Electrochemical characterization of screen-printed and conventional carbon paste electrodes |
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Authors: | Pablo Fanjul-Bolado Pedro José Lamas-Ardisana Agustín Costa-García |
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Affiliation: | a Departamento de Química Física y Analítica, Universidad de Oviedo, 33006 Oviedo, Asturias, Spain b Departamento de Ingeniería Eléctrica, Electrónica de Computadores y Sistemas, Universidad de Oviedo, 33204 Gijón, Asturias, Spain |
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Abstract: | This work compares the electroactivity of a conventional carbon paste electrode and non-pretreated commercially available screen-printed carbon electrodes (from Alderon Biosciences, University of Florence and DropSens) towards some benchmark redox couples like hexaammineruthenium (III), ferricyanide, p-aminophenol and hydroquinone. While cyclic voltammograms of Ru3+ did not show significative electron transfer reactivity differences between the electrodes tested, the other redox systems exhibited higher reversible behaviours on DropSens electrodes. Scanning electron microscopy and roughness analysis with a profilometer were applied to detect the surface morphology of the working electrodes. The roughness evaluated of the screen-printed carbon working electrodes increased in this order Alderon < University of Florence < DropSens. Finally, the most electrochemically active and rough unpretreated electrode (DropSens commercial screen-printed electrode) was used to study the electrochemical-chemical reaction mechanism of indigo carmine oxidation in 0.1 M sulphuric acid. This study showed that the adsorption of the oxidation product of indigo carmine is stabilized when it is adsorbed on the surface of the electrode. |
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Keywords: | Carbon paste electrode Screen-printed electrode Electrochemical detection |
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