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Issue 34, 2015
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Potentiostatic current and galvanostatic potential oscillations during electrodeposition of cadmium

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Abstract

Cathodic current and potential oscillations were observed during electrodeposition of cadmium from a cyanide electrolyte on a vertical platinum electrode, in potentiostatic and galvanostatic experiments. Electrochemical impedance spectroscopy experiments revealed a region of negative real impedance in a range of non-zero frequencies, in the second descending branch with a positive slope of the N-shape current–potential curve. This kind of dynamical behaviour is characteristic of the HN-NDR oscillators (oscillators with the N-Shape current–potential curve and hidden negative differential resistance). The oscillations could be mainly attributed to the changes in the real active cathodic area, due to the adsorption of hydrogen molecules and their detachment from the surface. The instabilities of the electrochemical processes were characterized by time series, Fast Fourier Transforms and 2-D phase portraits showing quasi-periodic oscillations.

Graphical abstract: Potentiostatic current and galvanostatic potential oscillations during electrodeposition of cadmium

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Article information


Submitted
04 Jun 2015
Accepted
20 Jul 2015
First published
21 Jul 2015

Phys. Chem. Chem. Phys., 2015,17, 22266-22271
Article type
Paper
Author version available

Potentiostatic current and galvanostatic potential oscillations during electrodeposition of cadmium

D. A. López-Sauri, L. Veleva and G. Pérez-Ángel, Phys. Chem. Chem. Phys., 2015, 17, 22266
DOI: 10.1039/C5CP03253A

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