Extent of PEMFC cathode surface oxidation by oxygen and water measured by CV

被引：73

作者：

Paik, CH ^{[1
]}

Jarvi, TD

O'Grady, WE

机构：

[1] UTC Fuel Cells, S Windsor, CT 06074 USA

[2] USN, Res Lab, Washington, DC 20375 USA

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2004年 / 7卷 / 04期

关键词：

D O I：

10.1149/1.1649698

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The influence of gas-phase oxygen on platinum surface oxidation in polymer electrolyte membrane fuel cell (PEMFC) cathodes was investigated. Catalyst layers were exposed to 4, 21, and 100% O-2 for a fixed time at +0.85 and +0.95 V-RHE. The extent of surface oxidation was characterized using cyclic voltammetry (CV). The extent of Pt surface oxidation increased relative to the corresponding O-2-free potential hold at +0.85 V-RHE. The extent of oxidation was directly proportional to oxygen concentration, and increased with time exposed to the oxygen-containing gas. Pt surface oxidation was not influenced by gas-phase O-2 concentration at +0.95 V-RHE. (C) 2004 The Electrochemical Society.

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页码：A82 / A84

页数：3

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