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Preparation method of porous graphene

A porous graphene and graphene technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of small pore size range of porous graphene

Active Publication Date: 2013-01-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The current method for preparing porous graphene is to use potassium hydroxide to chemically activate graphene at high temperature and inert atmosphere to obtain porous graphene. Although the preparation of porous graphene by the above method improves the specific surface area of ​​graphene, the porous graphene The pore size range is relatively small, only 0.5~5nm

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[0020] The embodiment of the present invention discloses a preparation method of porous graphene, comprising:

[0021] The carbon material is heated with an activator to react to obtain porous graphene, the carbon material is graphene or modified graphene, and the activator is a transition metal or a transition metal compound.

[0022] In the process of preparing porous graphene, the present invention fully contacts the carbon material with a transition metal or transition metal compound activator, and reacts the carbon material with the transition metal or transition metal compound under heating conditions to obtain a transition metal carbide, The transition metal obtained from the decomposition of the transition metal carbide is reacted with the carbon material again, and the reaction is repeated, and finally porous graphene is obtained.

[0023] According to the present invention, the carbon material and the activator are heated to make the activator react with the carbon m...

Embodiment 1

[0035] (1) Stir 100mg graphene oxide, 100mg nickel powder and 400mL water evenly to make a slurry;

[0036] (2) Dry the above slurry in a vacuum oven at 60°C, and anneal at 600°C for 1 hour under the protection of an inert atmosphere in a tube furnace;

[0037] (3) After the reaction, the product was treated in dilute hydrochloric acid, washed and dried to obtain porous graphene. figure 1 The scanning electron micrograph of the porous graphene prepared for the present embodiment, figure 2 Transmission electron micrograph of porous graphene, by figure 1 and figure 2 It can be seen that there are uniform pores distributed on the surface of the graphene, and the diameter of the porous graphene is about 20 nm.

Embodiment 2

[0039] (1) Stir 100mg graphene oxide, 200mg iron oxide and 300mL water evenly to make a slurry;

[0040] (2) Dry the above slurry in a vacuum oven at 60°C, and anneal at 700°C for 2 hours under the protection of an inert atmosphere in a tube furnace;

[0041] (3) After the reaction, the product was treated in dilute hydrochloric acid, washed and dried to obtain porous graphene.

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Abstract

The invention provides a preparation method of porous graphene. The method comprises the steps of: heating a carbon material and an activator; obtaining the porous graphene after reaction, wherein the carbon material is modified graphene or graphene, and the activator is a transitional metal or a transitional metal compound; in the process of preparing the porous graphene, heating the graphene or the modified graphene and the activator: the transitional metal or the transitional metal compound to form a transitional metal carbide; further decomposing the transitional metal carbide into carbon and transitional metal to obtain the transitional metal for continuously reacting with the graphene; and circulating in this way to finally obtain the porous graphene. Compared with the prior art, as the transitional metal and the carbon material are reacted circularly, the porous graphene with larger aperture range can be obtained. Experimental result shows that the diameter of the porous graphene prepared by the invention is 1-100nm.

Description

technical field [0001] The invention relates to the technical field of carbon materials, in particular to a method for preparing porous graphene. Background technique [0002] As a two-dimensional carbon material, graphene material is composed of single-layer graphite, which is the basic structural unit of fullerene, carbon nanotube and graphite. Graphene is the thinnest and strongest material known so far. It has excellent electrical conductivity, extremely excellent thermal conductivity, high hardness and good ductility. Due to the above-mentioned series of excellent properties, graphene material has great potential application value in the fields of nano-devices, heat conduction, electric conduction and energy storage, and has become a recent research hotspot. [0003] In order to expand the application range of graphene, researchers began to study the chemical modification and activation of graphene. For example, nitrogen doping is used to improve the conductivity and ...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/194
Inventor 周旭峰曹海亮刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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