141 results about "Hydrogen desorption" patented technology

The invention relates to the field of solid hydrogen storage, in particular to a nanocrystalline vanadium-based hydrogen storage material as well as a preparation method and application thereof. The invention provides a method for simply preparing a nanocrystalline vanadium-based hydrogen storage material by a mechanical alloying method, and the preparation method comprises the following steps: 1, crushing vanadium: carrying out vacuum heat treatment on a vanadium block, and adding hydrogen pressure at room temperature to carry out hydrogenation crushing treatment; and 2, in an inert atmosphere, carrying out mixing and ball-milling reaction with an oxide to prepare the nanocrystalline vanadium-based hydrogen storage material. The nanocrystalline vanadium-based material is directly prepared in a ball milling mode, the preparation process and operation are simple, the production period is short, energy consumption is low, and the method is suitable for large-scale production. The nanocrystalline vanadium-based material only contains vanadium and hydrogen, the reversible hydrogen storage capacity is 1.6 wt% at the temperature of 50 DEG C, the hydrogen desorption platform pressure is 6.3 bar, and the capacity retention rate is 96% after 10 times of hydrogen absorption and desorption cycles at the temperature of 30 DEG C.

The invention relates to the technical field of purification, and discloses a hydrogen purification method based on a magnesium-based solid hydrogen storage material, which comprises the following steps: S11, packaging the magnesium-based solid hydrogen storage material into a plurality of purification units, connecting the two purification units in parallel, and arranging a thermal interaction unit between the two parallel purification units to form a primary purification module; and S2, purification: introducing the low-purity hydrogen into the purification module, so that the low-purity hydrogen is respectively subjected to a hydrogen absorption reaction and a hydrogen desorption reaction for multiple times in the purification units connected in parallel, the low-purity hydrogen is purified, heat is supplied to the purification units which are subjected to the hydrogen desorption reaction through the heat interaction unit, and heat energy released by the hydrogen absorption reaction is stored. Based on the selective adsorption capacity of the solid hydrogen storage material to hydrogen, the solid hydrogen storage material is used for adsorbing hydrogen and discharging impurity gas, so that the purity of hydrogen is improved, and the heat interaction unit is used for storing heat energy released by a hydrogen absorption reaction and applying the heat energy to a hydrogen desorption reaction, so that the energy consumption in the purification process is reduced.

The invention relates to a Y-doped Ti-Mn-based solid hydrogen storage alloy and a preparation method thereof, belongs to the technical field of hydrogen storage alloy materials, and has the advantages of easiness in activation, high hydrogen absorption and desorption speed, moderate hydrogen absorption and desorption plateau pressure and long cycle life. The invention provides a Y-doped Ti-Mn-based hydrogen storage alloy, which is characterized in that the chemical general formula of the hydrogen storage alloy is Ti1-x-yYxZryMn2-w-vVwFev, in the formula, x, y, w and v represent atomic ratios, 0.02 < = x < = 0.08, 0.05 < = y < = 0.15, 0.3 < = w < = 0.5, and 0.1 < = v < = 0.2. The hydrogen storage alloy is excellent in hydrogen storage performance and can be completely activated by absorbing hydrogen for the first time under the conditions of 25 DEG C and 3 MPa, the hydrogen storage capacity is larger than or equal to 1.90 wt%, the hydrogen absorption plateau pressure is larger than or equal to 0.35 MPa, the hydrogen desorption plateau pressure is smaller than or equal to 0.26 MPa, and the hydrogen absorption retention rate of the alloy is larger than or equal to 97.52% after the alloy is cycled for 1000 times.

The invention belongs to the technical field of hydrogen storage, and particularly relates to a vehicle-mounted hydrogen storage device and a hydrogen absorption and desorption method thereof. A vehicle-mounted hydrogen storage device comprises a hydrogen storage reactor arranged in a vehicle-mounted high-pressure container and filled with vanadium-based hydrogen storage alloy; the refrigerating system is used for providing a first fluid medium for the solid hydrogen storage reactor in a hydrogen absorption process so as to cool the hydrogen storage reactor to a preset hydrogen absorption temperature; the heating system is connected with a waste heat source of a vehicle-mounted engine and used for providing a second fluid medium for the hydrogen storage reactor in the hydrogen desorption process so as to heat the hydrogen storage reactor to the preset hydrogen desorption temperature; and the fluid conveying loop comprises a pipeline and a valve and is used for selectively communicating the refrigerating system or the heating system with the hydrogen storage reactor so as to convey the first fluid medium or the second fluid medium.

