45 results about "Vanadium disulfide" patented technology

The invention discloses a preparation method and application of a rare earth doped vanadium disulfide electro-hydrogen evolution catalyst, and belongs to the technical field of electro-catalytic hydrogen production. According to the method, ammonium metavanadate is used as a precursor, thioacetamide is used as a sulfur source, rare earth chloride is used as a doping agent, and the rare earth doped VSpowder is prepared through a hydrothermal reaction under the assistance of polyvinylpyrrolidone. The obtained catalyst is of a flower-shaped nanosheet array structure, rare earth elements are evenly distributed in crystal lattices, the high conductivity of a 1T phase structure is kept, and the adsorption free energy of hydrogen atoms is optimized. Compared with an undoped VS, the catalyst shows lower overpotential and better reaction kinetics in a water electrolysis hydrogen evolution reaction, and the overpotential of a sample doped with 1.5% of Ce is as low as 150mV when the sample is-10mA. Cm. The method is simple in process and low in cost, and the obtained catalyst is high in stability, has wide application prospects and can be applied to the fields of hydrogen production through water electrolysis of new energy and the like.

The invention provides a preparation method of a vanadium disulfide nano hydrogenation catalyst. The preparation method comprises the following steps: dissolving a vanadium source in an aqueous solution to obtain a vanadium source precursor solution, and dissolving a sulfur source in an aqueous solution to obtain a sulfur source precursor solution; uniformly mixing the vanadium source precursor solution and the sulfur source precursor solution, adding an alkali solution to regulate the pH value of the solution to be alkaline, and preparing to obtain a vanadium disulfide precursor solution; and transferring the vanadium disulfide precursor solution into a container, heating and crystallizing, cooling, separating, washing, and drying to obtain the high active site exposed vanadium disulfide nano hydrogenation catalyst. The catalyst prepared by the invention is a pure 2H-phase vanadium disulfide catalyst which is formed by self-assembly of nanosheets and has a nano-rose morphology. The preparation method provided by the invention can solve the problem of small exposure of catalyst active sites in the hydrogenation catalyst, shows efficient catalytic hydrogenation performance, and expands the application range of vanadium disulfide in the field of catalytic hydrogenation.

The application discloses preparation of a core-shell structure hydrogel and application of the core-shell structure hydrogel in preparation of a magnetic control flexible micro robot, and belongs to the technical field of biomedical soft micro robot. The application adopts a core-shell structure to construct a hydrogel micro robot, wherein, a vanadium disulfide nanosheet rich in sulfur defects is used as a functional inner core, and has magnetic response and photoacoustic imaging capacity; a polyacrylamide polymer chain is used as a flexible outer shell, free radical initiation is carried out on the surface of the vanadium disulfide through vanadium-sulfur dynamic coordination bonds, and simple amide bond hydrogen bond crosslinking endows the hydrogel with three-dimensional printable performance. The prepared flexible micro robot can realize precise controllable movement under the action of an external magnetic field, and can realize robot posture monitoring and navigation positioning functions with the aid of photoacoustic imaging capacity, and has good application prospect in the fields of drug delivery, minimally invasive surgery and tissue treatment.

The application provides a graphite phase carbon nitride / vanadium disulfide / carbon nanotube ternary heterojunction composite material, and the photocatalyst is a layered nanosheet structure, which takes graphite phase carbon nitride as a skeleton, is doped with vanadium disulfide nanosheets and carbon nanotubes, and the graphite phase carbon nitride, the vanadium disulfide nanosheets and the carbon nanotubes are interwoven to form a heterojunction. The graphite phase carbon nitride, the vanadium disulfide and the carbon nanotube cooperate with each other to construct an efficient photocatalytic system, which can simultaneously drive oxidation (tetracycline hydrochloride degradation) and reduction (hydrogen peroxide generation) processes.

The invention discloses a preparation method of a carbon-modified vanadium disulfide nano material for oxidative removal of endocrine disrupters in a water body and application of the carbon-modified vanadium disulfide nano material to activation of persulfate. The preparation method comprises the following steps: firstly, using ammonium metavanadate as a vanadium source, thioacetamide as a sulfur source and L-ascorbic acid as a carbon source, and adjusting the pH value by using ammonia water; the molar ratio of ammonium metavanadate to thioacetamide to L-ascorbic acid is 1: 5: (1-5), and 2-4 mL of ammonia water is prepared into a precursor; the precursor is subjected to water bath ultrasonic treatment and then subjected to a hydrothermal reaction, washing and vacuum drying are conducted after the reaction is completed, and then the powdery carbon-modified vanadium disulfide is obtained. Compared with a single vanadium disulfide metal 1T phase, the carbon-modified vanadium disulfide nano material for oxidative removal of endocrine disrupters in a water body, prepared by the preparation method disclosed by the invention, is higher in composition, richer in microporous structure, higher in persulfate catalytic activation capability and reusability and lower in toxicity; under the same reaction condition, the degradation reaction rate constant is 4-79 times higher than that of common metal sulfide.