702 results about "Argon atmosphere" patented technology

The invention provides a high-stability lithium-rich manganese-based positive electrode material and a preparation method thereof, and relates to the technical field of lithium-rich manganese-based positive electrode materials, and the method comprises three steps of preparation of a homogeneous precursor, solid-state mechanical fusion doping and coating, and high-temperature sintering; a lithium-rich manganese-based precursor is prepared by adopting a homogeneous coprecipitation process, uniform distribution of metal ions is ensured, then an aluminum source, a zirconium source and a fluorine source are introduced as doping agents, phosphate and a titanate coating agent are combined, doping and coating integrated treatment is realized through mechanical ball milling, and the lithium-rich manganese-based composite material is obtained. And finally, mixing with a lithium source in an argon atmosphere, and carrying out high-temperature sintering of temperature programming and staged heat preservation to form a stable composite coating layer in situ. Therefore, manganese ion migration is effectively inhibited through lattice doping, a layered structure is prevented from being converted into spinel or rock salt phase, meanwhile, a nanoscale ion / electron transmission channel is constructed, interface impedance is reduced, and the charging and discharging efficiency under high voltage is improved.

The invention belongs to the technical field of superfine tungsten powder, and particularly relates to superfine tungsten powder and a preparation method thereof.The preparation method includes the steps that an ammonium tungstate solution, hydrochloric acid and carbon black serve as raw materials to prepare a mixture of tungstic acid and a carbon precursor; calcining the tungstic acid and carbon precursor mixture in a nitrogen atmosphere to obtain a tungsten oxide and carbon mixture; a tungsten oxide and carbon mixture is calcined in an argon atmosphere, the argon atmosphere is kept for natural cooling, the superfine tungsten powder is obtained, the superfine tungsten powder is uniform in dispersion, complete in grain development, smooth in surface, free of pores and complex in morphology, the crystal structure of the superfine tungsten powder is a body-centered cube, the average particle size is smaller than or equal to 0.7 micrometer, and the specific surface area is smaller than or equal to 1.0 m < 2 > / g.

The invention relates to the technical field of resource circulation and energy storage, in particular to a method for preparing an iron-silicon-copper alloy phase change energy storage capsule by utilizing organic silicon waste contact bodies, which comprises the following steps: S1, roasting the waste contact bodies in an argon atmosphere to remove organic matters in the waste contact bodies; s2, mixing with iron powder and copper powder; s3, alloying treatment is carried out; s4, performing grinding treatment and screening to obtain silicon slag powder; s5, uniformly mixing with a certain amount of MgO and Al2O3 powder and a caking agent, adding water, and stirring to pulpify the powder; s6, injecting into a mold, pressing to obtain a capsule main body and a capsule cover, and pre-sintering after demolding; s7, the alloy powder is packaged in a capsule shell, and a gap between the capsule shell and a capsule cover is filled with the slurry in the step S5; s8, performing high-temperature sintering and sealing treatment on the capsule; synergistic recycling of silicon and copper resources and industrial silicon slag in the waste contact body is achieved, and the energy storage capsule prepared through the technology has the high phase change temperature and energy storage density and can be widely applied to the field of high-temperature energy storage.

The invention discloses a carbon-doped titanium dioxide nanotube-molybdenum disulfide energy-storage antibacterial material and a preparation method thereof. The preparation method comprises the following steps: carrying out primary anodic oxidation on a clean titanium foil in a mixed electrolyte of ethylene glycol, water and ammonium fluoride; after ultrasonic treatment is carried out in a hydrochloric acid solution for set time, secondary anodic oxidation is carried out, and the mixed electrolyte of the secondary anodic oxidation is the same as that of the primary anodic oxidation; annealing the titanium foil subjected to anodic oxidation twice in an argon atmosphere, putting an annealed sample into a mixed solution of sodium molybdate, a sulfur source and glucose, and carrying out hydrothermal treatment; and the titanium foil subjected to hydro-thermal treatment is cleaned and dried, and the carbon-doped titanium dioxide titanium foil with the surface covered with molybdenum disulfide is obtained. The MoS2-coated carbon-doped titanium dioxide nanotube (TNT-C-atMoS2) with high biocompatibility developed by the invention has a synergistic effect of charge antibiosis and chemical sterilization, so that the problem of intractable biological fouling of a titanium-based metal material in ocean engineering equipment is effectively solved.

