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Preparation method of porous graphene

A technology of porous graphene and reduction method, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of many equipments, unfavorable direct use, unsatisfactory electrical conductivity of products, etc., and achieve a simple preparation method Effect

Active Publication Date: 2019-07-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the product obtained by this preparation method is graphene with a three-dimensional structure, there are shortcomings with its preparation method. At first, the product is a freeze-dried graphene hydrogel, which is not conducive to its direct use; secondly, The electrical conductivity of the product is unsatisfactory; again, more equipment is required in the preparation

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The concrete steps of preparation are:

[0023] Step 1, according to the weight ratio of ammonium salt, glucose and deionized water is 0.6:0.8:5, the ammonium salt and glucose are dissolved in deionized water; wherein the ammonium salt is ammonium chloride to obtain a mixed solution. Then according to the weight ratio of the 1.8g / L graphene oxide aqueous solution and the ammonium salt in the mixed solution as a ratio of 10:1.2, the graphene oxide aqueous solution is added to the mixed solution and stirred, and dried into a paste at 30° C. to obtain Pasty mixture.

[0024] Step 2, first place the pasty mixture in a protective atmosphere; wherein, the protective atmosphere is an argon atmosphere. Then it was raised from room temperature to 1000°C over 2 hours, and kept for 1 hour to obtain a product similar to figure 1 As shown in Figure a and Figure b, and as figure 1 Figures c and d in the figure 2 and image 3 The porous graphene shown in the curve.

Embodiment 2

[0026] The concrete steps of preparation are:

[0027] Step 1, according to the weight ratio of ammonium salt, glucose and deionized water is 0.75:0.7:5, ammonium salt and glucose are dissolved in deionized water; wherein the ammonium salt is ammonium chloride to obtain a mixed solution. Then according to the weight ratio of the 1.9g / L graphene oxide aqueous solution and the ammonium salt in the mixed solution as a ratio of 10:1.05, the graphene oxide aqueous solution is added to the mixed solution and stirred, and dried into a paste at 35° C. to obtain Pasty mixture.

[0028] Step 2, first place the pasty mixture in a protective atmosphere; wherein, the protective atmosphere is an argon atmosphere. Then it was raised from room temperature to 975°C over 2.5h, and kept for 1.3h to obtain a product similar to figure 1 As shown in Figure a and Figure b, and as figure 1 Figures c and d in the figure 2 and image 3 The porous graphene shown in the curve.

Embodiment 3

[0030] The concrete steps of preparation are:

[0031] Step 1, according to the weight ratio of ammonium salt, glucose and deionized water is 0.9:0.6:5, ammonium salt and glucose are dissolved in deionized water; wherein the ammonium salt is ammonium chloride to obtain a mixed solution. Then according to the weight ratio of the 2g / L graphene oxide aqueous solution and the ammonium salt in the mixed solution being 10:0.9, the graphene oxide aqueous solution was added to the mixed solution and stirred, and dried at 40°C to form a paste to obtain a paste shape mixture.

[0032] Step 2, first place the pasty mixture in a protective atmosphere; wherein, the protective atmosphere is an argon atmosphere. Then it was raised from room temperature to 950°C over 3 hours, and kept for 1.5 hours to obtain the following figure 1 As shown in Figure a and Figure b, and as figure 1 Figures c and d in the figure 2 and image 3 The porous graphene shown in the curve.

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Abstract

The invention discloses a preparation method of porous graphene. The preparation method comprises the following steps: dissolving ammonium salt and glucose into deionized water according to a weight ratio of the ammonium salt to the glucose to the deionized water being (0.6 to 1.2) to (0.4 to 0.8) to 5, thus obtaining mixed liquor, then adding a 1.8 to 2.2g / L graphene oxide water solution into the mixed liquor according to a weight ratio of the graphene oxide water solution to the ammonium salt in the mixed liquor being 10 to (0.6 to 1.2), stirring, drying to form a paste shape at 30 to 50 DEG C, thus obtaining a pasty mixture, then putting the pasty mixture into a protective atmosphere, heating the pasty mixture to 900 to 1000 DEG C from room temperature through 2 to 4h, and preserving heat for 1 to 2h, thus preparing a target product, wherein the ammonium salt is ammonium chloride or ammonium carbonate or ammonium nitrate, and the protective atmosphere is an argon atmosphere or helium atmosphere or neon atmosphere. The target product prepared by the preparation method can be directly used, is higher in electrical conductivity, and is very easily and widely commercialized and applied to fields such as environmental governance and energy utilization.

Description

technical field [0001] The invention relates to a preparation method of graphene, in particular to a preparation method of porous graphene. Background technique [0002] Due to its large specific surface area and chemical stability, three-dimensional graphene has broad application prospects in environmental governance and energy utilization. Recently, people have made some beneficial attempts and efforts in order to obtain graphene with three-dimensional structure, as entitled "Self-Assembled Graphene Hydrogel via a One-Step Hydrothermal Process", Acs Nano, 2010, 4, 4324-4330 ("one-step water Thermal Self-Assembled Graphene Hydrogel", "American Chemical Society-Nano" 2010 Vol. 4 p. 4324) article. The one-step hydrothermal method described in this article is to first place the graphene oxide aqueous solution in an autoclave and keep it at 180°C for 1-12 hours, then take out the reaction solution after the autoclave is lowered to room temperature, and freeze-dry the reaction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184
CPCC01B2204/22C01B2204/32C01P2002/72C01P2002/82C01P2004/03
Inventor 韩方明孟国文
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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