Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 826, Issue -, Pages 125-132Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2018.08.024
Keywords
Square-wave voltammetry; Simulation; Coupled chemical reactions; Catalysis; Mathematical model
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Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnologicas (CONICET)
- Fondo para la Investigacion Cientifica y Tecnologica (FONCYT) [PICT 2014-3131]
- Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba (SECyT-UNC)
- CONICET
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The sensitivity of a catalytic adsorptive stripping voltammetric method depends mainly on the strength of adsorption of the electroactive reactant and the efficiency of the catalytic reaction. While the strength of adsorption is associated with the type of reagent and the solution pH, the efficiency of the catalytic step depends on the type and concentration of the oxidant selected for such reaction. Although the probe-and-error approach is commonly used for optimizing a given analytical signal, information about the reaction scheme and some good estimation about the rate constants of involved reactions would help a lot to optimize the analytical system. The possibility for using the quasi-reversible maximum to study the electrode kinetics depends on the values of k(cat), K-ad, f, E-sw, and of course k(s). As a result of this, it is rather difficult for experimentalist and also for theoreticians to organize a strategy for detecting and understanding the effect of each variable separately. In this manuscript, it is first shown the effect of different variables on the voltammetric response, and then it is suggested a strategy for studying and estimating the values of those variables. Thus, if the experimental system matches the reaction scheme of an electrochemical reaction complicated by following homogeneous catalytic reaction, then it is advisable to follow a set of simple experimental steps to characterize the kinetic constants of the system.
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