Porous graphene with stratified columnar support structure and its preparation method

Abstract

The invention provides porous graphene with a stratified columnar support structure and its preparation method. The method comprises: (1) adding a porous metal oxide inorganic template with a lamellar structure and a precursor of carbon into an organic solvent able to dissolve the carbon precursor; (2) heating and vacuum pumping the product of step (1) so as to remove the solvent; (3) subjecting the product of step (2) to heat treatment in an inert atmosphere for 30-400min at a temperature of 500-1000DEG C; then collecting the solid product after cooling; (4) treating the solid product with a dilute acid for removing the metal oxide template, thus obtaining a porous graphene material. The porous graphene material with a stratified columnar support structure prepared by the preparation method of the invention not only has holes with a diameter larger than 2nm distributed in the graphene lamellar layer, but also has columnar supports between graphene lamellas. Able to reduce the mass transfer resistance between graphene lamellas, the porous graphene in the invention boasts wide application prospects in the fields of energy storage, hydrogen storage, catalysis, and environmental protection, etc.

Description

technical field [0001] The invention relates to nanometer materials, and the invention also relates to a preparation method of nanometer materials, belonging to the field of material science. In particular, it relates to a porous graphene with a layered columnar support structure and a preparation method thereof. Background technique [0002] Graphene material is a nano-scale graphite material composed of single-layer graphite. Due to its excellent electrical conductivity, thermal conductivity and mechanical properties, it has great potential application value in the fields of nano-devices, heat conduction, electrical conduction and energy storage. The theoretical specific surface area is as high as 2600m 2 / g, with outstanding thermal conductivity (3000W / (m K)) and mechanical properties (1060GPa), as well as high-speed electron mobility at room temperature [15000cm 2 / (V·s)]. However, due to the high van der Waals force between graphene sheets, it is easy to agglomerate ...

AI Technical Summary

Problems solved by technology

However, due to the high van der Waals force between graphene sheets, it is easy to agglomerate during the preparation process, resulting in the inability to fully utilize the specific surface area.

Porous graphene is to manufacture some nanometer-sized holes in the graphene sheet by physical or chemical methods. This structure makes graphene not only have a high specific surface area when used as an energy source, catalyst or adsorption material, but also There is also a good mass transfer effect, giving full play to the advantages of this two-dimensional nanosheet material. At present, there are few reports on the preparation of porous graphene.

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