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Recently, under the support of the Beijing Municipal Science and Technology Commission, Professor Zhang Qiang and Professor Wei Fei of the Department of Chemical Engineering of Tsinghua University have succeeded in preparing a pillared graphene with self-dispersed and non-stacking characteristics. The related results were published in the international authoritative academic journal Natural - Newsletter.
Graphene is a two-dimensional sheet-like nano-carbon material with excellent mechanical, thermal, electrical, optical properties, and a wide range of applications. However, the strong interaction between graphene leads to its easy stacking, which reduces the specific surface area of ​​the material and limits the efficient use of its interface. At present, the method for preventing the stacking of graphene is to introduce a metal oxide, a conductive polymer, a carbon black, a carbon nanotube, and the like between layers of the graphene. This method has the problems of changing the graphene bulk properties and the interface complexity.
The research group obtained graphene with a protruding structure by modulating the topological structure of graphene by catalytic vapor phase growth. The intrinsically self-dispersing, non-stacking new graphene has a specific surface area of ​​up to 1628 m2g-1, a large number of mesopores with a pore size of 2-7 nm, a pore volume of up to 2.0 cm3 g-1, and a conductivity of up to 438 S. Cm-1, at the same time, it is easier to build a highly efficient conductive network and unimpeded ion channels, and its energy storage performance is significantly improved. When the pillared graphene is used as a positive electrode of a lithium-sulfur battery, the energy density and power density of the material of the pillared graphene are significantly better than those of a cathode material used for a commercial lithium ion battery, and have potential applications in electric vehicles, personal electronic products, and large-scale energy storage. prospect.
Rotary Evaporator is an indispensable instrument for the process of evaporation, concentration, crystallization, drying, separation and solvent recovery in the scientific research and production process of the pharmaceutical, chemical and biological products industry.
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