248results about How to "High hydrogen storage capacity" patented technology

The invention discloses a preparation method of a hypha / nanoparticle composite sphere material. The preparation method is characterized by comprising steps as follows: preparing a culture medium; adding 4-20 ml of a nanoparticle aqueous solution containing 1-10 mg of nanoparticles per milliliter to the sterilized liquid culture medium, evenly mixing the mixture, inoculating the mixture with strains, culturing the mixture for 48-96 h under conditions that the temperature is 15-35 DEG C and rotating oscillation is performed at the speed of 80-200 r / min to form a hypha / nanoparticle composite sphere material, performing filtration to remove a liquid, soaking solids, namely, hypha / nanoparticle composite spheres, with a sodium hydroxide aqueous solution for 12 h, washing the spheres with deionized water until the spheres are neutral, and then performing freeze-drying to prepare the hypha / nanoparticle composite sphere material. The composite sphere material prepared with the method is applicable to fields of industrial catalysis, wastewater treatment, biomedicine and the like and has the characteristics of low cost, high activity, easiness in recovery and the like.

The invention belongs to the technical fields of inorganic material chemistry and new energy, and discloses a method for preparing porous carbon spheres doped with nitrogen and phosphorus and an application. Water serves as a solvent, polyphosphazenes microspheres and activating agents are mixed in a mass ratio of (0.2-2):1, concentration of the polyphosphazenes microspheres is maintained at a level of 10-30wt%, stirring is performed completely, the mixture of the polyphosphazenes microspheres and the activating agents is obtained through centrifugal separation, the mixture of the polyphosphazenes microspheres and the activating agents is subjected to carbonization, and finally the porous carbon spheres doped with the nitrogen and the phosphorus are obtained. The activating agents are potassium hydroxide, sodium hydroxide, calcium chloride or zinc chloride. The polyphosphazenes microspheres serve as a carbon precursor in the method, are synthesized directly under the room temperature condition, and has a simple art process and high productivity. Simultaneously, the activating agents are used for processing polyphosphazenes so as to improve specific surface areas and pore structures of the porous carbon spheres greatly and be beneficial to improve hydrogen storage capacity.

The invention relates to a steel plate and a process method thereof used for producing water heater linear enamel by a flexible thin slab rolling line (FTSR), belonging to the production field of enamel steel plates. The steel plate comprises the following chemical components in percentage by weight: 0.03-0.10wt% of carbon, 0.15-0.40wt% of manganese, less than or equal to 0.06wt% of silicon, 0.004-0.040wt% of sulphur, less than or equal to 0.15wt% of phosphorus, 0.03-0.05wt% of aluminum, 0.002-0.008wt% of nitrogen, 0.02-0.10wt% of titanium and the balance of ferrum and inevitable impurities. The tissue of the water heater linear enamel contains fine grain ferrite and a small quantity of pearlite tissues, and the granularity level of the water heater linear enamel is more than or equal to 10 levels. According to reasonable ingredient design and the FTSR process, steel for manufacturing water-storage water heater linear enamel for home appliances is produced; the steel plate has good enamel adhesion and scaling resistance, and also has the characteristics of few added alloy elements, few production working procedures, low production cost and the like; and a hot rolling scouring plate is used for replacing a cold rolling annealing plate.

