47results about How to "Improved hydrogen release performance" patented technology

The invention discloses a Pt/ZIF-67 composite used for catalyzing hydrolysis of ammonia borane for hydrogen production. The Pt/ZIF-67 composite is prepared by mixing chloroplatinic acid with a metal organic framework ZIF-67 and then carrying out one-step reduction. The structure of the Pt/ZIF-67 composite retains the frame structure of ZIF-67; the average size of Pt nanoparticles is 1-2 nm, the Ptnanoparticles are uniformly distributed, and no obvious Pt metal characteristic diffraction peak occurs according to XRD detection results. A preparation method comprises the following steps: step 1)preparation and activation of the ZIF-67; and step 2) loading of the Pt nanoparticles: adding the activated ZIF-67 into water for ultrasonic dispersion, adding chloroplatinic acid, and then adding anaqueous NaBH4 solution drop by drop, and subjecting a product to filtering, washing and drying. As the Pt/ZIF-67 composite is applied to catalysis of the hydrolysis of ammonia borane for hydrogen production, the turn over frequency (TOF) of a reaction rate reaches 70-100 mol H2 min<-1> Pt mol<-1>, and activation energy is 30-40 kJ mol<-1>. The synergistic effect of the ZIF-67 and the Pt nanoparticles brings in better catalytic performance. Therefore, the Pt/ZIF-67 composite has good application prospects in the field of hydrogen production.

The invention discloses nanometer TiF3 catalyzed high-volume hydrogen-storing alloy and a preparation method thereof. The compositions of the alloy are shown as the following: La2-xRExMg17-yNiy+100 wt% Co+z wt% TiF3, wherein 0.2<x<0.5, 1<y<3, 3<z<10, RE is at least one of rare earth elements neodymium, yttrium and samarium. The preparation method comprises: in the protection of inert gas, employing induction heating for melting, injecting fused alloy into a copper mold to obtain cylinder ingots; filling a quartz tube with the ingots, performing induction heating fusion, continuously spraying liquid alloy on the surface of a rotating water-cooling copper roller by a slit nozzle at the bottom of the quartz tube to obtain rapid-quenched alloy; and mixing fragmented alloy powder and cobalt powder, performing ball milling, adding trace TiF3 catalyst and continuing to perform ball milling to obtain the alloy powder. Through composition design and structure adjusting, the thermal stability of alloy hydride is reduced and the hydrogen adsorption/desorption capacity and the dynamic performances of the alloy are improved.

The invention relates to a material and technology for storing hydrogen, in particular to a novel metal ammonia borane compound hydrogen storage material and a preparation method thereof. The novel metal ammonia borane compound hydrogen storage material is prepared by taking the mixture of ammonia borane NH3BH3 and metal M or metal hydride NHy as an initial raw material and performing ball milling on the raw material in an inert protective atmosphere or a reactive hydrogen atmosphere. The molecular formula of the novel metal ammonia borane compound hydrogen storage material is MxNH(3-nx)BH3, wherein x is more than 0 and less than or equal to 1, and n is more than or equal to 1 and less than or equal to 3. The mole ratio of NH3BH3 to M or NHy in the phase composition of the raw material is 1-50:1. The preparation method provided by the invention has high efficiency and simple and easy operation. The novel metal ammonia borane compound hydrogen storage material provided by the invention has the advantages of high hydrogen storage capacity, low hydrogen production temperature, fast hydrogen production dynamics, no impurities, no gaseous pollutants and the like and has the application prospective of automobile-mounted hydrogen storage.

The invention relates to the field of hydrogen storage material and hydrogen production, in particular to a multi-level ammonia borane compound hydrogen storage material and preparation and composite hydrogen release method thereof. The mixture of ammonia borane NH3BH3 and multi-metal hydride M1Mm2nHx is used as the starting material, and the multi-level ammonia borane compound hydrogen storage material is prepared by ball milling or auxiliary heat treatment in an inertia protection atmosphere or reactive hydrogen atmosphere, wherein the molecular formula of the multi-level ammonia borane compound hydrogen storage material is M1mM2n(NH2BH3)x, wherein 0<m<=4, 0<n<=4 and 1<=x<=10; the starting material comprises the phases of NH3BH3 and M1mM2nHx at a molar ratio of (1-10):1. The multi-level ammonia borane hydrogen storage material provided by the invention has obvious advantages of relatively high hydrogen storage capacity, low hydrogen release temperature, no impurity gas pollutant and the like. The composite hydrogen release technology provided by the invention effectively integrates the synthesis reaction and decomposition reaction of the multi-level ammonia borane so that the hydrogen storage system can realize high-capacity and fast hydrogen release in a proper temperature, and has application prospect in vehicular hydrogen storage.