The invention discloses a preparation method and application of a high-capacity starch-based sodium ion hard carbon negative electrode material. The preparation method comprises the following steps: adding maleic anhydride and zinc chloride into starch, uniformly mixing, putting into a crucible, putting into a drying oven of 50-100 DEG C for esterification treatment, then heating to 240-280 DEG C for pre-carbonization treatment, and collecting a precursor solid; crushing the precursor solid, putting the crushed precursor solid into a ball milling tank, and carrying out ball milling to obtain intermediate powder; and putting the intermediate powder into a graphite boat, putting the graphite boat into a tubular furnace, and performing high-temperature carbonization in an argon atmosphere to obtain the starch-based sodium ion hard carbon negative electrode material. According to the starch-based sodium ion hard carbon prepared through joint modification of maleic anhydride and zinc chloride, the interlayer spacing is remarkably increased, the oxygen content of the material is reduced, and the disorder degree, the number of closed pores and the volume are increased. The method is simple and convenient in operation steps and has the potential of large-scale production.

The invention discloses a preparation method of a photocatalytic ferroelectric heterojunction with a photothermal-pyroelectric effect, which comprises the following steps: step 1, preparing carboxylated BaTiO3 nanoparticles (BaTiO3NPs), adding a carboxylic acid modified ferroelectric material and a metal salt solution into a mixed solution of H2O and ethanol, and stirring to obtain a mixed solution; wherein the ferroelectric material is BaTiO3NPs, and the metal salt is In (NO3) 3.4 H2O; 2, adding a mixed solution of ammonia water and an ethanol solution into the mixed solution, reacting in an oil bath at 80 DEG C for 30 minutes, carrying out centrifugal washing and drying to obtain BaTiO3 / In (OH) 3, and carrying out high-temperature calcination in a muffle furnace to obtain a BaTiO3 / In2O3 heterojunction; and step 3, grinding the obtained BaTiO3 / In2O3 and NaBH4 according to a ratio, uniformly mixing the obtained BaTiO3 / In2O3 and NaBH4, and roasting the obtained mixture in a tubular furnace in an argon atmosphere to obtain the black BaTiO3 / B-In2O3 heterojunction. A semiconductor material with photo-thermal conversion performance is combined with a pyroelectric material, so that the prepared heterojunction has relatively high photocatalytic reduction activity, and the catalytic efficiency is improved.

The application discloses a kind of derived biomass hard carbon material pulverization process, belong to biomass charcoal material processing technical field, first, pulverization process includes the following steps: after drying, the coconut shell derived hard carbon block is carried out primary crushing, while spraying first modifier, obtain the particle size 1~3mm of coarse crushing modified particle;Coarse crushing modified particle is carried out secondary precision crushing under argon atmosphere, while spraying second modifier, obtain the precision crushing modified particle of D 50 Particle size is 15 μm;Precision crushing modified particle is carried out roll grinding spheroidization, while spraying third modifier, obtain the spherical modified particle of D 50 Particle size is 10 μm;Spherical modified particle is carried out flash drying after cooling, then add magnesium stearate to it, after mixing, obtain derived biomass hard carbon material.Then, the application realizes breakthrough in tap density, particle size distribution, first efficiency and other core indexes by the coordination of three-stage gradient modification and progressive pulverization process.

