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Honeycomb porous graphene and preparation method thereof

A porous graphene and honeycomb technology, applied in the field of honeycomb porous graphene and its preparation, can solve the problems of porous structure distribution control, poor distribution uniformity, easy agglomeration of graphene, etc., achieve less heteroatom defects, prevent agglomeration, Strong coordination effect

Active Publication Date: 2020-12-18
广东极客亮技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is difficult to control the distribution of the porous structure, the distribution uniformity is poor, and the preparation efficiency is low due to the use of solvent-free dry microwave radiation, and graphene is easy to agglomerate

Method used

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  • Honeycomb porous graphene and preparation method thereof
  • Honeycomb porous graphene and preparation method thereof
  • Honeycomb porous graphene and preparation method thereof

Examples

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preparation example Construction

[0030] The invention provides a kind of preparation method of honeycomb porous graphene, comprises the following steps:

[0031] S1. Ultrasonically disperse graphene oxide sheets with a lateral size of 0.2-1 μm in a solvent, then add a metal salt solution to make it coordinate and balance in the solution, and then centrifuge to obtain graphene oxide-metal ion ligands. The carboxyl group and carbonyl group on the surface of graphene oxide are easy to form coordination bonds with metal ions, and the obtained graphene oxide-metal ion ligand has excellent microwave absorption ability.

[0032] As a further improvement of the present invention, in step S1, the graphene oxide sheet is a nitrogen-doped graphene oxide sheet. Nitrogen-doped graphene oxide sheets are selected, which have a stronger coordination with metal salts, and the prepared nitrogen-doped graphene oxide-metal ion ligands have stronger microwave absorption capabilities, so microwave irradiation plasma etching The e...

Embodiment 1

[0044] A preparation method of honeycomb porous graphene, comprising the following steps:

[0045] S1. Ultrasonic disperse graphene oxide sheets with a lateral size of 0.2 μm and a thickness of 3 nm (the carbon atomic mass content is about 80%) in deionized water, and then add Co(NO 3 ) 2 ·6H 2 O solution, after making it coordinated and balanced in the solution, centrifuged to obtain the graphene oxide-metal ion ligand;

[0046] S2. the graphene oxide-metal ion ligand is dispersed in a quartz beaker containing a mixed solvent composed of deionized water and ethanol with a volume ratio of 1:5, and then adding benzene to the quartz beaker while ultrasonically dispersing , until the volume ratio of the sum of benzene, water and ethanol is 8:1, obtaining a graphene oxide-metal ion ligand reaction solution with a concentration of 20g / L;

[0047] S3. put the quartz beaker filled with the reaction solution in step S2 in the microwave liquid phase discharge device, feed argon into...

Embodiment 2-7

[0052] A kind of preparation method of honeycomb porous graphene, compared with embodiment 1, difference is that in step S2, the volume ratio of deionized water and ethanol and the volume ratio of the sum of benzene and water and ethanol are shown in table 1 Show. Others are substantially the same as in Embodiment 1, and will not be repeated here.

[0053] Table 1 Preparation conditions and performance parameters of Examples 1-7

[0054]

[0055] It can be seen from Table 1 that with the increase of deionized water content in the solvent, the C content of the obtained honeycomb porous graphene gradually increases, indicating that the degree of reduction gradually increases, and the heteroatom defects gradually decrease, but the specific surface area also gradually increases. This may be due to the fact that water molecules are easy to absorb microwaves, resulting in the reduction of microwave absorption by graphene oxide and affecting the occurrence of microwave liquid pha...

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Abstract

The invention provides honeycomb porous graphene and a preparation method thereof. The method comprises the following steps: firstly, coordinating graphene oxide with a metal salt to improve the waveabsorbing property of the graphene oxide; then dispersing in a mixed solvent composed of water and ethanol, and after dispersion, adding a non-wave-absorbing solvent benzene or cyclohexane to preventmicrowave dissipation caused by solvent wave absorption; and finally, in a microwave liquid-phase discharge device, carrying out microwave etching on the graphene oxide metal ion ligand through microwave irradiation treatment, wherein in the process, the metal sites are preferentially etched to form nanopores, and meanwhile, hydrogen free radicals generated by microwave liquid-phase discharge areused for reducing the remaining oxidation functional groups, and finally the honeycomb porous graphene is obtained. According to the invention, high controllability of the nanopores can be realized; the preparation method is simple, not easy to agglomerate and suitable for large-scale preparation.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a honeycomb porous graphene and a preparation method thereof. Background technique [0002] Graphene is a single layer of carbon atoms tightly packed into a two-dimensional hexagonal honeycomb lattice structure, and is the thinnest material known so far. Nano-graphene microflakes are a new type of carbon nano-light material with a unique two-dimensional crystal structure of single atomic layer and huge specific surface area. Due to its ultra-high strength, electrical conductivity, thermal conductivity, reflectivity and other characteristics been extensively studied. [0003] Porous graphene, which is a nanometer-sized hole produced by physical or chemical methods in the graphene sheet, has attracted more and more attention from the perspective of theory and practical application in recent years. Its unique properties lead to a wide range of applications that cannot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/32
Inventor 曾伟荣曾伟城
Owner 广东极客亮技术有限公司
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