159 results about "Carbon paper" patented technology

The invention provides a preparation method of a cobalt-based intermetallic carbide material and application of the cobalt-based intermetallic carbide material in a preparation method of an electrocatalytic nitrate reduction electrolytic tank or a zinc-nitrate battery. The preparation method of the cobalt-based intermetallic carbide material comprises the following steps that cobalt chloride hexahydrate, indium chloride tetrahydrate, dicyandiamide and ketjen black are ground and mixed and then put into a tubular furnace for thermal annealing reduction, and the cobalt-based intermetallic carbide material is obtained. According to the method, cobalt-based intermetallic carbide material Co3InC0.75 powder is prepared into slurry, the slurry is dropped on carbon paper to be used for an electro-catalysis reaction, the material strengthens nitrate adsorption and water decomposition and inhibits a hydrogen evolution reaction, and therefore the performance of electro-catalysis of nitrate reduction to produce ammonia is improved.

The application provides a preparation method of high-conductivity carbon fiber paper and belongs to the technical field of fuel cells. The method comprises the following steps: step 1, dissolving a water-soluble polymer in water to prepare a dispersion liquid with a certain concentration; step 2, dispersing short-cut carbon fibers with a certain thickness of metal plating layer in the dispersion liquid to prepare a fiber slurry; step 3, performing wet papermaking on the slurry, and performing pressing and drying to prepare a raw paper; and step 4, performing high-temperature hot pressing treatment on the raw paper under a reducing atmosphere and a certain pressure to prepare a primary carbon paper. The prepared carbon paper has an electrical resistivity less than 3 mΩ·cm, a porosity greater than 80%, and a gas permeability greater than 2200 ml·mm / [cm 2 ·h·mm·Aq]. The application improves the electrical conductivity of the carbon paper and the gas permeability of the carbon paper, and the process is simple, and the performance of the fuel cell can be obviously improved.

The invention relates to the technical field of methods or devices for directly converting chemical energy into electric energy, in particular to an electrode material, an electrode, a lithium ion battery and a preparation method of the electrode material. The invention provides a carbon paper composite electrode material. The carbon paper composite material comprises a laser-induced graphene substrate material and metal elementary substance or metal compound particles uniformly deposited on the surface of the laser-induced graphene substrate material. In the invention, the vertical structure of graphene can relieve the volume effect of sodium, and the uniformly grown metal particles can induce the uniform deposition of sodium and inhibit the growth of dendritic crystals. And finally, high capacity, high magnification and long-term cycling stability performance are realized.

The present application relates to a kind of preparation of complete mosaic-like barium strontium titanate solid solution ceramic sheet, which comprises the following steps: (1) two initial powders are mixed uniformly. After the stoichiometric ratio of nano barium titanate powder and nano strontium titanate powder is mechanically mixed by planetary ball mill for 24h, it is dried and ground to obtain the powder to be sintered;(2) the powder to be sintered is placed in graphite mold twice, the two powders are separated by two carbon paper, and pre-pressed in hand rotating tablet press and discharge plasma sintering furnace;(3) discharge plasma sintering is carried out, and appropriate sintering parameters are set, and sintering program is started, and after sintering, it is first rapidly cooled to a safe temperature 900 DEG C where grain growth is not easy, and then slowly cooled to 600 DEG C at 5 DEG C / min;(4) the sintered sample is placed in muffle furnace, and annealed at 800 DEG C for 10h, to obtain two relatively complete mosaic-like barium strontium titanate solid solution sheets.

The invention discloses a high-density single-phase alpha-U2N3 block material and a preparation method thereof. The preparation method comprises the following steps: step 1, loading a certain amount of alpha-U2N3 powder into a high-pressure sintering mold embedded with carbon paper, and pre-pressing to obtain an alpha-U2N3 pre-pressed blank; 2, the high-pressure sintering mold containing the alpha-U2N3 pre-pressed blank in the step 1 is put into sintering equipment, nitrogen is introduced, sintering pressure is applied, and after the pressure is stable, the temperature is increased to the sintering temperature and kept for a certain time; and 3, after heat preservation is finished, after the furnace body is naturally cooled to the room temperature, the high-pressure sintering mold is taken out, and a compact alpha-U2N3 block material is obtained. According to the method, alpha-U2N3 powder is used as a raw material, a high-pressure mold designed by combining materials such as graphite and silicon carbide is adopted for sintering in a discharge plasma sintering furnace or a hot-pressing sintering furnace, the sintering temperature is reduced, meanwhile, decomposition of alpha-U2N3 is inhibited, and the alpha-U2N3 block with the density close to the theoretical density is obtained.

