 ( 12 )   1340 - 1344   2009年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.tetlet.2009.01.051

  • Synthesis of multilayered [3.3](3,5)pyridinophanes 査読

    Masahiko Shibahara, Motonori Watanabe, Kazuhiro Aso, Teruo Shinmyozu

    Synthesis   ( 23 )   3749 - 3754   2008年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1055/s-0028-1083633

  • Synthesis of Multilayered [3.3](3,5)Pyridinophanes

    Masahiko Shibahara, Motonori Watanabe, Kazuhiro Aso, Teruo Shinmyozu

    SYNTHESIS-STUTTGART   ( 23 )   3749 - 3754   2008年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1055/s-0028-1083633

  • Optical Resolution, Absolute Configuration, and Chiroptical Properties of Three-Layered [3.3]Paracyclophane

    Atsuya Muranaka, Masahiko Shibahara, Motonori Watanabe, Taisuke Matsumoto, Teruo Shinmyozu, Nagao Kobayashi

    JOURNAL OF ORGANIC CHEMISTRY   73 ( 22 )   9125 - 9128   2008年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jo801441h

  • Optical resolution, absolute configuration, and chiroptical properties of three-layered [3.3]paracyclophane 査読

    Atsuya Muranaka, Masahiko Shibahara, Motonori Watanabe, Taisuke Matsumoto, Teruo Shinmyozu, Nagao Kobayashi

    Journal of Organic Chemistry   73 ( 22 )   9125 - 9128   2008年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jo801441h

  • Synthesis, structure, and transannular pi-pi interaction of three- and four-layered [3.3]paracyclophanes (vol 73, pg 4441, 2008)

    Masahiko Shibahara, Motonori Watanabe, Tetsuo Twanaga, Taisuke Matsumoto, Keiko Ideta, Teruo Shinmyozu

    JOURNAL OF ORGANIC CHEMISTRY   73 ( 15 )   6052 - 6052   2008年8月

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    記述言語:英語  

    DOI: 10.1021/jo8013484

  • Synthesis, structure, and transannular π-π interaction of three-and four-layered [3.3]paracyclophanes (Journal of Organic Chemistry (2008) 73, (4441)) 査読

    73 ( 15 )   6052   2008年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jo8013484

  • Synthesis, structure, and transannular π-π interaction of three- and four-layered [3.3]paracyclophanes 査読

    73 ( 12 )   4433 - 4442   2008年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    (Figure Presented) The synthesis of three- and four-layered [3.3]paracyclophanes ([3.3]PCPs) 3-5 has been accomplished by utilizing the (p-ethylbenzenesulfonyl)methyl isocyanide (EbsMIC) method. The structures of the three- to four-layered [3.3]PCPs 3-5 and their diones 8, 10, and 11 have been elucidated based on the 1H NMR spectra and finally by X-ray structural analysis. In the three-layered [3.3]PCP-dione 8, the trimethylene bridges of the [3.3]PCP unit assume a chair conformation similar to that of 2, while the [3.3]PCP-2,11-dione unit assumes a boat conformation different from that of [3.3]PCP-dione 1 with a chair conformation. On the other hand, the two [3.3]PCP units in three-layered [3.3]PCP 3 both assume a boat conformation. In the four-layered [3.3]PCP-dione 10, the two outer [3.3]PCP units assume a boat conformation while the inner dione unit has a chair conformation. The trimethylene bridges in the four-layered [3.3]PCP 4 are highly disordered even at -150°C. All the outer benzene rings are distorted into a boat form while the inner ones are distorted into a twist form. In the electronic spectra, bathochromic shift and hyperchromic effect are observed, but the magnitude decreases with an increase in the number of layers and the spectra become structureless. In the charge-transfer (CT) bands of the three- to four-layered [3.3]PCPs 3-5 with tetracyanoethylene (TCNE), two absorption maxima (λmax) are observed. The effect of an increase in the layers becomes significant, and the changes in the longest wavelength λmax values from two to three and three to four are ca. 60 and 50 nm, respectively. By comparison of the stereoisomeric four-layered [3.3]PCPs 4 (meso) and 5 (racemic), the helical arrangement of the trimethylene bridges of 5 shows a more efficient transannular π-electronic interaction. In the three- to four-layered [3.3]PCP-diones, a magnitude of the CT interaction almost comparable to that of [3.3]PCP 2 was observed, and this indicates that the -CH2COCH2- bridges inhibit the CT interaction and that this tendency is supported by the calculated HOMO energy levels and observed oxidation potentials. Three- and four-layered [3.3]PCPs 3-5 show reversible redox processes, and 4 and 5 show an electron-donating ability almost comparable to that of [36]CP. Very good correlation between the λλmax of the CT bands with TCNE and the oxidation potentials is observed.

