Graphene quantum dot-graphene composite material as well as preparation method and application thereof

A technology of graphene quantum dots and composite materials, applied in the field of inorganic nanomaterials, can solve the problems of complex synthesis methods and doping, and achieve the effects of good electrochemical performance, huge application potential and industrial value

Inactive Publication Date: 2014-12-10
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] As mentioned above, although a variety of methods for modifying graphene are disclosed in the prior art, there are certain shortcomings in these prior art, such as the synthesis met

Method used

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  • Graphene quantum dot-graphene composite material as well as preparation method and application thereof
  • Graphene quantum dot-graphene composite material as well as preparation method and application thereof
  • Graphene quantum dot-graphene composite material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0074] (1) Hexabromobenzene, sodium metal and toluene were stirred, sealed and reacted for 20 hours at 220°C and 2MPa in a high-pressure reactor with a polytetrafluoroethylene liner, wherein hexabromobenzene and sodium metal The mass ratio of hexabromobenzene and toluene is 1:2, and the mass volume ratio of hexabromobenzene and toluene is 1:100g / ml;

[0075] (2) After the reaction, the pressure was released to normal pressure, and naturally cooled to room temperature, and centrifuged to obtain a solid, which was washed with water and absolute ethanol in sequence, and vacuum-dried at 80° C. for 10 hours to obtain a dry sample;

[0076] (3) Under the protection of argon, the dried sample was treated in a tube furnace at a high temperature of 1000° C. for 2 hours to obtain the graphene quantum dot-graphene composite material of the present invention, named G1.

Embodiment 2

[0078] (1) Hexabromobenzene, sodium metal and toluene are stirred, sealed and reacted for 24 hours at 180°C and 1MPa in a high-pressure reactor with a polytetrafluoroethylene liner, wherein hexabromobenzene and sodium metal The mass ratio of hexabromobenzene and toluene is 1:1, and the mass volume ratio of hexabromobenzene and toluene is 1:50g / ml;

[0079](2) After the reaction, the pressure was released to normal pressure, and naturally cooled to room temperature, and centrifuged to obtain a solid, which was washed with water and absolute ethanol in sequence, and vacuum-dried at 60° C. for 12 hours to obtain a dry sample;

[0080] (3) Under the protection of argon, the dried sample was treated in a tube furnace at a high temperature of 1000° C. for 1 hour to obtain the graphene quantum dot-graphene composite material of the present invention, named G2.

Embodiment 3

[0082] (1) Hexabromobenzene, sodium metal and toluene were stirred, sealed and reacted for 16 hours at 240°C and 4MPa in a high-pressure reactor with a polytetrafluoroethylene liner, wherein hexabromobenzene and sodium metal The mass ratio of hexabromobenzene and toluene is 1:3, and the mass volume ratio of hexabromobenzene and toluene is 1:150g / ml;

[0083] (2) After the reaction, the pressure was released to normal pressure, and naturally cooled to room temperature, and centrifuged to obtain a solid, which was washed with water and absolute ethanol in sequence, and vacuum-dried at 100° C. for 8 hours to obtain a dry sample;

[0084] (3) Under the protection of argon, the dried sample was treated in a tube furnace at a high temperature of 1000° C. for 3 hours to obtain the graphene quantum dot-graphene composite material of the present invention, named G3.

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Abstract

The invention relates to a graphene quantum dot-graphene composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, enabling full-halogenated benzene, alkali metal elementary substances and substituted aromatic compounds to be stirred and sealed in a reactor, and performing the reaction on the mixture under the reaction pressure higher than the barometric pressure; secondly, after ending the reaction, relieving the pressure to normal pressure, naturally cooling to room temperature, and performing centrifugal separation to obtain a solid; performing washing and vacuum drying on the solid to obtain a dried sample; thirdly, performing high-temperature treatment on the dried sample under the protection of inert gases to obtain the graphene quantum dot-graphene composite material. An oxygen reduction electrode made of the graphene quantum dot-graphene composite material has excellent electrochemical performance, so that the graphene quantum dot-graphene composite material can be applied to the field of fuel cells.

Description

technical field [0001] The invention provides a composite material, a preparation method and its use, more specifically, a graphene quantum dot-graphene composite material and its preparation method and use, belonging to the technical field of inorganic nanomaterials. Background technique [0002] Among all fuel cells, alkaline fuel cells are considered to be one of the important power supply devices to solve future energy problems due to their high energy, high power, and non-polluting characteristics. [0003] In the existing alkaline fuel cells, the catalysts, especially the cathode oxygen reduction catalysts, are mainly noble metal platinum catalysts, including platinum and platinum alloy catalysts. However, due to the high price of platinum and the lack of resources, the cost of the catalyst is very high; at the same time, the stability of platinum and its support is poor in the oxidizing environment of the cathode. Based on the above reasons, the research on non-noble...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/90B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/90Y02E60/50
Inventor 金辉乐王舜黄慧慧刘爱丽何宇华
Owner WENZHOU UNIVERSITY
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