A study of the effect of compression on the performance of polymer electrolyte fuel cells using electrochemical impedance spectroscopy and dimensional change analysis |
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Authors: | Thomas J Mason Jason MillichampPaul R Shearing Daniel JL Brett |
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Affiliation: | Electrochemical Innovation Lab, Department of Chemical Engineering, UCL, London WC1E 7JE, UK |
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Abstract: | Compression plays an important role in the performance of polymer electrolyte fuel cells (PEFCs). In this study, dynamic compression is applied using a cell compression unit (CCU) to study the effect on performance of a membrane electrode assembly (MEA) with dimension change. The stress/strain characteristics of the MEA are observed to be dominated by the gas diffusion layer (GDL), with the GDL exhibiting a degree of plasticity. Electrochemical impedance spectroscopy (EIS) is used to delineate the effect of compression on contact resistance and mass transfer losses. |
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Keywords: | Contact resistance Compression Diagnostics Membrane electrode assembly Electrochemical impedance spectroscopy Gas diffusion layer |
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