Method for rapid preparation of graphene powder by freezing filtration

A graphene powder and graphene technology, applied in the field of graphene material preparation, can solve the problems of high equipment investment, high energy consumption, low efficiency, etc., and achieve the effects of reducing energy consumption, reducing preparation cost, and improving preparation efficiency

Active Publication Date: 2013-07-31
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problems of high equipment investment, high energy consumption and low efficiency when the graphene suspension is prepared into graphene powder by using freeze-drying technology, and provides a method for rapidly preparing high-quality graphene powder. Simple, low energy consumption, high efficiency, easy to achieve industrial mass production

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  • Method for rapid preparation of graphene powder by freezing filtration
  • Method for rapid preparation of graphene powder by freezing filtration
  • Method for rapid preparation of graphene powder by freezing filtration

Examples

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Embodiment 1

[0035] In this embodiment, the graphene suspension is exactly the same as the graphene suspension in Comparative Example 1.

[0036] Utilize this graphene suspension to prepare graphene powder, do not adopt the freeze-drying technology in the above-mentioned comparative example 1, but adopt the technology of freezing, thawing, filtering, drying, specifically comprise the following steps:

[0037] (1) exactly the same as step (1) in comparative example 1;

[0038] That is, 200ml of this graphene suspension is packed into a sealed bag and put into a refrigerator for freezing until completely solidified into a frozen block, such as figure 2 As shown, the graphene is black flocculated and the morphology is fixed;

[0039] (2) Take out the frozen block, break it into small pieces, place it in a container, and thaw it at room temperature to obtain a thawed suspension, such as image 3 As shown, the water molecules are separated from the graphene, and the graphene is black floccul...

Embodiment 2

[0046] In this embodiment, the graphene suspension is exactly the same as the graphene suspension in Example 1.

[0047] Utilize this graphene suspension to prepare graphene powder, do not adopt the freeze-drying technology in the above-mentioned comparative example 1, but adopt the technology of freezing, thawing, filtering, drying, and concrete steps are basically the same as the steps in embodiment 1, The difference is that in step (4), the graphene filter cake is gently stirred, and then air-dried to obtain black flocculent graphene powder.

[0048] Measure the specific capacitance of the graphene powder obtained in above-mentioned comparative example 1 and embodiment 2 by cyclic voltammetry, obtain similar Figure 8 As shown in the results, the results show that the electrochemical properties of the graphene powders prepared by the two methods are basically the same, and there is no significant difference.

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Abstract

The invention provides a low cost method for rapid preparation of laminated structure graphene powder from a graphene suspension liquid. The method combines the advantages of freeze drying and conventional filtering methods for treatment of a graphene solution. The method includes: first freezing the graphene suspension liquid into a frozen block, then unfreezing the frozen block to regain the suspension liquid, finally filtering the suspension liquid to obtain a flocculent graphene filter cake, and then performing a conventional drying treatment, thus obtaining the fluffy flocculent graphene powder. Compared with the existing freeze drying method, the method also can maintain the micro-appearance of a graphene sample. And as freeze drying equipment is not adopted for drying, the preparation cost can be greatly reduced, the energy consumption is reduced, and the preparation efficiency is improved, so that the method provided in the invention has extensive practical value and industrial prospects.

Description

technical field [0001] The invention belongs to the technical field of preparation of graphene materials, in particular to a method for preparing graphene powder from a graphene suspension solution. Background technique [0002] Graphene (single layer) is a planar two-dimensional material with a hexagonal honeycomb lattice structure composed of sp2 hybridized carbon atoms. Single layer graphene refers to a graphene sheet whose thickness is about the thickness of a single carbon atom. , Few-layer graphene refers to graphene composed of 3-10 layers of single-layer graphene sheets. Graphene has excellent physical and chemical properties, and has received widespread attention since it was first successfully prepared by scientists in 2004 (Novoselov, K.S. et al. Science. 2004, 306, 666). [0003] In practical applications, graphene often appears in the form of powder. At present, graphene powder is commonly prepared from graphene solution, and conventional preparation methods i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 秦禄昌李选福田天周明
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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