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Research on application fields of molybdenum disulfide (MoS2)

MoS2 is a black solid powder with metallic luster, which is diamagnetic and semiconducting.Typical transition metal binary compounds. MoS2 has three crystal structures: 1T, 2H and 3R. Among them, only 2H type MoS2 has a layered structure similar to hexagonal hexagonal hexagonal structure. The interlayer is Mo-S-Mo, and the bonding force of sulfur atoms (van der Waals force) is weak and easy. Sliding, therefore having a lower coefficient of friction, is an extremely superior solid lubricant. The crystal structure and layered structure of MoS2 are shown in the figure.
1. Application of MoS2 in the field of lubrication
 MoS2 solid lubricating coatings have good adhesion performance, radiation resistance, good lubrication performance under special conditions such as ultra-high temperature and high vacuum. They have natural advantages in the field of lubricating coatings, and often A combination of graphite, 
cubic nitride  boron(BN) , etc. is used to achieve the best antifriction and antiwear effect.
Antifriction: The MoS2 particle size obtained by supersonic airflow is 325-2500 mesh, the microparticle hardness is 1-1.5, and the friction coefficient is 0.05-0.1, so it can be used in friction materials to reduce friction;
Increased friction: MoS2 is not conductive, and there are copolymers of molybdenum disulfide, molybdenum trisulfide and molybdenum trioxide. When the temperature of the friction material rises sharply due to friction, the molybdenum trioxide particles in the copolymer expand as the temperature rises, thereby enhancing the friction;
Anti-oxidation: MoS2 is obtained by a comprehensive chemical purification reaction, and its pH is 7-8, which is slightly alkaline. It covers the surface of the friction material, can protect other materials, prevent them from being oxidized, especially making other materials not easy to fall off, and the adhesion is enhanced;

Advantages and Disadvantages of MoS2
a. Completely eliminated the oil spill, clean and clean, greatly promoted civilized production.
b. Can save a lot of grease.
c. Improve the technical status of operation, extend the maintenance period, reduce the labor intensity of maintenance workers, and save labor.
d. Since the friction coefficient of MoS2 is low, the frictional resistance generated between the friction devices is small, which can save power consumption, and the electric power can be saved by 12% according to the measurement by the brother unit.
e. It can reduce mechanical wear, prolong the service life of friction equipment, reduce the loss of equipment parts, and improve the attendance rate of equipment.
f. Applying MoS2 lubrication can solve the technical key and improve work efficiency and work accuracy.
g. MoS2 has the function of filling and filling, which can restore the geometrical dimensions of some parts and prolong the service life.
h. MoS2 has the characteristics of moisture-proof, waterproof, alkali-proof and acid-proof.
i. A molded part that is smelted with plastic or powder of MoS2 can save a lot of non-ferrous metals.
j. Some equipments are lubricated with MoS2, which can eliminate the complicated oil supply system, greatly simplify the equipment structure, and relatively improve the utilization of the effective area. At the same time, it will also cause major reforms in equipment design.
k. MoS2 also has his shortcomings, such as poor thermal conductivity, low friction coefficient, and low penetration capacity (compared to thin oil). These shortcomings are the main obstacles to further expand the scope of use. Developed countries attach great importance to the research of solid lubricants. They have also held international lubrication conferences to exchange relevant information and explore new technology. Some industrialized countries in the United States, Japan and Western Europe have established friction, wear and tear in recent years. Lubricate the center.
In summary, the solid lubricating base of MoS2 is indeed a new type of lubricating material that conforms to “multiple, fast, good, and economical” and should be widely applied.

2 Application of MoS2 in photocatalysis
Photocatalytic reaction can effectively convert solar energy into chemical energy, which is to solve today's environmental pollution problems and energy
An effective way of source crisis. The synthesized MoS2 nano material has high specific surface area, high reaction activity, strong adsorption performance, good absorption of visible light and superior performance. It is an ideal environment-friendly photocatalytic material, which has extremely high research significance and broad field in this field. Application prospects.

3 Application of MoS2 in catalytic hydrogenation
 Catalytic hydrodesulfurization (HDS) is an important industry that has always been an energy purification and fuel efficiency improvement. The hydrogenation reaction can remove the sulfur-containing components in oil and gas to achieve the purpose of improving fuel burning rate and protecting the environment.

4 Application of MoS2 in the field of electrochemistry
 The nano-MoS2 thin layer has an energy band difference of about 1178 eV, which corresponds to the energy of light and has extensive research and development value in the field of photoelectrochemical materials. Due to the poor conductivity of MoS2, researchers in the field of electrochemistry often combine carbon materials such as graphite and graphene with WS2 and Mo S2 to obtain composites with large specific capacity, cycle stability and rate performance. Excellent and many other advantages.