Mirceski, Valentin and Gulaboski, Rubin (2003) A Theoretical and Experimental Study of a Two-step Quasireversible Surface Redox Reaction by Square-wave Voltammetry. Croatica Chemica Acta, 76 (1). pp. 37-48. ISSN 0011-1643
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Abstract
An extended theoretical treatment of a two-step surface redox reaction under the conditions of
square-wave voltammetry (SWV) is presented. The theoretical model is applicable to any reversibility
of both redox steps of the EE reaction. The integral equations representing this theoretical
model were solved numerically. The apparent reversibility of the redox steps depends on
two dimensionless kinetic parameters, �1 and �2, defined as �1 = ks,1/f and �2 = ks,2/f, where ks,1
and ks,2 are the standard rate constants of the first and second redox steps, respectively, and f is
the excitation signal frequency. The response consists of either a single or two separate SW
peaks, depending mainly on the difference between the formal potentials of the first and second
redox steps as well as on the ratio of the kinetic parameters �1/�2. The effect of the electron
transfer coefficients of both redox steps is also discussed. A part of the theoretical results
are qualitatively illustrated by SW voltamograms of the azo-dye Sudan-III.
| Item Type: | Article |
|---|---|
| Subjects: | Natural sciences > Chemical sciences Natural sciences > Matematics Natural sciences > Physical sciences |
| Divisions: | Faculty of Agriculture |
| Depositing User: | Rubin Gulaboski |
| Date Deposited: | 31 Oct 2012 23:09 |
| Last Modified: | 31 Oct 2012 23:09 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/207 |
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