Abstract
A potentiostatic study of polycrystalline cadmium anodes (99.99%) in KOH solutions has been performed. The correspondingI-t curves obtained for potentials between −840 and −890mV (versus Hg/HgO, KOHsin) show a minimum and a maximum of current for all the concentrations of KOH empoloyed, except for 0.5 M.
The mathematical treatment applied to the region appearing after the current minimum suggests that the cadmium oxide growth on the metal takes place according to a diffusion-controlled, three-dimensional hemispherical electrocrystallization with progressive nucleation. However, a change in the type of nucleation must be accepted, from progressive for short times to instantaneous for larger times. This change is more pronounced when the KOH concentration increases and explains the (I 2/J 2m ) versus (t/t m) and the logI versus logt plots established for the different models of electrocrystallization.
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Garrido, J.A., Centellas, F., Cabot, P.L. et al. Potentiostatic study of the electrochemical nucleation of oxide films on cadmium in alkaline solutions. J Appl Electrochem 17, 1093–1099 (1987). https://doi.org/10.1007/BF01024375
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DOI: https://doi.org/10.1007/BF01024375