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A kind of preparation method of high nitrogen doped graphene

A graphene and high-nitrogen technology, applied in graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of high cost, complicated method, low nitrogen content of nitrogen-doped graphene, etc., and achieve low price and high preparation process Simple, readily available ingredients

Active Publication Date: 2019-08-16
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the technical problems of complex methods, high cost, and low nitrogen content in the obtained nitrogen-doped graphene in the existing methods, and provides a simple method, low cost, and high nitrogen content in the product. Preparation method of high nitrogen doped graphene

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  • A kind of preparation method of high nitrogen doped graphene
  • A kind of preparation method of high nitrogen doped graphene
  • A kind of preparation method of high nitrogen doped graphene

Examples

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Embodiment 1

[0021] 1) 1.00g hexamethylenetetramine, 4.24g zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O) Dissolve in 50ml of absolute ethanol respectively, dissolve completely at a stirring rate of 400r / min and then mix together. After reacting for 1 hour, centrifuge the obtained coordination polymer precipitate, and wash several times with absolute ethanol. The obtained mixture is heated and dried in a blast oven, and ground into powder to obtain a hexamethylenetetramine / zinc coordination polymer precursor.

[0022] 2) Take the precursor in step 1 and place it in a carbonization furnace, and raise the temperature to 800° C. at a heating rate of 10° C. / min under the protection of nitrogen for 2 hours to obtain high-nitrogen-doped graphene.

[0023] as attached figure 1 As shown by scanning electron microscopy (SEM), the obtained coordination polymer precursor is assembled from nanosheets. as attached figure 2 As shown, the high nitrogen-doped graphene obtained by 800 °C treatment re...

Embodiment 2

[0025] The operation method is the same as that of Example 1, except that the temperature in the carbonization process is 600° C., and the temperature is kept for 2 hours to obtain high-nitrogen-doped graphene.

[0026] as attached Figure 4 As shown, the nitrogen content of the high nitrogen-doped carbon material obtained at 600°C is 25.24at%.

Embodiment 3

[0028] The operation method is the same as that of Example 1, except that the temperature in the carbonization process is 700° C., and the temperature is kept for 2 hours to obtain high-nitrogen-doped graphene.

[0029] as attached Figure 4 As shown, the nitrogen content of high nitrogen-doped graphene obtained by 700 ° C treatment is 19.78 at%.

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Abstract

The invention relates to a preparation method of high-nitrogen doped graphene and solves the technical problems that existing method is complicated and has relatively high cost and the obtained nitrogen doped graphene often has relatively low nitrogen content. The preparation method comprises the following steps: making hexamethylenetetramine react with zinc salt in a solvent; performing suction filtration or centrifugation; washing off the unreacted raw materials by use of a solvent; drying to obtain a hexamethylenetetramine / zinc coordination polymer precursor; taking the coordination polymerprecursor obtained by the step I, and gradually heating in an inert atmosphere to obtain the high-nitrogen doped graphene. The preparation method provided by the invention can be widely applied to the field of preparation of high-nitrogen doped graphene.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a method for preparing high-nitrogen-doped graphene. Background technique [0002] Graphene is made of sp 2 A two-dimensional honeycomb planar structure composed of hybridized carbon atoms. Due to its unique physical and chemical properties, such as high specific surface area, high elastic modulus, good electrical conductivity, and high thermal conductivity, it has broad application prospects in energy storage, adsorption, sensing, and catalysis. [0003] Studies in recent years have shown that by doping and modifying graphene, its electronic structure and surface properties can be effectively adjusted, thereby greatly improving its performance in all aspects. Among the many modification methods, nitrogen doping has been extensively studied as a very effective method. By introducing electron-rich N atoms into the carbon skeleton, the energy band structure of the material can...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184H01M4/62H01M4/36
CPCC01B2204/22C01P2002/01C01P2002/80C01P2004/03H01M4/364H01M4/625Y02E60/10
Inventor 周继升刘斯通宋怀河
Owner BEIJING UNIV OF CHEM TECH