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Nitrogen-doped graphene/activated carbon composite material, and preparation method and application thereof

A technology of nitrogen-doped graphene and composite materials, applied in the field of nitrogen-doped graphene/activated carbon composite materials and its preparation, can solve the problems of high production cost, uneven dispersion, complex process, etc., and achieve increased single-layer rate and thermal efficiency , the effect of shortening the reaction time

Active Publication Date: 2020-07-24
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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  • Nitrogen-doped graphene/activated carbon composite material, and preparation method and application thereof
  • Nitrogen-doped graphene/activated carbon composite material, and preparation method and application thereof

Examples

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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 a preparation method and an application thereof. The preparation method comprises the following steps: firstly, adding a concentrated acid and a graphite powder and uniformly mixing; then adding KMnO4, and fully mixing and reacting; then adding powdered pitch coke, and continuously carrying out mixing reaction; adding pure water and continuously mixing and reacting; finally, adding hydrogen peroxide to terminate the reaction, and obtaining a mixture after the reaction is finished; filtering and washing the mixture, adding a small molecular nitrogen source, ultrasonically dispersing uniformly in water to obtain a suspension, and performing spray drying on the suspension to obtain a nitrogen-doped graphene oxide / pitch coke composite powder; and finally, uniformly mixing the nitrogen-doped graphene oxide / pitch coke composite powder with alkali, performing high-temperature activation under protectionof an inert atmosphere to obtain an activated material, and washing, filtering, drying and crushing the activated material to obtain the nitrogen-doped graphene / activated carbon composite material.

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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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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