Method for preparing graphene

A graphene and natural flake graphite technology, applied in the field of materials, can solve the problems of high manufacturing cost of graphene, low product quality, low productivity, etc., and achieve the effects of low production cost, low raw material cost, and simple operation.

Inactive Publication Date: 2012-10-17
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a graphene preparation method to solve the problems of high manufacturing cost, complicated operation, low product quality or low productivity of graphene which limit its commercial application

Method used

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  • Method for preparing graphene

Examples

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Embodiment 1

[0042] A method for preparing graphene, see the schematic diagram of the technical scheme figure 1 , Use natural flake graphite powder and N-octylpyridine hexafluorophosphate (OPFP) ionic liquid to mix, manually grind under anaerobic conditions, then disperse the resulting mixture in water, centrifuge to remove by-products, and volatilize the solvent (water), The graphene in the ionic liquid state is obtained. Specific steps are as follows:

[0043] Step 1: Mix natural flake graphite powder with a mass ratio of 1:0.6 and OPFP at room temperature.

[0044] Step 2: Put the mixture in an agate mortar and manually grind for 2 hours under nitrogen protection.

[0045] Step 3. The ionic liquid combined with graphene with a small amount of impurities after the grinding mixture can be directly used to prepare or modify electrochemical working electrodes, or it can be further processed to obtain high-purity OPFP combined with graphene—that is, 1g of the mixture is transferred into 0.5L of wa...

Embodiment 2

[0050] A method for preparing graphene, see the schematic diagram of the technical scheme figure 1 , Using natural flake graphite powder and N-hexylpyridine tetrafluoroborate ([Bpy]BF 4 ) Mix the ionic liquid, mechanically grind under anaerobic conditions, then disperse the resulting mixture in water, centrifuge to remove the by-products, and volatilize the solvent (water) to obtain graphene in the ionic liquid state. Specific steps are as follows:

[0051] Step 1: Combine natural flake graphite powder with a mass ratio of 1:2 and [Bpy]BF 4 Mix at room temperature.

[0052] Step 2: Put the mixture in a stainless steel tank, and under the protection of nitrogen, the stirrer drives a stainless steel ball with a diameter of 3 cm to stir and grind for 5 hours.

[0053] Step 3. The mixture after grinding is a small amount of impurity ionic liquid combined with graphene can be directly used to prepare or modify the electrochemical working electrode, or it can be further processed to obtain...

Embodiment 3

[0058] Using N-octylpyridine nitrate instead of N-octylpyridine hexafluorophosphate in Example 1, the other steps are the same as those in Example 1, and high-quality graphene can be prepared in the same way.

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Abstract

The invention relates to a method for preparing graphene, belonging to the technical field of materials. The method comprises the steps of: mixing natural flake graphite powder and ionic liquid; carrying out mechanical grinding under the anaerobic condition; then dispersing the obtained mixture in water; carrying out centrifugation to remove by-product; and volatilizing solvent (water) to obtain the graphene which is in an ionic liquid binding state. The method is low in raw material cost, simple in operation, high in efficiency, energy-saving and environment-friendly; and the graphene which is in the ionic liquid binding state and is prepared by the invention has the layer numbers within the range of 1-10, and does not contain oxidation group, so that excellent electric conduction and electrochemical catalytic activity are maintained, and the graphene is especially suitable for preparing a high-performance electrode.

Description

Technical field: [0001] The present invention relates to the technical field of materials, in particular to a method for preparing graphene, in particular to a method for preparing ionic liquid combined with graphene. Background technique: [0002] When the number of graphite layers is less than 10 layers, they are collectively called graphene materials, which exhibit different structures and properties than ordinary three-dimensional graphite: the theoretical specific surface area is as high as 2600m 2 / g; has outstanding thermal conductivity (3000W / (m·K)) and mechanical properties (1060 GPa); high-speed electron mobility at room temperature (1 5000cm 2 / (V·s)). Due to a series of specific properties such as perfect quantum tunneling effect, half-integer quantum Hall effect, conductivity that never disappears, graphene materials are used in composite materials, nanodevices, electronic components, hydrogen storage materials, and sensor preparation. The field has been extensively ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/19
Inventor 张旭志曲克明赵俊陈聚法马绍赛
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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