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Publication Detail
A study of the effect of water management and electrode flooding on the dimensional change of polymer electrolyte fuel cells
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Mason TJ, Millichamp J, Neville TP, Shearing PR, Simons S, Brett DJL
  • Publication date:
    2013
  • Pagination:
    70, 77
  • Journal:
    Journal of Power Sources
  • Volume:
    242
  • Print ISSN:
    0378-7753
  • PII:
    S0378775313008240
  • Language:
    eng
  • Keywords:
    Compression, Diagnostics, Electrochemical impedance spectroscopy, Flooding, Swelling, Water management
Abstract
Water management and flooding play an important role in the performance and durability of polymer electrolyte fuel cells (PEFCs). In this study, a dynamic electro-mechanical analysis is performed to examine the performance of a working PEFC during hydration transients and flooding events. Cell resistance is measured using electrochemical impedance spectroscopy (EIS), and the stress/strain characteristics - cell compression and membrane electrode assembly (MEA) dimensional change - are studied using a controlled compression unit (CCU). Ex-situ measurements of membrane thickness as a function of hydration level provide a direct correlation between ionic conductivity and thickness. During initial hydration of Nafion membranes there is a direct relationship between membrane conductivity and dimensional change (swelling) of MEAs. Electrode flooding is found to result in membrane hydration and an increase in stress or strain, depending on the compression mode of the fuel cell. Results suggest that hydration cycles and flooding events can lead to cell degradation due to the stresses imposed. © 2013 Elsevier B.V. All rights reserved.
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Dept of Chemical Engineering
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Dept of Chemical Engineering
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Dept of Chemical Engineering
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