Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 160, Issue 2, Pages F81-F89Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.036302jes
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Funding
- Natural Sciences and Engineering Research Council of Canada
- Automotive Fuel Cell Cooperation
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The Knudsen diffusivity and viscous permeability of proton exchange membrane fuel cell microporous coated gas diffusion layers are obtained experimentally for different polytetrafluoroethylene loadings. Pressure drop across the microporous coated gas diffusion layers is measured at varying flow rates and using different gases. A semi-empirical expression proposed by Knudsen is used to analyze the experimental results and is shown to accurately predict gas transport in microporous coated gas diffusion layers. The Knudsen diffusivity of the microporous coated gas diffusion layers is shown to decrease with increased PTFE loading. The compressible form of Darcy's law is shown to overestimate the viscous permeability of microporous coated gas diffusion layers because it cannot account for gas slip at the pore walls. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.036302jes] All rights reserved.
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