Corrosion-Induced Microstructural Variability Affects Transport-Kinetics Interaction in PEM Fuel Cell Catalyst Layers
Corrosion-Induced Microstructural Variability Affects Transport-Kinetics Interaction in PEM Fuel Cell Catalyst Layers
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DOI：
10.1149/1945-7111/ab927c
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发表时间：
2020-05-20
影响因子：
3.9
通讯作者：
Mukherjee, Partha P.
中科院分区：
文献类型：
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作者：
Goswami, Navneet;Mistry, Aashutosh N.;Mukherjee, Partha P.
离子单体负责质子传输、氧到达反应位点以及结合碳载体颗粒，在决定催化剂层性能方面起着核心作用。在这项工作中，我们基于结合中尺度模型和基于实验图像的数据，研究了离子分布对催化剂层腐蚀诱导降解模式的影响。观察到，在孔尺度上，离聚体在铂-碳界面上的覆盖是不均匀的，这反过来又会严重影响电极尺度的性能。此外，对暴露于碳载体腐蚀的原始和退化微观结构的响应的研究表明，催化剂层性能衰减的动力学传输基础是突出的。(C) 2020作者。IOP出版有限公司代表电化学学会出版。
The ionomer, which is responsible for proton transport, oxygen accessibility to reaction sites, and binding the carbon support particles, plays a central role in dictating the catalyst layer performance. In this work, we study the effect of ionomer distribution owing to the corrosion induced degradation mode in the catalyst layer based on a combined mesoscale modeling and experimental image-based data. It is observed that the coverage of the ionomer over the platinum-carbon interface is heterogeneous at the pore-scale which in turn can critically affect the electrode-scale performance. Further, an investigation of the response of the pristine as well as degraded microstructures that have been exposed to carbon support corrosion has been demonstrated to highlight the kinetic-transport underpinnings on the catalyst layer performance decay. (C) 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.