Electrochemical method for synthesis of a ZnFe <inf>2</inf>O <inf>4</inf>/TiO <inf>2</inf> composite nanotube array modified electrode with enhanced photoelectrochemical activity
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An electrode with intimate and well-aligned ZnFe 2O 4/TiO 2 composite nanotube arrays is prepared via electrochemical anodization of pure titanium foil in fluorine-containing ethylene glycol, followed by a novel cathodic electrodeposition method. The deposition of ZnFe 2O 4 is promoted in the selfaligned, vertically oriented TiO 2 nanotube arrays but minimized at the tube entrances. Thus, pore clogging is prevented. Environmental scanning electron microscopy, energy-dispersive X-ray spectra, high-resolution transmission electron microscopy, X-ray diffraction patterns, and X-ray photoelectron spectroscopy indicate that the as-prepared samples are highly ordered and vertically aligned TiO 2 nanotube arrays with ZnFe 2O 4 nanoparticles loading. The TiO 2 nanotubes are anatase with the preferential orientation of <101> plane. Enhanced absorption in both UVand visible light regions is observed for the composite nanotube arrays. The current-voltage curve of ZnFe 2O 4-loaded TiO 2 nanotube arrays reveals a rectifying behavior. The enhanced separation of photoinduced electrons and holes is demonstrated by surface photovoltage and photocurrent measurements. Meanwhile, the photoelectrochemical investigations verify that the ZnFe 2O 4/TiO 2 composite nanotube array modified electrode has a more effective photoconversion capability than the aligned TiO 2 nanotube arrays alone. In addition, the photoelectrocatalytic ability of the novel electrode is found enhanced in the degradation of 4-chlorophenol. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Synthesis and photoinduced charge-transfer properties of a ZnFe 2O4-sensitized TiO2 nanotube array electrodeLi, Xin Yong; Hou, Y.; Zhao, Q.; Chen, G. (2011)TiO2 nanotube arrays sensitized with ZnFe2O 4 nano-crystals were successfully fabricated by a two-step process of anodization and a vacuum-assistant impregnation method followed by annealing. The sample was studied by an ...
Electrochemically assisted photocatalytic degradation of 4-chlorophenol by ZnFe<inf>2</inf>O<inf>4</inf>-modified TiO<inf>2</inf> nanotube array electrode under visible light irradiationHou, Y.; Li, Xin Yong; Zhao, Q.; Quan, X.; Chen, G. (2010)A well-aligned ZnFe2O4/TiO2 composite nanotube array (ZnFe2O4/TiO2-NTs) electrode with visible-light activity was successfully prepared using a two-step electrochemical process of anodization and a novel cathodic ...
Photoeletrocatalytic activity of a Cu <inf>2</inf>O-loaded self-organized highly oriented TiO <inf>2</inf> nanotube array electrode for 4-chlorophenol degradationHou, Y.; Li, Xin Yong; Zou, X.; Quan, X.; Chen, G. (2009)Differently sized Cu 2O nanoparticles have been assembled photocatalytically on the surface of self-organized highly oriented TiO 2 nanotubes obtained by anodization of a Ti sheet in fluoride- containing electrolytes. ...