WO3 Applied for Liquid Electrochromic Device

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.

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In fact, in recent years, many transition metal oxides or derivatives thereof have been found to have electrochromic properties. So why do these transition metal oxides have electrochromic properties? This is because the electronic layer structure of the metal ions in the transition metal oxide is unstable, and the valence state undergoes a reversible transition under certain conditions, forming a state in which mixed valence ions coexist, and the color will change as the valence and concentration of the ion change.

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