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A PEM fuel cell with a Nafion 211 membrane-based membrane electrode assembly (MEA) was tested with an H 2 /air stoichiometry of 2/4 at 25%, 50%, 75%, and 100% relative humidities. A voltage jump on the polarization curve was observed when the cell was operated at a lower humidity. This phenomenon may be explained by the water back-diffusion from the cathode into the membrane resulting in both...
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