Tungsten Trioxide Hydrate Nano Film

The electrochromic phenomenon of the tungsten trioxide hydrate nano film can be measured in a three-electrode system. The WO3 film is a working electrode, the platinum wire with a diameter of 0.5mm is a counter electrode, the Ag/AgCl (3mol/L KCl) is a reference electrode, and the electrolyte is a 1mol/L lithium perchlorate/propylene carbonate solution.

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Experts said that from the UV-Vis transmittance curve of the prepared tungsten trioxide film in the colored state and the fading state, and the corresponding digital photos, the prepared film has two color states, including a transparent state and a blue state. In addition, the introduction of urea makes the film's light modulation range larger. It is mainly because urea can make the film more loose, which makes it have stronger ion storage capacity. Experts also said that in electrochromic application, it requires high transmission rate of fading state, and the transmittance of the fading state is too low to meet the practical application requirements.

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