Journal of Inorganic Materials ›› 2010, Vol. 25 ›› Issue (11): 1145-1149.DOI: 10.3724/SP.J.1077.2010.01145

• Research Paper • Previous Articles     Next Articles

Preparation of TiO2 Nanotube Arrays and Their Photoelectrochemical Properties

ZHANG Zhi-Yu, SANG Li-Xia, LU Li-Ping, BAI Guang-Mei, DU Chun-Xu, MA Chong-Fang   

  1. (Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)
  • Received:2010-02-26 Revised:2010-05-11 Published:2010-11-20 Online:2010-11-01
  • Supported by:

    National Nature Science Foundation of China(50806003); Nature Science Foundation of Beijing(3093018)

Abstract: TiO2 nanotube arrays were fabricated by anodization of the Ti foils in aqueous phosphoric acid and sodium fluoride solutions at 20V under ultrasonic field. The resulting nanotubes had the similar tube diameter (100nm) and the similar wall thickness (15-20nm). The tube lengths of the nanotubes anodized for 1h, 3h and 7h were 600, 1000, 900nm, respectively. Employing a 500W high-pressure mercury lamp as the light source, the open-circuit potential and the photocurrent, the flat band potential and the charge carrier densities of TiO2 nanotubes arrays annealed at  500℃ were analyzed by the open-circuit potential curves, the voltammetry curves and Mott-Schottky plots. The results showed that the photocurrent, the flat band potential, the charge carrier densities of the resultant samples reduced with the increase of oxidation time. The decrease of photocurrent density was more than that of the open-circuit potential. It can be ascribed to partial fracture and detachment of the nanotubes and the growth of the barrier layer with the inrease of anodization time, which led to the augment of the charge transfer resistance and the decrease of the charge carrier densities.

Key words: sonoelectrochemical, TiO2 nanotube arrays, photoelectrochemistry, charge transfer

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