515 results about "Carbon nanofiber" patented technology

The invention belongs to the technical field of fuel cell non-noble metal catalyst material preparation, and particularly relates to a composite carbon nanofiber catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, combining metal ions with an organic ligand in an organic solvent at room temperature to successfully prepare a zeolite imidazate framework material (ZIFs); the preparation method comprises the following steps: carrying out primary carbonization on a prepared ZIFs material in an inert atmosphere high-temperature furnace to obtain a metal nitrogen carbon material, then uniformly mixing the metal nitrogen carbon material with a spinning solution, carrying out electrostatic spinning to obtain composite nanofibers, and then carrying out secondary carbonization in an inert atmosphere to finally successfully prepare the composite carbon nanofiber catalyst (MN-CNF). The catalyst has excellent electrocatalytic activity, can effectively improve the efficiency of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), and also has excellent catalytic stability.

The invention relates to the technical field of engineering plastics, and discloses a polydicyclopentadiene / carbon nanofiber composite material and a preparation method and application thereof.The method comprises the steps that DCPD, ENB and MNA are mixed to be uniform, CNF is added and subjected to ultrasonic dispersion, a Grubbs second-generation catalyst is added and subjected to ultrasonic dispersion after freezing, finally, mixed liquid is poured into a mold, and the polydicyclopentadiene / carbon nanofiber composite material is obtained. And heating and curing to obtain the high-performance PDCPD / CNF composite material. According to the preparation method, the interaction between PDCPD and CNF can be remarkably improved, so that the mechanical property of the composite material is improved, the used raw material DCPD has low viscosity and high reaction activity, and rapid forming can be realized; meanwhile, the whole production process of the modified PDCPD composite material is green and environment-friendly, the process is simple, complicated chemical modification is not involved, and the feasibility of large-scale industrial production is achieved.

The invention discloses a coating type high-molecular flame-retardant material. The composite material is prepared from the following components: organic silicon modified epoxy resin, a bio-based castor oil derivative, hydroxyapatite, carbon nanofibers, expanded graphite, ammonium polyphosphate, zinc borate, nano silicon dioxide, molybdenum oxide, microencapsulated red phosphorus, magnesium hydroxide, melamine cyanurate, aluminum diethylphosphinate, pentaerythritol, trihydroxymethyl phosphine oxide and a silane coupling agent. The coating is prepared from a titanate coupling agent, stearic acid, polyethylene glycol, 2, 6-butylated hydroxytoluene, triphenyl phosphite, 2, 4-dihydroxybenzophenone, sebacic diester, polytetrafluoroethylene micro powder, a modified polydimethylsiloxane flatting agent, organic montmorillonite, a polyether modified silicon defoaming agent and a solvent. The invention has the beneficial effects of high flame retardant efficiency, environmental friendliness, excellent comprehensive performance and excellent processability.

The invention relates to the technical field of water electrolysis hydrogen production, in particular to a self-supporting hollow carbon membrane electrode and a preparation method and application thereof.The preparation method comprises the following steps that a self-supporting hollow carbon nanofiber membrane with metal M and metal M compound heterojunction is prepared through a coaxial electrostatic spinning technology; the self-supporting electrode with a high specific surface area and a rapid mass transfer channel is formed by regulating and controlling the flow rate of the spinning solution of the outer layer and the inner layer and a high-temperature carbonization process, the metal M is selected from one of iron, cobalt, nickel, manganese and molybdenum, and the metal M compound is one of oxide, hydroxide, carbide, nitride, phosphide and chalcogenide. Compared with the prior art, the self-supporting hollow carbon membrane electrode disclosed by the invention has good mechanical stability, good hydrophilic and hydrophobic properties and excellent HER and OER bifunctional catalytic activity, and can be used for efficiently and completely decomposing water.

The invention discloses a method for enriching light metal ions in a pore channel based on carbon nanofiber / carbon fiber nano confinement, and belongs to the technical field of sample pretreatment, and the method comprises the following steps: S1, preparing a carbon nanofiber / carbon fiber confinement material; and S2, putting the carbon nanofiber / carbon fiber confinement material obtained in S1 into a light metal ion solution, and stirring. According to the method for enriching the light metal ions in the pore channel based on the carbon nanofiber / carbon fiber nano confinement, the carbon nanofiber / carbon fiber is used as a confinement fluid carrier, ultrapure water, methanol or n-hexane is used as an extracting agent, a chelating agent does not need to be introduced, the method is green and environmentally friendly, the mass transfer rate is increased, and the method is suitable for large-scale industrial production. Therefore, high enrichment of light metal ions in water is realized.