The invention belongs to the technical field of gas sensors, and particularly relates to an integrated fuel cell membrane electrode as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: slurry preparation: preparing catalyst slurry and carbon paper slurry; (2) after all the slurries are prepared, catalyst slurry is sprayed, and the catalyst slurry is sequentially sprayed on the two proton exchange surfaces in the spraying process; (3) then spraying carbon paper pulp; in the spraying process, carbon paper pulp is sprayed on the surface of the carbon paper MPL layer; and (4) finally, carrying out hot press molding to obtain the integrated fuel cell membrane electrode. The integrated fuel cell membrane electrode prepared by the invention ensures that the strength and moisture retention of a proton exchange membrane are improved, the impedance of the membrane electrode is reduced, and the measurement precision and the service life of a sensor are effectively improved.

The application provides a fuel cell sealing structure and a preparation method thereof, which comprises a carbon plate, a gasket, carbon paper, a CCM and a limiting element, a plurality of limiting holes are formed in the gasket, and the limiting element is arranged in any limiting hole; the carbon paper is arranged at the middle part of the gasket, the upper and lower sides of the CCM are both provided with the carbon paper and the gasket, any gasket is provided with the carbon plate away from the CCM, and any limiting element extends into the carbon plate. The method for sealing by using the soft rubber gasket has weak adhesion with the surface of the CCM, is beneficial to the flattening and positioning of the CCM, can not be limited by the thickness of the gasket, can control the compression amount of the carbon paper at will, and significantly improves the sealing property of the battery; by using the limiting element, the compression amount of the carbon paper can be limited during the fastening process, and the battery performance is ensured.

The invention discloses an electrolytic hydrogen production electrochemical synthesis ammonia electrode catalyst and a preparation method thereof, relates to the technical field of electrochemical catalysts, and belongs to the patent classification number C25B1 / 00. Comprising the following steps: preparing graphene quantum dot powder by using a fused salt cutting method; then coating the graphene quantum dots through dopamine auto-polymerization and loading a molybdenum source, and annealing to obtain Mo-NX-coated GQDs powder; then compounding the modified Mo-NX-coated GQDs and TiCTXMXene colloid, performing vacuum filtration, depositing on carbon paper, and annealing to form a support film; and finally, performing CFplasma treatment to form a hydrophobic layer, and spin-coating perfluorinated sulfonic acid resin on the side of the carbon paper to obtain the electrode catalyst. According to the method, an efficient active center is constructed, electron / ion transmission is optimized, a three-phase interface is regulated and controlled, the ammonia yield and the Faraday efficiency are remarkably improved, and the method is suitable for a normal-temperature and normal-pressure electrochemical ammonia synthesis technology.

The application relates to the technical field of fuel cells, and specifically provides a carbon paper hot-pressing curing production line, which comprises a roller pressing unit, a plurality of roller pressing mechanisms arranged in sequence along a front-rear direction, a top pressing roller and a bottom pressing roller, a pressing roller gap for carbon paper passing between the top pressing roller and the bottom pressing roller, and an adjustable distance between the top pressing roller and the bottom pressing roller; a flat pressing unit, which is located at the rear end of the roller pressing unit, comprises a top pressing belt and a bottom pressing belt, and has a pressing space for carbon paper passing between the lower horizontal section of the top pressing belt and the upper horizontal section of the bottom pressing belt; and the front-rear direction is the movement direction of the carbon paper. The carbon paper hot-pressing curing production line of the application combines the characteristics of the roller pressing process and the flat pressing process, realizes the comprehensive improvement of the thinness, flatness and curing strength of the carbon paper in the pressing process, and solves the problem that the carbon paper cannot be produced by high-quality pressing at present.

