Assessment of CO-tolerance for different Pt-alloy anode catalysts in a polymer electrolyte fuel cell using ac impedance spectroscopy

被引:40
作者
Leng, YJ [1 ]
Wang, X [1 ]
Hsing, IM [1 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Chem Engn, Kowloon, Hong Kong, Peoples R China
关键词
electrocatalysis; Ac impedance; fuel cell; anodic oxidation; cyclic voltammetry;
D O I
10.1016/S0022-0728(02)00916-6
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Assessment of CO-tolerance for different anode catalysts (Pt/C, PtRu/C and PtSn/C) at 50 degreesC and PtRu/C at different operating temperatures ill the polymer electrolyte fuel cell (PEFC) was evaluated using ac impedance spectroscopy. Impedance measurements for the oxidation of a H-2 + 2% CO mixture reported that at a critical potential (referred to as the onset potential), 'pseudo-inductive' behavior appears, the value of which is different for different anode catalysts (0.70, 0.45 and 0.30 V for Pt/C, PtRu/C and PtSn/C at 50 degreesC, respectively) and strongly dependent upon working temperatures (0.50, 0.45 and 0.40 V for PtRu/C at 25, 50 and 70 degreesC, respectively). Based on that, we proposed that this onset potential for the 'pseudo-inductive' behavior can be used as a new criterion for the evaluation of CO-tolerance for different anode catalysts at different operating temperatures. (C) 2002 Published by Elsevier Science B.V.
引用
收藏
页码:145 / 152
页数:8
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