Journal of Solid State Electrochemistry

, Volume 16, Issue 11, pp 3499–3504 | Cite as

Some critical factors for photocatalysis on self-organized TiO2 nanotubes

  • Ning Liu
  • Indhumati Paramasivam
  • Min Yang
  • Patrik Schmuki
Original Paper
First Online:
Received:
Revised:
Accepted:

Abstract

In the present work, different intrinsic and extrinsic parameters are investigated that affect the photocatalytic activity of self-organized TiO2 nanotube layers. Particularly, the influence of annealing temperature and annealing atmosphere, the influence of different gas purging in the electrolyte, and the effect of applied voltage on the photocatalytic degradation rates of acid orange (AO7) are discussed. We find that the effect of the reducing gas atmosphere dominates over the anatase/rutile ratio in activating the nanotube layers. Moreover, we show that the effect of different gas purging (Ar and O2) of the electrolyte affects the reaction rate twofold: (1) by providing electron acceptor states and also by (2) a different change in the red–ox potential, i.e., the band bending in TiO2. By an external anodic voltage, the reaction rates can be increased drastically due to increased band bending. Nevertheless, the magnitude of the effect is also affected by the presence or absence of O2 in the electrolyte.

Keyword

Photocatalysis TiO2 nanotubes Crystalline phase Charge transfer 
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Notes

Acknowledgments

The authors acknowledge DFG, Engineering of Advanced Materials (Cluster of Excellence, University of Erlangen), for financial support and Ulrike Marten-Jahns for XRD measurements.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Ning Liu
    • 1
  • Indhumati Paramasivam
    • 1
  • Min Yang
    • 1
  • Patrik Schmuki
    • 1
  1. 1.Department of Materials Science WW4, LKOUniversity of Erlangen—NurembergErlangenGermany

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