Tungsten trioxide powder for liquid electrochromic device is a transition metal oxide with many special physical properties. This is because WO3 has a multi-phase transition and exhibits ferroelectricity. However, why is the chemical formula of tungsten trioxide usually written in the form of WO3-x rather than the form of WO3? The following are the answers from experts.

Tungsten oxide for production of liquid electrochromic device is an inorganic electrochromic material. In fact, there is another type of electrochromic material, that is, an organic electrochromic material. So, do you know the difference between inorganic electrochromic materials and organic electrochromic materials?

WO3, the most studied electrochromic material, may be prepared into an electrochromic film and then be used for assembling a liquid electrochromic device. And it is believed that tungsten trioxide is the best electrochromic material for practical use. Some experts have classified the existing electrochromic materials. For example, they divide the electrochromic material into cathode coloring materials in reduction process such as oxides of W, Mo, V, and Nb, and anode coloring materials in an oxidation process such as oxides of Ir, Rh, Ni, and Co.

Yellow tungsten oxide for the preparation of a liquid electrochromic device is the well known electrochromic material - tungsten trioxide, which is pale yellow in color. On the basis of summarizing the previous research results, some experts have prepared WO3 electrochromic film and TiO2 ion storage layer film by sol-impregnated pulling method and sol-electrophoretic deposition method, and they analyzed and discussed their microstructure and electrochromic properties.  And on this basis, a liquid electrolyte electrochromic device was assembled.