Investigation of hydrogen superoxide adsorption during ORR on Pt/C catalyst in acidic solution for PEFC by high energy resolution XAFS

高分解能XAFS法による酸性溶液下での酸素還元反応中におけるPt/C電極触媒の分子状酸素吸着種の決定

山本 直生*; 松村 大樹   ; 萩原 悠人*; 田中 啓偉*; 長谷川 優太*; 石井 賢司*; 田中 裕久*

Yamamoto, Naoki*; Matsumura, Daiju; Hagihara, Yuto*; Tanaka, Kei*; Hasegawa, Yuta*; Ishii, Kenji*; Tanaka, Hirohisa*

Oxygen Reduction Reaction (ORR) is one of the key electrochemical reactions, especially in Polymer Electrolyte Fuel Cells (PEFCs). In this work, the reaction pathway and intermediate species such as molecular-type oxygen during ORR were discussed. High energy resolution X-ray absorption fine structure spectra at the Pt L-edge were obtained to observe the electronic structure of Pt catalyst. Carbon-supported Pt nanoparticles as powder catalysts were used for measurement as more realistic conditions, and the species adsorbed on the Pt nanoparticles were analyzed while controlling under the potentials in acidic electrolyte solution with N or O gas bubbling. Molecular-type oxygen adsorption species is observed only in the O-bubbled electrolyte solution. This intermediate adsorption species is assigned to a hydrogen superoxide.