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  • Summary & Details

Operando-XAFS analysis of fuel cell electrode catalysts at SPring-8

SPring-8を用いたFC電極触媒の実作動状態XAFS解析

Detailed Information

Author(J)1) 畑中 達也, 2) 廣嶋 一崇, 3) 野中 敬正, 4) 西村 友作, 5) 長井 康貴, 6) 堂前 和彦, 7) 森本 友
Author(E)1) Tatsuya Hatanaka, 2) Kazutaka Hiroshima, 3) Takamasa Nonaka, 4) Yusaku Nishimura, 5) Yasutaka Nagai, 6) Kazuhiko Dohmae, 7) Yu Morimoto
Affiliation(J)1) 豊田中央研究所, 2) 豊田中央研究所, 3) 豊田中央研究所, 4) 豊田中央研究所, 5) 豊田中央研究所, 6) 豊田中央研究所, 7) 豊田中央研究所
Affiliation(E)1) Toyota Central R&D Labs., 2) Toyota Central R&D Labs., 3) Toyota Central R&D Labs., 4) Toyota Central R&D Labs., 5) Toyota Central R&D Labs., 6) Toyota Central R&D Labs., 7) Toyota Central R&D Labs.
Abstract(J)燃料電池用電極触媒として用いられるPt微粒子の化学状態を、電位・ガス雰囲気などの電気化学反応場を制御しながら高速計測が可能な実作動状態XAFS測定によって解析した。同じ電位でも低電位から電位を上げた場合の方が、高電位から電位を下げた場合よりPtは金属的であり、高い活性が発揮されることがわかった。

Translation

Abstract(E)Operando XAFS analysis, in which quick XAFS measurements are carried out for a material under its working environment, was applied for platinum electrocatalysts in a working polymer electrolyte fuel cell with controlling the potential and gas environment. The chemical state of the platinum nano-particle electrocatalysts at a certain potential was found more metallic when the potential was changed from a lower potential rather than from a higher potential. This difference in the chemical state elucidates the difference in the catalytic activity for oxygen reduction reaction.

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