The application provides a carbon paper electrode material, a preparation method thereof and a vanadium redox flow battery. The preparation method comprises the following steps: dispersing carbon fibers and carbon nanomaterials in a dispersion liquid to form a mixed suspension; preparing a carbon paper base paper through a wet papermaking process; immersing the carbon paper base paper in a solution of a thermosetting resin, and performing drying treatment and hot-pressing curing treatment after the immersion is completed to prepare a carbon paper electrode material precursor; and performing carbonization treatment on the carbon paper electrode material precursor at 1000-1800 DEG C to obtain the carbon paper electrode material. The process method uniformly disperses the carbon nanomaterials in the skeleton of the carbon fibers, and the dispersion is more uniform. The obtained carbon paper electrode does not need to be pretreated before use, and the process flow is simplified. Meanwhile, the uniform doping of the carbon nanomaterials increases the specific surface area and the reaction activity of the electrode, and improves the energy efficiency of the flow battery.

The invention discloses a preparation method and application of a nickel-molybdenum polyacid-polymer-based self-supporting electrocatalyst with low platinum-carbon loading capacity, and relates to the technical field of electrocatalysts. The preparation method of the electrocatalyst comprises the following steps: weighing raw materials for preparing an electrolyte solution; comprising nickel sulfate, ammonium molybdate, chloroplatinic acid, borax, polyvinyl alcohol and chitosan. Uniformly mixing the raw materials with deionized water to obtain a nickel molybdenum polyacid solution, a borax solution and a PVA-CS solution, obtaining a target electrolyte solution, and soaking the target electrolyte solution with carbon paper; freezing and drying; performing carbonization; the treated carbon paper is used as a working electrode, a saturated calomel electrode is used as a reference electrode, and a graphite electrode is used as an auxiliary electrode; and platinum is electrodeposited on the carbon paper by adopting a cyclic voltammetry electrodeposition method to prepare the electrocatalyst. According to the prepared electrocatalyst, the cost can be reduced, the reaction kinetics of an alkaline solution and alkaline seawater can be improved, the overpotential can be reduced, the stability can be improved, and the alkaline seawater electrolysis process is more economical and efficient.

The invention belongs to the technical field of battery positive electrodes, and particularly relates to a solid solution positive electrode catalytic material for a lithium oxygen battery and a preparation method and application thereof. Comprising the following steps: firstly, growing a nickel-cobalt bimetallic precursor nanoneedle array on carbon paper by using a 1-octyl-3-methylimidazole chloride salt assisted hydrothermal method; then preparing a selenylation sample through a NaHSe solution; and step 3, cleaning the selenylation sample for multiple times, roasting in an argon atmosphere to remove excessive selenium, and synthesizing the Ni-doped CoSe2 solid solution nanoneedle array. The reaction conditions are mild and easy to control; the selenized material completely inherits the morphology of the precursor; and in the application of the lithium oxygen battery, the lithium oxygen battery still has excellent stability after multiple cycles, and enough discharge depth can be realized.

The invention relates to the technical field of costume design, in particular to a costume design line drawing device which comprises a line drawing seat, a smoothing assembly and a cleaning assembly, a placing groove is formed in the upper end of the line drawing seat, the smoothing assembly is arranged in the placing groove, first electric sliding rails are symmetrically arranged at the front and back of the upper end of the line drawing seat, and first electric sliding tables are slidably connected to the first electric sliding rails; a second electric sliding rail is arranged at the lower end of the support, a second electric sliding table is slidably connected to the second electric sliding rail, an electric telescopic rod is arranged at the lower end of the second electric sliding table, a mounting plate is arranged at the lower end of the electric telescopic rod, a line drawing end is arranged at the lower end of the mounting plate, and a cleaning assembly corresponding to the line drawing end is arranged on the mounting plate. When the line drawing device is used, when the line drawing end is used for drawing lines, paper scraps or carbon paper powder generated during line drawing can be conveniently collected through the arranged cleaning assembly, later cleaning is facilitated, the pollution problem in the line drawing process is solved from the source, and work and fabric cleanliness is kept.

