Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 18, Issue -, Pages 116-118Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2012.02.040
Keywords
Reference electrode; Ionic liquid; Ferrocene; Activated carbon
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Commonly used reference electrodes in ionic liquids are either Ag and Pt wires or even newly developed systems of second order mainly based on the Ag/Ag+ couple. However, the reference potentials may change while changing the ionic liquid and a universal reference scale has not been found yet. In this publication we report on the performance of activated carbon (AC) as quasi-reference electrode for the use in pure ionic liquid (IL) electrolytes. Ferrocene was used as a redox couple in the ionic liquids [EMIM][BF4], [EMIM][TFSI], [EMIM][FAP] and [Pyr(13)][TFSI]. It is shown that all of them exhibit a half-wave potential of 190 mV +/- 10 mV indicating that AC may be a good candidate as a quasi-reference in IL (C) 2012 Elsevier B.V. All rights reserved.
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