ChemInform Abstract: Quantitative Detection of Peroxide Formation During Oxygen Reduction on Platinum in Alkaline Media

Abstract

022ChemInform Abstract using the novel technique of cyclic potential ring measurements (CPRM) and for comparison the conventional RRDE technique. Using the CPRM method, in which the ring electrode is continuously cleaned by sweeping it anodically and cathodically to the peroxide detection potential, a considerably larger fraction of H2O2 (50-60%) is produced during oxygen reduction on oxidized Pt compared to 20-25% in the case of RRDE. It is concluded that this discrepancy is due to a changing ring surface at the RRDE and that peroxide plays a greater role in oxygen reduction on oxidized Pt in alkaline media than previously reported.