Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 35, Issue -, Pages 5-7Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2013.07.023
Keywords
Ionic liquid; Impedance spectroscopy; Double layer capacitance
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Funding
- Estonian Science Foundation [7791, 8357]
- Estonian Energy Technology Program [SLOKT10209T]
- Estonian Basic Research [SF0180002s08]
- Estonian Centers of Excellence in Science (High-technology Materials for Sustainable Development) [TK117]
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The electrochemical characteristics of the interface between Bi(111) and the mixture of 1-ethyl-3-methylimidazolium tetrafluoroborate and 1-ethyl-3-methylimidazolium iodide were electrochemically characterized by using cyclic voltammetry and electrochemical impedance spectroscopy. The region of ideal polarizability, the formation/rearrangement kinetics of the electrical double layer, the values of series and parallel capacitance and the adsorption kinetics of ions depend on the addition of EMIml in the mixture. Based on the experimental data, it was found that the region of ideal polarizability of Bi(111) single crystal electrode in the mixture under study is comparable to the values measured in pure ionic liquids. Capacitance depends strongly on AC frequency and electrode potential, increasing considerably at E > -0.7 V vs. Ag|AgCI, where the specific adsorption of iodide ions with partial charge transfer from ions to electrode surface and vice versa occurs. (C) 2013 Elsevier B.V. All rights reserved.
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