The invention relates to a solid hydrogen storage bottle with an internal heat exchange coupling heat pipe, which comprises a bottle body, a heat conduction part and a gas guide part, the heat conduction part is movably arranged in the bottle body, and a material storage cavity is formed in the bottle body; the air guide part keeps the material storage cavity communicated with the outside of the bottle body in the moving process; wherein the gas guide part synchronously moves along with the heat conduction part, and the heat conduction part keeps the hydrogen absorption material deviating from the gas guide part in the static process. The heat conduction part is movably arranged in the bottle body, so that when the heat conduction part moves, the hydrogen absorption material is thrown away from the gas guide part, the material cannot escape outwards, smooth flowing of hydrogen is kept, the number of the storage cavities is not limited by the structure, the multiple storage cavities can be arranged, the hydrogen absorption material is fully separated, and the hydrogen absorption effect is improved. And the whole structure keeps a good heat conduction effect on the hydrogen absorption material, and meanwhile, sufficient flow of hydrogen between the inside and the outside is ensured, so that the hydrogen absorption and hydrogen desorption efficiency is effectively ensured.

The utility model discloses a hydrogen storage and supply device and a hydrogen fuel cell heat and power cogeneration system, and relates to the technical field of fuel cells. The hydrogen storage and supply device realizes normal-temperature and normal-pressure storage of hydrogen on the basis of a liquid organic matter hydrogen storage technology, and the principle is that hydrogen storage is realized by virtue of reversible reaction and hydrogenation reaction of unsaturated liquid organic matters such as olefin, alkyne or aromatic hydrocarbon and hydrogen, and hydrogen release is realized by virtue of dehydrogenation reaction. According to the liquid organic matter hydrogen storage technology, the hydrogen storage density is 5%-10%, and the hydrogen storage amount is large; and the hydrogen storage carrier is a liquid organic matter, normal-temperature and normal-pressure transportation can be achieved, convenience and safety are achieved, the requirement for the hydrogen liquid tank is low, and hydrogen leakage is basically avoided during transportation. And during dehydrogenation reaction, the temperature required by hydrogen desorption is low, the energy consumption is low, the hydrogen desorption rate is adjustable, and the hydrogen desorption device can be adapted to various hydrogen fuel cells. The hydrogen fuel cell heat and power cogeneration system collects and utilizes the lost heat of the cell, so that the comprehensive utilization rate of the hydrogen fuel cell is improved.

The invention discloses a magnesium-based solid hydrogen storage tank integrated with a resistance heating and electromagnetic coupling magnetic field structure, which comprises a tank body and a control cabinet integrated on the outer side wall of the tank body, a plurality of electrode plates are arranged in the tank body, and the electrode plates are electrically connected with a power supply cabinet on the side wall of the tank body through tabs on the electrode plates. The inner space of the tank body is divided into a plurality of hydrogen storage spaces by the plurality of electrode plates, magnesium-based solid hydrogen storage materials containing magnetic alloy metal and carbon materials are added into the hydrogen storage spaces through material adding ports formed in the outer side wall of the tank body, a temperature sensor is arranged in each hydrogen storage space, and a pressure sensor is arranged at the top of the tank body; a hydrogen inlet / outlet is formed in the top end of the tank body; a communicating hole for communicating two adjacent hydrogen storage spaces is formed in the center of the electrode plate. Through the synergistic effect of an electric field and a magnetic field, the thermal management performance of the magnesium-based hydrogen storage material is effectively improved, the hydrogen desorption cold start time is shortened, the thermal effect influence in the hydrogen charging and desorption process is reduced, stress concentration caused by volume expansion is relieved, and the hydrogen storage and release performance of the magnesium-based material is improved.

