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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Electrochemical study of the tarnish layer of silver deposited on glass
Electrochimica Acta, Volume 131, Year 2014
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Description
Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to characterize the tarnished thin layer of silver deposited on glass. Instead of natural tarnishing in air environment, an acceleration of tarnishing process was realized by immersion of Ag covered glass in 10 μM K 2S medium. The X-ray photoelectron spectroscopy (XPS) shows that tarnishing product formed on the silver surface consisted of Ag2S and Ag2O. As electrochemical characterization, the measurements were carried out in aerated 0.5 M Na2SO4 solution adjusted at pH 10. The impedance spectra collected in sulphate medium at the open-circuit potential show one capacitive loop in parallel with a high resistance, which reflects a blocking electrode behaviour. However, the equivalent electrical circuit, Rs-(CPE//R) is insufficient to reproduce the experimental results correctly. To minimize the dispersion between the experimental and fitted data, the CPE contribution is replaced by two normal power-law distributions of the local resistivity to interpret the tarnishing process in K2S medium with respect to the immersion time. These distributions are associated with the Ag2S and Ag2O layers. © 2014 Published by Elsevier Ltd.
Authors & Co-Authors
Ben Amor, Yasser
France, Paris
Cnrs Centre National de la Recherche Scientifique
France, Paris
Sorbonne Université
Tunisia, Hamam Lif
Institut Supérieur Des Sciences et Technologies de L'environnement de Borj Cédria
Sutter, Éliane M.M.
France, Paris
Cnrs Centre National de la Recherche Scientifique
France, Paris
Sorbonne Université
Takenouti, Hisasi
France, Paris
Cnrs Centre National de la Recherche Scientifique
France, Paris
Sorbonne Université
Tribollet, Bernard
France, Paris
Cnrs Centre National de la Recherche Scientifique
France, Paris
Sorbonne Université
Boinet, M.
France, La Defense
Saint-gobain
Faure, R.
France, La Defense
Saint-gobain
Balencie, J.
France, La Defense
Saint-gobain
Durieu, G.
France, La Defense
Saint-gobain
Statistics
Citations: 29
Authors: 8
Affiliations: 4
Identifiers
Doi:
10.1016/j.electacta.2013.12.011
ISSN:
00134686
Research Areas
Environmental