34results about How to "Avoid overgrowth" patented technology

The invention relates to the technical field of wastewater treatment, in particular to a hydrolytic acidification wastewater treatment process for strengthening extracellular electron transfer, which comprises the following steps: S1, constructing a hydrolytic acidification reactor, taking carbon fiber suspension filler as an anode, taking a steel wire mesh frame as a cathode, connecting the carbon fiber suspension filler in series by a stainless steel wire rope, and taking the stainless steel wire rope as a cathode; the carbon fiber suspension filler is connected with the steel wire mesh frame through an electrochemical workstation; s2, inoculating hydrolytic acidification bacteria into a reactor, controlling culture conditions, and domesticating microorganisms in a micro-current environment until a biological membrane is formed on the carbon fiber suspension filler; s3, inputting wastewater to be treated into the reactor, controlling treatment conditions, monitoring an effluent result, and discharging after the effluent result reaches the standard. Compared with traditional interspecific electron transfer, the wastewater treatment method has higher efficiency and speed, the oxygenolysis process of organic matter is accelerated, and the overall efficiency of wastewater treatment is improved.

The invention relates to a metal additive modified Pt-loaded CeO2 catalyst, preparation and application thereof in CO oxidation, and belongs to the technical field of industrial catalysis. The preparation process of the catalyst mainly comprises the following steps: respectively dissolving cerium salt, platinum salt and auxiliary metal salt in deionized water to prepare corresponding precursor solutions; then, mixing the three solutions, and dropwise adding ammonia water under a stirring condition until yellow precipitates are generated; and finally, drying and washing the precipitate, and calcining the solid powder in a proper atmosphere to obtain the assistant metal modified Pt / CeO2 catalyst. La, Pr, Nd or Sm auxiliary metal is introduced into the Pt / CeO2 catalyst, so that the CO catalytic oxidation performance of the catalyst can be improved, and the poisoning resistance of the catalyst in an SO2-containing environment can be enhanced. The method has important significance in the actual industrial application, especially in the catalytic oxidation process under the condition of treating complex flue gas.

The invention discloses in-situ carbon-coated cobalt-doped lithium manganese iron phosphate and a preparation method thereof.The preparation method comprises the steps that a metal-organic framework precursor FexMn1-x-yCoy-MOF is prepared, x is larger than 0 and smaller than 1, y is larger than 0 and smaller than 0.01, then the metal-organic framework precursor is mixed with a lithium source and a phosphorus source, grinding treatment and spray drying are conducted, and the in-situ carbon-coated cobalt-doped lithium manganese iron phosphate is obtained. And calcining in an inert atmosphere to obtain the in-situ carbon-coated cobalt-doped lithium manganese iron phosphate. Uniform Co doping is formed in situ on a lithium manganese iron phosphate crystal lattice, the Co element can occupy the Fe site or Mn site in lithium manganese iron phosphate, the Co element can catalyze an organic ligand to form a high-conductivity carbon nanotube in situ in the sintering process, the high-conductivity carbon nanotube is interspersed on the surface of an in-situ carbon-coated lithium manganese iron phosphate particle, and the high-conductivity carbon nanotube and the in-situ carbon-coated lithium manganese iron phosphate particle have a synergistic effect; meanwhile, the conductivity, the stability and the compaction density of the material are improved.

The invention provides a preparation method of a lithium iron phosphate carbon-coated material, and belongs to the technical field of energy materials, and the preparation method comprises the following steps: mixing a lithium source, a phosphorus source, an iron source and a solid carbon source, adding water, mixing, grinding to obtain slurry, drying, sintering, cooling and crushing the slurry to obtain primary coated lithium iron phosphate powder; and grinding the primary coated lithium iron phosphate powder, introducing acetylene for secondary sintering, and cooling to obtain the secondary coated lithium iron phosphate carbon coated material. A uniform thin shell is formed on the surface of a lithium iron phosphate crystal by coating a carbon layer twice, so that the direct contact between the lithium iron phosphate crystal surface and an electrolyte can be avoided as much as possible, the dissolution of Fe ions is reduced, and the electronic conductivity of the material is improved; the coated carbon layer can also improve the interface corrosion resistance and promote interface lithium ion diffusion, so that the problems of interface lithium ion transmission and interface side reaction of the lithium iron phosphate material in the prior art are solved, and the cycle performance is improved; and the formed carbon layer can inhibit crystal growth, so that the compaction density of the material is effectively improved.

