Abstract
Oxygen overvoltage measurements were made on platinum electrodes which had been passivated in nitric acid. It was demonstrated that the reversible oxygen electrode may be obtained. Apparently, the treatment with significantly changes the nature of the platinum surface, and it is suggested that the Pt surface is converted to a Pt‐O alloy. The Pt‐O‐alloy surface not only is a better peroxide decomposing catalyst than Pt, but also accelerates the adsorption of oxygen and the electron transfer step. Although the overvoltage is independent of the partial pressure of oxygen for large values of , the rate‐determining step is considered to be the discharge step The rate of reduction of oxygen is increased by two orders of magnitude on Pt‐O‐alloy electrodes from that on Pt electrodes, and the overvoltage is reduced by at least 200 mv.
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