Exploring single electrode reactions in polymer electrolyte fuel cells

被引：29

作者：

Kuhn, H. ^{[1
]}

Wokaun, A. ^{[1
]}

Scherer, G. G. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Electrochem Lab, CH-5232 Villigen, Switzerland

来源：

ELECTROCHIMICA ACTA | 2007年 / 52卷 / 06期

关键词：

polymer electrolyte fuel cells; pseudo-reference electrode; electrochemical impedance spectroscopy; kinetic model; oxygen reduction reaction; hydrogen oxidation reaction;

D O I：

10.1016/j.electacta.2006.03.108

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Utilising a pseudo-reference electrode in polymer electrolyte fuel cells allows for the separation of anodic and cathodic contributions to the entire cell impedance. Modelling the impedance responses by using equivalent circuits inhibits the investigation of kinetic parameters of the basic electrochemical reactions, which take place at single electrode-electrolyte inter-faces. Therefore, we evaluate single electrode impedance measurements by a kinetic model, which is based on specific reaction pathways, either for the oxygen reduction reaction (ORR) or the hydrogen oxidation reaction (HOR). As a consequence, it is possible to obtain kinetic parameters for the specific reaction of interest. Furthermore, the information gained from the single electrode impedance measurements and the kinetic model can give insight into single reactions steps. In particular, the ORR has to include a chemical step in the reaction pathway. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：2322 / 2327

页数：6

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