Preparation method of low-layer gauze-shaped nitrogen-doped graphene

A technology of nitrogen-doped graphene and nitrogen-doped graphene, which is applied in graphene, hybrid/electric double-layer capacitor manufacturing, nano-carbon, etc., can solve problems such as slowness, and achieve simple preparation process, easy operation, and material cost. low effect

Active Publication Date: 2020-08-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is relatively little research work on the microstructure and performance changes of materials caused by this method, and most of the research on graphene modification is in the state of exploration, while the research on practical applications is relatively slow.

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  • Preparation method of low-layer gauze-shaped nitrogen-doped graphene
  • Preparation method of low-layer gauze-shaped nitrogen-doped graphene

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Embodiment 1

[0029] The preparation method of the low-layer tulle-like nitrogen-doped graphene of the present embodiment is carried out according to the following steps:

[0030] (1) Preparation of nitrogen-doped graphene:

[0031]Mix 2.0 g of graphite flakes with 220 ml of concentrated sulfuric acid and concentrated nitric acid at a volume ratio of 10:1, and stir at 45°C for 30 min. Subsequently, 12.0 g of potassium permanganate and graphite were added at a mass ratio of 6:1, and the temperature was raised to 60°C for 7 hours after stirring for 40 minutes, and then the temperature was raised to 90°C for 40 minutes. Then the reacted solution was naturally cooled to room temperature. The cooled solution and the ethanol intercalation solvent were mixed and reacted according to the volume ratio of 22:1, treated with ultrasonic waves for 20 minutes, and then added diethanolamine (DEA) to the solution with a volume ratio of 1:100 for nitrogen doping, and the solution was loaded into the reacti...

Embodiment 2

[0041] (1) Preparation of nitrogen-doped graphene:

[0042] Mix 2.0 g of graphite flakes with 220 ml of concentrated sulfuric acid and concentrated nitric acid at a volume ratio of 10:1, and stir at 45°C for 30 min. Subsequently, 12.0 g of potassium permanganate and graphite were added at a mass ratio of 6:1, and the temperature was raised to 60°C for 7 hours after stirring for 40 minutes, and then the temperature was raised to 90°C for 40 minutes. Then the reacted solution was naturally cooled to room temperature. The cooled solution and the ethanol intercalation solvent were mixed and reacted according to the volume ratio of 22:1.5, ultrasonically treated for 30 minutes, and then added diethanolamine (DEA) to the solution with a volume ratio of 2:100 to do nitrogen, and the solution was loaded into the reaction Heat the kettle at 190°C for 10 hours, and finally filter the solution with suction, wash with deionized water and repeat suction filtration until pH = 7, freeze-dry...

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Abstract

The invention belongs to the field of material preparation, and provides a preparation method of low-layer gauze-shaped nitrogen-doped graphene. An ethanol intercalation technology is utilized to disperse a solution obtained after an oxidation reaction into an ethanol solvent, a proper amount of diethanol amine is added after ultrasonic treatment, the mixture is placed in a reaction kettle to be heated, subjected to suction filtration and dried, and the nitrogen-doped graphene is obtained. Secondly, the nitrogen-containing graphene is put into a vacuum tube and embedded into a microwave oven for a certain time; microwave energy is converted into heat through pi electron movement in a graphite hybrid structure, oxygen-containing functional groups in a precursor are decomposed into CO2 and H2O gas, the pressure generated by the gas exceeds Van der Waals' force between lamellas, at the moment, nitrogen-doped graphene lamellas are peeled off, and 1-4 layers of porous nitrogen-containing graphene powder materials are obtained. The whole preparation process is simple, the raw material cost is low, the prepared nitrogen-containing graphene has a porous and interconnected three-dimensionalstructure, a large specific surface area and good conductivity, and after the graphene is used for a supercapacitor, rapid diffusion of electrolyte ions can be promoted, and the specific capacity isimproved.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a preparation method and application of low-layer tulle-like nitrogen-doped graphene ethanol intercalation microwave embedding. Background technique [0002] At present, fossil energy is continuously depleted, and due to the large population base, the demand is increasing. Therefore, the development of new energy sources such as biomass energy, wind energy, ocean energy, nuclear energy and solar energy is imminent. As the country pays more and more attention to environmental issues, research on environmentally friendly processes has been widely recognized. The country advocates low-carbon environmental protection, but it is very important to develop energy storage devices with excellent performance, which can be applied to solar energy storage panels, super capacitors, lithium-ion batteries, fuel cells and new energy vehicles. An ideal electrode material for a sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19H01G11/24H01G11/30H01G11/36H01G11/86
CPCC01B32/19H01G11/24H01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 高波付海洋刘状阚家文李魁孙悦尹俊太
Owner NORTHEASTERN UNIV
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