What is tungsten Oxide?
Tungstentrioxide has a powder crystal of light yellow triclinic color. If the temperature rises above 740degC it becomes orange tetragonal powder crystals that return to its original state upon cooling. It is stable when in air with a melting and boiling point above 1750degC.
The most stable tungsten oxide is tungsten trioxide. 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 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 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 a lot of 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. It is currently the most efficient technique to increase electron-hole seperation efficiency in 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 also widely 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 valence and conduction bands of hWO3 have a lower value than those of M-WO3. Improve the photocatalytic activity of WO3.
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