The invention discloses a hydrogen trap characteristic parameter determination method based on a genetic algorithm, and relates to the technical field of hydrogen trap characteristic calculation. Placing the sample in a hydrogen filling device for hydrogen filling treatment, wherein the hydrogen concentration in the sample is saturated; transferring the sample into a heating thermal desorption device for hydrogen desorption treatment, collecting overflowed hydrogen through a mass spectrometer to obtain an actually measured TDS curve, and analyzing the category number of hydrogen traps in the material; according to the McNabb and Foster theories, in combination with an Oriani hypothesis, a calculated TDS curve is obtained; establishing an error function between the actually measured TDS curve and the calculated TDS curve; and according to the error function, a genetic algorithm is adopted to invert and solve the concentration and binding energy of various hydrogen traps. The method can accurately predict the concentration of various hydrogen traps in the material and the characteristic parameters of binding energy, and provides technical support for hydrogen embrittlement prevention design, safety evaluation and the like of steel for hydrogen energy storage and transportation equipment.

The invention provides an extended-range solid hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system, which comprises a proton exchange membrane hydrogen fuel cell power generation module used for converting hydrogen and oxygen into electric energy through electrochemical reaction; the alloy solid hydrogen storage and supply module is used for storing hydrogen in a low-pressure safe and high-density manner, releasing heat during hydrogen charging and exchanging heat with external cooling fluid; heat is absorbed during hydrogen desorption and exchanges heat with waste heat of the hydrogen fuel cell, so that hydrogen-heat coupling in the hydrogen supply process is realized; and the hydrogen thermal coupling thermal management module is used for transferring waste heat of the fuel cell to the solid hydrogen storage device so as to support the hydrogen desorption and heat absorption process of the solid hydrogen storage device. The technical problem of alloy solid hydrogen storage in hydrogen supply stability is solved, gas hydrogen can be stably and rapidly supplied to a fuel cell under the working conditions of vehicle starting, climbing or rapid power increasing and the like, power output stability of a system is maintained, and the strict requirement of the traffic power field for power performance is met.

The invention relates to a hydrogen ore carrier gas-solid two-phase conversion method which is suitable for a gas-solid two-phase conversion device containing a hydrogenation container and a hydrogen desorption container. The hydrogenation container is provided with a first heat preservation container and a first pipe group and is provided with a feeding port and a discharging port; the hydrogen releasing container comprises a second heat preservation container, a second pipe set, a feeding port, a discharging port and a hydrogen collecting pipeline. The method comprises the following steps: placing a solid hydrogen storage carrier to be loaded in a hydrogenation container, heating, introducing hydrogen, and introducing cooling water after complete absorption; and putting the full-load solid hydrogen storage carrier into a hydrogen releasing container, heating to promote the hydrogen to be discharged, releasing the hydrogen after the hydrogen is completely discharged, and introducing cooling water to complete conversion. Accurate temperature control is realized by adopting rapid heating of superheated steam and timely cooling of cold circulating water; and the heat source is adaptive to various hydrogen storage carriers. Hydrogenation and hydrogen desorption are carried out in different containers, cross contamination is prevented, and efficient process is guaranteed. The metal small-particle hydrogen storage carrier is large in specific surface area, and the hydrogen storage efficiency is improved. A steam heat source is quick in heat transfer, good in temperature control, shortened in reaction period and beneficial to industrial application.

The invention relates to a Ti-Fe-Ce-Mn-Zr-Al-Co-based hydrogen storage alloy and a preparation method thereof, belongs to the technical field of hydrogen storage alloy materials, and solves at least one of the problems of high activation condition, long activation period, poor hydrogen absorption and desorption performance and the like of the traditional TiFe hydrogen storage alloy in the prior art. The invention provides a Ti-Fe-Ce-Mn-Zr-Al-Co-based hydrogen storage alloy which is characterized in that the specific composition of the alloy is Ti < 1.05 > Ce < 0.05 > Fe < 1.15-x-y-z-m > Mn < x > Zr < y > Al < z > Com, x, y, z and m are atomic ratios, x is larger than or equal to 0.1 and smaller than or equal to 0.25, y is larger than or equal to 0.05 and smaller than or equal to 0.2, z is larger than or equal to 0.02 and smaller than or equal to 0.1, and m is larger than or equal to 0.02 and smaller than or equal to 0.1. The hydrogen storage alloy has good activation performance and hydrogen absorption and desorption performance, the hydrogen storage capacity is larger than or equal to 1.70 wt.%, the hydrogen absorption plateau pressure is larger than or equal to 0.41 MPa, and the hydrogen desorption plateau pressure is larger than or equal to 0.31 MPa; activation can be completed at a time under the conditions that the temperature is 30 DEG C and the initial hydrogen pressure is 3 MPa, and the solid hydrogen storage material can be widely applied to hydrogen fuel cells and other scenes as a solid hydrogen storage material.