The invention discloses preparation of a high-performance carbon matrix embedded iron-based catalyst based on a metal organic framework precursor and application of the high-performance carbon matrix embedded iron-based catalyst in reverse water-gas shift reaction. In the preparation process, commercially available 1, 3, 5-trimesic acid iron (the chemical formula is C9H3FeO6, abbreviated as Fe-BTC) is selected as a raw material, pyrolysis treatment is carried out in an argon atmosphere, then air passivation is carried out, and finally the high-performance carbon matrix embedded iron-based catalyst based on the metal organic framework precursor is successfully prepared. The MOF-600 has excellent performance in many catalysts, the carbon dioxide production rate reaches 24.0 mmol CO.gcat <-1 >. S <-1 > at the temperature of 400 DEG C in a reverse water gas shift reaction, the performance is remarkably superior to that of an existing non-noble metal catalyst, and extremely high catalytic efficiency and application potential are shown.

The invention discloses a high-entropy alloy system high-temperature brazing filler metal and a preparation method and application thereof, and relates to the technical field of welding materials.The preparation method comprises the following steps that iron powder, cobalt powder, nickel powder, copper powder and molybdenum powder are weighed and evenly mixed, and mixed metal powder is obtained; the mixed metal powder is put into a first ball milling tank, argon is introduced, ball milling is conducted for at least 15 h, and alloyed powder is obtained; the alloyed powder is put into a mold and sintered in the hydrogen atmosphere at the temperature of 1000-1200 DEG C, and a sintered blank is obtained; the sintered briquette is crushed into particles, the particles are put into a second ball milling tank, ball milling is conducted for at least 20 h in the argon atmosphere, and high-entropy alloy powder is obtained; and weighing the high-entropy alloy powder, borax and polyvinyl alcohol, and uniformly mixing to obtain the high-entropy alloy system high-temperature brazing filler metal. The prepared high-entropy alloy system high-temperature brazing filler metal has the advantages of being good in component uniformity, high in performance stability and excellent in wettability and filling performance, and the welding quality of a brazed joint can be effectively guaranteed.

The invention discloses a sintering method of a composite SiC aluminum oxide electrostatic chuck ceramic plate, and belongs to the technical field of electrostatic chucks, the sintering method comprises the following steps: S1, modification and pre-oxidation treatment modification: controlling the residual amount of carbon black in reaction in the process of synthesizing silicon carbide to obtain nano silicon carbide powder with different carbon contents; pre-oxidizing, namely pre-oxidizing the modified silicon carbide, and then annealing and crystallizing under the protection of argon atmosphere; s2, tape casting: carrying out ball milling on the modified nano silicon carbide in a bedroom sand mill, pre-grinding the ball-milled nano silicon carbide powder, a solvent and a dispersing agent in a planetary mill, then mixing and grinding with aluminum oxide powder, finally adding an adhesive for grinding, and carrying out tape casting after grinding to obtain a ceramic green body; and S3, high-temperature sintering is carried out, specifically, a ceramic green body obtained through tape casting is subjected to glue discharging in wet nitrogen, pressurized sintering is carried out in a certain Ar atmosphere in an HP furnace, and the composite SiC aluminum oxide electrostatic chuck ceramic disc is obtained through sintering.

The invention discloses a modified metal oxide catalyst and a plasma coupling electro-catalysis ammonia synthesis system based on the catalyst, cobalt oxide is modified by using radio frequency inductively coupled plasma (ICP) under a vacuum condition and an argon atmosphere, and the cobalt oxide catalyst rich in defects is obtained after discharging is finished. The ammonia synthesis system comprises a plasma activated air system and an electrocatalytic ammonia synthesis system; carrying out plasma discharge on air to generate NOX, cooling, and introducing the NOX into the absorption liquid; the absorption liquid is used as catholyte for electrocatalytic ammonia production in an H-shaped pool, and a cobalt oxide catalyst modified by plasma treatment is selected as a cathode. The cobalt oxide is treated by ICP, so that the problems of low conductivity, inert surface and the like of metal oxide are solved, and the performance of the catalyst is improved. The method solves the problems that plasma air discharge products are complex, and the ammonia yield is low due to the fact that N is equivalent to N cannot be efficiently activated through electro-catalysis.