The invention belongs to the field of hydrogen storage materials, and relates to a hydrogen storage high-entropy alloy taking a body-centered cubic structure as the principal thing and a preparation method for the hydrogen storage high-entropy alloy. A component expression formula of high-entropy alloy is as follows: (TiaZrbNbc)xMy, wherein a is greater than or equal to 5at% and smaller than or equal to 35at%, b is greater than or equal to at5% and smaller than or equal to 35at%, c is greater than or equal to 5at% and smaller than or equal to 35at%, a+b+c is equal to x, x is greater than or equal to 15at% and smaller than or equal to 100at%, M is any one or more of Hf, Fe, Co, Cr, Mn, Ni, Mo and W; and atomic percent of each M is 0-35%, and x+y is equal to 100. The preparation method for the hydrogen storage high-entropy alloy comprises the following steps of: adopting a non-consumable vacuum electric-arc furnace to smelt to prepare alloy; and adopting suction casting to sucking alloy into a water-cooling cooper mould, thereby obtaining a high-entropy alloy rod. The high-entropy alloy has high hydrogen storage capacity (3 mass% or more) and excellent hydrogen absorption and desorption dynamic performances; when hydrogen absorption and desorption amount is great, the high-entropy alloy, in comparison with a pure element, does not need to completely purify, so that cost can be saved to a great extent. The hydrogen storage high-entropy alloy taking the body-centered cubic structure as the principal thing has the characteristics of the high-entropy alloy, and has a wide application prospect in the fields of new energy resources and transportation.

The present invention relates to a nano crystal multi-phase mixed rear earth-magnesium system hydrogen-storing alloy and its preparation method. The preparation method of said alloy includes the following steps: smelting, homogenizing annealing, etc. and its smelting process is placing the La-enriched mixed rare earth, metal magnesium and metal nickel into an induction smelting furnace crucible according to a certain proportion, evacuating, charging protective gas, regulating power and temp. to melt metal, heat-insulating and fully stirring, injecting the molten metal into water-cooling ingotmould, cooling and discharging. Said alloy has anique components and multi-phase nano crystal structuer, and has good circulation stability.

The invention belongs to a hydrogen storage technology of the hydrogen energy field, and especially relates to a solid-state high-pressure mixing hydrogen storage tank based on solid hydrogen storage and high-pressure hydrogen storage. A main body of the solid-state high-pressure mixing hydrogen storage tank is a metal liner, and a fiber wound reinforced layer is wound and laid on the outer surface of the metal liner; the metal liner is internally provided with a plurality of close-contact metal square pipes which are fixed by a plurality of supporting rings; both ends of each metal square pipe are respectively welded with supporting and positioning stoppers, each supporting and positioning stopper is provided with a through hole and is provided with a filter sheet, and the metal square pipes are internally filled with hydrogen storage materials; both ends of the metal liner are each provided with an end plug, the end plug at one side is provided with a hydrogen valve, and the end plug at the other side is supplied for a plurality of heat exchange pipes to pass through; main bodies of the heat exchange pipes are uniformly distributed in an array formed by the metal square pipes. The metal hydride hydrogen storage device has the advantages of simple structure, easy fabrication and processing, and the nominal working pressure is not less than 35 MPa, and the hydrogen storage capacity is improved by 50% or more compared with that of a pure high-pressure hydrogen storage tank with the same specification.

The invention discloses a preparation method for MOF-5 metal-organic frameworks of interpenetrating structures. The preparation method comprises the following steps: (1) dissolving Zn(NO3)2.6H2O and H2BDC into a DMF solvent; adding TEA (triethylamine) to produce white precipitate and then filtering, wherein a filtrate is a precursor solution; and (2) heating for 24 to 48 hours at 90 to 110 DEG C to obtain MOF-5 crystals. The preparation method integrates the advantages of a TEA direct mixing method and a solvothermal method. Firstly, a reaction solution with the relatively high concentration is required for preparing the interpenetrating structures, while the reaction solution with the relatively high concentration can damage the MOF-5 seed crystals, and the damage can be avoided by adding the TEA; secondly, the white precipitate produced after the TEA is added is removed, and a remained clarified liquor is reserved for performing reaction, so that the high crystallinity of the MOF-5 crystals is guaranteed; in addition, the TEA is also introduced into intergranular mesoporous, so that the hydrogen storage capacity of interpenetrated MOF-5 is improved. The preparation method disclosed by the invention can also be used for preparing the carbon-material-doped interpenetrated MOF-5. The MOF-5 metal-organic frameworks of the interpenetrating structures, which are prepared by the preparation method, have the high hydrogen storage capacity and the high thermal stability.

