Method for preparing different types of nitrogen-doped graphene with low-temperature plasma

A technology of nitrogen-doped graphene and low-temperature plasma, which is applied in the field of electrode materials, can solve the problem that the synthesis process cannot control the type of nitrogen doping, and achieve the effects of easy control of the reaction process, improvement of efficiency, and avoidance of the synthesis process

Inactive Publication Date: 2019-02-22
CAS HEFEI INST OF TECH INNOVATION
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The problem to be solved in the present invention is to provide a method for preparing different types of nitrogen-doped graphene by low-temperature plasma, which simplifies the existing complex methods and harsh conditions, and overcomes the fact that the synthesis process in the prior art cannot be performed at low temperature and low pressure. Regulatory issues of regulating nitrogen doping type, beneficial for large-scale production

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  • Method for preparing different types of nitrogen-doped graphene with low-temperature plasma
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  • Method for preparing different types of nitrogen-doped graphene with low-temperature plasma

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Embodiment 1

[0026] Such as Figure 6 Shown, a kind of method for preparing different types of nitrogen-doped graphene by low-temperature plasma, the method that comprises include: prepare graphene oxide with Hummers method, prepare the graphene oxide solution that concentration is 0.5mg / ml again, nitrogen-containing compound Add it into the graphene oxide solution to obtain a mixed solution, and the mass ratio of the nitrogen-containing compound to the graphene oxide solution is 1:1. The nitrogen-containing compound is a mixture of urea and pyridine with a mass ratio of 10:1. Then the mixed solution was ultrasonically dispersed for 15 minutes to obtain a dispersion of nitrogen-containing compound and graphene oxide. Then, the dispersion liquid was subjected to centrifugation at a rotational speed of 5000 rbm for 5 minutes to obtain a precipitated compound. The precipitated compound was freeze-dried in an environment at a temperature of -40° C. to obtain powders of the nitrogen-containin...

Embodiment 2

[0028] Such as Figure 6 Shown, a kind of method that low-temperature plasma prepares different types of nitrogen-doped graphenes, the method that comprises are: prepare graphene oxide with Hummers method, prepare the graphene oxide solution 10ml that concentration is 30mg / ml again, nitrogen-containing compound Add it into the graphene oxide solution to obtain a mixed solution, and the mass ratio of the nitrogen-containing compound to the graphene oxide is 1:5. Wherein the nitrogen-containing compound is a mixture of ammonia water and pyridine, and its mass ratio is 1:6. Then, the mixed solution was ultrasonically dispersed for 35 minutes to obtain a dispersion solution of nitrogen-containing compound and graphene oxide. Then, the dispersion liquid was subjected to centrifugation at a rotational speed of 8000rbm for 20min to obtain a precipitated compound. The precipitated compound was freeze-dried in an environment at a temperature of -20° C. to obtain powders of the nitrog...

Embodiment 3

[0030] Such as Figure 6 As shown, a method for preparing different types of nitrogen-doped graphene by low-temperature plasma includes the following methods: preparing graphene oxide by the Hummers method, then preparing a graphene oxide solution with a concentration of 50 mg / ml, and adding nitrogen-containing compounds into the graphene oxide solution to obtain a mixed solution, and the mass ratio of the nitrogen-containing compound to the graphene oxide is 1:10. Wherein the nitrogen-containing compound is a mixture of ammonia water and pyridine, and its mass ratio is 1:6. Then, the mixed solution was ultrasonically dispersed for 60 minutes to obtain a dispersion solution of nitrogen-containing compound and graphene oxide. Then, the dispersion liquid was subjected to centrifugation at a rotational speed of 12000rbm for 30min to obtain a precipitated compound. The precipitated compound was freeze-dried in an environment at a temperature of -40° C. to obtain powders of the n...

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Abstract

The invention discloses a method for preparing different types of nitrogen-doped graphene with low-temperature plasma. The method comprises the steps that a nitrogen-containing compound is added intoan oxidized graphene solution with the concentration of 0.5-50 mg / ml to obtain a mixed solution, wherein the mass ratio of the nitrogen-containing compound to the oxidized graphene solution is 1:1-1:10; the mixed solution is subjected to ultrasound dispersion for 15-60 minutes to obtain a dispersion solution; the dispersion solution is subjected to centrifugal separation, a separated precipitate compound is subjected to freeze drying to obtain powder of the nitrogen-containing compound and the oxidized graphene; the powder is subjected to low-temperature plasma discharge in the atmosphere of reducible and / or inert gas to obtain different types of nitrogen-doped graphene. Compared with the prior art, the method is simpler, low in condition requirement and suitable for large-scale production, improves the benefits and reduces the cost.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, in particular to a method for preparing different types of nitrogen-doped graphene by low-temperature plasma. Background technique [0002] Graphene has many excellent physical and chemical properties such as high electrical conductivity, high specific surface area, and high specific strength, so it is widely used in fuel cell catalysts, adsorbents, and electrode materials for supercapacitors. Nitrogen-doped graphene can effectively adjust the graphene structure, and can be divided into three types according to the type of nitrogen doping, namely: pyridine nitrogen, pyrrole nitrogen and graphitized nitrogen. Pyridine nitrogen and pyrrole nitrogen form P-type doping by abstracting electrons from graphene, while graphitized nitrogen replaces carbon in the original six-membered ring for N-type doping. The type of nitrogen doping plays an important role in improving the performance of th...

Claims

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Application Information

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IPC IPC(8): C01B32/184
CPCC01B32/184
Inventor 王奇孙红梅
Owner CAS HEFEI INST OF TECH INNOVATION
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