21results about How to "Shorten the diffusion distance" patented technology

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 invention provides a preparation method of a high-compaction high-capacity lithium iron phosphate material, which comprises the following steps: (1) mixing polyvinyl alcohol, iron phosphate, a lithium source, a carbon source and water to obtain slurry A; mixing iron phosphate, a lithium source, a carbon source and water to obtain slurry B; (2) performing spray drying on the slurry A, and performing low-temperature sintering to obtain a black material C; performing spray drying on the slurry B, and performing high-temperature sintering to obtain a black material D; and (3) mixing the black material C and the black material D, crushing, adding barium titanate, carrying out ball milling, and drying to obtain the lithium iron phosphate material. The polyvinyl alcohol is partially acetylated modified polyvinyl alcohol. The sintering temperature is reduced by adding the modified polyvinyl alcohol to prepare the compact lithium iron phosphate material with smaller particle size, and the lithium iron phosphate material and the lithium iron phosphate material obtained by high-temperature sintering form grading of large and small particles, so that the compaction density of the lithium iron phosphate is improved.

This invention discloses a method for preparing hierarchical porous indium oxide nanotubes for lithium-ion battery anodes, comprising the following steps: Step (1) Indium salt and terephthalic acid are placed in an organic solvent and stirred evenly under oil bath conditions to obtain a homogeneous dispersion; Step (2) The homogeneous dispersion is further heated and stirred continuously to carry out the reaction, and after the reaction is completed, it is naturally cooled to room temperature to obtain a mixed reaction system; Step (3) The mixed reaction system is filtered, and the solid product obtained by filtration is washed with anhydrous ethanol and dried to obtain the precursor MIL-68(In); Step (4) The precursor MIL-68(In) is placed in a tube furnace and pyrolyzed in an air atmosphere to obtain hierarchical porous indium oxide nanotubes. This invention can solve the problems of poor cycle performance and rate performance of existing In2O3-based anode materials.

This invention relates to a high-entropy polymetallic organic framework-assisted reinforced magnesium hydride solid-state hydrogen storage material, which is composed of magnesium hydride and a high-entropy polymetallic organic framework in a mass ratio of 30-90:10-70, and its chemical formula is MgH. 2 -(FeCoNiCrMn) 3 O 4 The high-entropy multimetal-organic framework is composed of five different metal cations coordinated in an equimolar ratio; the metal cations are selected from cobalt, nickel, iron, chromium, and manganese. The material of this invention exhibits a high-entropy effect and possesses excellent thermodynamic properties and hydrogen storage cycle performance.

The present application relates to a molecular sieve composition, a preparation method thereof and application thereof. The molecular sieve composition of the present application comprises a mosaic molecular sieve of a TON structure molecular sieve and a 5A type molecular sieve. The molecular sieve composition of the present application has a dual function of adsorption and hydroisomerization.

This invention relates to the field of batteries, and more particularly to a nitrogen-doped carbon / tungsten diselenide nanosphere composite material, its preparation method, and its applications. This invention achieves tight coupling between few-layer WSe2 nanosheets and a nitrogen-doped carbon framework through a process combining complexation-polymerization and subsequent selenization. The resulting material consists of nanosphere particles, providing more electrochemical active sites and shortening the zinc ion diffusion distance. By introducing a nitrogen-doped carbon framework, this invention effectively improves the overall conductivity of the composite material and suppresses the stacking and aggregation of WSe2 nanosheets during charge and discharge, thereby significantly improving rate performance and cycle stability.

The application relates to a method for improving the surface quality of 20CrNiMo forgings, which can effectively improve the surface color difference problem of the 20CrNiMo forgings and improve the product quality. Through high-temperature heating, the composition homogenization is effectively promoted, and the composition segregation phenomenon is reduced. The two roughing + thinning methods and the interchanging of the thickness and width dimensions of the forging are adopted to effectively ensure the compaction effect of the forgings, sufficiently break the coarse organization of the steel ingot, and break the internal dendritic segregation of the steel ingot in the one roughing + thinning deformation + high-temperature homogenization + two roughing + thinning deformation mode for the first time, shorten the diffusion distance between the dendrites, and further promote the organization and composition homogenization, so that the surface color difference quality problem of the forgings is effectively improved. Through the heat treatment after forging, the forging organization is not only refined, but also the internal stress of the forging is removed, so that the mechanical property result reaches the standard requirement.

