Imidazolium-based ionic liquid derivatives for application in electrochromic devices
Imidazolium-based ionic liquid derivatives for application in electrochromic devices
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DOI：
10.1016/j.solmat.2007.01.023
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发表时间：
2008-02
影响因子：
6.9
通讯作者：
A. Vuk;V. Jovanovski;A. Pollet-Villard;I. Jerman;B. Orel
中科院分区：
文献类型：
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作者：
A. Vuk;V. Jovanovski;A. Pollet-Villard;I. Jerman;B. Orel
以溶胶-凝胶前驱体1-[3-（三甲氧基-λ4-硅基）丙基]咪唑为原料，加入三氟乙酸或乙酸制备了新型质子导电电解质。三甲氧基硅氧基的存在使硅氧烷的溶剂分解和缩合反应成为可能。红外光谱分析表明，三氟乙酸制备的电解质中形成了更多的立方体样物质，而乙酸制备的电解质中存在立方体和阶梯状的硅氧烷。29si核磁共振分析独立证实了这一定位，揭示了三硅氧烷键的t3信号。红外光谱也指出了后一种电解质中氢键的形成，因为在1710、1409和1272cm−1处观察到的波段频率与乙酸的频率接近。相比之下，在1662、1204和1130cm−1处的IR波段证实了三氟乙酸制备电解质的情况下存在三氟乙酸阴离子。与醋酸（1.6×10−5S/cm）相比，游离三氟乙酸阴离子的存在导致该电解质的比电导率（4.6×10−5S/cm）较高。电解质的比电导率可以通过添加锂盐进一步提高。所有电解质均用于具有光学活性的wo3和各种无机反电极（CeVO4, V2O5, Ti/V-oxide）的电致变色器件。光透过率从30%变化到40%。
Novel proton-conducting electrolytes were prepared from the sol–gel precursor 1-[3-(trimethoxy-λ4-silyl)propyl]imidazole with the addition of either trifluoroacetic or acetic acid. The presence of trimethoxysilyl groups enabled the solvolysis and condensation reactions of silsesquioxane species. IR spectroscopy revealed that more cube-like species formed in the electrolyte prepared from trifluoroacetic acid, while cube- and ladder-like silsesquioxanes were present in the electrolyte with acetic acid. This assignation was independently confirmed by29Si NMR analyses revealing the T3signals of trisiloxane bonding. IR spectroscopy also pointed to the formation of hydrogen bonding in the latter electrolyte, since the frequencies of the observed bands at 1710, 1409, and 1272cm−1approached those of acetic acid. In contrast, the IR bands at 1662, 1204, and 1130cm−1confirmed the existence of trifluoroacetate anions in the case when the electrolyte was prepared from trifluoroacetic acid. The presence of free trifluoroacetate anions contributed to the moderately higher specific conductivity of this electrolyte (4.6×10−5S/cm) compared to that of acetic acid (1.6×10−5S/cm). The specific conductivity of the electrolytes could be further increased by the addition of a lithium salt. All electrolytes were employed in electrochromic devices with optically active WO3and various inorganic counter-electrodes (CeVO4, V2O5, Ti/V-oxide). Photopic transmittance changes from 30% to 40% were achieved.