Mesoporous graphene foam as well as preparation method thereof

A technology of mesoporous graphene and layered graphene is applied in the field of mesoporous graphene foam and its preparation, which can solve the problems of difficult industrial scale-up, high C/O ratio, and high raw material cost, and achieve mass production, high C/O ratio and high cost. O ratio, good fluidity

Active Publication Date: 2014-01-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above methods can prepare three-dimensional carbon materials with large-scale and long-range interconnections, there are still some problems. First, the above-mentioned three-dimensional carbon materials are not based on sp 2 Hybrid connections are dominant, and contain more oxygen-containing functional groups, and the C / O ratio is high, which affects the electronic conductivity of the material; secondly, in some large-scale carbon skeletons, there are relatively many graphite layers, not single-layer graphene sheets Stack formation reduces the specific surface area of ​​the material; although KOH etching can form abundant micropores and greatly increase the specific surface area of ​​the material, it will also cause carbon structural defects and have a negative effect on the electrical properties of the material; however, molecular sieves, etc. As a template, although relatively regular microporous or mesoporous carbon can be obtained, its preparation process and technological means are relatively complicated, the experimental conditions are harsh, the cost of raw materials is high, and it is difficult to achieve industrial scale-up; relatively, magnesium oxide is used as a template. Carbon material preparation, although the follow-up purification process is relatively simple, but it is difficult to obtain a three-dimensional structure of the magnesium oxide template. , in the process of growing carbon nanomaterials in a fluidized bed, channeling and other fluidized states are prone to occur, which reduces the utilization rate of carbon sources and the effect of carbon growth, and greatly increases the cost requirements for industrial applications

Method used

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  • Mesoporous graphene foam as well as preparation method thereof
  • Mesoporous graphene foam as well as preparation method thereof
  • Mesoporous graphene foam as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Dissolve 12.32g of polyethylene glycol 2000 in 160ml of deionized water, add 14g of magnesium oxide, and stir at room temperature for 24 hours; transfer the above mixture to a hydrothermal kettle with a volume of 200ml, put it into a homogeneous reactor, and Perform hydrothermal reaction at 200°C for 48 hours, take it out, cool it down to room temperature naturally, filter it with suction, wash it with deionized water, and dry it in an oven at 100°C for 8 hours to obtain the template precursor Mg(OH) 2 ; The resulting template precursor Mg(OH) 2 Put it into a muffle furnace, raise the temperature to 550°C at a heating rate of 1-100°C / min, and burn at a constant temperature of 550°C for 8 hours to obtain a textured magnesium oxide template, such as Figure 5 , Figure 6 and Figure 7 shown. Then, 1.5 g of the obtained textured magnesia template was placed in a quartz fluidized bed, using argon as a carrier gas with a flow rate of 400 sccm; To the reaction temperature...

Embodiment 2

[0039] Dissolve 12.32g of polyethylene glycol 2000 in 160ml of deionized water, add 14g of magnesium oxide, and stir at room temperature for 24 hours; transfer the above mixture to a hydrothermal kettle with a volume of 200ml, put it into a homogeneous reactor, and heat it at 240°C Perform hydrothermal reaction at high temperature for 24 hours, take it out, cool it down to room temperature naturally, filter it with suction, wash it with deionized water, and dry it in an oven at 100°C for 8 hours to obtain the template precursor Mg(OH) 2 Put the obtained sample into a muffle furnace, raise the temperature to 450°C at a heating rate of 1-100°C / min, and burn at a constant temperature of 450°C for 8 hours to obtain a textured magnesium oxide template. Then, place 1.5g textured magnesia template in the quartz fluidized bed, use argon as the carrier gas, and the flow rate is 400 sccm; under this atmosphere, the temperature of the reactor is raised from room temperature to The reacti...

Embodiment 3

[0041] Dissolve 12.32g of polyethylene glycol 20000 in 160ml of deionized water, add 14g of magnesium oxide, and stir at room temperature for 24 hours; transfer the above mixture to a 200ml hydrothermal kettle, put it into a homogeneous reactor, and heat Perform hydrothermal reaction at high temperature for 24 hours, take it out, cool it down to room temperature naturally, filter it with suction, wash it with deionized water, and dry it in an oven at 80°C for 10 hours to obtain the template precursor Mg(OH) 2 Put the obtained sample into a muffle furnace, raise the temperature to 450°C at a heating rate of 1-100°C / min, and burn at a constant temperature of 450°C for 8 hours to obtain a textured magnesium oxide template. Then, 2 g of textured magnesium oxide templates were placed in a fixed bed, using argon as a carrier gas with a flow rate of 600 sccm; ℃, the carbon source methane is introduced, the flow rate is 80sccm, and the space velocity during the reaction is controlled ...

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Abstract

The invention belongs to the technical fields of a novel material as well as preparation, and particularly relates to mesoporous graphene foam as well as a preparation method thereof. The invention realizes hydrothermal preparation of a magnesium oxide texture structure and preparation of the mesoporous graphene foam by using textured magnesium oxide as a template. The mesoporous graphene foam material has abundant mesoporous structures and excellent electric property and can be used as an electrode material of batteries and supercapacitors, so that the energy density and the power density of the batteries or the supercapacitors are expectedly improved to a great extent. The cycling stability of the mesoporous graphene foam material is increased, and the mesoporous graphene foam material combined with materials with high draw ratio or the mesoporous graphene foam material can soften energy storage apparatuses. The advantages have important meaning for realization of commercialization of a new generation of energy storage apparatuses for electromobiles and development of smaller, lighter and flexible portable mobile power supplies. The business prospect is wide. Meanwhile, preparation processes of the high temperature hydrothermal method and a fluidized bed can realize engineering enlargement, so that the method is expected to be industrialized.

Description

technical field [0001] The invention belongs to the technical field of novel materials and their preparation, and in particular relates to a mesoporous graphene foam and a preparation method thereof. Background technique [0002] According to the different hybridization forms of carbon atoms, carbon nanomaterials can be divided into sp 2 nanocarbon and sp 3 Nanocarbons, among which fullerenes, carbon nanotubes, and graphene, which are more familiar to people, are zero-dimensional, one-dimensional, and two-dimensional sp 2 carbon nanomaterials. Studies have shown that these materials have excellent electrical, mechanical, and acoustic properties. For example, the tensile strength of carbon nanotubes can reach 100GPa, while the theoretical conductivity of graphene can reach 10 6 S / cm, the theoretical thermal conductivity can reach 5300W / (m K), and they all have high specific surface area (~10 3 m 2 / g level), these properties indicate that sp 2 Nanocarbon is a class of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01F5/02B82Y40/00C01B32/184
Inventor 魏飞聂晶琦黄佳琦张强骞伟中崔超婕
Owner TSINGHUA UNIV
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