Tungsten oxide is an inorganic electrochromic material. But do you know what the electrochromic mechanism of an inorganic electrochromic material such as yellow tungsten oxide is? In fact, until today, experts have not fully figured out the discoloration mechanism of electrochromic materials, although they have done a lot of experimental and theoretical work. They also said that there are various theories even on the well-studied material, tungsten trioxide. The following is a Deb model for the discoloration of WO3 films.
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The Deb model, also known as the color center model, is the earliest proposed model. It can well explain the phenomenon that the electrochromic performance of WO3 in coloring state disappears after high temperature heating and fading in oxygen. In 1969, Deb fabricated an Au electrode composed of Au/a-WO3/Au on both sides of the evaporated amorphous tungsten trioxide film. When the external electric field was about 10^4V/cm, it was observed that the vicinity of the cathode began to colored to blue, and then gradually spread toward the anode, which was the first electrochromic device capable of operating at room temperature.
