Facile fabrication, characterization, and enhanced photoelectrocatalytic degradation performance of highly oriented TiO2 nanotube arrays |
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Authors: | Qidong Zhao Xinyong Li Ning Wang Yang Hou Xie Quan Guohua Chen |
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Institution: | (1) Key Laboratory of Industrial Ecology and Environmental Engineering (MOE) and State Key Laboratory of Fine Chemical, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian, 116024, Liaoning, China;(2) Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China; |
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Abstract: | Highly ordered TiO2 nanotube arrays were successfully fabricated using ethanol and water mixture electrolytes (40 vol% ethanol and 0.2 wt% hydrofluoric
acid) by a facile electrochemical anodization method. The as-prepared nanotube arrays were grown perpendicular to the titanium
substrate with about 90 nm in diameter, 20 nm in wall thickness, and around 500 nm in length. The formation mechanism of the
samples is briefly discussed. A blue shift in the spectrum of UV–Vis absorption was observed with respect to a piece of the
sol–gel derived TiO2 film. Moreover, photocurrent response and photoelectrocatalytic degradation of methyl orange under ultraviolet light irradiation
were adopted to evaluate the photoelectrocatalytic properties of the TiO2 nanotube arrays. We demonstrate that the highly ordered TiO2 nanotube arrays possess much better photoelectrocatalytic activity than the sol–gel derived TiO2 film and good stability. |
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