期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 41, 页码 22082-22089出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm34787c
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资金
- DuPont
- East China University of Science and Technology
- 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
- Program for New Century Excellent Talents in University [NCET-09-0347]
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.
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