Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 9, Issue 9, Pages 2353-2358Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2007.07.003
Keywords
ionic liquids; quaternary phosphonium compounds; bis(trifluoromethylsulfonyl)imide anion; potential window; thermal decomposition temperature
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A new group of room temperature ionic liquids based on triethylalkylphosphonium cations together with a bis(trifluoromethylsulfonyl)imide anion as a novel electrolyte is presented in this report. It was found that phosphonium ionic liquids showed lower viscosities and higher conductivities than those of the corresponding ammonium ionic liquids. Particularly, phosphonium ionic liquids containing a methoxy group, triethyl(methoxymethyl)phosphonium bis(trifluoromethylsulfonyl)imide and triethyl(2-methoxyethyl)phosphonium bis(trifluoromethylsulfonyl)imide, exhibited quite low viscosities (35 and 44 mPa s at 25 degrees C, respectively). Linear sweep voltammetry measured in neat phosphonium ionic liquids at a glassy carbon electrode indicated wide potential windows (at least -3.0 to +2.3 V vs. Fc/Fc(+)). Thermogravimetric analysis suggested that phosphonium ionic liquids were thermally stable up to nearly 400 degrees C, showing slower gravimetric decreases at high temperature compared to those of the corresponding ammonium ionic liquids. (c) 2007 Elsevier B.V. All rights reserved.
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