Hydrogen peroxide and oxygen reduction studies on Pt stepped surfaces: Surface charge effects and mechanistic consequences

Abstract The hydrogen peroxide reduction reaction (HPRR) is investigated on Pt(111) as well as on Pt(S)[(n-1)(111) × (110)] and Pt(S)[n(111) × (100)] stepped surfaces in 0.1 M HClO4 by means of voltammetric studies using the hanging meniscus rotating disk electrode (HMRDE) configuration. Results point out that there is a direct correlation between the potential value (Einhibition) at which the inhibition of the HPRR at low potential starts and the local potential of maximum entropy (pme) for the terraces. In addition, there is also a correspondence between the potential of the peak (Epeak) that appears at E