In-situ nitrogen-doped porous carbon nanofiber electrode material and macroscopic preparation method and application thereof

Abstract

The invention relates to a macroscopic preparation method for an in-situ nitrogen-doped porous carbon nanofiber which can be applied to a supercapacitor electrode material. The method comprises the steps of: 1) dissolving a phenol source and an aldehyde source in deionized water according to a certain proportion, adding a surfactant after dissolution, stirring the mixture uniformly, heating the mixture to obtain jelly-like hydrogel, and performing freeze-drying to obtain phenolic resin nanofiber aerogel; 2) performing carbonizing in an inert atmosphere to obtain black carbon nanofibers; 3) grinding the carbon nanofibers and an activator uniformly accord to a certain proportion, further performing carbonizing and activating to obtain porous carbon nanofibers, removing excess impurities fromthe activated carbon nanofibers by centrifugal washing and performing drying to obtain the porous carbon nanofibers. As the in-situ nitrogen-doped porous carbon nanofibers have great adsorption performance and the micro-pore gaps thereof can adsorb a large number of electrolyte ions, so that the in-situ nitrogen-doped porous carbon nanofiber has high specific capacity, excellent rate performanceand cycle stability as the supercapacitor electrode material.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to an in-situ nitrogen-doped porous carbon nanofiber macro-preparation method applicable to supercapacitor electrode materials. Background technique [0002] Carbon nanofibers have the advantages of good electrical conductivity, large specific surface area, and high adsorption performance, and are widely used in water treatment and electrochemical energy storage and other fields. However, its complex synthesis process and high price limit its further development. At present, the synthesis methods of carbon nanofibers mainly include electrospinning method and template method. Although the size of carbon nanofibers obtained by electrospinning method is uniform, it is difficult to widely popularize because of the complicated synthesis process and high cost; while the template method is mainly through SiO 2 Waiting for the hard template to synthesize carbon na...

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Problems solved by technology

Although the above methods have obtained porous carbon nanofibers, the synthesis process is complicated, the yield is small and the energy consumption is large, and it is not suitable for large-scale promotion. In addition, the specific capacity is not high when used as a supercapacitor electrode material, and the electrochemical performance needs to be improved.

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