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Method for preparing boron-nitrogen co-doped carbon aerogel

A carbon aerogel and aerogel technology, applied in the direction of nano-carbon, nanotechnology, etc., can solve the problems of reducing electric double layer overlap, low density, high cost, etc.

Active Publication Date: 2018-02-02
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] According to previous reports, carbon aerogels have a high specific surface area (400-1100m 2 g -1 ), higher conductivity (25-100Scm -1 ), lower density (-1 ), and higher porosity, the pore diameter is dominated by mesoporous carbon, which is convenient for the transport and storage of ions, reduces the overlap of the electric double layer, and avoids the formation of an excessively thick electric double layer. Its excellent performance makes it There are multiple uses; one of the main problems in the practical application of carbon aerogels is the relatively high cost and complicated preparation process, which is related to the use of freeze-drying or supercritical drying in the synthesis process. Freeze-drying or supercritical drying Long cycle, complex process, high processing cost

Method used

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  • Method for preparing boron-nitrogen co-doped carbon aerogel
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  • Method for preparing boron-nitrogen co-doped carbon aerogel

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Embodiment 1

[0027] Embodiment 1: adopt resorcinol (R), formaldehyde (F), boric acid (B), melamine (M), graphene oxide (GO) to be reactant, anhydrous sodium carbonate (C) is catalyst, deionized Water (DI) is the solvent, according to R / F=1:2, R / C=200:1, R / B=1:0.1, B / M=2.4:1, the dry weight of GO and the total dry weight of the reaction system The weight ratio is 0.01, and the total solid content of the reaction system is 20wt%. Mix and stir resorcinol, boric acid, and DI, condense and reflux, and react at 180°C for 30 minutes; mix and stir melamine and formaldehyde solution, and heat at 80°C React for 30 minutes; cool the reacted solution, mix and stir, add anhydrous sodium carbonate, and stir evenly; ultrasonicate 1.4wt% GO solution for 30 minutes, add it to the mixed solution, stir evenly, pour it into an ampepin and seal it. Cross-linking reaction at 90°C for 48 hours to obtain an organogel; then drying at 90°C for 12 hours to obtain an organic aerogel; after that, the organoaerogel was...

Embodiment 2

[0029]Embodiment 2: adopt resorcinol (R), formaldehyde (F), boric acid (B), melamine (M), graphene oxide (GO) to be reactant, anhydrous sodium carbonate (C) is catalyst, deionized Water (DI) is the solvent, according to R / F=1:2, R / C=200:1, R / B=1:1.2, B / M=2.4:1, the dry weight of GO and the total dry weight of the reaction system The weight ratio is 0.01, and the total solid content of the reaction system is 20wt%. Mix and stir resorcinol, boric acid, and DI, condense and reflux, and react at 180°C for 60 minutes; mix and stir melamine and formaldehyde solution, and stir at 80°C React for 30 minutes; cool the two reacted solutions, mix and stir, add anhydrous sodium carbonate, and stir evenly; ultrasonicate the 1.4wt% GO solution for 30 minutes, add it to the mixed solution, stir evenly, pour it into the ampepin and seal it, Cross-linking at 90°C for 48 hours to obtain an organogel; then drying at 90°C for 48 hours to obtain an organoaerogel; after that, place the organoaerogel...

Embodiment 3

[0031] Embodiment 3: adopt resorcinol (R), formaldehyde (F), boric acid (B), melamine (M), graphene oxide (GO) to be reactant, anhydrous sodium carbonate (C) is catalyst, deionized Water (DI) is the solvent, according to R / F=1:2, R / C=200:1, R / B=1:1.2, B / M=2.4:1, the dry weight of GO and the total dry weight of the reaction system The weight ratio is 0.01, and the total solid content of the reaction system is 20wt%. Mix and stir resorcinol, boric acid, and DI, condense and reflux, and react at 180°C for 60 minutes; mix and stir melamine and formaldehyde solution, and heat at 70°C React for 40 minutes; cool the two reacted solutions, mix and stir, add anhydrous sodium carbonate, and stir evenly; add 1.4wt% GO solution to the mixed solution after ultrasonication for 40 minutes, stir evenly, pour into the ampepin and seal , cross-linking reaction at 90°C for 60h to obtain an organogel; take out the gel and perform solvent exchange with acetone, and then dry at 90°C for 48h to obta...

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Abstract

A method for preparing boron-nitrogen co-doped carbon aerogel is disclosed. According to the method, graphene, phenols, aldehydes, a catalyst, boron, amine and a solvent are used as a reaction system,and through reaction crosslinking solidification, organogel is then obtained; the organogel is dried at normal pressure to obtain organic aerogel; and finally, the organic aerogel is carbonized in inert atmosphere to obtain graphene crosslinked boron-nitrogen co-doped carbon aerogel. By the preparation technology, a complex preparation technology of a conventional supercritical or freeze drying method is avoided, and a carbon aerogel material which meets different performance requirements can be prepared by regulating addition amount of B and N elements. In addition, the method of the invention has simple process, has low equipment requirements, is environmentally friendly, can be applied in the fields of energy storage materials, lithium ion batteries, super-capacitors, electro-adsorption materials and the like, and also can realize industrial production of carbon aerogel.

Description

technical field [0001] The invention relates to a method for preparing graphene cross-linked organic aerogels and carbon aerogels doped with boron and nitrogen two non-metallic elements by normal pressure drying. Background technique [0002] According to previous reports, carbon aerogels have a high specific surface area (400-1100m 2 g -1 ), higher conductivity (25-100Scm -1 ), lower density (<0.1gmL -1 ), and higher porosity, the pore diameter is dominated by mesoporous carbon, which facilitates the transport and storage of ions, reduces the overlap of the electric double layer, and avoids the formation of an excessively thick electric double layer. Its excellent performance makes it There are multiple uses; one of the main problems in the practical application of carbon aerogels is that the cost is relatively high and the preparation process is complicated, which is related to the use of freeze-drying or supercritical drying in the synthesis process. The cycle is l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15B82Y40/00
CPCB82Y40/00C01P2002/80C01P2002/85C01P2004/03C01P2006/12C01P2006/14C01P2006/16
Inventor 孟庆函曹兵王爽爽
Owner BEIJING UNIV OF CHEM TECH
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