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Ionics

, Volume 23, Issue 12, pp 3517–3531 | Cite as

Photocatalytic properties of Ta-doped TiO2

  • Mohammad A. Alim
  • Tadeusz Bak
  • Armand J. Atanacio
  • Mihail Ionescu
  • Brendan Kennedy
  • William S. Price
  • Johan Du Plessis
  • Maryam Pourmahdavi
  • Meifang Zhou
  • Allan Torres
  • Janusz NowotnyEmail author
Original Paper

Abstract

This work reports the effect of tantalum (0.1–1 at.% Ta) on the photocatalytic performance of TiO2 annealed at 1373 and 1673 K in air. It was shown that addition of tantalum resulted in an increase of photocatalytic activity of TiO2 for the specimens annealed at 1373 K. However, the activity of the Ta-doped TiO2 specimens annealed at 1673 K was reduced. The effect of tantalum on the photocatalytic performance at 1373 K was rationalised in terms of an increased concentration of titanium vacancies acting as the active surface sites, and increased charge transport. In this work, it was also shown that the band gap reduction due to tantalum incorporation had little effect on photocatalytic performance. The effect of annealing at 1673 K on photocatalytic activity was explained in terms of reduced surface segregation of tantalum.

Keywords

Defect chemistry Water oxidation Titanium dioxide 

Notes

Acknowledgement

The authors would like to thank AINSE Ltd. for providing financial assistance (Award—PGRA) to enable work on the surface characterisation of the specimens.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Mohammad A. Alim
    • 1
  • Tadeusz Bak
    • 1
  • Armand J. Atanacio
    • 2
  • Mihail Ionescu
    • 2
  • Brendan Kennedy
    • 3
  • William S. Price
    • 4
  • Johan Du Plessis
    • 5
  • Maryam Pourmahdavi
    • 6
  • Meifang Zhou
    • 7
  • Allan Torres
    • 4
  • Janusz Nowotny
    • 1
    Email author
  1. 1.Solar Energy Technologies, School of Computing, Engineering and MathematicsWestern Sydney UniversityPenrithAustralia
  2. 2.Institute of Environmental ResearchAustralian Nuclear Science and Technology OrganisationKirrawee, DCAustralia
  3. 3.School of ChemistryThe University of SydneySydneyAustralia
  4. 4.Nanoscale Organisation and Dynamics GroupWestern Sydney UniversityPenrithAustralia
  5. 5.School of Applied SciencesRMIT UniversityMelbourneAustralia
  6. 6.Faculty of Mining and MetallurgyAmirkabir University of TechnologyTehranIran
  7. 7.School of ChemistryThe University of MelbourneMelbourneAustralia

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