Preparation method of two-dimensional ultra-thin niobium disulfide nanosheet and product and application
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A technology of niobium disulfide and ultra-thin bismuth is applied in the field of preparation of two-dimensional ultra-thin niobium disulfide nanosheets, which can solve the problems of long time consumption, low feasibility, and difficult operation, and achieves low cost and controllability. High and reproducible results
Active Publication Date: 2019-02-05
ZHEJIANG UNIV
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Problems solved by technology
The mechanical exfoliation method can prepare large-area ultra-thin two-dimensional materials, but it is difficult to transfer due to its attachment to a specific substrate, so it is of little significance in practical applications
Other methods generally face problems such as difficult operation, low output, uncontrollable product quality, and long time-consuming, which lead to low feasibility of these methods in industrial production
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Embodiment 1
[0057] 1. Preparation of niobium disulfide powder
[0058] (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;
[0059] (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.
[0060] 2. Electrolyte Preparation
[0061] Take 83.4mL of concentrated sulfuric acid, pour it into an appropriate amount of water to dilute, transfer to a 1000mL volumetric flask, set the volume to the mark, and shake well to obtain 1.5M H 2 SO 4 electrolyte.
[0062] 3. If figure 1 As shown, the niobium disulfide powder was peeled off alternately by electrochemical positive and negative electrodes
[0063] (1) The niobium disulfide powder is cured and bonded on the copper sheet thro...
Embodiment 2
[0093] Compared with Example 1, the only difference is that the dispersion solvent used in the ultrasonic process is isopropanol, and other conditions are the same. Such as Figure 9 As shown, the obtained two-dimensional ultrathin niobium disulfide nanosheets exhibited an overpotential of -494mV in an acidic electrolyte.
Embodiment 3
[0095] Compared with Example 1, the only difference is that the dispersion solvent used in the ultrasonic process is dimethyl sulfoxide, and other conditions are the same. Such as Figure 9 As shown, the obtained two-dimensional ultrathin niobium disulfide nanosheets exhibited an overpotential of -386mV in an acidic electrolyte.
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Abstract
The invention discloses a preparation method of a two-dimensional ultra-thin niobium disulfide nanosheet and a product and an application. The preparation method comprises the steps that niobium disulfide powder is solidified and adhered to a copper sheet through conductive silver paint and serves as a working electrode, a platinum sheet is used as a counter electrode, an aqueous solution containing H2SO4 is used as an electrolyte, and the niobium disulfide powder and the platinum sheet are immersed into the electrolyte; the positive voltage and the negative voltage are repeatedly and alternately applied to the working electrode; the electrolyte containing niobium disulfide thin sheets is filtered in a vacuum mode; and after the niobium disulfide thin sheets are washed and dried, the niobium disulfide thin sheets are dispersed in a dispersing solvent, after the ultrasonic crushing treatment, the centrifugal separation is carried out, and freezing and drying are carried out, and finallythe two-dimensional ultra-thin niobium disulfide nanosheet is obtained. The average thickness of the two-dimensional ultrathin molybdenum disulfide nanosheet is not more than 4 nm, the two-dimensional ultra-thin niobium disulfide nanosheet can be an electrolytic water cathode material, and the electrochemical performance is excellent and the stability is good. The technical scheme has the advantages of being simple and efficient, low in cost, high in controllability, good in reproducibility, suitable for industrial production and the like.
Description
technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a preparation method, product and application of a two-dimensional ultrathin niobium disulfide nanosheet. Background technique [0002] The production of hydrogen energy by electrolysis of water technology is an important means to solve the energy crisis and environmental pollution. Compared with other hydrogen energy production technologies, such as fossil fuel hydrogen production, electrolysis of water hydrogen production technology is clean, efficient and convenient. [0003] So far, platinum-based catalysts are still the most efficient electrocatalysts for hydrogen production, but their large-scale applications are limited due to high price and scarce resources. Transition metal sulfides (such as molybdenum disulfide, etc.) have gradually become a research hotspot in the field of electrohydrogen evolution catalysts due to their low cost and high performance....
Claims
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