A Model for Nanolaminated Growth Patterns in Zn and Zn‐Co Electrodeposits

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Abstract
A hydroxide oscillation model has been proposed to account for the observed “nanolaminated” structure in electrodeposited Zn and Zn‐Co alloys produced under potentiostatic control. At a critical cathode potential the Zn deposition proceeds in a cyclically changing environment arising from the regular formation and decay of a zinc hydroxide layer near the cathode surface, which produces Zn‐ZnO laminations in the deposits. Co was found to enrich at the Zn‐ZnO interface. Such a model is supported by evidence obtained from electrochemical measurements and transmission electron microscopy observations, and this has given some insight into the anomalous behavior of Zn‐Co deposition.

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