Various amounts of 20wt.% Pt/C catalyst (56.7-5.7 pgcarbon cm'2) were loaded on glassy carbon (GC) disk electrode, and the effect o f its agglomeration on hydrogen peroxide formation in oxygen reduction was investigated by the rotating ring-disk electrode technique. The formation of H2O2 was enhanced with a reduction in agglomeration o f Pt/C. Even in the operating potential range o f PEFC cathodes (0.6-0.8 V), 10% hydrogen peroxide was formed at 5.7 p g carbon cm'2 Pt/C loaded on GC. These

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... lts revealed that series 2-electron reduction pathway, which is negligible on clean bulk Pt surface, does exist on Pt particles supported on carbon.