Tungsten Trioxide Optical Property

Photocatalysis is a new area which developed in recent this year, there are many semiconductor material is used as a photocatalyst for water decomposition. WO3 tungsten ions exist oxygen vacancies which will cause some parts W6 + ions restore to W5 + and oxygen vacancies affect tungsten oxide crystal type and level structure, thus affecting the photocatalytic properties. Non-stoichiometric WO3-X performance n-type semiconductor behavior, the band gap is 2.4 ~ 2.8ev, which also makes its photocatalytic properties better than other semiconductor materials. At wavelengths of UV radiation bigger than 330nm, Fe2 + / Fe3 + electrolyte system, the WO3catalytic powders photolysis rate is 1220umol / g / h. Under 420nm visible radiation, oxygen production rate has reached 320umol / g / h.

When WO3 tungsten ions due to oxygen vacancies causing some parts W6 + ions restore to W5 ions, the electrochromic effect occurs, the color of the material accordingly from light yellow to light green. Injecting external ions and electrons into WO3 materials so W6 + ions and W5 + can reversible. This applications can use in colored and achromatic area.

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