Method for preparing graphene powder by electrochemistry

A graphene powder, electrochemical technology, applied in the direction of electrolysis process, electrolysis components, etc., to achieve the effect of reducing pollution, low cost, simple and fast preparation process

Active Publication Date: 2012-07-04
深圳市贝特瑞新能源技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for electrochemically preparing graphene powder. The te

Method used

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  • Method for preparing graphene powder by electrochemistry

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Embodiment 1

[0036] Example 1, preparation of positive electrode: Highly oriented pyrolytic graphite was glued on a tungsten wire with a diameter of 0.1 mm and a length of 50 cm, and then wound on a silver sheet with a size of 5 cm×8 cm and a pitch of 2.5 cm. Negative electrode: a platinum cylindrical electrode with a diameter of 2 mm is used. In a 250mL beaker, dissolve 4g of 98% concentrated sulfuric acid in 100mL of deionized water, then add dropwise 30% KOH solution to adjust the pH of the solution to 0.50, and place the above two electrodes in parallel with a distance of 1cm. Connected as an electrochemical device with copper wires. First apply a voltage of 1.0V on the positive electrode for 10 minutes, then raise the voltage to 3V for 1 minute, small bubbles begin to appear on the surface of the graphite and platinum electrodes, and the edges of the graphite begin to dissolve. After 5 seconds, the whole and the end begin to expand, and continue to raise the voltage to 25V, the graph...

Embodiment 2

[0037] Example 2, preparation of positive electrode: stick highly oriented pyrolytic graphite on a tungsten wire with a diameter of 0.5 mm and a length of 10 cm, and then wind it on a silver sheet with a size of 1 cm×3 cm and a pitch of 0.7 cm. Negative electrode: a platinum cylindrical electrode with a diameter of 5mm is used. In a 250mL beaker, dissolve 4g of 98% concentrated sulfuric acid in 100mL of deionized water, then add dropwise 30% KOH solution to adjust the pH of the solution to 7.00±0.19, place the above two electrodes in parallel with a distance of 6cm . Connected as an electrochemical device with copper wires. First apply a voltage of 2.5V on the positive electrode for 1min, then increase the voltage to 10V, and continue for 0.5min, bubbles will appear continuously on the surface of the graphite and platinum electrodes, then increase the voltage to 20V, the graphite begins to dissolve and decompose into small pieces, and the solution begins It turns brownish ye...

Embodiment 3

[0038] Example 3, preparing the positive electrode: the expanded graphite is installed in a plastic tube with a 0.1 μm sieve opening with a laser on the tube wall with an inner diameter of 10 mm, the tube is wrapped by a 350 mesh screen, and a metal Ni electrode with an outer diameter of 1 mm is inserted Which made the positive electrode. Negative electrode: a platinum cylindrical electrode with a diameter of 5 mm is used. In a 250mL beaker, dissolve 4g of 98% concentrated sulfuric acid in 100mL of deionized water, then add dropwise 30% KOH solution to adjust the pH of the solution to 10.00±0.05. Place the above two electrodes in parallel with a distance of 5cm. Connected as an electrochemical device with copper wires. First apply a voltage of 0.1V on the positive electrode for 10 minutes, then increase the voltage to 2.5V for 5 minutes, continuous bubbles appear on the surface of the graphite and platinum electrodes, then increase the voltage to 25V, the graphite begins to d...

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Abstract

The invention discloses a method for preparing graphene powder by electrochemistry. The method solves the technical problems that the pollution on environment caused in production process is reduced, and the preparation cost is reduced. The method comprises the steps of applying 0.1-2.5V and 10-25V direct-current voltage between the positive pole and the negative pole of an electrolytic cell; filtering, washing and drying; dispersing in an organic solvent; collecting clear liquid containing graphene; and drying to obtain graphene. Compared with the prior art, the method of the invention uses electrochemistry synthesis, carries out fast synthesis from raw material graphite by processes of layer inserting and inserting-off, avoids addition of harmful chemical reagents in redox process, reduces pollution on environment, reduces cost, is simple and fast in preparation process, and is convenient for industrial production. The prepared graphene powder is graphene with 1-20 layers, is widely applied to the technical fields of lithium-ion batteries, supercapacitors, solar batteries, electro-catalysis, bio-analysis and biosensors.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for electrochemically preparing graphene. technical background [0002] Graphene is a two-dimensional periodic honeycomb lattice structure composed of carbon six-membered rings, which can be warped into zero-dimensional fullerenes, rolled into one-dimensional carbon nanotubes or stacked into three-dimensional graphite, so graphene is The basic unit that constitutes other graphite materials. Graphene materials also have some excellent properties of graphite and carbon nanotube materials, such as high thermal conductivity and high mechanical strength, and nanocomposites prepared with graphene also exhibit many excellent properties. It can be predicted that graphene will have a wide range of applications in the field of materials. What is even more peculiar about graphene is that it has a unique electronic structure and electrical properties. For example, the anomalous ...

Claims

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Application Information

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IPC IPC(8): C25B1/00
Inventor 梁奇梅佳陈冠雄时浩吕雪孔东亮
Owner 深圳市贝特瑞新能源技术研究院有限公司
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