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Method for preparing nanometer hole graphene in heat contact mode

A technology of nano-holes and graphene, which is applied in the field of preparation of nano-holes graphene, can solve problems such as difficult collection, powder flying, and insufficient safety, so as to avoid danger and inconvenient collection, avoid powder flying, large-scale and fast The effect of high specific surface area

Active Publication Date: 2015-10-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, some people used thermal expansion to prepare porous graphene, but they used graphene oxide powder or large dry graphene oxide solids to prepare. The preparation process produced strong volume expansion, which caused the powder to fly and was not easy to collect. , and not safe enough

Method used

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  • Method for preparing nanometer hole graphene in heat contact mode
  • Method for preparing nanometer hole graphene in heat contact mode
  • Method for preparing nanometer hole graphene in heat contact mode

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0035] In this embodiment, graphene oxide airgel is used as a raw material to prepare large specific surface area and nanoporous graphene airgel, which is carried out according to the following steps:

[0036] Step a, prepare graphene oxide by improved Hummers method, and disperse it into a suspension with deionized water, the concentration is 10mg / mL.

[0037] Step b, freeze-drying the graphene oxide suspension in step a: first put the graphene oxide suspension in a refrigerator to freeze into a solid, and then put it into a freeze dryer whose cold well temperature has reached -50°C to dry, that is Graphene oxide airgel can be obtained as figure 1 The brown columnar airgel solid shown in -a.

[0038]Step c, under the air atmosphere, preheat the heating platform, and adjust the temperature to 300° C., and after the temperature stabilizes, place the graphene oxide airgel in step b directly on the heating platform. After waiting for about 0.1 second, the graphene oxide airgel ...

Embodiment 2

[0045] Step a, prepare graphene oxide by improved Hummers method, and disperse it into a suspension with deionized water, the concentration is 10 mg / mL.

[0046] Step b. Apply the graphene oxide suspension in step a evenly on a flat glass sheet, place it in a constant temperature drying oven at a temperature of 55°C, let the water evaporate, and then tear off the dried film to obtain a smooth surface. And interlayer dense graphene oxide paper.

[0047] Step c, under the air atmosphere, preheat the heating table, and adjust the temperature to 250° C., and after the temperature stabilizes, place the graphene oxide paper in step b directly on the heating table. Wait for about 2-3 seconds, and you can get reduced graphene oxide, that is, nanoporous graphene paper. like Figure 7 As shown in , 7-a is tan smooth surface graphene oxide paper (GO), 7-b is black expanded rough surface nanoporous graphene paper (RGO). 7-c and 7-d are optical photographs of the cross-sections of graph...

Embodiment 3

[0050] Step a, prepare graphene oxide by improved Hummers method, and disperse it into a suspension with deionized water, the concentration is 10mg / mL.

[0051] Step b, freeze-drying the graphene oxide suspension in step a: first put the graphene oxide suspension in a refrigerator to freeze into a solid, and then put it into a freeze dryer whose cold well temperature has reached -50°C to dry, that is Graphene oxide airgel can be obtained as Figure 9 The brown columnar airgel solid shown in -a.

[0052] Step c, under the air atmosphere, preheat the heating platform, and adjust the temperature to 200°C. After the temperature is stable, place the graphene oxide airgel in step b directly on the heating platform. Wait for about 3-5 seconds, the graphene oxide airgel starts to burn from the contact point of the heating platform, accompanied by expansion, until the whole airgel is completely burned, and the burning time is about 0.01s. can be obtained as Figure 9 The black nanop...

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Abstract

The invention discloses a method for preparing nanometer hole graphene in a heat contact mode. The method is characterized in that the nanometer hole graphene is obtained in the manner that graphene oxide aerogel or graphene oxide paper or other dry graphene oxide products make direct contact with a heating source at the relatively low temperature to be spontaneously burnt, expanded and reduced. The graphene oxide aerogel and other dry graphene oxide products serve as materials for preparing the graphene and make direct contact with the heating source under the air atmosphere, spontaneous burning and expanding are generated in the short several seconds, most part of oxygen-containing functional groups are removed rapidly in the form of gas, holes are formed in the defected positions, and therefore the graphene with the large specific surface area and the nanometer holes can be rapidly and efficiently prepared on a large scale.

Description

technical field [0001] The invention relates to a preparation method of nanoporous graphene. technical background [0002] Graphene, a one-atom-thick two-dimensional carbon material, due to its ultra-high specific surface area (~2630m 2 / g), considerable thermal conductivity, excellent electrical conductivity, and mechanical properties, have continuously attracted attention in the past few years. Its unique structure and excellent properties make graphene widely used in the fields of electronic devices, sensors and energy storage / conversion. However, graphene usually undergoes irreversible stacking in the process of preparation and use, and the specific surface area decreases sharply due to the interaction of strong π-π bonds and van der Waals forces between the layers to form graphite layers. When it is used in supercapacitor electrodes, lithium batteries, etc., it is not conducive to better transmission of electrolyte and affects the expression of electrochemical perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCY02P20/129
Inventor 杨秋云张梓晗祝巍王冠中
Owner UNIV OF SCI & TECH OF CHINA
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