Vanadium nitride-pore channel carbon nano composite material, preparation method and application thereof

Abstract

The invention relates to a vanadium nitride-pore channel carbon nano composite material, a preparation method and application thereof. The method comprises the following steps: extracting V in a vanadate radical solution through extraction, so that the requirement of the preparation process on the purity of the vanadium species in the vanadate radical solution is reduced, and the cost of the preparation process is reduced. According to the vanadium nitride-porous carbon nano composite prepared through the method, the average particle size of vanadium nitride ranges from 2 nm to 10 nm, vanadiumnitride is evenly distributed on pore channel carbon, and the pore channel carbon comprises graphite carbon and amorphous carbon, so that the vanadium nitride-pore channel carbon nano composite has excellent electrical conductivity and a large specific surface area; and the V species in the vanadium nitride-pore channel carbon nano composite material prepared by the method mainly exist in the form of vanadium nitride, and the highest content of the V species can reach 42.5%.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a vanadium nitride-hole carbon nanocomposite material and its preparation method and application. Background technique [0002] Vanadium nitride has been widely used in the field of energy storage materials due to its remarkable electrochemical specificity and chemical stability. However, complex material synthesis steps, harsh conditions, and product particle agglomeration are the main problems to be solved in the preparation process. According to literature reports, the preparation process of many nitrides (especially, containing s-block elements) is very sensitive to air and moisture. The existence of these influencing factors will affect the content of nitrides in the product. In order to avoid the agglomeration of transition metal nitrides, in literature reports, templates (melamine) are usually added during the calcination process or vanadium-containing substances are s...

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[0009] CN109205590A discloses a vanadium nitride nanocluster loaded on a 3D carbon foam skeleton and a preparation method thereof, comprising the following steps: the first step, carbonizing melamine foam to obtain a 3D carbon foam; the second step, the first step The 3D carbon foam body is immersed in solution A, and carries out hydrothermal reaction; Solution A is the ammonium metavanadate that concentration is 10~30mol / L, the hexamethylenetetramine of 1~10mol / L and oxalic acid aqueous solution with (1 ~3):(1~4):(1~5) are mixed in volume ratio and stirred sufficiently to obtain; after the reaction is completed and cooled to room temperature, the 3D carbon foam is washed alternately with water and absolute ethanol, and freeze-dried to obtain Intermediate product; in the third step, the intermediate product obtained above is calcined, cooled to room temperature after the reaction, and vanadium nitride nanoclusters supported on the 3D carbon skeleton are obtained; the vanadium source of this scheme can only use chemically pure metavanadic acid Ammonium, its preparation process is more complicated, the cost is higher

[0010] CN109280934A discloses a carbon-coated vanadium nitride electrocatalyst, which uses carbon-rich organic matter as the carbon source, metal vanadium salt as the vanadium source, and urea, ammonium carbonate, ammonium bicarbonate, etc. as the nitrogen source, and is uniformly mixed by mechanical method Finally, carbon-coated VN nanoparticles are obtained by one-step calcination. The purity of the carbon-coated vanadium nitride prepared by this scheme is insufficient, and the carbon in the product is all amorphous carbon, and the preparation cost is also high.

[0011] Although the above-mentioned documents disclose some methods for preparing vanadium nitride-carbon nanocomposites, there are still problems such as high preparation cost and low content of vanadium nitride in the product. Therefore, a low-cost vanadium nitride-carbon nanocomposite is developed. Composite preparation methods are still important

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