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A microelectrode study of the mechanism of the reactions of silver(II) with manganese(II) and chromium(III) in sulphuric acid

A microelectrode study of the mechanism of the reactions of silver(II) with manganese(II) and chromium(III) in sulphuric acid
A microelectrode study of the mechanism of the reactions of silver(II) with manganese(II) and chromium(III) in sulphuric acid
The variation of the steady state limiting current for the Ag(I)/Ag(II) oxidation wave with the radius of the microdisc electrode, concentration and temperature has been used to probe the kinetics and mechanisms for the reactions of silver(II) with manganese(II) and chromium(III) in 10 mol dm?3 sulphuric acid. It is shown that the current density for the silver(I) mediated oxidation of manganese(II) is controlled by the diffusion of manganese(II) to the surface except for microelectrodes with radii below 5 ?m. On the other hand, the current density for the mediated oxidation of chromium(III) is determined by the rate of the Ag(II)/Cr(III) reaction over a range of conditions. In contrast to the Ag(II)/water reaction, its kinetics can be fitted to a mechanism where the initial electron transfer from Cr(III) to the Ag(II) is the rate determining step.

1572-6657
255-265
Denuault, G.
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Fleischmann, M.
efa03344-c36e-4bc1-bda6-540ba986c39d
Pletcher, D.
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Denuault, G.
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Fleischmann, M.
efa03344-c36e-4bc1-bda6-540ba986c39d
Pletcher, D.
f22ebe69-b859-4a89-80b0-9e190e6f8f30

Denuault, G., Fleischmann, M. and Pletcher, D. (1990) A microelectrode study of the mechanism of the reactions of silver(II) with manganese(II) and chromium(III) in sulphuric acid. Journal of Electroanalytical Chemistry, 280 (2), 255-265. (doi:10.1016/0022-0728(90)87002-2).

Record type: Article

Abstract

The variation of the steady state limiting current for the Ag(I)/Ag(II) oxidation wave with the radius of the microdisc electrode, concentration and temperature has been used to probe the kinetics and mechanisms for the reactions of silver(II) with manganese(II) and chromium(III) in 10 mol dm?3 sulphuric acid. It is shown that the current density for the silver(I) mediated oxidation of manganese(II) is controlled by the diffusion of manganese(II) to the surface except for microelectrodes with radii below 5 ?m. On the other hand, the current density for the mediated oxidation of chromium(III) is determined by the rate of the Ag(II)/Cr(III) reaction over a range of conditions. In contrast to the Ag(II)/water reaction, its kinetics can be fitted to a mechanism where the initial electron transfer from Cr(III) to the Ag(II) is the rate determining step.

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Published date: 1990
Additional Information: CV966

Identifiers

Local EPrints ID: 179285
URI: https://eprints.soton.ac.uk/id/eprint/179285
ISSN: 1572-6657
PURE UUID: 1b62d537-478d-46ff-9a9e-d2313b434723
ORCID for G. Denuault: ORCID iD orcid.org/0000-0002-8630-9492

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Date deposited: 06 Apr 2011 08:43
Last modified: 06 Jun 2018 13:10

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Contributors

Author: G. Denuault ORCID iD
Author: M. Fleischmann
Author: D. Pletcher

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