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

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

Yongan Zhu ^a,b, ,
Zhenyi Zhang ^a ,
Na Lu ^a ,
Ruinian Hua ^a,b ,
Bin Dong ^a

a Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials and Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Nationalities University, Dalian 116600, Liaoning, China;
b College of Life Science, Dalian Nationalities University, Dalian 116600, Liaoning, China

Received Date: 26 August 2018
Revised Date: 9 October 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (51772041, 11474046, 61775024), the Natural Science Foundation of Liaoning Province (20170540190, 201602191), the Program for Liaoning Excellent Talents in University (LNET) (LR2015016, LR2017004), the Program for Dalian Excellent Talents (2016RQ069), the Science and the Technique Foundation of Dalian (2014J11JH134, 2015J12JH201), and the Fundamental Research Funds for the Central Universities (wd01206).

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.
- Photocatalysis,
- H₂ evolution,
- Lanthanide ion doping,
- TiO₂,
- Coexposed facets,
- {001} facets,
- Nanosheets
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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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通讯作者: 陈斌, bchen63@163.com

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