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Nitrogen-doped graphene carbon composite material and preparation method thereof

A nitrogen-doped graphene and composite material technology, applied in the field of material science, can solve the problems of low yield of freeze-drying technology, unsuitable for industrial production, reduced electrical properties, etc., and achieves a simple and easy preparation process, less agglomeration, and dispersibility. good effect

Active Publication Date: 2015-03-25
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene-based materials, especially nitrogen-doped graphene, are easy to agglomerate between sheets, resulting in a decrease in electrical properties. Therefore, nitrogen-doped graphene with a large specific surface area is generally prepared by freeze-drying. Drying technology has low output and high energy consumption, so it is not suitable for industrial production

Method used

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  • Nitrogen-doped graphene carbon composite material and preparation method thereof
  • Nitrogen-doped graphene carbon composite material and preparation method thereof
  • Nitrogen-doped graphene carbon composite material and preparation method thereof

Examples

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Embodiment 1

[0032] Example 1 1g of glucose was added to 1000ml of graphene oxide aqueous solution (concentration of 0.2 mg mL -1 ), stirring for 30 minutes, rotating speed 100-300 rev / min. Then 1 ml of aqueous ammonia solution (25-28%) was added and stirring was continued for 2 hours at 95°C. Then add 20mg of CTAB, filter and wash after stirring for ten minutes. Drying under vacuum at 60°C for 12 hours yielded a graphene oxide / glucose mixture. Take 100 mg of graphene oxide / glucose mixture and sonicate it for 30 minutes with a power of 100 W, disperse it in 100 ml of water, add 0.1 ml of pyrrole, stir for 30 minutes, add 0.1 ml of concentrated hydrochloric acid solution, and sonicate for 5 minutes, then add 5 ml of over An aqueous solution of ammonium sulfate (1 mmol) was reacted at 0°C for 2 hours. The product is then filtered, washed and freeze-dried. The product is ammoniated at 700°C for 30 minutes under an atmosphere of argon gas, and the heating rate is 30°C / min. looks like f...

Embodiment 2

[0033] Example 2 25g of glucose was added to 1000ml of graphene oxide aqueous solution (concentration is 5 mg mL -1 ), stirring for 30 minutes, rotating speed 100-300 rev / min. Then 25 ml of aqueous ammonia solution (25-28%) was added and stirring was continued for 2 hours at 95°C. Then add 500mg of CTAB, filter and wash after stirring for ten minutes. Drying under vacuum at 60°C for 12 hours yielded a graphene oxide / glucose mixture. Take 100 mg of graphene oxide / glucose mixture and sonicate it for 30 minutes with a power of 100 W, disperse it in 100 ml of water, add 0.1 ml of pyrrole, stir for 30 minutes, add 0.1 ml of concentrated hydrochloric acid solution, and sonicate for 5 minutes, then add 5 ml of over An aqueous solution of ammonium sulfate (1 mmol) was reacted at 0°C for 2 hours. The product is then filtered, washed and freeze-dried. The product is ammoniated at 750°C for 30 minutes under an atmosphere of argon gas, and the heating rate is 30°C / min. looks like ...

Embodiment 3

[0034] Example 3 10g of glucose was added to 1000ml of graphene oxide aqueous solution (concentration was 2 mg mL -1 ), stirring for 30 minutes, rotating speed 100-300 rev / min. Then 10 ml of ammonia solution (25-28%) was added and stirring was continued for 2 hours at 95°C. Then add 200 mg of CTAB, filter and wash after stirring for ten minutes. Drying under vacuum at 60°C for 12 hours yielded a graphene oxide / glucose mixture. Take 100 mg of graphene oxide / glucose mixture and sonicate it for 30 minutes with a power of 100 W, disperse it in 100 ml of water, add 0.1 ml of pyrrole, stir for 30 minutes, add 0.1 ml of concentrated hydrochloric acid solution, and sonicate for 5 minutes, then add 5 ml of over An aqueous solution of ammonium sulfate (1 mmol) was reacted at 0°C for 2 hours. The product is then filtered, washed and freeze-dried. The product is ammoniated at 750°C for 30 minutes under an atmosphere of argon gas, and the heating rate is 30°C / min. looks like image...

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Abstract

The invention discloses a nitrogen-doped graphene carbon composite material and a preparation method thereof. The composite material comprises nitrogen-doped graphene and a nitrogen-doped carbon material covering the periphery of the nitrogen-doped graphene. The preparation method comprises the following steps: dissolving carbohydrate into graphene oxide dispersion liquid to ensure that carbohydrate uniformly covers the graphene oxide to form a graphene oxide / carbohydrate complex; coating the surface of the graphene oxide / carbohydrate complex by a polymer to form a graphene oxide / carbohydrate / polymer complex; nitriding the graphene oxide / carbohydrate / polymer complex in a high-temperature environment at the temperature of more than 700 DEG C to form the nitrogen-doped graphene carbon composite material. The composite material is high in specific surface area, less in aggregates, high in dispersibility and high in conductivity; the preparation is simple and feasible in process, low in energy consumption, high in yield and suitable for scale industrial production; moreover, freeze drying operation is eliminated.

Description

technical field [0001] The invention relates to a conductive carbon material, in particular to a nitrogen-doped graphene carbon composite material, which belongs to the field of material science. Background technique [0002] Due to its unique two-dimensional monolayer structure and excellent physical properties (high theoretical specific surface area, high electrical conductivity, high mechanical properties, etc.), graphene has broad application prospects in lithium-ion batteries and supercapacitor electrode materials. In order to obtain graphene-based materials with better electrical properties, the industry has studied a variety of solutions. For example, one of the methods is to prepare graphene composite materials by physical mixing to improve their electrical properties, while the other is more The feasible way is the chemical modification method, such as introducing other elements into the graphene material by doping, especially the N element to improve its electrical...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583
CPCH01M4/362H01M4/48H01M4/587H01M4/602H01M10/0525Y02E60/10
Inventor 张跃钢邱勇才侯远李桂珠刘美男周莉莎李宛飞
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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