The invention provides an optical transparency-optical confinement composite nanofiber membrane as well as a preparation method and application thereof. The optical transparency-optical confinement composite nanofiber membrane comprises a PDMS (Polydimethylsiloxane) / PS (Polystyrene) / TPU (Thermoplastic Polyurethane) nanofiber membrane and a photothermal conversion material layer loaded on the PDMS / PS / TPU nanofiber membrane, the PDMS / PS / TPU nanofiber membrane is prepared by taking PDMS, PS and TPU as raw materials and adopting an electrostatic spinning technology; the photothermal conversion material layer comprises honeycomb porous carbon nanofibers and PDA (Personal Digital Assistant). The optical transparency-optical confinement composite nanofiber membrane and the PDMS / PS / TPU nanofiber membrane have excellent light transmittance and hydrophobicity, the photo-thermal conversion material layer has excellent light absorptivity and high photo-thermal conversion capacity, and the optical transparency-optical confinement composite nanofiber membrane has high membrane flux when being used for photo-thermal membrane distillation desalination. And the photo-thermal film is excellent in distillation performance stability.

The invention discloses a preparation method of a modified electrode based on carbon nanofibers and application of the modified electrode in efficient reduction of nitrate and removal of associated organic matters, and belongs to the crossing field of materials science, chemistry and environmental engineering. The preparation method comprises the following steps that firstly, foamed nickel is pretreated, then, carbon nanofibers are loaded on the pretreated foamed nickel through an impregnation and calcination method, and finally, metal copper is deposited on the surfaces of the carbon nanofibers through an electro-deposition method. The introduction of the carbon nanofibers provides a larger specific surface area for the metal copper, promotes the high dispersion of metal copper nanoparticles, and affects the formation of a copper crystal face, thereby significantly improving the catalytic activity of the electrode. The electrode prepared by the method has excellent electro-catalytic performance, is relatively low in cost, is easy to operate and control, and is easy to realize industrial production. The electrode can simultaneously realize efficient reduction of nitrate and degradation of organic matters in an electro-catalysis system, and has a wide application prospect.

The invention relates to a Fe3C-Ru / NFs catalyst as well as a preparation method and application thereof. Wherein the Fe3C-Ru / NFs catalyst comprises carbon nanofibers NFs, and Fe3C and sub-nanoscale Ru particles which are loaded on the carbon nanofibers NFs, and the average particle size of the Ru particles is less than 3nm. The preparation method of the catalyst comprises the following steps: dissolving PVP (Polyvinyl Pyrrolidone), an iron source and a ruthenium source in a mixed solvent of DMF (Dimethyl Formamide) and ethanol to obtain a precursor solution; and preparing FeRu / PVP nanofibers from the precursor solution through an electrostatic spinning method, and then carrying out pre-oxidation and high-temperature carbonization to obtain the Fe3C-Ru / NFs catalyst. According to the invention, Fe3C and sub-nanoscale Ru particles are highly dispersed on the carbon nanofibers, and the Fe3C particles enable the electronic environment of Ru sites to be changed and to be in an electron-deficient state, so that the generation of a catalytic reaction is facilitated, and the catalyst has extremely high electro-catalysis full-water-splitting performance and stability.

The application belongs to the technical field of batteries, and particularly relates to a silicon-carbon negative electrode material and a preparation method and application thereof. The method comprises the following steps: preparing a porous carbon fiber membrane loaded with a metal catalyst; preparing a dispersion solution of a nano-silicon-based material, and distributing the nano-silicon-based material into the porous carbon fiber membrane to obtain a composite porous carbon fiber membrane; and performing thermal chemical vapor deposition on the composite porous carbon fiber membrane in an inert atmosphere containing a carbon source, growing carbon nanofibers and vertical graphene on the surface of the composite porous carbon fiber membrane, and obtaining a silicon-carbon negative electrode material. Through a synthesis route of thermal chemical vapor deposition (T-CVD), the synthesis process is optimized, and a multi-level three-dimensional network structure of carbon nanofibers and vertical graphene is constructed to enhance the electrical conductivity of the silicon-carbon negative electrode material, accelerate carrier transmission, improve the interface contact performance between the silicon-based material and the carbon material, improve the loading capacity of the nano-silicon-based material, inhibit the volume expansion of the nano-silicon-based material, and improve the structure and cycle stability of the nano-silicon-based material.

