Citation: WANG Hai, XU Xue-Qing, SHI Ji-Fu, XU Gang. Application of Ionic Liquids with Carboxyl and Aromatic Ring Conjugated Anions in Dye-Sensitized Solar Cells[J]. Acta Physico-Chimica Sinica, ;2013, 29(03): 525-532. doi: 10.3866/PKU.WHXB201301091 shu

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

WANG Hai ^1,2,3 ,
XU Xue-Qing ^1,2 ,
SHI Ji-Fu ^1,2 ,
XU Gang ^1,2

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 Date: 25 October 2012
Available Online: 9 January 2013
Fund Project: 国家自然科学基金(21103194, 21273241) (21103194, 21273241) 广州市珠江科技新星专项(2012061) (2012061)中国科学院广州能源研究所所长创新基金(y007r71001)资助项目 (y007r71001)

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.
- Ionic liquid,
- Viscosity,
- Electrolyte,
- Conductivity,
- Dye-sensitized solar cell
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