457 results about "Layered double hydroxides" patented technology

The invention belongs to the technical field of catalysts, and relates to a surface-reconstructed heterojunction catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving cobalt salt, ferric salt and praseodymium salt in deionized water, heating and spraying on a carrier to prepare praseodymium-doped ferrocobalt layered double hydroxide; mixing the praseodymium-doped ferrocobalt layered double hydroxide with a phosphorus source, and calcining in an inert atmosphere to prepare praseodymium-doped CoP / Fe2P; and carrying out electrooxidation treatment on the praseodymium doped CoP / Fe2P, so as to prepare the Pr6O11 cluster modified CoFeOOH heterojunction catalyst. Through cooperation of three technologies of spray thermal deposition, phosphating and electrooxidation, stable construction and electrochemical activation of a heterogeneous interface are realized, the corrosion resistance and chlorine evolution resistance competitive capacity of the catalyst in a chlorine-containing alkaline system are remarkably improved, the current density of 100 mA. Cm <-2 > can be achieved only through 223 mV overpotential, and meanwhile, stable operation is performed for 500 h.

This invention discloses a method for preparing a CuZnAlGa-based layered double hydroxide (TLH)-derived catalyst for methanol production from carbon dioxide-rich syngas. Using Cu, Zn, Al, and Ga metal salts as precursors, Na₂CO₃ and NaOH as precipitants, and a mixed alcohol-water solution as an auxiliary solvent, co-precipitation is performed under controlled temperature and pH to obtain a LDH-like catalyst precursor. After high-temperature calcination and in-situ reduction in a hydrogen atmosphere, a layered framework structure of Cu nanoparticles immobilized by oxides is obtained. The LDH-like structure provides lattice confinement, preventing Cu particle aggregation, and the interaction between Cu and the oxides enhances the catalyst surface's adsorption capacity for CO and CO₂, thereby improving the activity and stability of methanol production from carbon dioxide-rich syngas.

The present disclosure pertains to methods for enhancing the properties of conventional Li / Al-LDH by integrating polymers to provide compositions comprising a Li / Al-LDH material and a polymer. The present disclosure further pertains to methods of using such polymer-modified-LDH to improve lithium adsorption and extraction performance. The disclosed methods can comprise incorporating the polymer during the precipitation reaction or by mixing the Li / Al-LDH product with a polymer solution under specific conditions. During the lithium extraction process, the disclosed compositions comprising a Li / Al-LDH material and a polymer can be used as an excellent lithium adsorbent to capture lithium ions from low-concentration lithium resources due to its improved physicochemical properties. The disclosed compositions comprising a Li / Al-LDH material and a polymer provides compositions for lithium extraction from low concentration resources, as well as expands the scope of lithium adsorbent material development.

The invention provides a low-temperature-impact-resistant food packaging material and a preparation method and application thereof.The low-temperature-impact-resistant food packaging material is prepared from, by mass, 100 parts of polylactic acid, 1-10 parts of modified layered double hydroxide and 5-40 parts of hyperbranched polyester; wherein the modified layered double hydroxide is obtained by treating layered double hydroxide with a composite anionic surfactant and then treating the treated layered double hydroxide with an organic cationic compound with a long alkyl chain; the composite anionic surfactant comprises a first anionic surfactant and a second anionic surfactant; wherein the first anionic surfactant comprises sodium dodecyl sulfate; the second anionic surfactant comprises a sulfonate anionic surfactant containing an amido bond and a catechol structure. Through the formula design, the impact toughness of the material at low temperature can be improved while the mechanical property of polylactic acid is maintained, and the material can be suitable for the field of food packaging.

The invention relates to the technical field of electro-catalysis and hydrogen energy, in particular to a modified LDH-based catalyst and a preparation method and application thereof. The preparation method comprises the following steps: mixing trimesic acid, water, an organic solvent, a nickel salt, a cobalt salt and an iron salt, carrying out electro-deposition, washing and drying to obtain a NiFeCo-LDH (TA) catalyst; the preparation method comprises the following steps: soaking a NiFeCo-LDH (TA) catalyst in a silver salt solution, washing and drying to obtain the modified LDH-based catalyst. The modified LDH-based catalyst provided by the invention can effectively resist chloride ion corrosion and inhibit dissolution of active metals in layered double hydroxides (LDH) under high current density in seawater, can reach industrial grade current density under relatively low overpotential, and can stably run for more than 1000 hours.

