Cobalt-nickel sulfide/nitrogen-doped carbon nano-fiber composite material, preparation method and application thereof

Abstract

The invention belongs to the technical field of a transition metal chalcogenide-carbon material, and particularly to a cobalt-nickel sulfide / nitrogen-doped carbon nano-fiber composite material and a preparation method thereof. According to the preparation method, a polypyrrole / bacterial cellulose composite material is prepared through an acid solution oxidation method;; then high-temperature carbonization is performed on the polypyrrole / bacterial cellulose composite material in a tubular furnace for preparing a nitrogen-doped carbon nano-fiber, and in-situ growth of cobalt-nickel sulfide nano-particles is performed on the surface of the carbon nano-fiber according to a hydro-thermal method. The cobalt-nickel sulfide / nitrogen-doped carbon nano-fiber composite material has advantages of stable chemical property, high conductivity, high specific surface area, etc. According to the cobalt-nickel sulfide / nitrogen-doped carbon nano-fiber composite material and the preparation method thereof, cobalt-nickel sulfide nano-particles are uniformly loaded on the surface of the nitrogen-doped carbon nano-fiber, thereby effectively inhibiting aggregation of cobalt-nickel sulfide nano particles and sufficiently utilizing a three-dimensional network structure of bacterial cellulose. The cobalt-nickel sulfide / nitrogen-doped carbon nano-fiber composite material has advantages of high electric capacity, environment-friendly preparing process, low cost, etc. The cobalt-nickel sulfide / nitrogen-doped carbon nano-fiber composite material can become an ideal super-capacitor electrode material.

Description

technical field [0001] The invention relates to a cobalt nickel sulfide / nitrogen-doped carbon nanofiber composite material, a preparation method of the composite material and an application of the composite material. Background technique [0002] Bacterial cellulose is a natural fiber produced through microbial fermentation. It is different from synthetic fibers required by some complex equipment and large factories. It has the advantages of low price, high mechanical strength, and abundant sources. The porous structure and nanoscale pore size distribution of bacterial cellulose make it have a large specific surface and high porosity, especially the nanoscale carbon fiber surface after high temperature carbonization has many effective reactive sites, which can be used as a good template for Controlled synthesis of nanomaterials with specific morphology or size. Therefore, these special properties make it have extremely broad application prospects in the fields of energy con...

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Problems solved by technology

However, cobalt-nickel sulfide is easy to agglomerate, which significantly inhibits the exposure of its active edges, and is prone to severe volume expansion and contraction during the redox reaction process, resulting in a decrease in its cycle performance.

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