WO3 powder, more precisely, tungsten trioxide electrochromic film, can be used to assemble a liquid electrochromic device. As you may have known, the electrochromic phenomenon of tungsten trioxide materials was first discovered in tungsten oxide thin films. And such film is still the most promising electrochromic material now. Besides, it is the most studied and applied inorganic electrochromic material in smart windows. So, do you know what the electrochromic mechanism of tungsten trioxide is?

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The experts introduced that although the electrochromic mechanism of WO3 is more complicated, it can still be expressed by the following simple reaction formula:
(transparent) WO3+xM++xe-↔MxWO3 (dark blue)
Where 0