Prolonging charge-separation states by doping lanthanide-ions into {001}/{101} facets-coexposed TiO2 nanosheets for enhancing photocatalytic H2 evolution

doi:10.1016/S1872-2067(18)63182-1

Abstract

Abstract:

Ultrathin TiO₂ nanosheets with coexposed {001}/{101} facets have attracted considerable attention because of their high photocatalytic activity. However, the charge-separated states in the TiO₂ nanosheets must be extended to further enhance their photocatalytic activity for H₂ evolution. Herein, we present a successful attempt to selectively dope lanthanide ions into the {101} facets of ultrathin TiO₂ nanosheets with coexposed {001}/{101} facets through a facile one-step solvothermal method. The lanthanide doping slightly extended the light-harvesting region and markedly improved the charge-separated states of the TiO₂ nanosheets as evidenced by UV-vis absorption and steady-state/transient photoluminescence spectra. Upon simulated sunlight irradiation, we observed a 4.2-fold enhancement in the photocatalytic H₂ evolution activity of optimal Yb³⁺-doped TiO₂ nanosheets compared to that of their undoped counterparts. Furthermore, when Pt nanoparticles were used as cocatalysts to reduce the H₂ overpotential in this system, the photocatalytic activity enhancement factor increased to 8.5. By combining these results with those of control experiments, we confirmed that the extended charge-separated states play the main role in the enhancement of the photocatalytic H₂ evolution activity of lanthanide-doped TiO₂ nanosheets with coexposed {001}/{101} facets.

Key words: Photocatalysis, H₂ evolution, Lanthanide ion doping, TiO₂, Coexposed facets, {001} facets, Nanosheets

Yongan Zhu, Zhenyi Zhang, Na Lu, Ruinian Hua, Bin Dong. Prolonging charge-separation states by doping lanthanide-ions into {001}/{101} facets-coexposed TiO₂ nanosheets for enhancing photocatalytic H₂ evolution[J]. Chinese Journal of Catalysis, 2019, 40(3): 413-423.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63182-1

https://www.cjcatal.com/EN/Y2019/V40/I3/413

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Prolonging charge-separation states by doping lanthanide-ions into {001}/{101} facets-coexposed TiO₂ nanosheets for enhancing photocatalytic H₂ evolution

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