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• 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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• Catalytic activity of zirconia on zirconium for the oxygen evolution reaction in potassium hydroxide

  K. Matsuzawa, A. Ishihara, A. Oishi, S. Mitsushima, K. Ota

  Materials Science and Engineering: B ( Elsevier )  267   115112   2021年03月  [査読有り]

  共著

  　概要を見る

  It has been reported that the Ni anode electrode used in alkaline water electrolysis (AWE) is degraded when the fluctuating electricity produced by renewable energy (wind and solar power) systems is used. To develop alternative materials, we focused on zirconium oxide because of its high chemical stability, and investigated its catalytic activity for the oxygen evolution reaction (OER) on zirconium oxides on a zirconium plate fabricated by both air oxidation (ZrO2/Zr) and arc-plasma deposition (ZrO2/Zr_APD). From cross-sectional observations and electrochemical results, the mixed tetragonal and monoclinic structure of ZrO2 was related to its catalytic activity for the OER. ZrO2/Zr_APD showed obviously a higher activity than ZrO2/Zr. The reason for this is that the particles are better dispersed in ZrO2/Zr_APD than in ZrO2/Zr, so the electrochemical surface area of ZrO2/ Zr_APD seems to be larger than that of ZrO2/Zr.

  DOI

• Control of surface area and conductivity of niobium-added titanium oxides as durable supports for cathode of polymer electrolyte fuel cells

  Y.-B. Ma, T. Nagai, Y. Inoue, K. Ikegami, Y. Kuroda, K. Matsuzawa, Teko W. Napporn, Y. Liu, S. Mits … 全著者表示

  Materials and Design ( Elsevier )  203   109623   2021年03月  [査読有り]

  共著

  　概要を見る

  Niobium-added titanium oxide is a promising candidate as a substitute carbon support for cathodes of PEFCs. Nb-added TiO2 can act as a support for platinum nanoparticles to enhance the oxygen reduction reaction (ORR) ac-tivity and durability under acidic conditions. Nb-added TiO2 supports with the desired surface area (10–130 m2 g−1) and conductivity (10−7–10−2 Scm−1) were prepared by changing the amount of Nb and the heat treatment conditions. First, we conducted a systematic investigation with changes in the amount of niobium addition, heat-treatment temperature, and time under a pure hydrogen atmosphere to reveal the physicochem-ical factors that govern the surface area and conductivity. Finally, we successfully proposed a procedure to pre-pare highly durable Nb-added TiO2 supports with the desired surface area and conductivity by controlling the amount of niobium addition, heat-treatment temperature, and time under hydrogen. The charges of the double layer were almost unchanged after 5000 cycles of an accelerated durability test (ADT).

  DOI

• 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

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総説・解説記事 【 表示 ／ 非表示 】

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• 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 】

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• 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 】

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• 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。