期刊
JOURNAL OF POWER SOURCES
卷 241, 期 -, 页码 379-387出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.03.165
关键词
Contact mechanics model; Water retention curve; van Genuchten correlation; Catalyst layer micro-porous layer interface; Polymer electrolyte fuel cell; Capillary pressure
资金
- National Science Foundation [1066623]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1066623] Funding Source: National Science Foundation
An elastic deterministic contact mechanics model is applied to the compressed micro-porous (MPL) and catalyst layer (CL) interfaces in polymer electrolyte fuel cells (PEFCs) to elucidate the interfacial morphology. The model employs measured two-dimensional surface profiles and computes local surface deformation and interfacial gap, average contact resistance, and percent contact area as a function of compression pressure. Here, we apply the model to one interface having a MPL with cracks and one with a crack-free MPL. The void size distributions and water retention curves for the two sets of CL vertical bar MPL interfaces under compression are also computed. The CL vertical bar MPL interfaces with cracks are observed to have higher roughness, resulting in twice the interfacial average gap compared to the non-cracked interface at a given level of compression. The results indicate that the interfacial contact resistance is roughly the same for cracked or non-cracked interfaces due to cracks occupying low percentage of overall area. However, the cracked CL vertical bar MPL interface yields higher liquid saturation levels at all capillary pressures, resulting in an order of magnitude higher water storage capacity compared to the smooth interface. The van Genuchten water retention curve correlation for log-normal void size distributions is found to fit non-cracked CL vertical bar MPL interfaces well. (C) 2013 Elsevier B.V. All rights reserved.
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