170results about How to "Short preparation time" patented technology

The invention discloses a carbon-silicon negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: S1, carrying out mixed reaction on a lithium source compound, a lanthanum source compound and a titanium source compound to obtain a mixed reactant; mixing the mixed reactant with a carbon source compound, and dispersing and emulsifying to obtain element-doped microspheres; s2, carbonizing the element-doped microspheres in the step S1 to obtain carbides, and activating the carbides to obtain a porous carbon material; and S3, performing silicon deposition on the porous carbon material in the S2 to obtain silicon deposition porous carbon, and performing carbon deposition on the silicon deposition porous carbon to obtain the carbon-silicon negative electrode material. The carbon-silicon negative electrode material disclosed by the invention is high in lithium ion transmission rate, the problem of poor electronic conductivity of silicon is solved, and the electrical property of a battery can be effectively improved.

The invention discloses a molecular sieve confinement noble metal catalyst for CO-SCR denitration as well as a preparation method and application thereof, and belongs to the technical field of catalytic reduction of nitrogen oxides. The catalyst comprises a molecular sieve carrier and an Ir metal nanocluster loaded in the molecular sieve carrier through confinement encapsulation. The preparation method comprises the following steps: mixing a first metal precursor solution with a first ligand to obtain a first mixed solution; mixing a second metal precursor solution with a second ligand to obtain a second mixed solution; mixing a silicon source, an aluminum source, alkali and a solvent to obtain a molecular sieve precursor solution; and mixing the molecular sieve precursor solution with the first mixed solution, then adding the second mixed solution, carrying out a hydrothermal crystallization reaction, and then carrying out centrifugal washing, drying and calcining to obtain the catalyst. The catalyst has good stability, shows a high nitrogen oxide conversion rate in an atmosphere containing O2 and SO2, and improves the catalytic ability of the catalyst to nitrogen oxides under different conditions.

The invention relates to the technical field of sulfur hexafluoride gas thermocatalytic conversion, and discloses a supported catalyst for SF6 thermocatalytic conversion and a preparation method thereof, and the preparation method comprises the following steps: titanium dioxide is supported on the surface of SiC in a nanoscale particle form, and the mass ratio of titanium dioxide to silicon carbide is 1: 5. The catalyst and the preparation method provide possibility for harmless treatment of SF6 under milder conditions, and the provided preparation method has the advantages of high loading efficiency, simple preparation device, reduction of the preparation cost, increase of the effective reaction area of the catalyst, and good application potential and popularization prospect.

The invention relates to the field of air filtration, in particular to a method for rapidly preparing ZIF-8 / polypropylene melt-blown cloth fiber membranes in batches at low cost. Aiming at the problems of high cost, long preparation time, complex process and the like of the existing method for growing ZIF-8 on the surface of polypropylene melt-blown cloth to improve the air filtering performance, the invention provides a method for rapidly preparing ZIF-8 / polypropylene melt-blown fiber membranes in batches at low cost. The preparation method comprises the following steps: firstly, pretreating the surface of polypropylene melt-blown cloth by using an inorganic aqueous alkali solution, then sequentially putting the melt-blown cloth into a zinc ion aqueous solution and a 2-methylimidazole / N, N-dimethylformamide mixed aqueous solution under an ultrasonic condition, and drying to prepare the ZIF-8 / polypropylene melt-blown fiber membrane. According to the preparation method, water is taken as a main solvent, and a small amount of N, N-dimethylformamide is added into the water, so that rapid growth on polypropylene melt-blown cloth at a small molar ratio of 2-methylimidazole to zinc nitrate hexahydrate is realized, and the preparation method is suitable for large-scale industrial production for air filtration.

The invention discloses gold-titanium alloy nanoparticles as well as a wet chemical preparation method and application thereof. The preparation method comprises the following steps: in a water-free and oxygen-free environment, uniformly dissolving a gold salt, a titanium salt and a support carrier in an ether solvent, mixing with lithium triethylborohydride, transferring into a high-pressure reaction kettle, stirring and heating to 180-220 DEG C under the inert gas pressure of 0.5-1 MPa, and keeping the temperature for 1-4 hours; and after the mixture is cooled to the room temperature, the product solution is diluted with normal hexane, cleaning and drying are conducted, and the gold-titanium alloy nanoparticles are obtained. According to the invention, gold salt and titanium salt adsorbed on a support carrier are reduced by using a strong reducing agent under the conditions of high temperature and high pressure, and highly dispersed nanoparticles with uniform particle size are prepared; by introducing the supporting carrier, the problem that the particle size is increased due to agglomeration of alloy nanoparticles at high temperature is avoided, the catalytic performance and the anti-sintering performance of the catalyst are enhanced through strong interaction with the carrier, and the catalyst has wide application prospects in the fields of CO thermal oxidation and CO electrochemical oxidation.

