Paper Title:
Fabrication and EIS Characterization of Titania Nanotube Arrays with Top Non-Tube Layer
  Abstract

TiO2 nanotube arrays were fabricated in the electrolyte containing 0.25wt% NH4F, 2.5vol% water and the ethylene glycol for various hours at room temperature by anodization of Ti foil in this paper. Some anodized specimens were annealed at 450°C for 3 hours. Electrochemical Impedance Spectroscopy (EIS) was employed to measure electrochemical parameters of anodized specimens. The morphology and crystalline structure of anodized products were characterized by Field Emission Scanning Electronic Microscopy (FESEM), X-ray Diffraction (XRD) and Transmission Electronic Microscopy (TEM). A non-tube layer appears on nanotube arrays with the increase in anodization time. Anodized TiO2 nanotube arrays have an amorphous structure, which transfers to anatase structure after annealing at 450°C. A new equivalent circuit R(CR(R(QR)(CR))) was proposed to fit EIS data. The results show that the charge transfer resistance at the electrode/electrolyte interface controls the electrochemical process of TiO2 nanotubes.

  Info
Periodical
Edited by
Enhou Han, Guanghong Lu and Xiaolin Shu
Pages
350-354
DOI
10.4028/www.scientific.net/MSF.689.350
Citation
X. L. Li, C. H. Xu, Z. L. Wen, W. J. Zhang, "Fabrication and EIS Characterization of Titania Nanotube Arrays with Top Non-Tube Layer", Materials Science Forum, Vol. 689, pp. 350-354, 2011
Online since
June 2011
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