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Partially reduced graphene oxide composite material and preparation method thereof

A composite material and graphene technology, which is applied in the preparation/purification of carbon, chemical instruments and methods, carbon compounds, etc., can solve the problems of limited conductive effect, reduction of material weight specific capacitance, and scattered dispersion of CB particles.

Active Publication Date: 2017-08-25
深圳石墨烯创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, these CB particles are added during the electrode preparation process, scattered scattered between the rGO sheets, the conductive effect is limited, and too much addition of CB will lead to a serious decrease in the weight specific capacitance of the material
At present, CB particles can also be introduced between rGO sheets by in situ synthesis, but the preparation process is complicated, and the problem of scattered dispersion of CB particles in rGO sheets has not been solved.

Method used

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  • Partially reduced graphene oxide composite material and preparation method thereof
  • Partially reduced graphene oxide composite material and preparation method thereof
  • Partially reduced graphene oxide composite material and preparation method thereof

Examples

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preparation example Construction

[0019] see figure 1 , the preparation method of the partially reduced graphene oxide composite material provided by an embodiment of the present invention, the method comprises the following steps:

[0020] S1: Provide graphite oxide (graphene oxide, GO) powder, add it to deionized water and disperse to obtain dispersion A;

[0021] S2: adding a surfactant to deionized water, and then adding carbon black (carbon black, CB) particles to disperse to obtain a dispersion B;

[0022] S3: Mix the dispersion liquids A and B, and obtain the dispersion liquid of GO-CB after dispersion;

[0023] S4: subjecting the dispersion liquid obtained in step S3 to a hydrothermal reaction for a period of time under a certain temperature condition, suction filtration and drying to obtain a multi-dimensional partially reduced graphene oxide composite material.

[0024] In step S1, after adding graphite oxide into deionized water, dispersion liquid A is obtained by ultrasonic dispersion. In this e...

Embodiment 1

[0032] S1: Provide 110 mg of graphite monoxide powder, add it into 100 ml of deionized water, and disperse for 2 hours to obtain dispersion A;

[0033] S2: Add 220 mg of surfactant CTAB to 60 ml of deionized water, and then add 13.75 mg of carbon black powder to disperse for 1 hour to obtain dispersion B;

[0034] S3: Mix the dispersions A and B, and disperse for 2 hours to obtain the dispersion of GO-CB;

[0035] S4: The dispersion liquid obtained in step S3 was subjected to a hydrothermal reaction at 170° C. for 28 hours, then suction-filtered and dried to obtain a multi-dimensional partially reduced graphene oxide composite material.

[0036] S5: heat-treating the partially reduced graphene oxide composite material obtained in step S4 at 400°C.

[0037] TEM sample implementation process: ultrasonically disperse the partially reduced graphene oxide composite material prepared in Example 1 in alcohol, drop it on a copper grid, and perform TEM characterization after drying. ...

Embodiment 2

[0043] S1: Provide 100mg of graphite monoxide powder;

[0044] S2: In an argon atmosphere, graphene was prepared by reduction by thermal expansion at 300°C.

[0045] S3: Ultrasonic dispersion of carbon black and graphene to prepare a mechanical hybrid material of carbon black and graphene

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Abstract

A partially reduced graphene oxide / string carbon black composite material, comprising partially reduced graphene oxide and carbon black, the carbon black is string-shaped and exists on the surface of the partially reduced graphene oxide sheet, the The mass percent of the oxygen content of the partially reduced graphene oxide is greater than 1 wt%. The partially reduced graphene oxide composite material has good capacitive properties, and the string graphene endows excellent electrical conductivity, which is an ideal electrode material for supercapacitors.

Description

technical field [0001] The invention relates to a supercapacitor, in particular to a partially reduced graphene oxide composite material used for supercapacitor electrodes and a preparation method thereof. Background technique [0002] Supercapacitor has the characteristics of short charging time, long service life, strong environmental adaptability, energy saving and no pollution to the environment. It is a new type of energy storage element between traditional electrostatic supercapacitors and electrochemical energy sources. Technology, electric vehicles, consumer electronics power supplies, etc. have important and broad application prospects, and thus have attracted widespread attention. As an important part of the supercapacitor, the performance of the electrode material directly has a huge impact on the electrochemical performance (capacitance, cycle life, etc.) of the supercapacitor material. It can be seen that it is of great significance to prepare a supercapacitor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/34H01G11/42C01B32/05C01B32/192
CPCY02E60/13
Inventor 杨全红李用苏方远李宝华康飞宇
Owner 深圳石墨烯创新中心有限公司