Abstract
Oxygen reduction at gold cathodes was studied chronopotentiometrically. In sodium hydroxide solutions two waves are observed. The first of these, due to the reduction of oxygen to hydrogen peroxide, is longer than the 2-electron value due to the surface-catalyzed disproportionation of hydrogen peroxide which regenerates more oxygen. This effect is most pronounced at an electrode which has been recently anodized and cathodized (pre-treated). The effect diminishes as the electrode is allowed to stand in contact with the test solution. The total transition time for the two waves is unaffected by electrode treatment. In sulfuric acid a single wave due to the 2-electron reduction is observed at a pre-treated electrode. In other media of pH between 1.6 and 12, two oxygen reduction waves are observed.
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