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New aspects of the electroadsorption of ethyl xanthate on copper electrodes.

Authors
  • Grez, Paula
  • Celedón, Carlos
  • Molinari, Aurora
  • Oliva, Alfonso
  • Orellana, Marco
  • Schrebler, Ricardo
  • del Río, Rodrigo
  • Córdova, Ricardo
Type
Published Article
Journal
The Journal of Physical Chemistry B
Publisher
American Chemical Society
Publication Date
Dec 08, 2005
Volume
109
Issue
48
Pages
22920–22927
Identifiers
PMID: 16853986
Source
Medline
License
Unknown

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.

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