The invention provides a preparation method of a Ti3C2MXene composite hydrogen storage material. The preparation method comprises the following steps: step one, firstly stripping Ti3AlC2 through HF acid to form Ti3C2; step two, then obtaining Ti3C2/SnS through a hydrothermal reaction and high-temperature activation treatment; and step three, synthesizing a Ti3C2/SnS/MF composite material through an impregnation method, then using the Ti3C2/SnS/MF composite material to adsorb a tetrahydrofuran solution of PMMA-LiBH4 so as to form a PL/Ti3C2/SnS/MF composite material. The PL/Ti3C2/SnS/MF composite material synthesized by the simple method has good hydrogen desorption performance and certain hydrophobicity, the initial hydrogen desorption temperature of the PL/Ti3C2/SnS/MF composite materialis as low as 80 DEG C, the main hydrogen desorption temperature is 300 to 400 DEG C, the hydrogen desorption amount within 1 h at the temperature of 350 DEG C reaches 6.3wt%, and the hydrogen desorption performance of the PL/Ti3C2/SnS/MF composite material is higher than the hydrogen desorption performance of a PL/SnS/MF composite material, so that the hydrogen desorption performance of PMMA-LiBH4is improved through the synergism of Ti3C2 and the PL/SnS/MF hydrogen storage composite material.

The invention discloses a water bath heat exchange type hydrogen storage device for a hydrogen kinetic energy engine vehicle. The device comprises an alloy hydrogen storage tank, an outer shell, an inner shell, a heat exchange shell, a water bath circulation heat exchange mechanism, a door sealing mechanism, a driving mechanism and a sealing cover. A plurality of long-strip-shaped heat exchange pieces are fixed to the outer wall of the alloy hydrogen storage tank in the circumferential direction, and the length direction of the heat exchange pieces is the same as the axis direction of the alloy hydrogen storage tank; a hydrogen storage chamber and an air cooling chamber are arranged in the outer shell; the inner shell is fixedly mounted in the hydrogen storage chamber; the heat exchange shell is internally provided with a plurality of heat exchange cavities which are communicated with one another, and the alloy hydrogen storage tank is installed in the heat exchange cavities. The alloyhydrogen storage tank is cooled and subjected to heat exchange during hydrogen filling in a circulating water cooling mode, and the heat dissipation rate and the hydrogen absorption rate of the hydrogen storage tank are increased; the alloy hydrogen storage tank is subjected to water bath heating during hydrogen desorption, the heat absorption rate and the hydrogen desorption rate of the alloy hydrogen storage tank are increased, uniform heat exchange is guaranteed, and the energy efficiency and the output power of the whole hydrogen kinetic energy engine system can be improved.

The invention provides a hydrogen fuel cell power-assisted bicycle. The bicycle comprises a power system and a frame, the power system comprises a hydrogen storage tank, a fuel cell device, a controldevice and a driving device; the frame specifically comprises a cross beam and a main vertical pipe, the rear end of the cross beam is connected with the main vertical pipe, the cross beam and the main vertical pipe are hollow, the rear end of the cross beam is provided with a ventilation opening communicating with the cross beam and the inner space of the main vertical pipe, and the side wall ofthe cross beam close to the front end of the cross beam is provided with an air outlet. The hydrogen storage tank is arranged in the cross beam, the fuel cell stack is arranged in the main vertical pipe, and an air outlet of the fuel cell stack is communicated with the ventilation opening, so that hot air exhausted by the fuel cell stack enters the cross beam through the ventilation opening and isexhausted from the air outlet after flowing through the outer surface of the hydrogen storage tank. Waste heat generated during operation of the fuel cell stack is utilized to realize thermal self-compensation.

The invention discloses a magnesium hydride/metal phthalocyanine hydrogen storage composite material and a preparation method thereof. The hydrogen storage composite material is formed by using a metal phthalocyanine compound MePc as an additive and performing high-energy ball milling compounding on the metal phthalocyanine compound and magnesium hydride MgH2; the metal phthalocyanine compound isselected from one or two kinds of materials from FePc (iron phthalocyanine), CoPc (cobalt phthalocyanine), NiPc (nickel phthalocyanine) and the like. The preparation method is mainly characterized inthat metal phthalocyanine MePc and magnesium hydride MgH2 are mixed according to a proportion of 10:100-20:100; the mixture is subjected to ball milling by a high-energy ball milling method under theinert gas protection or hydrogen atmosphere condition; the rotating speed of a ball grinding mill is 800 to 1000r/min; the ball material ratio is 30:1-50:1; the ball grinding time is 2 to 4h; after each ball grinding is performed for 0.5 to 1h, the ball grinding mill stops for 15 to 30min. The obtained magnesium hydride/metal phthalocyanine hydrogen storage composite material has the advantages that the unique high catalytic activity of metal phthalocyanine compound MePc is utilized; the initial hydrogen release temperature of magnesium hydride MgH2 is greatly reduced; the preparation processand the equipment are simple; the energy consumption is low; the cost is low; ideal application prospects are realized.