The invention provides a Cu2O-based heterogeneous composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: coating the surface of a Cu2O hollow sphere substrate with a carbon layer, and depositing layered double hydroxides (LDHs) and metal palladium (Pd) nanoparticles on the carbon layer. According to the material, through a Cu2O-carbon layer-LDHs-Pd multistage heterostructure design, space optimization of light absorption, charge transfer and catalytic sites is realized; cu2O-carbon layer-LDHs interface coupling promotes directed migration of photo-induced electron-hole pairs, and the surface plasmon resonance effect of Pd nanoparticles enhances the charge separation efficiency; the LDHs optimizes a charge transfer path through surface oxygen vacancy or metal valence cycle, so that synergistic oxidation of non-free radicals and free radicals is realized, the organic matter degradation efficiency is remarkably improved, the oxidation path is widened, and the performance bottleneck of a single material is broken through.

The invention discloses a compostable and reslurrable mineral-based dual-scale barrier coating as well as preparation and application thereof, and belongs to the technical field of water-based and reslurrable barrier materials. In order to overcome the defects of high coating weight, large color difference or difficulty in recovery in the prior art, a compact barrier is constructed through double-scale collaborative design of interlayer intercalation of layered double hydroxides and interparticle metal micro-networks. The method has the prominent advantage that high-efficiency water-oxygen barrier better than that of a conventional scheme can be realized only by using an extremely low coating amount. Meanwhile, the coating strictly controls color difference to maintain high whiteness of the paper, has pH responsiveness, can be quickly unlapped and dispersed under an acidic condition, and is easy to re-pulp. The coating does not contain PFAS and PVDC, and unification of high barrier, high whiteness and recoverability is achieved.

The invention relates to the technical field of agriculture, in particular to a plant nutrient solution for saline-alkali soil improvement and a preparation method thereof. The invention relates to a preparation method of a plant nutrient solution for improving saline-alkali soil. The preparation method comprises the following steps: preparing NO3-intercalated layered double hydroxides and acid modified calcium-based montmorillonite; preparing humic acid chelated calcium magnesium powder; preparing a binary compound; and preparing the plant nutrient solution. The preparation method comprises the following steps: preparing NO3-intercalated layered double hydroxides from calcium nitrate tetrahydrate and aluminum nitrate nonahydrate, carrying out acid modification on calcium-based montmorillonite by using dilute sulphuric acid, purifying humic acid, and mixing with calcium chloride and magnesium chloride hexahydrate to prepare humic acid chelated calcium magnesium powder. Finally, the three components are added into pig excrement fermentation liquor to prepare a plant nutrient solution, an adsorption-replacement-leaching closed loop can be formed, the desalination and alkali reduction efficiency is remarkably improved, the soil structure is improved, the effect of synergistically improving the saline-alkali soil is achieved, and therefore plant growth is promoted.

The invention discloses a high-barrier polyethylene film and a preparation method thereof, and relates to the technical field of high polymer materials. The invention discloses a high-barrier polyethylene film. The high-density polyethylene composite material is prepared from the following raw materials in parts by weight: 25 to 40 parts of high-density polyethylene, 15 to 30 parts of linear low-density polyethylene, 8 to 16 parts of ethylene-vinyl alcohol copolymer, 3 to 8 parts of nano montmorillonite, 5 to 10 parts of modified layered double hydroxide, 2 to 6 parts of nano silicon dioxide aerogel, 0.2 to 0.6 part of antioxidant 1076, 0.1 to 0.4 part of light stabilizer UV-770, 3 to 7 parts of tributyl citrate and 1 to 3 parts of octadecanamide. 1-3 parts of polyethylene wax, 0.6-1.2 parts of a silane coupling agent KH560 and 7-12 parts of a functional additive. According to the high-barrier polyethylene film disclosed by the invention, by using the modified layered double hydroxide and the functional additive, the barrier property and the antibacterial property are enhanced, the mechanical property is improved, the comprehensive performance is excellent, and the application prospect is good.

