Analysis of performance losses in polymer electrolyte fuel cells at high current densities by impedance spectroscopy

被引：115

作者：

Andreaus, B ^{[1
]}

McEvoy, AJ

Scherer, GG

机构：

[1] Ecole Polytech Fed Lausanne, Lab Photon & Interfaces, CH-1015 Lausanne, Switzerland

[2] Paul Scherrer Inst, Electrochem Lab, Res Dept Gen Energy, CH-5232 Villigen, Switzerland

来源：

ELECTROCHIMICA ACTA | 2002年 / 47卷 / 13-14期

关键词：

polymer electrolyte fuel cells; impedance spectroscopy; water management;

D O I：

10.1016/S0013-4686(02)00059-2

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 [应用化学];

摘要：

The physico-chemical origins of the performance loss in polymer electrolyte fuel cells operated at high current densities are investigated. This effect could be attributed to a shortage of water in the proton conducting membrane leading to an increase of the membrane proton-conduction resistance as well as to a increase of the activation overpotential for the hydrogen oxidation reaction due to a decrease in the number of active sites on the anode side. To fortify this thesis, we present measurements of the fuel cell impedance, varying the membrane thickness, the ionic density, and the humidification conditions of the reactants. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：2223 / 2229

页数：7

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