The present invention belongs to the technical field of carbon material fibers, and discloses a preparation method of a carbon nanofiber reinforced carbon material fiber fabric. The preparation method is as follows: Fix the weakly twisted carbon material fiber tow on an electrospinning nanofiber yarn machine, form a carbon nanofiber membrane by electrospinning and uniformly wrap it on the weakly twisted carbon material fiber tow, then wind it into a roll, and then weave the wound fibers into a fabric, and sequentially perform hot pressing and carbonization treatments on the fabric to obtain a carbon nanofiber reinforced carbon material fiber fabric; Weak twisting means that the twist is 5 to 13 turns / meter. The present invention first coats the carbon nanofibers on the carbon material fibers to improve the interfacial bonding strength between the nanofibers and the carbon material fibers, and then performs hot pressing and carbonization treatments on the fabric prepared therefrom to further improve the mechanical properties, electrical conductivity and thermal conductivity of the fabric, making it show great application prospects in the fields of high-performance composite materials, intelligent textiles, etc.

This invention relates to a method for synthesizing iron-cobalt alloy-doped carbon nanofibers for electrocatalysis using zinc oxide etching, belonging to the technical field of electrode materials and catalysts. The preparation method includes the following steps: 1) mixing DMF (dimethylformamide), PMDA (pyromellitic dianhydride), and ODA (4,4-diaminodiphenyl ether) in a certain proportion to prepare a PAA (polyamic acid) spinning solution; 2) preparing PAA nanofibers from the PAA spinning solution using an electrostatic melt-blowing device; 3) imidizing the PAA nanofibers using a programmed temperature rise method to obtain PI nanofibers; 4) impregnating the PI nanofibers in a salt solution; 5) carbonizing the impregnated PI nanofibers with a large number of metal ions on their surface in an inert atmosphere using a certain temperature rise program to obtain iron-cobalt alloy-doped carbon nanofibers. The iron-cobalt alloy-doped carbon nanofibers prepared by this method exhibit excellent performance as an ORR / OER bifunctional electrocatalyst and have wide applications.

The invention discloses a carbon nanofiber / porous carbon microsphere-based positive electrode and negative electrode for a zinc ion battery, which are structurally characterized in that a three-dimensional network carbon nanofiber skeleton and honeycomb porous carbon microspheres form a composite conductive carrier; the positive electrode adopts an interconnected conductive network formed by overlapping carbon nanofibers loaded with manganese dioxide nanosheets on the surfaces and honeycomb porous carbon microspheres embedded with manganese dioxide inside; and a metal zinc layer is deposited on the surface of the same carrier for the cathode. The preparation method mainly comprises the following steps: preparation of a carbon nanofiber / honeycomb porous carbon sphere composite membrane, preparation of a manganese dioxide composite positive electrode material by a hydrothermal method, and preparation of a zinc composite negative electrode material by a constant current deposition method. According to the design, the ion transmission efficiency is improved through the three-dimensional hierarchical pore structure, the conductivity is enhanced through the carbon network, the problems of poor structural stability, fast capacity fading and the like of the zinc ion battery electrode material are effectively solved, and the cycle performance and the rate capability of the battery can be remarkably improved.

The invention provides a method for preparing a flexible carbon nanofiber membrane, the flexible carbon nanofiber membrane and a proton exchange membrane fuel cell, and belongs to the technical field of functional nanofiber membrane preparation. The method for preparing the flexible carbon nanofiber membrane comprises the step of carrying out hot pressing treatment on the PAN fiber membrane doped with the carbon nanotubes before carbonization treatment. The prepared flexible carbon nanofiber membrane has excellent mechanical strength and conductivity, and is suitable for the fields of high-performance composite materials, fuel cells and the like.

