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Graphene oxide aerogel, reduced graphene oxide aerogel as well as preparation methods and applications of graphene oxide aerogel and reduced graphene oxide aerogel

A graphene airgel and graphene technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of long preparation period, cumbersome process, and complicated process

Active Publication Date: 2018-12-28
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, although graphene airgel can also be prepared by normal pressure drying method, which can save the preparation cost to a certain extent, this method also needs to obtain graphene oxide hydrogel first, then freeze treatment, post-reduction, and drying and other steps to prepare airgel, the process is relatively cumbersome
In summary, all the existing graphene airgel preparation processes are relatively complicated, the preparation cycle is long (at least 12 hours), and the energy consumption is large, making it difficult to carry out large-scale production

Method used

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  • Graphene oxide aerogel, reduced graphene oxide aerogel as well as preparation methods and applications of graphene oxide aerogel and reduced graphene oxide aerogel
  • Graphene oxide aerogel, reduced graphene oxide aerogel as well as preparation methods and applications of graphene oxide aerogel and reduced graphene oxide aerogel
  • Graphene oxide aerogel, reduced graphene oxide aerogel as well as preparation methods and applications of graphene oxide aerogel and reduced graphene oxide aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] (1) prepare graphene oxide:

[0077] Prepare graphene oxide by improving the Hummers method: Pour 2g of natural graphite, 120mL of concentrated sulfuric acid and 6g of potassium permanganate into a 250mL three-neck flask, place in an ice-water bath, and stir for 2h below 4°C; raise the temperature of the system to 50°C ℃, heat preservation reaction for 6 hours; after the reaction, add 240mL distilled water and 2-5mL hydrogen peroxide, continue to stir for 30min, then perform centrifugal washing to remove excess acid and impurities to obtain a graphene oxide suspension, and place it in a 4℃ refrigerator for later use , the carbon to oxygen ratio of graphene oxide is 0.96.

[0078] (2) Preparation of dual-electricity chitin nanofibers:

[0079] First, mix 10g of chitin powder with 200mL of 35% sodium hydroxide, stir and heat at 90°C for 1 hour, wash and remove the sodium hydroxide with ethanol, and dry to obtain deacetylated chitin powder. Utilize the titration method t...

Embodiment 2

[0087] (1) prepare graphene oxide: with embodiment 1;

[0088] (2) Preparation of dual-electricity chitin nanofibers: same as Example 1;

[0089] (3) Preparation of a suspension of graphene oxide-chitin nanofiber hybrid particles: same as Example 1;

[0090] (4) prepare graphene oxide airgel: with embodiment 1;

[0091] (5) Preparation of reduced graphene oxide airgel:

[0092] The graphene oxide airgel obtained in step (4) was thermally reduced at 800° C. for 1 h to obtain a reduced graphene oxide airgel with a density of 2.193 mg / cm 3 .

[0093] Thermal reduction treatment can reduce the defects of graphene oxide airgel: there are a large number of oxygen-containing groups such as epoxy groups, carboxyl groups, hydroxyl groups, etc. on the edge and surface of graphene oxide. During the thermal reduction step, these oxygen-containing groups will The removal begins to occur, so that the graphene oxide sp 2 The structural reconstruction improves the properties of the reduc...

Embodiment 3

[0095] Same as Example 1, the difference is that the mass ratio of graphene oxide to double-electric chitin nanofibers is changed to 99:1.

[0096] The obtained graphene oxide airgel has a density of 6.42 mg / cm 3 .

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Abstract

An embodiment of the invention relates to the technical field of functional materials and particularly relates to graphene oxide aerogel, reduced graphene oxide aerogel as well as preparation methodsand applications of the graphene oxide aerogel and the reduced graphene oxide aerogel. The graphene oxide aerogel adopts a 3D network structure and comprises graphene oxide sheet layers, a gap surrounded by the graphene oxide sheet layers and double electrical chitin nanofiber located between the graphene oxide sheet layers or adsorbed on the surfaces of the graphene oxide sheet layers, and the obtained graphene oxide aerogel has anisotropy and higher compression resilience. On the basis of the graphene oxide aerogel, the reduced graphene oxide aerogel is obtained through further reduction, and the performance of the reduced graphene oxide aerogel is further optimized.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a graphene oxide airgel, a reduced graphene oxide airgel and a preparation method and application thereof. Background technique [0002] Graphene is made of sp 2 The two-dimensional layered nanocarbon material composed of carbon atoms has attracted the attention of many researchers since it was successfully prepared for the first time in 2004, and has a wide range of applications in batteries, supercapacitors, ultrafiltration and other aspects. [0003] Aerogel is called "solid smoke", and it is the solid material with the lowest density known in the world. It is in the form of a porous foam and has a high specific surface area. It is these characteristics that make aerogel, a three-dimensional material, unique. Excellent properties, such as super high adsorption capacity, excellent heat insulation capacity, etc. [0004] Graphene airgel can combine the...

Claims

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Application Information

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IPC IPC(8): C08J9/10C08J9/06C08J9/36C08J5/18C01B32/198C08L5/08C08K7/00C08K3/04
CPCC01B32/198C08J5/18C08J9/065C08J9/104C08J9/36C08J2305/08C08J2203/04C08K7/00C08K3/042
Inventor 张建明庞凯段咏欣刘晓婷
Owner QINGDAO UNIV OF SCI & TECH
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