Preparation method for cold plasma nitrogen-doped carbon fibers

Abstract

The invention discloses a preparation method for cold plasma nitrogen-doped carbon fibers. The preparation method comprises the steps: (1) placing 1 g of commercially available short chopped carbon fibers in an atmosphere furnace, and carrying out heat preservation for 10-60 minutes at the temperature of 450 DEG C, to obtain heat-treated carbon fibers; (2) adding the heat-treated carbon fibers obtained in the step (1) to 100 mL of H2O2 with the mass concentration of 10%-30%, and oxidizing for 2-24 hours, to obtain oxidized carbon fibers; and (3) placing the oxidized carbon fibers obtained in the step (2) in an N2, NH3 or air atmosphere cold plasma generating device with the gas flow rate of 1 L / min-5 L / min, and carrying out nitrogen doping treatment for 10-60 minutes at 10-40 W, to obtain the nitrogen-doped carbon fibers. The preparation method has the advantages of low energy consumption, easy operation, environmental friendliness, and no need for subsequent cleaning and drying processes; and the obtained product has good structure stability and high nitrogen doping amount.

Description

technical field [0001] The invention relates to a preparation method of cold plasma 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] First, the carbon fiber is acidified and oxidized, and then the graphene sheet on the surface of the carbon fiber is peeled off by heat treatment, which increases the specific surface area and active site...

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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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