The application discloses an electrochemiluminescence immunosensor for detecting interleukin-1 beta and a preparation method and application thereof, and comprises a three-electrode system of a working electrode, a reference electrode and a counter electrode; the working electrode is a modified electrode of CoAl layered double hydroxide, is loaded with platinum nanoparticles after being etched by alkali, and is obtained by fixing interleukin-1 beta antibodies and blocking non-specific sites; and a solution containing luminol is used as an electrolyte during detection of the immunosensor. The working electrode of the immunosensor takes oxygen-rich vacancy CoAl layered double hydroxide as a substrate, combines with platinum nanoparticles to realize EMSI effect, significantly enhances the electrochemiluminescence signal of a luminol-dissolved oxygen system, realizes quantitative detection of IL-1 beta by combining with specific antigen-antibody recognition, and has the characteristics of strong anti-interference ability, fast detection speed and good stability.

The invention discloses a cobalt-iron layered double-metal hydroxide water treatment catalyst, which is characterized in that the cobalt-iron layered double-metal hydroxide is doped with europium element. Compared with existing ferrocobalt layered double hydroxides, after europium is doped, europium can generate a synergistic interaction effect with iron and cobalt, so that the catalytic activity of the material is remarkably improved.

The invention discloses a modified thermoplastic solid-solution anticorrosive coating, a preparation method thereof and application of the modified thermoplastic solid-solution anticorrosive coating on the surface of a pneumatic actuator, and belongs to the field of industrial equipment surface protection materials. Two novel modifiers are designed to construct a multi-protection system. Wherein the layered double hydroxide-silane covalent grafting modifier takes magnesium-aluminum layered double hydroxide as a matrix, and after covalent modification by a silane coupling agent, the matrix is compounded with a quinoline derivative in an intercalation manner, so that the interface bonding and barrier properties are improved; according to the polyaniline-graphene covalent grafting modifier, few layers of graphene and polyaniline are copolymerized and then grafted with a polyurethane prepolymer, so that the toughness and the conductive corrosion resistance of a coating are enhanced. The coating is prepared by taking polyethersulfone as a matrix, compounding the modifier, nano silicon dioxide and other components, mixing, dissolving, dispersing at a high speed and ultrasonically defoaming. The coating has the advantages of high interface adhesion, strong corrosion resistance, dynamic fatigue resistance, environmental protection, no solvent and the like, and is suitable for surface protection of key components such as a pneumatic actuator shell.

The invention relates to the technical field of gel material preparation, in particular to a bio-based gel material for dangerous chemical leakage disposal and a preparation method thereof.The preparation method comprises the steps that gelatin and deionized water are added into a reaction container, a gelatin solution is obtained under the preset dissolution condition, alkaline protease is added into the gelatin solution for an enzymolysis reaction, and a gelatin solution is obtained; a modified gelatin solution is obtained; the preparation method comprises the following steps: adding a phytic acid-chitosan compound and magnesium-aluminum layered double hydroxide into dispersion equipment, and obtaining a composite inorganic matter dispersion liquid under a preset dispersion condition; adding the modified gelatin solution, the composite inorganic substance dispersion liquid, polyethylene glycol and phase change microcapsules into a mixing reactor, and obtaining a premixed solution under a preset mixing condition; sequentially adding an initiator, a cross-linking agent and tetramethylethylenediamine into the premixed liquid, and performing cross-linking reaction under preset cross-linking conditions to obtain a bio-based gel initial product. The plugging efficiency of the bio-based gel material on dangerous chemical leakage is improved.

The invention relates to the technical field of food packaging, in particular to a bacteriostatic aluminum foil material for a meal box and a preparation method thereof. The material is subjected to aluminum foil surface activation, then is sequentially impregnated in a sol impregnation liquid and an outer layer coating liquid, is subjected to dip coating, and finally is subjected to ultraviolet curing to obtain a multi-layer composite structure. The middle layer is made of an aminated organic silicon material and is firmly combined with the aluminum base material and the outer layer resin through chemical bonds, so that the adhesive force of the coating is remarkably improved. The outer coating is added with a phenyl triazole modified layered double hydroxide loaded nano-silver antibacterial agent, so that slow release and efficient broad-spectrum antibacterial property of silver ions are realized, the thermal stability is improved, and reliable performance under a high-temperature condition is ensured. The multilayer design and multiple antibacterial mechanisms have a synergistic effect, the problems of poor antibacterial durability, insufficient adhesive force, low heat resistance and the like of a traditional lunch box aluminum foil material are effectively solved, meanwhile, food safety is considered, and the aluminum foil material is suitable for the field of modern high-requirement food packaging.

