Journal
CHEMSUSCHEM
Volume 9, Issue 6, Pages 617-623Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201501558
Keywords
charge-transfer; hydrogen generation; photocatalyst; titania; topotactic transformation
Funding
- Advanced Characterization Nanotechnology Platform
- Innovative Project for Advanced Instruments, Renovation Center of Instruments for Science Education and Technology, Osaka University
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government
- [25220806]
- [25288035]
- Grants-in-Aid for Scientific Research [25288035] Funding Source: KAKEN
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With the aid of breakthroughs in nanoscience and nanotechnology, it is imperative to develop metal oxide semiconductors through visible light-driven hydrogen generation. In this study, TiOF2 was incorporated as an n-type F-dopant source to TiO2 mesocrystals (TMCs) with visible-light absorption during the topotactic transformation. The crystal growth, structural change, and dynamic morphological evolution, from the initial intermediate NH4TiOF3 to HTiOF3, TiOF2, and F-doped TMCs, were verified through insitu temperature-dependent techniques to elucidate the doping mechanism from intermediate TiOF2. The visible-light efficiencies of photocatalytic hydrogen were dependent on the contents of the dopant as compared with the pure TMC and a controled reference. Using femtosecond time-resolved diffuse reflectance spectroscopy, the charge-transfer dynamics were monitored to confirm the improvement of charge separation after doping.
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