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Expanded graphite paper

A technology of expanded graphite and graphite paper, applied in the field of preparation of expanded graphite paper, can solve the problems of graphene yield less than 20%, low efficiency of electrochemical stripping, etc., to achieve improved stripping efficiency, obvious expansion effect, and environmental friendliness Effect

Active Publication Date: 2016-12-14
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because ordinary commercial graphite paper needs to be rolled during the production process, its structure is very dense. If it is used directly, its electrochemical stripping efficiency is very low, and the yield of graphene is less than 20%.

Method used

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  • Expanded graphite paper
  • Expanded graphite paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First, immerse the graphite paper in liquid nitrogen (-196°C), take it out after 1 minute, and then quickly immerse it in boiling (100°C) pure water, and use the rapid nitrogen evolution and water solidification to form graphite sheets Rapid expansion, after the expansion process is completed, it is taken out, washed with water, and dried to obtain the treated expanded graphite paper. The graphite paper was used as raw material (16.0 g) for electrochemical exfoliation, that is, in a 1 Mol / L sulfuric acid solution, a forward voltage of 3 V was applied to the graphite electrode, and the graphite was rapidly exfoliated into graphene. Finally, 14.2 g of graphene products can be obtained with a yield of 88.8%.

[0019] attached by figure 1 It can be seen that the expansion effect of the treated graphite paper in Example 1 is obvious. attached by figure 2 It can be seen that compared with the original graphite paper, the microscopic appearance of the expanded graphite pap...

Embodiment 2

[0021] First, immerse the graphite paper in liquid oxygen (-183°C), take it out after 1 minute, and then quickly immerse it in ethanol at room temperature (20°C), and use the rapid oxygen evolution and solidification of ethanol to make the graphite sheets rapidly Expansion, after the expansion process is completed, it is taken out, washed with water, and dried to obtain the treated expanded graphite paper. The graphite paper was used as the raw material (17.3 g) for exfoliation, that is, in a 1 Mol / L sulfuric acid solution, a forward voltage of 3 V was applied to the graphite electrode, and the graphite was rapidly exfoliated into graphene. Finally, 14.4 g of graphene products can be obtained with a yield of 83.2%.

Embodiment 3

[0023] First, immerse the graphite paper in liquid carbon dioxide (-37°C), take it out after 5 minutes, and then quickly immerse it in boiling (100°C) pure water, using the rapid precipitation of carbon dioxide and the solidification of water to form graphite sheets Rapid expansion, after the expansion process is completed, it is taken out, washed with water, and dried to obtain the treated expanded graphite paper. The graphite paper was used as the raw material (12.0g) for exfoliation, that is, in a 1 Mol / L sulfuric acid solution, a forward voltage of 3V was applied to the graphite electrode, and the graphite was rapidly exfoliated into graphene. Finally, 9.8 g of graphene products can be obtained with a yield of 81.7%.

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Abstract

The invention belongs to the technical field of the preparation of graphene, and relates to a preparation method of expanded graphite paper. The method is as below: 1) immersing the graphite paper into a low-temperature liquid, maintaining for 30 seconds to 5 minutes, and taking out; 2) and then quickly immersing the graphite paper into a high temperature liquid, and using rapid gas precipitation and liquid solidification for rapid expansion of the sheet layer in the graphite paper; and 3) after expansion, taking out the expanded graphite paper, and then washing and drying to obtain the expanded graphite paper used for electrochemical stripping. Scanning electron microscopy (SEM) observation shows that the treated expanded graphite paper has obviously changed morphology, surface wrinkles and destroyed edge structure, so as to provide favorable conditions for infiltration of electrolyte into the graphite paper in a subsequent electrochemical stripping process. The yield of graphene is more than 80%, which provides the possibility for the mass production of grapheme.

Description

technical field [0001] The invention belongs to the technical field of graphene preparation, and in particular relates to a preparation method of expanded graphite paper. Background technique [0002] In 2004, Professor Andre Geim of the University of Manchester and his colleagues prepared graphene for the first time by mechanically exfoliating highly oriented pyrolytic graphite (HOPG). This discovery overturns the thesis that perfect two-dimensional crystals cannot exist stably at non-absolute zero temperature, which is of milestone significance. Since then, graphene's excellent mechanical properties, thermal properties, electrical properties, and optical properties have also been quickly discovered. Graphene has a large theoretical specific surface area and the above-mentioned unique physical and chemical properties, making it one of the research hotspots in international natural sciences. [0003] So far, a variety of graphene preparation methods have been reported, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01P2004/03
Inventor 潘春旭龚佑宁胡艳
Owner WUHAN UNIV
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