667 results about "Carbon nanofiber" patented technology

The invention discloses slurry, a battery diaphragm, a preparation method of the battery diaphragm and a battery, and belongs to the technical field of batteries. The slurry comprises the following components: ceramic particles, carbon nanofibers, a binder I and a solvent I, the ceramic particles comprise ceramic particles I and ceramic particles II; the particle size of the ceramic particles I is 0.55-1 [mu] m, and the particle size of the ceramic particles II is 0.05-0.45 [mu] m. The battery diaphragm comprises a base membrane and a composite coating, the composite coating is attached to at least one surface of the base film; the composite coating is formed by curing the slurry provided by the invention. The battery diaphragm provided by the invention has good thermal stability and mechanical strength, the passing rate of the lithium ion battery in coping with safety tests such as extrusion, puncture and heavy object impact is greatly improved, and meanwhile, the electrochemical performance of the lithium ion battery is also improved.

The invention discloses a waterproof heat-resistant adhesive and a preparation method thereof, and relates to the technical field of adhesives. Tetramethyltri-3-trifluoropropyl cyclotetrasiloxane is used as a raw material to prepare hydroxyl-terminated organic fluorosilicone oil and modified epoxy resin, fluorine atoms are closely arranged around a main chain of the hydroxyl-terminated organic fluorosilicone oil and modified epoxy resin in an umbrella shape, and the hydroxyl-terminated organic fluorosilicone oil and modified epoxy resin cooperate with organic silicon to improve the waterproof and heat-resistant effects; hydroxyl groups on the oxidized carbon nanofibers are reacted and combined with thiocyanate in vulcanized rubber powder, and hybrid filler is formed; residual active groups on the surface of the oxidized carbon fiber are combined and crosslinked with epoxy resin, so that the heat resistance of the epoxy resin is greatly improved; secondly, phenyl maleic anhydride is used as a cross-linking agent to form a three-dimensional cross-linked structure, and meanwhile, phenyl is introduced into the structure, so that the heat-resistant effect and the waterproof effect of the epoxy resin are further improved, and the adhesive prepared by taking the epoxy resin as the raw material has excellent waterproof and heat-resistant performance. The adhesive prepared by the invention has waterproof and heat-resistant effects.

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 belongs to the technical field of carbon material fibers, and discloses a preparation method of a carbon nanofiber reinforced carbon material fiber fabric, which comprises the following steps: fixing a weakly twisted carbon material fiber tow on an electrostatic spinning nano yarn machine; forming a carbon nanofiber membrane by utilizing electrostatic spinning, uniformly wrapping the carbon nanofiber membrane on a carbon material fiber bundle subjected to weak twisting, then rolling into a shaft, then weaving the rolled fibers into a fabric, and sequentially performing hot pressing and carbonization treatment on the fabric to prepare a carbon nanofiber reinforced carbon material fiber fabric; the weak twisting means that the twisting degree is 5-13 twists per meter. According to the invention, the carbon nanofiber is coated on the carbon material fiber, so that the interface bonding strength between the nanofiber and the carbon material fiber is improved, and then the fabric prepared from the carbon nanofiber is subjected to hot pressing and carbonization treatment, so that the mechanical property, the electrical conductivity and the heat-conducting property of the fabric are further improved; therefore, the composite material has a huge application prospect in the fields of high-performance composite materials, intelligent textiles and the like.

The invention provides a preparation method of an integrated and dual-channel PCNFs / ZIF8-SA composite aerogel and a product and application thereof, and the preparation method comprises the following steps: step 1, adding sodium alginate SA and ZIF-8 into a PCNFs suspension, and stirring until the SA is fully dissolved until a uniform mixed solution is formed; the PCNFs is PAN / ZIF-8 / lignin / NaCl carbon nanofibers after hydrophilic modification, and the pH value of the PAN / ZIF-8 / lignin / NaCl carbon nanofibers is 7-8; step 2, pouring the mixed solution into a mold, and performing directional freezing in a freeze dryer to obtain a composite aerogel columnar structure with a directional channel structure; 3, hydrophobic modification is conducted on the upper layer of the composite aerogel columnar structure, a hydrophobic layer with a certain thickness is formed, the lower layer of the composite aerogel columnar structure is a hydrophilic layer, and the hydrophobic layer and the hydrophilic layer are integrated. The aerogel disclosed by the invention has a dual-channel integrated special structure including a fresh water channel and a salt extraction channel, accumulated salt can be extracted from a side channel while efficient solar seawater desalination is realized, an evaporation channel is prevented from being blocked, and the evaporation efficiency and the stability of the composite aerogel are well improved.