The invention discloses a magnesium hydride hydrogen storage material based on graded porous microspheres Ti-Nb-O. The magnesium hydride hydrogen storage material is prepared by mixing and mechanically ball-milling magnesium hydride and graded porous microspheres Ti-Nb-O, the graded porous microspheres Ti-Nb-O are prepared by a solvothermal method and a calcining method; the diameter is 1-2 [mu] m, the microstructure is spherical, the specific surface area is 27.63 m < 2 >/g, and the pore size distribution is 38-40 nm. The preparation method comprises the following steps: 1, preparing a hierarchical porous microsphere Ti-Nb-O precursor; 2, preparation of a graded porous microsphere Ti-Nb-O; and 3, preparing the magnesium hydride hydrogen storage material based on the graded porous microspheres Ti-Nb-O. As the application in the field of hydrogen storage, the initial hydrogen desorption temperature of the system is reduced to 189 DEG C, and the hydrogen desorption amount reaches 6.96 wt%; the isothermal complete hydrogen desorption temperature is 300 DEG C, and the hydrogen desorption amount within 60 min reaches 6.82 wt%; and under the condition that the isothermal hydrogen absorption temperature is 50 DEG C, 1.78 wt% of hydrogen is absorbed within 60 min. The activation energy of catalytic hydrogen desorption is Ea (des) = 92.7 kJ/mol, and the activation energy of catalytic hydrogen absorption is Ea (abs) = 26.0 kJ/mol; the desorption reaction enthalpy change Hd is equal to 69.6 kJ/mol. And the cycle retention rate is 92.3%.

The invention discloses an ammonia borane/magnesium hydride/heat conduction agent compound hydrogen storage material. The material is composed of magnesium hydride, a heat conduction agent, and ammonia borane subjected to partial phase change after being placed at room temperature for six months or more or thermally treated for 10-30 min, wherein the molar ratio of ammonia borane to magnesium hydride is 2:(0.8-1), and the mass of the heat conduction agent is 5-30 wt% of the sum of the mass of ammonia borane and that of magnesium hydride. The invention further provides preparing and hydrogen desorption methods of the compound hydrogen storage material. Through combination of component optimization and hydrogen desorption condition control, high-capacity hydrogen desorption of the compound hydrogen storage material under the low-temperature condition is well achieved, and then application requirements are met. Commercial application in the fields such as hydrogen refueling stations, hydrogen cell automobiles and mobile hydrogen sources can be achieved. Therefore, the ammonia borane/magnesium hydride/heat conduction agent compound hydrogen storage material has high practical value and popularization value.

A Mg2NiH4 material and a preparing method thereof are disclosed. The Mg2NiH4 material is a Mg2NiH4 material having an orthogonal structure at room temperature. The method includes firstly subjecting Mg2Ni alloy powder obtained by smelting to ball milling treatment, adding the alloy powder into a reaction kettle, feeding hydrogen into the reaction kettle, heating the reaction kettle to a certain temperature, then maintaining the temperature, vacuumizing the reaction kettle with the temperature of the reaction kettle unchanged, repeating ball milling and hydrogen absorption steps, and finally cooling the reaction kettle to room temperature to obtain a Mg2NiH4 powder material. An embodiment of the method achieves controllable generation of the Mg2NiH4 only having the orthogonal structure, andthe prepared Mg2NiH4 material having the orthogonal structure shows a ferromagnetic property so as to allow application of Mg2NiH4 as a magnetic material to be possible, and has excellent hydrogen release performance. The Mg2NiH4 having the single structure that is adopted as a hydrogen storage alloy has a wide application prospect in the field of magnetic materials.

The invention discloses a preparation method for a two-dimensional supported nanometer magnesium hydride hydrogen storage material. The preparation method comprises the following steps of (1) by taking a magnesium metal-contained organic compound and graphene as raw materials, under argon shield, performing ball milling at a room temperature and a hydrogen atmosphere, and performing hydrogenationon the magnesium metal-contained organic compound to obtain suspension liquid of graphene supported magnesium hydride as a reaction product; and (2) performing suction filtration and drying on the obtained reaction product to obtain the two-dimensional supported nanometer magnesium hydride hydrogen storage material. The preparation method provided by the invention has the advantages of reduced cost, simplified synthetic method, simple technological process, high production efficiency, low energy consumption, high process safety and relatively large yield; and in addition, the two-dimensional supported nanometer magnesium hydride prepared by the preparation method has high hydrogen storage capacity and excellent cycling stability, has very large potential on the aspects of hydrogen storageand conveying, fuel cells and the like and is a hydrogen storage material with great application prospect.