The utility model provides a solid hydrogen storage system, which comprises a hydrogen storage module, a waste heat recovery module and a waste heat export module, and the hydrogen storage module is respectively connected with a hydrogen source and a user side and is used for storing and releasing hydrogen; the waste heat recovery module is connected to the hydrogen storage module and can recover heat released in the hydrogen filling stage and store the heat through a heat storage working medium. The waste heat leading-out module is connected to the waste heat recovery module, heat stored by the waste heat recovery module is released and utilized, the waste heat leading-out module can be connected with the hydrogen storage module to serve as a heat source in the hydrogen desorption stage, and the waste heat leading-out module can also be connected with other systems with heat energy requirements. Waste heat in the hydrogen charging process is recycled, energy waste is avoided, efficient utilization of energy is achieved through system circulation, the conversion efficiency of a fuel cell can be fully exerted, good market applicability is achieved, the stored waste heat can serve as a heat source to be used for various ways, and the system is simple in overall structure, low in cost, high in practicability and suitable for popularization and application. The application range is wide.

The invention discloses a template agent P123-based 3DNSi / Nb-O composite material, niobium oxalate is used as a niobium source, ammonium fluotitanate is used as a titanium source and a fluorine ion regulator, boric acid is used as the fluorine ion regulator, and P123 is used as a template agent, and the preparation method comprises the following steps: firstly, preparing 3DNSi / Nb-O through a hydrothermal method, and then carrying out heat treatment to remove P123. The 3DNSi / Nb-O is anatase type TiO2, and the Nb element is doped into a TiO2 crystal lattice; the oxygen vacancy microstructure is of a three-dimensional structure composed of nanosheets; and the specific surface area is 25-35 m < 2 > / g. The niobium source is niobium oxalate; the titanium source is ammonium fluotitanate; the fluorine ion regulator is boric acid, and in addition, the ammonium fluotitanate is also the fluorine ion regulator; the template agent is P123. The invention discloses a magnesium hydride composite hydrogen storage material based on 3DNSi / Nb-O and a preparation method of the magnesium hydride composite hydrogen storage material. The initial hydrogen desorption temperature of the obtained MH-3DNSi / Nb-O is 185-230 DEG C; the hydrogen desorption amount is 6.0 to 6.5 weight percent; when the number of times of hydrogen absorption and desorption is 1000-1500, the hydrogen storage capacity is not obvious, and the hydrogen desorption capacity is kept at 6.9-7.1 wt.%.

The invention discloses a hydrogen desorption system and method of a magnesium-based solid hydrogen storage reaction kettle, a hydrogen storage tank is placed in each placement position in an inner cavity of the reaction kettle, and each placement position is provided with a heat exchange coil pipe; the hydrogen desorption system comprises a hydrogen desorption part, a temperature control part and a safety protection part; the hydrogen desorption part comprises a hydrogen desorption main pipeline, a hydrogen desorption automatic switch valve is arranged on the hydrogen desorption main pipeline, and a vacuumizing pipeline is connected to the hydrogen desorption main pipeline in parallel; the temperature control part comprises an external heat-conducting oil circulating system, a flow bypass pipeline is arranged between the oil inlet pipeline and the oil return pipeline in a crossing manner, and a heat-conducting oil shunting automatic switch valve is arranged on the flow bypass pipeline; the safety protection part comprises a reaction kettle safety valve arranged on the reaction kettle, the reaction kettle safety valve is externally connected with an emptying pipeline, a pressure relief bypass pipeline is arranged between the emptying pipeline and the hydrogen desorption main pipeline in a crossing mode, and an automatic opening and closing pressure relief valve is arranged on the pressure relief bypass pipeline. The reaction kettle has the advantages that rapid and efficient hydrogen desorption of a plurality of hydrogen storage tanks in the reaction kettle is realized, and the system safety is ensured.

