Membrane degradation in PEM water electrolyzer: Numerical modeling and experimental evidence of the influence of temperature and current density
Membrane degradation in PEM water electrolyzer: Numerical modeling and experimental evidence of the influence of temperature and current density
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DOI：
10.1016/j.ijhydene.2014.11.111
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发表时间：
2015-01-21
影响因子：
7.2
通讯作者：
Fouda-Onana, F.
中科院分区：
文献类型：
--
作者：
Chandesris, M.;Medeau, V.;Fouda-Onana, F.
为了研究温度和电流密度对膜降解的影响，建立了考虑膜化学降解的一维聚合物电解质膜水槽模型。在一维性能模型中，考虑了电子和离子通过不同电池组件的传输以及阳极和阴极催化层的电化学行为。膜降解模型描述了氧从阳极侧向阴极侧的转移、阴极侧过氧氢的形成以及随后通过涉及金属离子杂质的Fenton反应形成自由基以及膜的降解。该模型的开发得到了特定单细胞实验的支持，以验证不同的建模假设并确定性能和退化模型中涉及的一些物理参数。单电池降解实验证实，膜的降解主要发生在阴极侧，温度对降解率也有很大影响。电流密度对退化速率的影响较为复杂，在较低的电流密度下出现最大值。该模型很好地捕捉到了实验中观察到的这一现象。然后利用该模型研究了膜厚随时间的变化规律。性能和化学降解模型之间的耦合允许捕捉膜减薄的加速。版权所有(C)2014，氢能源出版有限责任公司。爱思唯尔有限公司出版。保留所有权利。
In this work, a 1D polymer electrolyte membrane water electrolyzer (PEMWE) model that incorporates chemical degradation of the membrane is developed to study the influence of temperature and current density on the membrane degradation. In the 1D performance model, electronic and ionic transports through the different cell components are considered together with the electrochemical behavior of the anodic and cathodic catalyst layers. The membrane degradation model describes the oxygen cross-over from the anode to the cathode side, the formation of hydrogen peroxyde at the cathode side together with the subsequent formation of radicals via Fenton reactions involving metal-ion impurities and the membrane degradation. The development of the model is supported by specific single cell experiments to both validate the different modeling assumptions and determine some of the physical parameters involved in the performance and degradation models. The single-cell degradation tests confirm that most of the membrane degradation occurs at the cathode side and also show the strong influence of the temperature on the degradation rate. The effect of the current density on the degradation rate is more complex and presents a maximum at quite low current density. This phenomena, observed in the experiments, is well captured by the model. The model is then used to study the time evolution of the membrane thickness. The coupling between the performance and the chemical degradation models allows to capture the acceleration of membrane thinning. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.