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High-density high-rigidity graphene porous carbon material as well as preparation method and applications thereof

A technology of porous carbon and graphene, applied in the field of graphene, can solve the problems of graphene formability, low strength, uneven molded products, and difficulties in practical application, so as to improve the doping range and uniformity, and reduce the critical reaction time , the effect of rich pores

Active Publication Date: 2012-10-17
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yang Quanhong et al prepared a large surface area graphene-based porous three-dimensional assembly material by introducing a linking agent and using a hydrothermal method [Yang Quanhong, Tao Ying, Lu Wei, Graphene-based porous macroscopic carbon material and its preparation method, patent number: CN 201010568996.8 ], but the porous material, like other airgel materials, has the characteristics of low density and low strength
In short, this type of porous material focuses on overlapping and cross-linking graphene sheets to form a certain macrostructure, and pays less attention to its graphene formability and strength, and the density of graphene prepared by the mainstream thermal expansion method is very small. , which brings difficulties for its further practical application
However, the preparation of molded products by physical pressing generally has disadvantages such as the need for additional binders, uneven molded products, poor microscopic contact, and cracks due to high temperature treatment.
As a typical carbon-based porous material, activated carbon has a relatively large specific surface area, but due to the introduction of many defects during the activation process, the graphite microchip layer of its basic structural unit is small, resulting in poor conductivity, which hinders it to a certain extent. Its application in energy storage, and its independent molding is also relatively difficult, even if it is formed, its density and hardness are relatively low

Method used

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  • High-density high-rigidity graphene porous carbon material as well as preparation method and applications thereof
  • High-density high-rigidity graphene porous carbon material as well as preparation method and applications thereof
  • High-density high-rigidity graphene porous carbon material as well as preparation method and applications thereof

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Experimental program
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Effect test

Embodiment 1

[0055] Weigh 170 mg of graphite oxide powder material prepared by the Hummer method, add 85 mL of deionized water, and ultrasonically disperse for 2 h at a power of 200 W to obtain a graphene oxide hydrosol; adjust the pH of the above sol to about 3, and uniformly disperse the above The graphene oxide hydrosol was placed in a 100 mL hydrothermal reaction kettle, and the hydrothermal reaction kettle was placed in a muffle furnace with a temperature of 150 °C for 6 h; after the hydrothermal reaction kettle was cooled, the inner tank was opened, and the water phase was poured out. , to obtain a smooth cylindrical material, that is, graphene-based gel, which was dried at 1 °C; then it was heated to a temperature of 700 °C at 5 °C / min under an argon protective atmosphere, and a high temperature was obtained after constant temperature treatment for 5 h. Density and high hardness graphene porous carbon material, the specific surface area of ​​the porous material is 750 m 2 / g, unit v...

Embodiment 2

[0057] Weigh 510 mg of graphite oxide powder material prepared by the Hummer method, add 85 mL of deionized water, and ultrasonically disperse for 2 h at a power of 200 W to obtain a graphene oxide hydrosol; adjust the pH of the above sol to about 8, and the above The uniformly dispersed graphene oxide hydrosol was placed in a 100 mL reaction vessel, and the reaction vessel was heated to a temperature of 500 °C and kept at a constant temperature for 3 h; after the reaction vessel was cooled, the liner was opened, and the water phase was poured out to obtain a smooth cylindrical material. Cut it into thin slices of 1-5 mm and let it dry at room temperature. It was heated up to a temperature of 3600 °C at 5 °C / min under an argon protective atmosphere, and after constant temperature treatment for 2 h, a graphene porous carbon material with high density and high hardness was obtained, and the density of the material was 0.34 g / cm 3 , with a hardness H of 1.68 GPa and a specific su...

Embodiment 3

[0059] Weigh 170 mg of graphite oxide powder material and 17 mg of carbon nanotubes prepared by the Hummer method, add 85 mL of dimethylformamide, and ultrasonically disperse for 3 h at a power of 200 W to obtain the original sol; adjust the pH of the above sol to about 3 , put the above homogeneously dispersed original sol in a 100 mL hydrothermal reaction kettle, put the hydrothermal reaction kettle into a muffle furnace at a temperature of 150 °C for 10 h; open the inner tank after the hydrothermal reaction kettle is cooled, pour After leaving the liquid phase, place it at room temperature to dry; then use chemical activation to treat it, that is, soak it in 3 mol / L KOH solution for 24 hours, then dry it, and heat it up to temperature at 10 °C / min under an argon protective atmosphere. 900 ℃, constant temperature for 0.1 h to obtain a high-density and high-hardness graphene porous carbon material with a specific surface area of ​​2980 m 2 / g.

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Abstract

The invention discloses a high-density high-rigidity graphene porous carbon material as well as a preparation method and applications thereof. The method comprises the following steps: 1. original colloidal sol preparation: adding graphene-based component or a mixture of graphene-based component and auxiliary components into a solvent for dispersion to obtain the original colloidal for preparing the graphene porous carbon material; 2. graphene-based gel preparation: placing the original colloidal sol prepared in the step 1 into a reaction container, reacting for 0.1-100 hours at the temperature of 20-500 DEG C to obtain the graphene-based gel; and 3. high-density high-rigidity graphene porous carbon material preparation: drying the graphene-based gel at the temperature of 0-200 DEG C, increasing temperature to 100-3600 DEG C at anoxic atmosphere for conducting thermal treatment for 0.1-100 hours, or / and reacting for 0.1-50 hours at the temperature of 200-2000 DEG C by adopting an activation reaction method. Compared with the prior art, the prepared graphene-based material has the advantages of high density, high rigidity, abundant pores, large specific surface area and stable pore structure.

Description

technical field [0001] The invention relates to a graphene-based high-density, high-hardness, one-time molding porous carbon material and a preparation method and application thereof, belonging to the technical field of graphene. Background technique [0002] Strictly speaking, graphene is a monoatomic layer of graphite, that is, closely packed into a two-dimensional honeycomb lattice structure. sp 2 Hybrid single-layer carbon atom crystals, which are uneven and wrinkled, are true two-dimensional crystals and are considered to be the building blocks of other sp 2 The basic structural unit of carbonaceous materials. Graphene has excellent electrical, mechanical, thermal, and optical properties. Since its discovery in 2004, it has attracted widespread attention and continues to be a research boom. [0003] Graphene, as a leader in cutting-edge science, is actually closely related to us, for example, it can be found in the pencil scratches left by our writing. However, due...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/336
CPCC01B31/02C01B32/184C01B32/194C01B32/336Y02E60/10Y10T428/13H01M4/583
Inventor 杨全红陶莹吕伟李宝华游从辉张辰康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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