529 results about "Porous composite" patented technology

The invention belongs to the field of biomedical materials, and particularly discloses a preparation method and application of a 3D printing porous composite scaffold. I-type collagen and silk fibroin composite gel is modified on a 3D printing three-element doped hydroxyapatite / polycaprolactone (PCL) composite scaffold with a polydopamine coating, the three-element doped hydroxyapatite is synthesized by using a chemical precipitation method, and Mg < 2 + >, Sr < 2 + > and SeO3 < 2-> ions are doped in crystal lattices. The 3D printing porous composite scaffold provided by the invention effectively simulates the structure and function of soft and hard combination of natural bones, is helpful for regulating and controlling the stem cell fate to improve the bone regeneration process, repairs bone defects while eliminating tumors, and can be applied to bone defect repair or osteosarcoma treatment.

The invention provides a preparation method of an acid-resistant and chlorine-corrosion-resistant porous composite electrode and a device constructed on the basis of the electrode and used for preparing hydrogen and chlorine by electrolyzing a sodium chloride solution, two cavities are provided, an acid or neutral saturated sodium chloride solution is filled in the cavities, the cavities are separated by a proton exchange membrane or a diaphragm, and the proton exchange membrane or the diaphragm is filled in the cavities. And in the electrolysis process, the cathode generates high-purity hydrogen, the anode generates high-purity chlorine, the chlorine is absorbed by sodium hydroxide in the gas collection bottle and generates sodium hypochlorite, or the chlorine is introduced into a sodium bromide / sodium iodide solution to replace bromine / iodine elementary substances, and the chlorine is discharged from the gas collection bottle. The sodium hypochlorite solution and the bromine / iodine water are used for disinfection and sterilization experiments. The corrosion-resistant porous composite electrode for electrolysis of an acidic or neutral saturated sodium chloride solution is prepared, the electrolysis voltage of the corrosion-resistant porous composite electrode is further reduced by loading a cathode / anode catalyst, and an acidic or neutral saturated sodium chloride solution electrolysis device constructed based on the electrode can be used for preparing high-purity hydrogen and chlorine.

The invention discloses a process for preparing a polyester fiber fabric by regenerating polyester waste bottle flakes, belongs to the technical field of polyester fiber fabric processing, and aims to solve the technical problem that the moisture absorption and quick drying performance, friction resistance and pilling resistance of the polyester fiber fabric in the prior art need to be further improved. The method comprises the following steps: adding polyester waste bottle flakes into a pulverizer, pulverizing, sieving with a 60-mesh sieve to obtain polyester regenerated powder, and pretreating the polyester regenerated powder to obtain pretreated polyester powder; composite polyester is prepared from modified polysiloxane enhanced copolyester containing nylon 6 and polyvinyl alcohol blocks, and then the porous composite polyester fiber is prepared by taking polyvinyl alcohol as a pore forming agent, so that the moisture absorption and quick drying performance of the polyester fiber fabric is effectively improved, the wearing experience of the polyester fiber fabric is enhanced, and the service life of the polyester fiber fabric is prolonged. The wear-resistant and anti-pilling performance of the polyester fiber fabric is also improved.

The invention relates to a fly ash-based MOFs adsorption-catalysis material integrated preparation method, and belongs to the field of solid waste treatment and resource utilization. The material takes industrial solid waste fly ash as a matrix, and is prepared by the following steps: firstly, carrying out alkali modification and silane coupling agent surface activation treatment on fly ash to form a high-activity matrix; then loading a metal organic framework (MOFs) on the surface of the activated fly ash through an in-situ synthesis process to form a porous composite carrier; the integrated material with CO2 adsorption and catalytic conversion functions is further prepared through impregnation of a copper-based active component and a high-temperature calcination process. According to the invention, the problems of high energy consumption, high cost and low comprehensive utilization rate of fly ash of the traditional CO2 capture and utilization technology (ICCU) are solved, high-valued resource utilization of industrial solid waste and efficient capture and conversion of CO2 are synchronously realized, and the method has dual values of environmental protection and economy.

The invention relates to the technical field of batteries, in particular to a porous composite diaphragm, a preparation method thereof and a secondary battery. The porous composite diaphragm comprises a base membrane, a first coating and a second coating, the first coating and the second coating are oppositely arranged on the two surfaces of the base film; the first coating layer and the second coating layer comprise a copolymer containing a first monomer unit and a second monomer unit; the first monomer unit contains a cyano group on a side chain, and the second monomer unit contains a carbonyl group on a side chain; in the copolymer, the molar ratio of the second monomer unit is 1-20%; the first coating and the second coating comprise skeleton structures and first-class pore structures formed between the skeleton structures, and second-class pore structures are formed on bodies of the skeleton structures; and the average pore diameter of the first-type pore structure is greater than that of the second-type pore structure. According to the porous composite diaphragm, the lithium ion conductivity can be improved while the bonding performance with a pole piece is improved.