    DOI: 10.1021/jo8003309

  • Synthesis, structure, and transannular pi-pi interaction of three- and four-layered [3.3]paracyclophanes

    Masahiko Shibahara, Motonori Watanabe, Tetsuo Iwanaga, Taisuke Matsumoto, Keiko Ideta, Teruo Shinmyozu

    JOURNAL OF ORGANIC CHEMISTRY   73 ( 12 )   4433 - 4442   2008年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jo8003309

  • Synthesis, structure, and transannular π-π interaction of multilayered [3.3]metacyclophanes 査読

    72 ( 8 )   2865 - 2877   2007年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    (Figure Presented) The synthesis of a series of three- to six-layered [3.3]metacyclophanes ([3.3]MCPs) 3-6 has been successfully accomplished by the (p-tolylsulfonyl)methyl isocyanide (TosMIC) method as a critical coupling reaction. Their important synthetic intermediates are the two- and three-layered bis(bromomethyl) compounds 11, 17, 21, and tetrakis(bromomethyl) compounds 25 and 28. The structures of the three- to six-layered [3.3]MCPs (3-6) as well as three- to six-layered [3.3]MCP-di- (22-24) and tetraones (26, 27, and 29) as the synthetic intermediates have been elucidated based on the 1H NMR data and X-ray structural analysis. These multilayered cyclophanes are constructed with two different geometries, syn[3.3]MCP and anti-[3.3]MCP-2,11- dione. In principle, their geometries are maintained in the multilayered [3.3]MCPs, but deformation of the dihedral angle of the two benzene rings of the syn-[3.3]MCP moiety is generally observed. In the four-layered MCP 4, the central [3.3]MCP moiety takes an anti geometry. These data indicate the structural flexibility of the [3.3]MCP moiety. In the electronic spectra, rather simple and structureless absorption curves are observed, and the most significant spectral change is observed for the two to three layers and becomes less effective even if it is more layered. In the charge-transfer (CT) bands of the multilayered [3.3]MCPs with tetracyanoethylene (TCNE), the λmaxmax gradually shifts to the longer wavelength region, but the extent of the shift is much smaller as the number of layers increases. In the multilayered [3.3]MCP-di- and tetraones, the anti-[3.3]MCP-dione moiety works as an insulator. Therefore, the CT interaction of the four- and five-layered [3.3]MCPs with one anti-[3.3]MCP-dione moiety (23 and 24) shows the almost comparable magnitude of the interaction with the two- and three-layered [3.3]MCPs (2 and 3), respectively. The tetraones of the three and four-layered MCPs (29 and 26) do not show CT interactions except for the six-layered MCP 27.

    DOI: 10.1021/jo062220m

  • Multilayered [3.3]cyclophanes, Part 1. Synthesis, structure, and transannular pi-pi interaction of multilayered [3.3]Metacyclophanes(1)

    Masahiko Shibahara, Motonori Watanabe, Tetsuo Iwanaga, Keiko Ideta, Teruo Shinmyozu

    JOURNAL OF ORGANIC CHEMISTRY   72 ( 8 )   2865 - 2877   2007年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jo062220m

  • Enhancement of solid base activity for porous boron nitride catalysts by controlling active structure using post treatment 招待 査読 国際誌

    Atsushi Takagaki, Shohei Nakamura, Motonori Watanabe, Yoonyoung Kim, Jun Tae Song, Keiko Jimura, Kanta Yamada, Masaaki Yoshida, Shigenobu Hayashi, Tatsumi Ishihara

    1900年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

▼全件表示

書籍等出版物

  • Hydrogen Energy Engineering, Part of the series Green Energy and Technology Eds. Kazunari Sasaki et al

    Aleksandar Staykov, Stephen M. Lyth, Motonori Watanabe( 担当: 共著)

    Springer book  2016年9月 

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    担当ページ:pp 159-174 (Photocatalytic Water Splitting)   記述言語:英語   著書種別:学術書

  • Synthesis, structure, and electronic and photophysical properties of donor–acceptor cyclophanes

    2014年1月 

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    担当ページ:95-136   記述言語:英語  

  • Solution-processed acenes and their applications on field-effect transistor

    Motonori Watanabe, Tahsin J. Chow

    Pan Stanford Publishing Pte. Ltd.  2014年1月 

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    担当ページ:455-486   記述言語:英語  

講演・口頭発表等

  • Study of stable visible-near infrared sensitized photocatalyst using BODIPY dye 国際会議

    Motonori Watanabe

    The 13th Taiwan-Japan Bilateral Symposium on Architecture of Functional Organic Molecules  2023年10月 

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    開催年月日: 2023年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:台湾  

  • Design of organic-inorganic composite photocatalyst for visible light driven water splitting hydrogen production 招待 国際会議

    Motonori Watanabe

    Ming Chi University of Technology seminar  2023年10月 

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    開催年月日: 2023年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:台湾  

  • Design of effective charge separation in dye-sensitized photocatalyst 招待 国際会議

    Motonori Watanabe

    The Sino-Japan Symposium on Environmental Catalysis (SSEC) 2023  2023年8月 

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    開催年月日: 2023年8月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    国名:日本国  

  • Pyridyl-anchored BODIPY Sensitizer-TiO2 Photocatalyst for Enhanced Near-infrared Light-Driven Photocatalytic Hydrogen Production

    Xiao-Feng Shen, Motonori Watanabe*, Atsushi Takagaki, Jun Tae Song, Tatsumi Ishihara.