The present invention provides an anthracite-based nitrogen-doped carbon material and a preparation method and application thereof. The following steps are included: a. The crushed and screened anthracite and graphite phase carbon nitride are mixed uniformly by mechanical ball milling in a mass ratio of (5-1): 1 to obtain a mixture; b. The mixture is placed in a vacuum tube furnace, heated to 400-700°C in an argon atmosphere, and pyrolysis pretreatment is performed to obtain a pretreated mixture; c. After the pretreated mixture is cooled to room temperature, it is heated to 1000-1400°C in an argon atmosphere, and high-temperature carbonization is performed to obtain anthracite-based nitrogen-doped carbon material. The carbon material prepared by the present invention has low cost, easy raw materials, strong conductivity, stable structure, and can effectively improve the electrochemical performance of sodium ion batteries. At the same time, the present invention also provides a sodium ion battery based on anthracite-based nitrogen-doped carbon material as a negative electrode material, which exhibits a higher reversible specific capacity and superior cycle performance and rate performance.

The invention discloses a liquid metal-hydrogel composite radiation protection material and a preparation method and application thereof.The preparation method comprises the steps that indium, tin and bismuth are sequentially put into a flask from low melting point to high melting point to be mixed, and glycerin is added for immersion; placing the mixture in an argon atmosphere, and stirring by using a heating type magnetic stirrer; taking out the spherical liquid metal particles from the glycerol, and finally washing and drying to obtain liquid metal alloy particles; preparing a PVA (polyvinyl alcohol)-H2O solution with the mass fraction of 15% and a PVA-DMSO (dimethyl sulfoxide) solution with the mass fraction of 15%; and a PVA-H2O solution, a PVA-DMSO solution and the liquid metal alloy particles are stirred and mixed according to the mass ratio, the mixed solution is subjected to ultrasonic treatment and then poured into a mold to be frozen into gel, and the liquid metal-hydrogel composite material is obtained. By combining the advantages of the liquid metal and the hydrogel, excellent biocompatibility, adjustable mechanical property and efficient radiation shielding capability are realized, and the hydrogel can be used as a novel lead-free radiation protection material.

The invention discloses a wafer-level single-layer MoS2 continuous film and an APCVD film forming method and application thereof.The wafer-level single-layer MoS2 continuous film is obtained by adopting a pipe-in-pipe APCVD tubular furnace, and conducting in-situ annealing on a C-A face sapphire substrate in the mixed atmosphere of oxygen and argon before the MoS2 continuous film grows; then the sulfur powder and the C-A surface sapphire substrate are heated at the same time in the mixed atmosphere of argon and hydrogen, the molybdenum trioxide powder is heated at the same time in the argon atmosphere, the wafer-level MoS2 continuous thin film of a single-layer structure is successfully prepared, and the technical problem that in the prior art, the wafer-level single-layer MoS2 thin film prepared through an APCVD method is discontinuous is solved. The wafer-level single-layer MoS2 continuous film prepared by the method has the characteristics of high quality and good uniformity, and is beneficial to large-scale integration and application of two-dimensional electronic devices.

The invention relates to a carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction, a catalyst, a preparation method and application thereof, and the scheme is innovated by the following steps: dipping conductive carbon black (such as ketjen black ECP600JD) and 60-70wt% phosphoric acid solution according to a solid-to-liquid ratio of 1g / (15-18) mL, preheating at 100-250 DEG C in an argon atmosphere, then carrying out a reaction for 10-100 seconds under the assistance of a microwave power of 100-600 W, and carrying out vacuum drying to obtain the carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction. The phosphorus content of the prepared carbon carrier material is 4-6wt%, and the graphitization degree of the carbon carrier material is improved (ID / IG value is 1.15-1.20). And after the platinum-cobalt alloy is further loaded, the particle size of the nanoparticles is uniform, the potential loss is only 3 mV after 5000 accelerated attenuation tests in the proton exchange membrane fuel cell, and the power density attenuation is reduced by 58%. The method has the advantages of quick reaction, low energy consumption, high corrosion resistance and the like, and the stability of the catalyst is remarkably improved.

