【作者】 陈卓；

【导师】 马廷丽；

【作者基本信息】 大连理工大学 ， 应用化学， 2011， 硕士

【摘要】 离子液体作为21世纪最有希望的绿色溶剂之一,已经应用到了有机化学反应、物质的分离和纯化、电化学等各个领域,其具有不易挥发,稳定温度范围较大,化学稳定性较好,电化学稳窗口较宽,通过对阴阳离子的设计可调节其对无机物、有机物的溶解性等特点。这些性质表明离子液体适合作为染料敏化太阳能电池电解质使用,基于此,我们选择了一系列的二元离子液体,并配制了相应的离子液体电解质测试染料敏化太阳能电池的效率,主要内容包括：1.我们研究了六种用于染料敏化太阳能电池的二元离子液体电解质的光电转化效率,其中1-乙基-3-甲基咪唑四氟硼酸盐/碘化1-丁基-3-甲基咪唑类电解质具有最高的光电转化效率,达到了4.98%。改变其中碘单质的浓度,测量了五种不同碘单质浓度二元离子液体电解质的电化学阻抗谱(EIS)、紫外-可见吸收光谱和入射单色光子-电子转化效率(IPCE),发现随着碘单质浓度的增大,铂-电解质界面的传荷电阻(RCT)和瓦尔堡阻抗(Zw)逐渐减小,而电解质对紫外光的吸收逐渐增大,最后在AM1.5、光强100mW/cm2的条件下测试光电性能,发现当I2的浓度为0.25M时电池效率最高,达到5.20%。2.我们合成了一种新的离子液体形式的氧化还原电对1-乙基-3-甲基咪唑5-巯基-1-甲基四唑(EMIT),使用不同的对电极组装成染料敏化太阳能电池并测试效率,我们发现碳对电极对电对的催化活性较好,但是限制了离子液体的扩散,最后在AM1.5、光强100mW/cm2的条件下测试光电性能,当对电极为溅射铂电极时电池效率最高,达到2.16%。更多还原

【Abstract】 As one of the best solvent in the 21 century, ionic liquid has been applied to the organic chemical reaction, the separation and purification of the substance, electrochemistry and so on. The ionic liquids (ILs) show unique properties such as negligible vapor pressure, high thermal and chemical stability, wide electrochemical window and so on. These properties indicate that ILs could be good electrolytes used for DSCs. Based on this issue, we chose a series of binary ionic liquids and subsequently prepared a series of the electrolytes with them in order to investigate the effects of the electrolytes on the performance of DSCs. The main content is outlined as follows:1. We chose six kinds of binary ionic liquid electrolytes for dye-sensitized solar cells (DSCs). Amongst them, the electrolyte based on 1-butyl-3-methylimidazolium iodide (BMII) and 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4) reached the highest photoelectric conversion efficiency (PCE) of 4.98%. Measurements of Electrochemical impendence spectroscopy (EIS), UV-Vis spectroscopy, and photovoltaic performance of DSCs using the binary ionic liquid electrolyte based on BMII and EMIMBF4 were performed at varying concentration of iodine. The results showed that the charge-transfer resistance (Rct) and Warburg impedance (Zw) decreased as the iodine concentration increased. In contrast, the absorption intensity of the electrolytes increased. When the concentration of iodine was 0.25 M, the highest PCE of 5.20% was obtained for the DSC based on the binary BMII/EMIMBF4 ionic liquid electrolyte under light intensity of 100 mW cm-22. We synthesized a new redox couple in the form of ionic liquids named 1-ethyl-3-methylimidazolium thiolate (EMIT) and prepared a new binary ionic liquid electrolyte with 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4). Using different counter electrode, we found that the carbon electrode had a better catalytic activity for the redox couple than the Platinum electrode, although it was unfavorable for the diffusion of ionic liquid electrolytes. Finally, with the Platinum electrode, the highest PCE of 2.16% was obtained for the DSC based on the binary EMIT/EMIMBF4 ionic liquid electrolyte under light intensity of 100 m W cm-2.更多还原