The invention discloses a method for preparing fuel cell carbon paper from boron-modified thermosetting phenolic resin. The method comprises the following steps: adding phenol and boric acid in a molar ratio of 1: (0.25-0.45) into a reaction kettle, and reacting to obtain a phenyl borate solution; adding solid formaldehyde into the reaction kettle to react with the boric acid phenyl ester solution to obtain boron modified thermosetting phenolic resin; and impregnating the carbon paper precursor in the boron modified thermosetting phenolic resin impregnation liquid, baking, carrying out hot press molding, carbonizing, and graphitizing to obtain the fuel cell carbon paper. The conductivity, thermal conductivity, mechanical property and porosity of the carbon paper are improved, so that the performance of the carbon paper is comparable to that of Japanese Dongli carbon paper, and the conductivity is better.

The application discloses an amperometric current density stable MoS2 / Ni3S4 / CFP electrocatalyst and a preparation method and application thereof, and belongs to the technical field of electrocatalytic hydrogen evolution. The application constructs a heterojunction interface between MoS2 and Ni3S4 through a hydrothermal reaction, and MoS2 and Ni3S4 generate a heterojunction on a carbon paper substrate to obtain the amperometric current density stable MoS2 / Ni3S4 / CFP electrocatalyst. The preparation of the composite material comprises the following steps: (1) dissolving nickel salt, urea and ammonium fluoride in water, stirring, and then placing the obtained mixed solution A and carbon paper in a hydrothermal reaction kettle for one-time hydrothermal reaction to obtain a nickel hydroxide precursor; (2) dissolving molybdenum salt and thiourea in water, stirring, and then placing the obtained mixed solution B and the nickel hydroxide precursor in the hydrothermal reaction kettle for two-time hydrothermal reaction to obtain the catalyst. The catalyst improves the electron transfer rate, increases the number of active sites, and exhibits excellent hydrogen evolution reaction activity and stability in the water electrolysis process.

The invention belongs to the technical field of inorganic nano material synthesis, and discloses a transition metal selenide integrated electrode and a preparation method and application thereof, the preparation method comprises the following steps: (1) carrying out acid treatment on carbon paper to obtain acid-treated carbon paper; (2) carrying out electrochemical deposition by taking the carbon paper subjected to acid treatment as a working electrode and a mixed solution containing two transition metal nitrates as an electrolyte to obtain a layered double-metal hydroxide integrated electrode; and (3) in the presence of protective gas, immersing the layered double-metal hydroxide integrated electrode in a mixed solution of selenium powder and sodium borohydride, and carrying out a reaction to obtain the transition metal selenide integrated electrode. The transition metal selenide integrated electrode disclosed by the invention is used for electrocatalytic nitrogen reduction reaction and has excellent electrocatalytic activity.

The invention discloses a preparation method of an end-piece bipolar plate for a flow battery and a tool thereof, the preparation method comprises a substrate preparation method and an end-piece bipolar plate preparation method, and the substrate preparation method comprises stacking of a conductive film, a plastic film and a conductive grid, multiple times of hot pressing, cooling and cutting; the preparation method of the end plate bipolar plate comprises the steps of carbon paper positioning, hot pressing, rapid cooling and cutting. According to the scheme, the conductive grids are fully filled with the plastic glue through multiple hot pressing processes, the mechanical performance of the end plate bipolar plate is remarkably improved, and the cracking risk is reduced; by adding the conductive film, reducing the use amount of the plastic film and optimizing the conductive path, the bulk resistance is effectively reduced, and the operation efficiency of the stack is improved.

