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- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2016.11
- 수록면
- 59 - 75 (17page)
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Reduced or black TiO<SUB>₂-x</SUB> materials with oxygen-deficiency have been achieved by creating oxygen vacancies and/or defects at the surface using different methods.1 Fascinatingly, they exhibited an extended absorption in VIS and IR instead of only UV light with bandgap decrease from 3.2 (anatase) to ~1 eV. However, despite the dramatic enhancement of optical absorption in black TiO₂-x materials, they have failed to show expected visible light-assisted water splitting efficiency. This was ascribed to the high concentration of the surface defects and/or oxygen vacancies, considered as an electron donor to enhance donor density and improve the charge transportation in black TiO₂ can also act as charge recombination centers, which eventually decrease photocatalytic activity.3 Therefore, a black ot reducd TiO₂ material with optimized properties would be highly desired for visible light photocatalysis.
In this report, a new controlled magnesiothermic reduction has been developed to synthesize reduced black TiO<SUB>2-x</SUB> in the presence H₂/Ar for photocatalytic H2 production from methanol-water system.4 The material possesses an optimum band gap and band position, oxygen vacancies, and surface defects and shows significantly improved optical absorption in the visible and infrared region. The synergistic effects enable the reduced TiO<SUB>2-x</SUB> material to show an excellent hydrogen production ability along with long-term stability under the full solar wavelength range of light and visible light, respectively, in the methanol–water system in the presence of Pt as a co-catalyst. These values are superior to those of previously reported black TiO2 materials. On the basis of all the results, it can be realized that the outstanding activity and stability of the reduced of TiO<SUB>2-x</SUB> NPs suggest that a balanced combination of different factors like Ti<SUP>3+</SUP>, surface defects, oxygen vacancy, and recombination center is achieved along with optimized bandgap and band position during the preparation employing magnesiothermic reduction in the presence of H₂. The controlled magnesiothermic reduction in the presence of H₂ is one of the best alternative ways to produce active and stable TiO₂-based photocatalyst for H₂ production.
In this report, a new controlled magnesiothermic reduction has been developed to synthesize reduced black TiO<SUB>2-x</SUB> in the presence H₂/Ar for photocatalytic H2 production from methanol-water system.4 The material possesses an optimum band gap and band position, oxygen vacancies, and surface defects and shows significantly improved optical absorption in the visible and infrared region. The synergistic effects enable the reduced TiO<SUB>2-x</SUB> material to show an excellent hydrogen production ability along with long-term stability under the full solar wavelength range of light and visible light, respectively, in the methanol–water system in the presence of Pt as a co-catalyst. These values are superior to those of previously reported black TiO2 materials. On the basis of all the results, it can be realized that the outstanding activity and stability of the reduced of TiO<SUB>2-x</SUB> NPs suggest that a balanced combination of different factors like Ti<SUP>3+</SUP>, surface defects, oxygen vacancy, and recombination center is achieved along with optimized bandgap and band position during the preparation employing magnesiothermic reduction in the presence of H₂. The controlled magnesiothermic reduction in the presence of H₂ is one of the best alternative ways to produce active and stable TiO₂-based photocatalyst for H₂ production.
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