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1. (WO2018124193) OXYGEN REDUCTION CATALYST, MEMBRANE ELECTRODE ASSEMBLY, AND FUEL CELL

Pub. No.:    WO/2018/124193    International Application No.:    PCT/JP2017/046946
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Thu Dec 28 00:59:59 CET 2017
IPC: B01J 27/049
B01J 27/051
H01M 4/90
H01M 8/10
Applicants: SHOWA DENKO K.K.
昭和電工株式会社
Inventors: IMAI Takuya
今井 卓也
FURUYA Kazuo
古谷 和男
LEE Kunchan
李 建燦
SAKAGUCHI Suguru
坂口 俊
OKUNO Yoshishige
奥野 好成
Title: OXYGEN REDUCTION CATALYST, MEMBRANE ELECTRODE ASSEMBLY, AND FUEL CELL
Abstract:
The present invention is an oxygen reduction catalyst containing, as constituent elements, cobalt, sulfur, and a transition metal element M that is at least one element selected from a group consisting of chromium and molybdenum, the presence of the cubic crystal structure of the cobalt disulfide being confirmed in a powder X-ray diffraction measurement, and the molar ratio between the transition metal element M and the cobalt (M/cobalt) being 5/95 to 15/85. This oxygen reduction catalyst is highly active, highly durable, and can be a substitute for platinum. Specifically, this oxygen reduction catalyst has high durability in a PEFC operating environment and can achieve: suppression of the Co elution rate in an acidic atmosphere; and a high retention rate of an oxygen reduction potential before and after an acid immersion test.