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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F17%3APU121763" target="_blank" >RIV/00216305:26620/17:PU121763 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

<a href="/en/project/GJ15-23005Y" target="_blank" >GJ15-23005Y: Formation and properties of TiO2-based nanocolumn arrays via porous-alumina-assisted anodizing of doped titanium layers</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

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

ISBN

978-80-87294-71-0

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

669-674

Publisher name

TANGER Ltd.

Place of publication

Ostrava, Czech Republic

Event location

Brno

Event date

Oct 19, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000410656100116