基于低共熔溶剂聚合物电解质染料敏化太阳能电池研究

doi:10.15541/jim20160184

摘要/Abstract

摘要：

以琼脂糖聚合物为基质, 1-甲基-2-吡咯烷酮(NMP)为溶剂, 由尿素、氯化胆碱合成的低共熔溶剂(DES)作为添加剂制备聚合物电解质用于制备准固态染料敏化太阳能电池(DSSC)。研究了尿素/氯化胆碱配比、低共熔溶剂添加量对聚合物电解质电化学性能及其DSSC光电性能的影响。研究结果表明: 随着尿素/氯化胆碱配比增加, 准固态电解质的导电性能增加, 尿素、氯化胆碱的配比为2:1时可获得最佳电导率7.24 mS/cm。对不同低共熔溶剂含量电解质进行离子电导率测试研究发现: 添加量为20wt%时, 电解质获得最佳电导率6.21 mS/cm。染料敏化太阳能电池的光电效率随低共熔溶剂含量的增加先增加后降低, 低共熔溶剂添加量为20wt%时, 获得最佳光电效率η=3.18%, 短路电流密度J_sc=10.28 mA/cm², 开路电压V_oc=0.59 V, 填充因子FF=0.51。

关键词: 染料敏化太阳能电池, 低共熔溶剂, 尿素, 氯化胆碱, 聚合物电解质

Abstract:

A polymer electrolyte using agarose as polymer matrix, NMP as solvent and deep eutectic solvent (DES) as modifier was investigated and employed in quasi-solid-state dye-sensitized solar cells (DSSC) of which the DES was composed by urea and choline chloride. The ionic conductivity of the polymer electrolytes with different urea /choline chloride ratio was studied. It was found that the maximum ionic conductivity of the polymer electrolyte was obtained at urea/choline chloride ratio of 2:1. Under the optimal urea /choline chloride ratio condition, electrochemical properties of the polymer electrolytes and the photovoltaic properties were systematically characterized by photovoltaic tests and electrochemical impedance spectra (EIS). The results showed that both ionic conductivity of electrolyte and photovoltaic performances of the DSSC was optimized with DES content of 20wt%, where the device photovoltaic parameters were as follows, V_oc at 0.59 V, J_sc at 10.28 mA/cm², FF at 0.51, and the cell efficiency at 3.18%.

Key words: dye sensitized solar cell, deep eutectic solvent, urea, choline chloride, polymer electrolyte

中图分类号:

TM914

杨英, 张政, 高菁, 林泽华, 严靖园, 郭学益. 基于低共熔溶剂聚合物电解质染料敏化太阳能电池研究[J]. 无机材料学报, 2017, 32(1): 25-32.

YANG Ying, ZHANG Zheng, GAO Jing, LIN Ze-Hua, YAN Jing-Yuan, GUO Xue-Yi. Deep Eutectic Solvent Based Polymer Electrolyte for Dye-sensitized Solar Cells[J]. Journal of Inorganic Materials, 2017, 32(1): 25-32.

图/表 12

图1 (a)低共熔溶剂聚合物电解质溶液和(b)低共熔溶剂聚合物电解质烘干后实物图

Fig. 1 Pictures of (a) DES based polymer electrolyte solution and (b) DES based polymer electrolyte film after drying

图2 不同尿素/氯化胆碱配比低共熔熔剂改性电解质的紫外吸收光谱图

Fig. 2 UV-Vis spectra of electrolytes modified by DES with different urea/choline chloride ratios

图3 尿素/氯化胆碱摩尔比为2:1的低共熔熔剂结构示意图

Fig. 3 Structural representation of the DES with urea/ choline chloride of 2: 1

图4 不同尿素/氯化胆碱配比的低共熔溶剂的电解质的离子电导率图

Fig. 4 Ionic conductivity of electrolytes with DES of different urea/choline chloride ratio

图5 不同含量低共熔溶剂改性的聚合物电解质的SEM照片

Fig. 5 SEM images of polymer electrolyte with different contents of DES(a) 0; (b) 10wt%; (c) 20wt%; (d) 40wt%; (e) 60wt%; (f) 80wt%

图6 不同含量低共熔溶剂改性电解质的紫外吸收光谱图

Fig. 6 UV-Vis spectra of electrolytes modified with different contents of DES

图7 不同含量低共熔溶剂改性电解质的离子电导率图

Fig. 7 Ionic conductivity of electrolytes modified with different contents of DES

图8 不同含量低共熔溶剂改性电解质染料敏化太阳能电池的J-V曲线图

Fig. 8 J-V characteristics of the DSSCs fabricated using electrolytes modified with different contents of DES

表1 不同含量低共熔溶剂电解质电池光电性能关键参数

Table 1 Performance parameters of the DSSCs fabricated using electrolytes modified with different contents of DES

ω/ wt%	J_sc/(mA·cm^-2)	V_oc/V	FF	η/%
0	8.36	0.44	0.33	1.24 %
10	10.32	0.40	0.33	1.40%
20	10.28	0.59	0.51	3.18%
40	6.04	0.45	0.50	1.41%
60	3.46	0.47	0.54	0.91%
80	2.40	0.71	0.54	0.93%

图9 不同含量低共熔溶剂改性电解质染料敏化太阳能电池的Bode图

Fig. 9 Bode plots of the DSSCs fabricated using electrolytes modified with different contents of DES

图10 不同含量低共熔溶剂对光阳极中电荷电子寿命的影响

Fig.10 Influence of DES contents on electron lifetime in photoanode

图11 40wt%低共熔溶剂改性电解质染料敏化太阳能电池的稳定性分析

Fig.11 Stablity test of Jsc, Voc, and η for DSSC fabricated using 40wt% EDS electrolyte

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