Journal
ELECTROCHIMICA ACTA
Volume 108, Issue -, Pages 525-531Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.06.149
Keywords
TiO2 nanotube arrays; N-doping; Photoelectrochemical performance; Photoelectrocatalytic activity; Visible-light
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Funding
- National Natural Science Foundation of China [21021002, 51072170]
- Natural Science Foundation of Fujian Province of China [2011J01057]
- NFFTBS [J1210014]
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N-doped TiO2 nanotube arrays (TiO2NTs) were prepared by hydrothermal treatment of the crystalline TiO2NTs, and characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectroscopy (DRS). The highly ordered TiO2NTs with an inner diameter of approximately 80 nm and a tube length of about 400 nm were obtained. XRD patterns showed that the TiO2 nanotube arrays before and after N doping were anatase. XPS analysis indicated that N was doped into the TiO2 lattice. A shift of the absorption edge to a low energy was observed from DRS. N-doped TiO2NTs electrode exhibited higher photoelectrochemical and photoelectrocatalytic activities than the undoped TiO2NTs electrode. The electrochemical impedance spectroscopy and photoluminescence spectra confirmed that doping N promoted the separation of the photogenerated electrons and holes. (C) 2013 Elsevier Ltd. All rights reserved.
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