Doped tungstate is the use of chemical or physical means to embed particles on the main lattice of catalyst, introduce new electronic center and new charge into the lattice, form lattice defects and change the type of lattice, adjust or change the energy band structure of catalyst to affect the movement of photogenerated electrons and holes, and ultimately lead to the change of photocatalytic activity of catalyst.

In order to develop the substitute of lithium battery and get rid of the dependence of cobalt and nickel metal as much as possible, foreign researchers have developed a very promising defective tungsten oxide lithium battery. To some extent, lithium battery can reduce the consumption of expensive metal materials.

The narrow band gap (about 2.7eV) of WO₃ makes it have better absorption in visible light area, which is obviously superior to the traditional TiO₂ photocatalyst, but it also has the disadvantages of high carrier recombination rate and low visible light photocatalytic activity. The separation efficiency of photogenerated electron hole pair of WO₃ can be improved by the control of graphene recombination, crystal structure and morphology, and then the photocatalytic activity can be improved.

With the further development of China's reform and opening up, buildings are getting higher and higher. In these high-rise buildings, most of the windows are floor to floor windows to increase the indoor lighting. However, because these glasses generally do not have the function of adjusting the light, if the residents want to adjust the light, they usually install a group of curtains on the windows, and adjust the opening and closing of the windows to adjust the light. However, by installing curtains to adjust the light, not only the process increases and increases the cost, but also the users need to manually adjust the opening and closing of windows, which is not convenient.