Effect of oxide film on oxygen reduction current for the platinum-cobalt alloy electrodes in PEFC

被引：6

作者：

Tamura, Yuichi ^{[1
]}

Taneda, Kento ^{[1
]}

Ueda, Mikito ^{[1
]}

Ohtsuka, Toshiaki ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan

来源：

CORROSION SCIENCE | 2009年 / 51卷 / 07期

关键词：

Pt-Co alloy; Raman spectroscopy; Ellipsometry; Oxide film; PEFC cathode; DENSITY-FUNCTIONAL THEORY; METHANOL FUEL-CELLS; ELECTROCATALYSTS; CATALYSTS; CO; NI; STABILITY; TEMPERATURE; ADSORPTION; OXIDATION;

D O I：

10.1016/j.corsci.2008.10.030

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Effect of surface oxide on Pt-Co alloy electrodes on the oxygen reduction reaction (ORR) was investigated in 0.5 M sulfuric acid Solution by electrochemistry, ellipsometry. laser Raman scattering spectroscopy, and XPS. The oxide as thick as 1-2 nm increases the overpotential of ORR and falls down efficiency of PEFC. The thickness of the oxide films is precisely determined by ellipsometry. The oxide film 1.9 nm thick was formed on Pt-50 mol% Co electrode by constant potential oxidation at 1.20 V and the film 1.5 nm thick remains on the electrode at 0.6 V at which ORR already starts. The remaining oxide decreases the current density of ORR and increases the overpotential. On pure Pt electrode, the similar influence of the oxide filrn was observed. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1560 / 1564

页数：5

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