38results about How to "Fast hydrogen absorption and desorption rate" patented technology

The invention provides a method for improving a hydrogen storage property of lithium borohydride, and belongs to the technical field of hydrogen storage materials. The method comprises the following steps of: mixing the lithium borohydride and alkaline-earth metal alanate according to the molar ratio of 2:1-10:1 under the protection of vacuum or inert gases, and heating mixed powder of the lithium borohydride and the alkaline-earth metal alanate to a certain temperature to ensure that the alkaline-earth metal alanate is decomposed into alkaline-earth metal hydride, aluminum or aluminum alloy in advance. By the method, double effects of in situ and concerted catalysis in the process of discharging and absorbing hydrogen of the lithium borohydride by using the alkaline-earth metal alanate are achieved, so that a hydrogen discharging temperature of the lithium borohydride is greatly reduced, and the hydrogen absorbing and discharging dynamic properties of the lithium borohydride are improved. The method is suitable for storing the hydrogen safely and efficiently and is particularly applied in fields of hydrogen fuel cells and the like.

The invention provides a method for preparing a magnesium-silver hydrogen storage material and belongs to the technical field of hydrogen storage materials. The method comprises the following steps of: performing induction smelting of a magnesium-silver alloy which contains 75 to 80 molar percent of Mg and the balance of Ag, wherein 8 to 10wt% of burning loss of Mg is increased during smelting; and annealing the smelted alloy for 6 hours at the temperature of 300 DEG C, grinding into 100 meshes powder in a glove box, adding 5wt% of TiF3 into the powder, performing ball milling for 30 hours in a ball milling tank, thus obtaining the magnesium-silver hydrogen storage material. The method has the advantages that the raw materials and energy consumption are reduced, the preparation process is simple and consumes short time, the method is easy to control and the like; and the magnesium-silver hydrogen storage material prepared by the method has the characteristics of high hydrogen storage quantity, high hydrogen absorption and release rate, high cycle stability and the like.

The invention relates to a preparation method of an in-situ growth nano magnesium hydride loaded high specific surface material. An alkali metal hydride, magnesium halide and a support material are utilized for in situ synthesis of the material under a ball milling condition. The invention has the technical effects that: magnesium hydride is generated in situ on the support material surface through replacement reaction, the nano-composite hydrogen storage material with low operating temperature and fast hydrogen absorption and desorption rate is prepared under a mild condition, the problems of harsh preparation conditions, large product particle size and the like in previous nano magnesium hydride preparation, and the thermodynamic and dynamic performance of the magnesium hydride hydrogen storage material can be improved.

The invention relates to a nanometer catalysis composite nitride hydrogen storage material and a preparation method thereof; the nanometer catalysis composite nitride hydrogen storage material is characterized in that a precursor is decomposed in a nitride substrate to precipitate nanometer catalysis phase with high activity, so as to realize quick reversible hydrogen absorption and desorption; more particularly, the nitride hydrogen storage material is the nitride composite material system of alloying magnesium powders and LiNH2 nanometer phase which has catalysis effect is uniformly arranged in the LiNH2 substrate; the alloying magnesium powders is a multiple catalysis material system which is formed by Mg powder and transition elements such as Cr, Mn, Ti, Fe, Cu, Ni and Y or other mixtures. The preparation method is characterized in that the nitride hydrogen storage material with high hydrogen absorption and desorption rate is gained by a two-step method: high-pressure hydrogen atmoesphere reaction ball-grinding alloying and inertia gas protection ball-grinding compounding. The composite nitride hydrogen storage material with high hydrogen absorption and desorption rate can be gained by the preparation method of the invention.

The invention discloses a high-pressure composite metal hydride hydrogen storage tank and a hydrogen storage method thereof. The hydrogen storage tank comprises a base support and a hydrogen storage tank shell with an opening in the bottom, and the hydrogen storage tank shell is installed on the base support in a sealed and buckled mode. A hydrogen inlet and a hydrogen outlet are formed in the hydrogen storage tank shell. A hydrogen storage alloy storage space, a gaseous hydrogen storage gap and a circulating heat exchange system are arranged in the hydrogen storage tank shell. The hydrogen storage alloy storage space is filled with hydrogen storage alloy, and the circulating heat exchange system is used for absorbing heat when the hydrogen storage alloy absorbs hydrogen and heating the hydrogen storage alloy when the hydrogen storage alloy releases hydrogen. According to the high-pressure composite metal hydride hydrogen storage tank and the hydrogen storage method thereof, a gas hydrogen storage gap is formed in the hydrogen storage tank, the size of a reserved gap can be adjusted according to the requirement of hydrogen storage mass density, hydrogen storage of different mass densities is achieved, the advantages of high mass density of high-pressure gas hydrogen storage and high volume density of solid hydrogen storage are fully combined, and the volume of the solid hydrogen storage part is adjusted, the purpose of storing more hydrogen under equal pressure is achieved.