The invention discloses a tetrathiomolybdate intercalated ternary iron-magnesium-zinc layered double hydroxide catalyst, a preparation method thereof and an application of the tetrathiomolybdate intercalated ternary iron-magnesium-zinc layered double hydroxide catalyst in degrading azo dyes by activating peroxymonosulfate. According to the method, a carbonate intercalated ternary LDH precursor is synthesized through a hydrothermal reaction, interlayer anions are replaced with nitrate and tetrathiomolybdate through ion exchange, and the target catalyst is obtained. In the catalyst, a unique Fe-Mg-Zn ternary metal laminate and a MoS < 2-> intercalation structure cooperatively construct a multi-active center, and MoS < 2-> is used as an electron donor to promote cyclic regeneration of Fe < 3 + > / Fe < 2 + >. The catalyst keeps ultrahigh activity in a wide range of pH (potential of hydrogen) of 3-9, can completely degrade 10 mg / L of acid orange 7 within 5 minutes, and is stable in structure and low in metal dissolution risk. The problems of low activity, slow Fe < 3 + > reduction, metal ion dissolution and the like under neutral and alkaline conditions in an advanced oxidation technology based on peroxymonosulfate are solved, and the method has important application value in the field of printing and dyeing wastewater treatment.

The invention relates to the technical field of electro-catalytic materials, in particular to a preparation method of a NiFe LDH / NiFeO / NF composite catalyst. The method comprises the following steps: carrying out acetic acid solution pretreatment on a foamed nickel substrate; growing a nickel-iron precursor on the pretreated foamed nickel through the first hydrothermal reaction, and treating to obtain NiFeO / NF; and growing a nickel-iron layered double hydroxide nanosheet on the surface of the NiFeO / NF through a second hydrothermal reaction to obtain the NiFe LDH / NiFeO / NF composite catalyst. According to the preparation method of the NiFe LDH / NiFeO / NF composite catalyst provided by the invention, a NiFeO / NF matrix is prepared by a hydrothermal synthesis method, after air heat treatment, a NiFe layered double hydroxide nanosheet with a smaller size is synthesized on the surface of NiFeO / NF by adopting a secondary hydrothermal process, and finally the NiFe LDH / NiFeO / NF composite catalyst is obtained.

The invention discloses a Mo in-situ doped transition metal layered double hydroxide derivative catalyst. The Mo in-situ doped transition metal layered double hydroxide derivative catalyst is of a nanometer two-dimensional layered structure; nitrate, aluminum nitrate and molybdate are used as raw materials, and a series of nano flaky Mo-X / Al2O3 composite metal oxide catalysts with high activity, high selectivity and high stability are obtained through co-hydrothermal precipitation and one-step roasting reduction. The invention further discloses a preparation method and application of the Mo in-situ doped transition metal layered double hydroxide derivative catalyst. According to the invention, macromolecules in biomass or biomass waste can be effectively depolymerized and liquefied into high-calorific-value bio-oil, so that the effect of turning waste into wealth from oriented conversion of the waste into bio-fuel is realized, and meanwhile, the bidirectional positive effects of avoiding environmental pollution caused by direct emission of the biomass waste and realizing comprehensive utilization of resources are realized; and a path with more economic benefits is provided for conversion from biomass wastes to renewable energy sources.

