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A preparation method of graphene composite carbon airgel with high specific surface area and high conductivity based on chemical crosslinking

A graphene composite, high specific surface area technology, applied in chemical instruments and methods, carbon preparation/purification, nanotechnology for materials and surface science, etc. problems such as poor performance, to achieve the effect of inhibiting collapse and shrinkage, simplifying the process, and excellent electrical

Inactive Publication Date: 2019-01-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the manufacturing process is complicated, requiring two high-temperature treatments, and the operation risk is high; in addition, due to the low-density organic RF aerogel (-3 ) has a slender skeleton structure and poor mechanical properties. Severe shrinkage and collapse will occur during high-temperature carbonization, resulting in a substantial increase in the density of the airgel after carbonization. Therefore, it is difficult to obtain aerogels with low density (-3 ) and high specific surface area (>2000 m 2 g -1 ) characteristics of carbon aerogels

Method used

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  • A preparation method of graphene composite carbon airgel with high specific surface area and high conductivity based on chemical crosslinking
  • A preparation method of graphene composite carbon airgel with high specific surface area and high conductivity based on chemical crosslinking
  • A preparation method of graphene composite carbon airgel with high specific surface area and high conductivity based on chemical crosslinking

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Effect test

Embodiment 1

[0025] Take 4.32mL of the ultrasonically dispersed 5mg·mL -1 Graphene oxide aqueous solution, mix resorcinol and formaldehyde at a molar ratio of 1:2, then add 1.02mL of 0.05mol·mL -1 Sodium carbonate aqueous solution (the molar ratio of resorcinol to sodium carbonate is 50:1) was used as the catalyst, and the volume was adjusted to 20 mL with deionized water, and stirred at room temperature until completely dissolved. Then, nitric acid was slowly added dropwise to adjust the pH value of the mixed solution to 5.4-5.6, and the stirring was continued for 2 h to obtain a precursor solution. The obtained precursor solution was packaged in a glass bottle, and placed in a 85°C incubator for sol-gel reaction for 5-7 days to obtain a graphene oxide / RF organic wet gel, which was put into ethanol, acetic acid (Volume ratio 7:3) in the solution, pickled and aged in a water bath at 40-45°C for 3 days, then replaced the solvent with absolute ethanol for 6 times, and finally subjected the ...

Embodiment 2

[0028] Take 8.11mL of the ultrasonically dispersed 8mg·mL -1 Graphene oxide aqueous solution, mix resorcinol and formaldehyde at a molar ratio of 1:2, then add 1.02mL of 0.05mol·mL -1Sodium carbonate aqueous solution (the molar ratio of resorcinol to sodium carbonate is 50:1) was used as the catalyst, and the volume was adjusted to 20 mL with deionized water, and stirred at room temperature until completely dissolved. Then, nitric acid was slowly added dropwise to adjust the pH value of the mixed solution to 5.4-5.6, and the stirring was continued for 2 h to obtain a precursor solution. The obtained precursor solution was packaged in a glass bottle, and placed in a 85°C incubator for sol-gel reaction for 5-7 days to obtain a graphene oxide / RF organic wet gel, which was put into ethanol, acetic acid (Volume ratio 7:3) in the solution, pickled and aged in a water bath at 40-45°C for 3 days, then replaced the solvent with absolute ethanol for 6 times, and finally subjected the w...

Embodiment 3

[0031] Take 10.82mL of the ultrasonically dispersed 10mg·mL -1 Graphene oxide aqueous solution, mix resorcinol and formaldehyde at a molar ratio of 1:2, then add 1.02mL of 0.05mol·mL -1 Sodium carbonate aqueous solution (the molar ratio of resorcinol to sodium carbonate is 50:1) was used as the catalyst, and the volume was adjusted to 20 mL with deionized water, and stirred at room temperature until completely dissolved. Then, nitric acid was slowly added dropwise to adjust the pH value of the mixed solution to 5.4-5.6, and the stirring was continued for 2 h to obtain a precursor solution. The obtained precursor solution was packaged in a glass bottle, and placed in a 85°C incubator for sol-gel reaction for 5-7 days to obtain a graphene oxide / RF organic wet gel, which was put into ethanol, acetic acid (Volume ratio 7:3) in the solution, pickled and aged in a water bath at 40-45°C for 3 days, then replaced the solvent with absolute ethanol for 6 times, and finally subjected th...

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Abstract

The invention relates to a preparation method of high-specific-surface-area high-electric-conductivity graphene compound carbon aerogel based on chemical crosslinking. Graphene oxide is added to a precursor solution of resorcinol and formaldehyde to adjust the pH value, chemical crosslinking graphene oxide / RF organic wet gel is obtained through sol-gel reaction, graphene oxide / RF organic aerogel is obtained through acid pickling, solvent replacing and carbon dioxide supercritical drying, and the graphene compound carbon aerogel is prepared through high-temperature pyrolysis reduction treatment. By adding dispersion liquid of graphene oxide to the precursor solution of resorcinol and formaldehyde to adjust the pH value, the uniformity and crosslinking property of doped graphene are ensured, the framework strength of a three-dimensional nanometer network is remarkably enhanced, and the severe contraction collapse phenomenon happening in the carbonizing process of low-density carbon aerogel is greatly improved. The prepared graphene compound carbon aerogel has extremely low apparent density, superhigh specific surface area and excellent electric conductivity and heat conductivity and can be more easily processed into molding products of various forms in the application process.

Description

technical field [0001] The invention belongs to the technical field of nanoporous-carbon aerogels, in particular to a method for preparing graphene composite carbon aerogels with high specific surface area conductivity based on chemical crosslinking. Background technique [0002] Carbon airgel is a new type of lightweight nanoporous amorphous carbon material, which has attracted extensive attention and applications due to its advantages such as high specific surface area, high porosity, high electrical conductivity, and adjustable microstructure. High porosity, high specific surface area and multi-level pore structure make carbon aerogels exhibit strong adsorption capacity, and have broad application prospects in catalyst supports, adsorbents, etc.; high electrical conductivity, adjustable microstructure, high specific Advantages such as surface area can serve as ideal click materials for energy storage devices, especially Li-ion batteries or supercapacitors. These applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C01B32/184C01B32/198C04B30/00B01J20/20B01J20/28H01G11/36H01G11/26H01M4/583B82Y30/00
CPCB01J20/20B01J20/28047B82Y30/00C01P2002/80C01P2002/82C01P2004/03C01P2006/10C01P2006/12C01P2006/32C01P2006/40C04B30/00H01G11/26H01G11/36H01M4/583Y02E60/10
Inventor 孙巍杜艾刘银丹周斌高国华吴广明倪星元张志华沈军
Owner TONGJI UNIV
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