Electrocatalytic Oxidations at Electrodeposited Bismuth (III)‐Doped Beta‐Lead Dioxide Film Electrodes

Heterogeneous rate constants for the anodic oxidation of many inorganic and organic compounds at electrolytically deposited beta ‐ PbO 2 film electrodes in 1.0 M HClO 4 are increased by doping the oxide with Bi(III). The rate constants at the mixed‐oxide electrode rise sharply for a change from 0 to 10 mole percent (m/o) of Bi(III) in the electrodeposition solution, and reach a mass transport‐limited value for some compounds at 40 m/o Bi(III). Results of kinetic, voltammetric, and spectroscopic studies of these electrodes are described. In addition, the lifetime of Bi(III)‐doped PbO 2 film electrodes is discussed as a function of concentration, rotation speed, analyte, and applied voltage.