177 results about "Composite nanofibers" patented technology

The invention discloses a preparation method of a cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel composite pressure sensing material. The preparation method comprises the following steps: (1) preparing a cellulose acetate and thermoplastic polyurethane spinning solution; (2) preparing a cellulose acetate / thermoplastic polyurethane composite nanofiber membrane; (3) preparing cellulose acetate / thermoplastic polyurethane short nano dispersion liquid; (4) preparing a cellulose acetate / thermoplastic polyurethane / polypyrrole polymerization solution; and (5) preparing the cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel. According to the preparation method, a high-temperature thermal annealing process is not needed, and the prepared nanofiber composite aerogel has high conductivity, ultralow volume density, high compression deformation performance and high pressure resistance sensing sensitivity.

The invention discloses a preparation method and application of a composite PVDF-HFP and polylysine nanofiber diaphragm, and belongs to the technical field of lithium batteries. The composite material is prepared by blending polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and polylysine and then carrying out an electrostatic spinning process. The PVDF-HFP is utilized to provide excellent mechanical strength and chemical stability, rich polar amino functional groups in a polylysine molecular chain are utilized to improve the lyophilic property of the membrane, and anions in an electrolyte are fixed through an intermolecular acting force, so that the transference number of lithium ions is increased, and the lithium ions are induced to be uniformly deposited. The nanofiber membrane combines the characteristics of PVDF-HFP and polylysine, has high porosity, good thermal stability and excellent interface compatibility, can effectively inhibit the growth of lithium dendrites and prevent the diaphragm from being punctured, and can significantly prolong the cycle life and improve the safety performance of the lithium metal battery when being applied to the lithium metal battery.

The invention discloses a flexible full-biodegradable Janus nanofiber membrane for oil-water separation, which is characterized in that two degradable polymer spinning solutions are spun into a composite nanofiber membrane with a Janus structure through a side-by-side electrostatic spinning method, and then hydrophilic modification is performed to obtain a hydrophilic nanofiber membrane used as an oil-water separation membrane. The product is the flexible full-biodegradable Janus nanofiber membrane for oil-water separation. The obtained hydrophilic nanofiber membrane has good mechanical flexibility, full biodegradability and excellent oil-water selective permeability, the oil-water separation effect and application stability are remarkably improved, the service life is remarkably prolonged, and the hydrophilic nanofiber membrane will become an oil-water separation membrane material with practical value.

The invention relates to the technical field of lithium-ion solid-state batteries, in particular to a three-dimensional polymer modified intermediate layer for a lithium-ion solid-state battery and a preparation method of the three-dimensional polymer modified intermediate layer, and the preparation method comprises the following steps: adding polyacrylonitrile into N, N-dimethylformamide, and stirring until the polyacrylonitrile is completely dissolved; and then adding the modified polyamide acid-phosphonate copolymer, continuously stirring to obtain an electrostatic spinning precursor solution, and carrying out electrostatic spinning on the electrostatic spinning precursor solution to obtain the composite nanofiber membrane. According to the invention, the indium-containing heterocyclic modified diamine is used as a core monomer of the polyamide acid-phosphonate copolymer, the lithium deposition nucleation overpotential can be reduced by the excellent lithium-loving activity of the indium-containing heterocyclic modified diamine, the lithium is enabled to be compact and free of dendritic crystal deposition, and the indium-containing heterocyclic group is uniformly dispersed in a three-dimensional framework through a cross-linked network of the modified polyamide acid-phosphonate copolymer, so that the performance of the polymer is improved. The contact interface of the intermediate layer and the lithium metal forms a global uniform lithium-loving site, and concentrated deposition of lithium atoms caused by local lithium-loving activity difference is avoided.