The invention discloses a La-containing high-entropy alloy and a preparation method thereof.The preparation method comprises the steps that smelting is conducted according to the molar ratio of Ti to Mn to Fe to Co to Ni to La being 1: 1: 1: 1: 1: 0.1, and the mass of La is additionally increased by 3 wt% of burning loss mass; meanwhile, a CoFe phase, a NiTi phase and a FeNi phase are included; and the particle size is 100-200 meshes. The invention relates to a preparation method of a magnesium hydride hydrogen storage material based on a La-containing high-entropy alloy. The preparation method comprises the step of carrying out ball milling on HEA-La and MgH2. The obtained magnesium hydride hydrogen storage material based on the La-containing high-entropy alloy is applied to the field of hydrogen storage, when the doping amount of a catalyst is 10 wt%, the initial hydrogen desorption temperature is reduced to 179.44-180.33 DEG C, and the hydrogen desorption amount reaches 6.46-6.45 wt%; under the conditions that the dehydrogenation temperature is 300 DEG C and the dehydrogenation time is 30 minutes, the hydrogen desorption amount is 6.17-6.78 wt%; under the conditions that the hydrogen pressure is 3 Mpa, the hydrogen absorption temperature is 170 DEG C and the hydrogen absorption time is 5 min, the hydrogen absorption amount is 5.23-5.24 wt%.

Provided is a manufacturing method by which a rare-earth magnet powder having high magnetic properties can be efficiently obtained. This method for manufacturing a rare-earth magnet powder comprises: a hydrogen decrepitation step for obtaining a magnet raw material by introducing hydrogen after heating a cast alloy; a disproportionation step for causing a disproportionation reaction by allowing the magnet raw material to absorb hydrogen; and a recombination step for causing a recombination reaction by desorbing hydrogen from the magnet raw material after the disproportionation step. The recombination step includes: a controlled exhaust step for performing hydrogen desorption in an atmosphere having a large hydrogen partial pressure; and a forced exhaust step for performing hydrogen desorption in an atmosphere having a hydrogen partial pressure smaller than that of the controlled exhaust step. In the manufacturing method of the present invention, the magnet raw material after the controlled exhaust step is disintegrated or pulverized prior to the forced exhaust step. In this way, polycrystallization involving the connection of single crystals having different easy axis directions is suppressed, thereby improving the magnetic properties (particularly Br) of the magnet powder.

The application discloses a kind of catalyst doped magnesium-based hydrogen storage materials and preparation method thereof, belong to hydrogen storage material and its preparation technical field.The application improves the hydrogen absorption and desorption kinetics of existing magnesium-based hydrogen storage material, reduces its hydrogen desorption activation energy, and solves the problem of poor cycle stability.The application uses Cu (NO3) 2·H2O and H3BTC raw materials to prepare catalyst with porous structure, and dopes it in magnesium-based hydrogen storage material by ball milling technology, utilizes the porous structure of catalyst to avoid the agglomeration of active material during hydrogen absorption and desorption process, and the introduced metal can be used as catalytic site to improve the hydrogen absorption and desorption kinetics of magnesium-based hydrogen storage material Mg 85 Ni 10 La 4.5 Y 0.5 Desorption activation energy.

The invention relates to an RE-Mg-Ni-based hydrogen storage alloy containing double rare earth elements and a preparation method of the RE-Mg-Ni-based hydrogen storage alloy, belongs to the technical field of solid hydrogen storage alloy materials, and solves at least one of the problems that an existing Mg-based hydrogen storage alloy hydride is high in hydrogen desorption activation energy, slow in hydrogen absorption and desorption dynamics and low in hydrogen storage capacity. The chemical formula of the hydrogen storage alloy is Mg96-xLa4-yYyNix, x is greater than or equal to 2 and less than or equal to 6, and y is greater than or equal to 1 and less than or equal to 3; the grain size of the hydrogen storage alloy is 0.81-1.69 [mu] m, and the volume fraction of a precipitated phase is 20-40%. The elements La, Ni and Y are adopted to replace the element Mg, the grain size is refined, the crystal defect of alloy particles is improved, the phase structure is improved, the hydrogen desorption enthalpy change and the hydrogen absorption and desorption temperature are reduced, and the hydrogen absorption and desorption rate is increased; the alloy ingot is subjected to rapid quenching and recrystallization annealing treatment, so that the alloy grain structure is further refined, precipitation and uniform distribution of a phase state are promoted, more channels and nucleation sites are provided for hydrogen atoms to enter the alloy, the hydrogen absorption and desorption rate is increased, and the alloy hydride activation energy is further reduced.

