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Fabrication and Photocatalytic Performance of Pt/TiO2 Nanotubes with High Activity
Author(s): 
Pages: 384-390
Year: Issue:  5
Journal: Nanotechnology and Precision Engineering

Keyword:  anodization methoddipping-pulling methodplatinum dopingtitania nanotubephotoelectrocatalysisvisible lightmethyl 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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