Journal
ELECTROCHIMICA ACTA
Volume 89, Issue -, Pages 807-813Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.10.085
Keywords
Supercapacitive property; Two-cation salt; Activated carbon electrode; Cyclic voltammetry; Impedance spectroscopy
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Funding
- Cooperative RD Program [B551179-10-01-00]
- Korea Research Council Industrial Science and Technology in Korea
- Dongguk University-Seoul Research Fund
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A series of novel room-temperature ionic liquid (RTIL) salts based on Cn(MIm)(i)A and C-n(TMA)(i)A (i = 1, 2 as single- and double-cation form, respectively; n = 4, 5,6; A = BF4-, TFSI-), where MIm, TMA, and TFSI indicate 3-methylimidazolium, trimethylammonium, and bis(trifluoromethanesulfonyl)imide, respectively, are synthesized varying the number of alkyl chains, e.g., butane (n=4), pentane (n=5), and hexane (n = 6) in the main backbone. Ionic conductivities of each RTIL salt are measured after dissolving with propylene carbonate (PC) or acetonitrile (ACN) at the salt concentration of 0.5 M. A supercapacitor containing activated carbon as an active material in the organic electrolyte containing ionic liquid salts is fabricated to evaluate the supercapacitive properties using cyclic voltammetry. It is found that the effects of counter-anions (BE4- and TFSI-) and the number of cations (single- and double-cation) in RTIL salts on the supercapacitive property are of importance in determining their potential applications for energy storage devices. (C) 2012 Elsevier Ltd. All rights reserved.
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