A kind of hollow graphene microspheres with high specific surface area and many folds and preparation method thereof

A technology with high specific surface area and graphene, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of not fully showing the superior performance of graphene and small specific surface area, so as to reduce the chance of stacking and increase the ratio Surface area, the effect of reducing the number of stacked layers

Active Publication Date: 2018-06-15
杭州德烯科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its surface also has a lot of wrinkles, but due to the superposition of graphene, its specific surface area is relatively small, and its application is subject to many restrictions, and it cannot fully demonstrate the superior properties of graphene.

Method used

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  • A kind of hollow graphene microspheres with high specific surface area and many folds and preparation method thereof
  • A kind of hollow graphene microspheres with high specific surface area and many folds and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Graphene oxide microspheres were obtained by spraying and drying a graphene oxide aqueous solution with a concentration of 4 mg / mL. The atomization drying temperature is 120°C

[0017] (2) The graphene oxide microspheres obtained in step (1) were rapidly heated to 800°C at 20°C / min and maintained for 10 minutes, and then heated to 3000°C at 5°C / min for graphitization.

[0018] Through the above steps, the obtained high specific surface area multi-fold hollow graphene microspheres have a diameter of 3 μm, such as figure 1 shown. Its specific surface area is 600m 2 / g, the graphene sphere wall is composed of four layers of graphene, such as figure 2 shown.

Embodiment 2

[0020] (1) The graphene oxide DMF solution with a concentration of 1 mg / mL was sprayed and dried to obtain graphene oxide microspheres. The atomization drying temperature is 100°C.

[0021] (2) The graphene oxide microspheres obtained in step (1) were rapidly heated to 1000°C at 15°C / min and maintained for 10 minutes, and then heated to 3000°C at 3°C / min for graphitization.

[0022] Through the above steps, the obtained high specific surface area multi-fold hollow graphene microspheres have a diameter of 6 μm. Its specific surface area is 1100m 2 / g.

Embodiment 3

[0024] (1) A graphene oxide methanol solution with a concentration of 10 mg / mL was sprayed and dried to obtain graphene oxide microspheres. The atomization drying temperature is 150°C

[0025] (2) The graphene oxide microspheres obtained in step (1) were rapidly heated to 1300°C at 18°C / min and maintained for 10 minutes, and then heated to 3000°C at 5°C / min for graphitization.

[0026] Through the above steps, the obtained high specific surface area multi-fold hollow graphene microspheres have a diameter of 3 μm. Its specific surface area is 1500m 2 / g.

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Abstract

The invention discloses high-specific surface area multi-fold hollow graphene microspheres and a preparation method thereof. According to the present invention, a graphene oxide diluted solution is subjected to spraying spheronizing, high temperature expansion and other steps to obtain the hollow graphene microspheres; the hollow graphene microspheres are formed by carrying out physical cross-linking on few layers of graphene having micro-fold, wherein the microsphere wall has a certain strength, and a certain elasticity is provided after the macroscopic assembly; the microspheres are hollow and have the thin wall, such that the microspheres have the great specific surface areas and can be used as the carrier for supporting the catalyst; and with the high temperature treatment process, the graphene flake layer structure is perfect, such that the high-specific surface area multi-fold hollow graphene microspheres have the excellent electrical conductivity so as to be used in the fields of electromagnetic shielding, wave absorbing, batteries, capacitors, and the like.

Description

technical field [0001] The invention belongs to the field of graphene materials, and relates to a hollow graphene microsphere with high specific surface area and many folds and a preparation method thereof. Background technique [0002] Graphene is a new type of two-dimensional carbon material, known as the material of the 21st century. It has outstanding mechanical properties, electrical properties, thermal properties, magnetic properties and huge specific surface area, so it has broad application prospects in many fields. But at present, there is only one type of application of graphene powder, that is graphene flower. Its surface also has a lot of wrinkles, but due to the superposition of graphene, its specific surface area is relatively small, and its application is subject to many restrictions, and it cannot fully demonstrate the superior performance of graphene. [0003] Aiming at the shortcomings of the existing technology, we have prepared a hollow graphene sphere ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184
CPCC01B2204/32C01P2004/32C01P2004/61C01P2004/62
Inventor 高超彭蠡陈琛
Owner 杭州德烯科技集团有限公司
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