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Preparation and photoelectrocatalytic activity of ZnO nanorods embedded in highly ordered TiO2nanotube arrays electrode for azo dye degradation

Authors
Journal
Journal of Hazardous Materials
0304-3894
Publisher
Elsevier
Publication Date
Volume
158
Identifiers
DOI: 10.1016/j.jhazmat.2008.01.118
Keywords
  • Tio2Nanotubes
  • Zno Nanorods
  • Photoelectrocatalytic
  • Photocatalytic
  • Methyl Orange

Abstract

Abstract In this article, the ZnO nanorods embedded in highly ordered TiO 2 nanotube arrays (ZnO/TiO 2 NR/Ts) electrodes were fabricated through two steps: (1) electrosynthesis of TiO 2 nanotube arrays (TiO 2 NTs) in HF solution by anodization method; (2) followed by cathodic electrodeposition of ZnO embedded in the TiO 2 nanotube arrays. The morphological characteristics and structures of ZnO/TiO 2 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/TiO 2 NR/Ts electrode was presented and the photocurrent was dramatically enhanced on the ZnO/TiO 2 NR/Ts electrode, comparing with that on bare TiO 2 NTs electrode. The photocatalytic and photoelectrocatalytic activity of ZnO/TiO 2 NR/Ts electrode was evaluated in degradation of methyl orange (MO) in aqueous solution.

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