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Preparation method of graphene foams

A graphene foam and graphene technology, applied in the field of electrochemical energy storage devices, can solve problems such as large energy consumption and difficult mass production, and achieve the effects of easy operation and simple equipment requirements

Inactive Publication Date: 2015-01-21
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is generally carried out at a high temperature of >1000 °C, which consumes a lot of energy and is not easy to produce on a large scale.

Method used

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  • Preparation method of graphene foams
  • Preparation method of graphene foams
  • Preparation method of graphene foams

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Plasma treatment is carried out to nickel foam, and soaked in 6.0 mg / ml graphene oxide solution;

[0024] (2) In the ascorbic acid solution containing 10.0 mg / ml, the graphene oxide coated on the nickel foam is reduced, the reduction temperature is 60 ° C, and the time is 12 hours;

[0025] (3) Place the nickel foam coated with graphene in an aqueous solution containing 6 M hydrochloric acid, take it out after 6 hours, and wash it repeatedly with absolute ethanol and water to obtain a graphene foam.

Embodiment 2

[0027] (1) Plasma treatment is carried out to nickel foam, and soaked in 8.0 mg / ml graphene oxide solution;

[0028] (2) in hydroiodic acid, the graphene oxide coated on the nickel foam is reduced, and the time is 30 minutes;

[0029] (3) Place the nickel foam coated with graphene in an aqueous solution containing 0.5 M ferric nitrate at 80°C, take it out after 20 hours, and wash it repeatedly with absolute ethanol and water to obtain a graphene foam.

Embodiment 3

[0031] (1) Plasma treatment is carried out to nickel foam, and soaked in 10.0 mg / ml graphene oxide solution;

[0032] (2) The graphene oxide coated on the nickel foam is reduced in a hydrazine hydrate solution, the reduction temperature is 95° C., and the time is 1 hour;

[0033] (3) Place the nickel foam coated with graphene in an aqueous solution containing 3 M hydrochloric acid at 80°C, take it out after 6 hours, and wash it repeatedly with absolute ethanol and water to obtain a graphene foam.

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Abstract

The invention relates to a preparation method of graphene foams. The preparation method of the graphene foams comprises the steps: carrying out plasma technology treatment on foamed nickel, and soaking in a graphene oxide solution; reducing graphene oxide coating the foamed nickel in the solution; placing the foamed nickel coated with graphene in the solution, removing the nickel template through metal corrosion, and repeatedly washing with absolute ethyl alcohol and water, and thus obtaining the graphene foams. The material not only has extremely low density, extremely high porosity and high specific surface area, but also has excellent conductivity of graphene. Compared with the prior art, the preparation method has the advantages of simple process, low cost, easy industrial popularization, and convenient industrialized mass production.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage devices such as batteries and supercapacitors, in particular to a preparation method of graphene foam and its application in electrochemical energy storage devices. Background technique [0002] Graphene is a new type of carbon nanomaterial, which consists of a single layer of sp2 carbon atoms tightly packed into a two-dimensional honeycomb structure. Graphene has excellent electrical, thermal, optical and mechanical properties. At the same time, graphene's high theoretical specific surface area and excellent electrical conductivity determine its great potential as an electrode material in electrochemical energy storage devices. [0003] Cheng Huiming et al. (N. Li et al., Proc. Natl. Acad. Sci. 109(2012)17360) successfully prepared high-conductivity, flexible three-dimensional porous graphite foam by chemical vapor deposition (CVD)-metal template method Graphene, and use it as a cu...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 何丹农杨扬张春明王丹吴晓燕严鹏黄昭
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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