hide
Free keywords:
Models of non-equilibrium phenomena; Electrochemical methods; Surface chemical reactions; Hydrogen peroxide; Silver electrode
Abstract:
Recent electrochemical studies of the cathodic reduction of hydrogen peroxide (H2O2) on silver electrodes in acidic electrolyte (HClO4) revealed a novel autocatalytic reaction path. Adsorbed hydroxyl groups, OHad, were proposed to act as the catalyst. To gather further clarity about this mechanism, in particular about the presence and nature of the postulated adsorbate formed as an intermediate, constitute the autocatalytically active species. In order to obtain a clearer conception of the species OHad, in the present work surface science experiments on Ag(111) electrodes are evaluated. It is concluded that the species OHad is identical with the surfaceAgOH formed in alkaline solution as a relatively stable intermediate in the anodic oxidation of OH– to surface-Ag2O.
