Experimental measurement of effective diffusion coefficient of gas diffusion layer/microporous layer in PEM fuel cells

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DOIResolve DOI: http://doi.org/10.1016/j.electacta.2011.12.110
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TypeArticle
Journal titleElectrochimica Acta
ISSN00134686
Volume65
Pages1321
SubjectDiffusion; Porous media; Fuel cell; Carbon paper; Gas diffusion layer; Microporous layer; Diffusion coefficient; Knudsen effect; Loschmidt cell
AbstractAccuracy in the effective diffusion coefficient of the gas diffusion layer (GDL)/microporous layer (MPL) is important to accurately predict the mass transport limitations for high current density operation of polymer electrolyte membrane (PEM) fuel cells. All the previous studies regarding mass transport limitations were limited to pure GDLs, and experimental analysis of the impact of the MPL on the overall diffusion in the porous GDL is still lacking. A modified Loschmidt cell with an oxygen–nitrogen mixture is used in this work to determine the effect of MPL on the effective diffusion coefficients. It is found that Knudsen effects play a dominant role in the diffusion through the MPL where pore diameters are less than 1 μm. Experimental results show that the effective diffusion coefficient of the MPL is only about 21% that of its GDL substrate and Knudsen diffusion accounts for 80% of the effective diffusion coefficient of the GDL with MPL measured in this study. No existing correlations can correlate the effective diffusion coefficient with significant Knudsen contribution.
Publication date
LanguageEnglish
AffiliationNRC Institute for Fuel Cell Innovation; National Research Council Canada
Peer reviewedYes
IdentifierS0013468611019487
NPARC number21268730
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Record identifier79d00e87-8648-4413-be72-3cc3c91e8fb8
Record created2013-11-08
Record modified2016-05-09
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