Abstract
To clarify the deterioration mechanism for polymer electrolyte fuel cells, the OH radical formation at the catalyst electrodes was investigated by ESR spectroscopy using a flow cell with the catalyst electrodes. OH radical produced from H₂O2 was detected by DMPO spin-trapping method for the Nafion-coated Pt/Carbon catalyst electrode under a high potential (0.85 V vs. RHE ) and on supplying H2 under low potentials (lower than 0.40 V). When Pt-Ru catalysts were employed in place of Pt catalysts, the formation of OH radical was barely detected. Though the experiments were performed in the presence of DMPO, the results suggested the possibility of the formation of OH radical by the oxidation of H₂O₂ at the cathode of polymer electrolyte fuel cells.
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