New aspects of the electroadsorption of ethyl xanthate on copper electrodes

PAULA CAROLINA GREZ MORENO, Carlos Celedón, Aurora Molinari, Alfonso Oliva, Marco Orellana, Ricardo Schrebler, Rodrigo Del Río, Ricardo Córdova

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4 Scopus citations

Abstract

The interaction of the ethyl xanthate (EX) anion with a copper electrode in a borate buffer solution, pH 9.2, has been investigated by cyclic voltammetry (CV), electrochemical quartz crystal microbalance (EQCM), electrochemical impedance spectroscopy (EIS), and measurements of contact angle (CA) under controlled potential. The results obtained allow establishing that, in the potential range from -0.80 and -0.60 V, two parallel reactions were characterized. These reactions were the ethyl xanthate electroadsorption and the hydrogen evolution reaction (HER). This last reaction has not been described by previous authors. Besides, the EIS measurements show that the mechanism of the HER on copper electrodes is not affected by the presence of a ethyl xanthate species. The EQCM study shows that in the electrodesorption process the departure of each ethyl xanthate species from the copper electrode is accompanied with the simultaneous entry of four to five water molecules. This fact is in accordance with the number of copper atoms involved in the adsorption of one ethyl xanthate species.

Original languageEnglish
Pages (from-to)22920-22927
Number of pages8
JournalJournal of Physical Chemistry B
Volume109
Issue number48
DOIs
StatePublished - 8 Dec 2005
Externally publishedYes

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