Abstract
Electrochemical reduction of oxygen on a nickel electrode in alkaline solutions has been studied using the rotating ring-disk-electrode method. The change in the ratio of two possible reaction courses ( viz with or without intermediate formation of hydrogen peroxide) depends on the potential degree of electrode oxidation and the composition. Oxidation of the nickel electrode surface leads to considerable inhibition of oxygen reduction accompanied by increased hydrogen-peroxide yields. In LiOH solution the contribution of the reaction with intermediate hydrogen-peroxide formation is less, as compared with the KOH solution. The constants of individual reaction steps of the oxygen-reduction reaction have been calculated. A study has been made of the hydrogen-peroxide reduction, oxidation and catalytic decomposition on the nickel electrode. Hydrogen peroxide does not undergo decomposition. Increase in the oxidation state of the electrode surface inhibits hydrogen-peroxide reduction, but scarcely affects its electrochemical oxidation.
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