Advanced analysis for electrode kinetic studies of surface reactions by applying square-wave voltammetry

A novel methodology for electrode kinetic studies is proposed by altering either the amplitude, ESW, or the frequency, f, of a Square wave voltammetry (SWV) experiment. The apparent standard rate constant, k0, of a surface electrode reaction can be easily determined by using a relationship between t...

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Autor principal:	Bonazzola, Cecilia
Publicado:	2016
Materias:	Square-wave Amplitude Square-wave voltammetry Standard rate constant Surface confined electrode reaction Electrodes Kinetic theory Kinetics Rate constants Separation Surface reactions Electrochemical reactions Electrode kinetics Electrode reactions Square wave voltammetry Square waves Surface electrode reactions Transfer coefficient Voltammetry
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v213_n_p613_Bonazzola http://hdl.handle.net/20.500.12110/paper_00134686_v213_n_p613_Bonazzola
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00134686_v213_n_p613_Bonazzola
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spelling	paper:paper_00134686_v213_n_p613_Bonazzola2023-06-08T14:35:48Z Advanced analysis for electrode kinetic studies of surface reactions by applying square-wave voltammetry Bonazzola, Cecilia Square-wave Amplitude Square-wave voltammetry Standard rate constant Surface confined electrode reaction Electrodes Kinetic theory Kinetics Rate constants Separation Surface reactions Electrochemical reactions Electrode kinetics Electrode reactions Square wave voltammetry Square waves Standard rate constant Surface electrode reactions Transfer coefficient Voltammetry A novel methodology for electrode kinetic studies is proposed by altering either the amplitude, ESW, or the frequency, f, of a Square wave voltammetry (SWV) experiment. The apparent standard rate constant, k0, of a surface electrode reaction can be easily determined by using a relationship between the logarithm of the characteristic dimensionless kinetic parameter, k0/2f, and the peak potential separation observed in a SW voltammogram, ΔEP. It is shown that it is possible to relate the function Ωn,α = ln(k0/2f) to the peak separation provided that the number of exchanged electrons, n, and the transfer coefficient, α, involved in the electrochemical reaction are known. Two regions are defined when the dependence of Ωn,α on ESW is analized: the amplitude dependent region, ADR, where │ΔEP│< 0.090 V/n, and the non amplitude dependent region, NAD, for higher │ΔEP│values. A unique function Ωn,α is defined for each one of these regions thus providing an extremely easy way for obtaining the apparent standard surface rate constant. Up to now, the methodology here proposed and the so called “potential-corrected SW voltammograms” method, constitute the alternatives for electro kinetic studies based on the measurement of the peak separation generated by SWV. © 2016 Fil:Bonazzola, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v213_n_p613_Bonazzola http://hdl.handle.net/20.500.12110/paper_00134686_v213_n_p613_Bonazzola
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Square-wave Amplitude Square-wave voltammetry Standard rate constant Surface confined electrode reaction Electrodes Kinetic theory Kinetics Rate constants Separation Surface reactions Electrochemical reactions Electrode kinetics Electrode reactions Square wave voltammetry Square waves Standard rate constant Surface electrode reactions Transfer coefficient Voltammetry
spellingShingle	Square-wave Amplitude Square-wave voltammetry Standard rate constant Surface confined electrode reaction Electrodes Kinetic theory Kinetics Rate constants Separation Surface reactions Electrochemical reactions Electrode kinetics Electrode reactions Square wave voltammetry Square waves Standard rate constant Surface electrode reactions Transfer coefficient Voltammetry Bonazzola, Cecilia Advanced analysis for electrode kinetic studies of surface reactions by applying square-wave voltammetry
topic_facet	Square-wave Amplitude Square-wave voltammetry Standard rate constant Surface confined electrode reaction Electrodes Kinetic theory Kinetics Rate constants Separation Surface reactions Electrochemical reactions Electrode kinetics Electrode reactions Square wave voltammetry Square waves Standard rate constant Surface electrode reactions Transfer coefficient Voltammetry
description	A novel methodology for electrode kinetic studies is proposed by altering either the amplitude, ESW, or the frequency, f, of a Square wave voltammetry (SWV) experiment. The apparent standard rate constant, k0, of a surface electrode reaction can be easily determined by using a relationship between the logarithm of the characteristic dimensionless kinetic parameter, k0/2f, and the peak potential separation observed in a SW voltammogram, ΔEP. It is shown that it is possible to relate the function Ωn,α = ln(k0/2f) to the peak separation provided that the number of exchanged electrons, n, and the transfer coefficient, α, involved in the electrochemical reaction are known. Two regions are defined when the dependence of Ωn,α on ESW is analized: the amplitude dependent region, ADR, where │ΔEP│< 0.090 V/n, and the non amplitude dependent region, NAD, for higher │ΔEP│values. A unique function Ωn,α is defined for each one of these regions thus providing an extremely easy way for obtaining the apparent standard surface rate constant. Up to now, the methodology here proposed and the so called “potential-corrected SW voltammograms” method, constitute the alternatives for electro kinetic studies based on the measurement of the peak separation generated by SWV. © 2016
author	Bonazzola, Cecilia
author_facet	Bonazzola, Cecilia
author_sort	Bonazzola, Cecilia
title	Advanced analysis for electrode kinetic studies of surface reactions by applying square-wave voltammetry
title_short	Advanced analysis for electrode kinetic studies of surface reactions by applying square-wave voltammetry
title_full	Advanced analysis for electrode kinetic studies of surface reactions by applying square-wave voltammetry
title_fullStr	Advanced analysis for electrode kinetic studies of surface reactions by applying square-wave voltammetry
title_full_unstemmed	Advanced analysis for electrode kinetic studies of surface reactions by applying square-wave voltammetry
title_sort	advanced analysis for electrode kinetic studies of surface reactions by applying square-wave voltammetry
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v213_n_p613_Bonazzola http://hdl.handle.net/20.500.12110/paper_00134686_v213_n_p613_Bonazzola
work_keys_str_mv	AT bonazzolacecilia advancedanalysisforelectrodekineticstudiesofsurfacereactionsbyapplyingsquarewavevoltammetry
_version_	1768544622322122752

Advanced analysis for electrode kinetic studies of surface reactions by applying square-wave voltammetry

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