The invention provides an aerogel-based porous composite material for sewage treatment and a preparation method and application thereof.The preparation method comprises the steps that a nanocellulose solution and a cobalt source solution are mixed to obtain a precursor solution, and under the stirring and heating conditions, an organic ligand solution is dropwise added into the precursor solution to obtain a reaction solution; uniformly mixing the reaction solution with polyvinyl alcohol, injecting the mixture into a mold, and performing directional freezing to obtain an aerogel matrix; and carrying out hydrophobic modification on the aerogel matrix. Through the synergistic effect of the nanocellulose skeleton and the ZIF-67 crystal, and in combination with a hierarchical porous structure constructed by directional freezing, efficient synergism of physical adsorption and chemical catalysis is realized, so that the material shows an excellent removal effect on dyes, hydrocarbon pollutants and heavy metal ions in complex water bodies such as printing and dyeing wastewater and petrochemical wastewater in a wide pH range (pH = 3-11).

The invention discloses a potassium ferrate composite environmental remediation material as well as a preparation method and application thereof. The material comprises the following components in percentage by weight: 40-70% of potassium ferrate; 20-50% of a porous carrier; and 5-10% of a stabilizer. The preparation method comprises the following steps: S1, potassium ferrate synthesis: synthesizing potassium ferrate under the action of an auxiliary catalyst by adopting a sodium hypochlorite oxidation method; s2, modifying a porous carrier: activating the porous carrier with acid, soaking the porous carrier in a stabilizer solution, and drying for later use; and S3, composite loading: mixing the potassium ferrate powder and the porous carrier in proportion, then adding a binder, carrying out ball milling, then carrying out tabletting molding, and then carrying out calcination in an inert atmosphere to obtain porous composite particles, namely the environmental remediation material. The composite structure delays decomposition of potassium ferrate, and the validity period of the material is prolonged to 6 months or above. The porous carrier provides adsorption sites and cooperates with the oxidation-adsorption effect to improve the pollutant removal rate. The calcining process enhances the mechanical strength of the material, and is suitable for flowing water or deep soil injection.

The invention discloses a silicon-tin-carbon composite material as well as a preparation method and application thereof, and the silicon-tin-carbon composite material sequentially comprises a porous silicon core, a first coating layer and a second coating layer from inside to outside, the first coating layer comprises a porous carbon material and tin located in pores of the porous carbon material, and the second coating layer comprises an amorphous carbon coating layer; pores of the porous silicon core contain tin and a porous carbon material. Tin of the silicon-tin-carbon composite material is located in pores of the porous carbon layer, so that the problem of tin expansion and the problem of tin agglomeration in the subsequent high-temperature carbonization process are buffered; meanwhile, a porous composite layer formed by tin and a porous carbon material is compounded to the surface and pores of the porous silicon core, so that the surface defects of porous silicon are repaired, and the expansion of silicon is limited to a certain extent; and on one hand, the outermost coated carbon layer can inhibit the volume expansion of silicon and tin in the charging and discharging process and increase the conductivity of the composite material.

The invention provides a microbial slow-release porous composite material for sewage treatment as well as a preparation method and application thereof. The preparation method comprises the following steps: dropwise adding an organic ligand solution into a precursor solution consisting of a nanocellulose solution and a cobalt source solution; mixing the reaction solution with polyvinyl alcohol, injecting the mixture into a mold, and performing directional freezing to obtain an aerogel matrix; carrying out hydrophobic modification on the aerogel matrix to obtain a modified aerogel matrix; mixing the microbial suspension with sodium alginate, and homogenizing at high pressure to obtain a gel precursor emulsion; the preparation method comprises the following steps: dropwise adding a calcium chloride solution to gelatinize to obtain gel particles, and then cross-linking and drying by glutaraldehyde to obtain sustained-release capsule particles; dispersing the sustained-release capsule particles in deionized water to obtain dispersion liquid; and dipping the modified aerogel matrix in the dispersion liquid. An aerogel matrix with a hierarchical porous structure is compounded with a sustained-release capsule with a pH response mechanism, so that physical adsorption, chemical catalysis and biodegradation for sewage treatment are realized.