The application discloses a carbon-based lithium metal composite electrode co-modified by ferroelectric materials and single metal atoms and a preparation method and application thereof. The ferroelectric material is added into a spinning solution to be electrostatically spun into a film, metal ions are adsorbed through ion exchange after activation, and then the carbon-based lithium metal composite electrode is obtained through calcination reduction and finally electrochemical deposition of lithium. The ferroelectric material has a high dielectric constant, can reduce the generation of dendrites by adjusting the lithium ion flux, can promote the uniform distribution of metal atoms on the electrode material to compensate for the poor lithium affinity of the carbon skeleton itself, and can adsorb metal atoms on the surface of the carbon fiber instead of the inside by combining electrostatic spinning and ion exchange method, thereby significantly shortening the diffusion distance of lithium ions, reducing the nucleation overpotential, making the lithium ion diffusion and deposition uniform, effectively improving the lithium deposition uniformity of the carbon-based substrate as the negative electrode of the lithium metal battery, and improving the performance of the electrode.

The invention discloses a carbon cloth three-dimensional structure loaded zinc sulfide cobalt composite material and a preparation method and application thereof, and belongs to the technical field of composite material preparation, the composite material is composed of carbon cloth, zinc sulfide cobalt nanoparticles and spiny structure TiO2; the carbon cloth is a carbon fiber substrate of a composite material, carbon fiber rods of the carbon cloth are interwoven to form the carbon cloth, the zinc sulfide cobalt nanoparticles uniformly cover the carbon fiber rods of the carbon cloth, and the titanium dioxide with the thorn-shaped structure is grown on the zinc sulfide cobalt nanoparticles in a wrapping manner. The prepared composite material has a relatively high specific surface area, and the carbon cloth provides excellent conductivity for the composite material. The binder-free composite material shows long-term cycling stability and excellent rate capability.

The application discloses a high-performance oxygen evolution reaction composite electrocatalyst and a preparation method thereof, and belongs to the field of electrocatalytic material preparation. The application solves the problem that it is difficult to realize uniform loading and precise size control of RuO2 nanoparticles on a three-dimensional porous complex substrate (foamed nickel), thereby affecting the performance and repeatability of the prepared electrocatalyst. The method comprises the following steps: sulfidizing the foamed nickel with thiourea first, and then uniformly depositing RuO2 nanoparticles on the surface of the foamed nickel-based Ni3S2 by using an ALD technology. The application precisely controls the size of the RuO2 nanoparticles on the surface of the foamed nickel-based Ni3S2 to be 1.5-3.5 nm, and the surface density to be 0.8-1.2´10 12 / cm 2 , so that the conductivity and electrochemical activity of the catalyst can be improved, the charge transfer rate can be improved, and the OER performance of the electrocatalyst is improved.

The present application relates to the technical field of tobacco processing, and particularly relates to a tobacco flavor substance extraction device and method. The device comprises an extraction barrel, a grinding assembly, a scraping assembly and a stirring assembly arranged in the extraction barrel. The grinding assembly comprises a grinding disc, a crushing wheel and a driving unit. The grinding disc is fixed in the extraction barrel. The driving unit comprises a motor, a driving gear, a driven gear and a rotating shaft. The motor is installed on the top of the extraction barrel. The scraping assembly comprises a scraper and an elastic force applying structure. The scraper is connected with the rotating shaft through the elastic force applying structure, and the scraper is in contact with the surface of the grinding disc. The stirring assembly comprises a support frame and a stirring member. The support frame is fixed on the lower part of the rotating shaft, and the stirring member is installed on the support frame. The present application solves the problem of low extraction efficiency caused by insufficient crushing and grinding in the prior art, and shortens the extraction time and improves the extraction efficiency per unit time.

