Preparation method of three-dimensional nitrogen-doped carbon fibers

Abstract

The invention discloses a preparation method of three-dimensional nitrogen-doped carbon fibers. The preparation method comprises steps as follows: (1) 1 g of commercially available short carbon fibers are added to a mixed solution of 30 mL of commercially available concentrated sulfuric acid and 10 mL of commercially available concentrated sulfuric acid, the mixture reacts at the temperature of 60 DEG C for 1-4 hours, and acidized carbon fibers are obtained; (2) 1 g of the acidized carbon fibers are put into a crucible and subjected to microwave treatment in a microwave oven; (3) 200 mg of the product obtained in the step (2) is mixed with ammonium salt; (4) the mixture obtained in the step (3) is subjected to thermal treatment in an N2 atmosphere, and the three-dimensional nitrogen-doped carbon fibers are obtained, wherein ammonium salt is one of NH4Cl, (NH4)2SO4 and (NH4)3PO3. The preparation method is simple to operate, the carbon fibers with stable structures are obtained with a microwave expansion method, inorganic salt is taken as a nitrogen source, nitrogen doping treatment is performed in the thermal treatment process, follow-up cleaning and drying processes are not required, and the obtained product has good structural stability and high nitrogen doping content.

Description

technical field [0001] The invention relates to a preparation method of three-dimensional nitrogen-doped carbon fiber. Background technique [0002] Carbon fibers have high mechanical strength, light weight, high electrical conductivity, and stable chemical properties. They can be used as raw materials for wearable electronic devices, solar cells, supercapacitors, and battery electrode materials [ACS Nano, 2013, 7, 5940-5947]. However, carbon fiber is stacked with multilayer graphene flakes, its effective specific surface area is small, and the active sites only exist on the surface of carbon fiber bundles. When used as an electrode material, the internal material cannot be in contact with the electrolyte, and there are few active sites [Adv Mater, 2013, 25, 5956-5970]. [0003] Ji et al first acidified and oxidized carbon fibers, and then used heat treatment to peel off some graphene sheets on the surface of carbon fibers, increasing the specific surface area and active si...

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Problems solved by technology

However, carbon fiber is stacked with multilayer graphene flakes, its effective specific surface area is small, and the active sites only exist on the surface of carbon fiber bundles. When used as an electrode material, the internal material cannot be in contact with the electrolyte, and there are few active sites [Adv Mater, 2013, 25,5956-5970]

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