Electroreduction of cobalt-amino peroxo complexes. Part 1. - The reduction of oxygen in the Co(II) + ammonia system

Armand Bettelheim; M. Faraggi; I. Hodara; J. Manassen

doi:10.1039/F19777300143

Electroreduction of cobalt-amino peroxo complexes. Part 1. - The reduction of oxygen in the Co(II) + ammonia system

Armand Bettelheim, M. Faraggi, I. Hodara, J. Manassen

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Abstract

The electroreduction of O₂ in Co(II) + NH₃ solutions has been investigated using the rotating disc electrode technique. It was found that the electroactive species, in the potential range 0 to -1 V against s.c.e., are O₂ and the peroxo complex [(NH₃)₅Co-O₂-Co(NH₃) ₅]⁺⁴. The electro-activity of the complex was shown by the appearance of a new cathodic wave and by the linear increase of the limiting current of this wave with the peroxo complex concentration. It is suggested that four electrons are involved in the reduction of the complex on a Pt rotating disc electrode. Its diffusion coefficient was calculated to be 8.6 × 10^-6 cm² s^-1. The decomposition of the peroxo complex to form a mononuclear complex of Co(III) was a slow process (k = 3.0 × 10^-6 s^-1).

Original language	English
Pages (from-to)	143-149
Number of pages	7
Journal	Physical Chemistry Chemical Physics
Volume	73
DOIs	https://doi.org/10.1039/F19777300143
State	Published - 1 Dec 1977
Externally published	Yes

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General Chemistry

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title = "Electroreduction of cobalt-amino peroxo complexes. Part 1. - The reduction of oxygen in the Co(II) + ammonia system",

abstract = "The electroreduction of O2 in Co(II) + NH3 solutions has been investigated using the rotating disc electrode technique. It was found that the electroactive species, in the potential range 0 to -1 V against s.c.e., are O2 and the peroxo complex [(NH3)5Co-O2-Co(NH3) 5]+4. The electro-activity of the complex was shown by the appearance of a new cathodic wave and by the linear increase of the limiting current of this wave with the peroxo complex concentration. It is suggested that four electrons are involved in the reduction of the complex on a Pt rotating disc electrode. Its diffusion coefficient was calculated to be 8.6 × 10-6 cm2 s-1. The decomposition of the peroxo complex to form a mononuclear complex of Co(III) was a slow process (k = 3.0 × 10-6 s-1).",

author = "Armand Bettelheim and M. Faraggi and I. Hodara and J. Manassen",

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T1 - Electroreduction of cobalt-amino peroxo complexes. Part 1. - The reduction of oxygen in the Co(II) + ammonia system

AU - Bettelheim, Armand

AU - Faraggi, M.

AU - Hodara, I.

AU - Manassen, J.

PY - 1977/12/1

Y1 - 1977/12/1

N2 - The electroreduction of O2 in Co(II) + NH3 solutions has been investigated using the rotating disc electrode technique. It was found that the electroactive species, in the potential range 0 to -1 V against s.c.e., are O2 and the peroxo complex [(NH3)5Co-O2-Co(NH3) 5]+4. The electro-activity of the complex was shown by the appearance of a new cathodic wave and by the linear increase of the limiting current of this wave with the peroxo complex concentration. It is suggested that four electrons are involved in the reduction of the complex on a Pt rotating disc electrode. Its diffusion coefficient was calculated to be 8.6 × 10-6 cm2 s-1. The decomposition of the peroxo complex to form a mononuclear complex of Co(III) was a slow process (k = 3.0 × 10-6 s-1).

AB - The electroreduction of O2 in Co(II) + NH3 solutions has been investigated using the rotating disc electrode technique. It was found that the electroactive species, in the potential range 0 to -1 V against s.c.e., are O2 and the peroxo complex [(NH3)5Co-O2-Co(NH3) 5]+4. The electro-activity of the complex was shown by the appearance of a new cathodic wave and by the linear increase of the limiting current of this wave with the peroxo complex concentration. It is suggested that four electrons are involved in the reduction of the complex on a Pt rotating disc electrode. Its diffusion coefficient was calculated to be 8.6 × 10-6 cm2 s-1. The decomposition of the peroxo complex to form a mononuclear complex of Co(III) was a slow process (k = 3.0 × 10-6 s-1).

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JO - Physical Chemistry Chemical Physics

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Electroreduction of cobalt-amino peroxo complexes. Part 1. - The reduction of oxygen in the Co(II) + ammonia system

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