Zinc Electrode Morphology in Alkaline Solutions: I . Study of Alternating Voltage Modulation on a Rotating Disk Electrode

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Abstract
The behavior and morphology of a zinc rotating disk electrode charged with superimposed square‐wave alternating voltage (AV) in a concentrated alkaline zincate solution have been investigated with an AV‐modulation technique. The study covered a range of AV from 0 to 200 mV rms and of frequency from 1 to 100 Hz. At low cathodic d‐c overpotentials normally encountered in battery operations, AV greatly improved the current distribution and changed the nonadherent mossy zinc deposit into a compact epitaxial deposit. At higher cathodic d‐c overpotentials, the effect of AV diminished; however, superimposition of AV seemed to widen the potential region for the growth of epitaxial deposit. For the anodic dissolution reaction, AV was found to increase the incidence of pitting corrosion. In addition, AV behaved as a depolarizer and substantially increased the d‐c current density in the voltametry measurements.

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