The invention discloses a polyphosphazene covalent triazine (at) LDH composite flame retardant and a preparation method and application thereof, the composite flame retardant comprises polyphosphazene covalent triazine polymer microspheres and Co-Cu layered double hydroxides coating the surfaces of the polyphosphazene covalent triazine polymer microspheres, the Co-Cu layered double hydroxides are grown on the polyphosphazene covalent triazine polymer microspheres in situ through a one-step hydrothermal method, and the Co-Cu layered double hydroxides / polyphosphazene covalent triazine polymer microspheres are prepared. The composite flame retardant is simple and efficient in synthesis method, high in thermal stability and stable in physical and chemical properties; more importantly, under the synergistic effect of the material and the structure, the composite flame retardant is doped into an epoxy resin material in a physical blending manner, so that the heat release rate, the total heat release amount and the smoke release amount of the material during combustion can be effectively reduced, the heat release rate, the total heat release amount and the smoke release amount reach the V-0 level in a UL94 test, reburning can be effectively prevented, and the service life of the material is prolonged. The tensile property and the impact property of the epoxy resin composite material are further improved.

The invention provides a chlorine corrosion resistant cathode for electrolyzing seawater as well as a preparation method and application of the chlorine corrosion resistant cathode. The preparation method comprises the following steps: S1, dissolving a cobalt salt, a nickel salt, a morphology regulating agent and a structure-directing agent in a solvent according to a molar ratio of (1-2.5): (1-2.5): (8-12): (6-10), and stirring to form a first solution; s2, a titanium mesh and the first solution are subjected to a hydrothermal reaction at the temperature of 100-150 DEG C, and CoNi layered double hydroxide with the shape of a nanoneedle array grows on the titanium mesh in situ; s3, selenium powder and a reducing agent are dissolved in a solvent according to the molar ratio of 1: (0.8-1.5) and stirred to form a second solution; and S4, carrying out hydrothermal reaction on the titanium mesh on which the CoNi layered double hydroxides grow in situ and a second solution at 150-190 DEG C so as to grow cobalt-nickel bimetallic selenide of which the morphology is a nanoneedle array in situ on the titanium mesh, thereby obtaining the chlorine corrosion resistant cathode.

The invention provides a method for enhancing the flame retardant property of a bio-based composite material, and belongs to the technical field of bio-based composites.The method comprises the steps that wood fibers are pretreated through a sodium hydroxide solution to increase hydroxyl active sites, and a silane coupling agent KH550 is adopted for surface modification to form covalent bond connection; the preparation method comprises the following steps: preparing a nano aluminum oxide and layered double hydroxide compounded nano flame-retardant synergistic system, adding a reaction type phosphorus-nitrogen flame retardant DOPO-HQ in a polyethylene melt blending process to carry out an in-situ polymerization reaction, determining optimal reaction condition parameters by using a greywolf hunting optimization algorithm, and preparing the flame-retardant composite material through compression molding and post-heat treatment processes. A flame retardant-fiber-matrix three-dimensional chemical bonding network is constructed, molecular-level compatibility improvement and uniform dispersion are achieved, and the technical problem that the compatibility of an organic phosphorus flame retardant and wood fibers is poor is solved.

The invention discloses high-strength plastic particles as well as a preparation method and application thereof, and belongs to the technical field of high polymer material modification. The plastic particle is prepared from high-density polyethylene, hyperbranched polyesteramine containing a diurea group, a layered double metal hydroxide-polypyrrole nano hybrid, a maleic anhydride grafted ethylene-octylene copolymer, an antioxidant and calcium stearate. Wherein the hyperbranched polyesteramine containing the diurea group is prepared by reacting pentaerythritol with citric acid to generate a citrate framework and then reacting with diphenylmethane diisocyanate and 1, 4-butanediol; the layered double hydroxide-polypyrrole nano hybrid is prepared by carrying out in-situ polymerization and coating on magnesium-aluminum layered double hydroxides through a pyrrole monomer. According to the plastic particle, the tensile strength, the heat resistance and the flame retardance are remarkably improved through synergistic enhancement of the hyperbranched polyesteramine and the nano hybrid, and the plastic particle can be applied to the fields of automobile bumpers, high-voltage cable sheaths, weather-proof plates for buildings and the like.

