Potential of zero charge of platinum stepped surfaces: a combined approach of CO charge displacement and N2O reduction

摘要: The relationship between the potential of zero total charge (pztc) and step density for a series n(111)×(111) stepped platinum single-crystals in perchloric acid using CO displacement is presented. Since gives rise to ‘global average’ local pztc terrace surface contributions charge, we have tried use N2O reduction as probe order generate analogous data that found with displacement, but derived from values pztc. This procedure outlined detail. Agreement determinations be good highly surfaces (average width <7) increasingly poor containing wide (111) terraces. behaviour has been rationalised within framework emphasising role played by electrosorbed water blocking adsorption sites, which would not necessarily detected via displacement. It proposed exhibit overlap hydrogen anion ranges, For are well separated (Pt(111) HClO4), maximum displaced positively respect determined As increased it sites shifts more positive potentials whereas shift negative potentials. suggested this phenomenon reflection redistribution increases.