物理化学学报 >> 2012, Vol. 28 >> Issue (12): 2852-2860.doi: 10.3866/PKU.WHXB201210091

电化学和新能源 上一篇    下一篇

基于新型交联聚合物电解质的准固态染料敏化太阳能电池

梁桂杰1,2, 钟志成1, 许杰3, 张增常1, 陈美华1, 李在房1, 和平1   

  1. 1 湖北文理学院材料科学与工程研究中心, 襄阳 441053;
    2 西安交通大学金属材料强度国家重点实验室, 西安 710049;
    3 武汉纺织大学新型纺织材料绿色加工及其功能化教育部重点实验室, 武汉 430073
  • 收稿日期:2012-06-18 修回日期:2012-09-29 发布日期:2012-11-14
  • 通讯作者: 梁桂杰, 钟志成 E-mail:lgj511011@163.com; zczhongf@163.com
  • 基金资助:

    国家自然科学基金(51003082); 教育部科学技术研究重点项目(208089)及湖北省自然科学基金(2011CDC062)资助

Quasi-Solid State Dye-Sensitized Solar Cells Based on the Novel Crosslinked Polymer Electrolyte

LIANG Gui-Jie1,2, ZHONG Zhi-Cheng1, XU Jie3, ZHANG Zeng-Chang1, CHEN Mei-Hua1, LI Zai-Fang1, HE Ping1   

  1. 1 Research Center for Materials Science & Engineering, Hubei University of Arts and Science, Xiangyang 441053, P. R. China;
    2 State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiao Tong University, Xi'an 710049, P. R. China;
    3 Key Laboratory of Green Processing and Functional Textiles of New Textile Materials, Ministry of Education, Wuhan Textile University, Wuhan 430073, P. R. China
  • Received:2012-06-18 Revised:2012-09-29 Published:2012-11-14
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51003082), Key Project of Science and Technology Research of the Ministry of Education of China (208089), and Natural Science Foundation of Hubei Province, China (2011CDC062).

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摘要：

采用柠檬酸(CA)交联聚乙二醇(oligo-PEG, 平均分子量Mw=200, 400, 1000, 2000), 合成具有可生物降解性能的聚柠檬酸-乙二醇(PCE)交联聚酯, 并以此为基体材料制备得到准固态的三维交联型PCE/LiI/I2聚合物电解质. 采用红外吸收光谱(IR)、核磁共振氢谱(1H-NMR)、扫描电镜(SEM)和Raman光谱分别对PCE基体的分子结构、聚合物电解质的微观形貌以及导电离子对的存在形式进行表征; 通过线性扫描伏安法(LSV)研究了聚合物电解质的离子扩散系数、电导率以及电池的输出电流-电压(I-V)性能. 结果表明, PEG的分子量影响PCE基体膜的微观形貌及其吸液性能, 从而影响聚合物电解质的离子导电性能及电池的光电性能: 随着PEG分子量Mw从200, 400, 1000增大到2000, PCE基体膜的结构变得疏松, 吸液率增加, 吸液溶胀后的基体中I-3的跃迁活化能降低, 导致电解质的电导率和电池的短路光电流密度随之增加; 在60 mW·cm-2的入射光强下, 四种电解质对应电池的光电转化效率依次为3.26%、3.34%、4.26%和4.89%.

关键词: 聚合物电解质, 聚乙二醇分子量, 交联, 吸液性能, 离子电导率

Abstract:

A quasi-solid-state three-dimensionally crosslinked poly(citric acid-ethylene glycol) (PCE)/ LiI/I2 polymer electrolyte has been prepared using biodegradable PCE synthesized via a crosslinking reaction between citric acid (CA) and oligo-polyethylene glycol (PEG) (average molecular weight Mw= 200, 400, 1000, 2000) as a matrix. The molecular structure of the PCE matrix, micro-morphology of polymer electrolyte, and the state of conductive ion-pairs in the electrolyte were characterized by infrared (IR) spectrum, 1H nuclear magnetic resonance (1H-NMR), and Raman spectroscopy, as well as scanning electron microscopy (SEM). The ionic diffusion coefficient and conductivity of polymer electrolytes and the output current-voltage (I-V) properties of the cells were investigated via linear sweep voltammetry. The results reveal that PEG molecular weights influence the mesh morphology and the absorbent properties of the PCE matrix, which influences the polymer electrolyte ionic conductive performance and the photoelectric performance of the cells. As PEG molecular weights increased from 200, 400, 1000 to 2000, the PCE matrix mesh structure became looser, the liquid electrolyte uptake of the matrix increased, and the transition activation energies of I3- in the swollen PCE matrix decreased, which led to an increase in the electrolyte conductivity and the short circuit photocurrent densities of the cells accordingly. The photoelectric conversion efficiencies of the cells assembled by the four polymer electrolytes above were 3.26%, 3.34%, 4.26%, and 4.89%, respectively, under an incident light intensity of 60 mW·cm-2.

Key words: Polymer electrolyte, Polyethylene glycol molecular weight, Cross-linking, Absorbent property, Ionic conductivity