Abstract
In this work the study of nickel deposition on to carbon felt from chloride and sulphate electrolytes at pH 3, using electrochemical impedance spectroscopy, is presented. Results compare favourably to previous studies with the mechanism of nickel deposition dependent on the concentration and applied potential. All impedance spectra are characterised by the presence of a semicircle feature at high frequencies and by complex inductance features at low frequencies. For impedance studies performed in sulphate and chloride electrolytes, at potentials not corresponding to nickel deposition, an ion effect is observed. This effect is attributed to the formation of adsorbed pre-deposition intermediates; H ads in sulphate and chloride electrolytes and Ni(Cl) ads only in chloride electrolytes.
Published Version
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