The invention provides a photocatalytic porous composite material for sewage treatment and a preparation method and application thereof, and the preparation method comprises the following steps: dropwise adding an organic ligand solution into a precursor solution composed of a nano cellulose solution and a cobalt source solution, mixing a reaction solution with polyvinyl alcohol, injecting the mixture into a mold, and carrying out directional freezing to obtain an aerogel matrix; carrying out hydrophobic modification on the aerogel matrix to obtain a modified aerogel matrix; the preparation method comprises the following steps: dissolving tetrabutyl titanate and cetyltrimethylammonium bromide in absolute ethyl alcohol, stirring and heating to obtain precursor sol, adding a ferric nitrate solution into the precursor sol for hydrothermal reaction, and filtering and calcining after the reaction is finished to obtain doped titanium dioxide particles; and dispersing the doped titanium dioxide particles in deionized water to obtain a dispersion liquid, and dipping the modified aerogel matrix. According to the invention, a composite material composed of a nanocellulose / ZIF-67 composite aerogel matrix and doped titanium dioxide particles is constructed, and efficient sewage treatment of adsorption-catalysis-regeneration cycle is realized.

The embodiment of the invention provides a nano-porous composite membrane and a preparation method thereof, and a lithium ion battery, the nano-porous composite membrane comprises a base membrane and a metal organic framework material layer, the metal organic framework material layer is attached to at least one side surface of the base membrane, the metal organic framework material layer comprises a metal organic framework material, and the metal organic framework material layer comprises a metal organic framework material. The nano-porous composite diaphragm can resist the high temperature of 250 DEG C. The surface of the polyolefin diaphragm is simply coated with a layer of organic metal framework material, strong oxidation impurities in the battery and harmful strong reducing gas generated by side reaction can be effectively adsorbed, fire and explosion are not detected when the temperature of the diaphragm battery reaches up to 250 DEG C, thermal runaway of the battery can be completely inhibited, and the service life of the battery is prolonged. The safety problem of the battery is solved, and the application field of the battery is widened. In addition, the battery also shows good cycle performance at room temperature.

The present invention relates to a porous composite feedstock for metal chloride preparation, comprising a metal oxide containing material,; and / or a first additive; and a binder; wherein the porous composite feedstock is in particulate form; wherein the water content of the porous composite feedstock is in the range of from 0.01 to 5 wt.% based on the weight of the porous composite feedstock; and wherein the porous composite feedstock has a poured bulk density in the range of from 0.2 g / cm3 and 2.0 g / cm3.

The invention relates to the technical field of nano-generators, in particular to a triboelectric material of nano-porous composite fibers and a preparation method and application of the triboelectric material of the nano-porous composite fibers, and the preparation method comprises the following steps: adding polyvinylidene fluoride and perfluoroethylene propylene copolymer nanoparticles into a mixed solvent of N, N-dimethylacetamide / acetone; uniformly mixing to obtain a polyvinylidene fluoride / perfluoroethylene propylene copolymer nanoparticle spinning emulsion; and carrying out electrostatic spinning on the polyvinylidene fluoride / perfluoroethylene propylene copolymer nanoparticle spinning emulsion to obtain the triboelectric material. The triboelectric material prepared through the method is a high-charge-density super-hydrophobic nano-generator material based on electrostatic spinning, the electrostatic spinning porous composite fiber material is used as a friction medium layer, high surface charge, hydrophobicity and fouling resistance are achieved, and the performance of a flexible solid-liquid interface nano-generator is improved.

The invention provides a silicon carbide-diamond porous composite material as well as a preparation method and application thereof. The silicon carbide-diamond porous composite material comprises diamond particles coated with silicon carbide layers, and the adjacent diamond particles coated with the silicon carbide layers are connected through silicon carbide or silicon carbide and silicon to form a three-dimensional continuous silicon carbide-diamond network and an interpenetrating porous pore network; the silicon carbide-diamond composite porous material comprises the following components in volume fraction: 50%-90% of diamond particles, 10%-50% of silicon carbide and 0%-20% of silicon. The material has high thermal conductivity (the highest thermal conductivity is 800W / m.K) and high strength (the bending strength reaches 200MPa), and is suitable for the fields of heat dissipation of electronic devices, high-end equipment and the like.

