Electrochemical characterization of screen-printed and conventional carbon paste electrodes
2007; Elsevier BV; Volume: 53; Issue: 10 Linguagem: Inglês
10.1016/j.electacta.2007.12.044
ISSN1873-3859
AutoresPablo Fanjul‐Bolado, David Hernández‐Santos, Pedro José Lamas‐Ardisana, A.M. Pernía, Agustín Costa‐García,
Tópico(s)Conducting polymers and applications
ResumoThis 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.
Referência(s)