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제118회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Highly Efficient Reduced TiO2-X Photocatalyst via Mg Reduction in H2/Ar

2016년 8월 27일 01시 05분 43초
MAT3-1 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 13시 : 30분
재료화학 - Current Trends in Nano Materials Chemistry
저자 및
DGIST 에너지시스템공학과, Korea
Recently, black TiO2-x materials were 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 a band gap decreases from 3.2 (anatase) to ~1 eV.2 However, despite the dramatic enhancement of optical absorption of black TiO2-x material, it fails to show expected visible light-assisted water splitting efficiency.1,3 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 TiO21,3 can also act as charge recombination centers, which eventually decreases photocatalytic activity.3 Therefore, a black TiO2 material with optimized properties would be highly desired for visible light photocatalysis. Herein, we report reduced of TiO2-x nanoparticles prepared in the presence Mg and H2/Ar for excellent photocatalytic H2 production from methanol-water system.4 On the basis of all the results, it can be realized that The outstanding activity and stability of our RT-0.5 suggest that a balanced combination of different factors like Ti3+, surface defects, oxygen vacancy, and recombination center is achieved along with optimized band gap and band position during the preparation employing magnesiothermic reduction in the presence of H2. And 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. REFERENCES 1. X. Chen et al., Chem. Soc. Rev. 44, 1861, (2015). 2. X. Chen et al., Science, 331, 746, (2011). 3. Y. H. Hu, Angew. Chem. Int. Ed., 51, 12410, (2012). 4. A. Sinhamahapatra et al., Energy Environ. Sci. 8, 3539, (2015).