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Preparation method of nitrogen-sulfur co-doped porous graphene by means of supramolecular template method

A technology of nitrogen-sulfur co-doping and porous graphene, applied in the direction of graphene, nano-carbon, etc., can solve the problems of large force of graphene sheets, loss of active sites, unfavorable electrolyte penetration, etc., and achieve easy scale The effect of synthesis, low cost, and simple operation process

Inactive Publication Date: 2020-02-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong force of the graphene sheets, the sheets are prone to aggregation, which is not conducive to the penetration of the electrolyte and causes the loss of active sites.

Method used

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  • Preparation method of nitrogen-sulfur co-doped porous graphene by means of supramolecular template method
  • Preparation method of nitrogen-sulfur co-doped porous graphene by means of supramolecular template method
  • Preparation method of nitrogen-sulfur co-doped porous graphene by means of supramolecular template method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Prepare 150 mL of graphene oxide aqueous solution with a concentration of 2 mg / mL, ultrasonically disperse for 30 min, and add 100 mL of nitrogen-nitrogen dimethylformamide.

[0026] Step 2: Add 420 mg of melamine and 570 mg of thiocyanuric acid to the graphene oxide dispersion liquid in sequence under stirring at 80° C., and react for 5 hours.

[0027] Step 3: hot filter the reaction product, wash it several times, and dry it in a constant temperature oven at 90° C. for 12 hours to obtain a composite of graphene oxide and melamine thiocyanate.

[0028] Step 4: Put the composite in a tube furnace, and heat it to 800° C. at a heating rate of 5° C. / min under an argon atmosphere, and continue heating for 2 hours to prepare nitrogen-sulfur co-doped porous graphene.

[0029] figure 1 It is the SEM figure of the nitrogen-sulfur co-doped porous graphene prepared by the present embodiment, figure 2 yes figure 1 The magnified view of , from which it can be seen that ...

Embodiment 2

[0033] Step 1: Prepare 150 mL of graphene oxide aqueous solution with a concentration of 2 mg / mL, ultrasonically disperse for 30 min, and add 100 mL of nitrogen-nitrogen dimethylformamide.

[0034] Step 2: Add 420 mg of melamine and 570 mg of thiocyanuric acid to the graphene oxide dispersion at 60°C while stirring, and react for 10 hours.

[0035] Step 3: hot filter the reaction product, wash it several times, and dry it in a constant temperature oven at 90° C. for 12 hours to obtain a composite of graphene oxide and melamine thiocyanate.

[0036] Step 4: Put the composite in a tube furnace, heat it to 900° C. at a heating rate of 5° C. / min under an argon atmosphere, and continue heating for 2 hours to prepare nitrogen-sulfur co-doped porous graphene.

Embodiment 3

[0038] Step 1: Prepare 100 mL of graphene oxide aqueous solution with a concentration of 2 mg / mL, ultrasonically disperse for 30 min, and add 100 mL of nitrogen-nitrogen dimethylformamide.

[0039] Step 2: Add 250 mg of melamine and 350 mg of thiocyanuric acid to the graphene oxide dispersion in sequence at 80° C. with stirring, and react for 2 hours.

[0040] Step 3: hot filter the reaction product, wash it several times, and dry it in a constant temperature oven at 90° C. for 12 hours to obtain a composite of graphene oxide and melamine thiocyanate.

[0041] Step 4: Put the compound in a tube furnace, heat it to 800° C. at a heating rate of 5° C. / min under an argon atmosphere, and continue heating for 1 hour to prepare nitrogen-sulfur co-doped porous graphene.

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Abstract

The invention relates to a preparation method of nitrogen-sulfur co-doped porous graphene by means of a supramolecular template method. According to the preparation method of the nitrogen-sulfur co-doped porous graphene by means of the supramolecular template method, graphene oxide is used as a raw material, a complex of the graphene oxide and melamine trimeric thiocyanate is obtained through supramolecular polymerization between the melamine and the trimeric thiocyanate, then the melamine trimeric thiocyanate is removed by calcination, and the nitrogen-sulfur co-doped porous graphene is prepared. According to the preparation method of the nitrogen-sulfur co-doped porous graphene by means of the supramolecular template method, compared with the prior art, a pore-forming agent or template agent is not needed to be introduced additionally, heteroatom precursors involved are all cheap industrial raw materials, so that the advantages of simple operation, low production cost and the like are achieved, the porous graphene is obtained, while nitrogen-sulfur co-doping is further achieved, and the obtained nitrogen-sulfur co-doped porous graphene has excellent electrochemical properties.

Description

technical field [0001] The invention belongs to the field of preparation of energy storage materials, and relates to a preparation method for preparing nitrogen-sulfur co-doped porous graphene by supramolecular template method. Background technique [0002] Graphene, as a two-dimensional carbon material, has excellent physical properties such as electrical conductivity and thermal conductivity. It has a series of in-depth researches in the fields of supercapacitors, lithium-ion batteries and other energy storage fields. Due to the strong force of the graphene sheets, the sheets are prone to aggregation, which is not conducive to the penetration of the electrolyte and causes the loss of active sites. In order to give full play to the advantages of graphene in the field of energy storage, the electrochemical performance of graphene can be improved by optimizing its pore structure and introducing heteroatom doping. At present, doped porous graphene is mainly prepared by introd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B32/184
Inventor 艾伟黄维孙晋蒙杜洪方
Owner NORTHWESTERN POLYTECHNICAL UNIV
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