In Situ Reduction of Tungsten Oxide

Because non-stoichiometric tungsten oxide has a certain reduction ability, precious metal particles can be directly deposited on the surface of tungsten oxide by utilizing the weak reducing ability of low-valent tungsten oxide and the reaction of reducing precious metal salt solution by in situ reduction.

In situ reduction of tungsten oxide is a simple and easy to use, mild conditions, without the help of reducing agent and stabilizer synthesis method. In situ reduction avoids the introduction of impurities, ensuring that the tungsten oxide and noble metal particle interface are clean. Although precious metal catalysts have a very good catalytic performance and stability in catalyzing many reactions, the preparation method is also a very critical factor from a practical application point of view.

Obviously using the commonly used method to carry noble metal particles on the surface of the carrier is required to pass UV lamp illumination, hydrogen reduction, etc., which takes a long time and is complicated to operate. Therefore, if the weak reducing ability of the defect oxide is utilized, the noble metal salt precursor is directly reduced. So fast, convenient synthesis of precious metal / tungsten oxide composite, will greatly reduce the manpower and resources investment.

Tungsten oxide material prepared by in situ reduction reaction, the existence of defects not only can affect the photocatalytic properties of the material, but also affect the conductivity of the material. Tungsten oxide as an n-type semiconductor, its electrical properties are mainly dependent on the concentration of free electrons in the conduction band, and defects can determine the concentration of free electrons in semiconductors, so the introduction of defects in the material on the performance of the material plays a very important role.

And research has shown that the introduction of defects in the negative electrode material of lithium-ion batteries can improve the electronic conductivity and accelerate lithium-ion migration in the battery. While providing space for the storage of lithium ions to improve the electrochemical properties of the material. Therefore, the unique crystal structure of tungsten oxide gives some unique properties with tremendous potential for applications in the fields of photocatalysis, supercapacitors, semiconductors and information storage.

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