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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 concentrated sodium chloride solution with ammonia 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 a semiconductor photocatalyst with an 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 the photocatalysis field. As photocatalytic technologies are considered one of the most effective ways to reduce environmental pollution and solve energy crises, they have attracted the interest of scientists and governments from all over.
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 technique is effective in improving the electron-hole seperation efficiency of photocatalysts. 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 most commonly used for photocatalysis because mWO3 has an excellent visible light response and a large bandwidth. 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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