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The kinetics of silver͑I͒ oxide formation on polycrystalline silver electrodes in 8 M KOH solution was investigated by cyclic voltammetry, potentiostatic and galvanostatic techniques as well as the morphology of the silver͑I͒ oxide structures by scanning electron microscopy. Potentiostatic investigations revealed unambiguously that the silver͑I͒ oxide may be nucleated in the second stage as well as in the third stage of silver͑I͒ oxide formation. Cyclic voltammograms showed that the second peak current could be larger than the third peak current with repetitive cycling. Microscopic examinations provided undoubted evidence that electrodissolution, nucleation, three-dimensional ͑3D͒ growth, and Ostwald ripening processes are involved in the initial stage of silver͑I͒ oxide formation. In addition, it was found that two types of silver͑I͒ oxide morphologies were formed by progressive nucleation and instantaneous nucleation process. On the basis of the experimental results, a model of silver͑I͒ oxide formation involving electrodissolution, progressive nucleation, instantaneous nucleation, and 3D growth processes is proposed.

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