Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 53, Issue -, Pages 24-28Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2015.02.005
Keywords
X-ray computed tomography; Gas-diffusion layers; Water saturation; Land-channel effects; Compression; Polymer-electrolyte fuel cells
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Funding
- EERE, Fuel Cell Technologies Office, U.S. DOE
- Office of Science, BES [DE-AC02-05CH11231]
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X-ray computed tomography was used to investigate geometrical land and channel effects on spatial liquid-water distribution in gas-diffusion layers (GDLs) of polymer-electrolyte fuel cells under different levels of compression. At low compression, a uniform liquid-water front was observed due to water redistribution and uniform porosity; however, at high compression, the water predominantly advanced at locations under the channel for higher liquid pressures. At low compression, no apparent correlation between the spatial liquid water and porosity distributions was observed, whereas at high compression, a strong correlation was shown, indicating a potential for smart GDL architecture design with modulated porosity. (C) 2015 Elsevier B.V. All rights reserved.
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