The invention discloses an anti-leakage high-thermal-conductivity composite phase change material which comprises the following raw materials in parts by mass: 100 parts of a carbon precursor solution, 10-40 parts of a two-dimensional nanofiller, 6-24 parts of surface modified carbon nanofibers and 900-1000 parts of a phase change material. The invention further discloses a preparation method of the leakproof high-thermal-conductivity composite phase change material. The integrated amphiphilic phase change material packaging structure which is formed by the one-dimensional / two-dimensional heterogeneous hybrid filler and the continuous phase carbon source and is subjected to surface treatment can provide an efficient heat transfer path for heat conduction; and good liquid phase change material packaging is formed through the hydrogen-bond interaction of the phase change material and the surface modification coating layer, so that the leakproof performance of the structure is improved.

The present invention discloses a triaxially spun superelastic and high-temperature resistant composite carbon nanofiber aerogel and a preparation method thereof. The aerogel is formed by interweaving curly fibers with a core layer of carbon and a shell layer of oxide ceramic. The present invention utilizes electrostatic spinning technology to prepare composite carbon nanofiber aerogels. First, an inner layer polyacrylonitrile solution is prepared, and the water / alcohol ratio is adjusted to prepare a middle layer ceramic sol with controllable water content, thereby obtaining a spinning solution with compatibility in the initial spinning stage. The temperature and humidity of the airflow of the outer nozzle are then regulated, and the water content of the ceramic sol is further adjusted during the spinning process, so that the spinning solution becomes incompatible. The spinning solution jet is fast and solidified in advance, thereby obtaining a curly interwoven structure nanofiber aerogel precursor. Finally, the final product is obtained by changing the atmosphere and performing rapid and continuous heat treatment. The present invention solves the problems of insufficient mechanical properties and easy oxidation of carbon nanofiber aerogels. The preparation method is simple and easy to implement, and the process is continuous, and can be carried out on existing electrostatic spinning production equipment.

The invention discloses a nanorod-shaped Ni / Ni3S2 / VN electro-catalytic material and a preparation method and application thereof.The preparation method comprises the steps that firstly, a nickel source is loaded on the surface of bacterial cellulose, and a Ni / Ni3S2 / VN electro-catalytic hydrogen evolution material with the nanorod-shaped morphology is prepared through a solid-phase sintering method; the bacterial cellulose is a pure natural biomass element, has no pollution to the environment, is green and environment-friendly, has a large number of carboxyl functional groups on the surface, can effectively complex free nickel ions in a solution as a template agent, and keeps good catalytic stability after being carbonized into carbon nanofibers, and Ni3S2 and VN are compounded, so that the catalytic performance of the carbon nanofibers is improved. According to the preparation method, a nanorod-shaped heterostructure is formed, part of Ni metal is reduced, all the components have a synergistic effect, the excellent electro-catalytic hydrogen evolution performance is shown in an alkaline environment, the preparation process is green, simple and convenient, and reaction conditions are easy to control.

The invention provides a flexible carbon nanofiber membrane as well as a preparation method and application thereof. The flexible carbon nanofiber membrane comprises a carbon nanofiber matrix and a modified material loaded in the carbon nanofiber matrix, the carbon nanofiber matrix comprises polyacrylonitrile, and the modified material comprises at least one of fluorine and zirconium oxide. The fluorine and / or zirconium oxide modified material is introduced, so that the performance is remarkably improved on the basis of a carbon nanofiber matrix, and the key defects of the existing carbon nanofiber membrane are effectively overcome. The invention also provides a preparation method and application of the flexible carbon nanofiber membrane.

The invention provides a high-entropy alloy carbon nano composite fiber membrane, zinc element and one or more metal elements of iron, cobalt, nickel, magnesium, manganese and copper are compounded and concentrated on the surface of carbon nanofiber in a metal oxide form, the diameter of the carbon nanofiber in the composite fiber membrane is 100-600nm, the fiber is of a porous structure, and the specific surface area is 80-450m < 2 > / g; the fiber membrane is prepared by the following steps: adding metal salt and / or a metal oxide precursor into a solvent, stirring and dissolving to obtain a metal salt precursor dispersion liquid, adding polyacrylonitrile, heating and stirring to obtain a composite fiber membrane spinning solution, and carrying out electrostatic spinning, pre-oxidation and carbonization treatment. The prepared composite fiber membrane is high in evaporation rate and high in output current and voltage, and can be applied to the field of water and electricity co-production.