The present invention relates to a composite probiotic for regulating oral microecological environment and application thereof. The composite probiotic for regulating oral microecological environment comprises inactivated Lactobacillus paracasei with a preservation number of CGMCC No.30464. Lacticaseibacillus paracasei FB97 strain and inactivated Lactobacillus rhamnosus with a deposit number of CGMCC No.31054 Lacticaseibacillus rhamnosus When the RH22 strain is used in combination, the two can cooperate and promote each other, synergizing in promoting the health of the oral microecological environment. Specifically, they have significant effects in inhibiting the growth of harmful oral bacteria, promoting the proliferation of beneficial bacteria, and inhibiting the formation of dental plaque.

This invention relates to the field of hafnium carbide technology and discloses a thermal decomposition preparation process for hafnium carbide precursors. The process includes: dissolving hafnium tetrachloride in anhydrous ethanol, adding propylene oxide dropwise for neutralization and acid removal to obtain a neutral ethanol-hafnium precursor solution; adding ethyl acetoacetate methacrylate and heating for coordination to obtain a hafnium coordination monomer solution; adding acrylonitrile and an initiator and heating for polymerization; when the viscosity of the reaction solution increases, injecting a dimethyl sulfoxide hot solution of melamine as a locking liquid; precipitating, separating, and drying to obtain the hafnium carbide precursor; and after oxidative crosslinking treatment, calcining at high temperature under an inert atmosphere to undergo carbothermic reduction to obtain hafnium carbide powder. This invention achieves molecular-level dispersion of precursor components through liquid-phase coordination and in-situ network locking, effectively reducing the reaction temperature and inhibiting grain agglomeration, thus producing high-purity, ultrafine hafnium carbide powder.

The application discloses a kind of hard carbon negative electrode material and preparation method thereof based on waste lithium battery diaphragm preparation.The hard carbon negative electrode material is prepared by using waste lithium ion battery PP / PE diaphragm as raw material, through raw material pretreatment, composite sulfonation pre-crosslinking, transient joule heat pulse carbonization, pickling purification step, its first charge specific capacity is greater than or equal to 310 mAh / g, first coulomb efficiency is greater than or equal to 90%, 1A / g cycle 500 cycles capacity retention rate is greater than or equal to 90%, and the performance is excellent.The application is coupled by composite sulfonation pre-crosslinking and transient joule heat rapid carbonization, compared with traditional process, energy consumption is reduced, and waste diaphragm is efficiently converted to high-performance hard carbon.

This invention discloses an organocobalt salt for improving the tensile strength of rubber and its preparation method, belonging to the field of rubber technology. The organocobalt salt for improving the tensile strength of rubber comprises, by mass parts, 140-210 parts of organosilicon vegetable fatty acid, 20-30 parts of solvent, 20-30 parts of cobalt hydroxide, and 10-16 parts of propionic acid. The organosilicon vegetable fatty acid is obtained by reacting rosin with organosilicon maleimide. The organosilicon maleimide is obtained by reacting maleic anhydride with a silicon-containing long-chain fatty amine. The silicon-containing long-chain fatty amine is obtained by reacting methyldiethoxysilane with an unsaturated long-chain fatty amine. The organocobalt salt obtained by this invention has a good effect on promoting the adhesion between metal and rubber while effectively improving the tensile strength of rubber.

