Abstract
Sodium‐tungsten bronzes of the general formula , with high and low platinum contents, were investigated regarding their electrocatalytic activity towards the reduction of oxygen and hydrogen peroxide in sulfuric acid solutions. Contrary to the findings of some other workers are found to be poor catalysts for the cathodic reduction of oxygen. The presence of platinum in the bronze at concentrations in the 1000 ppm range does not increase significantly the catalytic properties of the bronze electrode. Sodium tungsten bronzes are relatively good catalysts for the cathodic reduction of hydrogen peroxide in acid solutions. The reaction is first‐order with respect to the concentration and zero‐order with respect to the H+ concentration. The steady‐state current‐potential curve exhibits a slope of and, at more cathodic potentials, a characteristic inhibition inflection. In contrast to other electrodes the cathodic reduction of on occurs at potentials less cathodic than those required for the reduction of oxygen.
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