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Graphene and preparation method and application thereof

A graphene and graphite electrode technology, applied in structural parts, electrolytic components, electrical components, etc., can solve the problems of poor environment, low output, toxic and pollution, etc.

Inactive Publication Date: 2019-02-12
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the preparation method of graphene is mainly graphite oxide reduction method, which will cause the destruction of graphene structure, and the use of toxic and polluting chemical reagents will have adverse effects on the environment and is not conducive to environmental protection
In addition, there is also a method of using pyrolysis carbon source to prepare graphene. This method has low yield and high cost, and is not suitable for mass production.
There is also a method for preparing graphene by electrochemical method, but the functionalization and functionalization degree of the obtained graphene are not high.

Method used

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preparation example Construction

[0027] The invention provides a kind of preparation method of graphene, comprises the steps:

[0028] Use ionic liquid as electrolyte, insert graphite electrode as anode and metal electrode or non-metal electrode as cathode;

[0029] Apply a voltage of 1V-10V or a density of 1mA / cm between the cathode and anode 2 -100mA / cm 2 The electric current, electrochemical reaction preset time, get the reaction product;

[0030] The reaction product is post-treated to obtain thin-layer graphene.

[0031] The ionic liquids are 1-ethyl-3-methylimidazolium bromide, 1-ethyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium iodide, 1-ethyl-2 , 3-dimethylimidazolium trifluoromethanesulfonate, 1,2-diethyl-3-methylimidazolium trifluoromethanesulfonate, 1,2-dimethyl-3-ethylimidazolium bromide, One or more of 1,2-dimethyl-3-ethylimidazolium chloride and 1,2-dimethyl-3-ethylimidazolium tetrafluoroborate. A single ionic liquid can be selected, or multiple ionic liquids can be selected t...

Embodiment 1

[0044] The invention provides a method for preparing graphene, comprising the following steps: using 1-ethyl-3-methylimidazolium bromide as an ionic liquid, and using 200mm*200mm graphite paper (99% carbon content) to make an electrode As the anode, a 2mm*2mm platinum sheet is used as the cathode, the above-mentioned anode and cathode are inserted into the above-mentioned ionic liquid with a gap of 70mm, and a voltage of 5V is applied between the anode and the cathode. The role of graphite paper in the electrolysis of ions and electric field After 1.5 hours of reaction, the reaction was completed, and the reaction product in the liquid was collected, washed with water, filtered, then ultrasonically treated, and finally dried at 55°C to obtain Bromine-containing thin-layer graphene powder.

[0045] The graphene powder that above-mentioned embodiment obtains is placed in scanning electron microscope and carries out SEM characterization, and the graphene topography figure refers ...

Embodiment 2

[0047]The invention provides a method for preparing graphene, comprising the following steps: using 1-ethyl-3-methylimidazolium chloride salt as an ionic liquid, and using an electrode made of a high-purity graphite strip (with a carbon content of 99%) as an anode , with a 2mm*2mm platinum sheet as the cathode, the above-mentioned anode and cathode are inserted into the above-mentioned ionic liquid with a gap of 70mm, and a voltage of 5V is applied between the anode and the cathode, and the graphite paper is under the action of electrolytic ions and an electric field, The lamellar structure is opened and gradually decomposed into thin-layer graphene. After 2 hours of reaction, the reaction is completed. The reaction product in the liquid is collected, washed with water, filtered, then ultrasonically treated, and finally dried at 55°C to obtain chlorine-containing Thin layer graphene powder.

[0048] The graphene powder obtained in the above examples was placed in a scanning el...

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Abstract

The invention discloses graphene and a preparation method and an application thereof. The preparation method of the graphene comprises the following steps: taking an ionic liquid as an electrolyte andinserting a graphite electrode as an anode and a metal electrode or a non-metal electrode as a cathode; applying a current, the voltage of which is 0.5-10 V and the density of which is 1-100 mA / cm<2>, between the anode and the cathode, for an electrochemical reaction for a preset time to obtain a reaction product; and post-processing the reaction product to obtain thin graphene; or taking an ionic liquid as an electrolyte and inserting a graphite electrode as an anode and a metal electrode or a non-metal electrode as a cathode; applying a voltage or a current between the anode and the cathodefor an electrochemical reaction for a preset time to obtain a reaction product; and post-processing the reaction product to obtain thin graphene. The graphene is made by the method and is applied toa battery. According to the preparation method of the graphene, the graphene prepared by the method is high in functionalization degree and relatively more in function.

Description

technical field [0001] The invention relates to the technical field of graphene materials, in particular to graphene and its preparation method and application. Background technique [0002] Graphene is a two-dimensional carbon atom crystal discovered by Andre K. Geim of the University of Manchester in 2004, and won the Nobel Prize in Physics in 2010, which once again sparked an upsurge in carbon material research. Due to its unique structure and photoelectric properties, it has become a research hotspot in the fields of carbon materials, nanotechnology, condensed matter physics and functional materials, attracting many scientific and technological workers. [0003] Graphene has excellent physical and chemical properties, high light transmittance and electrical conductivity, high specific surface area, high strength and flexibility, etc. It is expected to be used in high-performance nanoelectronic devices, optoelectronic devices, gas sensors, composite Materials, field emis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00H01M4/583H01M4/62
CPCC25B1/00H01M4/583H01M4/625Y02E60/10
Inventor 李瑛苏陈良范滇元田冰冰
Owner SHENZHEN UNIV