Semiconductor Photocatalytic Material-Yellow Tungsten Oxide

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What is tungsten Oxide?

Tungstentrioxide has a powder crystal of light yellow triclinic color. 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.

The most stable type of tungsten dioxide 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 common 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 as an effective way to reduce environmental pollution and the energy crisis, they have attracted widespread attention.

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 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 mainly used for photocatalysis because mWO3 has an excellent visible light response and a large bandwidth. It is also possible to create monoclinic/hexagonal homogeneous junctions in WO3 materials (mWO3/hWO3) because the valence and conduction bands of hWO3 are smaller than those of MWO3. Improve the photocatalytic activity of WO3.

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