Journal article
Direct Determination of the Transfer Coefficient from Cyclic Voltammetry: Isopoints as Diagnostics
Analytical chemistry (Washington), Vol.67(10), pp.1661-1668
05/01/1995
DOI: 10.1021/ac00106a003
Abstract
Isopoints are observed when cyclic voltammograms recorded at several scan rates are all plotted on the same potential axis. The isopoint is the point where all curves intersect Here, isopoints are used as a diagnostic under reversible and quasireversible electron transfer conditions. A method is presented for determining the transfer coefficient, α, using only the isopoint potential, switching potential, and peak potentials, all readily identifiable points on the voltammograms. It is not necessary to know the diffusion coefficients, standard rate constant, standard potential, electrode area, or solution concentration to apply this method. The isopoint method is applicable for differences in peak potentials of 0.073-0.145 V. The method is verified experimentally by comparing the values of α determined by the isopoint and convolution methods. A linearization of the dimensionless kinetic parameter, Ψ, developed by Nicholson, with the difference in peak potentials is presented. It is also shown that the average of the peak potentials yields the half-wave potential within 1 mV for differences in the peak potential of less than approximately 0.145 V. All models were developed by computer simulation (Digisim). © 1995, American Chemical Society. All rights reserved.
Details
- Title: Subtitle
- Direct Determination of the Transfer Coefficient from Cyclic Voltammetry: Isopoints as Diagnostics
- Creators
- Hillary Jade PaulJohna Leddy
- Resource Type
- Journal article
- Publication Details
- Analytical chemistry (Washington), Vol.67(10), pp.1661-1668
- Publisher
- American Chemical Society
- DOI
- 10.1021/ac00106a003
- ISSN
- 0003-2700
- eISSN
- 1520-6882
- Language
- English
- Date published
- 05/01/1995
- Academic Unit
- Chemistry
- Record Identifier
- 9984216566002771
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