An electrochemical impedance spectroscopy study of fuel cell electrodes

被引:102
作者
Easton, EB [1 ]
Pickup, PG [1 ]
机构
[1] Mem Univ Newfoundland, Dept Chem, St John, NF A1B 3X7, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
fuel cell; electrochemical impedance spectroscopy; ion transport;
D O I
10.1016/j.electacta.2004.10.074
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Electrochemical impedance spectroscopy (EIS) was used to study the capacitance and ion transport properties of fuel cell catalyst layers. It was found that limiting capacitance correlates with active area. The capacitance per gram of catalyst was calculated and is proposed as a measure of catalyst utilization. Results obtained with catalyst layers immobilized on glassy carbon electrodes agree very well with results obtained with gas diffusion electrodes. EIS was also used to study ion conductivity and active area in fuel cell electrodes that contain the electroactive probe Os(bpy)(3)(2+). Together, these results validate the hypothesis that the non-ideal behavior of fuel cell electrodes is due to variations of conductivity across the layer, rather than variations in capacitance. (c) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2469 / 2474
页数:6
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