The Mechanism of the Cobalt Anodic Ionization in Chloride Solution
F. D. Manilevich, L. F. Kozin, A. K. Bogdanova, and B. I. Danil’tsev
Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine,
pr. Palladina 32/34, Kiev, 03680 Ukraine
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Received March 18, 2004
Abstract — The mechanism of the cobalt anodic ionization in 2.5 M CoCl2 solution (pH 3.5 
0.2, t = 15–60°C) is studied with the use of rotating disk electrode and rotating ring–disk electrode methods. The experimental data showed that the ionization proceeds by stages, of which the first is an intermediate CoAads species formation (A is Cl– or OH–), in which the cobalt oxidation state is 1+. Further CoAads transformation involves rapid parallel reactions of the Co+ ions electrochemical oxidation or disproportionation. An oxidation current wave was revealed at the platinum ring electrode for the species formed during the cobalt anodic ionization at the disk electrode. Judging by the wave potential, these species can be either finely dispersed elemental cobalt or the intermediate Co+ ions.
0.2, t = 15–60°C) is studied with the use of rotating disk electrode and rotating ring–disk electrode methods. The experimental data showed that the ionization proceeds by stages, of which the first is an intermediate CoAads species formation (A is Cl– or OH–), in which the cobalt oxidation state is 1+. Further CoAads transformation involves rapid parallel reactions of the Co+ ions electrochemical oxidation or disproportionation. An oxidation current wave was revealed at the platinum ring electrode for the species formed during the cobalt anodic ionization at the disk electrode. Judging by the wave potential, these species can be either finely dispersed elemental cobalt or the intermediate Co+ ions.