E. Itabashi, Masafumi Tan
Apr 25, 1975
Citations
0
Influential Citations
26
Citations
Journal
Journal of Electroanalytical Chemistry
Abstract
Summary Cobalt(II) or cobalt(III) after its one electron reduction in thiocyanate solution containing perchloric acid or acetate buffer at dropping and stationary mercury electrodes exhibited a catalytic current in the potential region between −1.0 and −1.25 V vs . SCE. The characteristics of the catalytic current have been investigated by conventional polarography, cyclic voltammetry, chronoamperometry and controlled potential electrolysis. A mechanism which involves the cyclic regeneration of cobalt(II) by the oxidation of electrodeposited metallic cobalt with thiocyanate ion has been presented. Hydrogen ions act as a neutralizing agent on the reduction products of thiocyanate ion, cyanide and sulphide ions. The regeneration of cobalt(II) has been postulated from the fact that the reaction of Raney cobalt with thiocyanate ions affords divalent cobalt, cyanide and sulphide ions.