The invention belongs to the technical field of standby power source systems of mobile phone signal substations, and particularly relates to a metal hydride hydrogen storage and fuel cell combination system. The combination system comprises a fuel cell system, a metal hydride hydrogen storage system and a water electrolysis hydrogen production system. A metal hydride hydrogen storage tank is arranged in a heat exchange chamber communicated with an exhaust pipeline. When a fuel cell works, the metal hydride hydrogen storage tank heats hydrogen storage alloy powder through hot air exhausted out of the fuel cell to release hydrogen, it is guaranteed that the hydrogen storage alloy powder is located in an effective hydrogen releasing temperature area, and therefore the effective hydrogen releasing amount is made to be the maximum. After hydrogen is introduced into the heat exchange chamber and air cooled by the hydrogen storage alloy powder is fully mixed with fresh air, the air is cyclically provided for the fuel cell, and therefore the cooling performance of the fuel cell can be improved. The method is not limited to an air cooling type fuel cell system, and can be applied to a water cooling type fuel cell system.

The invention relates to a preparation method of RE-Mg-Ni-M based hydrogen storage alloy. Under the protection of inert gases, the as-cast condition products of the RE-Mg-Ni-M based hydrogen storage alloy are smelted through using a cold-crucible magnetic-suspension furnace; heat-treated products are obtained by heat treatment of the as-cast condition products. The method has the steps that: (1) material is prepared; (2) metal Ni and M are smelted together; (3) metal RE is smelted; (4) the casting ingots obtained from step (2) and step (3) are smelted; (5) the ingot obtained from step (4) is overturned and smelted to obtain alloy solution, then master alloy of magnesium is added into the alloy solution to obtain the as-cast condition products of the RE-Mg-Ni-M based hydrogen storage alloy by cooling; (6) heat treatment is carried out to the as-cast condition products to get the heat-treated product. The single weight of the as-cast condition products and heat-treated products is 50-1000g; the content of magnesium in the products is close to designed content; the components of the as-cast condition products are uniform and have high hydrogen storage capacity; the structure and components of the heat-treated products are uniform and also have high hydrogen storage capacity and long cycling life.

The invention belongs to the field of new material technology for hydrogen production, and particularly relates to a multiple-efficiency water purification ceramic material as well as a preparation method and application thereof. The multiple-efficiency water purification ceramic material is prepared from the following raw materials: 30-50 parts of substrate component, 20-40 parts of hydrogen-richcomponent, 2-5 parts of antibacterial component and 3-10 parts of binder; wherein the substrate component is made from tourmaline, Shuiyuan stone, medical stone, calcium oxide and zeolite; the hydrogen-rich component is prepared from metallic magnesium powder, magnesium oxide powder, KDF alloy powder and three-dimensional graphene; the antibacterial component is prepared from far-infrared ceramicpowder, nanometer zinc oxide, titanium oxide and nanometer zirconium dioxide; the binder is prepared from highly pure distilled water, carboxypropyl cellulose and bentonite. The multiple-efficiency water purification ceramic material of the invention can not only produce hydrogen but also store hydrogen when being added to water, and can significantly increase the hydrogen content in the water. The invention also provides the preparation method and application of the multiple-efficiency water purification ceramic material, and the process is simple and easy to implement, and the multiple-efficiency water purification ceramic material is applied to products such as a water purifier, a water filter pitcher and a water cup.

