Introduction of a small layer graphene powder

Product description

The small layer of graphene inherits the original crystal structure and characteristics of natural flake graphite; it has excellent electrical, thermal and mechanical properties with a large shape ratio (diameter/thickness ratio). It has excellent electrical conductivity, lubrication, corrosion resistance and high temperature resistance. The graphene has a specific surface area of 400 to 700 m 2 /g and a thickness of 0.55 to 3.74 nm. Graphene has a high specific surface. It is easy to uniformly compound with other materials such as polymer materials and form a good composite interface. The company's small layer graphene products have formed large-scale industrial production capacity.

Main application areas:

As a very good base material for the preparation of industrial-scale functional composites, a small amount of graphene will play an important role in the new round of industrial revolution. Inorganic nanoparticle attached graphite flakes not only effectively prevent these sheets from being repeatedly stacked during chemical reduction, but also promote the formation of a new class of materials with graphene as a carrier. Graphene inorganic nanocomposites show excellent performance. These excellent properties can be widely used in the fields of emission displays, sensors, supercapacitors, batteries, catalysis, etc., which can significantly improve the performance of nanomaterials, enabling the most promising application materials in nanotechnology to be widely industrialized.

The small layer of graphene has great value in the energy field and is of great application value in hydrogen storage, natural gas storage, supercapacitor and lithium battery applications. Single-layer/small-layer graphene with little defects is the most widely used commercial lithium-ion battery anode material; and the defect-rich layered graphene is the main electrode material of the current supercapacitor. In supercapacitor applications, the large specific surface area of the small layer of graphene is beneficial to the high dispersion of the nanoparticles, and the excellent conductivity facilitates the transfer of electrons from the nanoparticles to the graphene-based body during the electrochemical process, which can effectively suppress the super The phenomenon of passive film formed by agglomeration occurs during the electrochemical cycle of the capacitor, and the cycle performance of the electrode material is improved. Replacing conventional graphite materials with graphene in a lithium-ion battery will greatly increase the lithium storage capacity of the negative electrode, thereby increasing the energy density of the lithium ion battery; in addition, when graphene is used as a negative electrode material for lithium ion batteries, lithium ions are in the graphene material. The diffusion path in the middle is relatively short, and the conductivity is high, which can greatly improve the rate performance. In the aspect of hydrogen storage, when some atoms (such as transition metals and alkali metals) are adsorbed on the surface of a small layer of graphene, adsorption is performed. The charge transfer between the atomization and the substrate changes the local charge density, which greatly increases the adsorption capacity of graphene for hydrogen.

Graphene-based composites: Graphene-based polymer composites are an important direction for graphene to practical applications. Since graphene has excellent performance and low cost, and functionalized graphene can be processed by conventional methods such as solution processing, it is very suitable for developing high-performance polymer composite materials. The conductive percolation threshold of conductive plastic prepared from graphene microchips is much lower than that of ordinary conductive fillers, which overcomes the shortage of ordinary graphite fillers and has wide application in plastic conductive, antistatic materials andspecial absorbing materials. A significant advantage of graphene in improving the mechanical properties of polymer composites over other inorganic nanofillers is that even very low levels can significantly improve the mechanical properties of nanocomposites.

Thermal conductive adhesive, thermal conductive polymer composite material, thermal interface material and heat dissipating material: the small layer of graphene nanosheet itself has a very high thermal conductivity and can be used as an additive for composite materials to greatly improve the thermal conductivity of the matrix material in thermal function. The material aspect is of great value.

Excellent catalytic material and catalytic carrier material. A small layer of graphene can be used as an ideal catalyst carrier, and a metal/graphene system will provide a new model catalytic research system for surface catalysis research. A small number of graphenes can also form controlled chemical defects by surface functionalization, such as surface hydroxyl groups, carbonyl groups, epoxy groups, etc. These chemical defects can serve as a nucleation center for metal growth, and achieve the purpose of controlling metal growth. For example, carbon holes and oxygen-containing functional groups on the surface of graphene can disperse and stabilize sub-nanometer Pt clusters, so that graphene-supported Pt catalysts exhibit superior catalytic performance over carbon black-supported Pt catalysts in methanol oxidation and other reactions. . Graphene-supported catalytic systems will exhibit many special catalytic activities due to their excellent electrical conductivity, thermal conductivity and structural stability, as well as the electronic modification of graphene to supported metal catalysts. Graphene will have important applications in heterogeneous catalysis. The use of functionalized graphene as a catalyst may achieve a metal-free catalytic process, which provides an effective way to solve the problem of reducing and replacing precious metal catalysts in heterogeneous catalysis. In addition, graphene-loaded heterogeneous catalyst systems also exhibit some unique properties.

High-temperature lubricating materials: Graphene nanosheets have the characteristics of corrosion resistance and high temperature resistance, and the super-lubricity of friction between the layers of graphene sheets is almost zero, and the root cause is mainly the characteristics of the surface of the layer of graphene. The arrangement of the atoms and the surface atoms of the graphene are arranged like a raised hexagonal empty eggshell. When the surface slides in a specific direction, the protrusions are staggered from each other, so that the surface has almost no friction. It can be used as a high temperature lubricating material as lubricating oil additive.

In addition, graphene nanosheets have broad application prospects in the fields of defense industry,special industry, automobile industry, communication industry and energy industry in the fields of electromagnetic shielding materials, advanced conductive inks and high-strength engineering plastics.

Main data:

Carbon content: >97%

Ash: ≤0.1

Moisture: ≤1.0%

Thickness: 0.55~3.74nm

Diameter: 0.5-3μm

Number of layers: 1-10 layers

Specific surface area: 350-600m2/g

The page contains the contents of the machine translation.

The page contains the contents of the machine translation.