文献类型：期刊文献

英文题名：Yolk@shell anatase TiO₂ hierarchical microspheres with exposed {001} facets for high-performance dye sensitized solar cells

作者：Fang, Wen Qi[1];Yang, Xiao Hua[1];Zhu, Hongjun[2];Li, Zhen[3];Zhao, Huijun[4,5];Yao, Xiangdong[6];Yang, Hua Gui[1]

机构：[1]E China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]DuPont China Res & Dev & Management Co Ltd, Shanghai 201203, Peoples R China;[3]Univ Wollongong, ISEM, Wollongong, NSW 2500, Australia;[4]Griffith Univ, Ctr Clean Environm & Energy, Nathan, Qld 4222, Australia;[5]Griffith Univ, Griffith Sch Environm, Nathan, Qld 4222, Australia;[6]Griffith Univ, QLD Micro & Nanotechnol Ctr, Nathan, Qld 4111, Australia

年份：2012

卷号：22

期号：41

起止页码：22082

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000310047200042)】；

基金：This work was financially supported by the collaboration research agreement between DuPont and East China University of Science and Technology (March 2010), Major Basic Research Programme of Science and Technology Commission of Shanghai Municipality (10JC1403200), Shuguang Talents Programme of Education Commission of Shanghai Municipality (09SG27), National Natural Science Foundation of China (20973059, 91022023, 21076076), Fundamental Research Funds for the Central Universities (WJ0913001), Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning and Program for New Century Excellent Talents in University (NCET-09-0347).

语种：英文

摘要：We report a facile, template-free and nontoxic one-pot solvothermal route for synthesizing submicrometer-sized yolk@shell hierarchical spheres, which possess a permeable shell self-assembled by ultrathin anatase TiO2 nanosheets (NSs) with nearly 90% of exposed {001} facets and mesoporous inner sphere with a high specific surface area. Compared to the {001} faceted TiO2 NSs and standard Degussa P25, the anatase TiO2 yolk@shell hierarchical spheres (TiO2 YSHSs) were obtained with surface area up to 245.1 m(2) g(-1) and their submicrometer scale simultaneously promoted light scattering in the visible region. A light to electricity conversion efficiency (eta) of 6.01% was achieved for the DSSCs with TiO2 YSHSs as its photoanode, under 100 mW cm(-2) illumination, indicating 49.9% and 34.8% increases compared to the DSSCs with TiO2 NSs (4.01%) and the standard Degussa P25 (4.46%) as photoanodes, respectively. The enhancement can be mainly attributed to the higher dye loading on TiO2 YSHSs (4.35 x 10(-5) mol cm(-2)) than that of TiO2 NSs (3.14 x 10(-5) mol cm(-2)) and P25 (3.32 x 10(-5) mol cm(-2)); longer lifetime of the injected electrons in TiO2 YSHSs film (65.79 ms) than that of in TiO2 NSs film (57.90 ms); and the good capability of light scattering of TiO2 YSHSs in visible light region, which are confirmed by UV-vis spectrophotometer and electrochemical impedance spectroscopy (EIS). The growth mechanism of the TiO2 YSHSs has also been investigated in detail.