The invention belongs to the technical field of repairing refrigeration spraying materials, and particularly discloses a daytime passive radiation refrigeration polyurea composite spraying material with a structure repairing function and a preparation method of the daytime passive radiation refrigeration polyurea composite spraying material. And preparing the spraying material with certain flowability. The porous composite polyurea repairing radiation refrigeration spraying material is synthesized by utilizing the multi-graded micron hollow glass beads, has a multi-stage pore structure, and can optimize the pore size grading, so that the spraying material has high daytime radiation refrigeration power and excellent structure repairing capability at the same time.

The invention discloses a high-sensitivity proximity sense and three-dimensional pressure sense flexible capacitive sensor. The capacitive sensor comprises a plurality of sensing units which are distributed in an array mode, and each sensing unit comprises a contact layer, a hierarchical porous composite sensitive conductive unit and an induction electrode unit which are sequentially arranged in a stacked mode. Dual-mode measurement of proximity sense and three-dimensional pressure sense is achieved through a single-sensing-body mechanism, when a measured object is not contacted, the sensing unit completely works in a dielectric state, proximity sense measurement can be achieved, after the measured object is contacted, the sensing unit works in a common electrode state, three-dimensional pressure sense measurement can be achieved, and the sensing unit can be used for measuring the proximity sense and the three-dimensional pressure sense. Compared with a traditional flexible dielectric material, the hierarchical porous composite material is used as the sensitive unit, so that the dielectric constant and the deformation capability of the sensitive unit are greatly improved, and high sensitivity of flexible proximity sense and three-dimensional pressure sense measurement is ensured.

The present invention relates to the field of intelligent meat preservation equipment, and provides a movable assembled meat non-crystallization frozen intelligent preservation rack. It includes a main frame and a control system. The main frame is provided with a storage space with adjustable layer spacing and stackable turnover boxes. The back panel of the rack frame is integrated with a touch-type power interface, a multi-point temperature sensor and a control system; a porous composite electrode plate is arranged opposite the side panels on both sides of the rack to generate a controllable electric field; the control system is arranged on the back panel of the rack, and by inputting meat raw material information and ambient temperature, the control system decides and outputs non-crystallization frozen storage and abnormal ice early warning ablation electric field parameters, and the electrode plate space forms a multi-mode feedback matching electric field to inhibit ice nucleus formation. The non-crystallization frozen intelligent preservation rack provided by the invention can be flexibly connected in parallel, and is suitable for different preservation needs of multiple raw materials and multiple scenes, breaking the boundaries of traditional freezing and refrigeration temperature zones, and realizing intelligent preservation of frozen quality and cold storage.

The invention provides a porous composite solid electrolyte membrane as well as a preparation method and application thereof, and belongs to the technical field of solid electrolyte materials. According to the porous composite solid-state electrolyte membrane provided by the invention, the three-dimensional porous fiber membrane constructed by the modified nanofibers is used as a framework of the porous composite solid-state electrolyte membrane, so that the interface bonding capacity of the modified nanofibers, the inorganic solid-state electrolyte powder and the membrane-forming polymer can be improved; further, the porous composite solid electrolyte membrane has excellent mechanical properties such as flexibility; the inorganic solid electrolyte powder is uniformly dispersed in the three-dimensional porous fiber membrane, the porous network structure can provide more lithium ion transmission channels, the ion migration rate is improved, and the conductivity of the porous composite solid electrolyte membrane is improved; the porous composite solid-state electrolyte membrane provided by the invention comprises the flame-retardant plasticizer, and the membrane-forming polymer and the flame-retardant plasticizer are compounded to improve interface contact, so that the mechanical property of the porous composite solid-state electrolyte membrane is improved.

The invention relates to a cell comprising: - An anode comprising a lithium metal layer, - An electrolyte comprising at least one lithium salt and at least one solvent, - A cathode comprising a porous composite layer which comprises at least one active material.

The invention relates to the technical field of sound absorption composite materials, in particular to a porous composite material capable of enhancing sound absorption performance and a preparation method and application of the porous composite material capable of enhancing the sound absorption performance. And high-efficiency sound absorption can be realized in the full frequency band of 100Hz-6000Hz. Especially in the low-frequency band of 200Hz-1000Hz, the sound absorption coefficient is increased by 20%-50% compared with that of a traditional porous material with similar thickness and weight, and the problem that the traditional material is insufficient in low-frequency sound absorption is solved.

