In situ measurement of active catalyst surface area in fuel cell stacks
In situ measurement of active catalyst surface area in fuel cell stacks
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DOI：
10.1016/j.jpowsour.2013.05.046
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发表时间：
2013-11-15
影响因子：
9.2
通讯作者：
O'Malley, R.
中科院分区：
文献类型：
--
作者：
Brightman, E.;Hinds, G.;O'Malley, R.
测量燃料电池电极的电化学比表面积(ECSA)是一项关键的性能诊断，为监测聚合物电解质膜燃料电池(PEMFCs)的降解和健康状态提供了有用的参数。然而，确定ECSA的传统方法需要对电池进行恒电位控制，这在燃料电池组中是不切实际的。在这里，我们首次演示了恒流技术的实际应用，该技术能够在电堆的整个生命周期内对每个电池中的ECSA进行现场监测。这一概念是在单电池水平上证明的，使用H吸附和CO剥离，并将H吸附(阴极电流)方法扩展到电堆测试。通过适当选择电流密度并在阳极上使用稀H-2，可以最大限度地减少H-2交叉对测量的不良影响。在一系列MEA设计中，使用传统的单电池伏安法测定的ECSA值获得了良好的一致性。该技术易于实现，并为PEMFC电堆寿命研究期间的健康状态监测提供了宝贵的工具。皇冠版权所有(C)2013由爱思唯尔B.V.出版。保留所有权利。
Measurement of electrochemical surface area (ECSA) of fuel cell electrodes is a key diagnostic of performance and gives a useful parameter for monitoring degradation and state of health in polymer electrolyte membrane fuel cells (PEMFCs). However, conventional methods for determining ECSA require potentiostatic control of the cell, which is impractical in a fuel cell stack. Here we demonstrate for the first time the practical application of a galvanostatic technique that enables in situ monitoring of ECSA in each cell throughout the lifetime of a stack. The concept is demonstrated at single cell level using both H adsorption and CO stripping, and the H adsorption (cathodic current) method is extended to stack testing. The undesirable effects of H-2 crossover on the measurement may be minimised by appropriate selection of current density and by working with dilute H-2 on the anode electrode. Good agreement is achieved with ECSA values determined using conventional single cell voltammetry across a range of MEA designs. The technique is straightforward to implement and provides an invaluable tool for state of health monitoring during PEMFC stack lifetime studies. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.