The application belongs to the field of medical biological materials, and relates to a preparation method of a hierarchical nanofiber composite film for nerve repair and application thereof. The method comprises the following steps: preparing multilayer nanofibers with different internal stresses through continuous multiple electrostatic spinning units, stacking the multilayer nanofibers with different internal stresses to form a composite nanofiber film with an internal stress gradient; chemically crosslinking the composite nanofiber film; performing adhesion molecule adhesion treatment on the upper surface of the composite nanofiber film; and preparing the hierarchical nanofiber composite film with an internal stress gradient and capable of self-deforming under the action of liquid to wrap nerves. The film provided by the application has excellent flexibility, biocompatibility and degradation performance, can efficiently and quickly adhere to the surface of damaged nerves, provides a good support microenvironment for nerve cell growth, promotes nerve regeneration and repair, and has a wide application prospect in the field of peripheral nerve injury repair.

The present application relates to a kind of Nb2O5 / W 18 O 49 Heterojunction nanofiber photocatalyst and its preparation method and application belong to photocatalytic material technical field. Its preparation method is first prepared Nb2O5 electrostatic spinning precursor solution, and Nb2O5 precursor web felt is obtained by electrostatic spinning technology;Then high-temperature calcination is obtained in air Nb2O5 nanofiber photocatalyst. Again, W 18 O 49 Precursor solution is prepared by hot solvent method, and W 18 O 49 It is successfully prepared Nb2O5 / W 18 O 49 Heterojunction nanofiber photocatalyst. The catalyst shows enhanced CO2 reduction activity and CO selectivity under the irradiation of ultraviolet visible light. The composite nanofiber photocatalyst provided by the application is simple, green and environmentally friendly, has high photocatalytic activity, good stability and repeatability, and has wide application market prospect.

The invention discloses multicolor optical anti-counterfeiting alumite and a production process thereof. The alumite sequentially comprises a magnetic-sensitive enhanced substrate layer, a dynamic separation layer, a temperature-magnetic composite nanofiber multicolor layer, a polyelectrolyte alternate deposition barrier layer and a gradient magnetic-sensitive aluminized layer from bottom to top, wherein the magnetic-sensitive enhanced substrate layer, the dynamic separation layer, the temperature-magnetic composite nanofiber multicolor layer, the polyelectrolyte alternate deposition barrier layer and the gradient magnetic-sensitive aluminized layer are arranged on the alumite; wherein the magnetic-sensitive enhanced substrate layer comprises a graphene modified PET supporting layer and a three-dimensional net-shaped micro-channel embedded with Fe3O4 particles, the dynamic separation layer is temperature-sensitive phase change fluororesin, the temperature-magnetic composite nanofiber colorful layer is electrostatic spinning nanofibers of a core-sheath structure, and the blocking layer is of a polyelectrolyte alternate deposition structure and is embedded with infrared invisible identification particles. According to the invention, four anti-counterfeiting functions of multicolor optical response, magnetic response activation and infrared invisible two-dimensional codes are integrated, the advantages of high multicolor optical contrast, fast response, multiple reuse times, excellent barrier performance, stable transfer printing and the like are achieved, the method is suitable for scenes of high-end tobacco and wine, luxury packaging, high-added-value labels and the like, and the anti-counterfeiting grade and the practicability are obviously improved.

The invention provides a preparation method of a keratin-based temperature-sensitive composite nanofiber membrane. The preparation method comprises the following steps: polymerizing keratin and an N-isopropylacrylamide monomer (NIPAm) to obtain temperature-sensitive keratin; keratin, temperature-sensitive keratin and PEO are blended in proportion to obtain a keratin-based temperature-sensitive spinning solution, then a keratin-based temperature-sensitive composite nanofiber membrane is prepared through an electrostatic spinning technology, finally, the nanofiber membrane is soaked in an EDC-NHS solution for crosslinking, and the water-insoluble composite nanofiber membrane is obtained. The keratin-based temperature-sensitive composite nanofiber membrane not only has good biocompatibility and biological activity, but also has a temperature response function, and shows a wide application prospect in the fields of biomedicine and environment.