The invention discloses a foamed nickel-based composite material based on an electro-deposition / hydrothermal synthesis method, which is characterized in that firstly, foamed nickel NF is used as a substrate, cobalt hydroxide is loaded on the surface of the NF through electro-deposition, and Co (OH) 2 / NF with a lamellar stacked flower-shaped structure is obtained; the preparation method comprises the following steps: preparing NiCo-LDH (layered double hydroxide) Co (OH) 2 / NF, then converting the NiCo-LDH (layered double hydroxide) Co (OH) 2 / NF into ZIF-67 through an impregnation method to obtain ZIF-67 (at) Co (OH) 2 / NF with a regular dodecahedron structure, and finally, preparing NiCo-LDH (at) Co (OH) 2 / NF with a honeycomb stacked structure through a hydrothermal method. The preparation method comprises the following steps: 1, preparing foamed nickel electro-deposition cobalt hydroxide; 2, preparing the foamed nickel loaded ZIF67 and cobalt hydroxide; and 3, preparing the nickel foam loaded nickel-cobalt layered double-metal hydroxide and cobalt hydroxide. When the material is used as a supercapacitor material, the area specific capacitance is 17-18F cm <-2 > when the current density is 1mA cm <-2 >; and when the current density is 10mAcm <-2 >, 70-80% of the initial capacity is still kept after 5000 charge-discharge cycles are carried out.

The application discloses a kind of flame-retardant TPU composite material and preparation method thereof, belong to the field of plastic processing.It is with melamine, phenyl boronic acid as raw material preparation melamine phenyl borate, and with magnesium-aluminum layered double hydroxide compounding, using melt blending, extrusion molding method prepares a kind of flame-retardant TPU composite material.The obtained flame-retardant TPU composite material has excellent mechanical properties, thermal stability and flame-retardant performance, it can realize surface rapidly carbonization when burning test, with strong smoke suppression effect, and can realize rapid off-fire self-extinguishing.

The invention relates to the technical field of metal surface protective coatings, in particular to a corrosion-resistant coating for a building aluminum template and a preparation method of the corrosion-resistant coating. The problems that a coating is prone to failure under the stress-corrosion synergistic effect, and the protection service life is short are solved. The coating comprises an organic silicon hybrid bottom layer, a dual-carrier corrosion inhibitor energy storage layer, a microcapsule self-repairing layer and a wear-resistant super-hydrophobic top layer. An oxidized ceramic layer is generated on the surface through micro-arc oxidation, and then a bottom layer is formed through dip-coating of organic silicon hybrid sol and curing; dispersing the porous silicon dioxide microspheres loaded with the corrosion inhibitor and layered double hydroxides in water-based resin to prepare an energy storage coating, and forming a corrosion inhibition energy storage layer; urea resin microcapsules and gelatin-Arabic gum microcapsules are added into a resin matrix to prepare a self-repairing coating, and a self-repairing layer is formed; and finally, mixing the fluorosilane-modified nano aluminum oxide and nano silicon dioxide with wear-resistant organic silicon resin to form a super-hydrophobic top layer.

The invention belongs to the technical field of civil engineering materials, and particularly relates to sprayed concrete suitable for a chlorine salt erosion environment and a preparation method of the sprayed concrete. And meanwhile, the bionic helical carbon nanotube-polymer composite gel is pre-dispersed in water. Sequentially adding the aggregate, the fiber and the composite cementing material, carrying out dry mixing, adding the gel dispersion liquid, the water reducing agent and the air entraining agent, and stirring to obtain a mixture; and finally, adding an alkali-free liquid accelerator at a nozzle through a wet spraying process, and spraying the alkali-free liquid accelerator to a construction surface. The nano hybrid material can effectively adsorb and lock chloride ions, and the bionic gel has a crack self-repairing function. And the two components have a synergistic effect, and are combined with a compact microstructure and a fiber reinforcing and toughening effect, so that the obtained concrete has extremely high chloride ion penetration resistance and durability, and is particularly suitable for support and protection engineering in chlorine salt environments such as temporary expressways and the like.

The invention discloses an electrochemical luminescence immunosensor for detecting interleukin-1 beta as well as a preparation method and application of the electrochemical luminescence immunosensor. The electrochemical luminescence immunosensor comprises a three-electrode system consisting of a working electrode, a reference electrode and a counter electrode, the working electrode is a modified electrode of CoAl layered double hydroxides, the modified electrode is subjected to alkali etching and then loaded with platinum nanoparticles, then an interleukin-1 beta antibody is fixed, and non-specific sites are closed, so that the working electrode is obtained; when the immunosensor is used for detection, a solution containing luminol is used as an electrolyte. The working electrode of the immunosensor takes oxygen vacancy-rich CoAl layered double hydroxide as a substrate, platinum nanoparticles are combined to realize an EMSI effect, an electrochemical luminescence signal of a luminol-dissolved oxygen system is remarkably enhanced, and antigen-antibody specific recognition is combined to realize quantitative detection of IL-1beta. The method has the characteristics of strong anti-interference capability, high detection speed and good stability.

