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Preparation method and application of integrated polysaccharide/3D nitrogen-doped graphene-carbon nanotube composite material

A nitrogen-doped graphene and carbon nanotube technology, applied in the field of composite materials, can solve problems such as affecting conductivity, two-dimensional graphene confinement, and thickening of graphene layers.

Inactive Publication Date: 2019-12-24
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the π-π interaction between layers, it will cause an inevitable agglomeration effect, which will thicken the layers of graphene and affect its conductivity.
Therefore, the application of 2D graphene is limited to some extent.

Method used

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  • Preparation method and application of integrated polysaccharide/3D nitrogen-doped graphene-carbon nanotube composite material
  • Preparation method and application of integrated polysaccharide/3D nitrogen-doped graphene-carbon nanotube composite material
  • Preparation method and application of integrated polysaccharide/3D nitrogen-doped graphene-carbon nanotube composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put the expandable graphite into a crucible, place it in a muffle furnace, and heat it at 900°C for 50s to obtain expanded graphite; put 1g of expanded graphite into 500mL dimethylformamide, ultrasonicate for 24h, and repeat with ethanol and water. Wash and filter, and vacuum dry at 60°C to obtain exfoliated graphene; place 1g of exfoliated graphite powder in a mixed acid solution composed of 90mL concentrated sulfuric acid and 30mL concentrated phosphoric acid, cool to 0°C, and then slowly add 10g permanganese Potassium permanganate, control the reaction temperature below 5°C to prevent explosion; after the potassium permanganate is completely dissolved, raise the temperature to 50°C and stir for 12 hours; after the reaction, cool the system to room temperature, add 200mL ice water and 5mL 30% hydrogen peroxide solution until the reaction liquid turns golden yellow, then drop a few drops of hydrogen peroxide with excess hydrochloric acid reaction, centrifuge, wash repea...

Embodiment 2

[0035] Put the expandable graphite in a crucible, place it in a muffle furnace, and heat it at 901°C for 30s to obtain expanded graphite; put 1.1g of expanded graphite in 501mL of dimethylformamide, ultrasonicate for 25h, and wash with ethanol and water Wash and filter repeatedly, and vacuum dry at 65°C to obtain exfoliated graphene; place 1.1g of exfoliated graphite powder in a mixed acid solution consisting of 87mL concentrated sulfuric acid and 27mL concentrated phosphoric acid, cool to 1°C, and then slowly add 9g Potassium permanganate, control the reaction temperature below 5°C to prevent explosion; after the potassium permanganate is completely dissolved, raise the temperature to 55°C and stir for 11 hours; Hydrogen peroxide solution with a mass fraction of 30% until the reaction liquid turns golden yellow, then drip a few drops of hydrochloric acid to react excess hydrogen peroxide, centrifuge, wash repeatedly, and freeze-dry to obtain graphene oxide;

[0036] Disperse ...

Embodiment 3

[0038] Put the expandable graphite into a crucible, place it in a muffle furnace, and heat it at 900.5°C for 40s to obtain expanded graphite; put 1.05g of expanded graphite into 500.5mL dimethylformamide, ultrasonicate for 24.5h, and use ethanol Wash and filter repeatedly with water, and vacuum-dry at 62.5°C to obtain exfoliated graphene; place 1.05g of exfoliated graphite powder in a mixed acid solution composed of 92mL concentrated sulfuric acid and 32mL concentrated phosphoric acid, cool to 0.5°C, and then slowly Add 11g of potassium permanganate, and control the reaction temperature below 5°C to prevent explosion; after the potassium permanganate is completely dissolved, raise the temperature to 52.5°C and stir for 12 hours; after the reaction, cool the system to room temperature, and add 205mL of ice water and 6mL hydrogen peroxide solution with a mass fraction of 30% until the reaction solution turns golden yellow, then drop a few drops of hydrochloric acid to react exces...

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Abstract

The invention discloses a preparation method and application of an integrated polysaccharide / 3D nitrogen-doped graphene-carbon nanotube composite material. The method comprises a step of adding CNT into a GO suspension, adding a pyrrole monomer to obtain a homogeneous GO suspension, adding a pyrrole monomer, carrying out ultrasonic treatment, reacting at certain temperature to obtain gel, and calcining to obtain a 3D nitrogen-doped graphene-carbon nanotube, a step of dispersing SA in deionized water and adding NHS and EDC in a violent stirring process to obtain an activated SA solution, a stepof adding CS into an acetic acid solution and violently stirring to obtain a CS solution, a step of dropwise adding the activated SA solution into the CS solution, reacting, centrifuging, and performing freeze-drying to obtain SA-CS, and a step of mixing SA-CS powder with deionized water, adding 3D NGC and performing ultrasonic treatment, and performing centrifugal washing to obtain the integrated polysaccharide / 3D nitrogen-doped graphene-carbon nanotube composite material. The composite material has better electron transmission performance and can be applied to the fields of supercapacitors,electrochemical sensors, lithium-ion batteries, nano materials and the like.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a preparation method of an integrated polysaccharide / 3D nitrogen-doped graphene-carbon nanotube composite material; the invention also relates to an application of the composite material. Background technique [0002] Graphene is a two-dimensional carbon nanomaterial that has been widely used in supercapacitors, electrochemical sensors, lithium-ion batteries, nanomaterials, and hydrogen storage. However, due to the π-π interaction between the layers, it will cause an inevitable agglomeration effect, which will thicken the layers of graphene and affect its conductivity. Therefore, the application of 2D graphene is limited to some extent. 3D graphene is superior to 2D graphene to a certain extent due to its relatively large specific surface area, exposed more active sites, and fast electron transport performance. N-doped graphene can change the bandwidth of graphene, an...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/32H01G11/36H01G11/86H01M4/36H01M4/38
CPCH01G11/30H01G11/32H01G11/36H01G11/86H01M4/364H01M4/38Y02E60/10Y02E60/13
Inventor 莫尊理王嘉牛小慧杨星帅超赵盼郭瑞斌刘妮娟
Owner NORTHWEST NORMAL UNIVERSITY