Journal
MATTER
Volume 5, Issue 1, Pages 206-218Publisher
CELL PRESS
DOI: 10.1016/j.matt.2021.10.027
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Funding
- National Natural Science Foundation of China [12034002, 51872116, 52025025, 52072400]
- Natural Science Funds for Distinguished Young Scholar of Heilongjiang Province [JC2018004]
- Excellent Young Foundation of Harbin Normal University [XKYQ201304]
- Project for Self-innovation Capability Construction of Jilin Province Development and Reform Commission [2021C026]
- Jilin Province Science and Technology Development Program [20190201233JC]
- Program for JLU Science and Technology Innovative Research Team (JLUSTIRT) [2017TD-09]
- Fundamental Research Funds for the Central Universities
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The introduction of hydrogen into TiO2 greatly enhances its photocatalytic properties, leading to a 60 times enhancement of photocatalytic hydrogen evolution activity. Hydrogenated TiO2 with switchable defects is synthesized through a one-step wet-chemistry method and controlled annealing. The obtained hydrogenated TiO2 exhibits improved visible light absorption and efficient separation of photogenerated carriers, resulting in significantly enhanced photocatalytic activity.
Hydrogen has a remarkably flexible chemistry in oxides. We show that the introduction of H into simple TiO2 leads to greatly enhanced photocatalytic properties, and specifically yields a 60 times enhancement of photocatalytic hydrogen evolution activity over commercial rutile. The hydrogenated TiO2 (H-TiO2) is synthesized by a new one-step wet-chemistry approach yielding switchable defect via controlled annealing. As-prepared H-TiO2 has Ti-H bonds in the lattice from replacement of oxygen by hydrogen atoms. The Ti-H bonds are converted to oxygen vacancies by loss of H2O with Ar annealing. Oppositely, Ti-H defects are healed by Ti-O with O-2 annealing. The strongly enhanced photocatalytic activity is associated with increased visible light absorption and effective separation of photogenerated carriers. This work provides a new and powerful approach for the preparation of hydrogenated titanium dioxide with switchable defect control, and striking improvement of photocatalytic activity.
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