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Title: Characterization for EIS of a modified graphite electrode in a hexane/CTAB-(CTA)4[Fe(CN)6]-butanol/water microemultion
Author: Carreon-Gutierrez, C.A.
Estrada-Vargas, A.
Barcena-Soto, M.
Casillas, N.
Issue Date: 2009
Abstract: This work describes an electrochemical impedance spectroscopy (EIS) study of the hexane/CTAB-(CTA)4[Fe(CN)6]-butanol/water system in contact with a graphite electrode before and after being modified with an adsorbed surfactant layer in contact with an electroactive molecule. Six plausible equivalent circuits are tested in order to fit impedance experimental data for the unmodified electrode. Once an adsorbed surfactant layer is chemically attached to the graphite surface its electrochemical response changes. This type of modified graphite electrodes are tested in a Fe(CN) 6 3- standard solution using EIS. A series of three plausible equivalent circuits are casted to fit the experimental impedance data. The proposed models include diffusion of electroactive species through an adsorbed surfactant layer on the electrode surface. For all the equivalent circuits investigated a low χ2 fitting error and percentage of error determined from Kramers-Kronig plots are reported. Final proposals of an equivalent circuit to describe the unmodified and modified graphite electrode interface are presented. ©The Electrochemical Society.
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