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Photocatalytic performance of TiO2 nanocrystals with/without oxygen defects
Qi Kezhen1; Liu Shuyuan1; Qiu Meng3
2018
Source PublicationCHINESE JOURNAL OF CATALYSIS
ISSN0253-9837
Volume39Issue:4Pages:867-875
AbstractTo 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.
Other AbstractTo 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.
KeywordAUGMENTED-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
Indexed ByCSCD
Language英语
Funding Project[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 IDCSCD:6220175
Citation statistics
Cited Times:5[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/153188
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.上海市地震局
3.深圳大学
Recommended Citation
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.
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