The Importance of Anodic Discharge of H 2 O in Anodic Oxygen‐Transfer Reactions

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Abstract
Difference voltammetry at rotated disk electrodes was applied to a study of several anodic O‐transfer reactions that appear to occur concurrently with evolution. This voltammetric technique was useful for extracting the rotation‐dependent component of the total current from the large, virtually rotation‐independent current for evolution. Data for oxidation of I− at Pt, Au, Pd, Ir, and glassy carbon electrodes show that the for production is correlated with the overpotential for evolution at these electrode materials. Data obtained at an Ir electrode for various reactions with widely varying values reveal uniform values closely correlated with the potential for onset of evolution in both alkaline and acidic solutions. The results support the conclusion that the anodic discharge of is a prerequisite of these anodic O‐transfer mechanisms.

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