摘要
以聚乙二醇(PEG)和异氰酸酯为单体,添加由1,4-丁内酯溶解(C4H9)4NI/I2配制的液态电解质,形成一系列的聚醚型聚氨酯凝胶电解质。通过动态机械热分析(DMTA)、傅里叶红外光谱仪(FTIR)、差示扫描量热仪(DSC)、X射线衍射(XRD)等方法对聚氨酯凝胶电解质结构进行表征,测试结果表明此类电解质具有良好的热稳定性和非晶相结构。同时,研究了PEG分子量、异氰酸酯单体的改变对聚氨酯凝胶电解质电导率的影响,发现PEG分子量的增大使聚氨酯凝胶电解质的电导率先增加后降低,当PEG分子量为10000时,所合成凝胶电解质的电导率达到最大,为6.13mS/cm,而异氰酸酯单体的改变对电解质的电导率影响不大。扫描电子显微镜(SEM)测试结果表明这可能与聚氨酯中形成的不同网状结构有关。在100mW/cm2的入射光强下,不同分子量PEG制备的聚氨酯凝胶电解质组装的染料敏化太阳能电池(DSSCs)的光电性能不同,其中PEG分子量为10000合成的聚氨酯凝胶电解质组装的电池的光电转化效率最高,为4.29%。
A series of polyether polyurethane （PU） gel electrolytes are prepared with polyethylene glycol （PEG） and isocyanate as monomers, and adding liquid electrolyte formulated by 1,4-butyrolactone （GBL）, （C4H9 ） 4 NI and I2. The structure of the polyurethane gel electrolyte is characterized by dynamic mechanical thermal analysis （DMTA）, Fourier transform infrared spectrometer （FTIR）, differential scanning calorimeter （DSC） and X-ray diffraction （XRD）. The results show that this type gel electrolyte has a good thermostability and amorphous structure. The influence of PEG molecular weight and isosyanate monomer on the conductivity of PU gel electrolyte is analyzed. It is found that the conductivity of PU gel electrolyte increases firstly and then decreases with the PEG molecular weight increasing. When the PEG molecular weight is 10000, the conductivity of the gel electrolyte reaches a maximum of 6, 13 mS/cm. However, change of isocyanate monomer has almost no effect on the conductivity of the electrolyte. That may be related to the formed network of PU gel electrolyte by scanning electron microscope （SEM） characterization. The quasi-solid-state dye-sensitised solar cells （DSSCs） assembled with PU gel electrolyte prepared by different PEG molecular weight show different photovoltaic properties. A high photoelectric conversion efficiency of 4.29% is achieved at 100 mW/cm2 when PEG molecular weight is 10000.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第3期194-200,共7页
Acta Optica Sinica
基金
国家自然科学基金(51103013)
北京市教育委员会科技计划(KM201110017007)
北京市属高等学校人才强教计划(PHR201108359)