The invention provides a ZSM-23 molecular sieve, a preparation method thereof and a catalyst. The preparation method comprises the following steps: mixing a silicon source, an aluminum source, an alkali source, an organic structure-directing agent, a mesoporous template agent, a crystal growth inhibitor and water to form a raw material solution, crystallizing, washing, drying and roasting to obtain the ZSM-23 molecular sieve, the crystal growth inhibitor comprises one or a combination of more than two of trimethoxy [3-(phenylamino) propyl] silane, lauryl sodium sulfate, tetradecyl phosphoric acid and glutamic acid. According to the method, the ZSM-23 molecular sieve with small crystal grains and a hierarchical pore structure can be synthesized in one step, and the catalytic performance of the molecular sieve is improved.

This invention discloses a nano-solid-state hydrogen storage material and its preparation method, belonging to the field of new energy materials technology. The nano-solid-state hydrogen storage material has a core-shell structure, comprising a nano-magnesium-based active phase core and a functionalized porous carbon material outer shell; the core contains in-situ grown multi-metal nanocatalyst particles; the outer shell is doped with non-metallic elements and loaded with metal-organic framework derivative nanoparticles; the core-shell structure is dispersed in a three-dimensional interconnected carbon-based network framework. The preparation method includes: preparing a multi-metal-organic framework precursor solution; synthesizing multi-metal-organic framework nanoparticles using a solvothermal method; chemically combining with a magnesium source and a nickel source to obtain a precursor composite; carbonization treatment to obtain a porous carbon-coated multi-metal nanocatalyst@magnesium-based composite material; constructing a three-dimensional network framework by combining with a functionalized carbon source and metal-organic framework derivatives; and high-pressure hydrogenation treatment. The material of this invention exhibits a low hydrogen desorption temperature, rapid hydrogen absorption and desorption kinetics, and excellent cycle stability.

The application relates to a bionic three-dimensional electrode and a preparation method and application thereof, and belongs to the technical field of batteries. The bionic three-dimensional electrode comprises an electrode main body and a supporting part. The supporting part is connected with the electrode main body and is symmetrically arranged on both sides of the electrode main body. The number of the supporting parts is at least two, and the supporting parts are parallel to each other. The 3D printing centipede structure bionic three-dimensional electrode provided by the application has simple preparation process, and the battery performance can be improved only by improving the three-dimensional electrode structure, which is beneficial to subsequent commercial production.

The invention relates to the technical field of hydrogen storage material preparation, in particular to a method for preparing a Na-Al-H4 hydrogen storage material by using an aluminum alloy strip activated by a multi-metal catalyst. The invention provides a method for preparing a Na-Al-H4 hydrogen storage material by using an aluminum alloy strip activated by a multi-element metal catalyst, which comprises the following steps of: in an inert atmosphere, smelting an aluminum simple substance and the multi-element metal catalyst to obtain a multi-element aluminum alloy cast ingot, and then melting and rapidly quenching the multi-element aluminum alloy cast ingot to obtain a multi-element aluminum alloy strip; the multi-metal catalyst at least comprises elemental titanium and elemental cerium; and in a hydrogen-containing reducing atmosphere, the multi-element aluminum alloy strip and sodium hydride are subjected to ball milling and hydrogenation, and the Na-Al-H4 hydrogen storage material is obtained. According to the invention, titanium and cerium are used as multi-element metal catalysts, and the sodium aluminum hydrogen tetra-hydrogen storage material with excellent hydrogen storage / desorption performance and good cycle stability is obtained by utilizing the synergistic effect between titanium and cerium.

