Visible-Light-Driven Photocatalytic Hydrogen Generation on Nanosized TiO2-II Stabilized by High-Pressure Torsion
| Autor: | Hadi Razavi-Khosroshahi, Miho Yamauchi, Kaveh Edalati, Tatsumi Ishihara, Shintaro Ida, Makoto Arita, Hoda Emami, Masayoshi Fuji, Masashige Hirayama, Zenji Horita, Hidehisa Hagiwara, Etsuo Akiba |
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| Rok vydání: | 2016 |
| Předmět: |
Anatase
Materials science Annealing (metallurgy) 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology medicine.disease_cause Photochemistry 01 natural sciences Catalysis 0104 chemical sciences Rutile medicine Photocatalysis 0210 nano-technology Ultraviolet Visible spectrum Ambient pressure Hydrogen production |
| Zdroj: | ACS Catalysis. 6:5103-5107 |
| ISSN: | 2155-5435 |
| DOI: | 10.1021/acscatal.6b01482 |
| Popis: | Photocatalytic activity of pure TiO2 is limited to ultraviolet (UV) light due to the wide bandgap of anatase and rutile phases. The bandgap of high-pressure phases of TiO2 can theoretically coincide with visible light, but these phases are unstable at ambient pressure. In this work, the high-pressure TiO2-II (columbite) phase with large fractions of oxygen vacancies was stabilized by inducing plastic strain to anatase under 6 GPa. The material could absorb visible light as a consequence of bandgap narrowing by ∼0.7 eV. Formation of nanosized TiO2-II enhanced the hydrogen generation efficiency under visible light, and the efficiency improved after removing the oxygen vacancies by annealing. |
| Databáze: | OpenAIRE |
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