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Method for electrochemical preparation of graphene

An electrochemical and graphene technology, applied in the field of graphene, can solve the problems of unsustainable conductive graphene, unsuitable for large-scale production, complicated preparation process, etc., and achieve good conductivity, good conductivity, and simple preparation process.

Inactive Publication Date: 2020-06-02
DEYANG CARBONENE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to overcome the above-mentioned problems existing in the prior art, and provide a new method for electrochemically preparing graphene. On the one hand, the present invention solves the problem of the collapse of the existing graphite electrode due to the gas generated inside the electrode during the electrochemical reaction. On the other hand, it solves the technical problems of complex preparation process, high cost, unsuitable for large-scale production and easy pollution of the environment in the existing graphene preparation technology. question

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Embodiment 1

[0031] This embodiment discloses a method for electrochemically preparing graphene, comprising the following steps:

[0032] Step (1): Heat the alkyl acid until it melts and then add flake graphite. The alkyl acid is stearic acid. The mass ratio of alkyl acid to flake graphite is 1:1. Embed wires at the time, and make graphite electrodes after pressing and forming.

[0033] Step (2): immerse the graphite electrode as an anode in the electrolyte, apply a DC voltage for electrochemical expansion, and obtain expanded graphite.

[0034] In this step, the graphite electrode is used as the anode, the graphite plate is used as the cathode, and the anode and the cathode are all immersed in a 0.1mol / L sulfate-containing electrolyte, and then a DC voltage of 3V is applied for electrochemical expansion. After electrochemical expansion Prepared expanded graphite.

[0035] Step (3): Alkaline washing is performed on the expanded graphite to remove the alkyl acid. After the alkali washing,...

Embodiment 2

[0037] This embodiment discloses a method for electrochemically preparing graphene, comprising the following steps:

[0038] Step (1): Heat the alkyl acid until it melts and then add flake graphite. The alkyl acid is palmitic acid. The mass ratio of the alkyl acid to the flake graphite is 1:50. Embed wires at the time, and make graphite electrodes after pressing and forming.

[0039] Step (2): immerse the graphite electrode as an anode in the electrolyte, apply a DC voltage for electrochemical expansion, and obtain expanded graphite.

[0040] In this step, the graphite electrode is used as the anode, the graphite plate is used as the cathode, and the anode and the cathode are all immersed in 3mol / L electrolyte containing phosphate and nitrate, which are mixed in any ratio, and then a DC voltage of 8V is applied. Electrochemical expansion, expanded graphite is obtained after electrochemical expansion.

[0041]Step (3): Alkaline washing is performed on the expanded graphite to...

Embodiment 3

[0043] This embodiment discloses a method for electrochemically preparing graphene, comprising the following steps:

[0044] Step (1): Heat the alkyl acid until it melts and then add flake graphite. The alkyl acid is palmitic acid. The mass ratio of the alkyl acid to the flake graphite is 1:100. Embed wires at the time, and make graphite electrodes after pressing and forming.

[0045] Step (2): immerse the graphite electrode as an anode in the electrolyte, apply a DC voltage for electrochemical expansion, and obtain expanded graphite.

[0046] In this step, the graphite electrode is used as the anode, the graphite plate is used as the cathode, and the anode and the cathode are all immersed in 5mol / L of nitrate-containing electrolyte, and then a DC voltage of 15V is applied for electrochemical expansion. Get expanded graphite.

[0047] Step (3): first perform liquid-phase ultrasonic exfoliation on the expanded graphite to obtain graphene slurry, after liquid-phase ultrasonic ...

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Abstract

The invention discloses a method for electrochemical preparation of graphene. The method comprises the following steps of: (1) heating and melting alkyl acid, then adding crystalline flake graphite, mixing the substances uniformly, and carrying out compression molding to obtain a graphite electrode; (2) taking a graphite electrode as an anode, immersing the graphite electrode into an electrolyte solution, and applying a direct-current voltage for electrochemical expansion to prepare expanded graphite; and (3) carrying out liquid-phase ultrasonic stripping on the expanded graphite to obtain a graphene slurry, and drying the graphene slurry to obtain the graphene powder. The invention provides the new method for electrochemical continuous preparation of graphene, and solves the technical problems of complex preparation process, higher cost, unsuitability for large-scale production and easy environmental pollution in the existing graphene preparation technology.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for electrochemically preparing graphene. Background technique [0002] At present, there are many methods for preparing graphene, among which oxidation-reduction method, liquid-phase exfoliation method and mechanical exfoliation method are the main methods, while electrochemical method has become popular in recent years because of its simple preparation process, low energy consumption, low cost and easy industrialization. is also widely used. Electrochemical preparation of graphene is usually based on highly oriented pyrolytic graphite, graphite paper (graphite foil), graphite rod, carbon fiber and other macroscopic overall materials as raw materials, water, ionic liquid or polar organic solution as electrolyte, and anode expansion to prepare graphite alkene. Typical techniques are as follows: [0003] The technical solution disclosed in the patent document with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C25B1/00C25B11/12C25B15/00
CPCC01B32/19C25B1/00C25B15/00C25B11/043
Inventor 黄全国高华
Owner DEYANG CARBONENE TECH
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