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Application of liquid phase stripped niobium disulfide nano sheet

A niobium disulfide, liquid phase exfoliation technology, applied in nanotechnology, niobium compounds, inorganic chemistry and other directions, can solve the problems of low feasibility, difficult operation, long time consumption, etc., to achieve good electrochemical performance and stability, High controllability and good reproducibility

Active Publication Date: 2019-08-06
浙江聿见纺织科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are few reports on the use of two-dimensional transition metal chalcogenides for electrochemical nitrogen fixation, and the existing mechanical exfoliation methods, epitaxial growth methods, and redox methods commonly used in the preparation of two-dimensional material nanosheets generally face difficulties in operation and low yield. Low, uncontrollable product quality and long time-consuming problems, resulting in low feasibility of these methods in industrial production

Method used

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  • Application of liquid phase stripped niobium disulfide nano sheet
  • Application of liquid phase stripped niobium disulfide nano sheet
  • Application of liquid phase stripped niobium disulfide nano sheet

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0036] 1. Preparation of niobium disulfide powder

[0037] (1) Sulfur powder and niobium powder are mixed according to the stoichiometric ratio, and after fully grinding, the mixture is sealed in a vacuum quartz glass tube;

[0038] (2) Use a tube furnace to heat the mixture from room temperature, the heating temperature is 1050°C, the holding time is 10h, the heating rate is 5°C / min, and the temperature is naturally lowered after the heating is completed to obtain niobium disulfide powder.

[0039] 2. Liquid phase exfoliation

[0040] Disperse niobium disulfide powder into N-methylpyrrolidone, and perform ultrasonic crushing treatment with an ultrasonic crusher. The ultrasonic power is 350W, and the ultrasonic time is 10h, in which the ultrasonic works for 1 s and pauses for 0.5 s.

[0041] 3. Centrifugation and Washing

[0042] (1) Centrifuge the niobium disulfide flakes and the N-methylpyrrolidone dispersion, the centrifugal speed is 2000rpm, the centrifugation time is 3...

Embodiment 2

[0059] The liquid phase exfoliation of niobium disulfide nanosheets was prepared as shown in Example 1, except that the dispersion solvent used in the ultrasonic process was isopropanol, and other conditions were the same. When the prepared niobium disulfide nanosheets are used as the cathode catalyst in electrochemical nitrogen fixation in acidic electrolyte, the ammonia production rate is 27.61 μg h when the applied voltage is -0.5V (vs.RHE). -1 mg -1 cat , the corresponding Faraday efficiency is 8.57%;

Embodiment 3

[0061] The liquid phase exfoliation of niobium disulfide nanosheets was prepared as shown in Example 1, except that the dispersion solvent used in the ultrasonic process was dimethyl sulfoxide, and other conditions were the same. When the prepared niobium disulfide nanosheets are used as the cathode catalyst in electrochemical nitrogen fixation in acidic electrolyte, the ammonia production rate is 25.84μg h when the applied voltage is -0.5V (vs.RHE). -1 mg -1 cat ., the corresponding Faraday efficiency is 7.46%;

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Abstract

The invention discloses application of a liquid phase stripped niobium disulfide nano-sheet, wherein the niobium disulfide nano-sheet is used as a cathode catalyst in electrochemical nitrogen fixationin an acidic electrolyte; the preparation method of the niobium disulfide nano-sheet comprises the following steps of: (1) mixing sulfur powder and niobium powder according to a stoichiometric ratio,heating, and naturally cooling after the heating to obtain niobium disulfide powder; (2) adding the niobium disulfide powder into a dispersion solvent and carrying out ultrasonic crushing treatment;(3) performing low-speed centrifugal separation on suspension subjected to the ultrasonic crushing treatment, and collecting the suspension on the upper layer; (4) carrying out high-speed centrifugation on the collected niobium disulfide suspension, collecting to obtain niobium disulfide sheets, washing, and collecting precipitates; and (5) centrifugally separating the precipitate and freezing-drying to obtain the liquid phase stripped niobium disulfide nano-sheet. The niobium disulfide nano-sheet provided by the invention has excellent electrochemical performance and good stability as a cathode material for electrochemical ammonia synthesis.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to an application of liquid-phase exfoliation of niobium disulfide nanosheets. Background technique [0002] Ammonia, as one of the most produced and consumed chemicals in the world, is an important substance in the manufacture of dyes, polymers, fertilizers and explosives, and is also considered a promising green energy carrier and potential transportation fuel for the future The global energy crisis; electrocatalytic nitrogen fixation can theoretically be carried out at normal temperature and pressure, and water and nitrogen are used as raw materials, so it is considered to be a potential replacement technology for industrial ammonia synthesis. Industrial-scale ammonia synthesis mainly relies on the Haber-Bosch process, which operates under high-temperature and high-pressure reaction conditions and requires natural gas as a hydrogen source. Among them, the preparation of am...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/00C01G33/00B82Y40/00
CPCB82Y40/00C01G33/00C01P2004/24C01P2004/64C25B1/00C25B11/04
Inventor 侯阳王晗杨彬雷乐成
Owner 浙江聿见纺织科技有限公司
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