双峰纳晶介孔TiO_2的制备及在染料敏化太阳电池中的应用

Synthesis of bimodal nanocrystal mesoporous titania and its application in dye-sensitized solar cells

采用水热法,以三嵌段共聚物聚氧化乙烯-聚氧化丙烯-聚氧化乙烯(EO20PO70EO20,P123)为模板剂,钛酸四丁酯为前驱体,制备了双峰纳晶介孔TiO2,分别利用X射线衍射(XRD)、比表面积与孔径分析、场发射扫描电子显微镜(SEM)以及透射电子显微镜(TEM)对制备的介孔TiO2的相结构、比表面积、孔径和形貌进行了表征,探讨了P123用量对纳晶TiO2微结构的影响。以双峰纳晶介孔TiO2作为染料敏化太阳电池的光阳极材料组装的太阳电池的光电转化效率达5.18%,与相同条件下以P25作光阳极材料组装的电池效率(4.02%)相比提高了28.85%,初步显示了双峰纳晶介孔TiO2在太阳电池领域中的应用潜力。

Bimodal nanocrystal mesoporous titania was prepared using the triblock copolymer of ethylene oxide and propylene oxide（EO20PO70EO20,P123）as a template through a hydrothermal treatment.The phase structure,specific surface area,pore size and morphology of the resulting TiO2 were characterized by X ray diffraction（XRD）,nitrogen adsorption-desorption apparatus,scanning electron microscope（SEM）and transmission electron microscope（TEM）.The results reveal that the amount of P123has a significant effect on the microstructure of the nanocrystal mesoporous titania. The bimodal nanocrystal mesoporous titania was finally employed as the photoanode of dye-sensitized solar cells,and the photoelectric conversion efficiency was 5.18%,which is 28.85% higher than that made from P25.The bimodal nanocrystal mesoporous titania materials is potential in the field of photovoltaic material.