The invention provides a solid hydrogen storage device. A cylinder is internally connected with a heat conductive sheet; a hydrogen inlet valve and a hydrogen outlet valve are respectively connected with the exteriors of the two ends of the cylinder; a filter passes through the central hole of the heat conductive sheet; two ends of the filter are respectively connected with the hydrogen inlet valve and the hydrogen outlet valve; the cylinder is internally provided with a snake-shaped water circulation pipe which is arranged longitudinally along the cylinder and is connected with the heat conductive sheet; the heat conductive sheet is connected with a sheet-shaped crossing. Large holes are uniformly distributed along 2 / 3 of the radius of the heat conductive sheet; small holes are uniformly distributed along 1 / 3 of the radius of the heat conductive sheet; the sheet-shaped crossing is horizontally arranged between the large holes and the small holes of the heat conductive sheet; the snake-shaped water circulation pipeline passes through the heat conductive sheet and deviously passes through the large holes in 120 DEG on the heat conductive sheet with an arc ranging from 30-90 DEG; the water outlet and the water inlet of the snake-shaped water circulation pipe are respectively arranged at the end plates of the two ends of the cylinder.

The invention discloses an under-measurement Laves phase hydrogen storage alloy and a preparation method thereof. The general chemical formula of the alloy is TiuZrxMnvMyVz, wherein x is more than or equal to 0 and is less than or equal to 0.2; y is more than or equal to 0.1 and is less than or equal to 0.4; z is more than or equal to 0.1 and is less than or equal to 0.5, u plus x is equal to 1, and v plus y is equal to 1.5; the optimal range of y is more than or equal to 0.1 and is less than or equal to 0.2, and the optimal range of z is more than or equal to 0.1 and is less than or equal to 0.3; M element can be Cr, Ni or Cu; and the preparation method comprises the following steps: weighing the alloy according to the blending ratio; repeatedly melting block-shaped pure metal in a magnetic suspension high frequency induction furnace under the protection of argon gas for two times to three times; and annealing the obtained cast alloy for six to eight days at the temperature of 950 DEG C to 1050 DEG C under the protection of inert gas. The invention has the advantages of large hydrogen storage amount, small lag, long platform area and other good comprehensive performances.

The invention provides an Mg-based composite hydrogen storage material containing alkaline earth metals-aluminum hydride and a preparation method thereof, which belongs to the technical field of hydrogen storage material. The chemical general formula of the hydrogen storage material is MgH2+x wt.%(Sr1-yCay)2AlH7+z wt.%TiF3, wherein x is more than or equal to 30 and less than or equal to 50, y is more than or equal to 0 and less than or equal to 0.5, and z is more than or equal to 2 and less than or equal to 10. The hydrogen storage material is gained by mechanically ball milling three materials powder of MgH2, (Sr, Ca)2AlH7 and TiF3, a planetary ball mill is adopted when ball milling, the ball material ratio is 15:1 to 20:1, the rotational speed is 350 to 400rpm, the ball milling time is 10 to 20h, the ball milling protecting atmosphere is argon gas or hydrogen gas, and the atmosphere pressure is 1 to 5atm. The invention has the advantages that: the preparation technique is simple, the provided composite hydrogen storage materials do not need to be activated, and have high hydrogen storage capacity, simultaneously have good low temperature hydrogen absorption dynamic performance and high hydrogen absorption and desorption cycling stability. The invention is applicable to the safe and efficient storage and transportation of the hydrogen, especially the hydrogen fuel cells and other fields.

A hydrogen bearing REMg3 alloy has a molecular formula: RE1.2-xMg3Niy, where RE is rare-earth mixture, x=0-0.4 and y=0-1. Its preparing process includes proportionally loading RE, Mg and Ni in crucible of induction furnace, vacuumizing, filling protective gas, smelting and cooling.

