In 1972, Honda and Fujishima successfully used n-TiO₂ electrode to produce hydrogen from water by photolysis of solar energy, which made people realize the application prospect of Photoelectrochemical conversion of solar energy to electric energy and chemical energy. At the same time, this technology is applied to solve the problem of dye wastewater and other industrial wastewater.

Electrochromism refers to the phenomenon that the optical properties (transmissivity, reflectance or absorptivity) of materials in the ultraviolet, visible or (and) near infrared region produce stable and reversible changes under the action of external electric field, which shows reversible changes of color and transparency in appearance.

Bactericide wastewater is a typical kind of toxic and harmful industrial wastewater which is difficult to degrade, such as wastewater from pesticide industry and some chemical industry. Because of the high concentration of bactericide in wastewater, it can kill and inhibit the growth of microorganisms. On the other hand, most of the organic fungicides are polycyclic or heterocyclic organic compounds with poor biodegradability. Therefore, it is difficult to treat the bactericide wastewater directly by biotechnology.

Polluted wastewater and anti biotic wastewater are typical toxic and harmful industrial wastewater that are difficult to degrade, such as wastewater from pesticide industry and wastewater from some chemical industry. Because of the high concentration of fungicides in wastewater, which can kill and inhibit the growth of microorganisms, it is difficult to treat this kind of wastewater directly by biotechnology.

Lubrication of aircraft tail is very important. With good lubricating performance and excellent resistance to high temperature and extreme pressure, tungsten disulfide has high application value in aircraft tail lubrication.

The preparation of composite of tungsten disulfide and graphene involves the four steps: the preparation of graphene oxide, the preparation of RGO, the preparation of tungsten disulfide and the preparation of composite of WS₂ and RGO. This is a simple preparation method with low cost.

With good lubricating performance and excellent substrate adhesion, WS₂ can be applied in catadioptric telescope lubrication. The lens tube and other important parts can be lubricated with this material to ensure the high efficiency and stability of the celestial observation.

With good lubricating performance, tungsten disulfide can be used in equatorial mount lubrication. The use of this instrument is usually accompanied by a lot of friction and energy loss. So its parts have to be lubricated for the stable observation.

Tungsten disulfide can be used to lubricate the relevant parts of the reflecting telescope. And Newtonian telescope is a main kind of reflecting telescope. The excellent observation ability of the telescope depends on the lubrication and maintenance of the parts.

Tungsten disulfide has great application value in the lubrication of refracting telescope, which is a main type of astronomical telescope. The parts of refracting telescope can be lubricated with tungsten disulfide. And the lubricated parts usually have long service lives, together with high work efficiency.