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Ultrathin graphene piece, apparatus for preparing ultrathin graphene piece, method for preparing ultrathin graphene piece, capacitor, and method of manufacturing capacitor

a technology of ultrathin graphene and ultrathin graphene, which is applied in the field of ultrathin graphene pieces, apparatus methods for preparing ultrathin graphene pieces, capacitors, etc., can solve the problems of environmental problems and safety problems, the cvd method cannot be used in industrial applications, and the need for a long time for oxidation-reduction process, etc., to achieve the effect of increasing

Inactive Publication Date: 2015-10-15
NAT INST FOR MATERIALS SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to an apparatus and method for preparing ultrathin graphene pieces, which can be used to improve the performance of capacitors, in a high-efficient way. The apparatus includes a graphite electrode and a counter electrode made of graphite, a corrosion resistant alloy, or a precious metal. An electrolytic solution is prepared between the two electrodes, and a porous filter is placed to allow the solution to flow in and out. By immersing the thick graphene piece (which is detached from the graphite electrode) in the filter without allowing it to flow in and out, and keeping it in contact with the graphite electrode, many thick graphene pieces can be made into ultrathin graphene pieces (less than 10 pieces of graphene are overlaid) with a high surface area per unit mass. This method also allows for the formation of holes in the graphene, which further increases the specific surface area and improves capacitor performance. The resulting ultrathin graphene pieces have increased specific surface area and are free of molecules that may bind to the graphene, leading to improved activation and performance of the capacitor. The use of this method also allows for the creation of a capacitor with high performance.

Problems solved by technology

However, since the CVD method is a high-cost preparing method, the CVD method cannot be used for an industrial application.
In addition, it is necessary to take a long time for an oxidation-reduction process.
Furthermore, there are an environmental problem and a safety problem due to the strong acid or the hydrazine.
The procedure is easier compared to that of the chemical exfoliation method, but there is a problem that productivity is low, and there are an environmental problem and a safety problem.
However, in the electrolytic exfoliation method in the related art, since the exfoliating of graphene is performed in a short period of time, intercalating of ions of the electrolytic solution is not sufficient, exfoliating of the graphene is not sufficient, and many graphenes are overlapped.
For this reason, finally, there is a problem that the thick graphene piece in which 10 or more graphenes are overlapped is collected.

Method used

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  • Ultrathin graphene piece, apparatus for preparing ultrathin graphene piece, method for preparing ultrathin graphene piece, capacitor, and method of manufacturing capacitor
  • Ultrathin graphene piece, apparatus for preparing ultrathin graphene piece, method for preparing ultrathin graphene piece, capacitor, and method of manufacturing capacitor
  • Ultrathin graphene piece, apparatus for preparing ultrathin graphene piece, method for preparing ultrathin graphene piece, capacitor, and method of manufacturing capacitor

Examples

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example 1

Preparing Graphene by Continuous Electrolytic Exfoliation

example 1-1

[0222]First, an electrolytic exfoliation apparatus illustrated in FIG. 9 was prepared.

[0223]Here, the highly oriented pyrolytic graphite (HOPG) was used as an anode. A platinum sheet (1×2 cm2) was used as a cathode. A potentio-galvanostat which makes a current between the electrodes into a direct current was used as a power source. The filter paper Millipore having 0.22 μm of the pore size which is manufactured by Whatman was used as a porous filter which covers the electrodes. A sulfuric acid (H2SO4) which is an acidic solution was used as an electrolytic solution. Specifically, a diluted sulfuric acid which is made by diluting a sulfuric acid (4.8 g, 98% of purity) in 100 ml of deionized water was used.

[0224]Conditions for Electrolytic Exfoliation

[0225]First, +1 V was applied between the electrodes for 10 minutes (first voltage applying).

[0226]Then, +10 V was applied for one minute (second voltage applying).

[0227]Then, +15 V was applied for 2 hours (third voltage applying).

[0228]B...

examples 1-2 and 1-3

[0241]As illustrated in Table 2, electrolytic exfoliation method was performed in conditions similar to those in Example 1-1 except that a nitric acid (HNO3) and a hydrochloric acid (HCl) were respectively used as the electrolytic solution, and powder samples of Examples 1-2 and 1-3 were prepared.

[0242]Examples 1-1 to 1-3 were performed as preliminary experiments for comparing three types of electrolytic solutions, such as a hydrochloric acid (HCl), a nitric acid (HNO3), and a sulfuric acid (H2SO4). Among the three types of electrolytic solutions, such as a hydrochloric acid (HCl), a nitric acid (HNO3), and a sulfuric acid (H2SO4), the sulfuric acid showed the most excellent characteristics of electrolytic exfoliation, a diluted sulfuric acid which is made by diluting a sulfuric acid (4.8 g, 98% of purity) in 100 ml of deionized water was determined as a basic electrolytic solution of an acidic solution for electrolytic exfoliation.

TABLE 2ElectrolyticsolutionAnodeCathodeAcidic solut...

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Abstract

The problem addressed by the present invention is to provide an apparatus for preparing ultrathin graphene pieces capable of preparing ultrathin graphene pieces in which less than 10 pieces of graphene are overlapped in large quantities, a method for preparing ultrathin graphene pieces capable of preparing the ultrathin graphene pieces with high yield, an ultrathin graphene piece in which less than 10 pieces of graphene are overlapped, a capacitor having high performance by using the ultrathin graphene piece as an electrode, and an efficient method of manufacturing the capacitor. The above-described problem can be solved by using an apparatus 20 for preparing ultrathin graphene pieces, the apparatus comprising: a graphite electrode 21; a counter electrode 22 which is made of graphite, a corrosion resistant alloy, or a precious metal; an electrolytic solution 25 in which one end sides of the two electrodes 21 and 22 are immersed; a container 24 which stores the electrolytic solution 25; and a power source 28 which is connected to the two electrodes 21 and 22 via wirings 26 and 27. The apparatus is also provided with a porous filter 23 so as to cover at least the immersed part of the graphite electrode 21 that is immersed in the electrolytic solution 25.

Description

TECHNICAL FIELD[0001]The present invention relates to an ultrathin graphene piece, an apparatus for preparing ultrathin graphene pieces, a method for preparing ultrathin graphene pieces, a capacitor, and a method of manufacturing capacitor.[0002]In particular, the present invention relates to an apparatus for preparing ultrathin graphene pieces capable of preparing the ultrathin graphene piece, in which graphenes are continuously exfoliated from a graphite electrode and less than 10 pieces of graphene are overlapped, a method for preparing ultrathin graphene pieces, the ultrathin graphene piece in which less than 10 pieces of graphene are overlapped, a capacitor which uses the ultrathin graphene piece, and a method of manufacturing capacitor.BACKGROUND ART[0003]Graphene is an extremely thin sheet which has a thickness of one carbon atom, and has physical properties and characteristics which exceed those of the materials in the related art, such as high intensity, high conductivity, ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01B31/04H01G9/145H01G9/00H01G9/042C25B9/00C25B13/02
CPCC01B31/0469C25B9/00H01G9/145H01G9/0029H01G9/042C25B13/02B82Y30/00B82Y40/00C01B32/184C01B32/19H01G11/32H01G11/36Y02E60/13
Inventor TANG, JIECHENG, QIANSHINYA, NORIOQIN, LUCHANG
Owner NAT INST FOR MATERIALS SCI
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