Direct determination of diffusion coefficients by chronoamperometry at microdisk electrodes
Direct determination of diffusion coefficients by chronoamperometry at microdisk electrodes
The chronoamperometric response at a microdisk is used for the direct determination of the diffusion coefficient of an electroactive species. The method does not require knowledge of the bulk concentration and the number of electrons participating in the electrode reaction, and requires only a value for the disk radius. Subsequent determination of the number of electrons (n) for an electrode reaction or the concentration of electroactive species is also possible. This approach is demonstrated with the evaluation of the diffusion coefficient of Fe(CN)6(4-) in KCl and that of borohydride ion in NaOH. In both cases, the values of n found remained constant over a wide time range and correspond to those expected for these processes.
27-38
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Mirkin, Michael V.
c972305c-d717-469a-b4fc-98aa8bba284a
Bard, Allen J.
90fc8cae-46e8-4190-bc21-4031ad75cc33
25 June 1991
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Mirkin, Michael V.
c972305c-d717-469a-b4fc-98aa8bba284a
Bard, Allen J.
90fc8cae-46e8-4190-bc21-4031ad75cc33
Denuault, Guy, Mirkin, Michael V. and Bard, Allen J.
(1991)
Direct determination of diffusion coefficients by chronoamperometry at microdisk electrodes.
Journal of Electroanalytical Chemistry, 308 (1-2), .
(doi:10.1016/0022-0728(91)85056-U).
Abstract
The chronoamperometric response at a microdisk is used for the direct determination of the diffusion coefficient of an electroactive species. The method does not require knowledge of the bulk concentration and the number of electrons participating in the electrode reaction, and requires only a value for the disk radius. Subsequent determination of the number of electrons (n) for an electrode reaction or the concentration of electroactive species is also possible. This approach is demonstrated with the evaluation of the diffusion coefficient of Fe(CN)6(4-) in KCl and that of borohydride ion in NaOH. In both cases, the values of n found remained constant over a wide time range and correspond to those expected for these processes.
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Published date: 25 June 1991
Additional Information:
FV724
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Local EPrints ID: 179279
URI: http://eprints.soton.ac.uk/id/eprint/179279
ISSN: 1572-6657
PURE UUID: 16b5867c-7525-4f6d-90b9-aa278ed2ecec
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Date deposited: 31 Mar 2011 13:58
Last modified: 15 Mar 2024 02:44
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Author:
Michael V. Mirkin
Author:
Allen J. Bard
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