The invention discloses a preparation method of porous carbon nanofibers for carbon dioxide capture performance research. The preparation method comprises the following steps: step 1, taking polyacrylonitrile as a base material and polyvinylpyrrolidone as a pore-forming agent, and carrying out electrostatic spinning to obtain composite nanofibers; step 2, soaking the composite nanofibers prepared in the step 1 in sodium hypochlorite to obtain porous nanofibers; 3, performing high-temperature carbonization treatment on the porous nanofibers prepared in the step 2 to prepare porous carbon nanofibers; and step 4, carrying out drying treatment on the porous carbon nanofiber prepared in the step 3. The problems of high technical energy consumption and high cost in the prior art are solved.

A composite nanofiber aerogel (CNA) is formed from aramid nanofibers (ANFs) combined with polyvinyl alcohol (PVA). These nanoscale constituents of the aerogel form 3D networks with high nodal connectivity and strongly welded connectivity joints between fibrils so that the structure has high stiffness and strength compared to other polymeric aerogels and successive breakage of crosslinks at the connectivity nodes affords energy dissipation while maintaining the overall structural integrity. A specific class of CNA with a specific solid content may be used to form a thin firm with a composite nanofiber framework (CNFF) that is useful in the manufacture of kirigami wearable electronics.

The application provides a device for preparing a composite nanofiber porous membrane, and relates to the technical field of nanofiber membranes. The device for preparing a composite nanofiber porous membrane comprises a stirring mechanism, a membrane preparation mechanism, a filtering mechanism and a plurality of quantitative mechanisms, and each mechanism cooperates to complete an integrated operation of material conveying, mixing, membrane preparation and waste gas treatment. The stirring mechanism is a sealed cavity structure, an internal stirring module for stirring and mixing materials is arranged in the stirring mechanism, one side of the stirring mechanism is fixedly connected with the membrane preparation mechanism through a conveying pipeline, the uniformly stirred materials can be stably pumped into the membrane preparation mechanism, and a waste gas pipe is communicated with the stirring mechanism through an air pump close to the upper end position in the stirring mechanism. The device has the advantages of precise quantitative conveying of raw materials, efficient mixing of materials, recycling of waste gas after purification, high automation degree of membrane preparation and discharging, integrated and cooperative operation of each module, and improved production efficiency and product qualification rate.

This invention belongs to the field of nanoenergy technology, and particularly relates to a method for preparing a multifunctional composite nanofiber membrane, a single-electrode triboelectric sensor, and its applications. The method includes the following steps: combining degummed and impurity-removed silk fibroin with a mixed solvent composed of anhydrous calcium chloride and formic acid, and stirring at room temperature to form a silk fibroin solution; adding TiO2 to the silk fibroin solution, and then adding phase change materials (PCMs) after stirring, followed by stirring and ultrasonic treatment to prepare a PCMs / TiO2 / silk fibroin spinning solution; and using solution jet spinning technology to convert the spinning solution into a silk fibroin-based composite nanofiber membrane. This composite nanofiber membrane has an adaptive temperature regulation function of daytime cooling and nighttime heat preservation, especially when applied to model cars, achieving daytime cooling up to 22°C. Simultaneously, the composite membrane also possesses excellent triboelectric properties and can be used to prepare a single-electrode triboelectric sensor with a maximum output power of approximately 272 μW / m. 2 It can realize sensing and monitoring functions in outdoor applications.

This invention relates to the field of gas sensor technology, specifically to a flexible room-temperature ammonia sensor and its fabrication method. It solves the problems of ammonia sensors struggling to balance room-temperature operation with good flexibility, polymer-based sensors having limited sensitivity and poor electron transport, and complex fabrication processes. The sensor comprises a flexible, self-supporting composite nanofiber membrane and interdigitated metal electrodes situated thereon. This invention utilizes organic disulfonic acid as a dopant to introduce sulfonate groups in situ in a one-step process, resulting in sulfonate (-SO3) groups on the surface of the SPANI sensor. ‑ The Zr-TiO2 nanofiber network can interact strongly with ammonia molecules, significantly enhancing its sensitivity to ammonia at room temperature. Meanwhile, the Zr-TiO2 nanofiber network, as a flexible framework and electron transport channel, forms a heterojunction with SPANI, effectively improving the poor electron transport capability of pure polymer materials. The sensor prepared by this invention has the advantages of high sensitivity and good flexibility to ammonia at room temperature.

