Oxygen Overvoltage on Bright Palladium in Acid Solutions

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Abstract
Oxygen overvoltage measurements were made both galvanostatically and potentiostatically on bright Pd electrodes in solutions. The anodic evolution and the cathodic reduction of oxygen were investigated, and, in general, the two measuring techniques gave the same kinetic results. The overvoltage curves exhibited a mixed potential region followed by a Tafel region. In the anodic curves these two regions were separated by a limiting current or passivation region. It was found that Pd is a poorer peroxide‐decomposing catalyst than Pt, that a film of adsorbed is a poor electronic conductor, that oxygen is evolved on a Pd anode through an oxide mechanism, the decomposition of to and O2, and that oxygen is reduced from the adsorbed oxygen molecules on a Pd cathode.

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