The invention relates to plasticity-enhanced lead lanthanum zirconium tin titanate-based antiferroelectric ceramic and a preparation method thereof. The chemical formula of the zirconium tin lead titanate lanthanum-based anti-ferroelectric ceramic is (Pb < 0.975-x > La < 0.02 > Sr < x >) (Zr < 0.5 > Sn < 0.37 > Ti < 0.13 >) < 0.9975 > O < 3 >, x is smaller than or equal to 0.10; and sintering by adopting a flash sintering technology to prepare the plasticity-enhanced lead lanthanum zirconate tin titanate-based antiferroelectric ceramic. Wherein the initial electric field intensity is set to be 100-300 V / cm, and the temperature rise rate of the flash sintering furnace body is 5-15 DEG C / min; when the reading of the current detector reaches the order of magnitude of [mu] A, the electric field intensity is increased to 200-500V / cm; after the current density value reaches 10-30 mA / mm < 2 >, the stable current density is kept for 90-200 s; preferably, the temperature rise rate of the flash burning furnace body is 8-12 DEG C / min.

The invention discloses a method for preparing a PLA-PCL polyester copolymer for a biomass pressure-sensitive adhesive under a non-catalytic condition, which comprises the following steps: S1, putting L-LA and epsilon-CL into a reaction container, adding ethylene glycol or glycerol into the reaction container, and subsequently carrying out argon protection treatment; s2, heating the reaction container containing the sample at 180-240 DEG C for 3 hours; and S3, after the reaction, forming a uniform system, namely obtaining the PLA-PCL polyester copolymer for the biomass pressure-sensitive adhesive. According to the preparation method, L-LA and epsilon-CL are taken as raw materials, an alcohol compound is taken as an initiator, and the PLA-PCL polyester copolymer for the biomass pressure-sensitive adhesive is directly prepared through reaction at high temperature. The method has the beneficial effects that no catalyst is needed in the reaction process, the process method is simple and convenient, and the preparation process is short in time consumption; the prepared product can be used for preparing a biomass pressure-sensitive adhesive.

The invention belongs to the technical field of inorganic non-metallic materials, and discloses a method for microwave synthesis of silicon carbide whiskers from a porous precursor, which comprises the following steps: mechanically stirring and mixing a silicon source and a carbon source according to a carbon-silicon molar ratio of (3-25): 1, and obtaining the porous precursor by adopting a certain forming process and a certain pore-forming process; the porous precursor is wrapped with quartz powder and placed in a microwave sintering furnace to be sintered, a sample is subjected to heat preservation for 15-25 min at the temperature of 900-1350 DEG C, and the three-dimensional silicon carbide whiskers are prepared. A silicon source and a carbon source are mixed and molded in the form of a porous precursor and then are subjected to microwave heating, in the microwave heating process, excited microwave plasmas enter pores in a three-dimensional multidirectional form, gas in the pores is quickly accumulated under the action of buried powder, the air pressure is quickly increased, the plasmas are promoted to generate an instantaneous gas-phase reaction, and the pore-forming effect is improved. And the three-dimensional silicon carbide crystal whiskers with good crystal development are formed by virtue of sufficient space in the holes.

The invention provides a SnIn4S8-coated FeNi2P hollow nanorod composite material and a preparation method thereof. The photocatalytic hydrogen production performance and the stability of the SnIn4S8-coated FeNi2P hollow nanorod composite material are researched. The preparation method of the SnIn4S8-coated FeNi2P comprises the following steps: synthesizing a FeNi2-MIL-88 nanorod with a hollow structure by adopting a hydrothermal method, and then obtaining the FeNi2P by adopting a gas phase phosphating method. And finally, coating the surface of the FeNi2P with SnIn4S8 by virtue of an in-situ growth method, so as to obtain the SnIn4S8-coated FeNi2P hollow nanorod composite material. The result shows that the hydrogen production amount of the SnIn4S8-coated FeNi2P within 3 hours reaches 18083.93 [mu] mol / g, and the SnIn4S8-coated FeNi2P has good cycle stability.

