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Method for preparing high-quality graphene through double-pulse electrochemical technology

A graphene, high-quality technology, applied in the field of materials, which can solve problems such as difficulty in complete removal, troublesome removal of electrolyte and impurity ions, and difficulty in removing anion and cation impurities.

Pending Publication Date: 2021-06-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the published documents and patents of electrochemical preparation of graphene, some use ionic liquid as electrolyte for cathodic intercalation and stripping, and graphene with a thickness of 2 to 3 layers and an oxygen content of 2.5% can be obtained, but in When using ionic liquids as electrolytes, the common problems encountered are that ionic liquids are expensive and difficult to remove complex anion and cation impurities, etc., which are difficult to industrialize.
In addition, there is also the use of a large amount of sulfuric acid and glycine as the electrolyte. Although the stripping speed is very fast, it can be completed within 5 minutes, and graphene with a thickness of 2 to 5 layers can be obtained, but there are also sulfate groups and glycine that are difficult to completely remove. ion
In addition, there is also a solvated electrolyte made of lithium salt and propylene carbonate, so that lithium ions are inserted into the graphite layer during the electrolysis process to peel off to obtain graphene, but there are complex operations, electrolytes and impurity ions after stripping. Remove troubles and increase the cost of industrialization

Method used

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  • Method for preparing high-quality graphene through double-pulse electrochemical technology
  • Method for preparing high-quality graphene through double-pulse electrochemical technology
  • Method for preparing high-quality graphene through double-pulse electrochemical technology

Examples

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Effect test

Embodiment 1

[0040] A method for preparing high-quality graphene by double-pulse electrochemical technology, comprising the following steps:

[0041] a) Select a double-pulse power supply system (that is, double-pulse power supply) to form an AC power supply that can switch between positive and negative poles in real time, and the control frequency is 0.01Hz;

[0042] b) Choose a graphite plate with a thickness of 4 μm and a size of 10cm×10cm as the anode graphite plate and the cathode graphite plate, and use the anode graphite plate and the cathode graphite plate as a group to connect 3 groups in parallel in turn, each group of anode graphite plate and cathode graphite plate The rooms are arranged face to face, and the distance is kept at 2cm;

[0043] c) Select an appropriate amount of 0.5M tetramethylammonium bisulfate electrolyte (the solvent is double-distilled water), keep the cathode graphite plate and the anode graphite plate soaked in the electrolyte for 3cm, then turn on the doub...

Embodiment 2

[0046] A method for preparing high-quality graphene by double-pulse electrochemical technology, comprising the following steps:

[0047] a) Select a dual-pulse power supply system to form an AC power supply that can be switched immediately between positive and negative poles, and the control frequency is 0.1Hz;

[0048] b) Choose a graphite plate with a thickness of 8 μm and a size of 10cm×10cm as the anode graphite plate and the cathode graphite plate, and use the anode graphite plate and the cathode graphite plate as a group to connect 8 groups in parallel in turn, each group of anode graphite plate and cathode graphite plate The rooms are arranged face to face, and the distance is kept at 1.5cm;

[0049] c) Select an appropriate amount of 0.1M tetramethylammonium bisulfate electrolyte (the solvent is double-distilled water), keep the cathode graphite plate and the anode graphite plate soaked in the electrolyte for 4cm, then turn on the double pulse power supply, keep the vo...

Embodiment 3

[0052] A method for preparing high-quality graphene by double-pulse electrochemical technology, comprising the following steps:

[0053] a) Select a dual-pulse power supply system to form an AC power supply that can be switched immediately between positive and negative poles, and the control frequency is 10Hz;

[0054] b) Choose a graphite plate with a thickness of 6 μm and a size of 10cm×10cm as the anode graphite plate and the cathode graphite plate, and use the anode graphite plate and the cathode graphite plate as a group to connect 5 groups in parallel in turn, each group of anode graphite plate and cathode graphite plate The rooms are arranged face to face, and the distance is kept at 2cm;

[0055] c) Select an appropriate amount of 0.5M tetramethylammonium bisulfate electrolyte (the solvent is double-distilled water), keep the cathode graphite plate and the anode graphite plate soaked in the electrolyte for 5cm, then turn on the double pulse power supply, keep the volta...

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Abstract

The invention relates to a method for preparing high-quality graphene by a double-pulse electrochemical technology, which comprises the following steps: (1) selecting graphite plates as an anode graphite plate and a cathode graphite plate respectively, and connecting the anode graphite plate and the cathode graphite plate to two ends of a double-pulse power supply system respectively; and (2) placing an anode graphite plate and a cathode graphite plate in the electrolyte, then starting a double-pulse power supply system and keeping the voltage constant, carrying out alternate intercalation on the anode graphite plate and the cathode graphite plate to realize electrochemical stripping of the graphite plates, and then carrying out solid-liquid separation, cleaning and drying to obtain the high-quality graphene.

Description

technical field [0001] The invention relates to a method for preparing high-quality graphene, in particular to a method for preparing high-quality graphene by double-pulse electrochemical technology, and belongs to the field of material technology. Background technique [0002] The unique electrical and thermal conductivity and mechanical properties of graphene have attracted great research interest from the scientific and industrial circles. With the development of scientific and technological innovation industries, graphene materials show broad application prospects in the fields of electronics, information, energy, materials and biomedicine. From the graphene material itself, graphene with a complete structure is a two-dimensional crystal composed of six-membered benzene rings without any unstable bonds. The surface is in an inert state, and the interaction with other media (such as solvents, etc.) Weaker, and there is a strong van der Waals force between the graphene sh...

Claims

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Application Information

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IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/04C01B2204/32
Inventor 黄富强马文勤毕辉唐宇峰居亚兰韩振
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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