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Preparation method of porous graphene

A technology of porous graphene and graphene, applied in the field of materials engineering, can solve the problems of small pore size range of porous graphene, limit the subsequent application of new graphene-derived materials, complex process, etc., achieve a large pore size distribution range, suitable for large-scale The effect of industrial production and simple process

Active Publication Date: 2014-03-26
暴宁钟
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are few reports about the preparation of porous graphene. The only method uses potassium hydroxide to chemically activate porous graphene under high temperature and inert atmosphere. Very small, only porous graphene with a pore size of 0.5-5nm can be prepared, which severely limits the subsequent application of this new graphene-derived material

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  • Preparation method of porous graphene
  • Preparation method of porous graphene

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Embodiment 1

[0023] 1) Preparation of porous graphene oxide:

[0024] Take 0.02g of graphite oxide, prepare 100ml of a solution with a concentration of 0.2g / L, and ultrasonicate at a frequency of 20kHz for 30min to obtain a graphene oxide (GO) solution. Then the solution was centrifuged at 10,000rpm to collect the GO colloid at the bottom, mix the GO colloid with 200ml of nitric acid solution with a mass concentration of 70%, ultrasonicate at a frequency of 15kHz for 30min, then add deionized water, and repeatedly centrifuge and wash at the same speed. The system was washed to a pH of 4, and freeze-dried to obtain a porous graphene oxide solid with nanopores.

[0025] 2) Preparation of porous graphene:

[0026] Prepare the porous graphene oxide solid obtained in step 1 into 1 L of a solution with a mass concentration of 0.01 g / L, add 0.05 g of sodium borohydride to the graphene oxide solution, and react at a temperature of 100 ° C for 6 h to obtain a porous Graphene dispersion liquid, fi...

Embodiment 2

[0029] 1) Preparation of porous graphene oxide:

[0030] Take 0.015g of graphite oxide, prepare 1.5L of a solution with a concentration of 0.01g / L, and ultrasonicate at a frequency of 40kHz for 60min to obtain a graphene oxide (GO) solution. Then the solution was centrifuged at 12,000rpm to collect the GO colloid at the bottom, mixed with 15ml of 40% hydrofluoric acid solution, ultrasonicated at 28kHz for 60min, then deionized water was added, and centrifuged repeatedly at the same speed Washing, washing the system until the pH is 5, and freeze-drying to obtain a graphene oxide solid with nanopores.

[0031] 2) Preparation of porous graphene:

[0032] The porous graphene oxide solid obtained in step 1 is formulated into 20ml of a solution with a mass concentration of 0.5g / L, 0.2g of ascorbic acid is added to the graphene oxide solution, and the temperature is 80°C for 10 minutes to react to obtain porous graphite Graphene dispersion, filtered and washed, and freeze-dried to ...

Embodiment 3

[0034] 1) Preparation of porous graphene oxide:

[0035] Take 0.3g of graphite oxide, prepare 60ml of a solution with a concentration of 5g / L, and ultrasonicate at a frequency of 50kHz for 100min to obtain a graphene oxide (GO) solution. Then the solution was centrifuged at 15,000rpm to collect the GO colloid at the bottom, mix the GO colloid with 150ml of nitric acid solution with a mass concentration of 68%, ultrasonicate at a frequency of 60kHz for 120min, then add deionized water, and repeatedly centrifuge and wash at the same speed. The system was washed to a pH of 6, and freeze-dried to obtain a graphene oxide solid with nanopores.

[0036] 2) Preparation of porous graphene:

[0037] The porous graphene oxide solid obtained in step 1 is formulated into 50ml of a solution with a mass concentration of 5g / L, and 15ml of hydrazine hydrate aqueous solution containing 0.25g of hydrazine hydrate is added to the graphene oxide solution, and the temperature is 50°C for reaction ...

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Abstract

The invention provides a preparation method of porous graphene. The preparation method comprises the following steps: preparation of porous graphene oxide: ultrasonically dispersing a graphite oxide solution to obtain a graphene oxide solution; centrifugalizing to obtain a colloidal precipitation; mixing the colloidal precipitation and strong acid, carrying out ultrasonic reaction, washing till the pH is 4-6, and freeze-drying to obtain the porous graphene oxide; and preparation of the porous graphene: reacting a reducing agent and the porous graphene oxide to obtain the porous graphene. According to the method, the aperture of the prepared porous graphene is uniform by combining strong acid corrosion with ultrasonic action, can be regulated within a range from dozens of nanometers to several micrometers as required and is large in aperture distribution range. The method provided by the invention has the advantages of simple process, high preparation efficiency, low cost and suitability for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of material engineering, in particular to a method for preparing porous graphene, a graphene-derived material. Background technique [0002] Graphene was discovered in 2004 by Andre Heim of the University of Manchester in the United Kingdom, and the material received widespread attention from the scientific community immediately after it was announced. 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. The special hexagonal honeycomb structure of graphene contains rich and novel physical phenomena, and it not only has excellent electrical properties (electron mobility at room temperature can reach 2×10 5 cm 2 ·V -1 ·s -1 ), outstanding thermal conductivity (5000W·m -1 ·K -1 ), super high specific surface area (2630m 2 g -1 ), while its Young's modulus (1100GPa) and breaking strength (125GPa) are also...

Claims

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Application Information

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IPC IPC(8): C01B31/04B82Y30/00B82Y40/00C01B32/19
Inventor 暴宁钟何大方
Owner 暴宁钟
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