Abstract
Nickel(II) in acidic thiocyanate solution gave a catalytic polarographic wave which appears as a maximum in the potential region between −0.6 and −1.0 V vs. SCE. The characteristics of this catalytic current have been investigated by d.c. polarography, i-t curve analysis, cyclic voltammetry, a.c. polarography and controlled potential electrolysis. A mechanism which involves a rapid adsorption equilibrium between the bulk and adsorbed nickel(II)-thiocyanate complex and oxidation of electroreduced metallic nickel with thiocyanate ion has been presented and discussed. Hydrogen ions act as a neutralizing agent of the reduction products of thiocyanate ions, cyanide and sulphide ions. The oxidation of metallic nickel with thiocyanate ions has been estimated by the reaction of Raney nickel with thiocyanate ions.
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