Dioxygen Reduction in Various Acid Electrolytes

Abstract : Dioxygen reduction has been examined in several new acid electrolytes and mixtures of these electrolytes with concentrated phosphoric acid (used in present acid H2-O2 fuel cells). The polarization curves have been determined on smooth platinum with the rotating disk and ring-disk electrodes and on high-area platinum with gas-fed electrodes of the semi-hydrophobic-type. The polarization is less than with concentrated H3PO4 in some of these alternative electrolytes. Possible explanations are discussed.... Dioxygen reduction in new acid electrolytes and mixtures with concentrated phosphoric acid. Dependence of electrocatalytic activity on electrolyte properties.