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Graphene-carbon nanotube composite material, and preparation method and application thereof

A technology of carbon nanotubes and composite materials, which is applied in the field of graphene-carbon nanotube composite materials and its preparation, can solve the problems of low power density and achieve the effects of high power density, cheap and easy-to-obtain raw materials, and simple preparation methods

Inactive Publication Date: 2014-05-07
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to overcome the problem that the traditional graphene-carbon nanotube electrode material is applied to the electrochemical capacitor of ionic electrolyte with low power density, and provide a kind of graphene-carbon nanotube composite material and its preparation method

Method used

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  • Graphene-carbon nanotube composite material, and preparation method and application thereof
  • Graphene-carbon nanotube composite material, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0031] A preparation method of graphene-carbon nanotube composite material, comprising the following steps:

[0032] (1) Weigh 8.3g of graphite oxide and 4.15g of carbon nanotubes into 12.45L of deionized water, and ultrasonicate for 1 hour to obtain a graphene oxide-carbon nanotube dispersion with a mass fraction of 0.1%;

[0033] (2) Add 8.3L of 50% nitric acid solution while stirring, and ultrasonically treat at 25°C for 2 hours to obtain a suspension of graphene oxide-carbon nanotubes-nitric acid; at this time, nitric acid is bound to graphene oxide-carbon on nanotubes, and endow some carbon atoms with oxygen-containing functional groups;

[0034] (3) Filter the suspension in step (2), put the filtered filter cake in a vacuum drying oven, and dry at 60°C for 48 hours to obtain a solid powder, and then put the solid powder into a muffle furnace , calcined at a high temperature of 800°C for 5 hours, after cooling, pour deionized water into the powder for soaking and washing...

Embodiment 2

[0036] A preparation method of graphene-carbon nanotube composite material, comprising the following steps:

[0037] (1) Weigh 16.5g of graphite oxide and 0.1g of carbon nanotubes into 33.2L of deionized water, and ultrasonicate for 5 hours to obtain a graphene oxide-carbon nanotube dispersion with a mass fraction of 0.05%;

[0038] (2) Add 165L of 70% nitric acid solution while stirring, and ultrasonicate for 1 hour at 20°C to obtain a graphene oxide-carbon nanotube-nitric acid suspension; at this time, nitric acid is bound to graphene oxide-carbon nano On the tube, and endow some carbon atoms with oxygen-containing functional groups;

[0039] (3) Filter the suspension in step (2), put the filtered filter cake in an oven, and dry at 80°C for 24 hours to obtain a solid powder, and then put the solid powder into a graphite furnace to heat at 1200 ℃ high temperature heat treatment for 1 hour, after cooling, pour deionized water into the powder for soaking and rinsing, filter th...

Embodiment 3

[0041] A preparation method of graphene-carbon nanotube composite material, comprising the following steps:

[0042] (1) Weigh 13.3g of graphite oxide and 2g of carbon nanotubes into 3L of distilled water, and ultrasonicate for 2 hours to obtain a graphene oxide-carbon nanotube dispersion with a mass fraction of 0.5%;

[0043] (2) Add 199.5L of 65% nitric acid solution while stirring, and ultrasonically treat at 30°C for 1.5 hours to obtain a suspension of graphene oxide-carbon nanotubes-nitric acid; at this time, nitric acid is bound to graphene oxide-carbon on nanotubes, and endow some carbon atoms with oxygen-containing functional groups;

[0044] (3) Filter the suspension in step (2), put the filtered filter cake in an oven, and dry at 70°C for 36 hours to obtain a solid powder, and then put the solid powder into a muffle furnace to Heat treatment at 1000°C for 3 hours. After cooling, pour distilled water into the powder for soaking and rinsing. Filter the filter residue ...

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Abstract

The invention discloses a preparation method of a graphene-carbon nanotube composite material. The method comprises a first step in which graphite oxide and carbon nanotubes, by mass ratio of 1 to 0.005 to 0.5, are mixed and then put into water, and a dispersion is obtained after ultrasonic processing, a second step in which nitric acid is added and ultrasonic processing is carried out for 0.5 to 2 hours, and a third step in which a filter cake is filtered and dried, the obtained solid powder is put into a high-temperature furnace, heating processing under the temperature of 800 to 1200 DEG C is carried out for 1 to 5 hours, and the graphene-carbon nanotube composite material is obtained after cooling, washing, filtering and drying. The invention also discloses a graphene-carbon nanotube composite material prepared by the above preparation method and an electrochemical capacitor with the graphene-carbon nanotube composite material as an electrode material, the problem that the power density is low as a graphene-carbon nanotube electrode material is applied to the electrochemical capacitor of an ionic electrolyte is overcome, and the application range is expanded.

Description

technical field [0001] The invention relates to the field of graphene material synthesis, in particular to a graphene-carbon nanotube composite material and its preparation method and application. Background technique [0002] Graphene is a two-dimensional sheet with carbon atoms arranged in a hexagonal ring. It was first discovered in 2004 by Andre K. Geim of the University of Manchester in the United Kingdom. Graphene has high specific surface area, excellent electrical conductivity, and excellent thermal conductivity. Graphene obtained by graphite oxide reduction method has high cost performance and good stability, so it is an ideal electrode material. [0003] Carbon nanotubes are tubular objects formed by winding a single layer of carbon atoms around a coaxial layer or by nesting layers of a single layer of graphite cylinders along a coaxial layer. Carbon nanotubes are light in weight, high in strength, good in flexibility, have good electrical conductivity and heat tr...

Claims

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Application Information

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IPC IPC(8): H01G9/042C01B31/02C01B31/04C01B32/168C01B32/174C01B32/184
CPCY02E60/13
Inventor 周明杰钟玲珑王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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