石原 顕光 (イシハラ アキミツ)

ISHIHARA Akimitsu

所属組織

先端科学高等研究院

職名

特任教員(教授)



ORCID  https://orcid.org/0000-0002-7515-7374

取得学位 【 表示 / 非表示

  • 博士(工学) -  横浜国立大学

学内所属歴 【 表示 / 非表示

  • 2015年01月
    -
    継続中

    専任   横浜国立大学   先端科学高等研究院   特任教員(教授)  

所属学会 【 表示 / 非表示

  • 2014年
    -
    継続中
     

    触媒学会

  • 2008年
    -
    継続中
     

    米国電気化学会

  • 2000年
    -
    継続中
     

    水素エネルギー協会

  • 1999年
    -
    継続中
     

    日本化学会

  • 1987年
    -
    継続中
     

    電気化学会

 

著書 【 表示 / 非表示

  • トコトンやさしいエントロピーの本第2版

    石原顕光 (担当: 単著 )

    日刊工業新聞社  2020年02月 ISBN: 4526080438

  • しっかり学ぶ 化学熱力学: エントロピーはなぜ増えるのか

    石原顕光 (担当: 単著 )

    裳華房  2019年05月 ISBN: 4785335165

  • 水素エネルギーの事典

    水素エネルギー協会 (担当: 共編者 , 担当範囲: 第5章編集担当 )

    朝倉書店  2019年03月 ISBN: 4254141068

  • おもしろサイエンス熱と温度の科学

    石原顕光 (担当: 単著 )

    日刊工業新聞社  2019年01月 ISBN: 4526079251

    Amazon

  • Nanocarbons for Energy Conversion: Supramolecular Approaches (Nanostructure Science and Technology)

    Yuta Nabae and Akimitsu Ishihara (担当: 共著 )

    Springer   2019年 ISBN: 3319929151

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論文 【 表示 / 非表示

  • Challenge of advanced low temperature fuel cells based on high degree of freedom of group 4 and 5 metal oxides

    Akimitsu Ishihara, Satoshi Tominaka, Shigenori Mitsushima, Hideto Imai4 Osamu Sugino and Ken-ichiro Ota

    Current Opinion in Electrochemistry ( Elsevier )  21   234 - 241   2020年03月  [査読有り]  [招待有り]

    共著

     概要を見る

    To obtain an ideal electrocatalysts for hydrogen fuel cells, we investigated group 4 and 5 oxide-based compounds because of their high degree of freedom. First-principles calculations revealed that oxide surfaces such as those of titanium oxide could break down the universal scaling to achieve the ideal state of the oxygen reduction reaction. We experimentally clarified that the active sites were oxygen vacancies for tantalum and zirconium oxides, in addition to doped foreign elements and crystalline structures for titanium oxide. We successfully demonstrated that precious metal-free and carbon-free oxide-based cathodes have high quality active sites and superior durability in 0.1 M sulfuric acid at 80oC. Our strategy was developed as follows: (1) Active sites are created on the oxide surface by modifying the crystalline structure and electronic states and (2) electrons participating in the oxygen reduction reaction are supplied by nanosized oxide particles and oxide films through the tunneling effect of electrons.

    DOI

  • Carbon Nanotube-Based Non-Precious Metal Electrode Catalysts for Fuel Cells, Water Splitting and Zinc-Air Batteries

    Yang Jun, Ganesan Pandian, Ishihara Akimitsu, Nakashima Naotoshi

    ChemCatChem ( Wiley-VCH )  11   5929 - 5944   2019年12月  [査読有り]  [招待有り]

    共著

    Web of Science DOI

  • Indium oxide supported Pt–In alloy nanocluster catalysts with enhanced catalytic performance toward oxygen reduction reaction

    Yunlv Cheng, Xinshu Zhao, Yulv Yu, Lifang Chen, Tao Cheng, Jin Huang, Yan Liu, Masafumi, Harada, Akimitsu Ishihara, YuanWang

    Journal of Power Sources ( Elsevier )  ( 446 ) 227332   2019年11月  [査読有り]

    共著

     概要を見る

    Few currently applied carbon-supported metal cathode catalysts exhibit satisfactory durability under the harsh operation conditions of proton exchange membrane fuel cells. Herein we report for the first time a highly active In2O3 supported Pt–In alloy nanocluster (NC) catalyst (Pt–In/In2O3) toward oxygen reduction reaction, with small alloy NCs and a Pt content of 42 wt%, which exhibits obviously enhanced durability compared to currently applied carbon-supported Pt catalysts (Pt/C) and previously reported Pt NCs-based catalysts with a similar Pt content. The mass activity (MA) and specific activity (SA) over Pt–In/In2O3 are 0.32 A·mg−1Pt and 1.14 mA cm−2 at 0.9 V (vs. reversible hydrogen electrode (RHE)), respectively. Electron transfer from In to Pt in the alloy NCs occurs as confirmed by X-ray absorption measurements, which is an important cause of the high catalytic activity. After an accelerated aging test of 6000 potential cycles between 1.0 and 1.6 V, the MA loss over Pt–In/In2O3 is 3%, but that over Pt/C is 33%. The catalysts subjected to the aging test are characterized by transmission electron microscopy and X-ray diffraction to understand the extremely high durability.