The invention discloses a cellulose-based cationized carbon nanofiber / cyclodextrin composite demulsifier. The cellulose-based cationized carbon nanofiber / cyclodextrin composite demulsifier is obtained by sequentially carrying out cyclodextrin modification and cationized modification on cellulose-based carbon nanofibers. The preparation method comprises the following steps: firstly, taking biomass cellulose as a raw material, and sequentially carrying out chemical grafting modification, high-pressure homogenization treatment and hydrothermal reaction to prepare cellulose-based carbon nanofibers; then promoting the reaction between the cellulose-based carbon nanofibers and the natural cyclic oligosaccharide cyclodextrin under an ultrasonic condition, and improving the wettability and interfacial activity of the cellulose-based carbon nanofibers; finally, cyclodextrin is modified by utilizing a cationization reagent, so that the surface of cyclodextrin carries a large amount of positive charges, the interfacial activity of the carbon nanofibers is further enhanced, softening of an interfacial film is promoted, the stability of oil drops is reduced, and the demulsification efficiency is effectively improved. The composite demulsifier has the advantages of being small in dosage, low in demulsification temperature, high in demulsification efficiency, easy to degrade and the like, and the related preparation method is simple, environmentally friendly and suitable for application and popularization.

The invention provides a preparation method of a graphene carbon nanofiber film for oil-water separation, and relates to the field of oil-water separation membranes, and the preparation method comprises the following steps: mixing polyacrylonitrile powder and an N, N-dimethylformamide solution to obtain an electrostatic spinning solution; spinning through an electrostatic spinning machine to obtain a polyacrylonitrile fiber membrane; coating the polyacrylonitrile fiber film with the prefabricated graphene oxide dispersion liquid to obtain a graphene oxide / polyacrylonitrile composite film; carrying out pre-oxidation, activation and carbonization treatment on the composite film to obtain a graphene carbon nanofiber film; according to the method, the waste isostatic pressing graphite which is low in price and easy to obtain is adopted as the raw material, the ammonia activation means is combined, improvement is carried out on the basis of a Hummers method, graphene oxide is prepared, resource recycling is achieved, the isostatic pressing graphite waste generated in the production process is recycled and processed into a product with a high additional value, and therefore the purposes of reducing the production cost and saving resources are achieved.

The invention discloses a novel method for rapidly enriching heavy metal ions in water by using confined water, and belongs to the technical field of separation and analysis detection, the method comprises the following steps: S1, preparing carbon nanofiber / carbon fiber; s2, loading the carbon nanofiber / carbon fiber obtained in the step S1, and preparing a needle tip device; s3, heavy metal ions in the solution are extracted through the needle point device liquid phase sodium obtained in the S2. According to the novel method for rapidly enriching the heavy metal ions in the water through the confined water, carbon nanofibers / carbon fibers are prepared through a vapor deposition method, the water is confined in a nanometer space, the heavy metal ions in the water are extracted through the confined water, desorption is conducted through the complexing effect of the heavy metal ions and EDTA, and the heavy metal ions are enriched in the water. Green, non-toxic, simple and convenient to operate, rapid and efficient heavy metal ion extraction and enrichment are realized.

The invention relates to the technical field of nanometer materials and heat management, in particular to a preparation method of a carbon nanofiber heating film with a nanometer mortise and tenon joint structure, a two-stage mortise and tenon joint structure is formed through metal catalysis in-situ growth of carbon nanotubes, and a three-dimensional interpenetrating network between fibers is achieved. The method specifically comprises the following steps: preparing a polymer precursor fiber membrane containing transition metal salt by adopting a free surface electrostatic spinning technology, performing pre-oxidation, and performing melamine-assisted high-temperature carbonization to catalyze and grow a pod-shaped carbon nano tube branch on the surface of a carbon nano fiber to form a mortise and tenon type mechanical interlocking and chemical bonding synergistic interface. According to the structure, the contact area between fibers is increased, the heat conductivity coefficient in the thickness direction and the transverse conductivity are improved, and meanwhile, the mechanical strength is high. No insulating adhesive is introduced, the process is compatible with an existing production line, and the method can be widely applied to the fields of high-power electronic heat dissipation, flexible device heat management and energy.

