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.
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