The invention discloses a three-dimensional porous graphene / ferric oxide electromagnetic shielding composite film and a preparation method thereof, and belongs to the technical field of functional composite materials. In order to reduce or eliminate electromagnetic radiation, the three-dimensional porous rGO / Fe3O4 composite material is prepared by taking nano Fe3O4 and GO as raw materials and adopting a graphene oxide reduction self-assembly nanoparticle capturing method. The porous 3D rGO / Fe3O4 composite electromagnetic shielding material is obtained by mixing a dispersing agent and Fe3O4, adding the mixture into a graphene oxide dispersion liquid and capturing nano Fe3O4 through a graphene oxide reduction self-assembly process. Drying the 3D rGO / Fe3O4, and then mixing the 3D rGO / Fe3O4 with waterborne polyurethane to prepare an rGO / Fe3O4 / waterborne polyurethane composite coating; and coating the slurry on a base material to prepare the rGO / Fe3O4 electromagnetic shielding film. The preparation process is simple and easy to control, and raw materials are low in cost, easy to obtain and environmentally friendly; the graphene-based composite electromagnetic shielding material which is light in weight, high in strength, good in stability, good in flexibility and high in electromagnetic shielding efficiency can be prepared at present.

The invention discloses a method and a system for predicting the tensile strength of a low-temperature wet saturated porous composite material laminated plate, and belongs to the technical field of civil aviation composite material design and evaluation, the method for predicting the tensile strength of the low-temperature wet saturated porous composite material laminated plate comprises the following steps: S1, estimating the tensile strength of the porous composite material laminated plate based on a stress field intensity method; s2, introducing a Tsai equation to fit a function relationship between the mechanical property parameters and the temperature and humidity environment parameters of the porous composite material; and S3, importing different temperature and humidity environment parameters into the function relationship to obtain the tensile strength of the porous composite material laminated plate in different temperature and humidity environments. On the basis of engineering estimation of the tensile strength of the porous composite material laminated plate based on a stress field intensity method, a Tsai equation is introduced to fit a function relationship between mechanical property parameters of a composite material and a temperature and humidity environment; and an engineering estimation technical scheme capable of predicting the tensile strength of the moisture-absorption saturated porous composite material laminated plate in the low-temperature environment is established.

The invention provides a nano-porous composite electro-catalytic material and a preparation method and application thereof.The composite electro-catalytic material comprises a nano-porous alloy catalytic layer and an electroplating alloy catalytic layer, the nano-porous alloy catalytic layer comprises a metal substrate and a nano-porous structure, the nano-porous structure is formed on the surface of the metal substrate, and the electroplating alloy catalytic layer is formed on the surface of the metal substrate. And the electroplating alloy catalyst layer is formed on the surface of the nano-porous structure through electroplating. According to the invention, the electroplating alloy catalyst layer and the nano-porous structure layer are strongly combined to increase the bonding strength and the structural stability, and the nano-porous structure can accelerate the permeation of electrolyte and the diffusion of H2 bubbles, so that the mass transfer efficiency and the gas diffusion rate in the HER process under high current are ensured; meanwhile, the large specific surface area can provide more active sites for an electro-catalysis hydrogen evolution reaction; the electroplating alloy in the electroplating alloy catalytic layer contains metal elements with high HER catalytic activity, and the kinetic energy barrier of the hydrogen evolution reaction can be further reduced, so that the overpotential of the hydrogen evolution reaction is reduced.

The invention discloses an anti-fatigue aluminum alloy bar. The anti-fatigue aluminum alloy bar is formed by compounding 90-95 wt% of modified aluminum alloy and 5-10 wt% of a porous composite ceramic framework. A modified aluminum alloy is a hypereutectic aluminum-silicon alloy, a used modifier is a P + La + Gd composite modifier, the size and morphology of primary silicon and eutectic silicon can be effectively improved, the effects of melt purification, refining and degassing are achieved, and the organization structure and performance of the aluminum alloy are optimized. The porous composite ceramic skeleton is composed of cubic boron nitride and aluminum nitride, the porosity is 65-75%, the aperture is 200-300 microns, and the porous composite ceramic skeleton has high strength, high hardness and a three-dimensional network structure, is well combined with an aluminum alloy matrix, and has isotropy as an alloy reinforcement. The aluminum alloy bar integrates high plasticity and high toughness of an aluminum alloy and high strength and high hardness of a ceramic material, is excellent in comprehensive mechanical property and has excellent anti-fatigue performance.

