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Journal of Solid State Electrochemistry

, Volume 8, Issue 10, pp 748–756 | Cite as

Electrochromic and structural characteristics of mesoporous WO3 films prepared by a sol-gel method

  • Renata Solarska
  • Bruce D. Alexander
  • Jan AugustynskiEmail author
Original Paper

Abstract

The preparation of electrochromic films of mesoporous tungsten trioxide from tungstic acid and tungstic hexaethoxide precursors with the addition of an organic stabiliser via a sol-gel method is reported. These films have been structurally characterised and both the film morphology and crystalline composition of the films were found to be significantly dependent on the temperature at which the films were annealed and upon the choice of precursor. Films annealed at lower temperatures consisted of amorphous and hexagonal tungsten trioxide, whereas films annealed above 500 °C comprised solely of monoclinic WO3. The electrochromic activity of the films was found to be equally dependent on method of preparation, and both the composition and the structure of the WO3 films were shown to clearly influence the colouration efficiency of the films.

Keywords

Tungsten trioxide Mesoporous film Electrochromism Raman spectroscopy Sol-gel synthesis 

Notes

Acknowledgements

This work was supported by the Swiss National Science Foundation and the Swiss Federal Office of Energy.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Renata Solarska
    • 1
  • Bruce D. Alexander
    • 1
  • Jan Augustynski
    • 1
    Email author
  1. 1.Département de Chimie Minérale, Analytique et AppliquéeUniversité de GenèveGenèveSuisse

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