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Nb-substituted TiO2 Nanosheet Exfoliated from Layered Titanate for photocatalysis

Published online by Cambridge University Press:  17 May 2011

Haiyan Song ,
Anja O. Sjåstad ,
Poul Norby  and
Helmer Fjellvåg
Haiyan Song*
Affiliation:
Department of Chemistry/SMN, University of Oslo, N-0315 Oslo, Norway
Anja O. Sjåstad
Affiliation:
Department of Chemistry/SMN, University of Oslo, N-0315 Oslo, Norway
Poul Norby
Affiliation:
Department of Chemistry/SMN, University of Oslo, N-0315 Oslo, Norway
Helmer Fjellvåg
Affiliation:
Department of Chemistry/SMN, University of Oslo, N-0315 Oslo, Norway
*
*Corresponding author: Tel.: +47 22855584; E-mail: [email protected]
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Abstract

Photoelectrochemical behavior and Photocatalytic decomposition of Methylene Blue were studied on (Nb,Ti)O2 nanosheets electrode and (Nb,Ti)O2 particles produced from nanosheets, respectively. A detailed characterization of the materials show that Nb-substitution suppresses the transition from anatase to rutile. Depending on the oxygen partial pressure during the transformation, the Nb-substitution into TiO2 provokes different defect situations and also electronic properties. 1% Nb-substitution can drasticly increase the photocurrent and photocatalytic activity of Ti0.9O2 due to the formation of new defects and electron traps that can promote the separation of photoinduced holes and electrons. However, high concentration of electron traps produced by heavy Nb-doping can serve as efficient recombination centers that caused loss of photocatalytic activity of the samples.

Keywords

NbphotochemicalTi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1352: Symposium GG – Titanium Dioxide Nanomaterials , 2011 , mrss11-1352-gg05-12
Copyright
Copyright © Materials Research Society 2011

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