The invention provides a preparation method of a high-entropy alloy catalyst, which comprises the following steps: weighing at least five metal precursors such as iron, nickel, cobalt, magnesium, aluminum, niobium and tungsten according to a certain molar ratio, premixing solid powder by a mechanical ball milling method, filling the mixed powder into a crucible of an electric arc melting furnace, placing a reaction device in an inert atmosphere, and carrying out ball milling to obtain the high-entropy alloy catalyst. And material oxidation is prevented. Through arc discharge, the raw materials are melted in a rapid heating mode, and meanwhile in the melting process, electromagnetic stirring is used for ensuring that the materials are fully mixed and homogenized. And after smelting is completed, a melt is rapidly cooled and solidified under the action of a cooling system, after a sample is completely cooled, the crucible is taken out, thermal reduction is conducted in a reducing atmosphere, and the ammonia decomposition high-entropy alloy catalyst is obtained. The catalyst prepared by the invention has the characteristics of high activity, short preparation process time and high homogenization degree.

The invention belongs to the technical field of materials and harmful pollutant removal, and particularly relates to a graphite-phase carbon material for adsorbing and removing mycotoxin in food as well as a preparation method and application of the graphite-phase carbon material. The preparation method of the graphite-phase carbon material comprises the following steps: at normal temperature and normal pressure, ball-milling graphite or a mixture of graphite and ferroferric oxide into solid powder, so as to prepare the graphite-phase carbon material for adsorbing and removing mycotoxin in food. The graphite phase carbon material is good in adsorption effect; the composition can be used for preparing aflatoxin, zearalenone, ochratoxin, deoxynivalenol and T-2 toxin in various oils such as peanut oil, soybean oil, corn germ oil, rapeseed oil, sesame oil, walnut oil, linseed oil, rice bran oil, wheat germ oil, edible plant blend oil, sunflower seed oil, olive oil, camellia oleosa seed oil, perilla seed oil and almond oil. And various fungaltoxins such as fumonisins are removed, so that the pollution level of the fungaltoxins in the edible vegetable fat can be effectively reduced.

The invention discloses yttrium oxide powder and a preparation method thereof. The preparation method of the yttrium oxide powder comprises the following steps: 1) mixing an yttrium salt solution with a precipitator solution to prepare a mixed solution; wherein the molar ratio of yttrium ions in the yttrium salt to the precipitant is 1: (2-15); 2) adding C2-C5 alkanediol into the mixed solution, and reacting at the temperature of 60-160 DEG C to prepare a precipitate precursor; and 3) calcining the precipitate precursor prepared in the step 2) at 500-1200 DEG C to prepare the yttrium oxide powder. The yttrium oxide powder prepared by the method is small in primary particle size and relatively narrow in particle size distribution.

The invention relates to the technical field of multifunctional super-hydrophobic materials, in particular to a photo-thermal super-hydrophobic anti-icing and deicing composite material based on a template collaborative ablation method, a preparation method of the photo-thermal super-hydrophobic anti-icing and deicing composite material and a photo-thermal super-hydrophobic anti-icing and deicing surface. The method comprises the following steps: uniformly dispersing photo-thermal nano-particles as a filler in a high-molecular polymer, forming a film with a micro-pit structure by using abrasive paper as a template through a pouring and curing film forming method, and forming nano-wrinkles or nano-particles similar to synapses on the micro-pit structure of the film through flame ablation treatment. The prepared photo-thermal super-hydrophobic anti-icing and deicing composite material based on the template collaborative ablation method has excellent photo-thermal and hydrophobic performance, can be used as a photo-thermal super-hydrophobic anti-icing and deicing surface, and is simple in preparation process, low in preparation cost and suitable for large-scale production.

The invention discloses a coating type matte PET film and a preparation method thereof, and belongs to the technical field of films, the preparation method comprises the following steps: preparing an antistatic agent, preparing a delustering agent, preparing a coating liquid, and coating. The preparation of the coating liquid comprises the following steps: mixing a waterborne polyurethane dispersion liquid, an antistatic agent, a matting agent and a waterborne organic silicon defoaming agent, stirring at room temperature, adding an acrylic leveling agent, a wear-resistant agent and 3-aminopropyltrimethoxysilane, continuously stirring, adding polycarbodiimide, and continuously stirring to obtain the coating liquid; the prepared coating type matte PET film is high in haze, good in appearance, free of fisheyes and shrinkage cavities in the surface, uniform in haze, high in coating adhesive force, short in preparation time and high in water resistance.