This invention discloses a method for preparing a graphene / silicon-carbon composite anode material. The method includes: firstly, preparing a carbon-coated silicon dioxide precursor via a hydrothermal reaction; then, converting it into a carbon-coated silicon material using a magnesothermic reduction method in the presence of sodium chloride, effectively inhibiting the aggregation and growth of silicon particles; finally, combining graphene with the carbon-coated silicon material through a secondary hydrothermal and calcination treatment to construct a conductive network. This invention, through a multi-level structural design, utilizes the synergistic buffering effect of the internal carbon layer and the external graphene to effectively alleviate the volume expansion of silicon during charging and discharging, significantly improving the conductivity and structural stability of the material. The prepared composite anode material exhibits high specific capacity and excellent cycle performance, making it suitable for lithium-ion battery applications.

This invention belongs to the field of composite material technology, specifically relating to a method for preparing a high-strength, high-plasticity, and high-toughness multilayer titanium-aluminum composite plate. The steps of this invention include: first, preparing aluminum and titanium plates as raw materials; then, after surface treatment of the raw materials, combining and fixing them; after heat preservation, rolling the fixed plates; and finally, performing solution aging treatment to obtain a multilayer titanium-aluminum composite plate. Through alternating layer design, a three-layer (aluminum-titanium-aluminum), three-layer (titanium-aluminum-titanium), or five-layer (titanium-aluminum-titanium-aluminum-titanium) composite structure is constructed. With a simple preparation process, this invention achieves a significant improvement in plasticity and toughness. This invention provides a low-cost, simple, and mass-producible high-performance composite plate preparation scheme, offering a new material option for lightweight design in aerospace, transportation, and other fields.

The invention discloses a multifunctional photoelectric memristor based on zinc oxide / molybdenum disulfide and a preparation method, the memristor integrates multiple functions of nonvolatile storage, artificial brain-like synapse and wireless communication, and comprises a bottom electrode layer, a resistive function layer and a top electrode layer which are sequentially designed from bottom to top and located on a substrate, the resistive function layer is a heterojunction formed by a zinc oxide film and a molybdenum disulfide film. According to the memristor, the characteristic that molybdenum disulfide inhibits overgrowth of the conductive filaments is utilized, the operation power consumption is reduced, the resistance storage window and the stability are improved, and therefore the performance of the memristor can be remarkably optimized.

The application provides a preparation method of isotropic coke and a product and graphite obtained by the method, and belongs to the technical field of coke material preparation. The preparation method of the isotropic coke comprises the following steps: 1) mixing a water-soluble carbon source, a surfactant and water to obtain an aqueous solution; 2) under physical emulsification conditions, slowly adding an oil phase into the aqueous phase to form an oil-in-water emulsion; and 3) performing a coking reaction on the oil-in-water emulsion obtained in the step 2) to obtain the isotropic coke. The application adopts an oil-in-water emulsion limited coking strategy to control the microtexture of the coke from the source, so that the coke is mainly in the form of small flake isotropic structure, and the defects of poor fast-charging performance and easy cycle attenuation caused by the traditional needle-shaped coke fiber structure are overcome, so that the coke has high capacity, high rate and long cycle life after graphitization.

The application provides a high-capacity and high-rate hard carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion battery negative electrode materials. Specifically, biomass shell raw materials are coarsely broken and sieved to obtain biomass coarse powder; the biomass coarse powder is mixed with an oxidizing agent and then pre-oxidized; mechanical pulverization is performed to obtain biomass coarse powder with a D50 of 8-15 microns; the biomass coarse powder is added into mixed acid and heated in a water bath, and then washed with water until neutral to obtain a purified precursor; and finally, the precursor is subjected to staged high-temperature carbonization in a vacuum carbonization furnace. Through specific process parameters, the prepared hard carbon material has a hierarchical porous structure and a suitable graphite microcrystalline layer spacing, and has a low total content of metal impurities; when applied to a sodium ion battery negative electrode, the hard carbon material exhibits a high reversible specific capacity, a high initial coulombic efficiency, and excellent long cycle stability and rate performance.

