Photocatalytic performance of TiO_2 nanocrystals with/without oxygen defects

作     者：Shu-yuan Liu Kezhen Qi Meng Qiu 刘书源;戚克振;仇萌

作者机构：Institute of Catalysis for Energy and EnvironmentCollege of Chemistry and Chemical EngineeringShenyang Normal UniversityShenyang 110034LiaoningChina Department of PharmacologyShenyang Medical CollegeShenyang 110034LiaoningChina Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060GuangdongChina 

出 版 物：《Chinese Journal of Catalysis》 (催化学报（英文）)

年 卷 期：2018年第39卷第4期

页      面：867-875页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China(51602207) the Doctoral Scientific Research Foundation of Shenyang Medical College(20174043) the Scientific Research Project for University Students of Shenyang Medical College(20160809) the Doctoral Scientific Research Foundation of Liaoning Province(201601149,20170520011) 

主　　题：TiO2 Defect Optical property Photocatalytic activity Density functional theory calculation 

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,*** as‐prepared TiO2 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 TiO2 synthesized by the sol‐gel method is less than that synthesized through the hydrothermal *** 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 *** photocurrent results confirm that this band‐gap narrowing enhances the photocurrent response under simulated solar light *** TiO2 with oxygen defects shows a higher photocatalytic activity for decomposition of a methylene blue solution compared with that of the perfect TiO2 *** photocatalytic mechanism is discussed based on the density functional theory calculations and photoluminescence spectroscopy measurements.