The invention provides a Kevlar nanofiber composite membrane and a preparation method thereof, and relates to the field of nanofiber composite membrane preparation. The method comprises the following steps: respectively preparing a Kevlar nanofiber dispersion liquid and PVA-co-PE nanofibers, diluting the Kevlar nanofiber dispersion liquid to obtain a Kevlar nanofiber hydrogel, mixing the Kevlar nanofiber hydrogel with the PVA-co-PE nanofibers, adding a mixed solution of water and isopropanol and a cross-linking agent, and carrying out stirring, cross-linking, suction filtration and hot pressing to obtain the Kevlar nanofiber composite membrane. The cross section of the composite film is of a compactly stacked layered embedded structure, so that the composite film has excellent mechanical strength and durability, can effectively resist external stress, and avoids mechanical damage. In addition, due to the layered structure, the composite film has good machinability, processing operations such as cutting, coating and stacking can be conveniently carried out in practical application, and various industrial and engineering application requirements can be met. The preparation method provided by the invention is simple and convenient to operate, economical and efficient, has high reproducibility and is easy to realize industrialization.

The invention provides a solid acid catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: carbonizing lignin to obtain a carbon-based carrier; placing the carbon-based carrier in a plasma modification instrument, vacuumizing, and then introducing gas for activating treatment to obtain a lignin carbon-based material; and carrying out sulfonation treatment on the lignin carbon-based material to obtain the solid acid catalyst. The catalyst has the advantages of being short in preparation time, small in pollution, high in catalytic efficiency, recyclable and the like, can be applied to catalytic conversion of a fructose solution into 5-hydroxymethylfurfural, the yield can reach 70%-90%, corrosion of an inorganic acid catalyst to reaction kettle equipment is avoided due to use of the solid acid catalyst in the reaction process, and the catalyst is an environment-friendly catalyst.

The invention relates to a preparation method of an oxygen-bridged iron-silicon diatomic electrocatalyst, which comprises the following steps: stirring and complexing an iron source and a silicon source, mixing the complexing solution with a graphene oxide solution, and carrying out ultrasonic treatment to obtain a precursor solution; performing hydrothermal reaction on the precursor solution to obtain a reaction product; and carrying out freeze drying treatment on the reaction product, and then carrying out high-temperature nitridation by adopting a chemical vapor deposition method to obtain the oxygen-bridged iron-silicon diatomic electrocatalyst. The oxygen-bridged iron-silicon diatomic electrocatalyst prepared by the invention has excellent four-electron oxygen reduction electrocatalytic performance under acidic and alkaline conditions, and is high in activity, strong in selectivity and stable in performance.

The invention discloses a preparation method and application of a biomimetic mineralized hydrogel coating with high adhesiveness, and relates to the technical field of bone implant surface modification. The method comprises the following steps: immersing a bone implant subjected to surface pretreatment into a polyvinyl alcohol solution, then carrying out single freezing and thawing cycle, and then carrying out annealing treatment, alternately soaking the annealed bone implant in a calcium-containing solution and a phosphorus-containing solution, and carrying out surface mineralization treatment; then, inducing a product subjected to surface mineralization treatment to obtain hydroxyapatite; the biomimetic mineralized hydrogel coating with strong adhesiveness is obtained on the surface of the bone implant. According to the method, the surface of the bone implant is coated with the strong-adhesion hydrogel coating by adopting a dip-coating method, and the thickness and the surface flatness of the coating can be controlled by adjusting the dip-coating frequency.

The invention relates to a safe lithium battery diaphragm with a high-heat hole-closing function and a preparation method and application thereof, the lithium battery diaphragm is a composite membrane with a multilayer structure, and comprises a bacterial nano cellulose membrane and a composite layer with the heat hole-closing function; wherein the composite layer is prepared from a hot melting material and bacterial nano cellulose. Compared with a traditional commercial polyolefin diaphragm, the lithium battery diaphragm provided by the invention not only has the characteristics of natural three-dimensional nano network structure, good thermal stability, high liquid absorption rate, high ionic conductivity and the like, but also has thermal closed pores and an optional flame-retardant function, so that the safety of a lithium battery is greatly ensured, and the lithium battery diaphragm has a good market application prospect.

