物理化学学报 >> 2013, Vol. 29 >> Issue (03): 525-532.doi: 10.3866/PKU.WHXB201301091

电化学和新能源 上一篇    下一篇

阴离子为羧酸根和芳环共轭的离子液体在染料敏化太阳能电池中的应用

王海1,2,3, 徐雪青1,2, 史继富1,2, 徐刚1,2   

  1. 1 中国科学院广州能源研究所, 广州 510640;
    2 中国科学院可再生能源与天然气水合物重点实验室, 广州 510640;
    3 中国科学院大学, 北京 100049
  • 收稿日期:2012-10-25 修回日期:2013-01-08 发布日期:2013-02-25
  • 通讯作者: 史继富, 徐刚 E-mail:xugang@ms.giec.ac.cn; shijf@ms.giec.ac.cn
  • 基金资助:

    国家自然科学基金(21103194, 21273241); 广州市珠江科技新星专项(2012061)和中国科学院广州能源研究所所长创新基金(y007r71001)资助项目

Application of Ionic Liquids with Carboxyl and Aromatic Ring Conjugated Anions in Dye-Sensitized Solar Cells

WANG Hai1,2,3, XU Xue-Qing1,2, SHI Ji-Fu1,2, XU Gang1,2   

  1. 1 Guangzhou Institute of Energy Conversion 510640, P. R. China;
    2 Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Science, Guangzhou 510640, P. R. China;
    3 University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2012-10-25 Revised:2013-01-08 Published:2013-02-25
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21103194, 21273241), Pearl River Science and Technology New Star of Guangzhou, China (2012061), and Director Innovation Foundation of Guangzhou Institute of Energy Conversion of Chinese Academy of Sciences (y007r71001).

摘要:

提出了利用p-π共轭效应设计离子液体的方法, p-π共轭效应可以有效分散阴离子的负电荷, 降低离子液体中阴阳离子之间的库仑引力, 以得到低粘度的离子液体. 所设计的离子液体为1-乙基-3-甲基咪唑苯甲酸(EMIB)和1-乙基-3-甲基咪唑异烟酸(EMIIN) (它们的阴离子中羧酸根和芳环为p-π共轭结构), 这两种离子液体都达到了较低的粘度(EMIB为42 mPa·s, EMIIN为27 mPa·s). 进一步将这两种离子液体做成电解质, 应用在染料敏化太阳能电池中, 通过优化电解质的组成, EMIB基电解质达到了1.43 mS·cm-1的电导率和1.45×10-7cm2·s-1的I3?的扩散系数, 而EMIIN基电解质的电导率和I3?扩散系数分别为1.63 mS·cm-1和2.01×10-7 cm2·s-1,后者电导性能的提高主要和EMIIN粘度较低有关系. 进一步将这两种电解质组装成电池, 在300 W·m-2的光强下测得EMIB基电池和EMIIN基电池的效率分别为2.85%和4.30%.

关键词: 离子液体, 粘度, 电解质, 电导率, 染料敏化太阳能电池

Abstract:

A method of utilizing p-π conjugation effects for obtaining low-viscosity ionic liquids is presented. p-π conjugation effectively disperses anionic charge and reduces Coulombic interactions. Ionic liquids prepared in this study were 1-ethyl-3-methylimidazolium benzoate (EMIB) and 1-ethyl-3- methylimidazolium isonicotinate (EMIIN). They have carboxyl and aromatic ring p-π conjugated anions, and achieve low viscosities of 42 and 27 mPa·s, respectively. EMIB and EMIIN were employed as electrolytes, which were used to construct dye-sensitized solar cells (DSCs). After optimizing the composition, the ionic conductivity and triiodide ionic diffusion constant for the EMIB-based electrolyte were 1.43 mS·cm-1 and 1.45 × 10-7 cm2·s-1, respectively. For the EMIIN-based electrolyte, the ionic conductivity and triiodide ionic diffusion constant were 1.63 mS·cm-1 and 2.01×10-7 cm2·s-1, respectively. These were higher than the corresponding values for the EMIB-based electrolyte because of EMIIN's lower viscosity. DSCs based on these two electrolytes attained satisfactory energy conversion efficiencies of 2.85% and 4.30% for EMIB and EMIIN, respectively, under an illumination intensity of 300 W·m-2.

Key words: Ionic liquid, Viscosity, Electrolyte, Conductivity, Dye-sensitized solar cell

MSC2000: 

  • O646