This invention discloses a crystalline polyimide / polyimide composite material, its preparation method, and its applications. The method involves first uniformly mixing phenylhexacarboxylic acid trihydride with a diamine monomer, followed by a solid-phase reaction under argon atmosphere protection. After the reaction, the product is immersed in a polar solvent to obtain crystalline polyimide. Then, the crystalline polyimide is added to an organic solution of polyamic acid, subjected to ultrasonic treatment in an ice-water bath, and subsequently thermosetting to obtain the crystalline polyimide / polyimide composite material. The crystalline polyimide in this composite material has a layered two-dimensional COF structure, giving it relatively high thermal conductivity, heat resistance, and high-temperature mechanical properties. Introducing the crystalline polyimide into the polyamic acid solution utilizes the special interfacial compatibility between the amino groups in the crystalline polyimide and the anhydrides in the polyamic acid to react, solving the problem of difficult processing and effectively expanding its application range.

The invention discloses a gradient co-doped lithium manganese iron phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of batteries. According to the invention, gradient co-doping is realized by injecting a solution B containing a V dopant step by step, rod-like particles are obtained by combining morphology regulation and control, and then the rod-like particles are subjected to multi-layer coating by Li3PO4, MgO and conductive carbon. A structure with a strong shell and a stable inner core is constructed by gradient distribution of V and Mg, ion transmission, interface stability and conductivity are synergistically improved by multi-layer coating, and the positive electrode material is excellent in rate capability, long in cycle life and suitable for the fields of power batteries and energy storage batteries.

The utility model provides a water treatment filter element, include: tubular main part, its lateral wall is equipped with interlayer structure, water treatment medium fills in interlayer structure, center flow channel is formed by the inner wall of tubular main part, water inlet channel sets up on the tubular main part of interlayer structure's outside, water outlet channel communicates with the both ends of center flow channel, wherein, the liquid to be treated is discharged from water outlet channel after tubular main part water inlet channel, water treatment medium in interlayer structure and center flow channel in proper order, through the interlayer structure and center flow channel cooperation of innovation, keep low pressure loss at the same time, make water treatment medium contact time promote, and solve structural fragility problem through the mechanical support of tubular main part.

The application relates to a positive electrode sheet, a preparation method of the positive electrode sheet and a battery. The positive electrode sheet comprises a current collector (100), a first positive electrode active material layer (110) and a second positive electrode active material layer (120), the first positive electrode active material layer (110) is coated on the surface of the current collector (100), and the second positive electrode active material layer (120) is coated on the surface of the first positive electrode active material layer (110) away from the current collector (100); wherein the first positive electrode active material layer (110) comprises a cobalt-containing positive electrode active material; and the second positive electrode active material layer (120) comprises a cobalt-free positive electrode active material. The scheme provided by the application can effectively reduce the side reaction of electrolyte and positive electrode material, improve the structural stability of the positive electrode material of a lithium ion battery, and improve the cycle life and safety performance of the lithium ion battery.

The application discloses a nickel-based alloy sand and a method for optimizing a damaged area surface, relates to the field of nickel-based high-temperature alloy repairing, and the nickel-based alloy sand comprises Cr, Co, Al, Mo, Nb, Hf and Sc, and the rest is Ni or / and inevitable impurity elements; the method for optimizing the damaged area surface mainly adopts the mode of twice sand blasting on the damaged area surface. The application can perform sand blasting treatment on the damaged area surface, achieves the purpose of modifying the damaged area surface, promotes the diffusion of melting point inhibiting elements to the base body, and improves the bonding strength of the connecting interface between the shape and property remodeling area and the base material.

The application belongs to the technical field of concrete, and provides an alkali-activated cementitious material for supercapacitors and a preparation method thereof, the alkali-activated cementitious material is composed of raw materials in the following proportions by weight: fly ash 4-5 parts, slag 1-1.2 parts, alkali-activator 2.5-3 parts; the alkali-activated cementitious material forms zeolite inside after autoclave curing. The alkali-activated cementitious material prepared by the application uses industrial solid waste as raw material, has the advantages of environmental protection and low cost, through optimizing the formula and process of the alkali-activated material, the cycle stability and electrochemical performance of the supercapacitor are significantly improved, the energy storage function of large-volume building materials is realized, and the technical gap of using alkali-activated cementitious material to replace cement-based material to prepare energy storage devices is filled.