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The initial stages of the electrocrystallization of zinc from an alkaline electrolyte onto a polycrystalline silver substrate are investigated using the potential step method. In the overpotential region where the reaction is predominantly controlled by charge transfer, computer analysis of the experimental current‐time transients with detailed models of nucleation and growth is possible. This gives information about the kinetics of the reaction and the morphology of the crystal growth. It is concluded that the electrocrystallization of zinc proceeds via nucleation and growth, first of a thin layer of primary centers, having low angle of contact at low overpotentials, and subsequently by a layer, which starts to grow via secondary centers, formed at the sites where the primary centers coalesce.

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The behaviour of porous zinc electrodes was investigated by monitoring the potential distribution along the surface of the electrode during charging and discharging in a nickel oxide-zinc battery. Impedance measurements of the zinc electrode were taken as a function of state-of-charge and of the cycle number. The composition of the electrode was varied with HgO and PbO additives. Shape change was observed for all electrodes. The observed potential distribution has led to the tentative explanation that the shape change phenomenon is caused by diffusion of zincate along the surface.