    The 32nd Symposium on Physical Organic Chemistry  2022年9月 

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    開催年月日: 2023年6月

    記述言語:日本語  

    国名:日本国  

  • BODIPY Sensitizer-TiO2 Photocatalyst for Enhanced Visible to Near-infrared Light-Driven Photocatalytic Hydrogen Productio 国際会議

    Xiao-Feng Shen, Motonori Watanabe*, Atsushi Takagaki, Jun Tae Song, Tatsumi Ishihara.

    18th Japan-Korea Symposium on Catalysis (18JKSC)  2021年11月 

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    開催年月日: 2023年6月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Design of stable dye-sensitized photocatalyst for photocatalytic hydrogen production in water medium 招待 国際会議

    Motonori Watanabe

    2021 International Symposium on Catalysis for Renewable Energy and Air Pollution Control: Virtual Symposium  2021年11月 

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    開催年月日: 2023年6月

    記述言語:英語  

    国名:日本国  

  • BODIPY-containing D- π-A type sensitized TiO2 photocatalyst for H2 production under NIR light 招待 国際会議

    2022年7月 

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    開催年月日: 2023年6月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:July 11, 2022, Hiroshima   国名:日本国  

  • D- π-A type sensitized TiO2 photocatalyst for H2 production 招待 国際会議

    2022年7月 

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    開催年月日: 2023年6月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:July 22-23,2022, Minamiaso, Kumamoto.   国名:日本国  

  • D- π-A type sensitized TiO2 photocatalyst for H2 production 招待 国際会議

    2022年7月 

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    開催年月日: 2022年7月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Minamiaso, Kumamoto.   国名:日本国  

  • Stable dye-sensitized photocatalytic hydrogen production in water medium 招待 国際会議

    Motonori Watanabe

    The 18th Asian Chemical Congress (18th ACC)  2019年12月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    国名:台湾  

  • Synthesis of the Ethynyl-substituent functionalized difuranoanthracene and physical property

    Motonori Watanabe, Yasutaka Doi, Hidehisa Hagiwara, Aleksandar Staykov, Taisuke Matsumoto, Teruo Shinmyozu, Shintaro Ida, Tatsumi Ishihara

    26th Symposium on Physical Organic Chemistry  2015年9月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Impact of Alkoxy Chain Length on Carbazole-based, Visible Light-driven, Dye Sensitized Photocatalytic Hydrogen Production

    Motonori Watanabe, Hidehisa Hagiwara, Yudai Ogata, Aleksandar Staykov, Sean R. Bishop, Nicola H. Perry, Yuan Jay Chang, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    2015年10月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Furan-contained oligoacene and opt-electronic application 招待 国際会議

    Motonori Watanabe, Yuan Jay Chang, Kenta Goto, Masahiko Shibahara, Teruo Shinmyozu, Tatsumi Ishihara, and Tahsin J Chow

    International Symposium on Construction and Application of Functional Molecules /System  2015年10月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Organic-Semiconductor hybrid photocatalyst for photocatalytic hydrogen production

    Motonori Watanabe

    2016年5月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Organic Dye Sensitized Visible Light Driven Photocatalytic Hydrogen Production from Water 国際会議

    Motonori Watanabe

    2nd International Symposium on Chemical Energy Conversion Processes (ISCECP-2)  2016年5月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Organic Dye-Inorganic Semiconductor Hybrid Catalyst: Visible Light Driven Photocatalytic Hydrogen Production 国際会議

    Motonori Watanabe

    Joint UNSW-I2CNER Workshop  2016年6月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Small Band-Gap Organic Materials for Opt-Electronic Application and Energy Conversion 招待 国際会議

    Motonori Watanabe

    2016年6月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Synthesis, Structure, and Physical Properties of Tetracene ligand and its [FeFe] hydrogenase mimic metal complex for photocatalyst

    Motonori Watanabe

    27th Symposium on Physical Organic Chemistry  2016年9月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Novel Acene as Semiconducting Materials for Opt-Electronic and Energy Devices 招待

    Motonori Watanabe

    Invited Seminar, Nagoya Technology University  2016年11月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  • Organic-inorganic composite photocatalysts for hydrogen production 招待 国際会議

    Motonori Watanabe

    2017 INTERNATIONAL SYMPOSIUM FOR ADVANCED MATERIALS RESEARCH (ISAMR 2017)  2017年8月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Synthesis and physical property of brominated hexacene

    Motonori Watanabe

    Structural Organic Chemistry for Young Researchers symposium 2017  2017年8月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Development of synthesis method of acenes and application to functional organic materials / devices 招待

    Motonori Watanabe

    Organic Synthesis Association Kyushu Yamaguchi Branch, 29th Seminar for Young Researcher  2017年8月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Modification of organic molecule structure for opt-electronic devices in photocatalytic hydrogen production in water medium 招待 国際会議

    Motonori Watanabe

    The 10th Taiwan-Japan Bilateral Symposium on Architecture of Functional Organic Molecules  2017年10月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Physical properties of hexacenes and thin-film state hole-transfer properties 招待 国際会議

