Electrochemical impedance spectroscopy analysis of chalcopyrite CuFeS<sub>2</sub> electrodes期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Electrochemical impedance spectroscopy analysis of chalcopyrite CuFeS₂ electrodes

Authors:	P Velsquez H Gmez D Leinen J R Ramos-Barrado

Institution:	^a Instituto de Químicó, Universidad Católica de Valparaiso, Casilla 4059, Valparaiso, Chile ^b Departemento de Física Aplicada, Facultad de Ciencias, Universidad de Málaga, E-29071 Málaga, Spain

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.

Keywords:	Electrochemical Impedance Spectroscopy (EIS) Chalcopyrite CuFeS₂ Electrode
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