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Activated graphene sheet and preparation method thereof

A graphene sheet and sulfuric acid technology, applied in the field of activated graphene sheet and its preparation, can solve the problems of limiting the application of activated graphene, high preparation cost, etc., and achieve good cycle stability, fewer defects, and small loss rate. Effect

Inactive Publication Date: 2014-09-17
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation of activated graphene is based on graphene oxide, which is difficult to mass-produce and expensive, and the preparation cost remains high, which largely limits the application of activated graphene in new devices such as lithium-ion secondary batteries and supercapacitors. Applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Weigh nitric acid, sulfuric acid, and potassium permanganate in a mass ratio of 2:4.5:0.3 and put them into a reactor to mix uniformly to prepare an intercalation agent, and then add graphene sheets with a thickness of 10-15nm (graphene sheets and intercalation agent The mass ratio is 1:2), stirring for 30 minutes (speed 50rpm), and then adding 30% hydrogen peroxide dropwise into the reaction kettle until no bubbles are generated in the solution. The intercalated graphene sheets were washed with deionized water until neutral, and dried in a vacuum oven at 50°C for 10 hours (vacuum degree 1.0×10 5 Pa). The intercalated graphene sheets were mixed according to the mass ratio of KOH to 1:2, stirred at room temperature, the rotation speed was adjusted to 500rpm, stirred for 4h, allowed to stand for 8h, and then dried in a 65°C drying oven for 24h to obtain Intercalated graphene sheets. The intercalated graphene sheet powder was loaded into a corundum crucible, and then pla...

Embodiment 2

[0051] Weigh nitric acid, sulfuric acid, and potassium permanganate in a mass ratio of 1:10:0.5 and put them into a reactor to mix uniformly to prepare an intercalation agent, and then add graphene sheets with a thickness of 8-10nm (graphene sheets and intercalation agent The mass ratio is 1:5), stirring for 120min (speed 200rpm), and then adding 30% hydrogen peroxide dropwise into the reaction kettle until no bubbles are generated in the solution. The intercalated graphene sheets were washed with deionized water until neutral, and dried in a vacuum oven at 100°C for 2 hours (vacuum degree 1.0Pa). The intercalated graphene sheets were mixed according to the mass ratio of KOH to 1:3, stirred at room temperature, the rotation speed was adjusted to 200rpm, stirred for 1h, allowed to stand for 12h, and then dried in a 65°C drying oven for 24h to obtain Intercalated graphene sheets. Put the intercalated graphene sheet powder into a corundum crucible, then place it in an atmosphere...

Embodiment 3

[0054] Weigh nitric acid, sulfuric acid, and potassium permanganate in a mass ratio of 5:1:1 and put them into a reactor to mix uniformly to prepare an intercalation agent, and then add graphene sheets with a thickness of 2-3nm (graphene sheets and intercalation agent The mass ratio is 1:7), stirring for 60 minutes (speed 100rpm), and then adding 30% hydrogen peroxide dropwise into the reaction kettle until no bubbles are generated in the solution. The intercalated graphene sheets were washed with deionized water until neutral, and dried in a vacuum oven at 80°C for 6 hours (vacuum degree 1.0×10 3 Pa). Mix the intercalation-treated graphene sheet with KOH at a mass ratio of 1:5, stir at room temperature, adjust the rotation speed to 300rpm, stir for 2h, let it stand for 10h, and then dry it in a 65°C drying oven for 24h to obtain Intercalated graphene sheets. Put the intercalated graphene sheet powder into a corundum crucible, then place it in an atmosphere furnace, raise th...

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Abstract

The invention provides an activated graphene sheet and a preparation method thereof. The preparation method of the activated graphene sheet comprises the steps of adding sulfuric acid, nitric acid and potassium permanganate to carry out intercalation treatment on a graphene sheet serving as a raw material and then carrying out KOH activation process. The activated graphene sheet disclosed by the invention has the advantages of good conductivity, large specific surface area, high mesopore content, less impurities, low production cost, low equipment investment, simple operation, excellent electrochemical properties and good physical and chemical stabilities and can be put into industrialization easily.

Description

technical field [0001] The invention belongs to the field of high-performance carbon materials, and in particular relates to an activated graphene sheet and a preparation method thereof. Background technique [0002] In 2004, after obtaining high-quality graphene sheets by simple adhesive tape sticking and tearing method by professors Andre Geim and Konstantin Novoselov of the University of Manchester, the singular quantum Horn It has a wide range of applications in the development of semiconductors, new energy and other new materials and devices due to its characteristics such as the Moore effect, ultra-high thermal conductivity, and good electrochemical performance. Graphene is a two-dimensional material with a theoretical specific surface area of ​​2600m 2 / g, large specific surface area and ultra-high conductivity make graphene a popular research direction for various electrochemical device electrode materials. But in reality, due to the two-dimensional large π conjuga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 林起浪林淑萍徐浩罗诗渊
Owner FUZHOU UNIV
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