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We studied the isothermal hydrogen adsorption and reaction at the carbon and platinum (Pt) surface of the humidified E-TEK electrode of a polymer electrolyte fuel cell (PEMFC) with a Nafion ® 117 membrane by impedance spectroscopy at 30 and 50 ° C. We found three rate-limiting steps, one of them is interpreted as proton hydration, a step that has not been reported previously. We analysed the...
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