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)

関連SDGs




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

  • Effect of Semiconducting Properties of Oxide-Based Compounds on Oxygen Reduction Activity in Acidic Media

    A. Ishihara, J. Hirata, T. Nagai, Y. Kuroda, K. Matsuzawa, A. Imanishi, S. Mitsushima, Y. Takasu, a … 全著者表示

    ECS Transaction ( The Electrochemical Society )  98 ( 9 ) 457 - 464   2020年10月  [査読有り]

    単著

     概要を見る

    Effect of semiconducting properties of group 4 and 5 oxide-based films on catalytic activity of oxygen reduction reaction (ORR) has been investigated. In case of n-type semiconductor oxide catalysts, there are two reasons that the ORR activities are apparently observed to be low; one is that there are few active sites with high quality on the surface, another is that although the relative active sites are exists on the surface the Schottky barrier formed in the space charge layer of the oxides suppresses the electron transfer from bulk to the surface. The positive correlation between flat-band potential and onset potential for the ORR of thick oxide films composed of titanium-niobium, -tantalum, and -zirconium oxides was observed, indicating that the ORR activities were governed by the semiconducting properties of the films.

    DOI

  • P-Doped SnO2 Powder as a Support for PEFC Cathode

    Y. Inoue, K. Matsuzawa, Y. Ma, Y. Ohgi, T. Nagai, Y. Kuroda, S. Yamamoto, and A. Ishihara

    ECS Transaction ( The Electrochemical Society )  98 ( 9 ) 565 - 572   2020年10月  [査読有り]

    共著

     概要を見る

    A possibility of commercial P-doped SnO2 was evaluated as a non-carbon support for PEFC cathodes. The effect of heat-treatment under various conditions on the physical properties of the P-doped SnO2 was investigated. The P-doped SnO2 was sensitive by the heat-treatment in reductive atmosphere, 4%H2/Ar. The surface area was hardly affected by the heat-treatment in air or Ar even at high temperature such as 900 °C. On the other hand, the conductivity was dramatically affected by the atmosphere during the heat-treatment. The heat-treatment in Ar at higher temperature rather increased in the conductivity, whereas the heat-treatment in air caused the drastic decrease in the conductivity. This difference might be responsible for the formation and extinction of the oxygen vacancies.

    DOI

  • Factors Affecting ORR Activity of Nb-Added TiOx Catalyst Using Carbon Support for PEFC

    Y. Adachi, T. Nagai, Y. Ohgi, Y. Kuroda, K. Matsuzawa, S. Mitsushima, K. Ota, and A. Ishihara

    ECS Transaction ( The Electrochemical Society )  98 ( 9 ) 555 - 563   2020年10月  [査読有り]

    共著

     概要を見る

    Cup-stacked carbon nanotubes (CSCNTs) were covered with niobium-added titanium oxide by hydrolysis method to increase effective surface area of the oxides. In addition, reductive heat-treatment was performed to produce the active sites for the oxygen reduction reaction (ORR). The use of CSCNTs as supports was found to be effective to form the electron conductive path. The ORR currents of the Nb-added titanium oxide supported by CSCNTs significantly larger than those of Nb-added titanium oxide powder mixed with Ketjenblack. On the other hand, the ORR current at 0.6 V had maximum at the heat-treatment temperature of 800 °C. We focused on the ratio of Ti3+ of the catalysts and found that the positive correlation between the ratio of Ti3+ and the ORR current density at 0.6 V. Therefore, it was found that the formation of the oxygen vacancies on the oxide surface strongly affected the ORR activity.

    DOI

  • Effect of Added Elements into TiO2 on Oxygen Reduction Activity in Acid Media

    A. Ishihara, T. Nagai, M. Matsumoto, M. Arao, Y. Kuroda, K. Matsuzawa, H. Imai, S. Mitsushima, K. O … 全著者表示

    ECS Transaction   97 ( 7 ) 583 - 592   2020年08月  [査読有り]

    共著

    DOI

  • 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 … 全著者表示

    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

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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。