Cobalt-nickel-nitrogen sulfide-doped carbon nanofiber composite and preparation method and application thereof

Abstract

The invention discloses a cobalt-nickel-nitrogen sulfide-doped carbon nanofiber composite rich in sulfur vacancies and a preparation method thereof. The preparation method of the composite comprises the steps of pre-oxidizing a polyacrylonitrile nanofiber membrane obtained by electrostatic spinning and then carbonizing the polyacrylonitrile nanofiber membrane at the high temperature to obtain a nitrogen-doped carbon material; enabling Ni-Co precursor nanowires to grow in situ with the nitrogen-doped carbon material as a carrier; adopting an annealing process for obtaining a cobalt-nickel-nitrogen oxide-doped carbon nanofiber composite, and obtaining the cobalt-nickel-nitrogen sulfide-doped carbon nanofiber composite rich in sulfur vacancies through further vulcanization and annealing treatment. The composite prepared by means of the method has the advantages of uniform structure and appearance, high-conductivity nitrogen-doped carbon nanofibers are used as a substrate, a sulfur vacancy-doped cobalt-nickel sulfide uniformly grows outside the hollow nitrogen-doped carbon material, the agglomeration problem of cobalt-nickel sulfides is avoided, and the composite has the advantages oflarge specific surface area, high conductivity, stable physical and chemical properties, excellent electrochemical performance and the like.

Description

technical field [0001] The invention belongs to the technical field of metal sulfide-carbon materials, and in particular relates to a cobalt-nickel-nitrogen-doped carbon nanofiber composite material rich in sulfur vacancies and a preparation method and application thereof. Background technique [0002] With the depletion of non-renewable resources such as coal and oil, the problems of energy shortage and environmental pollution are becoming more and more serious, which gradually become the bottleneck restricting the sustainable development of society and economy. People began to work hard to find renewable clean energy. Hydrogen energy has become the focus of attention due to its advantages such as high calorific value, cleanness, and renewable energy. Based on the above-mentioned important applications in the preparation of green energy and industrial products, electrolytic water hydrogen evolution (HER) has attracted extensive attention from researchers in related fields ...

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Problems solved by technology

However, pure cobalt-nickel sulfide is easy to agglomerate, has poor electrical conductivity, and insufficient contact with the electrolyte, so that electrons cannot be effectively transported, which greatly limits its electrocatalytic effect.

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