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Method for preparing vanadium disulphide nano powder

A nano-powder, vanadium disulfide technology, applied in chemical instruments and methods, nanotechnology, vanadium compounds, etc., can solve the problem of difficult to obtain VS2 pure phase, high cost of preparation of vanadium disulfide powder, difficulty in large-scale production, etc. problems, to achieve the effect of low cost, high yield and high purity

Inactive Publication Date: 2011-04-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, it is difficult to obtain vanadium disulfide powder with superior performance through direct compounding of elements. Most of them are synthesized in organic solvents. The preparation method is complicated and requires expensive costs. 2 The pure phase, which greatly increases the preparation cost of vanadium disulfide powder, it is difficult to achieve large-scale production, and this patent realizes high-quality VS for the first time 2 aqueous phase synthesis

Method used

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  • Method for preparing vanadium disulphide nano powder
  • Method for preparing vanadium disulphide nano powder
  • Method for preparing vanadium disulphide nano powder

Examples

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Embodiment 1

[0039] Hydrothermal synthesis of vanadium disulfide uniform ultra-long nanowires: Take a laboratory hydrothermal reaction kettle, which has a stainless steel shell and a polytetrafluoroethylene liner. Add 3mmol ammonium metavanadate (NH 4 VO 3 ), and added 40ml of water, and then added 1ml of 1mol / L ammonia water to completely dissolve ammonium metavanadate in the alkaline aqueous solution, then added 15mmolTAA, and stirred for 10min. After sealing the hydrothermal autoclave, place it in an oven at 180° C. for 20 h. After natural cooling, the obtained product was washed with deionized water and absolute ethanol to remove possible impurities. Such as figure 1 as shown, figure 1 For the XRD analysis figure of the vanadium disulfide prepared in this embodiment, all X-ray powder diffraction peaks can be indexed as VS 2 powder, and no other impurity peaks appear, so what is synthesized in Example 1 is high-purity VS 2 nanomaterials. figure 2 The FE-SEM photographs of the va...

Embodiment 2

[0041]Hydrothermal synthesis of vanadium disulfide uniform ultra-long nanowires: add 2mmol vanadium pentoxide (V 2 o 5 ), and add 30ml of water, then add 10ml of 1mol / L ammonia water to completely dissolve vanadium pentoxide in the alkaline aqueous solution, then add 12mmolTAA, and stir for 10min. After sealing the hydrothermal autoclave, place it in an oven at 200° C. for 25 h. After natural cooling, the obtained product was washed with deionized water and absolute ethanol to remove possible impurities.

Embodiment 3

[0043] Hydrothermal synthesis of vanadium disulfide uniform ultra-long nanowires: Add 2mmol sodium orthovanadate and 40ml water to the polytetrafluoroethylene liner of a 50ml hydrothermal reaction kettle, then add 14mmol copper reagent, and stir for 10min. After sealing the hydrothermal autoclave, place it in an oven at 150° C. for 30 h. After natural cooling, the obtained product was washed with deionized water and absolute ethanol to remove possible impurities.

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Abstract

The invention provides a method for preparing vanadium disulphide nano powder. The method comprises the following steps: a) sulphur source is added into a hydrothermal device filled with a vanadium source aqueous solution; b) the obtained mixed solution be subjected to is kept at the temperature of 40-300 DEG C; and c) after reaction is completed, natural cooling is carried out, and the product is washed and collected by centrifugation, thus obtaining the vanadium disulphide nano powder. In the invention, the vanadium disulphide nano powder is prepared by hydrothermal synthesis at lower temperature, the vanadium source and the sulphur source react according to the reaction principle of oxidoreduction, fixing of quadrivalence of vanadium is realized, no large-scale equipment and extreme conditions are required, raw materials are cheap and easily available, the cost is low, the process is simple, the yield is high, the purity of the prepared vanadium disulphide nano powder is high, the system is clean, and mass production is easy to realize.

Description

technical field [0001] The invention relates to the field of preparation of nano powders, in particular to a method for preparing vanadium disulfide nano powders based on an aqueous solution method. Background technique [0002] Transition metal dichalcogenides have unique electrical and catalytic properties, and can be widely used in the energy field, such as lithium battery electrodes, catalysts, etc., and are a very important class of materials. Especially vanadium disulfide (VS 2 ) has received special attention. [0003] Vanadium disulfide has a unique layered structure, which is conducive to the adsorption and dissociation of ions, and can embed metal ions such as Li in different proportions. Therefore, it can be used as an electrode material and can greatly improve the properties of the electrode. In addition, vanadium disulfide can undergo CDW (Charge Density Wave, charge density wave) phase transition at around 30°C. This unique property makes it a phase change ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00B82Y40/00
Inventor 吴长征孙旭谢毅
Owner UNIV OF SCI & TECH OF CHINA
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