Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 730, Issue -, Pages 59-64Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2014.07.035
Keywords
Ionic liquid; Impedance spectroscopy; Double layer capacitance
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Funding
- Estonian Science Foundation [7791, 8357, 8786]
- Estonian Energy Technology Program Project [SLOKT10209T]
- Estonian Institutional Research Project [IUT20-13]
- Estonian Centers of Excellence in Science Project: High-Technology Materials for Sustainable Development [TK117]
- European Social Fund in Estonia [1.2.0401.09-0079]
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The electrochemical behavior and characteristics of the interface between Bi(111) and 1-ethyl-3-methylimidazolium iodide solution in 1-ethyl-3-methylimidazolium tetrafluoroborate with variable concentrations were investigated by using cyclic voltammetry and electrochemical impedance spectroscopy. The shape of the complex impedance plane plots, the values of the phase angle and capacitance depend strongly on the concentration of EMImI in the mixture of ionic liquids, on ac frequency and on the electrode potential applied. The capacitance values increase considerably at potentials higher than -0.6 V vs. Ag vertical bar AgCl vertical bar mixture of RTIL, were the specific adsorption of iodide ions takes place. Comparison of the data for the Bi(111) electrode and the highly oriented pyrolytic graphite C(0001) shows that the chemical nature and the crystallographic structure of an electrode significantly influence the specific adsorption of the halide ions. The non-linear least squares fitting method has been applied for calculation of equivalent circuit parameters for Bi(111)vertical bar mixture of RTIL interface. (C) 2014 Published by Elsevier B.V.
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