The invention discloses an electrochemical flexible carbon monoxide gas sensor based on composite hydrogel, which is characterized in that a composite hydrogel proton exchange membrane is used as a middle layer, flexible electrode layers are fixed on the upper surface and the lower surface of the composite hydrogel proton exchange membrane through an adhesive, and the outer part of an electrode is packaged by a PDMS (Polydimethylsiloxane) packaging layer; the composite hydrogel proton exchange membrane is a gel film; the flexible electrode layer adopts carbon paper loaded with a noble metal catalyst, and is combined on the upper surface and the lower surface of the composite hydrogel proton exchange membrane through chain winding and polymer plasticizing, so that the flexible electrode layer is tightly entangled with the proton exchange membrane; the PDMS packaging layer is doped with carbon black and has the surface super-hydrophobic property. The electrochemical flexible carbon monoxide gas sensor prepared by the invention can quickly respond to carbon monoxide with medium and low concentrations, can be carried on wearable equipment to realize safety monitoring, and has a good application prospect.

This invention provides a method for preparing highly hydrophobic carbon paper, belonging to the field of fuel cell technology. The method includes the following steps: Step 1, impregnating carbon paper in a mixed aqueous solution of transition metal organosalt and polymer; Step 2, drying the impregnated carbon paper and then spreading it evenly on nitrogen-containing organic powder, treating it in an inert atmosphere at a certain temperature range for a period of time to obtain a highly hydrophobic carbon paper. The fiber surface of the prepared carbon paper is covered with carbon nanotube arrays, and the water contact angle is greater than 145°. This invention significantly improves the hydrophobicity of carbon paper while also maintaining excellent electrical conductivity, and the process is simple, significantly improving fuel cell performance.

The invention belongs to the technical field of electrolysis, and particularly relates to a high-strength electrode plate and a preparation method and application thereof. The electrode plate comprises n substrate layers, (n-1) resin carbon layers, a first microporous layer and a second microporous layer, the electrode plate sequentially comprises a first microporous layer, a first substrate layer, a first resin carbon layer, a second substrate layer, a second resin carbon layer,..., an (n-1) th substrate layer, an (n-1) th resin carbon layer, an nth substrate layer and a second microporous layer from top to bottom, wherein n is 3-10. The resin carbon is filled in the substrate layers and between the substrate layers, a plurality of pieces of carbon paper form the high-strength, high-conductivity and high-breathability carbon paper suitable for electrolytic synthesis of hydrogen peroxide through ingenious design, and meanwhile, after the two sides of the carbon paper are designed to be coated with the compact microporous layers, on the premise that the oxygen diffusion capacity is guaranteed, the oxygen diffusion capacity is improved, and the oxygen diffusion efficiency is improved. Therefore, the electrode plate is suitable for electrolytic synthesis of hydrogen peroxide.

The application discloses a preparation method of a zinc-doped core-shell NiCo2O4 / NiCo-LDH three-dimensional heterostructure electrode material and application thereof. The preparation method of the electrode material is as follows: carbon paper is used as a substrate, NiCo2O4 nanowires are used as a core, zinc-doped NiCo-LDH nanosheets are used as a shell, a three-dimensional hierarchical core-shell structure is constructed, and a two-step hydrothermal method is adopted. The preparation method is simple in process, controllable in cost, and easy for large-scale production. The electrode material is applied to a sodium ion battery. Through zinc doping, oxygen vacancies are induced to be generated, an electronic structure is optimized, and a sodium ion embedding / extraction dynamic process is significantly accelerated. Excellent results are achieved in the application of the sodium ion battery, and a new strategy is provided for design and development of a high-performance sodium ion battery transition metal-based electrode material.

The application discloses a method for synthesizing Au-Pt nanowire arrays by an electrochemical deposition method on carbon paper with aniline as a ligand and application thereof, and can be applied to methanol electro-oxidation reaction. After growing gold nanowire arrays on a conductive substrate by using an electrochemical deposition method with aniline as a ligand, Au-Pt nanowires are synthesized by a secondary electro-deposition mode. The electrochemical deposition has controllable reduction capacity, convenient operation and environmental friendliness. The combination of gold nanowires and platinum (Pt) can significantly improve the activity of a catalyst. The diameter of gold-platinum nanowires prepared by the electrochemical deposition method assisted by an aniline ligand can reach 30 nanometers. The increase in the size is helpful to expand the electrochemical active surface area, thereby enhancing the electron transmission efficiency and further improving the electro-catalytic performance. The gold nanowires are integrated into platinum-based nanomaterials, and for an anode catalyst of a direct methanol fuel cell, the gold nanowires can significantly improve the catalytic efficiency of a methanol oxidation reaction.