The invention discloses an iron-nickel diatomic fiber catalyst with a precise and adjustable local structure and a preparation method and application thereof.The method is based on an organic small molecule coordination strategy and comprises the steps that ferric nitrate, nickel nitrate and dicyandiamide are dissolved in DMF according to a certain molar ratio, and a solution A is obtained; dispersing ZIF-8 nanoparticles in DMF (Dimethyl Formamide), and adding polyacrylonitrile to obtain a solution B; the solution A and the solution B are mixed to obtain a spinning solution, and a nanofiber membrane is obtained through electrostatic spinning; and carrying out pre-oxidation and high-temperature carbonization treatment on the nanofiber membrane to obtain the carbon nanofiber catalyst loaded with iron-nickel bimetallic atoms (metal diatoms, heterojunctions and alloys in which the metal diatoms and clusters coexist). The problem that the metal active site local structure of a metal diatom catalyst is difficult to accurately regulate and control is solved, and the prepared metal diatom heterojunction shows excellent ORR and OER bifunctional catalytic performance and cycling stability as a zinc-air battery positive electrode catalyst.

The invention discloses an operation and maintenance regulation and control method and system for a carbon nanofiber-liquid amine carbon capture system, and belongs to the field of operation and maintenance regulation and control of carbon capture systems. The operation and maintenance regulation and control method for the carbon nanofiber-liquid amine carbon capture system comprises the following steps: presetting performance indexes; the method comprises the following steps: acquiring operation parameters of a carbon nanofiber-liquid amine carbon capture system, and constructing a fuzzy cognitive network model based on the operation parameters; analyzing the fuzzy cognitive network model by using an intelligent random decision algorithm; the performance of the carbon nanofiber-liquid amine carbon capture system under each working condition is monitored in real time through the cloud platform, and the operation parameters of the carbon nanofiber-liquid amine carbon capture system are optimized; and comparing the performance after the operation parameters are optimized with a preset performance index, if a comparison result accords with the preset performance index, maintaining the current process control, and if the comparison result does not accord with the preset performance index, adjusting the process control. According to the method, the carbon capture efficiency is improved by identifying the key operation variables and constructing the fuzzy cognitive network model.

The invention discloses a solid-state battery negative electrode material and a preparation method and application thereof, and relates to the technical field of solid-state batteries. The preparation method comprises the following steps: uniformly mixing silicon nanowires, silicon nanoparticles, a carbon nanofiber precursor material and a solvent, preparing a negative electrode material precursor by adopting electrostatic spinning, and carrying out pre-oxidation treatment and carbonization treatment to prepare the solid-state battery negative electrode material, wherein the mass ratio of the silicon nanowires to the silicon nanoparticles is 1: (0.1-4). According to the invention, the silicon nanowires and the silicon nanoparticles are cooperated, and the carbon nanofibers are used as a carrier to form a three-dimensional network structure, so that the diffusion path, anisotropic stress distribution and crushing resistance of Li can be shortened, the cycle performance is improved, and the carbon nanofibers not only improve the mechanical stability of Si in the cycle process, but also provide good conductivity for the electrode. The problems of volume change and low conductivity of the silicon negative electrode material in the use process are effectively solved, and the interface stability of the silicon negative electrode material and a solid electrolyte material is enhanced.

The application provides a preparation method of integrated double-channel PCNFs / ZIF8-SA composite aerogel, a product and application thereof, and steps are as follows: step 1, sodium alginate (SA) and ZIF-8 are added into PCNFs suspension, and SA is fully dissolved by stirring until a uniform mixed solution is formed; the PCNFs are PAN / ZIF-8 / lignin / NaCl carbon nanofibers after hydrophilic modification; step 2, the mixed solution is poured into a mold, and directional freezing is carried out in a freeze dryer to obtain a composite aerogel columnar structure with a directional channel structure; step 3, the upper layer of the composite aerogel columnar structure is subjected to hydrophobic modification to form a hydrophobic layer with a certain thickness, and the lower layer is a hydrophilic layer, and the hydrophobic layer and the hydrophilic layer are integrated. The aerogel has a double-channel integrated special structure of fresh water channel and salt extraction channel, can extract accumulated salt from the side channel while realizing efficient solar seawater desalination, avoids the evaporation channel from being blocked, and greatly improves the evaporation efficiency and the stability of the composite aerogel.

