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简单配位合成LiI-Urea二元离子液体并向其中添加第三组分I_2得到二元离子液体基电解质。采用FITR和紫外分光光度计表征了离子液体的结构及电解质的组成。采用线性扫描伏安法测试了电解质中I_3~-的极限电流密度,以此计算得到I_3~-的扩散系数。测试了电解质的电导率,探讨了电解质的组成与电导率之间的关系。结果表明,LiI/Urea的配比影响两组分之间的络合作用,从而影响I_3~-的扩散系数及电解质的电导率。室温下,两组分的摩尔比为n(LiI/Urea)=0.225时,I_3~-的扩散系数为2.29×10~(-6)cm~2·s~(-1),电导率达到2.63×10~(-3)S·cm~(-1),满足染料敏化太阳电池实用要求。
LiI-Urea binary ionic liquid is simply coordinated and a third component I 2 is added to obtain a binary ionic liquid based electrolyte. The structure of the ionic liquid and the composition of the electrolyte were characterized by FITR and UV spectrophotometer. The linear current voltammetry was used to measure the current density of I_3 ~ - in the electrolyte, and the diffusion coefficient of I_3 ~ - was calculated. The conductivity of the electrolyte was tested, and the relation between the composition of the electrolyte and the conductivity was discussed. The results show that the ratio of LiI / Urea affects the complexation between the two components and thus affects the diffusion coefficient of I 3 - and the conductivity of the electrolyte. The diffusion coefficient of I_3 ~ - is 2.29 × 10 -6 cm -2 · s -1 at room temperature when the molar ratio of the two components is LiI / Urea = 0.225, and the conductivity reaches 2.63 × 10 ~ (-3) S · cm ~ (-1), meet the practical requirements of dye-sensitized solar cells.