Adsorption behavior of the bipyridine complex of cobalt(I) at a mercury electrode

The adsorption behavior of cobalt(I) bipyridine complex has been investigated in ammonia buffer solutions at pH 8.5 by cyclic voltammetry. Reduction wave III corresponded to the polarographic wave due to the reduction of Co(II) to Co(I) and was diffusion-controlled. On the other hand, two anodic wav...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry and interfacial electrochemistry 1988-09, Vol.251 (1), p.193-199
Main Authors: Kato, Nakahide, Abe, Yukino, Nakano, Kunio, Tanaka, Kazuyoshi, Aoki, Koichi
Format: Article
Language:English
Subjects:
Adsorption
Chemistry
Electrochemistry
Electrodeposition
Exact sciences and technology
General and physical chemistry
Study of interfaces
Transport phenomena
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Summary:The adsorption behavior of cobalt(I) bipyridine complex has been investigated in ammonia buffer solutions at pH 8.5 by cyclic voltammetry. Reduction wave III corresponded to the polarographic wave due to the reduction of Co(II) to Co(I) and was diffusion-controlled. On the other hand, two anodic waves, I and II, due to the oxidation of Co(I) to Co(II), were observed; these are surface waves, whose peak potentials are −(0.88 ± 0.01) and −(0.95 ± 0.01) V vs. SCE, respectively. When the scan rate was higher than 300 mV/s, the direct oxidation wave of [Co(bpy) 3] + was also found. The adsorption in the two waves I and II took place in multilayer form and anodic wave II decreased with time due to chemical reaction, yielding wave I. The electrode reaction mechanism of tris(bipyridine)cobalt(III) complex is also discussed.
ISSN:0022-0728
DOI:10.1016/0022-0728(88)80396-6