Abstract
In neutral solution, an oxide-free zinc surface can be prepared at −1.4 V vs. SCE. The electrochemical oxidation of this surface is found to proceed by the formation of a monolayer film that passivates the surface initially. This film is retained in the transpassive region, suggesting that evolution of Zn(II) ions proceeds via a place exchange mechanism. Reduction of Zn(II) ions from solution is the reverse of this mechanism, and only after reduction of the Zn-O monolayer below −1.2 V does electrodeposition of zinc lead to a roughened surface.
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