Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing three-dimensional carbon foam/graphene oxide-based composites by centrifugal separation

A composite material and graphene-based technology, applied in chemical instruments and methods, other chemical processes, electrochemical generators, etc., can solve the problem of rapid preparation and large-scale production of three-dimensional graphene or its composite materials, difficult three-dimensional Graphene-based composite materials and other issues, to achieve good flexibility, simple method, and time-saving effects

Inactive Publication Date: 2020-08-11
LIAONING TECHNICAL UNIVERSITY
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the existing preparation methods of three-dimensional graphene composite materials generally require harsh environments (CVD method) or long post-processing time (freeze-drying by impregnation method), and it is difficult to realize three-dimensional graphene or its composite materials. Rapid preparation and large-scale production, especially difficult to controllably prepare three-dimensional graphene-based composites with fixed graphene oxide content

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing three-dimensional carbon foam/graphene oxide-based composites by centrifugal separation
  • Method for preparing three-dimensional carbon foam/graphene oxide-based composites by centrifugal separation
  • Method for preparing three-dimensional carbon foam/graphene oxide-based composites by centrifugal separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The concentration of the graphene oxide dispersion used is 3.0mg / mL:

[0036]After cleaning the melamine-formaldehyde resin foam with distilled water and ethanol respectively, immerse it in absolute ethanol for ultrasonic treatment to wash off impurities, then take it out and air-dry it to remove absolute ethanol, and then raise the temperature at a rate of 5°C / min under an inert atmosphere Heat at 800°C, hold for 5 hours for thermal cracking, and cool down to room temperature with the furnace to obtain a conductive three-dimensional carbon foam skeleton; the appearance photos before and after thermal cracking are as follows figure 1 Shown; The SEM photo of the three-dimensional carbon foam skeleton is shown in figure 2 shown;

[0037] Immerse the three-dimensional carbon foam skeleton into the graphene oxide dispersion, soak for 20 minutes, and repeatedly squeeze the three-dimensional carbon foam skeleton to ensure saturated adsorption, and obtain carbon foam with ad...

Embodiment 2

[0040] Method is with embodiment 1, and difference is:

[0041] (1) The concentration of the graphene oxide dispersion is 2.0mg / mL;

[0042] (2) Heating up to 1000°C at a rate of 10°C / min, and keeping the temperature for 2 hours for cracking;

[0043] (3) soaking time 10min;

[0044] (4) The rotating speed of centrifuge is 2000rpm, and centrifugal time is 10min;

[0045] (5) The solid phase is dried at 80° C. for 30 minutes, and contains 9% graphene oxide by weight.

Embodiment 3

[0047] Method is with embodiment 1, and difference is:

[0048] (1) The concentration of graphene oxide dispersion is 6.0mg / mL;

[0049] (2) Heating up to 900°C at a speed of 8°C / min, and keeping the temperature for 3 hours for cracking;

[0050] (3) soaking time 3min;

[0051] (4) The rotating speed of centrifuge is 500rpm, and centrifugal time is 20min;

[0052] (5) The solid phase is dried at 70° C. for 45 minutes, and contains 16% graphene oxide by weight.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Disclosed is a method for preparing a three-dimensional carbon foam / graphene oxide-based composite material by centrifugal separation. The method comprises the following steps of (1) performing pretreatment on tripolycyanamide-formaldehyde resin foam and then performing thermal cracking in an inert atmosphere condition to prepare a three-dimensional carbon foam framework; (2) enabling the three-dimensional carbon foam framework to be immersed in a graphene oxide dispersion liquid or a graphene oxide-based composite material dispersion liquid, and performing repeated extrusion to obtain carbonfoam with adsorbed graphene oxide or the graphene oxide-based composite material; (3) putting the carbon foam into a centrifugal tube or a centrifugal bottle with a sieve-pore-structured partition plate, and starting a centrifugal machine to realize solid liquid separation under a centrifugal effect through the partition plate; and (4) performing drying on the solid phase after separation and removing water content. The method is simple and easy to implement, and capable of avoiding a severe preparation environment, saving much time, controlling and regulating the content of graphene oxide inthe composite material, and realizing large-scale production; and the product has high flexibility and conductivity.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional graphene-based composite materials, and in particular relates to a method for preparing three-dimensional carbon foam / graphene oxide-based composite materials by centrifugal separation. Background technique [0002] Graphene is a two-dimensional honeycomb structure formed by stacking a single layer of carbon atoms. It is the thinnest, best-conducting, and highest-mechanical two-dimensional nanomaterial discovered so far. The existing graphene or graphene oxide is mostly prepared by physical methods such as chemical vapor deposition (CVD) and chemical methods (Hummers). In order to meet the urgent needs of the new energy field, various porous and large specific surface area three-dimensional graphene or its composite materials have been prepared for high-performance supercapacitors, lithium-ion batteries, sodium-ion batteries and other fields. [0003] At present, the preparation methods...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525H01M10/054H01G11/86H01G11/32H01G11/24B01J20/20B01J20/30C02F1/28
CPCB01J20/20C02F1/281H01G11/24H01G11/32H01G11/86H01M4/364H01M4/483H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 洪晓东姜海艳陆玉刚李顺利
Owner LIAONING TECHNICAL UNIVERSITY