Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (09): 2349-2353.doi: 10.3866/PKU.WHXB20100913

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Photogenerated Cathodic Protection Properties of a TiO2 Nanowire FilmPrepared by a Hydrothermal Method

ZHU Yan-Feng, DU Rong-Gui, LI Jing, QI Hai-Qing, LIN Chang-Jian   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2010-04-16 Revised:2010-05-28 Published:2010-09-02
  • Contact: DU Rong-Gui E-mail:rgdu@xmu.edu.cn
  • Supported by:

    The project was supported by the National High Technology Research and Development Programof China (2009AA03Z327) and National Key Technology R&DProgramof China (2007BAB27B04).

Abstract:

A TiO2 film was synthesized on the surface of a Ti substrate by a hydrothermal method, followed by acid treatment and calcination. The properties of the TiO2 film were characterized by scanning electron microscopy, X-ray diffraction, and ultraviolet-visible spectrophotometry. The photogenerated cathodic protection properties of the TiO2 film were investigated by electrochemical techniques. The corrosion performance of 403 stainless steel coupled to a TiO2 film photoanode in different solutions was evaluated by photogenerated potential and electrochemical impedance spectroscopy. The results showed that the TiO2 film was composed of many randomly-oriented anatase nanowires of about 10 nm in diameter. The TiO2 nanowire film prepared by the hydrothermal reaction at 150 ℃ for 6 h was used for the photogenerated cathodic protection of 403 stainless steel. When we coupled the steel in a 0.5 mol·L-1 NaCl solution to the TiO2 film photoanode in a mixed solution containing 0.3 mol·-1 Na2SO4 and 0.5 mol·L-1 HCOOH, its potential decreased by 545 mV. Additionally, the charge transfer resistance of the electrode reaction process for the coupled steel decreased considerably. The results also indicated that the HCOOH in the mixed solution improved the photogenerated cathodic protection of the TiO2 filmphotoanode.

Key words: Hydrothermal method, TiO2 nanowire film, Photogenerated cathodic protection, 403 stainless steel

MSC2000: 

  • O646