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Understanding the effect of surface/bulk defects on the photocatalytic activity of TiO2: anatase versus rutile
Yan, JQ; Wu, GJ; Guan, NJ; Li, LD; Li, ZX; Cao, XZ;李卓昕; Cao XZ(曹兴忠)
2013
发表期刊PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷号15期号:26页码:10978-10988
摘要The sole effect of surface/bulk defects of TiO2 samples on their photocatalytic activity was investigated. Nano-sized anatase and rutile TiO2 were prepared by hydrothermal method and their surface/bulk defects were adjusted simply by calcination at different temperatures, i.e. 400-700 degrees C. High temperature calcinations induced the growth of crystalline sizes and a decrease in the surface areas, while the crystalline phase and the exposed facets were kept unchanged during calcination, as indicated by the characterization results from XRD, Raman, nitrogen adsorption-desorption, TEM and UV-Vis spectra. The existence of surface/bulk defects in calcined TiO2 samples was confirmed by photoluminescence and XPS spectra, and the surface/bulk defect ratio was quantitatively analyzed according to positron annihilation results. The photocatalytic activity of calcined TiO2 samples was evaluated in the photocatalytic reforming of methanol and the photocatalytic oxidation of alpha-phenethyl alcohol. Based on the characterization and catalytic results, a direct correlation between the surface specific photocatalytic activity and the surface/bulk defect density ratio could be drawn for both anatase TiO2 and rutile TiO2. The surface defects of TiO2, i.e. oxygen vacancy clusters, could promote the separation of electron-hole pairs under irradiation, and therefore, enhance the activity during photocatalytic reaction.
学科领域Chemistry; Physics
DOI10.1039/c3cp50927c
收录类别SCI
WOS记录号WOS:000320321600046
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被引频次:215[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224326
专题多学科研究中心
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Yan, JQ,Wu, GJ,Guan, NJ,et al. Understanding the effect of surface/bulk defects on the photocatalytic activity of TiO2: anatase versus rutile[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2013,15(26):10978-10988.
APA Yan, JQ.,Wu, GJ.,Guan, NJ.,Li, LD.,Li, ZX.,...&曹兴忠.(2013).Understanding the effect of surface/bulk defects on the photocatalytic activity of TiO2: anatase versus rutile.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,15(26),10978-10988.
MLA Yan, JQ,et al."Understanding the effect of surface/bulk defects on the photocatalytic activity of TiO2: anatase versus rutile".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 15.26(2013):10978-10988.
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