The invention relates to the field of photomultiplier tube processing, and discloses an antimony bead evaporation source quantitative founding device and method, the antimony bead evaporation source quantitative founding device comprises a founding tool and a vacuum system connected with a bell jar above the device, the founding tool is provided with a groove for accommodating antimony powder, and quantitative founding of antimony beads of different specifications is realized by controlling the volume of the antimony powder groove; the melting tool is used for heating antimony powder through a heating part at the bottom of the melting tool; the exterior of the melting tool is evenly wound with a nickel wire, and the invention further discloses an antimony bead evaporation source quantitative melting method which comprises the following steps that S1, the nickel wire is wound and fixed, specifically, the purified nickel wire is evenly wound on the melting tool, and the nickel wire is fixed to the middle position of an antimony powder groove through a wire groove. The antimony powder is degassed and purified in a high-vacuum state, the antimony beads are molten in a high-purity argon atmosphere, the purity of an antimony bead evaporation source is guaranteed, in addition, the antimony powder quantitative loading tool is adopted, and the antimony beads are produced in batches with high specification consistency.

The invention discloses high-flexibility low-reflection flexible photovoltaic glass and a preparation method thereof, and belongs to the technical field of photovoltaic glass preparation. The preparation method comprises the following steps: carrying out cleaning and plasma activation treatment on a flexible glass substrate in an argon atmosphere at the power of 100W for 5 minutes; spin-coating a perovskite precursor solution and annealing to form an active layer, and depositing a transparent conductive layer and a back electrode; carrying out vacuum lamination packaging by adopting an EVA material; coating an acrylic acid adhesive transition layer; spin-coating ultraviolet cured SiO2 sol to form an inorganic coating; a PVDF / Ag / PVDF sandwich structure is constructed, the coverage rate of the nano-silver is 40-50%, and the PVDF layer contains 0.5% of antioxidant. After the flexible photovoltaic glass is circularly bent for 1000 times under the curvature radius of 5mm, the recovery rate is greater than 95%, the PAR transmittance is greater than 92.5%, the NIR reflectivity is greater than 89.3%, the reflectivity retention rate is greater than 96% after the flexible photovoltaic glass is aged for 100 hours at 85 DEG C / 85% RH, and the flexible photovoltaic glass has excellent flexibility, optical performance and environmental stability.

The invention relates to the technical field of waste resourceful treatment, in particular to a sponge titanium weight bottom skin crushing and impurity removing method which comprises the following steps of peeling, bottom skin brake cutting, water jet cutting and crushing, acid leaching and impurity removing, ultrasonic cleaning, argon drying and screening and recycling. The bottom skin is crushed into small-granularity particles by adopting a cross grid water jet cutting technology, metal impurities such as Fe and Ni are removed in combination with acid leaching treatment, residual impurities are removed through multi-stage ultrasonic cleaning, oxidation discoloration is avoided through argon atmosphere drying, and meanwhile water jet sand is recycled; in the process, key indexes such as brake cutting pressure, cutting parameters, acid leaching time and ultrasonic frequency are accurately controlled through a quantification formula. The method effectively solves the problems that equipment is easy to damage during crushing and impurities are difficult to remove in a traditional process, remarkably improves the grade of bottom leather materials, widens the downstream application range, improves the resource utilization rate and economic benefits, and is suitable for industrial batch production.

The invention relates to the technical field of silicon carbide powder manufacturing, in particular to a high-purity silicon carbide powder synthesis method which comprises the steps that S1, graphite paper or carbon fiber cloth is pasted to a resistance heating material and / or the inner wall of a deposition chamber, and the resistance heating material is connected to an electrode; s2, the pressure in the deposition chamber is adjusted to a vacuum state or replaced with an argon atmosphere, and the temperature is increased to 900-1300 DEG C; s3, methyl trichlorosilane, silicon chloride, hydrogen, argon and hydrocarbon gas are conveyed into the deposition chamber in proportion for deposition for 10-150 h, and a silicon carbide block is obtained; s4, the obtained silicon carbide blocks are sequentially subjected to crushing treatment and cleaning treatment, and silicon carbide powder is obtained; and S5, carrying out high-temperature treatment on the silicon carbide powder to obtain the silicon carbide powder for silicon carbide single crystal growth. The method can improve the production efficiency of the silicon carbide powder and reduce the production cost; the synthesized silicon carbide powder has controllable particle size and high purity.

