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Oscillating Electrochemical Reaction in Copper-Containing Imidazolium Ionic Liquids

Oscillating Electrochemical Reaction in Copper-Containing Imidazolium Ionic Liquids

Stijn Schaltin, Koen Binnemans, Jan Fransaer

Phys Chem Chem Phys. 2011 Sep 14;13(34):15448-54.

PMID: 21808767

Abstract:

An example of an electrochemical oscillator in ionic liquids is presented. Solutions of the ionic liquid 1-ethyl-3-methylimidazolium chloride, [C(2)mim]Cl, which contain both Cu(+) and Cu(2+) 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 Cu(2+), 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-dimethylimidazolium chloride, but not for tributyltetradecylphosphonium chloride and N-butylpyridinium chloride.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP98892752	1-Butyl-2,3-dimethylimidazolium chloride		98892-75-2	Price

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