Some experts have adopted hydrothermal method to prepare tungsten trioxide layered nanosheet on the FTO conductive glass. And experts have improved the electrochromic properties (mainly related to ion diffusion coefficient and diffusion pathway) of tungsten oxide electrochromic nano films by controlling the structure and morphology of nano grain size tungsten oxide.
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Experts say that the nano electrochromic film of tungsten trioxide nano particles is able to exhibit excellent electrochromic properties due to the good contact between the porous structure of the WO3 nanosheets and the conductive substrate. It makes ion diffusion easier and provides a larger active surface area for charge transfer reactions. The response time of coloring and fading is 5.2 and 2.2 s, respectively. The difference in visible light transmittance between the colored state and the fading state can reach 62%. The coloring efficiency is 55.6cm2V/C. And the stability is maintained after 3000 cycles.
