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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 th

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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
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Example Embodiment

[0035] Example 1

[0036] 1. Preparation of niobium disulfide powder

[0037] (1) Mix sulfur powder and niobium powder in a stoichiometric ratio, and seal the mixture in a vacuum quartz glass tube after thorough grinding;

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

[0039] 2. Liquid phase stripping

[0040] Disperse the niobium disulfide powder into N-methylpyrrolidone, and perform ultrasonic crushing treatment with an ultrasonic breaker. The ultrasonic power is 350W, the ultrasonic time is 10h, the ultrasonic work is 1 s, and the pause is 0.5s.

[0041] 3. Centrifugation and washing

[0042] (1) Centrifugally separate the niobium disulfide flakes and the N-methylpyrrolidone dispersion at a speed of 2000rpm and a centrifugal time of 30min, and then take the supernatant;...

Example Embodiment

[0058] Example 2

[0059] The liquid phase exfoliated niobium disulfide nanosheets were 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 acid electrolyte, when the applied voltage is -0.5V (vs. RHE), the ammonia production rate is 27.61μg h -1 mg -1 cat , The corresponding Faraday efficiency is 8.57%;

Example Embodiment

[0060] Example 3

[0061] The liquid-phase exfoliated niobium disulfide nanosheets were 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 an acid electrolyte, when the applied voltage is -0.5V (vs. RHE), the ammonia production rate is 25.84 μg h -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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