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Graphene oxide reinforced carbon aerogel material, and preparation method and application thereof

A technology of carbon airgel and graphene, which is applied in the direction of carbon preparation/purification, chemical instruments and methods, and other chemical processes, can solve the problems of carbon gel shrinkage, collapse, and RF concentration can not be too high, and achieve excellent Adsorption performance, maintenance of pore structure, effect of increasing hydrophobicity

Inactive Publication Date: 2015-05-13
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this preparation method takes a long time, and it takes 5-8 days from gelation to solvent exchange to drying
In addition, if it is desired to obtain carbon gels with low density and high specific surface area, the RF concentration should not be too high during the preparation of wet gels, resulting in low skeleton strength of RF gels.
In the case of direct drying, the large surface tension of water will cause the pores in the gel to collapse, and the obtained carbon gel will shrink greatly, so it needs to be dried with supercritical carbon dioxide after solvent exchange, which greatly increases energy consumption and cost

Method used

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  • Graphene oxide reinforced carbon aerogel material, and preparation method and application thereof
  • Graphene oxide reinforced carbon aerogel material, and preparation method and application thereof
  • Graphene oxide reinforced carbon aerogel material, and preparation method and application thereof

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Effect test

Embodiment 1

[0026] (1) In parts by weight, add 1 part of powdered natural graphite and 0.5 parts of sodium nitrate into the reactor to cool to 0°C; then slowly add 40 parts of concentrated sulfuric acid into the reactor and stir for 0.5 hours, and keep the reaction system The temperature is 0-5°C; then, add 0.3 parts of potassium permanganate into the reactor and fully stir for 0.5h, while maintaining the temperature of the reaction system at 5-10°C; within 1h, slowly add 3.5 parts of potassium permanganate into the reaction In the container, keep the temperature of the reaction system at 15-20°C, remove the cooling bath, heat the reaction system to 35°C with a water bath, and fully stir for 2 hours to obtain a brown suspension. Slowly add 45 parts of pure water dropwise to the brown suspension, and react at 90°C for 15 minutes. After the reaction, add 3 parts of 30% H to the suspension. 2 o 2 With 20 parts of pure water to obtain a bright yellow graphite oxide dispersion. After the dis...

Embodiment 2

[0032] (1) In parts by weight, add 1 part of powdered natural graphite and 0.3 parts of sodium nitrate into the reactor to cool to 0°C; then slowly add 45 parts of concentrated sulfuric acid into the reactor and stir for 0.7 hours, and keep the reaction system The temperature is 0-5°C; then, add 0.5 parts of potassium permanganate into the reactor and fully stir for 0.3h, while maintaining the temperature of the reaction system at 5-10°C; within 1h, add 4 parts of potassium permanganate slowly In the reactor, keep the temperature of the reaction system at 15-20°C, remove the cooling bath, heat the reaction system to 40°C with a water bath, and fully stir for 2 hours to obtain a brown suspension. Slowly add 50 parts of pure water dropwise into the brown suspension, and react at 95°C for 10 minutes. After the reaction, add 2 parts of 30% H to the suspension. 2 o 2 With 30 parts of pure water to obtain a bright yellow graphite oxide dispersion. After the dispersion liquid is fi...

Embodiment 3

[0037](1) In parts by weight, add 1 part of powdered natural graphite and 0.7 parts of sodium nitrate into the reactor to cool to 0°C; then slowly add 35 parts of concentrated sulfuric acid into the reactor and stir for 0.3 hours, and keep the reaction system constant The temperature is 0-5°C; then, add 0.2 parts of potassium permanganate into the reactor and fully stir for 0.7h, while maintaining the temperature of the reaction system at 5-10°C; within 1h, slowly add 3 parts of potassium permanganate into the reaction In the container, keep the temperature of the reaction system at 15-20°C, remove the cooling bath, heat the reaction system to 30°C with a water bath, and fully stir for 3 hours to obtain a brown suspension. Slowly add 40 parts of pure water dropwise to the brown suspension, and react at 85°C for 20 minutes. After the reaction, add 4 parts of 30%H to the suspension. 2 o 2 With 20 parts of pure water to obtain a bright yellow graphite oxide dispersion. After th...

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Abstract

The invention belongs to the field of material preparation, and discloses a graphene oxide reinforced carbon aerogel material, and a preparation method and an application thereof. The preparation method of the material comprises the following steps of, by weight, dissolving 40-20 parts of resorcinol in 80-95 parts of purified water, adding 0.008-0.07 part of a catalyst, mixing the above materials, adding 10-40 parts of a graphene oxide aqueous solution with a mass percentage of 1%; finally adding 6-29 parts of a formaldehyde solution, sealing a gel, drying the gel to obtain a xerogel, and carbonizing the xerogel, so that the graphene oxide reinforced carbon aerogel material is obtained. The preparation method is in no need of solvent exchange, thereby reducing energy consumption. Besides, the time needed by the whole preparation process is shorter than that of a common preparation method; and the process is simpler. Moreover, the carbon aerogel material with low density (the lowest density can reach 0.02g / cm<-3>) and high specific surface area (the highest specific surface area can reach 1,100 m<2>) / g) can be obtained with no need of carbon dioxide supercritical drying.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a graphene oxide reinforced carbon airgel material and its preparation method and application. Background technique [0002] Carbon airgel material refers to a low-density, high-porosity carbon material obtained by carbonizing organic gels. It is widely used in the fields of adsorption, catalysis, battery electrode materials and supercapacitors. Resorcinol-formaldehyde (RF)-based carbon gels have been widely used due to their high porosity, low resistivity, high specific surface area, excellent electrical conductivity, as well as thermal stability and mechanical strength. The common method of preparing carbon airgel from RF gel is to mix resorcinol and formaldehyde at a molar ratio of 1:2, add catalysts such as potassium carbonate, acetic acid, etc., prepare a solution with a certain concentration and react at a certain temperature to obtain wet condensation. Glue, wet gel t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02B01J20/291B01J20/30C01B32/05
Inventor 廖兵刘军邓理郭庆祥曾繁馨
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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