Effect of Dissolved Iron on Oxygen Reduction at a Pt/C Electrode in Sulfuric Acid

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Abstract
The activity of supported on Vulcan XC-72R carbon catalyst for oxygen reduction in the absence and presence of dissolved in was measured. The catalyst in sulfuric acid with dissolved in the electrolyte was far more active for oxygen reduction than those without dissolved . The activity of for oxygen reduction in in the presence of dissolved is doubled at , at vs. a standard hydrogen electrode. The mechanism of enhancement is due to the reaction of dissolved and to form hydroperoxy complexes, followed by the heterogeneous decomposition on to release . ©2000 The Electrochemical Society