The invention relates to the field of hydrogen storage materials, in particular to a preparation method of a hydrogen storage material nano catalysis system. A catalyst nano particle is prepared by combining and applying an ion beam sputtering or magnetic control sputtering technology and a rebounding disk technology, a transition metal nano particle is prepared by adopting an ion beam sputtering or magnetic control sputtering transition metal target material, hydrogen storage material powder is driven by adopting the rebounding disk technology to make a multiple-dimensional and/or multiple-mode movement, and in-situ uniform surface phase compounding of the catalyst nano particle and the hydrogen storage material powder is realized. A device for preparing the hydrogen storage material nano catalysis system comprises a sputtering system, a nano particle/powder material composite system and a feeding/sampling system. The invention is suitable for preparing various hydrogen storage material nano catalysis systems. The hydrogen storage material nano catalysis system prepared by adopting the invention has hydrogen storage performance remarkably superior to the material prepared by adopting the traditional metal phase ball grinding method.

The invention relates to a magnesium-based composite hydrogen storage material. The magnesium-based composite hydrogen storage material is composed of Mg, Ni and Tm, wherein Tm is any one or two of Mn, Zr, Nb, Al and Ti; and the chemical components of the magnesium-based composite hydrogen storage material can be represented as Mg2Ni(1-x)Tmx, and x is larger than 0 and smaller than or equal to 0.3. According to the magnesium-based composite hydrogen storage material, Mg2Ni serves as the main phase, an intermetallic compound Mg3TmNi2 of a cubic structure is grown in the Mg2Ni matrix phase in situ, Mg accounting for 4-6% of the total weight is dispersed in alloy, Mg is firstly corroded and oxidized in a strong-basicity electrolyte to form dense Mg(OH)2 which covers the surface of the alloy, and corrosion of Mg2Ni is effectively lowered. The magnesium-based composite hydrogen storage material has good hydrogen absorption/desorption performance and strong base corrosion resistance, and has good application prospects in the aspects of a hydrogen storage device and a high-capacity nickel-hydrogen secondary battery. A preparation method of the magnesium-based composite hydrogen storage material is simple in process and low in requirement for equipment, and the economic cost is effectively reduced.

The invention relates to a nanocrystalline amorphous Mg-M-Y hydrogen storage alloy and a preparation method thereof. Specifically, the nanocrystalline amorphous magnesium-based hydrogen storage alloy is composed of three components, by weight, of 65-87% of Mg, 2-15% of Y and 4-23% of M; and the M is one of aluminum (Al), nickel (Ni), iron (Fe), cobalt (Co), manganese (Mn), vanadium (V), chromium (Cr), copper (Cu) or titanium (Ti). The preparation method of the nanocrystalline amorphous Mg-M-Y hydrogen storage alloy is that the nanocrystalline amorphous Mg-M-Y hydrogen storage alloy is directly obtained by adopting reaction ball mill under the hydrogen atmosphere. The process route is shortened, the material preparation efficiency is greatly improved, and by adoption of the obtained nanocrystalline amorphous Mg-M-Y alloy, the high hydrogen absorption and desorption speed rate and the hydrogen storage amount are achieved without activation.

The invention provides rare earth hydrogen storage alloy and a preparation method and application thereof. The preparation method comprises the following steps that type-A metal, type-B metal and rare earth metal are mixed and then sequentially subjected to smelting and vacuum suction casting to obtain an alloy bar; and the obtained alloy bar is subjected to surface modification to obtain the rare earth hydrogen storage alloy. According to the preparation method, through optimal design, vacuum suction casting and surface modification of all the components, the activation performance, the hydrogen absorption and desorption rate, the effective hydrogen desorption amount and the cycle stability of the alloy are remarkably improved; and the preparation method is simple in technological process, low in cost and beneficial to large-scale production, and has a good industrial application prospect.