The invention relates to a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate composite photo-anode and a product and application thereof, and belongs to the technical field of photoelectrocatalysis. The invention discloses a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate (Bi2Mo2O9 / BiVO4) composite photo-anode, which mainly comprises the following steps: immersing a fluorine ion-doped tin dioxide (FTO) conductive glass substrate into a Bi < 3 + > ion solution and an I <-> ion solution to form a bismuth oxyiodide (BiOI) film, dropwise adding a dimethyl sulfoxide solution of vanadyl acetylacetonate (VO (acac) 2), and putting into a muffle furnace to prepare the BiVO4 photo-anode. And then vertically immersing into a Bi < 3 + > ion solution and a Mo < 6 + > ion solution, and carrying out annealing treatment in an argon atmosphere to prepare the Bi2Mo2O9 / BiVO4 composite photoanode rich in oxygen vacancies. The Bi2Mo2O9 / BiVO4 material rich in oxygen vacancies is a metal oxide composite photo-anode, the photoelectrocatalysis efficiency can be improved, and hydrogen peroxide (H2O2) can be continuously generated in natural seawater through photoelectrocatalytic oxidation of water for a long time.

The invention discloses a method for preparing (SmxY1-x) Co5 rare earth magnetic particles with high magnetic properties by a chemical method, and belongs to the field of rare earth magnetic materials. The invention particularly relates to a novel technology for preparing (SmxY1-x) Co5 ternary alloy magnetic powder with high magnetic properties by combining chemical liquid phase synthesis with calcium reduction reaction. A Sm (OH) 3 / Y (OH) 3 / Co (OH) 2 (at) Ca (OH) 2 crystalline state mixed precursor prepared by chemical coprecipitation and a hydrothermal reaction is uniformly subjected to a complete calcium reduction reaction with a certain amount of metal calcium particles, KCl and CaCl2 diffusion media in an argon atmosphere, and the magnetic powder is prepared. The saturation magnetization intensity and the residual magnetization intensity of the magnetic powder are improved by doping the yttrium element, but the coercive force of the magnetic powder is slightly reduced, and the method provides a new thought for preparing high-performance rare earth magnetic particles.

The invention discloses a catalysis-high temperature synergistic preparation method of a lignin-based electromagnetic shielding carbon material, which comprises the following steps: carbonizing lignin, dipping in an aqueous solution containing Mn < 2 + > overnight, drying, carrying out graphitization reaction in an argon atmosphere, and cooling to obtain a final product. After lignin pyrolytic carbon is impregnated with Mn < 2 + >, growth of graphite microcrystals is promoted through cooperation of the catalytic graphitization effect and the high-temperature effect of Mn under a certain temperature condition, finally, the temperature is further increased, Mn is gasified and removed while the graphitization degree is increased, and follow-up acid pickling operation is avoided. The shielding effectiveness of the obtained product on electromagnetic waves with the wave band of 1-8.5 GHz can be close to 40 dB, the medium shielding performance is achieved, and the good application prospect is achieved.

The invention discloses an all-chemical vapor deposition preparation method of a carbon-carbon heater with the density of 1.6-1.8 g / cm < 3 >, and belongs to the technical field of carbon-carbon heater preparation. The scheme comprises the following steps: 1) preparing a carbon fiber preform with the volume density of 0.5 + / -0.03 g / cm < 3 > by adopting a needling process; 2) taking natural gas as a carbon source, taking low-molecular mixed hydrocarbon gas as auxiliary gas, and performing densification treatment on the carbon fiber preform by adopting an all-chemical vapor deposition method in a nitrogen or argon atmosphere; and (3) carrying out high-temperature graphitization treatment on the densified preform, and sleeving a graphite tool into the heater for fixing in the treatment process, so as to prepare the carbon-carbon heater with the density of 1.6-1.8 g / cm < 3 >. The carbon-carbon heater prepared by the preparation method has the characteristics of stable heat supply, no resistance fluctuation, good corrosion resistance, long service life, short preparation period and the like.

