Tungsten Oxide Electrochromic

Nowadays, tungsten oxide (WO_X) electrochromic is the most widely studied. Electrochromic WO_X film is reversed from a bleached state (colorless) to a colored state (dark-blue) to produce tungsten bronze (MαWO_X) by intercalating both ions and electrons according to the intercalation reaction:  WO_X+αM++αe-←→MαWO_X. However, electrochromic WO_X films have poor chemical stability in an acidic electrolyte solution (i.e., a protonic H⁺ ion ^– containing electrolyte) during electrolyte cycling due to the film’s dissolution in the H2SO4 electrolytes solution, therefore, the non-protonic lithium-containing electrolytes are generally used to assure the reversible Li+ intercalation into and deinteralation out from tungsten oxide films. To enhance the lithium eletrochromic properties of WO_X, several dopants such as Au crystals, TiO_X, MoO_x, FeO_X and carbon nanotubes have been added into WO_X films.

After adding dopants it can enhance tungsten oxide films’ lithium electrochromic properties which are under an atmosphere pressing plasma jet. 


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