Preparation of Supercapacitor Electrode by Tungsten Disulfide-carbon Aerogel Material

Supercapacitors are new energy storage devices between traditional capacitors and secondary batteries that have developed rapidly in recent years. They have the advantages of both - higher energy density than conventional capacitors, and more than two The higher power density of the secondary battery has made it a widespread concern in the field of new energy vehicles.

The performance of supercapacitors is mainly limited by the electrode material and the electrolyte system, and in particular, the specific surface area and conductivity of the electrode material have a significant influence on the performance of the supercapacitor. As an effective active electrode material for supercapacitors, transition metal sulfide tungsten disulfide has become a subject of research. For example, a single layer of nanometer tungsten disulfide.

Researchers at home and abroad have shown that single-layer nano-sized tungsten disulfide has good catalytic activity, higher theoretical specific capacitance than carbon-based materials, and better ion conductivity than general oxides. However, the Faraday quasi-capacitor with transition metal sulphide as the electrode material has relatively poor cycle stability, which seriously damages the service life of the capacitor and affects the further application of the material in the energy field.

In the field of supercapacitors, the aerogel solution is the most promising electrode manufacturing solution. The main material of aerogel has always been carbon. Carbon gel has the characteristics of good electrical conductivity, large specific surface area and wide range of density variation. It is an ideal electrode material for the preparation of electric double layer capacitors, but the defects of carbon aerogels are The raw materials are expensive, the preparation process is complicated, the production cycle is long, and the scale production is difficult.

The preparation of the supercapacitor electrode by the tungsten disulfide-carbon aerogel composite material comprises the following steps:

(1) cleaning and drying the current collector foam nickel sheet;

(2) preparing a carbon aerogel by a sol-gel method;

The formaldehyde and m-diphenol are dissolved in 50-100 ml of double-distilled water according to a molar ratio of 2:1, and the pH is adjusted to 6.5-7.0 by ammonia water (containing ammonia 25%-28%) in a water bath at 85 °C. After reacting for 24 hours, the precipitate is obtained by centrifugation, and dried for use;

(3) taking 0.012 to 0.075 g of the carbon aerogel prepared in the step (2), ultrasonically dispersed in 20 to 30 mL of secondary distilled water to obtain a uniform carbon aerogel dispersion;

(4) The WS2 solid powder is ground in a ball mill for 2 to 4 hours, refluxed in 95% to 98% concentrated nitric acid at 85 to 95 ° C for 10 to 16 hours, washed with secondary distilled water until neutral, and dried overnight;

(5) taking 0.048 to 0.6 g of the WS2 treated in the step (4), ultrasonically dispersed in 20 to 30 mL of secondary distilled water to obtain a WS2 dispersion;

(6) The carbon aerogel dispersion prepared in the step (3) is slowly added dropwise to the WS2 dispersion obtained in the step (5), continuously stirred, and diluted to 70-90 mL with double distilled water, and continuously stirred for 0.5. ~3h, a mixed solution is obtained;

(7) transferring the mixed solution obtained in the step (6) to the hydrothermal reaction vessel, and immersing the spare foamed nickel sheet in the step (1) therein to carry out a hydrothermal reaction;

(8) After the step (7) of the hydrothermal reaction is completed, it is naturally cooled to room temperature, the nickel foam is taken out, washed, and vacuum dried to obtain a tungsten sulfide-carbon aerogel composite material.

The tungsten disulfide is compounded with a stable carbon aerogel, and under the template assist of the foamed nickel, its good electrochemical performance is achieved through synergistic action, but the only drawback is that the whole preparation process takes a little longer. Time is the moment of money, and research results need to be further advanced.

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