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Method for preparation of graphene/carbon aerogel composite material

A composite material, carbon aerogel technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems affecting the combination of carbon aerogel and graphene, and achieve the effect of promoting application development, improving conductivity, and improving uniformity

Inactive Publication Date: 2017-10-17
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene oxide is prone to aggregation in the local area of ​​the precursor of carbon aerogel, which needs to be dispersed and stirred; in addition, the surface of graphene oxide contains oxidized functional groups, which will form gas precipitation during the subsequent heat treatment process, affecting the relationship between carbon aerogel and carbon aerogel. Graphene bonding

Method used

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  • Method for preparation of graphene/carbon aerogel composite material
  • Method for preparation of graphene/carbon aerogel composite material
  • Method for preparation of graphene/carbon aerogel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take graphene oxide, put it into deionized water, and ultrasonically disperse it to obtain a graphene oxide dispersion with a concentration of 3mg / ml, put it into a hydrothermal reactor, seal it, and treat it at 180°C for 24 hours to obtain a reduced graphene hydrogel glue, freeze-dried to obtain reduced graphene foams.

[0033] Get resorcinol and formaldehyde, the molar ratio is 0.5, add in deionized water and mix evenly, control the solution concentration to be 40%, add catalyst sodium carbonate again, the molar ratio of catalyst and resorcinol is 1 / 1000, stir evenly, Obtain the carbon airgel liquid precursor.

[0034] Then put the graphene foam into a polytetrafluoro container with a sealed cover. The inner cavity of the container is similar in size to the graphene foam. Slowly add the carbon airgel liquid precursor through the needle until the liquid precursor is covered by the graphene foam. On the upper surface, the graphene foam is completely immersed in the liq...

Embodiment 2

[0036] Take graphene oxide, prepare it into a 3mg / ml solution, and disperse it ultrasonically for 7 minutes to obtain a graphene oxide dispersion, add ethylenediamine at a ratio of 12500:1 to obtain a mixed solution, drop the solution into a plastic container, and seal it for 95 °C, treated for 24 hours, the reduced graphene oxide group grows into a foam, and then the wet foam is freeze-dried to obtain a reduced graphene foam.

[0037] Get resorcinol and formaldehyde, the molar ratio is 0.5, add in deionized water and mix evenly, control the solution concentration to be 40%, add catalyst sodium carbonate again, the molar ratio of catalyst and resorcinol is 1 / 1000, stir evenly, Obtain the carbon airgel liquid precursor.

[0038] Then the graphene foam is immersed in the gel liquid precursor, vacuumed to 0.1 Pa, and after 5 minutes, impregnated and compounded. Then seal the impregnated composite graphene foam, place it in an oven, and keep the temperature at 50°C for 1 day to o...

Embodiment 3

[0039] Embodiment 3 evaluates the optimization to material by electrochemical performance test:

[0040]The material prepared in Example 1 of the present invention is applied to a supercapacitor. Take 0.85 g of this product, add 0.15 g of polytetrafluoroethylene, add ethanol dropwise, mix evenly, roll it into thin slices on stainless steel, and punch it into a diameter of about 10 mm with steel. Circular flakes with a weight of 2-10 mg are used as supercapacitor electrode sheets, and the electrode sheet is pressed on the nickel foam current collector with foam nickel, 6 mol L -1 Potassium hydroxide (KOH) aqueous solution is used as electrolyte, cyclic voltammetry scan, scan window -1~0 V (vs. Hg / HgO), the curve is an approximately symmetrical rectangle, as shown in the attached image 3 shown. At a scan rate of 2 mV s -1 , calculated according to the integral area of ​​the curve, the capacity of the supercapacitor is 144F·g -1 .

[0041] Compared with the carbon airgel ma...

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Abstract

The invention discloses a method for preparation of a graphene / carbon aerogel composite material. The method comprises: oxidized grapheme is used as a raw material and reduction and assembling are carried out by a liquid phase to obtain a reduced graphene foam; vacuum impregnation is carried out and composite processing is carried out on a carbon aerogel precursor and the reduced graphene foam; and then polymerization, drying, pyrogenic decomposition, and activation are carried out to obtain a graphene / carbon aerogel composite material. The method has the following advantages: on the basis of the vacuum impregnation composite process, grapheme and carbon aerogel are composited uniformly. During the process, the simple equipment is needed; and the process is stable. The method has the broad large-scale preparation prospects.

Description

technical field [0001] The invention relates to a method for preparing a graphene / carbon airgel composite material, belonging to the technical field of nano-carbon material application. Background technique [0002] Graphene, as a single atomic layer two-dimensional nanomaterial, has large specific surface area, high conductivity and multifunctional properties. However, the two-dimensional layered structure has a large interaction force and is easy to be stacked, resulting in a decrease in the specific surface area, which affects the application. It is an effective way to intercalate the second phase between the graphenes, space the graphenes, avoid graphene stacking, and increase the graphene action area. At present, loading the second phase on the surface of graphene is a conventional technical means, including loading oxides, sulfides, and organic substances on the surface of graphene to make nanocomposites. Alternatively, the nano-liquid phase mixing method is used to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/34H01G11/36
CPCY02E60/13H01G11/24H01G11/34H01G11/36
Inventor 冯建民裴家辉李德军
Owner TIANJIN NORMAL UNIVERSITY
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