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Method for preparing porous carbon microspheres converted from graphene

A technology of porous carbon and graphene, which is applied in the field of preparation of porous carbon microspheres, can solve the problems of high cost, complex process, difficult mass production and popularization and application

Active Publication Date: 2012-06-27
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems that the current method for preparing porous carbon microspheres is mainly based on the template method, the process is complex, the cost is high, the output is low, and it is difficult to produce in batches and popularize and apply; and the preparation of graphene-converted porous carbon microspheres is provided. method

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  • Method for preparing porous carbon microspheres converted from graphene
  • Method for preparing porous carbon microspheres converted from graphene
  • Method for preparing porous carbon microspheres converted from graphene

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specific Embodiment approach 1

[0012] Embodiment 1: In this embodiment, the preparation method of graphene-converted porous carbon microspheres is carried out according to the following steps: adding graphite oxide into deionized water and ultrasonically exfoliating for 30-300 min to obtain a graphene oxide dispersion liquid, and then adding an initiator Mix well, the initiator is acid or alkali, the concentration of the initiator in the graphite oxide dispersion liquid is 0.01~5mol / L, and then placed in a steel reaction kettle with a polytetrafluoroethylene liner, sealed, and then at 100~5 mol / L Hydrothermal treatment at 250°C for 2 to 40 hours, naturally cooled to room temperature, washed with deionized water for 3 to 6 times, and dried to obtain porous carbon microspheres.

[0013] The diameter of the porous carbon microspheres is 0.5-3 μm, such as 600 nm, 1 μm, 2 μm or 2.5 μm. Specific capacity up to 306F·g -1 above.

specific Embodiment approach 2

[0014] Embodiment 2: The difference between this embodiment and Embodiment 1 is: the graphite oxide is made from natural flake graphite, which is prepared by improving the hummers method (for the specific operation method, see: 1.N.I.Kovtyukhova, P.J.Ollivier, B.R.Martin, T.E.Mallouk, S.A.Chizhik, E.V.Buzaneva, |A.D.Gorchinskiy.Layer-by-Layer Assembly of Ultrathin Composite Films from Micron-Sized Graphite OxideSheets and Polycations|.Chem.Mater.1999,11,771-778.and 2 . W. S. Hummers, R. E. Offeman. Preparation of Graphical Oxide. J. Am. Chem. Soc. 1958, 80, 1339-1339.). Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the concentration of the graphene oxide dispersion liquid is 0.05-50 mg / ml. Other steps and parameters are the same as in the first or second embodiment.

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Abstract

Relating to preparation methods of porous carbon microspheres, the invention provides a method for preparing porous carbon microspheres using strong phosphoric acid as the initiator. The invention solves the technical problems of low specific capacity and poor rate capability in current preparation methods of porous carbon microspheres. The method comprises: adding graphite oxide into deionized water for ultrasonic stripping so as to obtain a graphite oxide dispersion solution, then adding an initiator mixing them uniformly, and placing the mixture in a steel reaction kettle with a polytetrafluoroethylene inner liner, sealing the kettle, then conducting hydrothermal treatment, carrying out natural cooling to room temperature, then performing washing with deionized water, and implementing drying, thus obtaining porous carbon microspheres. With the advantages of simple synthesis process, low cost, and short production cycle, etc., the method of the invention is easy to realize mass production as well as popularization and application. And the prepared carbon microspheres converted from graphene have a specific capacity of 306F.g<-1>, and excellent rate performance, thus boasting very good application prospects in the field of supercapacitors.

Description

technical field [0001] The present invention relates to a preparation method of porous carbon microspheres. Background technique [0002] Since its discovery, graphene has become the focus of scientists' attention due to its unique physical and chemical properties. Graphene is composed of carbon atoms with sp 2 The hybrid connection is composed of a single atomic layer, and its theoretical thickness is only 0.35 nm, which is the thinnest two-dimensional material discovered so far. Graphene has the characteristics of low density, high electrical conductivity and high specific surface area, and has important application prospects in the fields of supercapacitors, lithium-ion batteries, solar cells and hydrogen energy storage. At present, the research on graphene still focuses on how to obtain high-quality graphene from other carbon materials through different physical and chemical methods, such as mechanical exfoliation and graphite oxide reduction. However, there are still...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B32/05
Inventor 曹建云王亚明周玉贾德昌欧阳家虎郭立新
Owner HARBIN INST OF TECH
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