The invention discloses a coated defluorination composite material based on a microbial mineralization technology and a preparation method thereof. According to the coated defluorination composite material, urease vaterite calcium carbonate particles are used as a material core part, and the outer surface of the core part is coated with a calcium cross-linked porous composite film to serve as a coating layer of the material; the calcium cross-linked porous composite membrane is a porous membrane material formed by cross-linking calcium ions and a porous matrix, and the porous matrix is selected from any one of chitosan, cellulose, sodium alginate and porous silicon; the urease vaterite calcium carbonate particles are generated in situ after urea hydrolysis is catalyzed by urease and a calcium source is added. The composite material has the advantages of efficient defluorination effect and good stability when used in fluorine-containing wastewater, and the preparation method of the coated defluorination composite material is simple and easy to implement.

The invention provides a catalytic material, a preparation method thereof and application of the catalytic material in high-purity ethyl aliphatic amine, and belongs to the technical field of fine chemical engineering. The catalytic material provided by the invention has a porous structure, so that the specific surface area of the catalytic material can be remarkably increased, more active sites can be used for contact between reaction raw materials and a catalyst, the reaction process is accelerated, meanwhile, the retention time of the reaction raw materials on the surface of the catalyst is prolonged by the porous structure, and the conversion rate of the reaction raw materials (liquid ammonia) is further improved; active components are loaded on the surface of the AB2O4 type porous composite transition metal oxide, so that the number of active sites can be further increased, and the conversion rate of liquid ammonia is further improved. Results of the embodiment show that when the catalytic material provided by the invention is used for preparing ethyl aliphatic amine by an ethanol catalytic amination method, the conversion rate of liquid ammonia is 95% or above.

The invention particularly relates to an MXene and halide solid electrolyte composite modified lithium manganese iron phosphate material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. According to the invention, the surface of lithium manganese iron phosphate is coated with halide solid electrolyte to prepare porous composite particles, and then the porous composite particles are deposited on the surface of a few-layer Ti3C2Tx MXene material through electrostatic interaction under the action of a cationic surfactant, so that the MXene and halide solid electrolyte composite modified lithium manganese iron phosphate material is prepared. The problems of diffusion of lithium ions, generation and deposition of divalent manganese ions and the like of existing lithium manganese iron phosphate are effectively solved, the service life of the battery is prolonged, and the method has a wide application prospect.

The invention provides a porous composite current collector and a preparation method thereof, the porous composite current collector comprises a base film layer and a conductive layer arranged on the surface of the base film layer, the conductive layer comprises a conductive material, the base film layer comprises a high-molecular polymer, the base film layer is provided with a plurality of through holes, and the through holes are communicated with the conductive material. And a blocking part for preventing magnetron sputtering pollution is arranged in the through hole. By effectively optimizing the composition and the preparation process of the porous composite current collector, the sheet resistance of the porous composite current collector is reduced, and the situation that a conductive material is hit onto a sputtering back roller through vertical holes to cause back roller pollution is avoided, so that the porous composite current collector has high conductivity and high compression strength, and the binding force of a conductive layer and a base film layer is improved.

According to one embodiment, provided is a carbon dioxide absorption-release device including a pair of electrodes, an aqueous electrolyte, a first electrolyte flow path, and a second electrolyte flow path. Each of the pair of electrodes include a porous composite, where the porous composite contains an electro-conductive component and a porous material on the electro-conductive component, and the porous material includes a reactive moiety for electrochemical proton transfer. In the first electrolyte flow path, one of the pair of electrodes contacts the aqueous electrolyte. In the second electrolyte flow path, the other of the pair of electrodes contacts the aqueous electrolyte.

The invention provides an efficient composite diaphragm for hydrogen production through alkaline electrolysis of water and a preparation method of the efficient composite diaphragm, and belongs to the technical field of hydrogen production through electrolysis of water. The preparation method comprises the following steps: S110, dissolving a polymer raw material in a solvent, stirring and mixing to form a spinning solution; s120, preparing a polymer non-woven fabric from the spinning solution through a flash evaporation method; s130, the polymer non-woven fabric is sequentially soaked in a strong alkali solution and a metal chlorate or metal nitrate solution, and conductive inorganic particles are formed on the surface and in pore channels of the polymer non-woven fabric after roasting; and S140, repeating the step S120 and the step S130 for multiple times, and cleaning the membrane material to obtain the porous composite membrane. The polymer non-woven fabric prepared by adopting a flash evaporation method is used as a diaphragm framework, the thickness of the diaphragm is greatly reduced while the high mechanical strength of the diaphragm is ensured, and the resistance of the diaphragm is further reduced, and then conductive inorganic particles are grown on the surface of the polymer non-woven fabric and in pore channels by adopting an in-situ chemical deposition method. The preparation process is simple, and industrial amplification is easy.