Title: Oscillating electrochemical reaction in copper-containing imidazolium ionic liquids
Authors: Schaltin, Stijn
Binnemans, Koen
Fransaer, Jan # ×
Issue Date: 2011
Publisher: Royal Society of Chemistry
Series Title: Physical Chemistry Chemical Physics vol:13 issue:34 pages:15448-15454
Abstract: An example of an electrochemical oscillator in ionic liquids is presented. Solutions of the ionic liquid 1-ethyl-3-methylimidazolium chloride, [C2mim]Cl, which contain both Cu+ and Cu2+ ions, show current oscillations during potentiostatic polarization. The oscillations were analyzed by the Quartz Crystal Microbalance (QCM) technique and by Electrochemical Impedance Spectroscopy (EIS). The electrochemical oscillations are of the N-NDR-type, because the low frequency end of the impedance spectrum has negative real impedances. The oscillating current leads to an oscillating growth speed of a metallic copper layer. Besides the presence of both Cu+ and Cu2+, the presence of chloride is a necessary, yet not a sufficient, condition for the occurrence of current oscillations. Oscillating currents were also observed for the ionic liquids 1-butyl-3-methylimidazolium chloride and 1-butyl-2,3-dimethyl-imidazolium chloride, but not for tributyltetradecyl-phosphonium chloride and N-butylpyridinium chloride.
ISSN: 1463-9076
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Design and Synthesis
Department of Materials Engineering - miscellaneous
Chemical and Extractive Metallurgy Section (-)
× corresponding author
# (joint) last author

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