The invention relates to the technical field of battery materials, in particular to a preparation method of an alpha-zirconium phosphate coated ternary positive electrode material, which comprises the following steps: S1, dissolving and mixing a zirconium source and a phosphorus source, and then introducing into preparation equipment for gelation reaction to obtain a precursor; wherein the preparation equipment detects the viscosity change of reactants in the gelation reaction process in real time, the gelation reaction process is divided into different stages according to the viscosity change, and the corresponding stirring speed and temperature are adjusted according to the different stages; s2, outputting the precursor obtained in S1 from preparation equipment, washing and drying, and calcining at high temperature for 2-6 hours to obtain the alpha-zirconium phosphate nanosheet; and S3, mixing and ball-milling the alpha-zirconium phosphate nanosheet and the ternary positive electrode material in an ethanol medium, and drying to obtain the alpha-zirconium phosphate coated ternary positive electrode material. According to the preparation method of the alpha-zirconium phosphate coated ternary positive electrode material, provided by the invention, the alpha-zirconium phosphate coated ternary positive electrode material can be simply and quickly obtained, and the preparation method has a good application value.

The invention relates to the technical field of silicon microrods, in particular to a preparation method of a novel synthetic silicon dioxide microrod. According to the technical scheme, the preparation method of the novel synthetic silicon dioxide microrod comprises the following steps: step 1, carrying out surface modification on a carbon nanotube template to enable the surface of the carbon nanotube template to be rich in oxygen-containing functional groups; 2, dispersing the surface-modified carbon nanotube template in a solution containing a surfactant and a silicon source, and carrying out a coating reaction of a silicon dioxide layer to form a core-shell structure; and step 3, removing the internal carbon nanotube template through calcination to obtain a silicon dioxide microrod, and carrying out enhanced ultrasonic acidizing treatment on the carbon nanotube at 80 DEG C for 2 hours by adopting a mixed acid solution of concentrated sulfuric acid and concentrated nitric acid in a specific volume ratio, so that the density and the distribution uniformity of carboxyl and hydroxyl functional groups on the surface of the carbon nanotube are remarkably improved, and the carbon nanotube is prepared. And the problems of coating layer defects and surface roughness caused by insufficient surface modification in the traditional method are effectively overcome.

This invention discloses a method for preparing cubic nano-calcium carbonate based on monosaccharide regulation. Using monosaccharides as crystal guiding agents, the resulting cubic nano-calcium carbonate exhibits a cubic structure with an average particle size of 81-115 nm. The monosaccharide is either glucose or fructose. The preparation method includes the following steps: 1. Preparation of calcium oxide; 2. Preparation of monosaccharide-nano-calcium carbonate. The amount of monosaccharide added is 0.8-1.2 wt.% of the calcium oxide mass; the calcium oxide yield is 65-75%. The resulting nano-calcium carbonate has a whiteness value of 90.6-97.3 wb and an oil absorption value of 65.3-89.6 g DOP / 100 g CaCO3.

The invention belongs to the technical field of traditional Chinese medicine formulas for preventing hair loss and promoting hair growth, and particularly relates to traditional Chinese medicine compound shampoo soap for preventing hair loss and promoting hair growth as well as a preparation method and application of the traditional Chinese medicine compound shampoo soap. The hair-loss-preventing and hair-growing traditional Chinese medicine composition is prepared from 25-35 parts of radix polygoni multiflori preparata, 15-25 parts of radix codonopsis, 15-25 parts of radix sophorae flavescentis, 10-20 parts of black ants, 10-20 parts of radix astragali, 10-20 parts of pericarpium zanthoxyli, 10-20 parts of folium artemisiae argyi, 10-20 parts of fructus liquidambaris, 10-20 parts of fried tribulus terrestris, 10-20 parts of radix angelicae sinensis, 10-20 parts of cortex dictamni and 3-10 parts of resina draconis. The hair-loss-preventing and hair-growing effects can be improved by the hair-loss-preventing and hair-growing traditional Chinese medicine composition.

