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Method for preparing three-dimensional porous nitrogen-sulfur doped carbon nanosheet

A carbon nanosheet, three-dimensional porous technology, applied in nanocarbon, nanotechnology, nanotechnology and other directions, to achieve the effects of large-scale preparation, low cost, and easy experimental operation

Inactive Publication Date: 2018-12-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although two-dimensional doped graphene can significantly increase the specific capacity of the material as an electrode material, there is still a lot of room for improvement in terms of kinetics.

Method used

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  • Method for preparing three-dimensional porous nitrogen-sulfur doped carbon nanosheet

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Experimental program
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Effect test

Embodiment 1

[0016] (1) Dissolve 30mg of graphene oxide in 30ml of deionized water, ultrasonically disperse, then add 0.063g of melamine, stir evenly, and record it as liquid A.

[0017] (2) Dissolve 0.177g of thiocyanuric acid in 30ml of ethanol, stir evenly, and record it as solution B.

[0018] (3) Under the condition of magnetic stirring, slowly drop liquid B into liquid A, and then heat the obtained solution in a water bath at 80°C for 10 h with continuous stirring.

[0019] (4) Freeze-dry the sample, then raise the temperature to 350°C at a heating rate of 10°C / min in a vacuum environment and keep it warm for 2 hours, then raise the temperature to 700°C at the same heating rate and keep it warm for 2 hours. Perform cooling process.

[0020] Refer to attached figure 1 , figure 1 SEM photographs of samples prepared for this example. The S-4800 scanning electron microscope (SEM) of Japan Electronics Co., Ltd. was used to observe the morphology, and the porous three-dimensional nanos...

Embodiment 2

[0022] (1) Dissolve 60mg of graphene oxide in 30ml of deionized water, ultrasonically disperse, then add 0.063g of melamine, stir evenly, and record it as liquid A.

[0023] (2) Dissolve 0.354g of thiocyanuric acid in 15ml of nitrogen-methylpyrrolidone, stir evenly, and record it as liquid B.

[0024] (3) Under the condition of magnetic stirring, slowly drop liquid B into liquid A, and then heat the obtained solution in a water bath at 100°C for 2 hours with continuous stirring.

[0025] (4) Freeze-dry the sample, then raise the temperature to 500°C at a heating rate of 20°C / min in a vacuum environment and keep it warm for 2 hours, then raise the temperature to 800°C at the same heating rate and keep it warm for 1 hour. Perform cooling process.

Embodiment 3

[0027] (1) Dissolve 100mg of graphene oxide in 25ml of deionized water, ultrasonically disperse, then add 0.126g of melamine, stir well, and record it as liquid A.

[0028] (2) Dissolve 0.177g of thiocyanuric acid in 20ml of nitrogen-methylpyrrolidone, stir evenly, and record it as liquid B.

[0029] (3) Under the condition of magnetic stirring, slowly drop liquid B into liquid A, and then heat the obtained solution in a water bath at 120°C for 1 hour with continuous stirring.

[0030] (4) Freeze-dry the sample, then raise the temperature to 400°C at a heating rate of 20°C / min in a vacuum environment and keep it warm for 3 hours, then raise the temperature to 900°C at the same heating rate and keep it warm for 0.5h. Protect the cooling process.

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Abstract

The invention relates to a three-dimensional porous nitrogen-sulfur doped carbon nanosheet. A method for preparing the three-dimensional porous nitrogen-sulfur doped carbon nanosheet comprises the following steps: an uniform solution containing thiocyanuric acid is slowly added to an aqueous solution of graphene oxide in which melamine is dissolved, and the materials are fully stirred at 50 to 120DEG C; a product is subjected to two-stage heat treatment at 300-500 DEG C and 700-900 DEG C under vacuum environment, inert atmosphere is introduced until the temperature is lowered, and the three-dimensional porous nitrogen-sulfur doped carbon nanosheet is obtained. The method adopts melamine and trithiocyanuric acid to form a carbon skeleton by molecular polymerization, and a three-dimensionalcarbon material is constructed into with the participation of graphene; at the same time, melamine and trithiocyanuric acid are used as nitrogen and sulfur-doped nitrogen sources and sulfur sources,and the graphene carbon material is subjected to nitrogen and sulfur doping. The carbon material has good rate performance as a lithium and sodium battery anode, and a large specific surface area anda multi-stage pore structure are easy to realize sulfur loading. The preparation method has the advantages of simple operation and low cost, and can realize large scale preparation.

Description

technical field [0001] The invention belongs to the technical field of nano-carbon materials, and in particular relates to a preparation method of a three-dimensional porous nitrogen-sulfur-doped carbon nanosheet. Background technique [0002] Carbon materials have been widely studied in the field of lithium-ion and sodium-battery anodes due to their high conductivity, abundant sources, low cost, and stable electrochemical performance. Graphene, as a two-dimensional crystal with a single carbon atomic layer thickness, has been favored by researchers since its discovery, because both theoretical and experimental results show that graphene has the highest electron mobility, thermal conductivity and mechanical strength. Physical and chemical properties. However, graphene's lack of inherent band gap and its easy restacking in experiments limit its practical application in various fields. Studies have shown that heteroatom doping can effectively open the band gap of graphene, r...

Claims

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Application Information

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IPC IPC(8): C01B32/184H01M4/583B82Y30/00
CPCH01M4/583B82Y30/00C01B32/184C01B2204/22Y02E60/10
Inventor 黄剑锋席乔李嘉胤曹丽云王彩薇李倩颖王天罗晓敏
Owner SHAANXI UNIV OF SCI & TECH
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