The invention discloses a preparation method of a Cu-doped SiO2 / C hollow composite nanofiber lithium ion battery negative electrode material. The material is SiO2 / C coated Cu nanofiber. The Cu-doped SiO2 / C composite nanofiber is prepared by utilizing an electrostatic spinning technology and a high-temperature calcination process. The Cu element is doped into SiO2 / C in the form of Cu elementary substance particles, so that the electronic conductivity and the electrode electrochemical performance of the SiO2-based material are successfully improved. Under the current density of 100mA g <-1 >, the residual specific capacity after 100 cycles can reach 515.4 mAh g <-1 >.

The present application relates to a kind of high uniformity transformer insulating paperboard dynamic forming process and integrated preparation system, belong to transformer insulating material processing technical field, the system includes multiple-source modification module, ultrasonic fluidization module, dynamic reconfiguration module and gradient compaction module.Processing steps cover: slurry is carried out electromagnetic polarization and is compounded nanofiber to break flocculation;In the sizing stage, microflow beam treatment is carried out by applying ultrasonic field;In the forming net part, Z-axis interpenetration interweaving is generated by pulse vacuum induction fiber;Finally, temperature gradient formed by multistage temperature control press roller guides moisture migration and completes compaction.The present application introduces electric physical intervention and fluctuation pressure field, realizes the accurate control of fiber from micro-dispersion to three-dimensional reconstruction, effectively solves the problem of insufficient interlaminar bonding force and tightness of insulating paperboard, improves the electrical strength and mechanical robustness of transformer insulating component.

This invention provides a method for preparing a composite nanofiber electron transport layer and a perovskite solar cell, belonging to the field of perovskite solar cell technology. It solves the problem of numerous defects existing on the surface and inside the electron transport layer of current perovskite solar cells. The method includes the following steps: dissolving PAN and SnCl2 2H2O in DMF to obtain a mixture, stirring the mixture in air for a period of time to form a precursor solution; placing the precursor solution into the syringe of an electrospinning apparatus, resulting in hemispherical droplets appearing at the tip of the syringe; using an electrospinning apparatus to obtain a SnCl2 2H2O:PAN composite fiber film with a diameter of nanometers on a prepared conductive substrate; calcining the prepared SnCl2 2H2O:PAN composite fiber film in air at 200°C to obtain pure SnO2:PAN composite nanofibers; and spin-coating a layer of SnO2 thin film onto both the upper and lower interfaces of the prepared SnO2:PAN composite nanofibers. This invention is applicable to perovskite solar cells.

The application relates to the technical field of nanomaterials, and particularly relates to aramid-boehmite composite nanofibers, a synthesis method and application thereof, which comprise the following steps: step one, preparing an Al(OH)3 dispersion solution; step two, preparing an Al(OH)3 precursor; step three, performing solvent exchange; step four, transferring aramid nanofiber gel subjected to solvent exchange into a Teflon container, heating in a closed environment, and obtaining a crude product; and step five, washing the crude product with deionized water and sufficiently drying to obtain aramid-boehmite composite nanofibers. The aramid-boehmite composite nanofibers with aramid nanofibers as cores and boehmite as sheath layers are synthesized by using a hydrothermal method, the aramid-boehmite composite nanofibers are used for coating modification of lithium ion battery separators, the heat resistance and porosity of the lithium ion battery separators are improved, and the Gurley number of the separators is reduced.