    Motonori Watanabe

    The 11th Taiwan-Japan Bilateral Symposium on Architecture of Functional Organic Molecules  2018年5月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Modification of organic molecule structure for opt-electronic devices in photocatalytic hydrogen production in water medium 国際会議

    Motonori Watanabe

    European Materials Research Society Spring Meeting 2018, The Convention Centre of Strasbourg  2018年6月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Design of organic-inorganic composite photocatalyst for visible light driven water splitting hydrogen production 招待 国際会議

    Motonori Watanabe

    European Materials Research Society Spring Meeting 2018, The Convention Centre of Strasbourg (France)  2018年6月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Synthesis and physical properties of brominated hexacene and hole-transfer properties of thin-film transistors

    Motonori Watanabe, Takaaki Miyazaki, Toshinori Matsushima, Junko Matsuda, Ching Ting Chein, Masahiko Shibahara, Chihaya Adachi, Shih Sheng Sun, Tahsin J. Chow, Tatsumi Ishihara

    29th Symposium on Physical Organic Chemistry  2018年9月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Synthesis of Higher Acene from Soluble Precursors

    Motonori Watanabe

    Fuzzy bond Conference  2018年9月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    国名:日本国  

  • Photocatalytic water decomposition using soluble acene-inorganic composite catalyst

    Motonori Watanabe, Hidehisa Hagiwara, Tatsumi Ishihara

    Structural Organic Chemistry Mini Symposium. The University of Shiga Prefecture  2018年9月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Pyridyl anchored stable dye-sensitized hydrogen production in water medium 国際会議

    Motonori Watanabe

    2019 Spring Meeting  2019年5月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    国名:フランス共和国  

  • Anchor group effect for stable dye-sensitized hydrogen production in water medium 招待 国際会議

    Motonori Watanabe

    The 12th Taiwan-Japan Bilateral Symposium on Architecture of Functional Organic Molecules  2019年8月 

     詳細を見る

    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    国名:台湾  

  • Organic dye modified visible light driven photocatalytic water decomposition for hydrogen production 招待 国際会議

    Motonori Watanabe

    2015 Fall Symposium of Photochemistry Association in Taiwan  2015年9月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Synthesis and property of hexacene from precursor.

    Motonori Watanabe, Kenta Goto, Teruo Shinmyozu, Tahsin J Chow

    93th Annual Meeting of The Chemical Society of Japan,  2013年5月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • A Novel Phenothiazine Derivative Organic Dye for Photocatalytic Water Splitting Reaction 国際会議

    Motonori Watanabe, Hidehisa Hagiwata, Tatsumi Ishihara

    15th International Symposium on Novel Aromatic Compounds  2013年7月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • A Novel Organic Dye for Photocatalytic Water Splitting Reaction

    Motonori Watanabe, Hidehisa Hagiwata, Tatsumi Ishihara

    24th Symposium on Physical Organic Chemistry  2013年9月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Synthesis and opt-electronic properties of TIPS-substituent higher difranoacenes

    Motonori Watanabe, Yuan Jay Chang, Masahiko Shibahara, Kenta Goto, Teruo Shinmyozu, Tahsin J Chow

    2013年12月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Novel Phenothiazine-Derived Organic Dyes for Visible-Light-Driven Dye-Sensitized Photocatalytic Hydrogen Production 国際会議

    Motonori Watanabe, Hidehisa Hagiwara, Aoi Iribe, Kenta Shiomi, Shintaro Ida, Tatsumi Ishihara

    International Conference on Hydrogen Production-2014  2014年2月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Synthesis of Novel higher difranoacenes

    Motonori Watanabe, Masahiko Shibahara, Kenta Goto, Teruo Shinmyozu, Tahsin J Chow

    94th Annual Meeting of The Chemical Society of Japan  2014年5月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Spacer Effects in Metal-Free Organic Dyes for Visible-Light Driven Dye-Sensitized Photocatalytic Hydrogen Production 国際会議

    Motonori Watanabe, Hidehisa Hagiwara, Aoi Iribe, Yudai Ogata, Kenta Shiomi, Aleksandar Staykov, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    Pre-symposium TOCAT7 in Fukuoka  2014年5月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Benzophenothiazine containing Donor-Acceptor Dyads for Photocatalytic Water Splitting Hydrogen Production Reaction

    Motonori Watanabe, Hidehisa Hagiwara, Aoi Iribe, Yudai Ogata, Kenta Shiomi, Aleksandar Staykov, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    51th Kitakytushu Symposium on Related with Chemistry-Associated Branch  2014年6月 

     詳細を見る

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Novel Donor-Acceptor Organic Molecules for Visible Light Driven Photocatalytic Dye-Sensitized Water Splitting Hydrogen Production 招待 国際会議

    Motonori Watanabe

    International Conference for Top and Emerging Materials Scientists  2014年7月 

     詳細を見る

    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • An Impact of Alkyl Chain Effect in Metal-Free Organic Dyes for Visible-Light-Driven Dye-Sensitized Photocatalytic Hydrogen Production

