Detail publikace

Electrochemical characterization of pure and nitrogen-containing anodic TiO2 nanocolumn arrays

LEDNICKÝ, T. MOZALEV, A. BENDOVÁ, M.

Originální název

Electrochemical characterization of pure and nitrogen-containing anodic TiO2 nanocolumn arrays

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

TiO2 nanocolumn arrays are prepared via porous-anodic-alumina-assisted anodizing of Al/Ti or Al/TiNx layers in an oxalic acid electrolyte. The upper Al layer is anodized at 40 V to form a nanoporous anodic film; then the Ti or TiNx underlayer is re-anodized to 100 V. This leads to the growth of anodic TiO2 or N-containing TiO2 nanocolumns within the alumina pores, which are approx. 40 nm wide and 160 nm long. The crystallinity and doping degree of the nanocolumns are modified by the annealing in air or vacuum at 600°C. Cyclic voltammetry, electrochemical impedance spectroscopy, and Mott-Schottky analysis revealed n-type semiconducting properties of the N-doped nanocolumns whereas most of the undoped TiO2 nanocolumns exhibited dielectric behavior. The calculated doping concentration and the flat-band potential vary with the annealing conditions. This allows for controlled alteration of the depletion layer thickness in order to enhance the photoelectrochemical water-splitting ability of the films by improving photogenerated charge carrier separation and band-gap tuning. The N-containing nanocolumns appeared to possess trap states, as manifested by Fermi level pining, which may provide additional benefits for heterogeneous charge-carrier transport for water oxidation.

Klíčová slova

porous anodic alumina, anodizing, Mott-Schottky analysis, photoelectrochemical water splitting

Autoři

LEDNICKÝ, T.; MOZALEV, A.; BENDOVÁ, M.

Vydáno

30. 1. 2017

Nakladatel

TANGER Ltd.

Místo

Ostrava, Czech Republic

ISBN

978-80-87294-71-0

Kniha

Conference Proceedings of 8th International Conference on Nanomaterials - Research & Application (Nanocon 2016)

Edice

1st

Strany od

669

Strany do

674

Strany počet

6

BibTex

@inproceedings{BUT131160,
  author="Tomáš {Lednický} and Alexander {Mozalev} and Mária {Bendová}",
  title="Electrochemical characterization of pure and nitrogen-containing anodic TiO2 nanocolumn arrays
",
  booktitle="Conference Proceedings of 8th International Conference on Nanomaterials - Research & Application (Nanocon 2016)",
  year="2017",
  series="1st",
  pages="669--674",
  publisher="TANGER Ltd.",
  address="Ostrava, Czech Republic",
  isbn="978-80-87294-71-0"
}