Preparation and photoelectrocatalytic activity of ZnO nanorods embedded in highly ordered TiO₂ nanotube arrays electrode for azo dye degradation

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• 作者：Zhonghai Zhang ; Yuan Yuan ; Linhong Liang ; Yuxiao Cheng ; Guoyue Shi ; Litong Jin
• 关键词：TiO₂ nanotubes ; ZnO nanorods ; Photoelectrocatalytic ; Photocatalytic ; Methyl orange
• 刊名：Journal of Hazardous Materials
• 出版年：2008
• 出版时间：30 October 2008
• 年：2008
• 卷：158
• 期：2-3
• 页码：517-522
• 全文大小：751 K

文摘

In this article, the ZnO nanorods embedded in highly ordered TiO₂ nanotube arrays (ZnO/TiO₂ NR/Ts) electrodes were fabricated through two steps: (1) electrosynthesis of TiO₂ nanotube arrays (TiO₂ NTs) in HF solution by anodization method; (2) followed by cathodic electrodeposition of ZnO embedded in the TiO₂ nanotube arrays. The morphological characteristics and structures of ZnO/TiO₂ NR/Ts electrodes were examined by field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD) analysis, and UV–vis spectra. The linear-sweep photovoltammetry response on the ZnO/TiO₂ NR/Ts electrode was presented and the photocurrent was dramatically enhanced on the ZnO/TiO₂ NR/Ts electrode, comparing with that on bare TiO₂ NTs electrode. The photocatalytic and photoelectrocatalytic activity of ZnO/TiO₂ NR/Ts electrode was evaluated in degradation of methyl orange (MO) in aqueous solution.