Nano Monolayer Tungsten Disulfide Hydrothermal Synthesis

Supercapacitor is a new, efficient and practical energy storage device between battery and traditional capacitor. It has the advantages of fast charge-discharge speed, high power density, long service life, wide temperature window and friendly environment. In recent years, flexible supercapacitor has attracted more and more attention due to its unique advantages.

In TMDC, two layers of sulfur atoms are sandwiched with metal atoms in the middle, which is a sandwich S-M-S-like structure. Transition metal chalcogenides have the characteristics of semiconductors and obvious anisotropy. And each layer shows the characteristics of two-dimensional materials. However, up to now, the cost of preparing nano-monolayer tungsten disulfide (WS₂) is still high, and more manufacturing schemes remain in the laboratory.

For example, some scholars have proposed a hydrothermal method to synthesize nano-single-layer tungsten disulfide. The specific steps include:

(1)Weigh 0.5635g thioacetamide in beaker, add 20 ml water, stir and dissolve, reserve.

(2)The solid tungsten hexachloride of 0.5950g was added to the solution mentioned above (1), stirred for one hour and placed in a 25 ml high-temperature reactor. The clean commercial carbon cloth was added and reacted in oven for 12 hours. The reaction temperature was 250 ℃. The product was taken out.

Among them, commercial carbon cloth is pretreated first, and the pretreatment operation is as follows:

Ultrasound cleaning was performed with ethanol for 15 minutes, then 0.759 g sodium tungstate was dissolved in 12 ml of 3M hydrochloric acid, then 2 ml 30% hydrogen peroxide was added to stir to clarify as seed liquid. The cleaned commercial carbon cloth was immersed in the above seed liquor, and the nuclei were grown at 350 C on the heating plate.

(3)Take out the carbon cloth, wash it with deionized water and absolute ethanol in turn, then put it in the oven at 60 C and dry it for 2 hours to get nano-monolayer tungsten disulfide, which shows a flaky structure.

WS₂ nano-electrode materials were synthesized directly on flexible carriers, which not only increased the specific surface area of electrode materials, but also effectively increased the performance of negative electrodes of supercapacitors. It can be applied to the assembly of flexible WS₂/MnO₂ asymmetric supercapacitors.

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