Physical and electrochemical properties of low-viscosity phosphonium ionic liquids as potential electrolytes |
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| Institution: | 1. ARC Centre of Excellence for Electromaterials Science, IFM-Institute for Frontier Materials, Deakin University, 221 Burwood Hwy, Burwood, Victoria 3125, Australia;2. Ecole de Chimie, Polymères, et Matériaux de Strasbourg, Université de Strasbourg, 25, Rue Becquerel, 67087 Strasbourg, France;3. IFM-Institute for Frontier Materials, Deakin University, 75 Pigdons Rd, Waurn Ponds, Victoria 3216, Australia;4. ARC Centre of Excellence for Electromaterials Science, Monash University, Clayton, Victoria 3800, Australia |
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| Abstract: | 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 °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 °C, showing slower gravimetric decreases at high temperature compared to those of the corresponding ammonium ionic liquids. |
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