The general theoretical relationship between cell voltage and current density in both E and FC-modes of a PEM URFC derived here by modifying the standard Butler-Volmer equations gives a good fit with experimentally measured V-I curves, and allows values for exchange current densities, charge transfer coefficients, and saturation current densities to be estimated from the experimental results. The model promises to be useful tool in the design of URFCs with improved performance in both modes. Work is in progress to extend the model to the case of a mix of catalysts on the O-side.
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