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Nitrogen-doped graphene and preparation method thereof

A nitrogen-doped graphene and mixture technology, applied in the field of carbon materials, can solve the problems of multiple preparation procedures, low nitrogen doping amount, harsh reaction conditions, etc., and achieve a simple process, short production cycle, and easy large-scale production. Effect

Inactive Publication Date: 2014-10-22
SHENZHEN CAPCHEM TECH CO LTD
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  • Abstract
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Problems solved by technology

These methods have the following disadvantages at present: chemical vapor deposition method, ammonia source pyrolysis method, nitrogen plasma discharge method, arc discharge method, etc. have low nitrogen doping amount and many preparation procedures; liquid phase nitrogen doping method although nitrogen doping amount can be up to 16.4%, but involves the dangerous raw material Li 3 N, the reaction conditions are relatively harsh

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  • Nitrogen-doped graphene and preparation method thereof

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preparation example Construction

[0014] The nitrogen-doped graphene preparation method provided by the present invention comprises:

[0015] heating the mixture of the imidazole derivative and the inorganic base to 400-800° C. in a non-oxidizing atmosphere to obtain a mixture of nitrogen-doped graphene and metal oxide;

[0016] removing metal oxides in the mixture to obtain nitrogen-doped graphene;

[0017] Wherein, the nitrogen source is selected from benzimidazole, methylmercaptobenzimidazole, mercaptobenzimidazole, 2-methylimidazole, 2-ethylimidazole, 2-butylimidazole, 2-undecylimidazole, 2- -one or more of heptadecyl imidazole and 1-benzyl-2-methyl imidazole;

[0018] Wherein, the inorganic base is selected from one or more of hydroxides of lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium or barium.

[0019] The mechanism that the present invention prepares nitrogen-doped graphene is as follows:

[0020] In a mixed system containing imidazole derivatives and inorganic bases, ...

Embodiment 1

[0029] Example 1. Weigh 0.7 g of benzimidazole and 1.5 g of lithium hydroxide respectively, mix them evenly in a mortar, put them into a magnetic boat, and heat them to 600° C. in a tube furnace in a nitrogen atmosphere for 2 After the furnace temperature was lowered to room temperature, nitrogen-doped graphene and calcium oxide composite were obtained, washed with 10 ml of 37% concentrated hydrochloric acid at room temperature for 4 hours, and suction-filtered to dryness to obtain nitrogen-doped graphene. By elemental analysis, the nitrogen content of the nitrogen-doped graphene is 14%.

Embodiment 2

[0030] Example 2. Weigh 0.5 g of benzimidazole and 1.5 g of strontium hydroxide respectively, mix them in a mortar, put them into a magnetic boat, and heat them to 800° C. in a tube furnace in an argon atmosphere. After 2 hours, the furnace temperature was lowered to room temperature to obtain a nitrogen-doped graphene and calcium oxide composite, washed with 10 ml of 37% concentrated hydrochloric acid at room temperature for 4 hours, and suction filtered to dryness to obtain nitrogen-doped graphite ene. Through elemental analysis, the nitrogen content of the nitrogen-doped graphene is 10.3%.

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Abstract

The invention relates to a nitrogen-doped graphene and a preparation method thereof. The preparation method comprises the following steps: heating a mixture of imidazole derivatives and inorganic base to 400-800 DEG C under a non-oxidizing atmosphere so as to obtain a nitrogen-doped graphene and metal oxide mixture; removing the metal oxide in the mixture to obtain the nitrogen-doped graphene. The nitrogen-doped graphene can be prepared by heating the mixture of imidazole derivatives and inorganic base under non-oxidizing atmosphere through utilizing conception that imidazole derivatives are pyrolyzed to generate activated carbon and nitrogen atoms and carry out base catalysis on accelerate the growth in two-dimension direction. The method has the characteristics of being simple in technology, short in production period, easy for mass production, free from dangerous and toxic raw materials, and capable of doping nitrogen in situ, and according to the selected different nitrogen sources, the prepared nitrogen-doped graphene has the characteristic of being adjustable in nitrogen content, the content of doped nitrogen can be up to 14% generally, and the nitrogen-doped graphene can be applied in the fields of lithium ion batteries, super capacitors, electric catalysis and the like.

Description

technical field [0001] The invention relates to the technical field of carbon materials, in particular to a nitrogen-doped graphene and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional honeycomb lattice material formed by planar single-layer carbon atoms tightly bound together. Since Geim's group first prepared single-layer graphene in 2004, graphene has attracted widespread attention for its unique structure and excellent physical properties. However, the electrical conductivity of graphene cannot be fully controlled like conventional semiconductors due to its lack of energy band gap, and the smooth and inert surface of graphene is not conducive to the composite with other materials, which hinders the application of graphene. Nitrogen doping in graphene can open the energy band gap and adjust the conductivity type, change the electronic structure of graphene, and increase the free carrier density of graphene, thereby improving the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 马建民毛玉华
Owner SHENZHEN CAPCHEM TECH CO LTD
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