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Preparation method of porous graphene active carbon material as well as product and application thereof

A technology of graphene and activated carbon, which is applied in the field of materials, can solve problems such as the difficulty of electrolyte entering the pores, the difficulty of destroying the interlayer force of carbon materials, and the easy hardening of carbon materials, so as to improve hydrophilicity and enhance energy storage Performance, the effect of improving conductivity

Inactive Publication Date: 2018-01-09
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although such a preparation method will obtain abundant micropores, high specific surface area (≥1000m 2 g -1 ) and excellent adsorption performance, but carbon materials prepared at high temperature still have the problem of easy hardening
Generally, these activated carbon materials are used in energy conversion and energy storage, the main problem lies in the large density and thick structure of bulk carbon materials, and the electrolyte is difficult to enter the pores
The post-processing carbon material can only punch holes on the surface of the carbon material, and it is difficult to destroy the force between the carbon material layers

Method used

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  • Preparation method of porous graphene active carbon material as well as product and application thereof
  • Preparation method of porous graphene active carbon material as well as product and application thereof
  • Preparation method of porous graphene active carbon material as well as product and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of porous graphene-like activated carbon materials

[0038] (1) Hydrogen peroxide and acetic acid are added to deionized water together with the lotus powder, wherein the consumption of hydrogen peroxide is 3.5wt% of the lotus powder, the consumption of acetic acid is 15wt% of the lotus powder, ultrasonically obtains the suspension, and the After the suspension was transferred to the high-temperature reaction kettle, it was reacted at 120°C for 2 hours in a blast drying oven. After the reaction kettle was naturally cooled, the reaction product in the reaction kettle was taken out, and the reaction product was washed with secondary water and absolute ethanol in turn. Dry in a vacuum oven to obtain an intermediate product.

[0039] (2) The intermediate product obtained in step (1) was reacted at 700° C. for 3 hours at a heating rate of 2° C. / min under the protection of argon to prepare a porous graphene-like activated carbon material.

Embodiment 2

[0041] Preparation of porous graphene-like activated carbon materials

[0042] (1) Sodium perchlorate and hypochlorous acid are added to deionized water together with the straw powder, wherein the consumption of sodium perchlorate is 6wt% of the lotus powder, and the consumption of hypochlorous acid is 10wt% of the straw, and the suspension is obtained by ultrasonic , transfer the suspension to a high-temperature reaction kettle and react in a blast drying oven at 100°C for 6 hours. After the reaction kettle is naturally cooled, take out the reaction product in the reaction kettle, and wash the reaction product with secondary water and absolute ethanol in sequence. The reaction product was then dried in a vacuum oven to obtain an intermediate product.

[0043](2) The intermediate product obtained in step (1) was reacted at 800° C. for 5 h at a heating rate of 0.5° C. / min under nitrogen protection to prepare a porous graphene-like activated carbon material.

Embodiment 3

[0045] Preparation of porous graphene-like activated carbon materials

[0046] (1) Chlorine water and carbonic acid are added to deionized water together with peanut shells, wherein the consumption of chlorine water is 1.5wt% of peanut shells, the consumption of carbonic acid is 30wt% of peanut shells, ultrasonically obtains a suspension, and the suspension is After transferring to the high-temperature reaction kettle, react in a blast drying oven at 90°C for 0.5h. After the reaction kettle is naturally cooled, take out the reaction product in the reaction kettle, wash the reaction product with secondary water and absolute ethanol in turn, and place it in a vacuum Dry in a drying oven to obtain an intermediate product.

[0047] (2) The intermediate product obtained in step (1) was reacted at 1000° C. for 2 hours at a heating rate of 5° C. / min under the protection of argon to prepare a porous graphene-like activated carbon material.

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Abstract

The invention relates to a preparation method of a porous graphene active carbon material as well as a product and application thereof, and belongs to the technical field of materials. The method comprises the following steps: pretreating a biomass material with an oxidant and weak acid or salt under a condition of hydrothermal assistance to realize stripping and pore forming of the biomass material, and then performing high-temperature pyrolysis to convert the biomass material into a carbon material. The method is easy to operate; the finally prepared carbon material is high in graphitizationdegree, and also has the characteristics of high specific surface area, rich mesoporous and micropore porosity, unique layered structure and heteroatomic doping. The material is applied to a supercapacitor; an electrochemical test result shows that compared with a common active carbon material for the supercapacitor, the material has the advantages that the capacity is 4.5 times that of the common active carbon material; the material is widely applied to the fields of energy storage and conversion, electric catalysis, biosensing, environmental purification and the like, and has an important application value.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a porous graphene-like activated carbon material and its product and application. Background technique [0002] With the excessive consumption of traditional fossil energy and the increasingly serious environmental damage and pollution caused by the use of fossil energy, the research direction of developing new, environmentally friendly, sustainable, and energy-efficient clean energy conversion and storage devices to replace traditional devices has attracted much attention. researchers' attention. In recent years, carbon materials with different nanostructures, such as carbon black, carbon nanotubes, activated carbon, carbon aerogels, and carbide-derived carbons, have found widespread applications in multiple fields, especially in energy conversion and energy storage. This is attributed to the large specific surface area, excellent electrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19H01G11/32H01G11/26H01G11/86
CPCY02E60/13
Inventor 李长明陆世玉金梦
Owner SOUTHWEST UNIVERSITY
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