Abstract
The electrolytic nucleation of mercury on platinum single-crystal electrodes is used to study the behaviour of the oxide layer covering the platinum surface. The platinum electrode is treated periodically with nitric acid prior to the nucleation process. The activity of the electrode in regard to the nucleation process increases with the increase both of the concentration of the nitric acid and of the time of treatment. It is concluded that in the presence of nitric acid at open circuit the oxide layer is progressively removed from the platinum surface.
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