Researching Progress of Tungsten Trioxide Electrochromic(2)

Tungsten oxide electrochromic films are widely used in modern society, and therefore improve the application of tungsten trioxide for widely plays an important role. And to improve the tungsten trioxide electrochromic the key point is to short the ions diffusion and transport time in the material. In addition to using the sol-gel method and magnetron sputtering method, with further research there are many methods for produce tungsten trioxide eletrochromic which has greatly improved. Such as using hot filament chemical vapor deposition method produce electrochromic films. Nano crystalline of tungsten trioxide films annealed at 300 ℃ air, the film primarily monoclinic crystal. Crystalline tungsten trioxide compared with conventional amorphous then performance are more stable in a sulfuric acid solution H + cycle and the usage rate can up to 3000 times. And nano tungsten trioxide films have a greater surface area, so the coloring of it will better than conventional amorphous oxide film. And using hydrothermal synthesis method can produce controlled morphology of tungsten trioxide nano particles, and then based on this using drop-casting method to produce tungsten trioxide films. Tungsten trioxide film in the lithium ion electrolyte compare with sulfuric acid solution the H+ will smaller than Li, higher power density, faster response times and greater coloration efficiency.

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