The utility model discloses a hydrogen fuel cell carbon paper deformation detection device which comprises a universal testing machine, an experiment pressing block, an experiment cushion block, a polar plate carbon paper stacking structure, a video extensometer, a concentrated light source and a microscope, the polar plate carbon paper stacking structure is arranged between the experiment pressing block and the experiment cushion block, and the universal experiment machine is configured to provide continuously changing packaging force and uniformly transmit the packaging force to the polar plate carbon paper stacking structure through the experiment pressing block and the experiment cushion block, namely, the mechanical environment of carbon paper in a galvanic pile is simulated; the concentrated light source is configured to provide brightness, and the video extensometer and the microscope are configured to observe the form change of the carbon paper in the polar plate carbon paper stacking structure after continuous stress. The device simulates the in-pile mechanical environment through the universal testing machine, and directly observes the real form change of the carbon paper in the flow channel through the optical detection technology, thereby being beneficial to improving the cognition on the internal structure of the electric pile and guiding the design of the electric pile.

The application relates to a method for rapidly preparing a porous Cu / Zn heterojunction electrocatalytic material and application. The method utilizes a dynamic hydrogen bubble template method to prepare the heterojunction electrocatalytic material, and the preparation is carried out under the condition of a higher cathode deposition current. The specific steps are as follows: firstly, copper sulfate, zinc sulfate and ammonium sulfate are dissolved in deionized water according to a certain ratio to serve as an electrodeposition solution. The electrodeposition is carried out at room temperature, the deposition condition is controlled by using a direct current power supply, a hydrophilic carbon paper is used as a substrate electrode, and the porous Cu / Zn heterojunction material is deposited for 30 seconds under the condition of a deposition current of-1.0 A. The preparation scheme can realize in-situ rapid preparation of the porous material, the loading is uniform and stable, the operation process of a relatively cumbersome hard template method is avoided, and the electrocatalytic carbon dioxide reduction preparation carbon monoxide performance is very high.

A gas diffusion layer is provided. The gas diffusion layer includes a graphitized carbon paper having a fibrous structure and a non-fluorinated hydrophobic material disposed on and / or in the fibrous structure of the graphitized carbon paper. Methods of making a gas diffusion layer are also provided. The method comprises obtaining a graphitized carbon paper, applying a solution or emulsion comprising a non-fluorinated hydrophobic material, and drying the gas diffusion layer at a temperature of not more than 170 degrees Celsius. In addition, a microporous layer is provided. The microporous layer includes a porous substrate having a polymeric binder, wherein carbon particles and / or graphite particles are distributed in the polymeric binder. The microporous layer further includes a non-fluorinated hydrophobic material disposed on at least a portion of the porous substrate and / or in pores of the porous substrate. Fuel cells and electrolytic cells including the gas diffusion layer are also provided.

The invention relates to a membrane electrode mode in-situ infrared spectrum detection device applied to electro-catalytic reaction and application and method thereof, and an in-situ infrared pool comprises a counter electrode unit, a membrane electrode unit, a membrane electrode module, a membrane electrode module, a membrane electrode module and a membrane electrode module which are sequentially stacked from top to bottom, and the counter electrode unit comprises an electrolytic bath for containing electrolyte and a counter electrode placed in the electrolytic bath; a first spacer; an ion exchange membrane; a second spacer; a gas diffusion electrode loaded with a catalyst; the silicon prism is plated with a metal film and is engraved with a gas flow channel; the gas diffusion electrode transmits water through the hydrophilic surface and constructs a three-phase reaction interface through the hydrophobic surface; the ion exchange membrane is adhered to the first spacing piece, and the type can be changed; during reaction, gas enters through the flow channel and then reacts with water transmitted through the membrane on the carbon paper. The electrochemical workstation is used for providing stable voltage or current, monitoring the reaction process and collecting infrared spectrum signals of species during reaction on the surface of the hydrophobic carbon paper facing the silicon prism.