The invention discloses an MgH2-BiVO4 hydrogen storage composite material which consists of MgH2 and BiVO4, wherein the content of the BiVO4 accounts for 10-40% of the total mass of the composite material. A preparation method of the hydrogen storage composite material comprises the following steps: in a glove box protected by argon, putting the MgH2 powder and the BiVO4 in a ball milling tank, and performing ball milling in the presence of 0.1-0.5MPa argon at a ball-material mass ratio of (15-35):1 and the revolving speed of 450-550r/min for 1-3 hours, wherein 15-25 minutes of intermittence is spaced between every two times of 20-45 minutes of ball milling; after the ball milling, naturally cooling to the room temperature so as to obtain the MgH2-BiVO4 hydrogen storage composite material. Under relatively low temperature, compared with the MgH2 without the addition of BiVO4, the hydrogen absorption rate and maximum hydrogen absorption amount of the hydrogen storage composite material are improved by more than one time; at the same time, the preparation method is simple, the preparation cost is low and the hydrogen storage composite material is suitable for industrialization-scale preparation.

A holding hydrogen alloy used for making metallic hydride air conditioning. The chemical formula is La0.6Nd0.4Ni4.8Mn0.2Cux(x=0.1-0.4). Release hydrogen dosage of it is 1.43wt% at common temperature. Decomposition pressure at 18íµ is between 1amp and 1.5amp. Hysteresis coefficient is 0.09-0.24. Rate of grade of parallel line is 0.05-0.1. Absorbing hydrogen dosage can reach 90% in 50-80s. Meanwhile, Releasing and absorbing hydrogen dosage dynamic property is improved.

The invention discloses a solid hydrogen storage and desorption device and method based on temperature feedback regulation. During hydrogen storage, cooling liquid is injected into a liquid guide pipe, the cooling liquid circularly flows in the liquid guide pipe through a pump, a hydrogen storage material in a hydrogen storage bed body is cooled, and meanwhile, hydrogen is filled into a hydrogen storage tank body; hydrogen enters the hydrogen storage tank body after being filtered, and hydrogen storage is achieved at low temperature; during hydrogen desorption, the temperature in the hydrogen storage material is collected through the wireless temperature sensor, the hydrogen desorption speed and the hydrogen desorption temperature are determined according to needs, the temperature and the flowing speed of liquid in the liquid guide pipe are determined, and heating hydrogen desorption is achieved.

The invention discloses a magnesium-based hydrogen storage alloy and a preparation method thereof. The magnesium-based hydrogen storage alloy is prepared from raw materials of Mg2Ni alloy powder and nickel-plated carbon nano-tubes, wherein the weight ratio of the Mg2Ni alloy powder to the nickel-plated carbon nano-tubes is 100:(0.5-1). The preparation method includes the steps that the Mg2Ni alloypowder and the nickel-plated carbon nano-tubes are subjected to high-current electron beam pulse surface radiation pretreatment, then mechanical alloying is carried out through planet ball-milling, finally, high-current electron beam pulse surface radiation treatment is carried out, and the magnesium-based hydrogen storage alloy is obtained. The poor hydrogen heat absorption and release and dynamics performance of the magnesium-based hydrogen storage alloy is effectively improved, the low-temperature hydrogen absorption and release performance of the magnesium-based hydrogen storage alloy isgreatly improved, the hydrogen absorption and release rate of the magnesium-based hydrogen storage alloy is effectively increased, and thus the magnesium-based hydrogen storage alloy has higher practical application value.

The invention relates to a magnesium nickel-petroleum coke activated carbon composite hydrogen storage material and a preparation method thereof, and belongs to the technical field of hydrogen storage alloy materials. The method comprises the following steps: 1, preparing petroleum coke activated carbon; 2, preparing Mg-Ni hydrogen storage alloy; and 3, loading the composite hydrogen storage material: 31) uniformly mixing the petroleum coke activated carbon prepared in the step 1 with the Mg-Ni hydrogen storage alloy prepared in the step 2, and then placing the mixture on a muffle furnace protected by an argon atmosphere for high-temperature sintering; 32) placing the sintered composite hydrogen storage material in a hydrogenation reactor for activating treatment; and (33) putting the activated composite hydrogen storage material into a tablet press, and extruding the composite hydrogen storage material into a cylindrical shape. The spherical cage effect can be generated by means of dense apertures and gaps of the petroleum coke activated carbon, discrete aggregation of the pulverized hydrogen storage alloy is efficiently limited, and the magnesium nickel-petroleum coke activated carbon composite hydrogen storage material has the advantages of being high in hydrogen storage capacity, high in hydrogen absorption and desorption rate, low in strain accumulation and the like.

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.