基于卤素间离子盐和液体的染料敏化太阳能电池电解质

Electrolytes for dye-sensitized solar cells based on interhalogen ionic salts and liquids.

作者信息

Gorlov Mikhail, Pettersson Henrik, Hagfeldt Anders, Kloo Lars

机构信息

Center of Molecular Devices, Department of Chemistry, The Royal Institute of Technology, Teknikringen 30, S-100 44 Stockholm, Sweden.

出版信息

Inorg Chem. 2007 Apr 30;46(9):3566-75. doi: 10.1021/ic062244b. Epub 2007 Apr 7.

DOI:10.1021/ic062244b

PMID:17417833

Abstract

In this paper, we report on the preparation of interhalogen ionic liquids of the general formula [K+]XY2-, where K+=1,3-dialkylimidazolium, 1,2,3-trialkylimidazolium, or N-alkylpyridinium; XY2-=IBr2- or I2Br-. These compounds were characterized in solution and the solid state by NMR, IR, Raman, and mass spectroscopy. The crystal structure of the compound [Me2BuIm]IBr2 (7) shows that the IBr2- anion has a linear Br-I-Br structure. Indications of an equilibrium between different forms of XY2- anions in solution are observed. Interhalogen ionic salts and liquids were used as electrolyte components for encapsulated monolithic dye-sensitized solar cells. Overall light-to-electricity conversion efficiencies up to 6.4%, 5.0%, and 2.4% at 1000 W/m2 were achieved by using electrolytes based on interhalogen ionic salts and gamma-butyrolactone, glutaronitrile, or native ionic liquids as solvents, respectively. Moreover, in terms of stability, the cell performance lost 9-14% of the initial performance after 1000 h illumination at 350 W/m2.

摘要

在本文中，我们报道了通式为[K⁺]XY₂⁻的卤素间离子液体的制备，其中K⁺ = 1,3 - 二烷基咪唑鎓、1,2,3 - 三烷基咪唑鎓或N - 烷基吡啶鎓；XY₂⁻ = IBr₂⁻或I₂Br⁻。这些化合物通过核磁共振（NMR）、红外光谱（IR）、拉曼光谱和质谱在溶液和固态中进行了表征。化合物[Me₂BuIm]IBr₂（7）的晶体结构表明，IBr₂⁻阴离子具有线性的Br - I - Br结构。观察到溶液中不同形式的XY₂⁻阴离子之间存在平衡的迹象。卤素间离子盐和液体被用作封装式整体染料敏化太阳能电池的电解质成分。分别使用基于卤素间离子盐和γ - 丁内酯、戊二腈或天然离子液体作为溶剂的电解质，在1000 W/m²光照下实现了高达6.4%、5.0%和2.4%的整体光电转换效率。此外，在稳定性方面，电池性能在350 W/m²光照1000小时后损失了初始性能的9 - 14%。