4.7 Article

Hydrogenated TiO2/SrTiO3 porous microspheres with tunable band structure for solar-light photocatalytic H2 and O2 evolution

Journal

SCIENCE CHINA-MATERIALS
Volume 59, Issue 12, Pages 1003-1016

Publisher

SCIENCE PRESS
DOI: 10.1007/s40843-016-5126-1

Keywords

TiO2/SrTiO3; heterostructure; oxygen vacancy; visible-light absorption; photocatalysis

Funding

  1. National Natural Science Foundation of China [51272070, 21631004, 21371053, 21376065]
  2. Project for Foshan Innovation Group [2014IT100062]
  3. Application Technology Research and Development Projects in Harbin [2013AE4BW051]
  4. International Science & Technology Cooperation Program of China [2014DFR41110]
  5. Natural Science Foundation of Heilongjiang province [E201455]
  6. Postdoctoral Science-research Developmental Foundation of Heilongjiang province [LBH-Q13136]
  7. Special Fund of Technological Innovation Talents in Harbin City [2015RAQXJ003]

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The production of H-2 and O-2 from solar-light photocatalytic water splitting has attracted significant research attention as a clean and renewable source of energy. In this study, hydrogenated TiO2/SrTiO3 porous microspheres were prepared as a high-performance photocatalyst. Titanium glycerolate and then strontium complex precursors were first prepared via a two-step solvothermal process, then, after calcination in air and subsequent H-2/Ar reduction treatments, hydrogenated TiO2/SrTiO3 porous microspheres with controllable defects and band positions were prepared. Several characterization techniques were used to demonstrate that the catalyst heterostructures, the oxygen-vacancy content, and the unique porous structures synergistically enhanced the visible-light harvesting abilities and photogenerated charge separation, and resulted in improved photocatalytic efficiency for H-2 and O-2 evolution. As expected, the optimum treatment conditions provided hydrogenated TiO2/SrTiO3 porous microspheres that showed excellent photocatalytic activity with H-2 and O-2 evolution rates of 239.97 and 103.79 mu mol h(-1) (50 mg catalyst, under AM 1.5 irradiation), respectively, which were ca. 5.9 and 6.6 times higher, respectively, than those of solid TiO2/SrTiO3 materials. Thus, this type of hydrogenated TiO2/SrTiO3 porous microsphere catalyst shows great potential as a photocatalyst for solar-energy conversion applications.

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