Abstract
H2O2 formation on Pt/C catalyst and Pt1Run/C (n = 1/3, 1/2, 1, 3/2, 2) catalysts was studied with rotating ring-disk electrode (RRDE) in 0.5 M H2SO4. H2O2 formation on Pt/C catalyst and Pt1Run/C catalysts with smaller Ru content increased sharply below 0.1 V vs. RHE. On the other hand, for larger Ru content catalysts, Pt1Run/C (n = 1, 3/2, 2), their H2O2 formation was lower than that of smaller Ru content catalysts below 0.1 V vs. RHE. Pt1Run/C catalysts with larger Ru content prevented H2O2 formation in anode catalyst layer and mitigated membrane degradation in PEFC. Potential cycles between 0.1 V and 1.0 V and between 0.1 V and 1.2 V vs. RHE were applied for Pt1Ru2/C catalyst. H2O2 formation below 0.1 V vs. RHE increased after potential cycles. Ru dissolution from Pt1Ru2/C catalyst was considered to promote H2O2 formation.
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