Preparation method and application of three-dimensional porous graphene sheet

A graphene sheet, three-dimensional porous technology, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of complicated process, poor product quality, expensive equipment, etc., and achieve simple process, low cost and high application The effect of value enhancement

Inactive Publication Date: 2018-05-08
HAINAN UNIVERSITY
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Problems solved by technology

The commonly used methods for preparing graphene generally have many practical

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  • Preparation method and application of three-dimensional porous graphene sheet
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  • Preparation method and application of three-dimensional porous graphene sheet

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[0039] A method for preparing a three-dimensional porous graphene-like sheet, wherein the three-dimensional porous graphene-like sheet is prepared by a low-temperature graphite method, comprising the following steps:

[0040] Step 1: Separate the inner shell of the biomass, crush it, and sieve to select the powder below 100 microns;

[0041] Step 2: Put the powder obtained in step 1 into a tube furnace and slowly heat up to 350-900°C under the protection of nitrogen to carbonize, and cool to obtain biochar;

[0042] Step 3: Mix and grind the biochar obtained in Step 2 with the catalyst, then slowly raise the temperature to 850-1000°C under a nitrogen atmosphere to react, complete graphitization, and take it out after cooling;

[0043] Step 4: Wash the sample obtained in step 3 to neutrality with deionized water;

[0044] Step 5: put the sample obtained in step 4 into dilute hydrochloric acid and stir;

[0045] Step 6: Wash the sample obtained in step 5 with deionized water a...

Embodiment 1

[0053] (1) First separate the inner shell of the coconut shell, then crush it, and sieve to select the powder below 100 microns; put the powder obtained in the above step (1) in a tube furnace, and heat it at 10°C / min under the protection of nitrogen. Raise the temperature to 400°C, then carbonize for 3 hours, and then cool naturally to obtain biochar; mix the biochar obtained in the above step (2) with potassium carbonate at a ratio of 1:6, grind it in a mortar for 5 minutes, and then dry it under a nitrogen atmosphere 10°C / min to raise the temperature to 900°C for 2 hours, take it out after natural cooling; wash the sample taken out in the above step (3) with deionized water to neutrality; put the sample taken out in the above step (4) into 2wt% dilute Stir in hydrochloric acid for 12 hours; the sample taken out in the above step (5) is washed again with deionized water until neutral; the product obtained in the above step (6) is put into a blast drying oven and dried for 12 ...

Embodiment 2

[0055](1) First separate the inner shell of the coconut shell, then pulverize it, and sieve to select the powder below 100 microns; put the powder obtained in the above step (1) in a tube furnace, and heat it at 10°C / min under the protection of nitrogen. Raise the temperature to 500°C, then carbonize for 3 hours, then cool naturally to take out the biochar; mix the biochar obtained in the above step (2) with potassium carbonate at a ratio of 1:6, grind it in a mortar for 5 minutes, and then in a nitrogen atmosphere 10°C / min to raise the temperature to 900°C for 2 hours, take it out after natural cooling; wash the sample taken out in the above step (3) with deionized water to neutrality; put the sample taken out in the above step (4) into 2wt% dilute Stir in hydrochloric acid for 12 hours; the sample taken out in the above step (5) is washed again with deionized water until neutral; the product obtained in the above step (6) is put into a blast drying oven for drying for 12 hour...

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Abstract

The invention discloses a preparation method and application of a three-dimensional porous graphene sheet. In the preparation method, by adopting a low-temperature graphite method and using coconut materials, walnut shells, hazelnut shells, pistachio nut shells and other biomass materials and alkali metal carbonate serving as a catalyst, the three-dimensional porous graphene material high in purity and good in morphology is obtained, wherein the specific surface area of the three-dimensional porous graphene material reaches up to 1506 m<2>/g, and the specific capacitance reaches 91 F/g when the material is applied to an organic system supercapacitor. According to the preparation method, biomass which is abundant in the nature is adopted as raw materials, the synthesis process is environmentally friendly and free of pollution, the prepared product has the advantages of high purity, few defects, good graphene lattices, high electrical conductivity and high specific surface area, and an ideal synthesis process is provided for synthesis of graphene materials.

Description

technical field [0001] The invention relates to the field of graphene preparation, in particular to a preparation method and application of a three-dimensional porous graphene-like sheet. Background technique [0002] Biomass materials are carbon materials prepared by solid-phase pyrolysis. The biochar is a carbon material with a hard carbon structure. Because the graphite microchip layer in hard carbon is too small, the sp 3 The cross-linking of carbon atoms is too strong, resulting in the low specific surface area and electrical conductivity of hard carbon, and it is very difficult to achieve graphitization. The graphene material has a large-area six-membered ring lattice, has very good electrical conductivity and a higher specific surface area, and can provide a large number of reaction sites for many physical and chemical reactions. substitute role. The commonly used methods for preparing graphene generally have many practical problems such as complex process, expensiv...

Claims

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Application Information

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IPC IPC(8): C01B32/184
CPCC01B2204/22C01B2204/32C01P2002/01C01P2002/80C01P2004/03C01P2004/04C01P2006/17
Inventor 陈永夏靳松孙成华
Owner HAINAN UNIVERSITY
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