The corrosion of PEM fuel cell catalyst supports and its implications for developing durable catalysts

被引：104

作者：

Shao, Yuyan ^{[1
]}

Wang, Jun ^{[1
]}

Kou, Rong ^{[1
]}

Engelhard, Mark ^{[1
]}

Liu, Jun ^{[1
]}

Wang, Yong ^{[1
]}

Lin, Yuehe ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

来源：

ELECTROCHIMICA ACTA | 2009年 / 54卷 / 11期

关键词：

PEM fuel cell; Catalyst support; Degradation/corrosion; Potential-step; Accelerated durability test; ORIENTED PYROLYTIC-GRAPHITE; OXIDIZED CARBON-FIBERS; SULFURIC-ACID-SOLUTION; OXYGEN REDUCTION; ELECTROCHEMICAL OXIDATION; DEGRADATION; MEMBRANE; DURABILITY; ELECTROCATALYSTS; ELECTRODES;

D O I：

10.1016/j.electacta.2008.12.001

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Studying the corrosion behavior of catalyst support materials is significant for understanding the degradation of polymer electrolyte membrane (PEM) fuel cell performance and developing durable electrocatalysts. The oxidation of Vulcan carbon black (the most widely used catalyst support for PEM fuel cells) was investigated using various electrochemical stressing methods (fixed-potential holding vs. potential-step cycling). among which the potential-step cycling was considered to mimic more closely the real drive-cycle operation of vehicle PEM fuel cells. The oxidation of carbon was accelerated under potential-step conditions as compared with the fixed-potential holding condition. Increasing the potential-step frequency or decreasing the lower potential limit in the potential-step can further accelerate the corrosion of carbon. The accelerated corrosion of carbon black was tentatively attributed to the cycle of consumption/regeneration of some easily oxidized species. These findings are being employed to develop a test protocol for fast-screening durable catalyst support. (C) 2009 Published by Elsevier Ltd.

引用

页码：3109 / 3114

页数：6

共 54 条

[11] Mechanism for electrochemical oxidation of highly oriented pyrolytic graphite in sulfuric acid solution [J].