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

doi:10.3866/PKU.WHXB201301091

Abstract

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

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 Phys. -Chim. Sin. 2013, 29(03), 525-532. doi: 10.3866/PKU.WHXB201301091

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

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