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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 tetragonal 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 not soluble with water or 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 WO3 is the high photo-generated electron hole recombination on its surface. This limits the industrial use of yellow tungsten dioxide in the 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 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 found that mWO3 has an excellent visible light response and bandwidth, making it a popular choice in photocatalysis. 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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