Engineering oxygen vacancy on rutile TiO2 for efficient electron-hole separation and high solar-driven photocatalytic hydrogen evolution

  • Fang Xiao (肖芳)
  • Wei Zhou (周卫)
  • Bojing Sun (孙博婧)
  • Haoze Li (李昊泽)
  • Panzhe Qiao (乔盼哲)
  • Liping Ren (任丽萍)
  • Xiaojun Zhao (赵小军)
  • Honggang Fu (付宏刚)
Articles
  • 35 Downloads

Abstract

Oxygen vacancy (VO) plays a vital role in semiconductor photocatalysis. Rutile TiO2 nanomaterials with controllable contents of VO (0–2.18%) are fabricated via an in situ solid-state chemical reduction strategy, with color from white to black. The bandgap of the resultant rutile TiO2 is reduced from 3.0 to 2.56 eV, indicating the enhanced visible light absorption. The resultant rutile TiO2 with optimal contents of VO (∼2.07%) exhibits a high solar-driven photocatalytic hydrogen production rate of 734 μmol h−1, which is about four times as high as that of the pristine one (185 μmol h−1). The presence of VO elevates the apparent Fermi level of rutile TiO2 and promotes the efficient electronhole separation obviously, which favor the escape of photogenerated electrons and prolong the life-time (7.6×103 ns) of photogenerated charge carriers, confirmed by scanning Kelvin probe microscopy, surface photovoltage spectroscopy and transient-state fluorescence. VO-mediated efficient photogenerated electron-hole separation strategy may provide new insight for fabricating other high-performance semiconductor oxide photocatalysts.

Keywords

oxygen vacancy rutile TiO2 surface engineering solar-driven photocatalysis hydrogen evolution 

具有高效电子-空穴分离和优异太阳光催化产氢性能的金红石TiO2表面的氧空位调控

摘要

氧空位缺陷在半导体光催化中起重要作用. 本文采用原位固态化学还原策略可控制备了具有不同氧空位含量(0∼2.18%)的金红石TiO2纳米材料, 其带隙由3.0 eV减小到2.56 eV, 颜色由白色变为黑色. 氧空位含量为∼2.07%的样品具有最高的太阳光催化产氢性能(734 μmol h−1), 产氢量约为原始样品(185 μmol h−1)的四倍. 扫描开尔文探针、 表面光电压和瞬态荧光结果表明: 氧空位的出现提升了金红石TiO2的表观费米能级并促进了光生电子-空穴的分离, 有利于光生电子的溢出和光生载流子寿命的延长(7.6×103 ns). 这种由氧空位缺陷诱导的光生电子-空穴高效分离策略为构筑其它高性能半导体氧化物光催化剂提供了新思路.

Notes

Acknowledgements

This work was supported by the Key Program Projects of the National Natural Science Foundation of China (21631004) and the National Natural Science Foundation of China (51672073).

Supplementary material

40843_2018_9222_MOESM1_ESM.pdf (527 kb)
Engineering oxygen vacancy on rutile TiO2 for efficient electron-hole separation and high solar-driven photocatalytic hydrogen evolution

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Fang Xiao (肖芳)
    • 1
    • 2
  • Wei Zhou (周卫)
    • 3
  • Bojing Sun (孙博婧)
    • 3
  • Haoze Li (李昊泽)
    • 3
  • Panzhe Qiao (乔盼哲)
    • 3
  • Liping Ren (任丽萍)
    • 3
  • Xiaojun Zhao (赵小军)
    • 1
    • 2
  • Honggang Fu (付宏刚)
    • 3
  1. 1.Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic−Organic Hybrid Functional Materials Chemistry (Tianjin Normal University), Ministry of Education of ChinaTianjinChina
  2. 2.College of ChemistryTianjin Normal UniversityTianjinChina
  3. 3.Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of ChinaHeilongjiang UniversityHarbinChina

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