The invention discloses a press-fit preparation method of a high-thermal-conductivity circuit board and the high-thermal-conductivity circuit board, and the preparation method comprises the steps: carrying out the dispersion and solidification of a liquid metal gallium-indium alloy and fiber mixture in an inert argon atmosphere, and fusing with a substrate, and obtaining a self-adaptive heat-conduction substrate; carrying out gradient deposition and etching treatment on the self-adaptive heat conduction base material to obtain a gradient spacing template; carrying out electrospinning infiltration and heat treatment on the gradient spacing template to obtain a base material containing a dynamic heat-conducting network; conducting layer pre-pressing treatment is conducted on the base material containing the dynamic heat conduction network, and a pre-assembled plate is obtained; performing staged dynamic pressing treatment on the pre-assembled board to obtain a molded circuit board; and performing surface spraying and deposition treatment on the molded circuit board to obtain the high-thermal-conductivity circuit board. The problems of poor heat flow path, poor interface bonding performance and the like in the prior art are solved, the heat management effect is remarkably improved, and the reliability and performance of an electronic product are remarkably improved.

The invention relates to the technical field of environmental pollutant degradation and discloses a high-entropy alloy sulfide as well as a preparation method and application thereof. The metal elements in the high-entropy alloy sulfide are any five of molybdenum, iron, manganese, nickel, zinc and cobalt; according to the method, molybdenum disulfide, ferrous sulfide, manganese sulfide, trinickel disulfide, zinc sulfide and cobalt sulfide are used as raw materials, and the high-entropy alloy sulfide is prepared in one step through ball milling under the protection of argon atmosphere. The high-entropy alloy sulfide is mainly used for activating peroxymonosulfate to degrade organic pollutants in an aqueous solution. Experimental comparison shows that compared with a monometal sulfide, the high-entropy alloy sulfide prepared by the preparation method disclosed by the invention shows more efficient degradation capability on organic pollutants in an aqueous solution when cooperating with peroxymonosulfate. The preparation method disclosed by the invention is simple to operate, mild in reaction condition and capable of realizing large-scale production.

The preparation method of the Ni-Mn bimetallic oxide modified magnesium-based hydrogen storage composite material comprises the steps that 1, under the protection of an argon atmosphere, pure magnesium powder is placed in a reaction kettle, and a product MgH2 is obtained; step 2, dissolving nickel nitrate hydrate and manganous nitrate hydrate in absolute ethyl alcohol, adding urea into the mixed solution, continuously stirring at room temperature, and then carrying out constant-temperature reaction in a tetrafluoropolyvinyl chloride high-pressure reaction kettle in a drying oven; after the reaction is finished, cooling to room temperature, and carrying out centrifugal washing; supernate obtained after centrifugal washing is poured out, precipitates are reserved and transferred into a vacuum drying box, and vacuum drying is conducted; grinding a block obtained after drying, and transferring the block into a tubular furnace for heat treatment to obtain a bimetallic oxide NiMn2O4; 3, MgH2, NiMn2O4 and stainless steel ball milling beads are weighed and put into a mechanochemical reaction ball milling kettle, intermittent ball milling is conducted for a certain time under the protection of a specific atmosphere, and then a composite sample MgH2-NiMn2O4 is collected. The practical application benefit of the magnesium-based hydrogen storage technology can be greatly improved.