This invention provides a catalyst for hydrogen storage materials, its preparation method, and its application. The catalyst comprises CeO2 nanorods and transition metal nanoclusters supported on the CeO2 nanorods; the transition metal nanoclusters include any two of Ni, Pd, Co, or Mn elements. In this catalyst, the CeO2 nanorods can form a strong metal-support interaction with the transition metal nanoclusters, synergistically improving the hydrogen storage kinetics of MgH2 material. Simultaneously, the transition metal nanoclusters containing two of the aforementioned elements can effectively improve the hydrogen absorption / desorption performance of MgH2. Therefore, by combining this catalyst with MgH2 material, the hydrogen desorption temperature of MgH2 can be reduced, the hydrogen absorption / desorption kinetics of MgH2 can be improved, and the cycling performance can be enhanced.

The invention discloses a vehicle-mounted high-mass-density hydrogen storage device and application thereof, tubular reactors are filled with hydrogen storage materials with weak adsorption effects to form tubular hydrogen storage units, and a plurality of tubular reactors are arranged in parallel to form the high-mass-density hydrogen storage device; meanwhile, the tubular reactor serves as a tube pass, an outer shell of the hydrogen storage device serves as a shell pass, a heat exchange medium is guided into the shell pass, so that the hydrogen storage module is located in a set and uniform temperature field, heat management in the hydrogen absorption / desorption process is enhanced, and stable hydrogen storage and supply are achieved. The method effectively reduces the bed temperature difference and the heat management burden by using the high mass density hydrogen storage potential of the weak adsorption effect hydrogen storage material and the characteristic of relatively mild heat effect brought by lower enthalpy change, and reduces the heat and mass transfer resistance of the bed by combining the material forming and filling and heat conduction enhancing modes, thereby improving the heat transfer efficiency. Stable hydrogen storage and supply under low-temperature hydrogen absorption and medium-temperature hydrogen desorption windows are achieved, the structure is compact, modular capacity expansion can be achieved, maintenance is convenient, and the vehicle-mounted hydrogen storage and supply device is suitable for vehicle-mounted hydrogen supply scenes.

The invention provides a resistance self-heating type solid hydrogen storage reactor, which belongs to the technical field of hydrogen energy storage and comprises a solid hydrogen storage component, a heat management component and an electric heating component. The porous solid hydrogen storage material is a magnesium-based composite material doped with coal ash and slag, has a porous structure and intrinsic conductivity, and realizes rapid and uniform spontaneous heating through a Joule effect; the heat exchange plates and the hydrogen storage materials are alternately distributed, a circulating pump drives a heat exchange medium and a phase change material storage tank to form closed-loop heat management, and heat recovery in the hydrogen storage stage and heat supply in the hydrogen desorption stage are achieved; the electric heating unit supplements Joule heat through an external power supply, and the operation state is controlled in real time in combination with the temperature regulation and control module. The problems of thermal response lag, uneven temperature and high energy consumption of traditional solid hydrogen storage are solved, the hydrogen storage / desorption rate, the cycle stability and the energy utilization efficiency are remarkably improved, and the method is suitable for large-scale long-period hydrogen storage of renewable energy sources.

The invention discloses a method for preparing magnesium borohydride by a solution method, and relates to the technical field of hydrogen storage materials. The method comprises the following steps: dissolving MgCl2 in tetrahydrofuran to form a magnesium source solution, dissolving NaBH4 in isopropylamine to form a boron-hydrogen source solution, mixing the two solutions, and stirring to react; carrying out centrifugation and microfiltration membrane suction filtration separation on the reacted mixture to remove solid impurities so as to obtain a clarified filtrate; and carrying out vacuum desolventizing treatment on the filtrate to finally obtain solid magnesium borohydride. The method is simple in process flow, can be completed under mild conditions, and has the advantages of low raw material cost and high operation safety; the prepared magnesium borohydride product has excellent performance of lower initial hydrogen desorption temperature, and the temperature is only 115.8 DEG C. The method is especially suitable for large-scale industrial production.

