Management on the location and concentration of Ti3+ in anatase TiO2 for defects-induced visible-light photocatalysis
Xin, XY (Xin, Xiaoye)1; Xu, T (Xu, Tao)1; Yin, J (Yin, Jiao)1; Wang, L (Wang, Lan)1; Wang, CY (Wang, Chuanyi)1; Wang, L
2015
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
Volume176Issue:10Pages:354-362
Abstract

The defect-induced "black-and-white" issue of TiO2 keeps this material under spotlight in the past decade. This work exhibits an oxidation-based synthesis of anatase TiO2 nanocrystals with various Ti3+ concentrations via a solvothermal process in combination with post-annealing at different temperatures. Strikingly, we found that by simply controlling the annealingtemperature, both concentration and location of the Ti3+ defects can be well managed to reside predominately in the subsurface/bulk regions of the post-annealed anatase TiO2 nanocrystals, a highly desired feature for stable visible light-active photocatalysis. The location and quantity of the Ti3+ in anatase nanocrystals pinpointed by X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) suggest that this temperature-mediated management of the location and concentration of Ti3+ defects is achieved through a Ti3+ reversible-diffusion mechanism. As an applicable verification, the sample attained by post-annealing treatment at 500 degrees C, which has the highest Ti3+ concentration predominately in the bulk region, exhibits a 30-fold enhancement in visible-light decomposition of methylene blue and 4 times improvement in the maximal transient photocurrent density compared with P25. This work reveals that managing the location and concentration of Ti3+ defects in TiO2 is a decisive process toward defects-induced visible-light photocatalysis.

KeywordAnatase Tio2 Nanocrystal Ti3++++ Defects-induced Photocatalysis Visible Light
DOI10.1016/j.apcatb.2015.04.016
Indexed BySCI
WOS IDWOS:000356549200037
Citation statistics
Cited Times:88[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/4885
Collection中国科学院特殊环境功能材料与器件重点试验室
Corresponding AuthorWang, L
Affiliation1.Chinese Acad Sci, Lab Environm Sci & Technol, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Peoples R China
2.Chinese Acad Sci, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.No Illinois Univ, Dept Chem & Biochem, De Kalb, IL 60115 USA
Recommended Citation
GB/T 7714
Xin, XY ,Xu, T ,Yin, J ,et al. Management on the location and concentration of Ti3+ in anatase TiO2 for defects-induced visible-light photocatalysis[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2015,176(10):354-362.
APA Xin, XY ,Xu, T ,Yin, J ,Wang, L ,Wang, CY ,&Wang, L.(2015).Management on the location and concentration of Ti3+ in anatase TiO2 for defects-induced visible-light photocatalysis.APPLIED CATALYSIS B-ENVIRONMENTAL,176(10),354-362.
MLA Xin, XY ,et al."Management on the location and concentration of Ti3+ in anatase TiO2 for defects-induced visible-light photocatalysis".APPLIED CATALYSIS B-ENVIRONMENTAL 176.10(2015):354-362.
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