The application provides a large active area multi-channel visual fuel cell device capable of on-line operation, which comprises a transparent end pressing plate, a transparent end plate, a transparent end current collecting plate, a transparent end flow field plate, an MEA membrane electrode, a non-transparent end bipolar plate, a non-transparent end current collecting plate, carbon paper and a non-transparent end pressing plate arranged in sequence, one side of the transparent end plate is provided with a boss, the transparent end current collecting plate and the transparent end pressing plate are respectively provided with a hollow hole I and a hollow hole II matched with the boss, the position of the hollow hole II corresponds to the position of the boss, the boss is embedded in the hollow hole I, the upper surface of the boss is in the same horizontal plane with the upper surface of the transparent end current collecting plate, an observation area is formed, the transparent end flow field plate is provided with a flow field area I, and the position of the flow field area I corresponds to the position of the boss. The technical scheme of the application solves the problems of small active area, single flow channel and incapability of meeting the batch product detection requirement of the prior art visual fuel cell device.

The utility model discloses a carbon-free environment-friendly carbon paper guide roller stacking frame which comprises a frame formed by assembling a base, a vertical rod, a handrail and a transverse rod, a plurality of positioning assemblies formed by assembling U-shaped frames and gaskets are movably installed on the transverse rod, and a bracket is fixedly installed at the top of each U-shaped frame. Limiting rods are slidably mounted in the centers of the gaskets through elastic components, a plurality of inserting holes are formed in the bottom of the transverse rod at equal intervals, and the tops of the limiting rods extend to penetrate through the inserting holes so that the distance between the positioning assemblies can be adjusted according to the diameter of the guide roller. The guide roller positioning assembly capable of being flexibly adjusted is formed by matching the cross rod, the base, the gasket, the limiting rod and the spring, the position of the guide roller can be rapidly adjusted without complex tools or tedious operation steps, the problems that a traditional guide roller stacking frame is fixed through angle iron, and the distance cannot be compatible with multiple specifications are solved, and the guide roller stacking frame has high practicability.

This invention discloses a method for preparing a protein fiber modified porous electrode and its application, comprising: dissolving lysozyme in deionized water to obtain a lysozyme protein solution; stirring carbon paper in the lysozyme protein denaturing solution to obtain carbon paper with attached protein fibers; immersing the carbon paper with attached protein fibers in a Na2PdCl4 solution and ultrasonically treating it to denature Pd... 2+ Dispersed on carbon paper; after standing, the reducing agent NaBH4 is added, and the fiber surface changes from bright yellow to black, Pd 2+ The Pd atoms are reduced to Pd atoms and immobilized on protein-like fibers. After standing, the fibers are washed and dried to obtain a porous electrode. This invention addresses the problem of limited reaction area and catalytic activity inherent in traditional nanoelectrodes, which makes it difficult to fundamentally solve the problem of low catalytic efficiency. By modifying the protein fibers by immobilizing Pd clusters on the protein-like fiber template, the electrode efficiency is significantly improved compared to a single Pd catalyst.

This application belongs to the field of NbC material preparation technology, specifically a method for preparing niobium carbide by flash sintering and the niobium carbide itself. The preparation method includes the following steps: mixing niobium iron powder and carbon powder and pressing them into a compact, then vacuum drying to obtain a compact; placing the compact between two sheets of carbon paper and flash sintering it under vacuum, then cooling to obtain a sintered body; crushing and pulverizing the sintered body, then screening and separating it to obtain niobium carbide. This application utilizes flash sintering technology to significantly shorten the NbC preparation time, thereby reducing the production cycle, improving production efficiency, and significantly reducing energy consumption; the process flow is short, the operation is simple, and the reaction process is easy to control; by reducing the sintering temperature, shortening the process cycle, and reducing energy consumption, while ensuring the performance of NbC, the preparation cost and carbon emissions are effectively reduced, which is in line with the technological trend of green manufacturing and sustainable development.