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

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Abstract

The production of H2 and O2 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 H2/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 H2 and O2 evolution. As expected, the optimum treatment conditions provided hydrogenated TiO2/SrTiO3 porous microspheres that showed excellent photocatalytic activity with H2 and O2 evolution rates of 239.97 and 103.79 μmol 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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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51272070, 21631004, 21371053, and 21376065), the Project for Foshan Innovation Group (2014IT100062), the Application Technology Research and Development Projects in Harbin (2013AE4BW051), the International Science & Technology Cooperation Program of China (2014DFR41110), the Natural Science Foundation of Heilongjiang province (E201455), the Postdoctoral Science-research Developmental Foundation of Heilongjiang province (LBH-Q13136), and the Special Fund of Technological Innovation Talents in Harbin City (2015RAQXJ003).

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Correspondence to Guohui Tian or Honggang Fu.

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Taoran Han received her MSc degree from Heilongjiang University under the supervision of Prof. Guohui Tian. Her research interests include the photocatalytic water splitting, photoelectrochemistry water splitting and controlled synthesis of nanomaterials.

Honggang Fu received his BSc and MSc degrees from Jilin University in 1984 and 1987, respectively. Then, he joined Heilongjiang University as an assistant professor. In 1999, he received his PhD degree fromHarbin Institute of Technology. He became a full professor in 2000. Currently, he is a Cheung Kong Scholar Professor. His interests focus on oxide-based semiconductor nanomaterials for solar energy conversion and photocatalysis, and crystalline carbon-based nanomaterials for energy conversion and storage. Up to now, he has published more than 260 peer-reviewed papers with over 4500 citations.

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

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Han, T., Chen, Y., Tian, G. et al. Hydrogenated TiO2/SrTiO3 porous microspheres with tunable band structure for solar-light photocatalytic H2 and O2 evolution. Sci. China Mater. 59, 1003–1016 (2016). https://doi.org/10.1007/s40843-016-5126-1

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