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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2010, Volume 61, Issue 6,





Cristian Pirvu, Maria Marcu, Alexandra Banu
Deactivation of Gold Electrode at Chlorophenols Electrooxidation

Abstract:

Electrochemical impedance spectroscopy (EIS) was used as the main technique coupled with cycling voltammetry (CV) to characterize the surface fouling of a conventional gold electrode in chlorophenol aqueous solutions caused by the electropolymerization of chlorinated phenol on the electrode surface. Different chlorophenols show differences in the voltammetric responses and deactivation due to fouling process, depending on number of the chloro substituents on the aromatic ring. Results showed that the fouling extent at gold electrode present the following order 2 CP ] 2,4,5 TCP ] 2,4 DCP. In order to characterize the interface between Au electrode and solution before and after polymerization, the Mott Sckhotky technique was used. According to the Mott Schottky equation, positive slope of C-2 vs. potential plots suggest an n-type semiconductor behaviour for polymeric films. Keywords: chlorophenol electrooxidation, gold electrode, EIS, differential capacitance


Issue: 2010, Volume 61, Issue 6
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