The invention discloses a preparation method and application of a biochar composite ferroferric oxide photocatalyst, and relates to the technical field of photocatalyst preparation, and the preparation method specifically comprises the following steps: S1, preparing biochar; and S2, preparing the biochar composite ferroferric oxide photocatalyst. The photocatalyst disclosed by the invention is stable in performance, good in tetracycline degradation effect, high in light source utilization rate, low in raw material price, free of pollution, short in preparation time and low in energy consumption, and has a good application prospect in the fields of solving environmental pollution and energy crisis and photocatalysis application.

The invention relates to a construction method and application of a monkey pox virus infected immunodeficiency mouse model, and belongs to the technical field of gene engineering and virus infection. The invention provides a construction method of a monkey pox virus infected immunodeficiency mouse model, which comprises the following steps of: knocking out interferon I, interferon II and interferon III passages by using a CRISPR / Cas9 technology, specifically knocking out a mouse I type interferon receptor IFNAR, knocking out a mouse II type interferon receptor IFNGR and knocking out a mouse III type interferon receptor IFNLR. The mouse constructed by the method disclosed by the invention has the severe condition of infection of the monkey pox virus IIb branch, and can be used for screening medicines for treating infection of the monkey pox virus IIb subtype branch.

The invention relates to the technical field of high-entropy ultrahigh-temperature carbide ceramics, and discloses a boron-containing and nitrogen-containing carbide and a preparation method thereof. The molecular formula of the boron-containing and nitrogen-containing carbide is XCyBzNw, X is at least four of Zr, Hf, Ti, Ta, Nb, V and W, y is more than or equal to 0.6 and less than 1, z is more than 0 and less than or equal to 0.4, w is more than 0 and less than or equal to 0.4, y + z + w is less than or equal to 1, and the boron-containing and nitrogen-containing carbide is a single phase solid solution and has a face-centered cubic structure. The boron-containing and nitrogen-containing carbide provided by the invention has temperature resistance and oxidation resistance of an ultrahigh melting point, and has important potential application in an ultrahigh-temperature thermal protection system.

The invention belongs to the technical field of starch modification, and discloses a method for preparing starch citrate through solvent-free continuous stirring, which comprises the following steps: step a, a drying stage: firstly, crushing citric acid particles, sieving for the first time, uniformly mixing the citric acid powder sieved for the first time with starch, drying at high temperature, and cooling to room temperature, after crushing, sieving for the second time to obtain a citric acid-starch mixture; and b, a continuous stirring reaction stage: stirring the citric acid-starch mixture at high temperature while reacting to obtain starch citrate, cooling, washing with ethanol, drying, crushing, and sieving for the third time to obtain the starch citrate. The method does not use any solvent and catalyst, does not generate waste water and waste gas, is green and environment-friendly, and is short in preparation time and high in efficiency; by means of high-temperature drying pretreatment, the caking problem caused when stirring and reacting are conducted in the follow-up process is greatly solved, stirring and reacting are conducted in the follow-up process, the contact opportunity of starch and citric acid is increased, and the content yield of resistant starch is increased.

The invention relates to a diffusion process of a TOPCon battery, which comprises the following steps: S1, placing a battery piece in a diffusion furnace tube, performing boron source deposition for multiple times at a preset temperature, and forming a PN junction on the surface of the battery piece; s2, introducing nitrogen into the diffusion furnace tube, propelling for multiple times, propelling the PN junction into the battery piece, and obtaining the battery piece with the PN junction inside; and S3, placing the battery piece with the PN junction inside in a reaction furnace, and introducing oxygen into the reaction furnace to obtain the battery piece with a protective layer on the surface. The preparation steps are optimized, effective boron doping can be formed without SE laser, the diffusion process provided by the invention is simple, the steps are few, the preparation time is short, the production cost is effectively reduced, the low yield caused by high power control difficulty of the SE laser is avoided, and the production efficiency is improved. The cell prepared by the diffusion process provided by the invention is good in doping effect, and the photoelectric conversion efficiency of the cell is high.

The invention discloses a method for preparing a negative electrode material for a lithium ion battery, which belongs to the technical field of lithium ion batteries and comprises the following steps: mixing LiF with hydrochloric acid and heating the mixture, and then adding Ti into the solution. 3 AlC 2 After the material is mixed, it is magnetically stirred to obtain a mixed solution. The mixed solution is centrifuged and washed, and LiCl solution is added. After standing, it is centrifuged again. After the centrifugation is completed, the lower layer of precipitation is taken out, and the sample is freeze-dried to obtain a sample MXene powder. The prepared sample MXene powder is stirred with water, and then BiCl is added. 3 The test solution was stirred continuously, and after being mixed evenly, it was filtered to form a film, and after drying, a MXene composite film was obtained. The MXene composite film was placed in NaBH 4 The solution is reacted, and after the reaction, the MXene / Bi composite material is obtained by drying. 3 and NaBH 4 The reaction displaces Bi nanoparticles distributed on the surface of MXene nanosheets, forming a relatively stable three-dimensional structure, which provides more attachment sites for Li storage. The presence of Bi improves the lithium storage performance of MXene.

