In this study 1-dodecyl-3-methylimidazolium (C(12)mim) bis(pentafluoroethylsulfonyl)imide (BETI) and 1-dodecylimidazolium (C(12)im) 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 C(12)mimBETI and C(12)imBETI were similar and increased linearly with an increase in temperature from 20 to 130°C. However, when used in the electrochemical system the protic water-equilibrated C(12)imBETI had a larger maximum current and power density compared to the aprotic water-equilibrated C(12)mimBETI. The effect of water content on the reaction rates and thermodynamics of these hydrophobic RTILs was also examined. The efficiency of the C(12)mimBETI increased upon removal of water while that of the C(12)imBETI 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.

中文翻译：

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疏水性室温离子液体中氢氧化和氧还原的动力学和热力学

在本研究中，合成并使用了 1-dodecyl-3-methylimidazolium (C(12)mim) 双（五氟乙基磺酰基）酰亚胺 (BETI) 和 1-dodecylimidazolium (C(12)im) BETI 疏水性室温离子液体 (RTILs)作为非加湿原料气电化学电池中的质子传导电解质。C(12)mimBETI 和 C(12)imBETI 的离子电导率相似，并且随着温度从 20°C 升高到 130°C 呈线性增加。然而，当在电化学系统中使用时，与非质子水平衡的 C(12)mimBETI 相比，质子水平衡的 C(12)imBETI 具有更大的最大电流和功率密度。还研究了水含量对这些疏水性 RTIL 的反应速率和热力学的影响。C(12)mimBETI 的效率在去除水后增加，而 C(12)imBETI 的效率在去除水时降低。使用衰减全内反射傅立叶变换红外光谱检查这些 RTIL 中的水结构，并取决于阳离子的化学结构。这些研究进一步深入了解了这些 RTIL 系统中质子传输的可能机制。