A kind of preparation method of porous graphene

A porous graphene and graphene technology, applied in the field of materials engineering, can solve the problems of restricting the subsequent application of new graphene-derived materials, complex processes, and small pore size range of porous graphene, so as to be suitable for large-scale industrial production and simple process , the effect of a wide range of pore size distribution

Active Publication Date: 2016-01-27
暴宁钟
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of preparation method of porous graphene
  • A kind of preparation method of porous graphene

Examples

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Effect test

Embodiment 1

[0023] 1) Preparation of porous graphene oxide:

[0024] Take 0.02g graphite oxide and prepare 100ml solution with a concentration of 0.2g / L, and sonicate it at 20kHz frequency for 30min to obtain graphene oxide (GO) solution. Then the solution was centrifuged at 10000rpm to collect the GO colloid at the bottom, and the GO colloid was mixed with 200ml of 70% nitric acid solution, ultrasonicated for 30min at 15kHz frequency, and then deionized water was added. The centrifuge was washed repeatedly 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] The porous graphene oxide solid obtained in step 1 was prepared into a 1L solution with a mass concentration of 0.01g / L, and 0.05g sodium borohydride was added to the graphene oxide solution, and reacted at a temperature of 100°C for 6h to obtain a porous The graphene dispersion liquid is filtered, washed, and fre...

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 sonicate it at a frequency of 40kHz for 60min to obtain a graphene oxide (GO) solution. Then the solution was centrifuged at 12000rpm to collect the bottom GO colloid, mix the GO colloid with 15ml of 40% hydrofluoric acid solution, sonicate at 28kHz frequency for 60min, then add deionized water, and centrifuge repeatedly at the same speed Wash, wash the system to a pH of 5, and freeze-dry to obtain graphene oxide solid with nanopores.

[0031] 2) Preparation of porous graphene:

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

Embodiment 3

[0034] 1) Preparation of porous graphene oxide:

[0035] Take 0.3 g of graphite oxide, prepare 60 ml of a solution with a concentration of 5 g / L, and sonicate it for 100 min at a frequency of 50 kHz to obtain a graphene oxide (GO) solution. Then the solution was centrifuged at 15000rpm to collect the GO colloid at the bottom, and the GO colloid was mixed with 150ml of nitric acid solution with a mass concentration of 68%, sonicated at 60kHz for 120min, then added deionized water, and washed repeatedly at the same speed. The system was washed to a pH of 6, and freeze-dried to obtain graphene oxide solid with nanopores.

[0036] 2) Preparation of porous graphene:

[0037] The porous graphene oxide solid obtained in step 1 was prepared into a 50ml solution with a mass concentration of 5g / L, and 15ml hydrazine hydrate aqueous solution containing 0.25g hydrazine hydrate was added to the graphene oxide solution and reacted at a temperature of 50°C After 10 hours, a porous graphene disper...

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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, and particularly relates to a method for preparing graphene-derived material porous graphene. Background technique [0002] Graphene was discovered in 2004 by Andre Heim of the University of Manchester in the United Kingdom. The material received widespread attention from the scientific community immediately after its publication. Graphene is a single layer of carbon atoms densely packed into a two-dimensional hexagonal honeycomb lattice structure, and is currently the thinnest material known. The special hexagonal honeycomb structure of graphene contains rich and novel physical phenomena. It not only has excellent electrical properties (the electron mobility can reach 2×10 at room temperature). 5 cm 2 ·V -1 ·S -1 ), outstanding thermal conductivity (5000W·m -1 ·K -1 ), ultra-high specific surface area (2630m 2 ·G -1 ), and its Young's modulus (1100GPa) and breaking strength (125GPa) are also compa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04B82Y30/00B82Y40/00C01B32/19
Inventor 暴宁钟何大方
Owner 暴宁钟
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