Tungsten trioxide, as the first discovered and the most typical inorganic electrochromic material, has been deeply concerned by experts in many fields such as heat insulation. Well, as you may have known, the prepared film is known as an electrochromic film or a thermal insulating film, for applying in smart buildings. While what you may not know is that some experts have conducted comparative experiments on porous WO3 nanofilm and ordinary dense WO3 thin films.
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The experts found that: Compared with the conventional dense tungsten trioxide film, the tungsten trioxide film of nanoporous structure has a greatly improved electrochromic effect and a faster response speed. Also, the loss due to crystallization during ion injection process is reduced. But why tungsten trioxide film of nanoporous structure has better performance than conventional dense tungsten trioxide film? This is because the nanoporous tungsten trioxide film exhibits better reversibility during electrochemical cycling than the conventional dense WO3 film, and the ion injection space is greatly improved.