The invention relates to a rare earth-magnesium-transition metal base hydrogen storage metal with high hydrogen storage capacity and moderate hydrogen storage temperature and preparation method thereof. The metal is characterized in that the chemical formula thereof is REMgxMy, wherein x is more than 1 and less than 2, y is more than 1 and less than 3; RE is one or more than one of rare earth metals of La, Ce, Pr, Nd, cerium rich mish metal Mm and lanthanum rich mish metal M1; M is one or more than one of transition metals of Cu, Ni, Mn, Fe and Zn. The rare earth-magnesium-transition metal base hydrogen storage metal provided by the invention is also characterized in that the metal at least contains a multiphase structure of CeMg3 type LaMg3 phase and LaMg2Cu2 phase. The invention also provides a preparation method of the rare earth-magnesium-transition metal base hydrogen storage metal. The preparation method mainly includes that induction melting is adopted, Mg base master alloy is utilized to substitute magnesium and used as raw material, secondary charging is used for preparing the metal, and the metal is annealed. The hydrogen storage metal of the invention has the advantages that the hydrogen storage capacity at 200 DEG C is more than 3wt% and the metal can be used as solid-state hydrogen storage material.

The invention belongs to the technical field of environment-friendly materials and particularly relates to a multifunctional ceramic material as well as a preparation method and application thereof. The multifunctional ceramic material is prepared from the following raw materials in parts by weight: 20-30 parts of zirconium sodium phosphate, 10-30 parts of hydrogen-enriched water porcelain, 5-10 parts of negative ion powder, 20-30 parts of modified shell powder, 3-5 parts of an inorganic antibacterial agent, 1-3 parts of three-dimensional graphene, 5-10 parts of activated carbon, 5-10 parts ofcalcium sulfite and 5-20 parts of a binder, wherein the inorganic antibacterial agent is nano-zinc oxide, cerium oxide, titanium oxide and silver oxide; and the binders are hydroxy propyl cellulose and bentonite. The multifunctional ceramic material has the functions of preparing weak base water, hydrogen-enriched water and negative potential water and further has the efficacies of resisting bacteria, removing chlorine and purifying water. The preparation method has the characteristics of easiness in industrial production and good economic benefit; and the multifunctional ceramic material iswide in application field and can be applied to water purifiers, water purifying kettles, water cups, dish washers and humidifier products.

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 an mg-based hydrogen storage material, which comprises15 to 25 weight percent of nickel, and 5 to 15 weight percent of cerium contained rare earth elements, the rest is magnesium. The material mainly consists of nano-crystalline; in the nano-crystalline, the grain size of more than 70 percent of crystalline is lower than 10 nm. The invention further relates to a manufacture method of the material.

The invention relates to Mg-based hydrogen storage nano-sized powder and a preparation method thereof. The hydrogen storage nano-sized powder is obtained by performing high-temperature melting and evaporation to mixture of magnesium metal and metal oxide and performing passivation. The metal oxide is one or more of yttrium oxide, cerium oxide, iron oxide, titanium oxide and niobium oxide. Weight percentage of the metal oxide is 0.1%-20%, and the balance is magnesium metal. The Mg-based hydrogen storage nano-sized powder has high hydrogen storage dynamics performance and high hydrogen storage capacity and can be stored stably in air, hydrogen absorption amount at about 300 DEG C reaches 7%, and hydrogen absorption amount at 350 DEG C within 100s reaches more than 5weight%.

The invention discloses a method for preparing a nanometer limited range magnesium-based hydrogen storage material. The nanometer limited range method belongs to the technical field of new energy materials. The method is characterized in that the hydrogen storage material is formed by loading magnesium hydride (MgH2) in nanopores of a mesoporous framework material. The method comprises the following steps: dipping dibutyl magnesium (MgBu2) and a mesoporous framework material, replacing MgBu2 with MgH2 loaded inside and outside the nanopores of the mesoporous framework material in a high-pressure reactor under high temperature and high pressure, washing MgH2 loaded outside the pores away by using pentane, drying, thereby obtaining the material. The nanometer limited range magnesium-based hydrogen storage material prepared by the method can release hydrogen at room temperature and has excellent properties in hydrogen absorption and desorption kinetics and hydrogen desorption thermodynamics. The method disclosed by the invention is easy to operate and high in synthesis speed and the prepared material is high in dispersity; therefore, the method has ideal application prospects.