A hydrogen storage alloy containing zirconium, a method for producing the same and use of zirconium are disclosed. The hydrogen storage alloy has a content of A2B7 phase > 50 wt% and a composition as shown in formula (I): La m RE n Y p Zr q Ni a Mn b A c (I); wherein RE is selected from one or more of Ce, Pr, Nd, Sm and Gd; A is selected from one or more of Al, V, Cu, Fe and Co; wherein m, n, p, q, a, b and c represent the mole fraction of each element, respectively; m is in the range of 0.5-3, n is in the range of 0-2, p is in the range of 1-4, q is in the range of 0.2-2.5, a is in the range of 19-20.5, b is in the range of 0.4-1.2, and c is in the range of 0-0.5. The hydrogen storage alloy has a high hydrogen desorption plateau pressure.

The invention discloses a self-powered four-electrode hydrogen evolution device and application thereof.The self-powered four-electrode hydrogen evolution device comprises an acid-base asymmetric electrolyte formaldehyde-proton fuel cell, the acid-base asymmetric electrolyte formaldehyde-proton fuel cell comprises an anode, a cathode, an anolyte and a catholyte, the anode and the cathode both adopt ruthenium-doped copper nanotube electrodes, the anolyte is a mixed solution of potassium hydroxide and formaldehyde, and the catholyte is a mixed solution of potassium hydroxide and formaldehyde; the cathode electrolyte is a sulfuric acid solution; the formaldehyde-assisted water desorption hydrogen desorption electrolytic tank comprises an anode, a cathode, an anolyte and a catholyte, the anode and the cathode both adopt ruthenium-doped copper nanotube electrodes, the anolyte is a mixed solution of potassium hydroxide and formaldehyde, and the catholyte is a potassium hydroxide electrolyte; wherein the cathode and the anode of the acid-base asymmetric electrolyte formaldehyde-proton fuel cell are respectively connected with the anode and the cathode of the electrolytic tank. According to the invention, self-powered four-electrode hydrogen evolution without external voltage input is realized, 400% of hydrogen evolution Faraday efficiency can be obtained, and meanwhile, a high-value product formate is also obtained.

The invention discloses a PtNiCo nano-particle loaded carbon fiber self-supporting efficient hydrogen evolution catalytic material which is prepared by adopting electrostatic spinning, titration and Joule thermal shock technologies, PtNiCo nano-particles are uniformly dispersed on high-conductivity NiCo / CNFs, and interface charge redistribution induced electronic metal-carrier interaction between the PtNiCo nano-particles and the high-conductivity NiCo / CNFs can realize catalytic hydrogen evolution. The hydrogen desorption kinetics of the alloy part is optimized, and the hydrogen overflow effect is triggered, so that the hydrogen precipitation is promoted. According to the prepared catalytic material, the catalytic performance can be remarkably improved while precious metal is reduced, and the catalytic material has excellent HER catalytic activity in alkaline electrolyte and has good stability and durability.

The solid hydrogen storage heat management system comprises a thermocline energy storage tank, a solid hydrogen storage tank, a heat pump and a switching valve unit, and the thermocline energy storage tank is provided with a hot water area and a cold water area which are used for storing heat exchange media; the hot solid hydrogen storage tank is communicated with the thermocline energy storage tank and the heat pump through an outer circulation pipeline, the heat pump comprises a first heat exchanger, a second heat exchanger, a third heat exchanger and an inner circulation pipeline unit for flowing refrigerants, and the inner circulation pipeline unit comprises two stages of inner circulation pipelines; the heat pump is selectively started during hydrogen storage or hydrogen desorption according to the temperature of a heat exchange medium heat source or cold source; the switching valve unit is arranged on the outer circulation pipeline and used for switching the flowing path of the heat exchange medium according to the working conditions. According to the solid hydrogen storage thermal management system and the thermal management control method, through the cascade heat pump, the temperature difference of the heat exchange media at the two ends of the heat pump is increased, the response speed for the external temperature is increased, the energy consumption is reduced, and the hydrogen storage or hydrogen desorption efficiency is improved.