    Motonori Watanabe, Hidehisa Hagiwara Yudai Ogata, Aleksandar Staykov, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    25th Symposium on Physical Organic Chemistry,  2014年9月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Synthesis, Structure, and Physical Property of Novel Difuranoacene

    Motonori Watanabe, Yasutaka Doi, Hidehisa Hagiwara, Shintaro Ida, Tatsumi Ishihara

    2014年11月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • An impact of alkyl chain length for water splitting performance in carbazole-based visible light driven dye-sensitized water splitting hydrogen production 国際会議

    Motonori WATANABE, Hidehisa HAGIWARA, Yudai OGATA, Shen BISHOP, Shintaro IDA, Tanaka KEIJI, Tatsumi ISHIHARA

    International Conference on Artificial Photosynthesis (ICARP2014),  2014年11月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Novel Metal-Free Donor-Spacer-Acceptor Dyads for Visible Light Driven Dye-Sensitized Water Splitting Hydrogen Production 招待 国際会議

    Motonori Watanabe

    The 8th Taiwan-Japan Bilateral Symposium on Architecture of Functional Organic Molecules,  2014年11月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Synthesis, Structure, and Physical Property of Novel Difuranoacene

    Motonori Watanabe, Yasutaka Doi, Hidehisa Hagiwara ,Shintaro Ida, Tatsumi Ishihara

    52th Kitakytushu Symposium on Related with Chemistry-Associated Branch  2015年1月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

  • Visible light driven photocatalytic water decomposition for hydrogen production

    Motonori Watanabe

    Mini-Symposium for Young Researchers in Structure for Organic Chemistry  2015年8月 

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

▼全件表示

MISC

所属学協会

  • 有機合成化学協会

  • 日本化学会

学術貢献活動

  • 実行委員 国際学術貢献

    2023年10月

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    種別:大会・シンポジウム等 

  • 実行委員

    2023電気化学秋季大会  ( 九州大学 伊都キャンパス ) 2023年9月

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    種別:大会・シンポジウム等 

  • 学術論文等の審査

    役割:査読

    2023年

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    種別:査読等 

    外国語雑誌 査読論文数:66

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:0

    国内会議録 査読論文数:0

  • 学術論文等の審査

    役割:査読

    2021年

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    種別:査読等 

    外国語雑誌 査読論文数:78

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:0

    国内会議録 査読論文数:0

  • 学術論文等の審査

    役割:査読

    2020年

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    種別:査読等 

    外国語雑誌 査読論文数:40

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:0

    国内会議録 査読論文数:0

  • 学術論文等の審査

    役割:査読

    2019年

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    種別:査読等 

    外国語雑誌 査読論文数:27

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:0

    国内会議録 査読論文数:0

  • Applied Phhysics A 国際学術貢献

    2018年7月 - 2029年12月

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    種別:学会・研究会等 

  • 学術論文等の審査

    役割:査読

    2018年

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    種別:査読等 

    外国語雑誌 査読論文数:20

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:0

    国内会議録 査読論文数:0

  • 実行委員長 国際学術貢献

    ( 宮﨑研シーガイアコンベンションセンター ) 2017年10月

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    種別:大会・シンポジウム等 

  • 実行委員

    第28回基礎有機化学討論会  ( 九州大学伊都キャンパス ) 2017年9月

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    種別:大会・シンポジウム等 

  • 学術論文等の審査

    役割:査読

    2017年

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    種別:査読等 

    外国語雑誌 査読論文数:21

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:0

    国内会議録 査読論文数:0

  • 学術論文等の審査

    役割:査読

    2016年

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    種別:査読等 

    外国語雑誌 査読論文数:10

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:0

    国内会議録 査読論文数:0

  • 学術論文等の審査

    役割:査読

    2015年

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    種別:査読等 

    外国語雑誌 査読論文数:9

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:0

    国内会議録 査読論文数:0

  • 実行委員 国際学術貢献

    ( 九州大学箱崎キャンパス ) 2014年11月

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    種別:大会・シンポジウム等 

  • 学術論文等の審査

    役割:査読

    2014年

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    種別:査読等 

    外国語雑誌 査読論文数:12

    日本語雑誌 査読論文数:0

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    国内会議録 査読論文数:0

  • 学術論文等の審査

    役割:査読

    2013年

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    種別:査読等 

    外国語雑誌 査読論文数:2

    日本語雑誌 査読論文数:0

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    国内会議録 査読論文数:0

▼全件表示

共同研究・競争的資金等の研究課題

  • 三重項状態利用を増進する広帯領域増感色素の開拓と光電気水分解デバイスへの応用

    研究課題/領域番号:24H00486  2025年 - 2028年

    日本学術振興会  科学研究費助成事業  基盤研究(A)

