48results about How to "Improve the kinetic performance of hydrogen absorption and desorption" patented technology

The invention relates to a Ti-Cr-V solid solution alloy with high hydrogen storage capacity as well as low V content, which belongs to the new material field. The invention comprises a Ti element, a Cr element and a V element and is characterized in that the alloy is formed by the alloying of the a binary cluster Cr7Ti6 and the nearby composite by adding few V; the composite scope is (TiCry)(100 minus x)/(1 plus y)Vx, that is, V atom per centage scope x is equal to 2 minus 10at. per cent, and Cr/Ti atom per centage scope y is equal to 0.96 minus 1.44; the maximum hydrogen absorption capacity of the solid solution alloy Ti43.8Cr51.2V5 and Ti42.9Cr50V7.1 with maximum hydrogen uptake is 3.2wt. per cent (313K), which processes good hydriding and dehydriding kinetics performance; the solid solution alloy with low V content is processed by adopting the vacuum arc melting and the water-cooled copper mold method. The invention has the advantages that the invention defines the composite range of the low V content in accordance with the cluster, which overcomes the arbitrary composite selection. By adoption of the water-cooled copper mold method, the invention ensures the alloy is the V solid solution alloy structure with low V content, and simplies the process preparation; the invention is capable of replacing the solid solution alloy with V content, lowers the material cost and is capable of being used as fuel cell hydrogen source alloy.

The invention discloses a preparation method of a nano magnesium hydride loaded composite material, the preparation method comprises the following steps: adding a cationic surfactant into an aqueous dispersion of two-dimensional transition metal carbide to enable two-dimensional transition metal carbide nanosheets to wrinkle and avoid re-stacking, and then washing and drying; putting the dried product into a sealed container, vacuumizing the sealed container, raising the temperature to a high temperature, keeping the temperature for a period of time, filling high-pressure hydrogen into the sealed container, and keeping the temperature for a period of time; and finally, adding a product subjected to heat treatment and dibutyl magnesium into an organic solvent to obtain a mixture, carrying out ultrasonic dispersion, stirring and heating for 12-48 hours under the conditions that the hydrogen pressure is 3-6 MPa and the temperature is 180-220 DEG C, and carrying out centrifugal drying to obtain the nano magnesium hydride loaded composite material. The prepared two-dimensional transition metal carbide nano magnesium hydride loaded composite material has the advantages of high hydrogen storage density, rapid hydrogen absorption and desorption dynamic performance, excellent cycle stability and the like.

The invention relates to a manufacturing method of a corrugated rare earth hydrogen storage material, which comprises the following steps: grinding titanium oxide powder, boric oxide powder, niobium dioxide powder and rhenium oxide powder into powder with the particle size of 50-80 nanometers, weighing according to a ratio, blending, and fusing to obtain a material A for later use; weighing nano zinc oxide and nano magnesium oxide according to the formula, and mixing to obtain a material B for later use; and weighing polyvinyl chloride, activated carbon and titanium oxide powder according to the formula, blending, putting the mixture into a charging barrel of an extruder after blending is finished, heating and extruding a corrugated material, and then preparing the corrugated-structured rare earth hydrogen storage material after manufacturing and assembling. It is ensured that the rare earth hydrogen storage material can reversibly absorb, store and release a large amount of hydrogen in the normal-temperature state, safe use of hydrogen energy in power generation and combustion links is promoted, the use efficiency of green energy is improved, and meanwhile, the material has the advantages of being high in product yield, low in cost, easy and convenient to operate, long in service life, efficient, capable of saving energy and environmentally friendly, and has wide application value.

The invention provides magnesium-based hydrogen storage alloy containing a long-period ordered accumulation structure. The chemical molecular formula of the magnesium-based hydrogen storage alloy is Mg-aX-bY-cLi, X represents one of V or Co, a, b and c represent mass percentage, a is larger than or equal to 3% and smaller than or equal to 8%, b is larger than or equal to 17% and smaller than or equal to 19%, c is larger than or equal to 0.5% and smaller than or equal to 1% and the balance Mg. The preparation method of the magnesium-based hydrogen storage alloy mainly includes the steps that alloy particles containing the above ingredients are put into a ball milling tank, stainless steel grinding balls with the size being 4-6 mm are added into the ball milling tank according to the ball material ratio of (15:1)-(20:1), the rotation speed is 300-400 r/min, rotation is stopped for 10 minutes after operation is performed for 30 minutes, powder with the average particle size being 50-90 nm is obtained after ball milling is performed for 30-50 hours and placed into a vacuum high-temperature furnace, the power is heated to 200 DEG C under an argon gas atmosphere, heat preservation is performed for 24 hours, and the magnesium-based hydrogen storage alloy containing the long-period ordered accumulation structure is prepared. According to the process, equipment is simple and easy to control, the cost is low, the hydrogenation and dehydrogenation temperature of the prepared magnesium-based hydrogen storage alloy is moderate, and hydrogenation and dehydrogenation dynamics performance is good.