Electrocatalysis of Anodic Oxygen‐Transfer Reactions: Effect of Groups III A and VA Metal Oxides in Electrodeposited β‐Lead Dioxide Electrodes in Acidic Media

Abstract

The heterogeneous rate constant for the anodic oxidation of Mn(II) at mixed oxide electrodes in was determined as a function of high doping levels by the oxides of Group III A and VA metals. Electrodes were prepared by electrodeposition from solutions containing Pb2+ and the doping metal ions in . Doping with the Group III A metal oxides results in a slight decrease in the rate constant for Mn2+ oxidation; however, doping with the Group VA metal oxides results in significant electrocatalysis of the anodic oxygen transfer reaction, as compared to a pure electrode. The rate constant at the mixed oxide deposited from a solution of 1.0 mM Bi3+/1.0 mM Pb2+ was at least 25 times greater than for pure , becoming virtually mass‐transfer limited at the mixed oxide electrode to rotation rates of 3600 rev min−1.