Electrochemical impedance spectroscopy analysis of chalcopyrite CuFeS2 electrodes

Velásquez P.; Gómez H.; Leinen, D; Ramos-Barrado, J. R.

Keywords: copper, oxidation, redox, spectroscopy, resistance, reduction, degradation, electrode, conductivity, impedance, capacitance, electrodes, chalcopyrite, paper, drug, circuits, charge, analysis, compounds, saturated, priority, journal, Electrochemical, reactions, conference, potential, Transfer, Electric, unclassified, Equivalent, calomel

Abstract

A chalcopyrite CuFeS2 electrode obtained from the 'El Teniente' mine has been studied by Electrochemical Impedance Spectroscopy (EIS) in an alkaline solution for different oxidation potentials. The experimental results can be interpreted from a Randles equivalent circuit, V(dc)<0.4 V vs. saturated calomel electrode (SCE), and a surface layer model for V(dc)>0.4 V vs. SCE. From these results, the variation with the d.c. applied potentials of charge transfer electrical resistance of the redox reaction, the double layer capacitance and other characteristic parameters are considered. A chalcopyrite CuFeS2 electrode obtained from the `El Teniente' mine has been studied by Electrochemical Impedance Spectroscopy (ELS) in an alkaline solution for different oxidation potentials. The experimental results can be interpreted from a Randles equivalent circuit, Vdc<0.4 V vs. saturated calomel electrode (SCE), and a surface layer model for Vdc>0.4 V vs. SCE. From these results, the variation with the d.c. applied potentials of charge transfer electrical resistance of the redox reaction, the double layer capacitance and other characteristic parameters are considered.

Más información

Título de la Revista: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volumen: 140
Número: 1-3
Editorial: Elsevier
Fecha de publicación: 1998
Página de inicio: 177
Página final: 182
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-0032582157&partnerID=q2rCbXpz