The invention relates to a carbon nanofiber loaded Cu nanoparticle composite material prepared by combining an electrostatic spinning method and a high-temperature in-situ reduction reaction and used as a high-cycle-stability zinc negative electrode coating of an aqueous zinc ion battery. Belongs to the technical field of new energy materials. The prepared composite electrode material is regular in structure and excellent in electrochemical performance. Cu is introduced through a high-temperature in-situ reduction reaction. And after the Cu is loaded with the carbon nanofibers, not only is the slow dynamic process of the bare zinc electrode improved, but also the uniform deposition of Zn < 2 + > on the zinc negative electrode in the embedding / separating process is induced.

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 ceramic tile is prepared from the following components in parts by weight: 20 to 30 parts of waste ceramic chips, 30 to 40 parts of gel particles, 10 to 20 parts of a precursor material, 5 to 8 parts of carbon nanofibers, 6 to 8 parts of magnesium oxide, 10 to 12 parts of a binder, 10 to 15 parts of coal cinder and 18 to 20 parts of kaolin. According to the ceramic tile prepared from the waste materials and the preparation method of the ceramic tile, the prepared ceramic tile has excellent strength and good mechanical performance.

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 provides a modified carbon nanofiber as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving polyacrylonitrile in N, N-dimethylformamide, so as to obtain an electrostatic spinning precursor solution; s2, performing electrostatic spinning treatment on the electrostatic spinning precursor solution to obtain an electrostatic spinning nanofiber material; s3, sequentially carrying out pre-oxidation and graphitization treatment on the electrostatic spinning nanofiber material to obtain unmodified carbon nanofibers; and S4, soaking the unmodified carbon nanofibers in a K2FeO4 solution, and sequentially carrying out first drying, calcination and acidification treatment to obtain the modified carbon nanofibers. The carbon nanofiber has more active sites, high specific surface area and good conductivity and hydrophilicity, can remarkably improve the energy density and cycling stability of a battery when being used for an electrode material, and can provide powerful technical support for the development of the field of new energy.

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 invention discloses a marine environment integrated sensing function net system and a preparation method thereof, a net body is made of antibacterial polyformaldehyde / ultra-high molecular weight polyethylene bi-component composite fibers, and the antibacterial polyformaldehyde / ultra-high molecular weight polyethylene bi-component composite fibers have the characteristics of high strength, corrosion resistance, wear resistance, self-lubrication, biological adhesion resistance, weather resistance and the like, and are suitable for long-term marine deployment. Optical fiber sensing fibers containing single-mode distributed sensing optical fibers, a polytetrafluoroethylene sleeving and packaging layer and a stainless steel alloy wire woven protection layer are integrated in the net, and various sensing fibers such as basalt fiber base, carbon fiber base, carbon nanofiber base and polysulfonamide fiber base are converted into sensing fibers through an integrated sensor, so that a dual-channel multi-parameter sensing system is formed. And various ocean parameters such as temperature, pressure, water quality and biological activity can be monitored, and ocean water quality and biological activity can be accurately mastered. And the stability and reliability of the sensor are ensured through the protection layer. The preparation method ensures the stability of the net body structure and the accuracy of the sensing function. The network not only can stably operate in a marine environment, but also can provide accurate sensing data, and provides powerful support for marine research and monitoring.

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.

The invention discloses an environment-friendly cooling anti-radiation refrigeration coating and a preparation method thereof, and belongs to the technical field of coating preparation. The raw materials are prepared from core materials, auxiliary materials and ingredients. The core material is prepared from a main raw material, hollow glass beads and environment-friendly resin, the auxiliary material is prepared from a nano additive and mineral pigment, and the ingredients are prepared from ferroferric oxide, nano titanium dioxide, diopside and polyvinylidene fluoride. The main raw materials comprise carbon quantum dots, carbon nanofibers, carbon nanospheres and graphene quantum dots; the environment-friendly resin base material is prepared from waterborne polyurethane resin, rosin resin, shellac resin and polytetrafluoroethylene; the nano additive is composed of silicon carbide, carbon black, carbon fibers, magnesium borate and carbon nanotubes. According to the coating, solar energy can be converted into light energy, the sunlight reflectivity of the coating is improved through the unique optical property of the coating, the sunlight reflectivity of the coating can be correspondingly improved along with increase of the sunlight intensity, and therefore the situation that a building absorbs excessive heat is avoided.