The invention discloses a method for producing scleroglucan by immobilized continuous fermentation of sclerotium rolfsii, which is characterized in that a large amount of sclerotium rolfsii fixedly grows on a microporous stirring paddle through hyphae through a microporous structure of the microporous stirring paddle, so that scleroglucan is produced by immobilized continuous batch fermentation of sclerotium rolfsii. The sclerotium rolfsii thalli are fixedly adsorbed on the microporous stirring paddle, so that continuous fermentation is realized, waste of the thalli in fermentation is reduced, the fermentation period of the sclerotium rolfsii is shortened, and the production efficiency of scleroglucan is improved. When the method disclosed by the invention is used for producing the scleroglucan through immobilized continuous batch fermentation, the yield of the scleroglucan in the second batch fermentation can still reach 13g / L. Compared with the existing method for producing scleroglucan through batch fermentation, continuous batch fermentation is adopted, excessive growth of sclerotium rolfsii biomass in fermentation liquor and overhigh viscosity of the fermentation liquor are avoided while the scleroglucan is produced, and the cost for separating and purifying the product is reduced.

The invention relates to the technical field of silicon carbide ceramics, and particularly discloses a solid-phase sintered silicon carbide ceramic and a preparation method thereof. The solid-phase sintered silicon carbide ceramic is prepared from the following raw materials in percentage by mass: 86.5 to 92.5 percent of silicon carbide powder, 3 to 6 percent of a carbon source auxiliary agent, 0.2 to 1 percent of a boron source auxiliary agent, 2 to 5 percent of a compound auxiliary agent and 2 to 5 percent of a binder, the silicon carbide powder comprises alpha-silicon carbide and beta-silicon carbide in a mass ratio of 1: (4.5-5); the compound additive comprises zirconium chloride and yttrium chloride in a mass ratio of (1-5): 1. The solid-phase sintered silicon carbide ceramic can be used in the field of high-temperature refractory materials, and has excellent fracture toughness and mechanical properties.

A lithium metal negative electrode, a secondary battery (8), a battery module, a battery pack (4), and an electric apparatus are provided. The lithium metal negative electrode includes a substrate (1), lithium metal (2), and a fiber layer (3). The substrate (1) includes a copper mesh (11). The copper mesh (11) is plated with the lithium metal (2). The copper mesh (11) and the fiber layer (3) are composited. The copper mesh (11) serves as a substrate support structure for supporting the lithium metal (2). In a charge and discharge cycle of a battery, the lithium metal (2) tends to deposit in pores of the copper mesh (11), suppressing overgrowth of lithium dendrites, thereby avoiding the risks such as separator puncture, irreversible capacity loss, or even separator puncture caused by dead lithium formed.

The invention belongs to the technical field of nanocrystalline hard alloy, and discloses tungsten carbide-based nanocrystalline hard alloy and a preparation method thereof. The preparation method comprises the following steps that tungsten carbide powder is put into a modified solution containing soluble cobalt salt and soluble lanthanide series metal salt to be soaked, solid matter is collected, washed and dried after soaking is completed, and first powder is obtained; calcining the first powder in a reducing atmosphere to obtain second powder; and mixing the second powder, high-entropy metal carbide powder or high-entropy metal carbonitride powder and boron carbide powder, and then forming and sintering to obtain the tungsten carbide-based nanocrystalline hard alloy. The comprehensive effect of lanthanide series metal, high-entropy metal carbide powder or high-entropy metal carbonitride powder and boron carbide is utilized, and a novel introduction mode is adopted, so that the granularity of tungsten carbide is effectively inhibited, the nanocrystalline hard alloy with excellent hardness, obdurability and high temperature resistance is successfully prepared, and the practicability is very high.

The utility model discloses a modularization's landscape ecological floating island combination structure, including connecting main body frame, the connecting main body frame bottom middle part is equipped with counterbore, the side of connecting main body frame all symmetry fixedly connected with the plug -in rod, the connecting main body frame bottom fixedly connected with water supply subassembly and aeration subassembly, the side of plug -in rod all through plug -in rod swing joint has the planting frame, the planting frame top middle part all are equipped with mounting hole, the one side of planting frame close to connecting main body frame all are equipped with with the plug -in slot of matching of plug -in rod, the plug -in rod can insert plug -in slot inside, the planting frame top all are equipped with limit slot, the inside of planting frame all swing joint has planting subassembly and purification subassembly, the planting subassembly side bottom fixedly connected with positioning assembly. This structure realizes the modularization combination of assembly, adjusts the main frame according to the applicable scene, improves water quality through the synergies of plant and biological membrane and realizes floating island plant landscape effect.

