Abstract
In this study 1-dodecyl-3-methylimidazolium bis(pentafluoroethylsulfonyl)imide (BETI) and 1-dodecylimidazolium BETI hydrophobic room-temperature ionic liquids (RTILs) were synthesized and used as proton-conducting electrolytes in a nonhumidified feed gas electrochemical cell. The ionic conductivities of and were similar and increased linearly with an increase in temperature from . However, when used in the electrochemical system the protic water-equilibrated had a larger maximum current and power density compared to the aprotic water-equilibrated . The effect of water content on the reaction rates and thermodynamics of these hydrophobic RTILs was also examined. The efficiency of the increased upon removal of water while that of the decreased in efficiency when water was removed. The water structure in these RTILs was examined using attenuated total internal reflection Fourier transform IR spectroscopy and depended on the chemical structure of the cation. These studies give further insight into the possible mechanism of proton transport in these RTIL systems.
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