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 discloses a high-energy-density self-supporting negative electrode, a negative electrode preparation method and a sodium ion battery, and relates to the technical field of sodium ion batteries, the high-energy-density self-supporting negative electrode comprises a plurality of self-supporting current collectors, and substrates of the self-supporting current collectors are composed of carbon nanofibers and graphene sheets; the carbon nanofibers form a three-dimensional network structure through electrostatic spinning; and the graphene sheets are inserted and embedded in the three-dimensional network structure to form a three-dimensional network structure. The negative electrode preparation method and the sodium ion battery are based on a high-energy-density self-supporting negative electrode. According to the preparation method, a three-dimensional network structure is constructed on the high-energy-density self-supporting negative electrode by using the carbon nanofibers and the graphene sheets, so that the adhesion area of the negative electrode substrate is increased, the purposes of increasing the active point locations of the negative electrode and improving the conductivity of the negative electrode are achieved, and a more stable self-supporting negative electrode preparation method can be obtained on the basis; and the sodium ion battery with more stable performance is obtained.

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 relates to the technical field of nano materials, in particular to carbon nanofiber aerogel and a preparation method thereof.The preparation method of the carbon nanofiber aerogel comprises the steps that bacterial cellulose dispersion liquid containing inorganic ammonium salt and a polymer solution are mixed to obtain mixed dispersion liquid, the mixed dispersion liquid is subjected to freezing treatment, and after freeze drying, the carbon nanofiber aerogel is obtained; the bacterial cellulose aerogel is obtained; and carrying out pyrolysis treatment on the bacterial cellulose aerogel to obtain the carbon nanofiber aerogel. The polymer is introduced in the preparation process, extra carbon can be generated in the carbonization process, connection between carbon nanofibers is tighter, the overall structural strength of the material is enhanced, through a composite carbon network formed after the polymer is carbonized, the carbon content of the aerogel is increased, and through the crosslinking and filling effects, the thermal conductivity of the aerogel is improved. The mechanical property of the aerogel is improved. A high-strength carbon network can better disperse stress, and collapse or excessive deformation of the structure is avoided when the aerogel bears external force, so that the maximum compression strength of the aerogel is remarkably improved.

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 invention provides a preparation method of a carbon-supported nano zero-valent iron catalytic material based on multi-metal catalysis, and relates to the technical field of catalytic materials. The preparation method of the carbon-supported nano zero-valent iron catalytic material based on multi-metal catalysis comprises the following steps: step 1, preparing raw materials; step 2, pretreating a carbon carrier; step 3, preparing a multi-metal precursor solution; step 4, carrying out impregnation reaction; a synergistic catalytic system is formed by introducing various metals, so that the catalytic activity of the catalytic material is remarkably improved. Main catalytic metals such as iron, cobalt and nickel interact with auxiliary metals such as molybdenum and tungsten, so that the performance of the material is enhanced. The composite of the carbon nanofibers and the porous graphite is used as the carbon carrier, the advantages of the carbon nanofibers and the porous graphite are combined, a larger specific surface area and a more stable structure are provided for metal loading, and the stability of the catalytic material 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 relates to the technical field of magnesia carbon brick preparation, and particularly discloses a magnesia carbon brick for an electric furnace and a preparation method thereof.The magnesia carbon brick for the electric furnace is prepared from, by weight, 60-80 parts of fused magnesia, 8-12 parts of modified graphite, 2-4 parts of binding agent and 1-1.5 parts of antioxidant, and the modified graphite is prepared by spraying graphite with boron nitride powder. The modified graphite can enhance the thermal shock resistance and slag permeability resistance of the material, so that the material is more durable in a high-temperature environment. In addition, on the basis of using the modified graphite, the carbon nanofiber modified phenolic resin is also used in a matched manner, and the carbon nanofibers and the boron nitride modified graphite powder are interwoven to form a more compact carbon net structure. Therefore, the overall strength and thermal shock resistance of the material can be further improved.