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    担当区分:研究代表者  資金種別:科研費

  • 先端国際共同研究推進事業 次世代のためのASPIRE「光電解デバイス電極における高速電荷輸送のための有機-無機複合界面に関する国際頭脳循環」 国際共著

    2024年2月 - 2027年3月

    九州大学 

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    担当区分:研究代表者 

    水素は有用なエネルギーキャリアとして着目されているが、カーボンニュートラルの観点から、二酸化炭素を非発生、または有用分子へ変換可能な技術に伴った水素生産方法が必要である。太陽光エネルギーを用いて光触媒によって水素を製造する手法は二酸化炭素を排出しない最も理想的な方法であるが、実用化に向けて高い太陽光エネルギー変換効率を示す研究が世界的に加速している。本研究は、可視光・近赤外応答型有機色素・ハライドペロブスカイトや高活性無機材料で形成される界面での電荷分離の高速化による太陽光エネルギー変換効率の向上を目的とし、薄膜成膜技術や助触媒表面処理の実績を有するスイス国チームと国際共同研究を行い、有機・無機界面高速電荷輸送のための薄膜作製並びに放射光による膜構造解析を行う。両国チームによる頭脳循環の促進のための若手研究者の交流研究を通して有機・無機界面科学のネットワーク形成を進める。

  • 光電解デバイス電極における高速電荷輸送のための有機-無機複合界面に関する国際頭脳循環

    2024年 - 2028年

    科学研究費補助金 (文部科学省)

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    担当区分:研究代表者  資金種別:受託研究

  • 基盤研究C「剥離能を有する色素材料を用いた分散型色素増感複合ナノシートの開発と光触媒応用」

    2021年5月

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    担当区分:研究代表者 

  • 剥離能を有する色素材料を用いた分散型色素増感複合ナノシートの開発と光触媒応用

    研究課題/領域番号:21K04692  2021年 - 2023年

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    担当区分:研究代表者  資金種別:科研費

  • International Cooperation Add-on Project, Ministry of Science and Technology (MOST), Taiwan, ‘’Synthesis of higher acenes and their derivatives’’. Jan.1-July.31, 2019 国際共著

    2019年6月

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    担当区分:研究代表者 

    本研究では高次アセン類の新規合成法の開発と、その手法を応用した新規アセン類の合成、物性評価、そしてデバイス展開を目的とする。

  • 液体‐半固体‐固体試料を測定可能にする共通機器・核磁気共鳴装置の構築

    2019年

    2019年度~2019年度, 若手研究者研究環境整備経費(九州大学ルネッサンスプロジェクト)

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    担当区分:研究代表者  資金種別:学内資金・基金等

  • 2018年度 日揮・実吉奨学会研究助成金「可視光‐近赤外応答色素ハイブリッド増感型光触媒による革新的水分解系の開発と水素製造」

    2018年9月 - 2019年8月

    九州大学カーボンニュートラルエネルギー国際研究所 

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    担当区分:研究代表者 

    これまでに報告されている幅広い光を吸収できる光触媒の系は、無機材料あるいは、ポルフィリンと呼ばれる、光合成色素を模倣したものに限られた。しかしながら、これらの系は幅広い吸収帯を有するものの、吸収強度は近赤外部分では非常に弱く、その性能は限られていた。本申請では申請者がこれまでに開発してきた色素群に、さらに太陽光のうち50%光エネルギー源として利用可能な近赤外部分をカバー可能な色素を組み合わせ、より広範囲に太陽光をカバーし、従来に比べて50%高効率化可能な革新的光→エネルギー変換による水からの水素製造を目指す。

  • 脱カルボニル芳香族環反応を利用した一段階シクラセン合成

    研究課題/領域番号:17K19123  2018年 - 2019年

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

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    担当区分:研究代表者  資金種別:科研費

  • 可視光‐近赤外応答色素ハイブリッド増感型光触媒による革新的水分解系の開発と水素製造

    2018年 - 2019年

    日揮・実吉奨学会研究助成金

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    担当区分:研究代表者  資金種別:受託研究

  • 若手研究(A) 「有機鉄錯体を助触媒とした貴金属フリー光触媒系の開発」

    2017年4月 - 2020年3月

    九州大学カーボンニュートラルエネルギー国際研究所 

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    担当区分:研究代表者 

    本研究では水素を生産する酵素ヒドロゲナーゼの鉄錯体構造に注目し、これを模倣した白金に替わる新規有機鉄系助触媒の開発を行い、光触媒に適切に組み込んだ「非貴金属系ハイブリッド光触媒」による水分解水素製造と、白金に変わる新たな鉄系助触媒の有用性を実証する。過去の鉄錯体のスクリーニング並びに有機鉄錯体助触媒を開発し、その物性を明らかにするとともに、無機酸化物と鉄錯体助触媒を組み合わせ、光触媒のモデルを作るこ とを目的とし、研究を行う。

  • 挑戦的研究(萌芽) 「脱カルボニル芳香族環反応を利用した一段階シクラセン合成」

    2017年4月 - 2019年3月

    九州大学カーボンニュートラルエネルギー国際研究所 

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    担当区分:研究代表者 

    本研究は、シクラセン骨格を形成可能な前駆体を合成し、化学反応に代わる熱・光に よる温和な条件を刺激とした反応により目的となるシクラセンを達成しようとするものである。目的となるシク ラセン骨格の出発原料としてノルボルナジエン骨格を選択したところ、シクラセン骨格の平面伸長構造であるブ ロモヘキサセン前駆体の合成に初めて成功した。しかしながら、本手法では小さな環サイズを有する前駆体を合 成することは難しかったので、ノルボルナジエン-2,3,5,6-テトラジエン体による反応を試みたが、対応するシ クラセン前駆体は合成できなかった。今後は多段階反応によるシクラセン骨格の合成を検討することが課題とな った。