A nickel iron phosphide / nickel molybdate core-shell structure composite electrode material, the nickel iron phosphide / nickel molybdate core-shell structure composite electrode has a nickel foam substrate, and the nickel foam substrate has an array of nickel iron phosphide / nickel molybdate core-shell structure. The present invention also relates to a preparation method of the electrode, comprising the following steps: first pre-treating the nickel foam substrate to remove oxides and impurities on the surface of the nickel foam substrate; placing the nickel foam in a reactor for hydrothermal treatment by an in-situ growth method to obtain a nickel molybdate precursor with a cubic array structure; then placing the nickel molybdate precursor in a potassium ferrocyanide solution for ion exchange to obtain a nickel iron Prussian blue / nickel molybdate composite electrode; finally, placing the nickel iron Prussian blue / nickel molybdate composite electrode in a tubular furnace, phosphating under an argon atmosphere, and obtaining a nickel iron phosphide / nickel molybdate core-shell structure composite electrode. The preparation method of the present invention is simple, and the prepared nickel iron phosphide / nickel molybdate core-shell structure composite electrode has significantly improved electrochemical performance and stability compared with a single phosphide electrode.

The invention discloses a ZnF2 (at) FeF3. 0.33 H2O positive electrode material as well as a preparation method and application of the ZnF2 (at) FeF3. 0.33 H2O positive electrode material. The preparation method comprises the following steps: step 1, uniformly mixing ethanol and PEG-400 to obtain a mixed solvent; 2, ferric nitrate and zinc nitrate are dissolved in a mixed solvent, then an HF aqueous solution is dropwise added into the obtained solution under stirring, after stirring, the obtained mixed solution is transferred into a stainless steel high-pressure kettle to be heated in a closed mode and cooled to the room temperature, a product is washed, centrifuged and dried in vacuum, and powder is obtained; 3, the powder is placed in a tubular furnace and subjected to heat preservation treatment in the argon atmosphere, then the powder is naturally cooled to the room temperature, a product is taken out and ground, and the ZnF2-coated FeF3. 333 H2O material is obtained. By doping ZnF2, FeF3. 0.33 H2O has higher electronic conductivity and a more stable structure, and an all-solid-state lithium battery prepared from the FeF3. 0.33 H2O has higher specific capacity and better cycling stability.

The invention relates to the technical field of electrolyzed water catalytic electrodes, in particular to a bifunctional electrolyzed water catalytic electrode with carbonized wood as a substrate and a preparation method and application thereof.The preparation method comprises the steps that 1, wood chips are cleaned and then placed in a tubular furnace to be carbonized at the high temperature in the argon atmosphere, and three-dimensional porous carbonized wood is obtained; 2) dispersing a nickel source, an iron source and a molybdenum source in a solvent, magnetically stirring to obtain a mixed solution, and adding sodium citrate dehydrate to adjust the pH value of the solution to 7; (3) transferring the carbonized wood and the mixed solution into a high-pressure reaction kettle, and carrying out hydrothermal reaction at 160 DEG C; and 4) placing the obtained sample in a tubular furnace for gas phase phosphorization, then repeatedly washing with deionized water and absolute ethyl alcohol, and carrying out vacuum drying to obtain the three-dimensional porous self-supporting framework uniformly and firmly loaded nickel iron molybdenum phosphide difunctional water electrolysis catalytic electrode, the combination of the framework and particles enables the catalytic electrode to have excellent HER and OER electro-catalytic performance and stability, and the catalytic electrode has good application prospects. And the preparation method is simple, efficient, low in cost and suitable for large-scale production and application.

The invention relates to a memristor based on a molybdenum-doped vanadium dioxide phase change thin film material and a preparation method of the memristor, an amorphous molybdenum-doped vanadium dioxide phase change thin film material is prepared on a Si-based substrate through co-sputtering, annealing is carried out for 30-60 minutes in a high-purity argon atmosphere at 400-450 DEG C, and a high-quality MoxV1-xO2 thin film is obtained. The invention further provides a preparation method of the memristor based on the molybdenum-doped vanadium dioxide phase change film. The memristor structurally comprises a substrate layer, a functional layer and a top electrode layer. The prepared molybdenum-doped vanadium dioxide film shows excellent thermal stability, a wide thermal hysteresis interval and a low phase transition temperature. By using the MoxV1-xO2 material as the functional layer of the memristor, the device has the advantages of small size, low turn-on voltage, high room temperature stability and the like.