Method for preparing graphene from three-dimensional porous carbon material and three-dimensional porous graphene

A three-dimensional porous and graphene technology, applied in the field of three-dimensional porous carbon material grapheneization and three-dimensional porous graphene, can solve the problems affecting the application of three-dimensional graphene, the large pore size of graphene, and the inability to maintain the three-dimensional skeleton, and achieve stable pores, The effect of high thermal conductivity and high electrical conductivity

Active Publication Date: 2012-07-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0005] However, the templates used in the above method are metal templates such as nickel foam, and the resulting graphene has too large a pore size, and its three-dimensional skeleton cannot be maintained after removing metal templates such as nickel foam with an etching solution.
This major problem has seriously affected the application of 3D graphene in the field of energy storage

Method used

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  • Method for preparing graphene from three-dimensional porous carbon material and three-dimensional porous graphene
  • Method for preparing graphene from three-dimensional porous carbon material and three-dimensional porous graphene
  • Method for preparing graphene from three-dimensional porous carbon material and three-dimensional porous graphene

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preparation example Construction

[0035] a) Preparation of three-dimensional macroporous carbon powder material: SiO with a particle size of 100-800nm 2 The microsphere colloid is assembled into a template by deposition, and the template gap is filled with a solution with a mass concentration of 1%-15% organic matter. After carbonization at a high temperature of 700-1000°C, SiO is removed with a 10%-30% HF solution 2 template to obtain a three-dimensional ordered hexagonal macroporous carbon material. The pore size distribution is 80-750nm, and the large pores are connected by small windows to form an internal three-dimensional cross-linked macropore network;

[0036] b) Three-dimensional macroporous carbon powder material is transformed into three-dimensional porous graphene:

[0037] Place the three-dimensional macroporous carbon powder material obtained in a) or other commercial three-dimensional carbon materials in a tube-type atmosphere furnace, and after vacuuming to below 20Pa, the flow rate of 5-40 sc...

Embodiment 1

[0050] 1) Preparation of three-dimensional macroporous carbon material: use analytically pure ethyl orthosilicate, absolute ethanol, ammonia water and deionized water with a mass fraction of 25%, according to the volume ratio of 1:10:0.2:0.1, at room temperature Down mixing and continuous stirring for 2 hours; adding a volume ratio of 20% of a mass concentration of 10% PVA ethanol solution, stirring for 2 hours; then aged for 5 days, and finally refluxed for 12 hours to prepare organic matter / SiO 2 Precursor Sol. The white powder after the sol is suction filtered and dried; the above white powder is placed in a tubular atmosphere furnace, and the temperature is raised to 900°C under anaerobic conditions for carbonization to obtain three-dimensional amorphous carbon. The above black powder was placed in HF solution with a mass fraction of 30%, and stirred for 1 hour to fully remove the silica template. After filtering and drying, the three-dimensional macroporous amorphous car...

Embodiment 2

[0059] 1) Preparation of three-dimensional macroporous carbon thin film material

[0060] Use analytically pure tetraethyl orthosilicate, absolute ethanol, ammonia water and deionized water with a mass fraction of 25%, according to the volume ratio of 1:10:0.2:0.1, mix and continuously stir at room temperature for 2 hours; add volume The ethanol solution of 10% PVA with a mass concentration of 20% was stirred for 2 hours; then aged for 5 days, and finally refluxed for 12 hours to prepare organic matter / SiO 2 Precursor Sol. Then use 25×75mm 2 Quartz sheet, SiO prepared by pulling coating technology at a speed of 10mm / min 2 / PVA transparent film layer, the thickness is 50nm;

[0061] 2) Grapheneization of three-dimensional macroporous carbon thin film materials

[0062] The above-mentioned transparent film is placed in a tube-type atmosphere furnace, and after vacuuming to 10Pa, the flow rate of 20sccm H 2 . After the atmosphere furnace is heated up to the target temperatu...

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Abstract

The invention aims at providing a method for preparing graphene from a three-dimensional porous carbon material and three-dimensional porous graphene. The invention adopts the technical scheme that according to the method, a carbon atom of the three-dimensional porous carbon material is activated by using a high-activity hydrogen plasma; and the carbon atom of a foreign carbon source is captured by using high-activity carbon, so that the carbon atom is grown to form the three-dimensional porous graphene and the further the three-dimensional porous graphene is obtained. According to the method for preparing graphene from three-dimensional porous carbon material, which is disclosed by the invention, three-dimensional porous amorphous carbon or three-dimensional porous graphene material is directly grown and converted into the high-quality three-dimensional porous graphene without damaging the three-dimensional porous structure of the three-dimensional porous graphene, so that a pore canal is stable; and the prepared three-dimensional graphene has higher conductivity and can be widely applied to new energy devices such as solar cells, super capacitors and lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of graphene material preparation, in particular to a method for grapheneizing a three-dimensional porous carbon material and three-dimensional porous graphene. Background technique [0002] Graphene is a new carbonaceous material that is densely packed into a two-dimensional honeycomb lattice structure by a single layer of carbon atoms. the basic unit of . Due to its unique two-dimensional structure and perfect crystal structure, graphene contains rich and novel physical phenomena, which provides an ideal platform for the study of quantum electrodynamic phenomena and has important theoretical research value; at the same time, graphene has Atomic-level thickness, excellent electrical properties, excellent chemical stability and thermodynamic stability are expected to be widely used in high-performance nanoelectronic devices, sensors, nanocomposites, batteries and supercapacitors, field emission materials and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 黄富强林天全
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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