摘要
对6种用于染料敏化太阳能电池的二元离子液体电解质进行了考察,电池的光电转化效率在1.39%～4.98%,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。对这种二元离子液体电解质体系进一步优化,测试了不同碘浓度下相应染料敏化太阳能电池的效率、电化学阻抗谱(EIS)和紫外-可见吸收光谱(UV-vis)。结果表明,随着碘单质浓度的增大,铂-电解质界面的传荷电阻(RPt)、TiO2-电解质表面的传荷电阻(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,在AM1.5的条件下,当碘单质的浓度为0.25 mol/L时电池效率最高,达到5.20%。
Six kinds of binary ionic liquid electrolytes were used for DSC and the photoelectric conversion efficiency（PCE） of the device varied from 1.39% to 4.98%. Among these ionic liquids, the electrolyte composed of 1-butyl-3-methylimidazolium iodide （ BMII ） and 1-ethyl-3- methylimidazolium tetrafluoroborate （EmimBF4 ） exhibited the highest efficiency. In order to optimize these binary ionic liquids electrolytes, electrochemical impendence spectroscopy （EIS）, UV-vis spectroscopy, and photovohaic performance of DSC based on BMII and EmimBF4 with different concentration of iodine were performed. The results show that the Pt - electrolyte charge-transfer resistance （ RPt ）, the TiO2 - electrolyte charge-transfer resistance （ Rct ） and Warburg impedance （ Zw ） decreased with the iodine concentration increasing：however, the absorption intensity of the electrolytes increased. When the concentration of iodine was 0. 25 tool/L, the highest PCE of 5.20% was obtained for the DSC based on the binary BMII/EmimBF4 ionic liquid electrolyte under AM1.5.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2011年第11期1129-1133,共5页
Fine Chemicals
基金
国家自然科学基金项目(30000112)~~