The present invention belongs to the technical field of microwave-absorbing materials, and specifically relates to a method for preparing a cobalt / attapulgite / carbon nanocomposite fiber with microwave-absorbing properties. The preparation method comprises the following steps: mixing a magnetic metal salt, a polymer, a solvent, and nano-attapulgite in a specific proportion, reacting under heating conditions and at room temperature to obtain a mixed spinning solution; electrospinning the mixed spinning solution to obtain composite nanofibers; and carbonizing the obtained composite nanofibers to obtain a cobalt / attapulgite / carbon nanocomposite fiber with microwave-absorbing properties. The present invention has the beneficial effect that, due to the adoption of the above-mentioned technical solution, the carbon nanocomposite fiber of the present invention combines excellent properties such as light weight, strong absorption, a wide effective absorption bandwidth, and a low filling ratio. The carbon nanofibers have excellent dielectric properties, electrical conductivity, thermal stability, and low density. Carbon nanofibers are expected to be used to produce ideal microwave-absorbing materials.

The invention belongs to the technical field of flexible sensors, and relates to a decoupling design and a preparation method of a high-sensitivity flexible temperature-pressure dual-function sensor, in particular to a preparation method of a dual-function flexible sensor capable of detecting external temperature stimulation and pressure stimulation at the same time. The temperature sensor in the bifunctional sensor is a carbon nanofiber membrane obtained by an electrostatic spinning method, and has good response to temperature stimulation based on a thermal resistance working mechanism. A pressure sensing part of the bifunctional sensor is a flexible porous pressure sensor with PDMS silicone rubber as a skeleton, and responds to pressure stimulation based on a piezocapacitance working mechanism. The dual-function sensor realizes complete decoupling of a temperature signal and a pressure signal based on different sensing mechanisms. The manufacturing process of the dual-function sensor is simple, efficient, reliable and low in cost; and the manufactured flexible sensor is high in sensitivity and is applied to the fields of wearable equipment, man-machine interaction, electronic skin, bionic robots and the like.

The invention provides a lithium ion battery silicon-based negative electrode material, a preparation method thereof and a battery, and belongs to the technical field of new energy battery electrode materials. The preparation method of the silicon-based negative electrode material of the lithium ion battery comprises the following steps: oxidizing carbon nanofiber acid, and then carrying out silicon loading to obtain a CNF / Si composite material; the preparation method comprises the following steps: adding an aniline monomer into a xanthan gum solution, and then adding an ammonium persulfate solution until a polymerization reaction is performed to form a dark green gel product A; adding graphene quantum dots into the gel product A, then adding a ferric chloride solution, and stirring for reaction to obtain a gel product B; and adding a CNF / Si composite material into the gel product B, heating and stirring, dropwise adding a borax solution for reaction, and annealing to obtain the silicon-based negative electrode material of the lithium ion battery. The lithium ion battery silicon-based negative electrode material and the battery provided by the invention have the advantages of high cycling stability, high specific capacity and wide application range.

The invention discloses a carbon nanofiber and carbonaceous honeycomb framework composite conductive agent material and a preparation method thereof, and belongs to the field of carbon materials. The method comprises the following steps: blending ferric nitrate and nickel nitrate with citric acid according to a molar ratio of 3: 1 to prepare an impregnation precursor solution; dipping an organic colloidal crystal template and drying to obtain a catalyst precursor; in a double-temperature-zone tubular furnace, a carbon source and a catalyst precursor are synchronously heated in a specific atmosphere, and the composite material with a fishbone-shaped structure is obtained through one-step roasting. The material is a composite system of carbon nanofibers and a carbonaceous honeycomb structure, the electronic conductivity reaches 40-140 S / cm, the structure and thermal stability are good, and the rate capability and cycle life of an electrochemical energy storage system such as a lithium ion battery can be remarkably improved and prolonged as a conductive agent. The method is simple in process and mild in condition, and has a good application prospect.