Sulfur-doped cobalt phosphide - carbon nanofiber composite material and preparation method thereof

Abstract

The invention discloses a sulfur-doped cobalt phosphide - carbon nanofiber composite material and a preparation method thereof. The preparation method comprises the following steps of electrospinning a polyacrylonitrile dispersion liquid to obtain a polyacrylonitrile nanofiber membrane; pre-oxidizing the polyacrylonitrile nanofiber membrane and performing heating and carbonization to obtain a carbon nanofiber membrane, and causing the carbon nanofiber membrane to undergo surface hydrophilic treatment, to obtain a carbon nanofiber pretreatment membrane; proportionally dispersing cobalt salt and thiourea in an organic solvent, and then causing the dispersion liquid and the carbon nanofiber pretreatment membrane to be subjected to a solvothermal reaction to obtain a cobalt sulphide / carbon nanofiber composite material; and causing the cobalt sulphide / carbon nanofiber composite material to undergo phosphorylation reaction with sodium hypophosphite to prepare the sulfur-doped cobalt phosphide - carbon nanofiber composite material. The prepared composite material is controllable in morphology, has high specific surface area and excellent conductivity, and can be used as an ideal high-performance electrocatalytic material as well as an electrode material of new energy devices such as supercapacitors and lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of transition metal phosphide-carbon materials, and in particular relates to a sulfur-doped cobalt phosphide / carbon nanofiber composite material and a preparation method thereof. Background technique [0002] The catalytic performance of electrochemical catalysts greatly depends on the electrocatalytic activity of the catalyst. In the first row of transition metal compounds, cobalt-based transition metal compounds have very superior electrochemical catalytic performance. Due to the low free energy barrier required to form adsorbed hydrogen atoms on the surface of cobalt atoms, cobalt-based transition metal compounds are promising electrocatalytic hydrogen evolution catalysts. A large number of studies have shown that although cobalt phosphide nanomaterials have a very superior catalytic ability, they are easy to form agglomerates so that their catalytic active sites cannot be fully exposed, which inhibits t...

AI Technical Summary

Problems solved by technology

A large number of studies have shown that although cobalt phosphide nanomaterials have a very superior catalytic ability, they are easy to form agglomerates and make their catalytic active sites not fully exposed, which inhibits their catalytic hydrogen evolution rate.

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