Title: Kinetics of Fuel Cell Reactions at the Platinum/Solid Polymer Electrolyte Interface
Abstract: Platinum gauze electrodes coated with the proton‐conducting polymer, Nafion, were investigated with respect to the kinetics of the oxygen reduction and hydrogen oxidation reactions. The coated electrodes were in contact with a Nafion membrane electrolyte. The current‐potential behavior of the coated electrodes depended upon the thickness of the coating. The electrodes with thicker coatings exhibited less activation and ohmic control but encountered diffusion limitations. Those with thinner coatings showed significant ohmic control. A theoretical analysis was made for the current‐potential relation and the current distribution using a model of a Nafion‐coated wire in contact with the membrane. The present analysis confirms the necessity of optimizing the amount of Nafion impregnation in low‐Pt‐loaded, porous gas‐diffusion electrodes, as was experimentally observed in another study in our laboratory.
Publication Year: 1989
Publication Date: 1989-03-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 53
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