Fabrication of TiO2-NTs and TiO2-NTs covered honeycomb lattice and investigation of carrier densities in I-/I-3(-) electrolyte by electrochemical impedance spectroscopy

Baran E., Yazici B.

APPLIED SURFACE SCIENCE, vol.357, pp.2206-2216, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 357
  • Publication Date: 2015
  • Doi Number: 10.1016/j.apsusc.2015.09.212
  • Journal Name: APPLIED SURFACE SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2206-2216
  • Çukurova University Affiliated: Yes

Abstract

The TiO2 nanotubes (NTs) were produced by one-step (1S) and two-step (2S) anodization technique. Effects of various anodization potential and times on the growth of TiO2-NTs were investigated by using Field Emission-Scanning Electron Microscopy (FE-SEM). The crystal structure of the electrodes was determined with X-ray powder diffractometry (XRD). The most suitable potential and time for TiO2-NTs obtained by both of anodization methods were found to be 21V and 4 h. XRD results indicated that 2S anodization technique provided better crystallinity. The electrochemical behaviors of the electrodes in acetonitrile electrolyte contained I-/I-3(-) were examined by utilizing electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) techniques. Electrochemical results showed that 2S anodization technique increases the carrier densities (ND) value of TiO2-NTs, and flat band potential is shifted by 50 mV to more negative values. (C) 2015 Elsevier B.V. All rights reserved.