A new sight on hydrogenation of F and N-F doped {001} facets dominated anatase TiO2 for efficient visible light photocatalyst

• Published in: Applied catalysis. B, Environmental Environmental, 2012-10, Vol.127, p.28-35
• Main Authors: Wang, Wei, Lu, Chunhua, Ni, Yaru, Su, Mingxing, Xu, Zhongzi
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Doping; Exact sciences and technology; General and physical chemistry; Oxygen vacancy; Photochemistry; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Ti3; Visible light photocatalysis; {0 0 1} facets
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2012.08.002

. [Display omitted] ► F will substitute the O during the preparation of {001} facets dominated TiO2. ► N and F located in TiO2 can be removed completely by hydrogenation. ► Different Ti3+ and Ovac will locate by N-F doping and hydrogenation. ► Disorder structure and defect energy state belt enhance the photoactivity. Nonmetal doping such by N and F has been studied widely to enhance the visible light photoactivity of TiO2. Recently, hydrogenation of pure and N doped TiO2 is also well studied by theoretical calculations. However, little experimental evidence is known about the nature of the hydrogenation effect played on F and N-F doped anatase TiO2. In this study, hydrogenation of F and N-F doped {001} facets dominated anatase TiO2 were prepared by annealing the doped photocatalysts in the 10-bar H2 atmosphere. Electron paramagnetic resonance (EPR) spectra confirmed the presence of different coordinated Ti3+ and oxygen vacancies located in the hydrogenated N and N-F doped TiO2 as a result of removing the already located N and F species. The visible-light photocatalytic activity of hydrogenated N-F doped TiO2 was significantly enhanced because of the formation of defect energy state belts and disorder structures. This study gives a new sight on the interaction between H and N, F species in doping TiO2 and developing efficient visible light photocatalyst by hydrogenation.