WO3 nano particles may be applied for the production of a new energy efficient building glass. According to experts, the raw material tungsten trioxide nano powder is an inorganic electrochromic material, and is a cathode electrochromic material, which is colorless in a high-valent oxidation state and colored in a low-cost reduction state. Also, there are other cathode electrochromic materials - Mo, Ti, and the like.
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The inorganic electrochromic material has an unstable electronic layer structure, and can undergo reversible conversion between different valence states when accepting or losing electrons, and realize color change by valence state rise and fall of metal cations. The transition metal oxides are mainly WO3, NiO, TiO2, V2O5, and MoO3, etc. According to the different redox mode of the colored state, the inorganic electrochromic material is further divided into a cathode electrochromic material and an anode electrochromic material. Among them, the anode electrochromic material is an electrochromic material which is colored in a high-valent oxidation state and fades in a low-cost reduced state. Common anode electrochromic materials mainly include oxides of Ni, Mn, Ir and the like.