This invention discloses a composite nanofiber membrane for immobilizing microorganisms to remediate diesel-contaminated water and its preparation method. Specifically, the composite nanofiber membrane is a thermoplastic polyurethane / nanohydroxyapatite composite nanofiber membrane, which not only possesses excellent biocompatibility and mechanical strength but is also non-toxic and harmless, offering considerable cost-effectiveness. Upon introduction into diesel-contaminated water, the composite nanofiber membrane first rapidly adsorbs diesel at the water / oil interface, preventing further diffusion and toxic effects on the aquatic environment. Subsequently, due to the additional adsorption sites provided by the nanoparticles on the membrane, a large number of free bacteria are adsorbed onto the membrane, enhancing the metabolic activity of bacterial cells and their resistance to the toxicity of stubborn compounds, while also strengthening the affinity between hydrophobic compounds and cells, thereby increasing the degradation rate of diesel hydrocarbons by microbial cells. This invention improves the remediation effect of diesel wastewater while expanding the application of composite nanofiber membranes in the field of water pollution treatment.

The invention discloses a composite nanofiber diaphragm and a preparation method thereof, and relates to the technical field of lithium ion battery materials. Functional groups are introduced into the polyamide acid nanofiber membrane firstly, then silver ions are loaded on the nanofiber membrane, the composite nanofiber membrane is obtained through reduction and thermal imidization, and the prepared composite nanofiber membrane has excellent dendritic crystal inhibition performance and can keep high porosity and excellent ionic conductivity; and the thermal safety is good, so that the battery has excellent electrochemical performance and safety.

The application discloses a kind of β-CD / waste polyester electrostatic spinning composite nanofiber membrane and its preparation method and application, CWP spinning solution and β-CD solution are respectively placed in electrostatic spinning machine receiving drum two ends and are prepared with the " honeycomb structure " β-CD / CWP nanofiber composite membrane, its porosity is high, and β-CD is " bowl shape " structure, these special structures are conducive to reduce filtration resistance, improve the removal of particulate matter PM in oil smoke and volatile organic gas COFs, so as to obtain excellent comprehensive filtration performance.Oil smoke detection system is used to test the real oil smoke purification performance of composite membrane (>90%), which is much higher than that of commercially available oil smoke purification materials;After 120 min cycle purification, the purification efficiency is flat with the initial efficiency (>90%), and can be widely used in high-end air filtration, oil-gas separation and other fields.

The invention provides a shape memory nano short fiber stent with self-adaptive capacity and preparation and application thereof, and belongs to the technical field of tissue engineering materials. The preparation method comprises the following steps: firstly, preparing flexible polylactic acid-fullerol composite nanofibers containing uniformly dispersed fullerol nanocrystals by utilizing an electrospinning technology, then dividing the flexible polylactic acid-fullerol composite nanofibers into short fibers by virtue of homogenization and freeze-drying processes, and assembling the short fibers into a three-dimensional porous scaffold by taking chitosan as an adhesive. The porous scaffold material disclosed by the invention has excellent biological characteristics and a water-triggered shape memory effect, and due to the fact that chitosan has excellent antioxidant activity and inherent bone induction characteristics, the nanofiber scaffold with the controllable and recoverable shape developed by the invention is expected to effectively promote osteoporotic bone healing.

The invention relates to the technical field of aerogel microsphere preparation, in particular to a method for preparing composite nanocellulose aerogel microspheres based on electrostatic field auxiliary regulation and control. Comprising the following steps: forming uniform liquid drops from a silane modified nano cellulose suspension through an electrostatic spraying device provided with an annular electrode group and a real-time monitoring feedback system; the liquid drops are induced by an electrostatic field in a pre-cooling area to be initially set and then subjected to liquid nitrogen cryogenic treatment, gradient freeze drying is conducted, and aerogel microspheres are obtained; and finally, carrying out surface modification on the aerogel microspheres, and loading nano microspheres under the assistance of an alternating electric field to obtain the composite nano cellulose aerogel microspheres. Through the synergistic effect of the multi-stage electric field, accurate regulation and control on the whole process of microsphere forming, internal structure construction and functional compounding are realized, so that the composite nanocellulose aerogel microspheres with narrow particle size distribution, uniform size and adjustable functions are prepared, and the composite nanocellulose aerogel microspheres have wide application prospects in the fields of adsorption, catalysis, biological medicine and the like.

