Preparation method of vanadium carbide nanosheet

Abstract

The invention relates to a preparation method of a vanadium carbide nanosheet, which comprises the following steps: firstly, weighing raw material powder according to the molar ratio of V powder to Al powder to C powder of 2:(1.0-1.2):1, mixing, and ball-milling in an argon atmosphere to obtain solid-phase powder; putting the solid-phase powder into a self-propagating reaction kettle, carrying out a self-propagating reaction in an argon atmosphere, crushing a reaction product, carrying out ball milling in the argon atmosphere, sieving the obtained powder material, taking the powder material of 300-500 meshes, adding the powder material into a hydrofluoric acid solution, carrying out etching while stirring, taking out the powder material after the etching is finished, and washing the powder material with water to neutral to obtain the multilayer vanadium carbide; finally, adding a tetramethylammonium hydroxide solution with the mass concentration of 25% for intercalation, and centrifugally collecting the solid to obtain the vanadium carbide nanosheet. The method is low in energy consumption, safe, environment-friendly, simple and time-saving to operate and low in cost, and the prepared vanadium carbide nanosheet is stable in performance and high in purity, can be used for a supercapacitor electrode material and has good capacitive performance.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a preparation method of vanadium carbide nanosheets. Background technique [0002] Vanadium carbide nanosheets (V 2 C) is a new type of two-dimensional metal transition carbide, which has promising applications in many aspects, such as energy storage and conversion, catalysis, sensing, electromagnetics, optics, and water purification, etc. [0003] Vanadium carbide nanosheets are usually prepared by selectively etching the precursor material V 2 obtained from Al in AlC, while the precursor material V 2 The preparation method of AlC greatly affects the preparation effect of vanadium carbide nanosheets. Currently, the precursor material V 2 The preparation methods of AlC include: self-propagating high-temperature synthesis, pressureless sintering, hot-pressing sintering and other methods. Among them, pressureless sintering needs to be carried out under h...

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Problems solved by technology

[0003] Vanadium carbide nanosheets are usually prepared by selectively etching the precursor material V 2 obtained from Al in AlC, while the precursor material V 2 The preparation method of AlC greatly affects the preparation effect of vanadium carbide nanosheets

Currently, the precursor material V 2 The preparation methods of AlC include: self-propagating high-temperature synthesis, pressureless sintering, hot-pressing sintering and other methods. Among them, pressureless sintering needs to be carried out under high temperature conditions, the heating process is slow, high energy consumption, and high cost; the disadvantages of hot-pressing sintering The process and equipment are complicated, the requirements for production control are strict, the requirements for mold materials are high, the energy consumption is large, the production efficiency is low, the production cost is high, and the prepared grains are small and the structure is dense, which is not conducive to the subsequent preparation of vanadium and niobium carbide nanosheets; Self-propagating high-temperature synthesis is a technology that uses the self-heating and self-conduction of high chemical reaction heat between reactants to synthesize materials. Once the reactants are ignited, they will automatically spread to unreacted areas. Until the reaction is complete, the operation is simple, and it can be carried out under low pressure. The combustion wave of the reaction spreads extremely fast, and the chemical energy generated by the combustion reaction is used to synthesize materials. Generally, no additional energy is needed, and the combustion time is short. Heating and cooling during the combustion process The temperature gradient is large, it is easy to form high-concentration defects and non-equilibrium structures, it is easy to obtain complex phases and metastable phases, and it is easy to directly obtain composite materials, but the performance of the precursor material V2AlC synthesized by self-propagating high temperature in the prior art is unstable and the purity is not enough high

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