Oxygen Overvoltage Measurements on Bright Platinum in Acid Solutions

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Abstract
Oxygen overvoltage measurements were made on a Pt/O2 electrode in ‐stabilized acid solutions. The concentration of was 0.1M. It was found that the rest potential did not reach the reversible potential (682 mv), and was independent of the concentration and of the partial pressure of oxygen. These findings are explained in terms of a polyelectrode model in which the rest potential is a mixed potential composed of the half reactions and . From the polarization data, it is concluded that the mixed potential and the electrode kinetics are controlled by the reaction The system acts as though it were a reversible electrode with an Eo of 810 mv. A value of mho is calculated for the rate of the electrode reaction. The rate‐determining step both in the anodic and the cathodic directions involves the discharge of the first electron.

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