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Cobalt Oxide Modified Highly Ordered TiO2 Nanotube Arrays: Enhanced Visible Light Photoelectrochemical Properties

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Highly aligned TiO2nanotube arrays (NTs) modified by cobalt oxide nanoparticles were prepared by one-step electrochemical anodization of Ti foil using Co(NO3)2˙6H2O as cobalt source and subsequent thermal treatment in air at 450 °C for 2 h. Their morphology, structure and optical properties were investigated by field emission scanning electron microscope, energy dispersion spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and UV-visible reflectance spectroscopy. The photoelectrochemical properties were investigated by the photocurrent response under the irradiation of the simulated sunlight at room temperature. The results showed that the photocurrent response of the TiO2 NTs modified by cobalt oxide is higher than that of the unmodified TiO2 NTs, which may be ascribed to faster electron transport and more efficient separation of the photogenerated holes and electrons in the cobalt oxide anchored TiO2 NTs. The results presented here demonstrate that the TiO2 NTs modified by cobalt oxide might have an important application in solar cells or photocatalysis owing to its efficient utilization of visible light.
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Keywords: COBALT OXIDE; MODIFIED; PHOTOELECTROCHEMICAL PROPERTY; TITANIA NANOTUBE ARRAYS

Document Type: Research Article

Publication date: September 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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