In-situ synthesis of TiO_2 nanostructures on Ti foil for enhanced and stable photocatalytic performance

作     者：Ke Wang Baodan Liu Jing Li Xiaoyuan Liu Yang Zhou Xinglai Zhang Xiaoguo Bi Xin Jiang 

作者机构：School of Materials Science and EngineeringUniversity of Science and Technology of China Shenyang National Laboratory for Materials Science (SYNL)Institute of Metal Research (IMR)Chinese Academy of Sciences (CAS) School of Renewable EnergyShenyang Institute of Engineering 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2019年第35卷第4期

页      面：615-622页

核心收录：

学科分类：081704[工学-应用化学] 081705[工学-工业催化] 07[理学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 070304[理学-物理化学(含∶化学物理)] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：partially supported by the National Natural Science Foundation of China (Nos.51702326,51472047) the Knowledge Innovation Program of Institute of Metal Research,Chinese Academy of Sciences with grants No.Y2NCA111A1 and Y3NCA111A1 the Youth Innovation Promotion Association,Chinese Academy of Sciences (Grant No.Y4NC711171) the Basic Science Innovation Program of Shenyang National Laboratory for Materials Science (Grant Nos.2017EP05 and 2017RP25) 

主　　题：Plasma electrolytic oxidation In-situ growth TiO2 Photocatalysis Ag co-catalyst 

摘      要：TiO_2 nanostructures with strong interfacial adhesion and diverse morphologies have been in-situ grown on Ti foil substrate through a multiple-step method based on conventional plasma electrolytic oxidation(PEO) technology, hydrothermal reaction and ion exchange process. The PEO process is critical to the formation of TiO_2 seeding layer for the nucleation of Na_2Ti_3O_7 and H_2Ti_3O_7 mediates that are strongly attached to the Ti foil. An ion exchange reaction can finally lead to the formation of H_2Ti_3O_7 nanostructures with diverse morphologies and the calcination process can turn the H_2Ti_3O_7 nanostructures into TiO_2 nanostructures with enhanced crystallinity. The morphology of the TiO_2 nanostructures including nanoparticles(NP), nanowhiskers(NWK), nanowires(NW) and nanosheets(NS) can be easily tailored by controlling the NaOH concentration and reaction time during hydrothermal process. The morphology, composition and optical properties of TiO_2 photocatalysts were analyzed using scanning electron microscope(SEM), X-ray diffraction(XRD), photoluminescence(PL) spectroscopy and UV–vis absorption spectrum. Photocatalytic tests indicate that the TiO_2 nanosheets calcined at 500?C show good crystallization and the best capability of decomposing organic pollutants. The decoration of Ag cocatalyst can further improve the photocatalytic performance of the TiO_2 nanosheets as a result of the enhanced charger separation efficiency. Cyclic photocatalytic test using TiO_2 nanostructures grown on Ti foil substrate demonstrates the superior stability in the photodegradation of organic pollutant, suggesting the promising potential of in-situ growth technology for industrial application.