The invention discloses a ferrocobalt-based self-supporting oxygen evolution electrode and a preparation method and application thereof, and belongs to the technical field of electrodes. The electrode is obtained by growing a layer of needle-like ferrocobalt layered double hydroxide catalyst on the surface of foamed nickel through a simple solution immersion-etching method and through preparation of a precursor solution. The preparation method comprises the following steps: mixing an isopropanol solution of cobalt nitrate with a ferrous sulfate aqueous solution, and putting a nickel-based substrate into the solution for immersion etching, so as to obtain the cobalt-iron layered double hydroxide catalyst electrode. The preparation method disclosed by the invention is mature and simple in process route, mild in condition, easy to control and easy to amplify, and the oxygen evolution (OER) catalytic activity of the nickel-based catalyst is also remarkably improved.

The invention discloses a preparation method and application of a high-entropy layered double hydroxide oxygen evolution catalyst, and relates to the field of oxygen evolution reaction catalysis, and the preparation method comprises the following steps: S1, washing foamed nickel in absolute ethyl alcohol and deionized water, and then carrying out ultrasonic treatment in a hydrochloric acid solution to obtain pretreated foamed nickel; s2, adding ferric salt, cobalt salt, nickel salt, manganese salt, zinc salt and a proper amount of urea into deionized water, then adding ammonium fluoride, and uniformly stirring to obtain a mixed solution; and S3, transferring the mixed solution and the pretreated foamed nickel into a reaction kettle, carrying out a hydrothermal reaction, and washing and drying the obtained product to obtain the high-entropy layered double hydroxide oxygen evolution catalyst. According to the method, the key regulation and control effect of NH4F on the structure, chemical and electro-catalytic properties of HELDHs in the synthesis process of the HELDHs is analyzed, and the performance enhancement is attributed to NH4F-induced morphology and crystal engineering and catalytic active cation vacancies generated in situ through selective leaching of Zn < 2 + > and adsorption of sulfate under the alkaline condition.

The application discloses a wear-resistant copper alloy material and a preparation method thereof, and belongs to the technical field of alloy manufacturing. The wear-resistant copper alloy material comprises a copper-aluminum alloy and a surface coating. The copper-aluminum alloy comprises the following components: electrolytic copper powder, aluminum material, iron powder, manganese powder and graphene / Ni-Fe layered double hydroxide composite. The aluminum material comprises pure aluminum and coconut shell fiber / waste aluminum composite, and the mass ratio of the pure aluminum to the coconut shell fiber / waste aluminum composite is 1:(5-6). The surface coating comprises the following components: lignin-modified MXene / metal organic framework / g-C3N4 composite material, epoxy-modified isocyanate oligomer and silane coupling agent-modified nano-silicon sol. The application solves the problem of internal and external defects caused by waste aluminum in the preparation process of the copper-aluminum alloy.

The invention relates to the technical field of metallocene polyolefin materials, and particularly discloses a modified polyolefin film material as well as a preparation method and application thereof. The film material is prepared from the following components in parts by weight: 50 to 70 parts of metallocene linear low-density polyethylene, 20 to 35 parts of ethylene-butyl acrylate copolymer, 15 to 25 parts of polyolefin elastomer, 5 to 15 parts of bio-based degradable polyester elastomer, 3 to 8 parts of reactive compatilizer, 5 to 15 parts of organic modified layered double hydroxide, 8 to 20 parts of composite flame retardant, 0.3 to 1.5 parts of antioxidant and 0.5 to 1.5 parts of lubricant. The preparation method comprises the steps of melt blending, casting extrusion, two-way stretching and the like. The thin film has low hardness, high elongation, low melting point and moderate mechanical strength, the performance of the thin film can accurately meet specific application requirements, and the thin film is particularly suitable for the field of composite fabric of clothes, bags, shoes, hats and the like with high requirements for touch feeling and elasticity.