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Development of mesoporous tungsten oxide WO3 thin films for electrochromic applications

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  • Physical
  • Chemical
  • Mathematical & Earth Sciences :: Chemistry [G01]
  • Physique
  • Chimie
  • Mathématiques & Sciences De La Terre :: Chimie [G01]


PowerPoint Presentation 400oC 300oC Films become crystalline at temperatures above 400oC. At this temperature, tungsten oxide is converted into the triclinic structure according to the JCPDS no. 01-073-8498. Funded by: Alexander S. Onassis Public Benefit Foundation (2011-2012) Bourse d’ excellence IN WBI (2012-2013) 10 20 30 40 50 602θ I 300oC 350oC 400oC J. Sol-Gel Sci Technol (2010) 54:19-28 Pores’ organization is retained until 350oC. After this temperature, crystallization begins. The material is subjected to strains and mass rearrangement which lead to the destruction of mesopores. Development of mesoporous tungsten oxide WO3 thin films for electrochromic applications Dafni Chatzikyriakou, Jessica Denayer, Pierre Colson, Catherine Henrist, Rudi Cloots Group of Research in Energy and Environment from Materials (GreenMat), University of Liege B6, B-4000 Liege, Belgium Electrochromism is the ability of some materials to change their optical properties in a reversible and persistent way under the action of a voltage pulse. This phenomenon finds applications in the area of smart windows and subsequently it contributes to building energy savings. The reaction that takes place between the colored (right part) and bleached state (left part) is : WO3 + xLi ++ xe- LixWO3 In this project we combine the electrochromic properties of tungsten oxide films and the surface properties of mesoporosity. Large interface between the film and the electrolyte and the formation of small domains which decrease the diffusion length inside the solid, are some of the advantages of mesoporous materials. This will

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