Photocatalytic performance of TiO2 nanocrystals with/without oxygen defects

IMR OpenIR

	Photocatalytic performance of TiO2 nanocrystals with/without oxygen defects
	Qi Kezhen 1; Liu Shuyuan 1; Qiu Meng 3
	2018
发表期刊	CHINESE JOURNAL OF CATALYSIS
ISSN	0253-9837
卷号	39 期号:4 页码:867-875
摘要	To investigate the role of oxygen defects on the photocatalytic activity of TiO2, the TiO2 nanocrystals with/without oxygen defects are successfully synthesized by the hydrothermal and sol-gel methods, respectively. The as -prepared TiO2 nanocrystals with defects are light blue and the absorption edge of light is towards the visible light region (similar to 420 nm). Raman and X-ray photoelectron spectroscopy (XPS) measurements all confirm that the concentration of oxygen vacancies in the TiO2 synthesized by the sol-gel method is less than that synthesized through the hydrothermal route. The introduction of oxygen defects contributes to a new state in the band gap that narrows the band gap, which is the reason for the extension of light absorption into the visible light region. The photocurrent results confirm that this band-gap narrowing enhances the photocurrent response under simulated solar light irradiation. The TiO2 with oxygen defects shows a higher photocatalytic activity for decomposition of a methylene blue solution compared with that of the perfect TiO2 sample. The photocatalytic mechanism is discussed based on the density functional theory calculations and photoluminescence spectroscopy measurements. (C) 2018, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
其他摘要	To investigate the role of oxygen defects on the photocatalytic activity of TiO_2,the TiO_2 nanocrystals with/without oxygen defects are successfully synthesized by the hydrothermal and sol-gel methods,respectively.The as-prepared TiO_2 nanocrystals with defects are light blue and the absorption edge of light is towards the visible light region (~420 nm).Raman and X-ray photoelectron spectroscopy (XPS) measurements all confirm that the concentration of oxygen vacancies in the TiO_2 synthesized by the sol-gel method is less than that synthesized through the hydrothermal route.The introduction of oxygen defects contributes to a new state in the band gap that narrows the band gap,which is the reason for the extension of light absorption into the visible light region.The photocurrent results confirm that this band-gap narrowing enhances the photocurrent response under simulated solar light irradiation.The TiO_2 with oxygen defects shows a higher photocatalytic activity for decomposition of a methylene blue solution compared with that of the perfect TiO_2 sample.The photocatalytic mechanism is discussed based on the density functional theory calculations and photoluminescence spectroscopy measurements.
关键词	AUGMENTED-WAVE METHOD VISIBLE-LIGHT CO2 REDUCTION ANATASE TIO2 001 FACETS NANOSHEETS PHASE WATER ZNO PHOTOLUMINESCENCE TiO2 Defect Optical property Photocatalytic activity Density functional theory calculation
收录类别	CSCD
语种	英语
资助项目	[National Natural Science Foundation of China] ; [Doctoral Scientific Research Foundation of Shenyang Medical College] ; [Scientific Research Project for University Students of Shenyang Medical College] ; [Doctoral Scientific Research Foundation of Liaoning Province]
CSCD记录号	CSCD:6220175
引用统计	被引频次：21[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/153188
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.上海市地震局 3.深圳大学
推荐引用方式 GB/T 7714	Qi Kezhen,Liu Shuyuan,Qiu Meng. Photocatalytic performance of TiO2 nanocrystals with/without oxygen defects[J]. CHINESE JOURNAL OF CATALYSIS,2018,39(4):867-875.
APA	Qi Kezhen,Liu Shuyuan,&Qiu Meng.(2018).Photocatalytic performance of TiO2 nanocrystals with/without oxygen defects.CHINESE JOURNAL OF CATALYSIS,39(4),867-875.
MLA	Qi Kezhen,et al."Photocatalytic performance of TiO2 nanocrystals with/without oxygen defects".CHINESE JOURNAL OF CATALYSIS 39.4(2018):867-875.