The invention discloses a bio-based waterproof moisture-permeable breathable film and a preparation method thereof, and belongs to the technical field of functional nanofiber film materials. The membrane is a four-layer composite nanofiber membrane and is constructed in situ through a multi-channel electrostatic spinning technology, and interlayer chemical crosslinking is achieved through a Ugi reaction. The preparation method comprises the following steps: preparing a bio-based polymer spinning solution, a dialdehyde-containing polyurethane spinning solution, an isonitrile-containing polyurethane spinning solution and a long-chain fatty acid-containing polyurethane spinning solution; sequentially depositing four layers of nanofibers by adopting a four-row-pipe electrostatic spinning device; initiating a Ugi reaction through heat treatment; and continuously rolling to obtain a finished product. The gram weight of the membrane is 6-30 g / m < 2 >, the air permeability is larger than or equal to 2 mm / s, the moisture permeability is larger than or equal to 12000 g / (m < 2 >. 24 h), and the hydrostatic pressure is larger than or equal to 40 kPa after 10 times of washing. The preparation method is simple in process, high in production efficiency and excellent in performance, and solves the technical problems that a bio-based waterproof membrane is poor in washing resistance and difficult to prepare on a large scale.

The invention relates to the technical field of cigarette perfuming, in particular to functional composite nanofibers and a preparation method and application thereof. The functional composite nanofiber is of a skin-core structure, and a skin layer material comprises cellulose acetate and graphene oxide; and the core layer is made of pyrazine solution. The dyed composite nanofiber prepared by the method disclosed by the invention has excellent mechanical properties, stable core material retention rate and good dyeing fastness, and has wide application prospects in the fields of drug sustained release, cigarette incense lines, decorative materials, special packaging, garment fabrics and the like.

The application belongs to the technical field of catalysts, and relates to a Mott Schottky heterojunction catalytic material and a preparation method and application thereof. The application provides a preparation method of a Mott Schottky heterojunction catalytic material, which uses polyacrylonitrile, Ni(NO3)2.6H2O, WCl6 and an organic solvent as raw materials to obtain a PAN / WCl6 / Ni(NO3)2.6H2O composite nanofiber membrane through electrostatic spinning; and the composite nanofiber membrane is subjected to pre-oxidation and carbonization treatment to prepare the Mott Schottky heterojunction catalytic material. The Mott Schottky heterojunction catalytic material provided by the application has a unique 3D network structure, nickel nanoparticles and tungsten nitride nanowires are uniformly embedded on carbon nanofibers, the formed Mott Schottky heterojunction can significantly promote electron transfer, the carbon matrix ensures structural stability and efficient charge transport, and the Mott Schottky heterojunction catalytic material has excellent HER and SOR bifunctional catalytic activity.

The invention relates to the technical field of lithium ion battery materials, in particular to an electrolyte-carbon fiber coated positive electrode material and a preparation method and application thereof. The preparation method of the material comprises the following steps: mixing and sintering an ultrahigh nickel single crystal precursor, a lithium source and a doping agent to obtain a primary sintered product; obtaining a composite spinning solution containing a high-molecular polymer and a solid electrolyte; the surface of a primary sintered product is coated with composite nanofibers through a fluidized bed assisted electrostatic spinning technology, and then a final product is obtained through pre-oxidation and carbonization treatment. Three-dimensional uniform coating is realized on the surface of a single crystal substrate by adopting a fluidized bed assisted electrostatic spinning process, and a stable electrolyte-carbon fiber composite coating layer is constructed. The coating layer is used as a functional interface layer, and a compatible interface is introduced between the positive electrode and the solid electrolyte, so that the side reaction of the interface is effectively inhibited, the bonding firmness of the interface is enhanced, and the cycling stability of the battery is remarkably improved while high specific capacity is maintained.