The invention relates to the technical field of ceramic capacitors, in particular to a lead-free high-voltage pulse-resistant energy storage multilayer ceramic capacitor and a preparation method thereof. The method comprises the steps that ceramic powder, a solvent, a dispersing agent, a plasticizer and a silicon-based defoaming agent are subjected to ball milling to obtain slurry, and the lead-free high-voltage-pulse-resistant energy storage multilayer ceramic capacitor is obtained through the processes of tape casting, screen printing, lamination, lamination, cutting, glue discharging, sintering, chamfering, end sealing, end burning and electroplating in sequence. The thickness of the film is 25-40 [mu] m; 70 Ag-30 Pd, 60 Ag-40 Pd or 90 Ag-10 Pd electrode slurry is used as an inner electrode material, and drying is carried out at the temperature of 65-75 DEG C after printing; the soft pressing temperature is 60-80 DEG C, the soft pressing pressure is 12-15 MPa, and the pressure holding time is 15-18 s; the lamination pressure is 40 MPa to 55 MPa, and the pressure maintaining time is 10 min to 30 min; the glue discharging temperature is 265-325 DEG C, and the temperature is kept for 7-11 hours; the sintering temperature is 1050-1200 DEG C, and the sintering time is 2-4 hours; in the electroplating process, the nickel plating current ranges from 19 A to 21 A, and the time ranges from 90 min to 120 min; the tin plating current is 13A-15A, and the time is 90 minutes to 120 minutes.

The invention discloses a method for preparing an aluminum-based composite material based on melt overheating and rapid cooling forming, and relates to the technical field of aluminum-based composite material preparation. The aluminum-boron alloy and the aluminum-titanium alloy are melted and stirred in a crucible, then the A356 aluminum alloy and the yttrium powder are added for melt overheating treatment and heat preservation for a period of time, meanwhile, a mold is placed in a liquid nitrogen environment to be pre-cooled, then degassing and slagging-off are conducted, and casting liquid is poured into the cooling mold. By adding a high-activity rare earth element Y for melt overheating treatment, the heat energy of the alloy can be remarkably increased, dispersed phase clusters are dissolved, the irregular structure form of a eutectic silicon phase in the alloy is improved, and meanwhile, Al2Y and TiB2 generated in situ can remarkably refine the grain size and improve the mechanical property; and the solid solubility of dispersed phase and eutectic silicon particles in the alloy is improved through a liquid nitrogen rapid cooling technology, grains are further refined, the mechanical property is improved, and the A356 aluminum-based composite material which is easy to produce on a large scale and has excellent performance is obtained.

The invention relates to the technical field of organic fertilizer production, in particular to an organic fertilizer production process and equipment based on three-source fermentation, and the process comprises the following steps: crushing, screening and mixing fermentation raw materials to obtain a fermentation base material; stirring and mixing the fermentation base material, water and the fermentation culture medium additive to obtain a fermentation mixed matrix; stirring the fermentation mixed matrix for fermentation, obtaining the mixed gas production speed of mixed gas generated in the stirring process in the detection period to adjust the fermentation temperature in the fermentation tank, and detecting the microbial concentration to obtain the actual microbial concentration; the fermentation stirring speed is adjusted to meet the fermentation requirement under the condition that the microbial concentration cannot meet the fermentation requirement; whether fermentation is stopped or not is judged by detecting oxygen consumption and fermentation temperature changes, and the fermented mixed substrate is guided into an organic fertilizer separation device to obtain the organic fertilizer. By accurately controlling the particle size of the fermentation base material and adjusting the fermentation temperature, the microbial activity is improved, and the quality of the organic fertilizer is improved.