The application provides a UN-U3Si2 composite pellet sintering method based on spark plasma sintering, which comprises the following steps: crushing and ball-milling U3Si2 ingots to obtain U3Si2 powder; preparing UN powder; respectively weighing UN powder and U3Si2 powder in a set mass ratio in an inert gas glove box and uniformly mixing; pre-pressing the mixed powder into a graphite mold; taking out the graphite mold containing the UN-U3Si2 mixed powder from the glove box after pre-pressing; and densifying the UN-U3Si2 mixed powder through spark plasma sintering to prepare UN-U3Si2 two-phase composite fuel pellets. The UN-U3Si2 composite fuel pellets are rapidly densified through the spark plasma sintering process.

The present invention discloses a carbon matrix composite vanadium nitride nanoarray and a preparation method therefor and use thereof. The preparation method includes the following steps: dissolve vanadium pentoxide into an organic solvent to obtain a mixed solution; place a carbon matrix into the mixed solution to undergo a solvothermal reaction and wash and dry a product of the reaction to obtain a precursor; and heat and calcine the precursor in an ammonia atmosphere to obtain the carbon matrix composite vanadium nitride nanoarray. The present invention provides a composite structure of vanadium nitride nanoparticles and a three-dimensional flexible carbon matrix, which can effectively alleviate the volume change generated during an electrode reaction process, significantly improve the cycle life of the battery, provide excellent electrochemical performance, and enhance the charge-discharge efficiency.

This invention discloses a method for preparing interface-reinforced niobium pentoxide / porous graphene and its energy storage application. The method involves adding porous graphene oxide during the solvothermal synthesis of a niobium pentoxide precursor to obtain a composite precursor of niobium pentoxide and porous graphene oxide. This precursor is then annealed under a protective atmosphere to obtain the interface-reinforced niobium pentoxide / porous graphene composite material. The composite material obtained by this invention exhibits excellent performance as an electrochemical energy storage material. Furthermore, the preparation method of this invention is simple to operate, requires no complex equipment, and is easily controlled, making it suitable for mass production.

The invention relates to a nanocellulose diaphragm with reversible thermal hole-closing performance and a preparation method and application thereof, the diaphragm is a single-layer or multi-layer structure composite membrane, and comprises a composite layer with a reversible thermal hole-closing function and a nanocellulose membrane; wherein the composite layer is obtained by in-situ compounding of a thermal reversible material and nanocellulose. Compared with a traditional polyolefin diaphragm and an irreversible thermal closed pore diaphragm, the diaphragm provided by the invention not only has the characteristics of natural three-dimensional nano-network pore structure, good thermal stability, high liquid absorption rate, high ion transmission and conductivity and the like, but also has reversible thermal closed pore thermal runaway prevention and selectable flame retardant functions; the safety of the lithium battery is greatly ensured, and the lithium battery has a good market application prospect.

The invention discloses a magnesium hydride film and a preparation method and application thereof, and the preparation method comprises the following steps: step 1, coating a heptane solution of dibutyl magnesium on a substrate after ultrasonic cleaning, and regulating and controlling the thickness of the MgH2 film; 2, vacuum drying is carried out, and dibutyl magnesium loaded on the substrate is obtained; and 3, hydrogen with the pressure of 6-9 MPa is introduced into the product obtained in the step 2, the temperature is increased to 200-350 DEG C for hydrogen absorption, and the MgH2 thin film coated on the substrate is obtained. In the first step, the substrate is a silicon wafer, glass or aluminum foil. The substrate is subjected to ultrasonic cleaning in an ethanol solution, and the mass fraction of the ethanol solution is 20-80%; and the concentration of the heptane solution of dibutyl magnesium is 0.1-5.0 M / L. The coating frequency is 2-3 times. The thickness of the MgH2 film is regulated and controlled by changing the concentration of the dibutyl magnesium solution and increasing and decreasing the coating times. According to the method, the requirement for equipment for preparing the MgH2 thin film can be lowered, and the preparation efficiency is improved.