Methods of forming graphene

A graphene and graphene technology, applied in the field of graphene formation, can solve problems such as inability to obtain high-yield graphene

Inactive Publication Date: 2013-07-03
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method cannot obtain high-yield graphene by electrolysis alone, but requires other mechanical fragmentation methods

Method used

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Effect test

Embodiment 1

[0036] Prepare 100ml of 0.24M sulfuric acid aqueous solution as acidic electrolyte, its pH value is about 0.7. After coating a graphite plate (purchased from Central Carbon, 20×20×2mm, 1.44g) with a semipermeable membrane (single-layer polypropylene, purchased from Celgard) with a pore size of about 40 nm, the graphite plate was connected to the positive electrode of the DC power supply. After the platinum wire is connected to the negative electrode of the DC power supply, the graphite plate covered by the semi-permeable membrane and the platinum wire are immersed in the acid electrolyte. The DC power supply first conducts pre-electrolysis at a constant voltage of 2.5V for one minute, so that the graphite plate is fully soaked in the electrolyte. Then the voltage was adjusted to 10V for 3 hours of electrolysis, and it was observed that the graphite plate gradually peeled off, and a black solid diffused through the semipermeable membrane into the acidic electrolyte. Collect th...

Embodiment 2

[0038] Prepare 100ml of 0.24M sulfuric acid aqueous solution as acidic electrolyte, its pH value is about 0.7. A semipermeable membrane with a pore size of about 40 nm (single-layer polypropylene, purchased from Celgard) was coated with platinum wire and graphite particles (purchased from Central Carbon, with a particle size of 3 μm, a total of 2 g), and the platinum wire coated with the semipermeable membrane Connect the positive terminal of the DC power supply. After another platinum wire is connected to the negative pole of the DC power supply, the platinum wire covered by the semi-permeable membrane and the other platinum wire are immersed in the acid electrolyte. The DC power supply first performs a one-minute pre-electrolysis at a constant voltage of 2.5V, so that the graphite particles are fully infiltrated with the electrolyte. Then, the voltage was adjusted to 10V for 3 hours of electrolysis, and it was observed that the graphite particles peeled off gradually, and a...

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Abstract

Disclosed is a method of forming graphene. A graphite positive electrode (or positive electrode together with graphite material) wrapped in a semipermeable membrane and a negative electrode are dipped in an acidic electrolyte to conduct an electrolysis process. As such, a first graphene oxide having a size larger than a pore size of the semipermeable membrane is exfoliated from the graphite positive electrode (or the graphite material). The electrolysis process is continuously conducted until a second graphene oxide is exfoliated from the first graphene oxide, wherein the second graphene oxide has a size which is smaller than the pore size of the semipermeable membrane to penetrate through the semipermeable membrane. The second graphene oxide diffused into the acidic electrolyte outside of the semipermeable membrane is collected. Finally, the collected second graphene oxide is chemically reduced to obtain a graphene.

Description

【Technical field】 [0001] The present invention relates to methods for forming graphene, and more particularly to methods for electrolyzing graphene. 【Background technique】 [0002] Under the situation of increasing shortage of fossil fuels, the issue of environmental protection and green energy is becoming more and more prominent. Among them, research topics such as electricity storage and hydrogen storage are the core of technologies such as supercapacitors and fuel cells. [0003] However, the bottleneck that the above-mentioned key technologies are currently trying to break through is how to produce high-performance electrode storage and hydrogen storage materials. With the advent of single atomic layer graphene material, its theoretical value of specific capacitance is 531F / g, theoretical value of hydrogen storage rate is 6%, and theoretical value of electrical conductivity is 10. 6 S / cm is an ideal material for electricity storage and hydrogen storage. [0004] The ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C25B1/00
CPCC25B1/00B82Y30/00B82Y40/00C01B32/192
Inventor 谢宇泽黄昆平林鹏
Owner IND TECH RES INST
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