分级微纳结构TiO2空心球的制备及其在DSSC中的应用

以钛酸四丁酯为钛源,无水乙醇为溶剂,通过碳球模板法制备出直径为200nm、壳厚20～25nm的TiO2空心球（HS）.通过X射线衍射（XRD）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）和N2吸附脱附等对产物的形貌、晶相组成、孔结构和紫外-可见光谱性质进行了表征,结果显示所制备的锐钛矿相TiO2空心微球是由初级结构纳米级TiO2晶粒构成的.将这种TiO2空心球应用于染料敏化太阳电池（DSSC）领域可以提高光阳极对光的散射.通过制备P25/HS-TiO2双层膜电极,相比单纯的P25纳米晶电极（Jsc=13.5mAcm？2,Voc=0.653V,FF=0.53,η=4.95%）可以得到更高的光电转化效率（Jsc=15.79mAcm？2,Voc=0.653V,FF=0.55,η=6.66%）.

Preparation of TiO2 hollow spheres with hierarchical micro/nano architectures and its application in dye sensitized solar cells

The TiO2 hollow spheres with diameter of 200 nm and shell thickness of 20～25 nm were synthesized via a templates method using titanium butoxide as the titanium source and ethanol absolute as solvent.The morphology,crystal phases,porous structures and UV-vis spectra of the product were characterized by X-ray diffraction（XRD）,transmission electron microscope（TEM）,scanning electron microscope（SEM） and N2 adsorption-desorption.The results show that the anatase TiO2 hollow sphere（HS） is consist of TiO2 nanometer particles.TiO2 hollow spheres are used in dye-sensitized solar cell（DSSC） to increase the light scattering.By fabrication of TiO2 P25/HS double-layer film electrode,a higher performance of the DSSC（Jsc = 15.79 mA cm？2,Voc = 0.653 V,FF = 0.55,η = 6.66%） is obtained compared with the pure P25 nanocrystalline DSSC（Jsc = 13.5 mA cm？2,Voc = 0.653 V,FF = 0.53,η = 4.95%）.