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Doped graphene material and preparation method and application thereof

A nitrogen-doped graphene and graphite material technology, applied in the field of materials, can solve the problems of graphene sheet thickness, high oxygen content, and low graphene yield, and achieve thin graphene sheets, low oxygen content, and yield high rate effect

Inactive Publication Date: 2019-04-12
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing electrochemical method uses graphite as a raw material, and prepares graphene through one-step electrochemical exfoliation. There are problems such as thick graphene sheets, low graphene yield, and high oxygen content, which cannot well meet the needs of practical applications.

Method used

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  • Doped graphene material and preparation method and application thereof
  • Doped graphene material and preparation method and application thereof
  • Doped graphene material and preparation method and application thereof

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preparation example Construction

[0029] see figure 1 and figure 2 The embodiment of the present invention provides a method for preparing a doped graphene material, including: step 101, electrochemically intercalating the graphite material in an acid solution, and reacting to obtain a graphite intercalation product. Step 102, electrochemically doping the graphite intercalation in fluorine- and / or nitrogen-containing dopants to obtain a doped graphene material.

[0030] In the method provided by the embodiments of the present invention, when preparing a doped graphene material, electrochemical intercalation is first performed to obtain a graphite intercalation, and then doped by an electrochemical reaction to obtain a doped graphene material, which has graphite The graphene layer is thin, the oxygen content is low, the conductivity is high, the water dispersibility is good, and the yield of the obtained doped graphene is high, and the preparation method is simple, and it is suitable for large-scale productio...

Embodiment 1

[0052] A preparation method of doped graphene material, comprising the steps of:

[0053] Step 201: Press 500 mg of graphite powder into graphite paper, connect the graphite paper and the platinum sheet to the positive and negative electrodes of the power supply through wires, and immerse the graphite paper and the platinum sheet in concentrated sulfuric acid. Start the power supply, control the power supply voltage to 2V, and perform electrochemical intercalation with a reaction time of 30 minutes to obtain intercalated graphite. Due to the insertion of a large number of anions and co-intercalated substances into the graphite layer, the distance between the graphite layers increases, and a slight expansion of the intercalated graphite paper can be observed.

[0054] Step 202: Mix urea, 2,2,6,6-tetramethylpiperidine-1-oxyl radical, and ammonium sulfate to make an electrolyte solution. After mixing, the urea in the electrolyte solution is 0.5mol / L, 2,2, 6,6-tetramethylpiperidi...

Embodiment 2

[0064] A preparation method of doped graphene material, comprising the steps of:

[0065] Step 301: Pressing 1g of flake graphite into a graphite rod; mixing concentrated sulfuric acid and glacial acetic acid at a volume ratio of 6:4 to obtain a mixed electrolyte, connecting the graphite rod and the platinum sheet to the positive and negative electrodes of the power supply through wires, and Graphite paper and platinum flakes are immersed in the mixed electrolyte. Start the power supply, control the power supply voltage to 3V for electrochemical intercalation, and the reaction time is 30 minutes to obtain intercalated graphite rods.

[0066] Step 302: Melamine, NaBH 4 , ammonium sulfate mixed to make an electrolyte, the melamine in the electrolyte after mixing is 1mol / L, NaBH 4 2mg / mL, ammonium sulfate 0.1mol / L. The intercalated graphite rod and the platinum sheet are respectively connected to the positive and negative electrodes of the power supply through wires, and the i...

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Abstract

The invention discloses a doped graphene material and a preparation method and application thereof. The preparation method comprises the steps that a graphite material is subjected to electrochemicalintercalation in an acid liquor, and a reaction is carried out to obtain a graphite intercalation material; the graphite intercalation material is subjected to electrochemical reaction doping in a fluorine-containing and / or nitrogen-containing dopant, and the doped graphene material is obtained. The doped graphene material and the preparation method and application thereof have the advantages thatnitrogen-doped and fluorine-doped graphene has thin graphene sheet layers, low oxygen content, high yield and the like; the preparation conditions are controllable, the cost is low, and the preparation method is suitable for mass production; the prepared doped graphene has wide application prospects in energy storage devices, sensors, biomedicine, industrial catalysis and other fields.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a doped graphene material and a preparation method and application thereof. Background technique [0002] Graphene is a single atomic layer ultra-thin two-dimensional crystal material composed of sp2 hybridized carbon atoms connected to each other. It has excellent properties such as large specific surface area, high strength, high carrier mobility, high thermal conductivity, and high thermal stability. , has very broad application prospects. [0003] When graphene is used in semiconductors, graphene is a good conductor with a band gap of zero. It is necessary to adjust the band gap of graphene to make it have semiconductor properties. One of the most effective methods is to dope graphene into impurity atoms. The size and edge morphology of graphene can be changed by element doping, thereby regulating the physical properties of graphene and expanding the application range of ...

Claims

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Application Information

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IPC IPC(8): C01B32/19B01J27/24B01J27/12
CPCB01J27/12B01J27/24C01B32/19C01B2204/20C01B2204/32
Inventor 吴丽琼刘兆平刘湘祁周书瑶
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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