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

Journal Article


Abstract


  • 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 m2 g−1 and their submicrometer scale simultaneously promoted light scattering in the visible region. A light to electricity conversion efficiency (η) 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 × 10−5 mol cm−2) than that of TiO2 NSs (3.14 × 10−5 mol cm−2) and P25 (3.32 × 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.

UOW Authors


  •   Zhao, Huijun (external author)
  •   Zhu, Hongjun (external author)
  •   Yang, Hua Gui (external author)
  •   Fang, Wen Qi (external author)
  •   Yang, Xiao Hua (external author)
  •   Yao, Xiangdong (external author)
  •   Li, Zhen

Publication Date


  • 2012

Citation


  • Fang, W., Yang, X., Zhu, H., Li, Z., Zhao, H., Yao, X. & Yang, H. (2012). Yolk@shell anatase TiO2 hierarchical microspheres with exposed {001} facets for high-performance dye sensitized solar cells. Journal of Materials Chemistry, 22 (41), 22082-22089.

Scopus Eid


  • 2-s2.0-84867300201

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/355

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 22082

End Page


  • 22089

Volume


  • 22

Issue


  • 41

Abstract


  • 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 m2 g−1 and their submicrometer scale simultaneously promoted light scattering in the visible region. A light to electricity conversion efficiency (η) 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 × 10−5 mol cm−2) than that of TiO2 NSs (3.14 × 10−5 mol cm−2) and P25 (3.32 × 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.

UOW Authors


  •   Zhao, Huijun (external author)
  •   Zhu, Hongjun (external author)
  •   Yang, Hua Gui (external author)
  •   Fang, Wen Qi (external author)
  •   Yang, Xiao Hua (external author)
  •   Yao, Xiangdong (external author)
  •   Li, Zhen

Publication Date


  • 2012

Citation


  • Fang, W., Yang, X., Zhu, H., Li, Z., Zhao, H., Yao, X. & Yang, H. (2012). Yolk@shell anatase TiO2 hierarchical microspheres with exposed {001} facets for high-performance dye sensitized solar cells. Journal of Materials Chemistry, 22 (41), 22082-22089.

Scopus Eid


  • 2-s2.0-84867300201

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/355

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 22082

End Page


  • 22089

Volume


  • 22

Issue


  • 41