Process for preparing graphite according to electrochemical method

A graphene and electrochemical technology, applied in the field of electrochemical preparation of graphene, to achieve the effects of thorough intercalation, reduced distance and fast intercalation speed

Active Publication Date: 2017-05-24
DEYANG CARBONENE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and to provide a process for electrochemically preparing graphene. The present invention solves the problem of using strong acids and strong oxidants or expensive and toxic organic solvents in the preparation of graphene in existing electrochemical methods. The problem of using cheap and easy-to-obtain raw materials to prepare graphene and simplify its preparation process and reduce the preparation cost, and finally obtain high-quality and easy-to-disperse graphene

Method used

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  • Process for preparing graphite according to electrochemical method
  • Process for preparing graphite according to electrochemical method
  • Process for preparing graphite according to electrochemical method

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Embodiment 1

[0044] A kind of technique of preparing graphene electrochemically, comprises the steps:

[0045](1) The Lewis acid containing transition metal ions and the protonic acid containing the same anion were prepared into a solution with a mass fraction of 5-30%, and then the above two solutions were mixed according to a mass ratio of 1:1 to prepare an electrolyte. Wherein, the Lewis acid includes one of ferric chloride, aluminum chloride, zinc chloride, manganese chloride and nickel chloride or a mixture of them in any proportion, and the protonic acid is hydrochloric acid.

[0046] (2) Use graphite plate as the negative electrode and graphite paper as the positive electrode, control the distance between the positive electrode and the negative electrode to be 3cm, then completely immerse the graphite paper in the electrolyte solution and perform intercalation at a voltage of 1-3V. There are a small amount of air bubbles on the edge of the graphite paper. After 20-30 minutes of inte...

Embodiment 2

[0050] A kind of technique of preparing graphene electrochemically, comprises the steps:

[0051] (1) Prepare ferric chloride solution with a mass fraction of 5% and hydrochloric acid with a mass fraction of 10%, and then mix the above two solutions according to a mass ratio of 1:1 to prepare an electrolyte.

[0052] (2) Use graphite plate as the negative electrode, graphite paper as the positive electrode, control the distance between the positive electrode and the negative electrode to be 3cm, then completely immerse the graphite paper in the electrolyte and intercalate at a voltage of 1V. When intercalating the graphite paper A small amount of air bubbles were generated at the edge. After 20 minutes of intercalation, the intercalated graphite paper with obvious volume expansion was obtained. The thickness of the intercalated graphite paper was 10 times that of the graphite paper before intercalation, and the surface of the intercalated graphite paper was rough but not No de...

Embodiment 3

[0056] A kind of technique of preparing graphene electrochemically, comprises the steps:

[0057] (1) Prepare aluminum chloride solution with a mass fraction of 30% and hydrochloric acid with a mass fraction of 15%, and then mix the above two solutions according to a mass ratio of 1:1 to prepare an electrolyte.

[0058] (2) Use graphite plate as the negative electrode, graphite paper as the positive electrode, control the distance between the positive electrode and the negative electrode to be 3cm, then completely immerse the graphite paper in the electrolyte and intercalate at a voltage of 3V. When intercalating the graphite paper A small amount of air bubbles were generated at the edge. After 30 minutes of intercalation, the intercalated graphite paper whose volume expanded significantly was obtained. The thickness of the intercalated graphite paper was 100 times that of the graphite paper before intercalation, and the surface of the intercalated graphite paper was rough but ...

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Abstract

The invention discloses a process for preparing graphite according to an electrochemical method. The process comprises the following steps: firstly, mixing lewis acid with protonic acid to obtain electrolyte; secondly, taking graphite paper as an anode, and completely immersing the graphite paper into the electrolyte for intercalating to obtain intercalated graphite paper with expanded volume; thirdly, using the intercalated graphite paper as an anode, immersing the intercalated graphite paper into a solution containing sulfate ions or phosphate anions, and applying voltage to enable the intercalated graphite paper to continuously expand, wherein the intercalated graphite paper gradually falls off to form expanded graphite paste; fourthly, repeatedly washing the graphite paste by using pure water, filtering, then uniformly mixing the graphite paste with the pure water to obtain dilute paste, and sequentially carrying out ultrasonic exfoliation, filtering and drying on the dilute paste to obtain graphene powder. According to the process disclosed by the invention, the problem that a strong acid, a strong oxidant or an expensive poisonous organic solvent is adopted for preparing graphene according to an existing electrochemical method is solved, a preparation process of the graphene is also simplified, and the preparation cost is reduced.

Description

technical field [0001] The invention relates to graphene preparation technology, in particular to a process for electrochemically preparing graphene. Background technique [0002] Graphene is a two-dimensional material composed entirely of carbon atoms. It is the thinnest material found so far. It has excellent mechanical properties, electrical properties, thermal properties, and optical properties. It has potential applications in many fields. But in fact, the prepared graphene is easily agglomerated due to the influence of the preparation method, and it is relatively difficult to disperse. Part of graphene is treated with surfactant to improve its dispersibility when used in the later stage, but the essence of surfactant is to wrap graphene and then charge it with a certain amount, so that the particles repel each other to achieve the dispersion effect, which cannot solve the problem of graphite in essence. ene dispersion problem. [0003] There are many ways to prepare ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B2204/04C01B2204/22C01B2204/32C01P2002/82C01P2004/03
Inventor 黄全国杨桂英姚林高华
Owner DEYANG CARBONENE TECH
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