一种高效、绿色制备环状硫碘盐的新方法及其在染料敏化太阳电池中的应用

摘要

High productivity and purity alkyl cyclic sulfonium iodides were prepared by using autoclave and water/ethyl acetate system. Autoclave synthesis took shorter time (about 1/3 of traditional method)guaranteeing against productivity decline, and the extraction with water/ethyl acetate system took shorter purifying time as well as avoiding the use of poisoned organic solvents. These alkyl cyclic sulfonium iodides were used as iodide source to prepare electrolytes for dye-sensitized solar cell (DSC). The efficiency of corresponding DSC based on these sulfonium iodides was near to that based on imidazole iodide. The result of electrochemical impedance spectra showed that the sulfonium cation could inhibit the back reaction within DSC and be benefit for electron exchange reaction on counter electrode compared with imidazole cation,resulting in higher open voltage and better fill factor.%采用高压釜合成和乙酸乙酯/水萃取提纯的模式制备出高产率、高纯度的环状烷基硫碘盐.高压釜合成在保证产率的前提下,大大缩短了反应时间(反应时间仅为原来的1/3);乙酸乙酯和水的萃取提纯模式在保证产品纯度的同时,大大缩短了提纯时间,还避免了有毒试剂的使用.制备出的烷基环状硫碘盐作为碘源用于配制染料敏化太阳电池用电解质,相应电池的光电转化效率接近使用传统烷基咪唑碘盐的电池.电化学阻抗谱(EIS)测试表明环状烷基锍阳离子相比于烷基咪唑阳离子来说,更有利于抑制电池内部的电子复合反应,同时还能促进对电极上电子交换反应的进行,最终可以提高电池的开路电压和填充因子.