Publication: Effects of unequal diffusion coefficients and coupled chemical equilibria on square wave voltammetry at disc and hemispherical microelectrodes
Authors
Olmos Martínez, José Manuel ; Molina Gómez, María de los Ángeles ; Laborda Ochando, Eduardo ; Martínez-Ortíz, Francisco Asís
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Publisher
Elsevier
International Society of Electrochemistry (ISE)
International Society of Electrochemistry (ISE)
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DOI
https://doi.org/10.1016/j.electacta.2015.07.048
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info:eu-repo/semantics/article
Description
©<2015>. This manuscript version is made available under the CC-BY-NC 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This document is the, Accepted, version of a Published Work that appeared in final form in Electrochimica Acta. To access the final edited and published work see: https://doi.org/10.1016/j.electacta.2015.07.048
Abstract
Square wave voltammetry (SWV) at disc and hemispherical microelectrodes is studied when the electroactive species show different diffusivities and/or take part in chemical equilibria in solution, under both transient and steady state conditions. Despite the use of microelectrodes, experiments in pulse techniques such as SWV frequently correspond to transient conditions since the pulse duration are typically very short (<100ms, f>5Hz). As will be shown, under such conditions the case of unequal diffusion coefficients gives rise to a complex behaviour of the SWV peak, the features of which deviate from the theory and criteria already established under the assumption of equal diffusion coefficients. Also, the theoretical treatment is notably more difficult and no
analytical solution has been deduced for multipulse techniques.The effects of coupled chemical equilibria and, particularly, of unequal diffusion coefficients on SWV will be described in depth as a function of the electrode size and shape and they will be compared with those observed in differential double pulse voltammetry (DDPV). The main discrepancies in the peak height, width and position with respect to the case of equal diffusion coefficients will be studied. Also, appropriate methodologies and experimental conditions will be discussed for the determination of, formal potentials and equilibrium constants.
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Citation
Electrochimica Acta.176, pp. 1044 - 1053. 2015
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