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A kind of all-carbon graphene airgel and preparation method thereof

A technology of carbon graphite and airgel, which is applied in the field of graphene, can solve the problems of poor electrical conductivity of graphene composite airgel, increasing the density of graphene airgel, and inability to become an electron transmission channel, etc.

Active Publication Date: 2021-08-20
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still several problems to be solved when polymers are introduced into the airgel structure as a crosslinking agent. Firstly, the introduction of a large amount of polymers will significantly increase the density of the obtained graphene airgel; secondly, due to the thermal instability of polymers , polymer cross-linked graphene airgel cannot be heat-treated at high temperature, so the obtained graphene composite airgel has poor electrical conductivity; in addition, as a cross-linking agent, polymers are generally non-conductive and cannot become effective electron transport channels. Further weakening the conductive properties of graphene aerogels

Method used

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  • A kind of all-carbon graphene airgel and preparation method thereof
  • A kind of all-carbon graphene airgel and preparation method thereof
  • A kind of all-carbon graphene airgel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Step 1. This method uses graphene oxide synthesized by a conventional chemical oxidation method as a precursor, and the graphene oxide is uniformly dispersed in water to obtain a concentration of 2 mg mL -1 200mL of graphene oxide dispersion;

[0040] Step 2: Add 5mL of concentrated ammonia water (25%-28%) to the graphene oxide dispersion in step 1, heat to 70°C for 30min, and use high-speed centrifugation to obtain the lower black viscous substrate; subsequently, the The lower black viscous substrate is dispersed in 200mL 0.01M hydrochloric acid and heated to reflux. After cooling down, use high-speed centrifugation and wash with water to obtain a concentration of 4mgmL -1 Aging graphene oxide dispersion liquid;

[0041] Step 3: Disperse polyvinyl alcohol in water, and prepare the same concentration as the aged graphene oxide dispersion to be 4mg mL -1 ;

[0042]Step 4: uniformly mix the aged graphene oxide dispersion described in step 2 with the polyvinyl alcohol s...

Embodiment 2

[0047] Compared with Example 1, the difference between this example and Example 1 is that the ammonia water in step 2 is changed to 0.12g sodium hydroxide solid, and the rest are the same, that is, ultra-light, super-elastic, and highly conductive full-carbon graphene gas condensation is obtained. glue.

[0048] The resulting all-carbon graphene airgel has a density of 1.75 mg / cm 3 The electrical conductivity is 16.8S / m; it shows good elasticity, and it can rebound to the original height immediately (within 1 second) after hundreds of compression cycles and the external force is removed.

Embodiment 3

[0050] Compared with Example 1, the present embodiment is only different in that the aged graphene oxide concentration and polyvinyl alcohol aqueous solution concentration in step 2 are changed to 6mg mL -1 , the rest are the same, that is, ultra-light, super-elastic, and highly conductive all-carbon graphene airgel is obtained. The density of the all-carbon aerogel obtained by this method is slightly increased, and the elasticity, Young's modulus, and electrical conductivity are all the same. increased.

[0051] The resulting all-carbon graphene airgel has a density of 2.45 mg / cm 3 ; The electrical conductivity is 25.6S / m; it also exhibits good resilience performance, and can immediately (within 1 second) return to its original height after hundreds of compression cycles.

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Abstract

The invention discloses an all-carbon graphene aerogel and a preparation method thereof. Specifically, the pH of the graphene oxide aqueous solution is adjusted to alkaline and heated to reflux, and a black viscous substrate is obtained by separation; the black viscous substrate is acidified and heated to reflux, and centrifuged and washed to obtain aged graphene oxide after cooling. Dispersion; then evenly mixed with the polymer aqueous solution, added glutaraldehyde, heated and cross-linked, placed in a mold, directional frozen in liquid nitrogen, thawed at room temperature, heated and reduced by adding a chemical reducing agent, washed with water and dried , and heat treatment at high temperature under the protection of an inert atmosphere to finally obtain an all-carbon graphene aerogel. In the structure of the all-carbon graphene aerogel, the inter-layer connection is good, the internal pores are abundant, and it can withstand thousands of compression-rebound cycle tests, and it exhibits excellent characteristics such as ultra-light, ultra-strong elasticity and high conductivity. .

Description

technical field [0001] The invention relates to the field of graphene, in particular to an all-carbon graphene airgel and a preparation method thereof. Background technique [0002] Graphene airgel is a three-dimensional network structure obtained by cross-linking graphene nanosheets through π-π interactions and hydrophobic interactions. This structure not only maintains the excellent properties of graphene nanosheets such as high electrical conductivity and high thermal conductivity, but also has new advantages such as ultra-low density and rich internal pores, and has shown good performance in the fields of batteries, supercapacitors, and environmental pollution restoration. application prospects. [0003] At present, graphene oxide prepared by chemical oxidation method is an important raw material for large-scale and cheap preparation of graphene airgel. However, due to the weak cross-linking effect between graphene oxide sheets, the structure of aerogels prepared with g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C01B32/194
CPCC01B2204/20C01B2204/22C01B2204/26C01B32/184C01B32/194
Inventor 陈笑笑付明来
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI