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Research Article

Aerodynamic levitated laser annealing method to defective titanium dioxide with enhanced photocatalytic performance

Hehe Wei1,§Xiaoguang Ma2,§Liu Gu3,§Jianqiang Li2( )Wenjie Si1Gang Ou1,4Wen Yu1Chunsong Zhao1Jiaying Li1,2Mingjun Song1Zhijian Peng3Hui Wu1( )
State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing100084China
National Engineering Laboratory for Hydrometallurgical Cleaner Production TechnologyKey Laboratory of Green Process and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China
School of Engineering and TechnologyChina University of GeosciencesBeijing100083China
Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and EngineeringTsinghua UniversityBeijing100084China

§These authors contributed equally to this work.

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Abstract

Defective TiO2 has attracted increasing attention for use in photocatalytic and electrochemical materials because of its narrowed band-gap and improved visible-light photocatalytic activity. However, a facile and efficient approach for obtaining defect-rich TiO2 still remains a challenge. Herein, we demonstrate such an approach to narrow its bandgap and improve visible-light absorption through implanting abundant defects by aerodynamic levitated laser annealing (ALLA) treatment. Note that the ALLA method not only provides rapid annealing, solidifying and cooling process, but also exhibits high efficiency for homogeneous and defective TiO2 nanoparticles. The laser-annealed TiO2 achieves a high hydrogen evolution rate of 8.54 mmol·h–1·g–1, excellent decomposition properties within 60 min, and outstanding recyclability and stability, all of which are superior to the corresponding properties of commercial P25.

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Nano Research
Pages 3839-3847
Cite this article:
Wei H, Ma X, Gu L, et al. Aerodynamic levitated laser annealing method to defective titanium dioxide with enhanced photocatalytic performance. Nano Research, 2016, 9(12): 3839-3847. https://doi.org/10.1007/s12274-016-1253-0

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Received: 18 June 2016
Revised: 15 August 2016
Accepted: 16 August 2016
Published: 10 September 2016
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016
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