Direct determination of diffusion coefficients by chronoamperometry at microdisk electrodes


Denuault, Guy, Mirkin, Michael V. and Bard, Allen J. (1991) Direct determination of diffusion coefficients by chronoamperometry at microdisk electrodes. Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 308, (1-2), 27-38. (doi:10.1016/0022-0728(91)85056-U).

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Description/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.

Item Type: Article
Additional Information: FV724
ISSNs: 0022-0728 (print)
Subjects: Q Science > QD Chemistry
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: University Structure - Pre August 2011 > School of Chemistry
Faculty of Natural and Environmental Sciences > Chemistry > Electrochemistry
ePrint ID: 179279
Date Deposited: 31 Mar 2011 13:58
Last Modified: 27 Mar 2014 19:32
URI: http://eprints.soton.ac.uk/id/eprint/179279

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