The present invention relates to one kind of TiFe-base hydrogen storing alloy in the chemical composition of Tix-yMyFe1-zCraNz, where, M is one of Zr, V and Nb, N is one of Ni, Co, Cu, Mo, Mn, Al and Sn, x is 1.0-1.3, y is 0.01-0.15, a is 0.01-0.2, and z is 0.01-0.1. The TiFe-base hydrogen storing alloy may be smelted in a non-self consuming vacuum arc furnace or a vacuum MF inducing furnace. It has easy activation, high reaction speed with hydrogen, maximum hydrogen storing capacity of 235 ml / g and low cost.

The invention relates to a method for hydrogen production and storage through catalysis of water splitting by an MOF (metal-organic framework) composite electrode. The method utilizes the unsaturated metal sites and the porous structure of MOF to conduct electrocatalysis on water splitting so as to produce hydrogen, and the produced hydrogen is stored in an MOF porous material on line, thus realizing integration of hydrogen production and storage. The method greatly reduces the hydrogen production overpotential, is simple in operation and is easy to control, storage and release of hydrogen are realized through charge and discharge, the absorption and desorption conditions are mild, the current efficiency is greater than or equal to 75%, and the electrochemical hydrogen storage capacity can reach 920mAh / g. The method provided by the invention realizes synchronization of hydrogen production and storage, and greatly promotes the research and industrialization process of the water splitting technology for hydrogen production and storage.

The present invention is a kind of one-dimensional hydrogen-stored nanometer carbon material and its preparation process, and features that the surface of one-dimensional nanometer carbon is etched by using the plasma etching process, and this increases and expand hydrogen diffusing passage, makes nmore hydrogen enter the interior of one-dimensional nanometer carbon, and raises its hydrogen storing capacity. Carbon nanometer tube and / or carbon nanometer fiber are etched in the microwave plasma generator with etching power of 0.3-3 KW, etching temperature of 300-1500 deg.C, treating pressure of 600-6000 Pa, etching gas hydrogen and condition gas of nitrogen and / or argon. The one-dimensional nanometer carbon of the present invention has hydrogen capacity of 2.5-4.5 wt%.

The present invention relates to the preparation process and device of Mg-based hydrogen storage materials in homogeneous high magnetic field. In this process metal powder is mixed as the designed chemical composition, dispersed by ultrasonic, dried, compacted and fragmented; then it is placed in the reaction kettle that is vacuumized and charged with hydrogen; then in homogeneous high magnetic field of 1-14T it is heated to 400-750DEG C slowly and the temperature is preserved, the hydrogen storage alloy is obtained after cooling. The special device in the present invention features that it includes generating system of homogeneous high magnetic field and reaction kettle for high temperature and pressure. This invention decreases the dehydriding temperature of the Mg-based hydrogen storage material while increases its absorbing and releasing rates of hydrogen.

The invention relates to a method applicable to a palladium-modified metal electrode with foamed nickel materials as bases. The method comprises the steps that an oxidation layer and oil fouling on the surface of the foamed nickel base materials are removed; bivalent cobalt salt and sodium salt are used for preparing electro-deposition liquid, an inert graphite electrode is used a positive electrode, the foamed nickel base materials are used as a negative electrode, electro-deposition is performed with constant temperature and constant current for preparing a Co / foamed nickel electrode, and drying is performed; the Co / foamed nickel electrode is placed in a tube type resistance furnace, the temperature is increased at a constant speed till reaching the preset value, constant-temperature calcination is performed, and then the Co3O4 / foamed nickel electrode can be obtained; and H2PdC14 impregnation-deposition liquid is prepared, the Co3O4 / foamed nickel electrode is placed in the impregnation-deposition liquid, the impregnation-deposition liquid is shaked in a table concentrator till the impregnation-deposition liquid becomes colorless, and therefore a Pd / Co3O4 / foamed nickel electrode is obtained. The hydrogen-evolution potential of the electrode can be lowered, the hydrogen production and storage capability of the system are improved, and it is ensued that electrocatalytic reduction and degradation are rapidly and efficiently performed on halogenated organic matter.

