The Activation of Polycrystalline Gold to the Hydrogen Electrode Reaction Promoted with Repetitive Potentiodynamic Perturbations

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Abstract
The activation of gold electrodes toward the hydrogen electrode reaction is studied using the polycrystalline interface at 25°C. The electrode activation is promoted by potentiodynamic aging in the potential range where the O‐electrosorption/O‐electrodesorption takes place. The activation effect is comparable to that earlier described when gold electrodes are cathodized for a relatively long time in the potential range of the net evolution of hydrogen. The activation effect is revealed through the appearance of a remarkable increase of current associated with the hydrogen ion discharge and an anodic current related to the electrooxidation of hydrogen. For the latter, different contributions are distinguished, namely, the molecular diffusion and those related to adsorbed and probably absorbed hydrogen. The electrochemical characteristics of the interface are related to a large extent to the restructuring of the metal surface.

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