  • 有機鉄錯体を助触媒とした貴金属フリー光触媒系の開発

    研究課題/領域番号:17H04888  2017年 - 2019年

    科学研究費助成事業  若手研究(A)

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    担当区分:研究代表者  資金種別:科研費

  • 基盤研究C「グラフェンナノリボンの原子配列構造を活用した電子デバイス」

    2016年4月 - 2017年3月

    東北大学, 原子分子材料科学高等研究機構 

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    担当区分:研究分担者 

    The aim of this proposal is to advance graphene nanoribbon (GNR) fabrication by self-assembly for the purpose of transport-devices fabrication that can elucidate the unique effects of the exact graphene atomic structures on its electromagnetic properties. We have obtained both theoretical and experimental results that are pertinent towards the goal of fabricating the first precise zigzag-edge GNR device, with properties directly accessible from the macroscopic scale. Both these results address the effects of chemical functional groups of the precursor molecules on the length of the final GNR product after self-assembly. We have developed a new mathematical equivalence sampling method to model the assembly of precursor molecules with arbitrary functional groups, to predict the final morphology of the GNR products. We have also used experiments to test the effects of select functional groups on the precursor molecules to determine the actual effects of these functional groups on the morphology of the final GNR products. From these two sets of results, we have elucidated the mechanism of GNR fabrication by self-assembly using select precursor molecules. These results directly contribute to the ultimate goal of this project.

  • グラフェンナノリボンの原子配列構造を活用した電子デバイス

    研究課題/領域番号:16K04897  2016年 - 2017年

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    担当区分:研究分担者  資金種別:科研費

  • 光応答型有機錯体ー無機ハイブリッド光触媒のための新規有機助触媒の開発

    2015年 - 2016年

    平成28年度 QRプログラム(わかばチャレンジ)

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    担当区分:研究代表者  資金種別:学内資金・基金等

  • 若手研究(B) 「アルコールに可溶な前躯体を利用した有機半導体材料の開発とセンサーへの展開研究 」

    2014年4月 - 2016年3月

    九州大学カーボンニュートラルエネルギー国際研究所 

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    担当区分:研究代表者 

    本研究ではアルコールに可溶な新規有機半導体の前駆体の開発と、これを用いた半導体材料への化学的刺激による変換、並びにこの変換を利用した電荷輸送能の評価と光・化学刺激応答センサーへの展開を行うことを目的とし、アルコール溶解部位の開発と化学刺激により構造変換可能な有機半導体材料の開発を行った。一連の研究により、アルコールに可溶な新規材料としてアルキル鎖修飾ロイコインジゴを見出し、酸素刺激により半導体材料アルキルインジゴへと変換した。この結果を基に得られた新規アルキルインジゴデバイスは酸素-光応答による新規化学センサーへの展開が可能であった。

  • 倉田奨励金「高安定なラジカル性有機半導体材料の開発と有機トランジスタへの応用」

    2014年4月 - 2015年3月

    九州大学カーボンニュートラルエネルギー国際研究所 

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    担当区分:研究代表者 

    アセン骨格を1次元に拡張した「高次アセン」類はラジカル性を有し、高い電荷輸送材料と期待されるが、合成の煩雑さ、取り扱いづらさから、研究をデバイスへ応用させた研究は少ない。我々はこれまでに簡便な高次アセンの合成法の開発を行っており、これまで不可能とされてきた高次アセンの合成と4cm2/Vs以上の電荷移動度を有するデバイス作成を達成してきている。近年、化学的に発生させたアセン類のラジカル種は、中性種に比べ安定性が高まるという報告がある。そこで本研究では単離可能でラジカル性を有すると期待される、「ラジカル性高次アセン」の開発と物性研究を行う。これら化合物の物性を明らかにするとともに、これまでの有機材料のトランジスタ性能を凌駕する材料開発を目指す。

  • アルコールに可溶な前躯体を利用した有機半導体材料の開発とセンサーへの展開研究

    研究課題/領域番号:26810107  2014年 - 2015年

    科学研究費助成事業  若手研究(B)