The invention provides a composite nanofiber, a preparation method thereof and a wound dressing containing the composite nanofiber, and belongs to the technical field of biomedical materials. The composite nanofiber comprises a polymer nanofiber, a metal organic framework and a blood-derived bioactive substance, the metal organic framework is connected to the polymer nanofiber; the blood-derived bioactive substance is loaded in the metal organic framework. The composite nanofiber is obtained by soaking a polymer nanofiber in a mixed solution of a solution containing a blood-derived bioactive substance and a metal organic framework precursor solution and performing in-situ synthesis. The composite nanofiber provided by the invention has good biocompatibility, biological activity and antibacterial property, has a slow release function, and can be used for wound dressing, promoting wound healing and enhancing a treatment effect.

The application provides an antibacterial crosslinked nanofiber film based on rabbit skin and hair protein and a preparation method thereof, and the preparation method comprises the following steps: rabbit skin gelatin extraction; rabbit hair keratin extraction; rabbit hair keratin solution dialysis purification; rabbit hair keratin powder preparation; nanosilver dispersion liquid preparation; ice acetic acid-nanosilver dispersion liquid preparation; nanospinning liquid preparation; NHS / EDC composite crosslinking agent preparation; and silver-doped gelatin / protein crosslinked composite nanofiber film preparation. The application constructs a three-phase composite nanofiber film material of rabbit hair keratin-rabbit skin gelatin-silver by using a crosslinking reaction. Not only is the bottleneck of poor antibacterial performance of the protein matrix nanofiber film broken, but also the problem of too strong hydrophilicity of the protein matrix nanofiber film is solved, and a neutral quasi-two-dimensional material between hydrophilicity and hydrophobicity is obtained. The air permeability of the material is ensured, and the nanofiber is more easily adapted to the matrix due to the similar fiber structure of the nanofiber and human skin.

This invention relates to a platinum-based high-entropy alloy core-shell catalyst supported on hollow carbon fibers and its preparation method, belonging to the fields of new energy nanomaterials and catalysis technology. The invention aims to solve the problems of low platinum atom utilization, insufficient exposure of active sites, and difficulty in balancing catalytic activity and stability in existing high-entropy alloy catalysts. The main approach involves constructing composite nanofibers from Pt, Cu, Ni, Co, and Zn metal precursors with polyacrylonitrile (PAN) and N,N-dimethylformamide using electrospinning technology. These nanofibers are then coated with a silica layer, followed by high-temperature pyrolysis under an Ar / H2 atmosphere and selective acid etching to enrich Pt on the surface. The resulting high-entropy alloy catalyst undergoes a secondary carbonization treatment to form a platinum shell layer in situ on its surface, thus preparing a platinum-based high-entropy alloy core-shell catalyst supported on hollow carbon fibers.

The invention discloses preparation and application of a copper current collector based on a composite nanofiber layer. The modified copper current collector comprises a copper foil substrate and a vinylidene fluoride copolymer / barium titanate composite nanofiber layer prepared by an electrostatic spinning process. The preparation method comprises the following steps: dissolving a vinylidene fluoride copolymer in an organic solvent, stirring and dissolving, adding barium titanate particles, uniformly dispersing, and directly depositing composite nanofibers on the surface of a copper foil by adopting an electrostatic spinning process; and performing heat treatment to obtain a target product. The vinylidene fluoride copolymer has excellent lithium affinity and electrochemical stability, the dielectric constant of the composite fiber layer can be further improved through introduction of barium titanate particles, and the deposition behavior of lithium ions is effectively regulated and controlled. The composite nanofiber layer can provide uniform nucleation sites for lithium ions, guide uniform deposition of lithium, inhibit growth of lithium dendrites, and significantly improve the cycling stability of the negative-electrode-free lithium battery.