Alkali metal salt assisted ultrasonic stripping processed graphene as well as preparation method and application thereof

An alkali metal salt, ultrasonic exfoliation technology, applied in the direction of graphene, nano carbon, etc., can solve the problem of low exfoliation efficiency of ultrasonic exfoliation graphene, and achieve the effect of excellent electrochemical performance, increased active sites, and improved yield.

Inactive Publication Date: 2019-07-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention solves the technical problem of low stripping efficiency of ultrasonically stripped graphene in the prior art

Method used

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  • Alkali metal salt assisted ultrasonic stripping processed graphene as well as preparation method and application thereof
  • Alkali metal salt assisted ultrasonic stripping processed graphene as well as preparation method and application thereof
  • Alkali metal salt assisted ultrasonic stripping processed graphene as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add graphite powder and sodium pyrophosphate into the sample bottle filled with N-methylpyrrolidone, the concentration of graphite powder in the solvent is 20mg mL -1 , the concentration of sodium pyrophosphate in the solvent is 20mg mL -1 . Sonicate in a sonicator with a power of 100W for 2h to obtain a suspension. The resulting mixture was centrifuged at a centrifugal speed of 2000r / min for 20min, and the supernatant was taken to obtain a graphene suspension. figure 1 and figure 2 Respectively, the transmission electron micrograph and the scanning electron micrograph of the graphene nanosheets peeled out by the method of Example 1 ultrasonically. Thin nanosheets with uniform size can be observed, indicating that the graphite powder was successfully exfoliated as graphene.

[0033] The sodium-salt-assisted ultrasonically exfoliated graphene-modified glassy carbon electrode prepared above was used as a working electrode, and a commonly used three-electrode system was...

Embodiment 2

[0035] Graphite powder and sodium phosphate are added in the sample bottle that N-methylpyrrolidone is housed, and the concentration of graphite powder in solvent is 20mg mL -1 , the concentration of potassium phosphate in the solvent is 20mg mL -1 . Sonicate in a sonicator with a power of 100W for 2h to obtain a mixed solution. The resulting mixture was centrifuged at a centrifugal speed of 2000r / min for 20min, and the supernatant was taken to obtain a graphene suspension.

Embodiment 3

[0037] Add graphite powder and potassium pyrophosphate into the sample bottle filled with N,N-dimethylformamide, the concentration of graphite powder in the solvent is 50mg mL -1 , the concentration of sodium pyrophosphate in the solvent is 50mg mL -1 . Sonicate for 40h in a sonicator with a power of 600W to obtain a mixed solution. The resulting mixed solution was centrifuged at a centrifugal speed of 8000r / min for 40min, and the supernatant was taken to obtain a graphene suspension.

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Abstract

The invention discloses alkali metal salt assisted ultrasonic stripping processed graphene as well as a preparation method and an application thereof and relates to the field of preparation and application of graphene. According to the preparation method, graphite powder and alkali metal salt are added to an organic solvent, and the mixture is subjected to ultrasonic treatment, so that graphite powder is stripped, wherein the alkali metal salt is pyrophosphate or phosphate; an obtained product is centrifuged at the rotating speed of 1,000-8,000 r / min for 5-40 min, precipitates are discarded, aliquid supernatant is obtained, and an ultrasonic stripping processed graphene suspension solution is obtained. The pyrophosphate is sodium pyrophosphate or potassium pyrophosphate, the phosphate issodium phosphate or potassium phosphate, and the organic solvent is N, N-dimethyl formamide or N-methyl pyrrolidone. The stripping efficiency of the graphene prepared through ultrasonic stripping is improved, the thickness of the graphene is effectively reduced, meanwhile, the active sites of the graphene are increased, and the electrochemical sensing performance of the graphene is improved.

Description

technical field [0001] The invention relates to the field of preparation and application of graphene, more specifically, to an alkali metal salt-assisted ultrasonic exfoliation of graphene and its preparation method and application. Background technique [0002] Graphene has excellent mechanical, thermodynamic, optical and electronic properties, such as fast heat conduction, fast electron transfer, large specific surface area, etc., so it is widely used in energy storage, catalysis, sensing and other fields. The preparation methods of graphene are generally divided into "bottom-up" and "top-down" routes. The "bottom-up" method mainly uses silicon carbide or organic small molecules as the carbon source, and the carbon atoms are rearranged or connected under certain conditions to obtain graphene, including chemical vapor deposition and epitaxial growth on the surface of silicon carbide. Wait. The "top-down" method generally weakens the van der Waals force between graphite la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B32/19
Inventor 吴康兵魏飘飘沈健
Owner HUAZHONG UNIV OF SCI & TECH
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