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What is tungsten Oxide?
Tungstentrioxide has a powdery light yellow triclinic crystal. If the temperature rises above 740degC it becomes orange tetragonals crystals that return to its original state upon cooling. It is stable when in air with a melting and boiling point above 1750degC.
Tungsten trioxide, the most stable type of tungsten dioxide, is a solid. It is insoluble with water and other inorganic acid except hydrofluoric. It can be dissolved into hot sodium hydroxide and ammonia solution to form soluble, tungstate. If the temperature exceeds 650 degrees, H2 can be used to reduce it and C can be used to decrease it.
Yellow (tungsten oxide) is a typical material of the n type semiconductor. It is considered to be a photocatalytic semiconducting material that has excellent development potential because of its high solar energy usage, good visible light responsiveness, and strong light corrosion resistant. It has been widely applied in the fields such as photolysis of water for hydrogen production and catalytic degrading of organic pollutants.
One of the factors that affects the photocatalytic properties of yellow tungsten dioxide is the high photo-generated electron hole recombination on the surface. This has a negative impact on its industrial applications in photocatalysis. As photocatalytic technologies are considered as an effective way to reduce environmental pollution and the energy crisis, they have attracted attention from scientists and governments of different countries.
The photocatalytic performance and efficiency of yellow tungsten dioxide can be improved by a method.
Researchers have proposed an effective method to enhance the photocatalytic efficiency of yellow titanium oxide by building a heterogeneous intersection. This is one of many effective techniques for improving the efficiency of photocatalysts in separating electrons from holes. The yellow tungsten dioxide photocatalyst exhibited higher photocatalytic performance than a monocrystalline phase during the photocatalytic destruction of hydrogen production in aquatic environments and pollutants. In recent years people have succeeded in constructing heterogeneous intersections, such as WO3/WO3*H2O.
WO3 has many different crystal structures. These include orthorhombic phase, hexagonal phase, monoclinic and tetragonal phases. It is used widely in photocatalysis because mWO3 has an appropriate bandwidth and good visible-light response. It is also possible to build monoclinic/hexagonal homogeneous junctions in WO3 materials (m-WO3/hWO3) because the conduction and valence bands are lower for h-WO3. Improve the photocatalytic activity of WO3.
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