Tungsten oxide, as a semiconductor sensitive material with great research and application prospects, has been widely used to detect various toxic and dangerous gases (such as NO₂, NH₃, etc.). However, the working temperature of tungsten oxide is relatively high (150 ~250 ℃), so scientists and technicians have been devoting themselves to the research of reducing the working temperature of tungsten oxide.

Tungsten trioxide (WO₃) is an important photocatalytic semiconductor material, which is widely used in the field of semiconductor heterogeneous photocatalytic technology to solve industrial wastewater and domestic wastewater pollution treatment.

Bismuth tungstate (Bi2WO6) photocatalyst is considered as a potential excellent visible light photocatalytic material because of its unique electronic structure, excellent visible light absorption ability and high organic degradation ability.

With the rapid development of global economy and the increasing demand for energy and resources, people pay more attention to and invest in the search for renewable and clean energy. Hydrogen energy, as a clean renewable energy, has the advantages of high combustion value, pollution-free, convenient storage and transportation. The photocatalytic decomposition of water to produce hydrogen using solar energy, which has huge reserves and no pollution, provides an ideal method to solve this problem, and has become a hot spot of scientific research.