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10.1016/j.jelechem.2019.113549
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Título: | Influence of Intermolecular Interactions in the Redox Kinetics Performance of Surface Confined Probes by Square Wave Voltammetry |
Fecha de publicación: | oct-2019 |
Cita bibliográfica: | Journal of Electroanalytical Chemistry, 2019, 854, 113549 |
Materias relacionadas: | CDU::5 - Ciencias puras y naturales CDU::5 - Ciencias puras y naturales::54 - Química::544 - Química física |
Palabras clave: | Square Wave Voltammetry Electroactive Monolayer Electrode kinetics |
Resumen: | Analysis of the Square Wave Voltammetry (SWV) responses of surface confined electroactive probes under finite kinetics conditions, by considering the influence of intermolecular interactions on the current, is presented. This non-ideality gives rise to very significant deviations in the most relevant features of the current potential response as compared with predictions of ideal models. The theoretical model does not require that the dependence of the rate constant with the potential (i. e., Butler-Volmer or Marcus-Hush kinetic formalisms) is explicitly established a priori. Both location and height of the Quasi-Reversible Maximum and symmetry of the SWV current-potential curves are strongly affected by the interaction parameters G=aOO+aRR-2aOR and S=aRR-aOO (with aij being the interaction coefficient for species i and j). Quantitative methods for obtaining kinetic and interaction parameters of the redox probes are presented, based on the measurement of the peak currents and potential under quasi-reversible conditions where the current exhibits two asymmetric peaks. A discussion is done concerning the deviations found in the estimation of the rate constants with SWV when intermolecular interactions are not considered. The above methods have been applied to the characterisation of mixed ferrocenylundecanethiol / decanethiol monolayers on gold electrodes at an ethanolic medium for which the SWV is clearly non-ideal |
Autor/es principal/es: | Gonzalez, Joaquin Sequí Castellano, Jose Alfonso |
Facultad/Departamentos/Servicios: | Facultad de Química |
Versión del editor: | https://www.sciencedirect.com/science/article/pii/S1572665719308173 |
URI: | http://hdl.handle.net/10201/106621 |
DOI: | 10.1016/j.jelechem.2019.113549 |
Tipo de documento: | info:eu-repo/semantics/article |
Número páginas / Extensión: | 37 |
Derechos: | info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional |
Aparece en las colecciones: | Artículos: Química Física |
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Fichero | Descripción | Tamaño | Formato | |
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J Electroanal Chem 854 2019 113549.pdf | 1,09 MB | Adobe PDF | Visualizar/Abrir |
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