Tungsten oxide is an important transition metal oxide semiconductor with excellent electrochromic, photochromic and field emission properties. It has important application prospects in the fields of solar energy utilization, intelligent display, visible light photocatalysis, chemical sensing and so on.

With the development of modern science and technology, higher requirements are put forward for the preparation of tungsten, tungsten alloys and tungsten compounds. Tungstate is an important intermediate material in tungsten smelting, and its preparation and technological research have important value and significance.

Potassium phosphotungstate (K₃PW₁₂O₄₀) is a kind of Heteropoly acid. Potassium phosphotungstate, as a cathode active material in the molecular cluster of Heteropoly acid, has attracted much attention due to its reversible multi-electron redox reaction, which enables it to achieve a high specific capacity of 260 Ah/kg (ordinary Li₂CoO₂ lithium ion battery is 150 Ah/kg) and fast charge-discharge performance.

Photocatalysis can effectively convert light energy into chemical energy. Bi₂WO₆, as a new visible light-responsive photocatalytic material, has a narrow band gap (2.7eV), good photocatalytic activity under ultraviolet and visible light, and can effectively degrade organic pollutants in wastewater.