    DOI

  • Titanium Oxide Nano-Particles as Supports of Cathode Catalysts for Polymer Electrolyte Fuel Cells

    Y.-B. Ma, Y.-L. Cheng, Y. Inoue, T. Nagai, Y. Kuroda, K. Matsuzawa, S. Mitsushima, Y. Lib, Y. Wang and A. Ishihara

    ECS Transaction ( The Electrochemical Society )  8 ( 92 ) 485 - 491   2019年10月  [査読有り]

    共著

     概要を見る

    Because of low durability of carbon support which is widely used as a matrix of cathode catalyst in polymer electrolyte fuel cells (PEFCs), a novel carbon-free support with high durability is needed. The conductive oxide is one of the promising candidates due to its high durability. Titanium oxide nano-particles were already applied to an alternative material of carbon, with they have high chemical stability in the acid electrolyte and high electronic conductivity. In this study, we prepared a Nb-doped TiO2 by hydrothermal method and it was reduced in a pure hydrogen atmosphere to obtain Nb-TiOx support. Comparing with a commercial Pt/C catalyst, the Pt/Nb-TiOx catalyst behaved higher durability after 5000 cycles of start-stop accelerated durability test.

    DOI

  • Effect of Nitrogen Doping on Oxygen Reduction Activity of TiO2 in Acidic Media

    A. Ishihara, T. Nagai, N. Murase, M. Arao, Y. Kuroda, K. Matsuzawa, S. Mitsushima, K. Furukawa, H. Imai K. Lee and K. Ota

    ECS Transaction ( The Electrochemical Society )  8 ( 92 ) 613 - 620   2019年10月  [査読有り]

    共著

     概要を見る

    In order to investigate the effect of the nitridation of TiO2 on the ORR activity, TiO2 powders with three different kinds of crystalline structure (rutile, anatase, and brookite) were heat- treated under NH3 containing gas atmosphere to dope the nitrogen. We found that the increase in the ORR activity by nitrogen doping depended on the crystalline structure of TiO2 and the apparent relationship was observed for rutile type TiO2. We found that the increase in the ORR activity of the rutile TiO2 with nitrogen content of 0.7wt% was responsible for the production of the oxygen vacancies in the rutile TiO2 as active sites and the formation of the electron supply path by formation of the electronic conductive Ti4O7 on the surface by nitridation.

    DOI

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総説・解説記事 【 表示 / 非表示

  • 基礎講座第2回 電極電位及び電池電圧と反応の駆動力

    石原顕光

    燃料電池 ( 燃料電池開発情報センター )  19 ( 3 ) 61 - 72   2020年02月  [依頼有り]

    総説・解説(学術雑誌)   単著

  • 酸化物系酸素還元触媒

    石原顕光・太田健一郎

    工業材料 ( 日刊工業新聞社 )  67 ( 7 ) 42 - 45   2019年06月  [依頼有り]

    総説・解説(商業誌)   共著

     概要を見る

    著者らが世界に先駆けて開発してきた酸化物系酸素還元触媒の開発状況と可能性について述べた。

  • 基礎講座第1回 電気化学システムとしての燃料電池の理論効率-熱力学からみた燃料電池-

    石原顕光

    燃料電池 ( 燃料電池開発情報センター )  19 ( 2 ) 24 - 31   2019年  [依頼有り]

    総説・解説(学術雑誌)   単著

  • 酸素還元電極触媒の脱貴金属への挑戦

    石原顕光・太田健一郎

    触媒 ( 触媒学会 )  38 ( 12 ) 302 - 307   2018年  [査読有り]  [依頼有り]

    総説・解説(大学・研究所紀要)   共著

  • 横浜国立大学グリーン水素研究センターの活動紹介と社会貢献

    太田健一郎・石原顕光・永井崇昭

    JETI   66 ( 1 ) 121 - 125   2017年  [依頼有り]

    総説・解説(大学・研究所紀要)   共著

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研究発表 【 表示 / 非表示

  • Challenges of PGM- and Carbon-Free Cathodes Based on Group 4 and 5 Metal Oxides for Future Advanced PEFCs

    Akimitsu Ishihara  [招待有り]

    The 10th Asian Conference on Electrochemical Power Sources  2019年10月24日  

  • Effect of Nitrogen Doping on Oxygen Reduction Activity of TiO2 in Acidic Media

    Akimitsu Ishihara  [招待有り]

    236th Meeting of Electrochemical Society  2019年10月17日  

  • Emergence of Oxygen Reduction Activity of Group 4 and 5 Oxide-Based Cathodes for Polymer Electrolyte Fuel Cells

    Akimitsu Ishihara  [招待有り]

    Electrolysis and Fuel Cell Discussions 2019 – Towards Catalysts free of Critical Raw Materials  2019年09月15日   EFCD 2019 Conference

  • OXYGEN REDUCTION ACTIVITY OF GROUP 4 AND 5 OXIDE-BASED COMPOUNDS AS NON-PLATINUM CATHODE FOR PEFCS

    Akimitsu Ishihara  [招待有り]

    International Fuel Cell Workshop 2018  2018年08月24日  

  • Development of Group 4 and 5 Oxide-Based Cathodes for PEFCs

    Akimitsu Ishihara  [招待有り]

    68th Annual Meeting of International Society of Electrochemistry  2017年08月31日  

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社会活動(公開講座等) 【 表示 / 非表示

  • 公開講座講師

    横浜国立大学工学部 

    2007年06月
     
     

     概要を見る

    「エネルギー・環境問題と水素・燃料電池技術の現状」にて非貴金属系の固体高分子形燃料電池用電極触媒の研究に関して講演。