A kind of nitrogen-doped graphene/activated carbon composite material and its preparation method and application

A nitrogen-doped graphene and composite material technology, applied in the field of nitrogen-doped graphene/activated carbon composite material and its preparation, can solve the problems of complex process, high production cost, uneven dispersion, etc., and achieves increasing contact area and improving monolayer rate. , Use the effect of thermal efficiency

Active Publication Date: 2021-08-24
SHAANXI COAL & CHEM TECH INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a nitrogen-doped graphene / activated carbon composite material and its preparation method and application, to overcome the problems of uneven dispersion, complicated process and high production cost in the preparation of graphene / activated carbon composite materials in the prior art. Through the reactive dispersion technology and the introduction of nitrogen-containing functional groups in the preparation process, the capacitance performance of the material can be improved and the production cost can be reduced

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  • A kind of nitrogen-doped graphene/activated carbon composite material and its preparation method and application
  • A kind of nitrogen-doped graphene/activated carbon composite material and its preparation method and application

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preparation example Construction

[0028] A preparation method of nitrogen-doped graphene / activated carbon composite material, combining figure 1 , including the following steps:

[0029] 1) Add concentrated acid and graphite powder into the reaction kettle and mix well; slowly add KMnO 4 And fully mix the reaction; add powdered pitch coke to continue the mixing reaction; slowly add pure water to continue the mixing reaction; add hydrogen peroxide to end the reaction.

[0030] Among them, the graphite powder is one of 100-20000 mesh flake graphite, expanded graphite, and intercalated graphite; the powdered pitch coke is a pitch coke with a particle size of ≤200 μm after crushing, and the ash content is ≤10%; the concentrated acid is preferably concentrated sulfuric acid, concentrated At least one of phosphoric acid and concentrated nitric acid; hydrogen peroxide is commercially available hydrogen peroxide with a concentration of 30%; the mass ratio of each material added is: 1 part of graphite powder, 70-400 p...

Embodiment 1

[0039] Add 10kg of concentrated sulfuric acid into a stirred tank with an interlayer, add 50g of 1000 mesh flake graphite powder during the stirring process, and stir for 30min to mix evenly, slowly add 200g of KMnO 4 In this process, 5°C cooling water is passed through the interlayer of the reaction kettle; the above-mentioned solid-liquid mixture is stirred and reacted for 180 minutes, and then 1000 g of pitch coke that has been crushed and passed through a 300 mesh sieve is added, and the stirring reaction is continued for 60 minutes. After lowering the temperature of the above solid-liquid mixture to 30°C, slowly add 10kg of distilled water, keep the temperature in the kettle at 60°C and stir for 120min, then add 200g of hydrogen peroxide and stir for 30min; add 100ml of 1‰ polyacrylamide flocculant to make the solid in the suspension After fully flocculating, filter, and wash the filter cake with deionized water until pH=3; disperse the filter cake in water, add 300g of me...

Embodiment 2

[0041] Add 15kg of concentrated sulfuric acid into a stirred tank with an interlayer, add 50g of 1000 mesh flake graphite powder during the stirring process, and stir for 30min to mix evenly, slowly add 250g of KMnO 4 In this process, 5°C cooling water is passed through the interlayer of the reaction kettle; the above-mentioned solid-liquid mixture is stirred and reacted for 180 minutes, and then 1700 g of pitch coke that has been crushed and passed through a 300-mesh sieve is added, and the stirring reaction is continued for 60 minutes. After lowering the temperature of the above solid-liquid mixture to 30°C, slowly add 15kg of distilled water, keep the temperature in the kettle at 60°C and stir for 120min, then add 250g of hydrogen peroxide, and stir for 30min; the rest of the steps are the same as in Example 1. The composite graphene: activated carbon mass ratio is about 2:100, the nitrogen content in the composite material is 3at%, and the specific surface area is 2235m 2 ...

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Abstract

The invention discloses a nitrogen-doped graphene / activated carbon composite material and its preparation method and application. First, add concentrated acid and graphite powder and mix evenly; then add KMnO 4 and fully mix the reaction; then add powdered pitch coke, continue the mixing reaction; then add pure water to continue the mixing reaction; finally add hydrogen peroxide to terminate the reaction, and obtain a mixture after the reaction ends; then filter the above mixture, After washing, adding a small molecular nitrogen source, ultrasonically disperse in water to obtain a suspension, and spray-dry the suspension to obtain a nitrogen-doped graphene oxide / pitch coke composite powder; finally take a nitrogen-doped graphene oxide / pitch coke composite powder and The alkali is mixed evenly, and activated at high temperature under the protection of an inert atmosphere to obtain an activated material. After the activated material is washed, filtered, dried, and pulverized, a nitrogen-doped graphene / activated carbon composite material is obtained.

Description

technical field [0001] The invention belongs to the technical field of capacitor material preparation, and in particular relates to a nitrogen-doped graphene / activated carbon composite material and its preparation method and application. Background technique [0002] Supercapacitor is a new type of energy storage device with high specific energy of battery and high specific power of traditional capacitor. Its electrode material directly affects its performance. Activated carbon has been widely used in supercapacitor materials due to its well-developed pore structure and low manufacturing cost. However, the conductivity of activated carbon is poor, which affects its power density, rate performance and utilization of electrode materials. Graphene has excellent electrical conductivity and two-dimensional flexible structure, and it can be used as an excellent electrode material due to its dual characteristics of electrical conductivity and energy storage when applied to superca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/34H01G11/86
CPCH01G11/32H01G11/34H01G11/86
Inventor 吕晓丽王小宪肖荣林吴浩波马卫平巩阳李克伦苏艳敏王文婧
Owner SHAANXI COAL & CHEM TECH INST
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