The invention discloses a composition for preparing dark blue light quasi-two-dimensional perovskite and application thereof. The composition is prepared from the following raw materials: cesium bromide, lead bromide, lead chloride and 2-acrylic acid-2-[[(butylamino)-carbonyl] oxo] ethyl ester. According to the invention, 2-acrylic acid-2-[[(butylamino)-carbonyl] oxo] ethyl ester is introduced as a key additive, and overgrowth of a high n phase (i.e., a higher layer number perovskite phase) in quasi-two-dimensional perovskite is accurately inhibited, so that fine regulation and control of optical properties of a perovskite material are realized, and the perovskite thin film realizes deep blue light emission and has a good application prospect. And the photoluminescence quantum yield (PLQY) of the material reaches 93.4%.

The invention belongs to the technical field of preparation of positive electrode materials, and particularly relates to a high-rate sodium vanadium phosphate positive electrode material, a preparation method thereof and a battery. The method comprises the following steps: S1, dissolving ammonium metavanadate and oxalic acid in water to form a solution A; s2, performing ultrasonic dispersion on CNT in absolute ethyl alcohol to obtain a dispersion B; s3, slowly dropwise adding the dispersion B into the solution A until a stable transparent blue solution C is formed; s4, sequentially introducing sodium dihydrogen phosphate and thioacetamide into the solution C, and stirring to form viscous gel; and S5, carrying out vacuum drying on the viscous gel to obtain a precursor, then carrying out high-temperature heat treatment on the precursor under the protection of a nitrogen atmosphere, and finally putting a product subjected to high-temperature heat treatment in a liquid nitrogen atmosphere for rapid cooling to obtain the high-rate sodium vanadium phosphate positive electrode material. The material has relatively low resistance and relatively large sodium ion diffusion coefficient, so that the reversible specific capacity is highest, and the rate capability is best.

The present invention proposes a method for three-dimensional greening of coastal ecological protection windbreaks using native plants such as thick rattan, which belongs to the technical field of environmental ecological protection. Compared with the prior art, the present invention uses the method of adding a support, without placing soil in the vertical direction, to solve the trade-off problem of water utilization of three-dimensional greening plants, achieves adaptability to salt spray, strong winds, drought, etc., and strengthens the ecological functions of windbreaks such as windbreaks, cooling, salt blocking, and increasing carbon sinks. As a native species, thick rattan not only has beautiful effects and fewer pests, but also can avoid the potential risk of invasion of alien species; the comprehensive use of native species and tree support frame solutions and simple post-management has high feasibility, low construction and maintenance costs, and has obvious advantages in large-scale promotion and use.

The invention discloses a self-supporting FeCo alloy phosphide electrocatalyst as well as a preparation method and application thereof. The preparation method of the electrocatalyst comprises the following steps: S1, pretreating a conductive substrate; s2, preparing a FeCo precursor stacked by an iron-cobalt hydroxide from the conductive substrate, an iron source and a cobalt source through a hydrothermal method; and S3, performing chemical vapor deposition on the catalytic base layer by using a phosphorus source to prepare the self-supporting FeCo alloy phosphide electrocatalyst, wherein the self-supporting FeCo alloy phosphide electrocatalyst is in a nano sheet shape or a pine needle shape. The catalyst has the advantages of low overpotential, good stability, low cost, simple preparation method and the like.

The application discloses a kind of gypsum-based fire-retardant board preparation process heat stability optimization method, comprising the following steps: step one: preparation heat stable type modified gypsum powder, step two: preparation interface compatible type compound flame retardant, step three: preparation homogeneous dispersion type gelling slurry, step four: using gradient compaction layering forming process preparation blank, step five: implementation crystal type control type curing process, step six: after low temperature heat baking later modification treatment;The inorganic-organic composite wet modification that the gypsum matrix is carried out in the application can optimize the growth structure of gypsum crystal, make crystal arrangement more dense, effectively slow down the dehydration rate and crystal form conversion speed of gypsum matrix at high temperature, fundamentally improve the thermal stability of matrix itself.