High specific surface area of silicon oxide hybridized graphene aerogel and production method thereof

A technology of graphene airgel and high specific surface area, which is applied in the field of graphene airgel, can solve the problem of reducing specific surface area, and achieve the effect of high specific surface area, small silicon oxide particles, and small particle size

Active Publication Date: 2015-08-26
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a high specific surface area silicon oxide hybrid graphene aerogel and its preparation method

Method used

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  • High specific surface area of silicon oxide hybridized graphene aerogel and production method thereof
  • High specific surface area of silicon oxide hybridized graphene aerogel and production method thereof
  • High specific surface area of silicon oxide hybridized graphene aerogel and production method thereof

Examples

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Embodiment 1

[0034](1) 3g graphite powder is mixed with 18g potassium permanganate, 40ml concentrated phosphoric acid is mixed with 360ml concentrated sulfuric acid to obtain mixed acid, and gained mixed acid is added to gained graphite powder / In the potassium permanganate mixture, heat up to 50°C and react for 12 hours under a mechanical stirring condition of 300r / min, add the reaction mixture to 400ml of ice water containing 10ml of 30% hydrogen peroxide, and centrifuge at a speed of 2000r / min to obtain For the extract, dissolve the extract in 200ml of deionized water and centrifuge at a speed of 2000r / min for 1h, then dissolve the extract in 200ml of 30% hydrochloric acid and centrifuge for 1h at a speed of 2000r / min, and finally Dissolve the extract in 200ml of ethanol and centrifuge at a speed of 2000r / min for 1h, repeat the process of dissolving the extract in 200ml of ethanol and centrifuge at a speed of 2000r / min for 3 times, take the extract and dry it in vacuum at 50°C to obtain ...

Embodiment 2～36

[0046] The process parameters used in Examples 2 to 36 are shown in Table 1, and the process is the same as in Example 1, except that the type of siloxane, the ratio of deionized water to graphene oxide, the ratio of siloxane to oxidized The ratio of the number of graphene dispersions and other three parameters that have a greater impact on the performance of the high specific surface area silicon oxide hybrid graphene airgel, except for the process parameters written in the table, the rest of the process parameters are the same as in Example 1.

[0047] Table 1 Preparation process parameters and properties of high specific surface area silicon oxide hybrid graphene aerogels prepared in Examples 2-36

[0048]

[0049]

Embodiment 37

[0051] The difference between embodiment 37 and embodiment 1 lies in the fourth step, and the rest of the process parameters are the same as embodiment 1. The fourth step in Example 37 is: replace the hybrid graphene gel obtained in step (3) with 10 times the volume of deionized water and ethanol for 10 times, each replacement time is 6h, to obtain the silicon oxide after solvent replacement hybrid graphene gel, and then put the silica hybrid graphene gel after solvent replacement into CO 2 In the drying kettle of the supercritical drying device, then the supercritical CO 2 , replaced for 5 hours, and finally release the pressure at a rate of 100KPa / min, and cool down with the furnace to obtain silicon oxide hybrid graphene airgel with high specific surface area.

[0052] The SEM photo of the high specific surface area silicon oxide hybrid graphene airgel that embodiment 37 obtains is as follows Figure 4 As shown, the particles are silicon oxide particles, and the transluce...

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Abstract

The invention discloses high specific surface area of silicon oxide hybridized graphene aerogel and a production method thereof. The high specific surface area of silicon oxide hybridized graphene aerogel and the production method aim at solving the problem that the specific surface area is reduced when hybridization is performed on graphene aerogel. The high specific surface area of silicon oxide hybridized graphene aerogel is formed by grapheme through building, wherein a large quantity of silicon oxide particles are distributed on the surface of the grapheme; the high specific surface area of silicon oxide hybridized graphene aerogel comprises a porous structure, wherein the pore diameter of the porous structure is concentrated to be 1 to 500 nm; the porous structure comprises a microporous structure and a macroporous structure. The production method comprises serving graphite powder, siloxane and the like as main raw materials, producing graphene oxide, preparing a graphene oxide dispersing agent and producing silicon oxide hybridized graphene gel and obtaining the high specific surface area of silicon oxide hybridized graphene aerogel after drying. According to the high specific surface area of silicon oxide hybridized graphene aerogel and the production method thereof, tiny particle size of silicon oxide nanoparticles are produced through liquid mixing of the raw materials and a reaction, the introduction on the silicon oxide particles is implemented, meanwhile the partition effect on the grapheme is achieved, and accordingly the high specific surface area of silicon oxide hybridized graphene aerogel is large in specific surface area, small in silicon oxide particle and uniform in distribution.

Description

technical field [0001] The invention relates to a graphene airgel, in particular to a silicon oxide hybrid graphene airgel with a high specific surface area and a preparation method thereof. technical background [0002] Graphene airgel is a three-dimensional porous structure material formed by overlapping graphene. This material has a series of characteristics such as ultra-light, high elasticity, large specific surface area, and high electrical and thermal conductivity. It is used in catalysis, electrochemistry, energy, Sensors, supercapacitors, adsorption, thermal control, and many other fields have great application potential. However, due to some of its own characteristics, the application of graphene airgel alone in some fields is greatly limited. [0003] It is a relatively common practice to modify graphene aerogels by other compounds. There have been a large number of literature reports on this method and its effects. The results show that modification can indeed i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 冯军宗岳晨午冯坚姜勇刚
Owner NAT UNIV OF DEFENSE TECH
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