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Fabrication and Photocatalytic Performance of Pt/TiO2 Nanotubes with High Activity
Author(s): Li Yunlin, Zhang Chao, Wang Jing, Zhou Lei, Liang Guangqiang, Zhou Minghua, Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education, Nankai University, Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, Nankai University, College of Environmental Science and Engineering, Nankai University, Department of Student Affairs, Tianjin University
Pages: 384-
390
Year: 2013
Issue:
5
Journal: Nanotechnology and Precision Engineering
Keyword: anodization method; dipping-pulling method; platinum doping; titania nanotube; photoelectrocatalysis; visible light; methyl orange;
Abstract: The Pt /TiO2nanotube( Pt / TNT) arrays electrode was prepared using electrochemical anodization and dipping-pulling method. The properties of the composite electrode were characterized by field emission scanning electron microscopy( FESEM),X-ray diffraction( XRD),X-ray photoelectron spectroscopy( XPS),and UV-Vis diffuse reflectance spectroscopy( UV-Vis DRS). The photoelectrochemical properties,photoelectrocatalytic activity and stability of Pt / TNT arrays electrode for the degradation of methyl orange were investigated. The results indicate that the uniform dispersion of platinum successfully broadens the absorption spectrum of TNT arrays electrode to visible light region and the photocurrent density of Pt / TNT arrays electrode is 18 times that of TNT arrays electrode. The degradation of methyl orange on Pt / TNT arrays electrode conforms to pseudo first-order kinetics and the reaction rate constant is about3 times that of TNT arrays electrode. The enhanced photocatalysis is ascribed to the higher surface volume ratio,the more effective separation and migration for the photogenerated electron-hole pairs,and an improved UV light response because of nanotubular structures and the Schottky barriers between Pt and TiO2.
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