A Theoretical and Experimental Study of a Two-step Quasireversible Surface Redox Reaction by Square-wave Voltammetry

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: http://eprints.ugd.edu.mk/id/eprint/207

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