A study of the effect of water management and electrode flooding on the dimensional change of polymer electrolyte fuel cells
A study of the effect of water management and electrode flooding on the dimensional change of polymer electrolyte fuel cells
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DOI：
10.1016/j.jpowsour.2013.05.045
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发表时间：
2013-11-15
影响因子：
9.2
通讯作者：
Brett, Daniel J. L.
中科院分区：
文献类型：
--
作者：
Mason, Thomas J.;Millichamp, Jason;Brett, Daniel J. L.
水管理和溢流对聚合物电解质燃料电池（PEFC）的性能和耐久性起着重要作用。在这项研究中，进行动态机电分析，以检查性能的工作PEFC在水合瞬变和洪水事件。使用电化学阻抗谱（EIS）测量电池电阻，并使用受控压缩单元（CCU）研究电池压缩和膜电极组件（MEA）尺寸变化的应力/应变特性。膜厚度作为水合水平的函数的非原位测量提供了离子电导率和厚度之间的直接相关性。在初始水合的Nafion膜有膜电导率和MEA的尺寸变化（溶胀）之间的直接关系。发现电极淹没导致膜水合和应力或应变的增加，这取决于燃料电池的压缩模式。结果表明，水化周期和洪水事件可能会导致细胞降解，由于所施加的压力。(C)2013 Elsevier B. V.保留所有权利。
Water management and flooding play an important role in the performance and durability of polymer electrolyte fuel cells (PEFCs). In this study, a dynamic electro-mechanical analysis is performed to examine the performance of a working PEFC during hydration transients and flooding events. Cell resistance is measured using electrochemical impedance spectroscopy (EIS), and the stress/strain characteristics cell compression and membrane electrode assembly (MEA) dimensional change - are studied using a controlled compression unit (CCU).Ex-situ measurements of membrane thickness as a function of hydration level provide a direct correlation between ionic conductivity and thickness. During initial hydration of Nafion membranes there is a direct relationship between membrane conductivity and dimensional change (swelling) of MEAs. Electrode flooding is found to result in membrane hydration and an increase in stress or strain, depending on the compression mode of the fuel cell. Results suggest that hydration cycles and flooding events can lead to cell degradation due to the stresses imposed. (C) 2013 Elsevier B.V. All rights reserved.