The invention discloses a derived carbon coated Mg-Ni-Ce hydrogen storage alloy. The phase composition after activation and carbonization treatment is an Mg phase, an Mg2Ni phase and a CeHx phase; the content of Mg is 80 to 84 wt.%, the content of Ni is 4 to 8 wt.%, the content of Ce is 10 to 14 wt.%, and the content of the PMMA polymer is 1 to 5 wt.%. The preparation method comprises the following steps: 1, preparing a PMMA coated Mg-Ni-Ce alloy precursor; and 2, preparation of the derived carbon coated Mg-Ni-Ce hydrogen storage alloy. When the alloy is used as a hydrogen storage alloy, under the hydrogen condition, the maximum hydrogen absorption amount reaches 5.40-5.60 wt.%, and the hydrogen desorption amount reaches 5.20-5.40 wt.%. After simulated poisoning treatment under the P atmosphere condition, the hydrogen absorption amount reaches 4.60-4.80 wt.%, and the hydrogen desorption amount reaches 4.0-4.20 wt.%.

This invention discloses a method for preparing a Mg-Ni-based hydrogen storage alloy containing rare earth elements, belonging to the technical field of hydrogen storage alloy materials and their preparation. This invention solves the problems of activation and limited hydrogen storage capacity in existing hydrogen storage materials. This invention uses the rare earth element La to modify the Mg-Ni-based hydrogen storage alloy, resulting in a significant improvement in the hydrogen storage performance of the modified Mg-Ni-La hydrogen storage alloy. Furthermore, based on the Mg-Ni-La alloy, La is substituted with the rare earth element Y, and the alloy's kinetic properties are enhanced by adjusting the content of rare earth elements Y and La, while simultaneously increasing the alloy's hydrogen storage capacity. The peak hydrogen desorption temperature of the substituted hydrogen storage alloy is reduced to 273℃, and the hydrogen storage capacity is 4.645 wt.% at 220℃ and 5MPa.

The purpose of the present invention is to provide a plated steel sheet capable of further improving hydrogen release properties while maintaining corrosion resistance after coating. This plated steel sheet has, on the surface of a steel sheet, a plating layer having a chemical composition containing, in mass%, 0.50-5.00% of Al, 0.50-3.00% of Mg, 0.01-15.00% of Fe, and optionally containing one or more elements selected from the group consisting of element group A, element group B, element group C, element group D, element group E, element group F, and element group G, with the remainder being Zn and impurities, in a surface structure in a plan view of the plating layer, the average area ratio of an [alpha]-precipitated [eta] phase, which is a metallographic structure in which the [alpha] phase is precipitated in the [eta]-parent phase, is 5-95%, and when a 130 [mu] m * 100 [mu] m region of the surface of the plating layer is observed by an electron microscope, the total length of cracks present in the region is 50 [mu] m or more.

The present invention relates to the technical field of purification, and discloses a hydrogen purification system, which comprises a primary purification module, the primary purification module comprises a first purification unit, a second purification unit and a thermal interaction unit, and the first purification unit and the second purification unit are arranged in parallel and alternately perform a hydrogen absorption reaction and a hydrogen desorption reaction, the thermal interaction unit is arranged between the first purification unit and the second purification unit, and heat energy released by the first purification unit or the second purification unit which performs hydrogen absorption reaction can be transferred to the second purification unit or the first purification unit which performs hydrogen desorption reaction through the thermal interaction unit. According to the scheme, based on the selective adsorption capacity of the magnesium-based solid hydrogen storage material to hydrogen, the magnesium-based solid hydrogen storage material is used for adsorbing the hydrogen and discharging impurity gas, so that the purity of the hydrogen is improved and can reach 99.9999% at most, meanwhile, heat energy released by hydrogen absorption reaction is stored by the heat interaction unit and is used for hydrogen desorption reaction, and the hydrogen desorption efficiency is improved. The energy consumption in the purification process is reduced.