Co oxidation accompanied by degradation of Pt-Co alloy cathode catalysts in polymer electrolyte fuel cells

被引：18

作者：

Kobayashi, Masaki ^{[1
,2
,3
]}

Hidai, Shoichi ^{[1
,4
]}

Niwa, Hideharu ^{[1
]}

Harada, Yoshihisa ^{[1
,2
,3
]}

Oshima, Masaharu ^{[1
,2
]}

Horikawa, Yuka ^{[3
]}

Tokushima, Takashi ^{[3
]}

Shin, Shik ^{[3
,5
]}

Nakamori, Yoji ^{[4
]}

Aoki, Tsutomu ^{[4
]}

机构：

[1] Univ Tokyo, Dept Appl Chem, Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan

[2] Univ Tokyo, Synchrotron Radiat Res Org, Sayo, Hyogo 6795165, Japan

[3] RIKEN SPring 8, Sayo, Hyogo 6795148, Japan

[4] Toshiba Fuel Cell Power Syst Corp, Kawasaki, Kanagawa 2100862, Japan

[5] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2009年 / 11卷 / 37期

关键词：

DURABILITY ENHANCEMENT; MEMBRANE DEGRADATION; OXYGEN REDUCTION; CARBON SUPPORT; PEMFC; ELECTROCATALYSIS; ELECTROREDUCTION; PERFORMANCE; BEHAVIOR; XPS;

D O I：

10.1039/b903818c

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electronic structure of Co ions in Pt3Co alloy cathode catalysts for polymer electrolyte fuel cells (PEFCs) under different operation conditions has been investigated using X-ray absorption spectroscopy (XAS). The line shapes of the Co 2p XAS spectra indicate that the Co atoms in the cathode layer are predominantly metallic in all cells, and the spectrum of the first-operated cell is the most metallic among them. The Co 2p XAS spectra slightly change depending on the operation conditions, and the differences in the spectra can be explained by the presence of cobalt oxides. Decomposition analysis of the Co 2p XAS spectra reveals that the operation of Pt-Co PEFCs yields trivalently oxidised cobalt in the cathode layer.

引用

页码：8226 / 8230

页数：5

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