Journal
CHEMSUSCHEM
Volume 9, Issue 19, Pages 2841-2848Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201600854
Keywords
black TiO2; doping; hierarchical architecture; nanoplates; photocatalytic hydrogen evolution
Funding
- National Natural Science Foundation of China [21376065, 51672073, 21473051, 51372071]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2015014]
- Royal Academy of Engineering [NRCP/1415261]
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A facile two-step strategy was used to prepare black of hydrogenated/nitrogen-doped TiO2 nanoplates (NHTA) with a flowerlike hierarchical architecture. In situ nitriding and self-assembly was realized by hydrothermal synthesis using tripolycyanamide as a N source and as a structure-directing agent. After thorough characterization, it was found that the hydrogenation treatment did not damage the flower-like architecture but distorted the anatase crystal structure and significantly changed the band structure of NHTA owing to the increased concentration of oxygen vacancies, hydroxyl groups, and Ti3+ cations. Under AM1.5 illumination, the photocatalytic H-2 evolution rate on the black NHTA was approximately 1500 mu mol g(-1)h(-1), which was much better than the N-doped TiO2 nanoplates (approximate to 690 mu mol g(-1)h(-1)1). This improvement in the hydrogen evolution rate was attributed to a reduced bandgap, enhanced separation of the photogenerated charge carriers, and an increase in the surface-active sites.
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