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    担当区分:研究代表者  資金種別:科研費

  • 高安定なラジカル性有機半導体材料の開発と有機トランジスタへの応用

    2014年 - 2015年

    倉田奨励金

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    担当区分:研究代表者  資金種別:受託研究

  • 研究活動スタート支援 「新規なアンバイポーラ有機半導体材料の開発に関する研究 」

    2013年4月 - 2014年3月

    九州大学カーボンニュートラルエネルギー国際研究所 

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    担当区分:研究代表者 

    本研究ではアンバイポーラ能を有する新規機能性有機色素材料の探索を目的とし、材料の分子設計、開発、並びにその物性研究を目的として行った。研究では、研究者がこれまでに研究を続けてきた、高い正孔輸送能を有する「アセン」骨格に、電子輸送能を有する骨格を組み込むことで新規なアンバイポーラ材料を開発する計画であり、この際、研究の促進を期待して分子計算によるアプローチを行った。理論計算では、材料のエネルギー準位、スペクトルの吸収位置、そして、電荷輸送の際に最も重要なファクターである、分子構造の「再配列エネルギー」を調べることができる。この計算アプローチは本研究を行う九州大学のスーパーコンピュータシステムを利用した。アプローチの結果、数種の骨格導入が、アンバイポーラ能の発現に有用であることが期待された。
    例えばアセン骨格の両末端にフラン環を導入した「ジフラノアセン」誘導体では、環縮合数の増加に伴い、正孔・電子輸送の際の再配列エネルギーが減少し、アンバイポーラ能を発現する事が期待された。この結果を元に、実際に材料を合成し、環縮合数が6つであるジフラノテトラセンおよび7つであるジフラノペンタセンの誘導体を新規に合成した。これら化合物群は、結晶・溶液中で、暗室下において非常に安定であり、材料として有用であることが期待された。さらに、環縮小に伴い吸収スペクトルは長波長側へシフトし、エネルギーギャップが狭まることが示唆された。これは実際にサイクリックボルタンメトリーにより確認でき、アンバイポーラ能を持つ可能性が高いことが実験的にも期待された。

  • 新規なアンバイポーラ有機半導体材料の開発に関する研究

    研究課題/領域番号:25888018  2013年 - 2014年

    日本学術振興会  科学研究費助成事業  研究活動スタート支援

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    担当区分:研究代表者  資金種別:科研費

▼全件表示

教育活動概要

  • 大学院:オートモーティブ環境科学I

担当授業科目

  • オートモーティブ環境科学I

    2023年10月 - 2024年3月   後期

  • オートモーティブ環境科学I

    2022年10月 - 2023年3月   後期

  • オートモーティブ環境科学I

    2020年10月 - 2021年3月   後期

  • オートモーティブサイエンス演習I

    2020年4月 - 2020年9月   前期

  • オートモーティブ環境科学I

    2019年4月 - 2019年9月   前期

  • オートモーティブサイエンス演習I

    2019年4月 - 2019年9月   前期

  • オートモーティブ環境科学I

    2024年10月 - 2025年3月   後期

  • オートモーティブサイエンス演習IV

    2024年10月 - 2025年3月   後期

  • オートモーティブサイエンス演習II

    2024年10月 - 2025年3月   後期

  • Automotive Science Seminar 4

    2024年10月 - 2025年3月   後期

  • Automotive Science Seminar 3

    2024年10月 - 2025年3月   後期

  • Automotive Science Seminar 2

    2024年10月 - 2025年3月   後期

  • Automotive Science Seminar 1

    2024年10月 - 2025年3月   後期

  • オートモーティブサイエンス特別研究A

    2024年4月 - 2025年3月   通年

  • オートモーティブサイエンス特別研究A

    2024年4月 - 2025年3月   通年

  • インターンシップIV

    2024年4月 - 2025年3月   通年

  • インターンシップIII

    2024年4月 - 2025年3月   通年

  • インターンシップII

    2024年4月 - 2025年3月   通年

  • インターンシップI

    2024年4月 - 2025年3月   通年

  • インターンシップ

    2024年4月 - 2025年3月   通年

  • Seminar Advanced Automotive Science3

    2024年4月 - 2025年3月   通年

  • Seminar Advanced Automotive Science2

    2024年4月 - 2025年3月   通年

  • Seminar Advanced Automotive Science1

    2024年4月 - 2025年3月   通年

  • オートモーティブサイエンス演習III

    2024年4月 - 2024年9月   前期

  • オートモーティブサイエンス演習I

    2024年4月 - 2024年9月   前期

  • Automotive Science Seminar 4

    2024年4月 - 2024年9月   前期

  • Automotive Science Seminar 3

    2024年4月 - 2024年9月   前期

  • Automotive Science Seminar 2

    2024年4月 - 2024年9月   前期

  • Automotive Science Seminar 1

    2024年4月 - 2024年9月   前期

▼全件表示

社会貢献活動

  • ワークショップコレクションin福岡2019「光で作る未来のエネルギー」

    主催:NPO法人CANVAS/株式会社グッデイ 共催:九州大学  九州大学伊都キャンパス  2019年3月

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    対象: 社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

メディア報道

  • Motonori Watanabe, "Creation of organic / inorganic composite materials by modifying dye structure and photocatalyst" 新聞・雑誌

    2021年10月

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    Motonori Watanabe, "Creation of organic / inorganic composite materials by modifying dye structure and photocatalyst"

学内運営に関わる各種委員・役職等

  • 2020年4月 - 2022年3月   地区 イーストゾーン安全衛生委員会

  • 2019年4月 - 2020年3月   地区 イーストゾーン安全衛生委員会