Production of magnesium-base and hydrogen-storage alloy and composite material by laser sintering method is carried out by mixing elementary metal or hydrogen-storage alloy powders by ball mill, pressing mixed alloy biscuit, loading at 20-30MPa for 30 seconds, laser sintering by CO2 laser at 500-1600W, inducing into circulation water and cooling. The scanning speed ratio reaches to 100-120mm / min and diameter of light spot is 3-5mm. It's cheap, has less consumption, more yield and shorter sintering time, better performance.

The invention relates to a hydrogen storage composite material with the general formula of (NaAlH4)y-Rx, wherein R is titanium-vanadium base solid solution alloy, y and x are both mole percent, x is not less than 5 mol% and is not more than 50mol %, and y+x=100mol %. R solid solution alloy is Tix1CrX2Vx3Fex4, wherein x1+x2+x3+x4=100at%(atom percent), x1 is not less than 25at % and is not more than 40at%, x2 is not less than 20at% and is not more than 45at%, x3 is not less than 20at% and is not more than 55at%, and x4 is not less than 0at% and is not more than 10at%. The hydrogen storage composite material is prepared by adopting a hydrogen-protecting mechanical ball-milling synthesizing process, and has effective hydrogen discharge of above 2.0wt% within 1h under the conditions that the temperature is 150 DEG C and the pressure is 0.1MPa and the total hydrogen discharge amount is above 3.8wt%. The preparation method of the hydrogen storage composite material is simple and easy, and has higher hydrogen storage capacity and hydrogen charge and discharge rate under mild conditions.

The invention belongs to the field of carbon material, and relates to a graphene-based carbon fiber high in strength and hydrogen storage capacity, and a preparation method thereof. The fiber main body of the graphene-based carbon fiber high in strength and hydrogen storage capacity is composed of graphene and amorphous carbon, wherein the weight amount of graphene accounts for 60 to 100% of the weight amount of the fiber main body; the fiber main body may also be loaded with carbon nanotube, the fiber main body, or the fiber main body and the carbon nanotube grows on the fiber main body are modified with metal particles; when the total weight amount of the graphene-based carbon fiber is taken as 100wt%, the content of the metal particles ranges from 0 to 30wt%, and the content of carbon nanotube ranges from 0 to 300wt%. The graphene-based carbon fiber is prepared through following steps: oxidized graphene based initial fiber is prepared through spinning of a spinning solution preparedthrough mixing of an oxidized graphene aqueous solution and a polymer solution based on solution spinning method, and the initial fiber is subjected to carbonization so as to obtain a finished product. The preparation method is simple; the performance is excellent; and the graphene-based carbon fiber can be taken as a hydrogen storage material, and can be used in the fields such as new energy automobile.

The invention relates to a preparation method for a grapheme hydrogen storage electrode, belonging to the fields of preparation technologies and application of nano materials. The preparation method is characterized in that automatic control direct current arc hydrogen plasma equipment is utilized; a pure graphite block is used as a consumption anode, and a carbon rod is used as a cathode; a certain amount of hydrogen is introduced, and then the steps of evaporation, condensation, passivation and the like are carried out to prepare the grapheme material; the grapheme material is used as an active substance and mixed with a binder according to a certain mass ratio; and then an obtained mixture is dried in an extruding mode to manufacture the electrochemical hydrogen storage electrode. The preparation method has the advantages that the grapheme powder material has simple preparation process, high product purity and low cost, and the volume production can be realized; and because the grapheme product has a large quantity of folds, the specific surface area of the grapheme product is increased, and the bonding mismatching between slices is improved; and interlayer polarization is caused so as to form electrochemical hydrogen storage sites, therefore the hydrogen storage quantity of the grapheme electrode is improved.

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.