402 results about "Carbon paper" patented technology

The invention belongs to the technical field of fuel cells, and particularly relates to carbon paper for a gas diffusion layer with a water-gas management function and a preparation method of the carbon paper. The carbon paper for the gas diffusion layer comprises at least three alternately stacked carbon layer structures, odd layers are macroporous carbon layers, and the macroporous carbon layers are formed by dipping carbon fiber base paper in a mixed solution of resin and a conductive material and drying the carbon fiber base paper; the even-numbered layers are small-hole carbon layers, and the small-hole carbon layers comprise resin and conductive materials and are coated on the surfaces of the odd-numbered layers; the odd-numbered layers and the even-numbered layers are compounded through a hot-pressing process to form a composite material; the composite material is subjected to high-temperature heat treatment to form a carbon paper A conductive network is formed in the carbon paper, the carbon paper with higher conductivity is prepared, part of the conductive material is filled in the carbon paper to build a microporous structure, the low-gram-weight base paper forms a macroporous structure, and the conductive material and the resin are mixed to form a microporous structure, so that the water and gas management capability is favorably improved.

The invention discloses a Cl-Bi carbon dioxide reduction electrocatalyst, a preparation method thereof and application of the Cl-Bi carbon dioxide reduction electrocatalyst in preparation of formic acid through catalytic reduction of carbon dioxide, and belongs to the technical field of electrocatalyst materials. The preparation method comprises the following steps: preparing a sodium chloride solution, adjusting the pH value with acid, adding Bi2O3, carrying out a stirring reaction, washing a reactant, and drying to obtain BiOCl; the preparation method comprises the following steps: dispersing BiOCl, carbon black and naphthol in ethanol, carrying out ultrasonic treatment to obtain ink, dripping the ink onto hydrophobic carbon paper, drying, and reducing under negative voltage to obtain the Cl-Bi carbon dioxide reduction electrocatalyst. The prepared Cl-Bi carbon dioxide reduction electrocatalyst is simple in preparation method, free of pollution, rich in raw material and low in price, and the Cl-Bi carbon dioxide reduction electrocatalyst has high formic acid production selectivity, high formic acid yield and excellent stability.

The invention discloses a thermally stable gas diffusion layer material and a fuel cell, and relates to the field of fuel cells. When the heat-stable gas diffusion layer material is prepared, short-cut polyacrylonitrile carbon fibers are subjected to papermaking and then cured, and 3-aminothiophene is oxidized and grafted to prepare a modified carbon paper base layer; the preparation method comprises the following steps: carrying out a reaction on a single-layer graphene oxide nanosheet, 6-amino-2-mercaptobenzothiazole and 3-aminoethyl thiophene to prepare a modified single-layer graphene oxide nanosheet; the preparation method comprises the following steps: reacting polyvinylidene fluoride powder, 3-allyl thiophene and single-ended vinyl silicone oil to prepare a modified polyvinylidene fluoride emulsion; and uniformly mixing the modified single-layer graphene oxide nanosheet, a modified polyvinylidene fluoride emulsion and isopropanol, spraying on the modified carbon paper base layer, and reacting with 3, 4-ethylenedioxythiophene to prepare the thermally stable gas diffusion layer material. The thermally stable gas diffusion layer material prepared by the method has excellent porosity, thermal stability, conductivity and corrosion resistance.

The invention discloses a full-automatic multi-station H-shaped flowing electrolytic tank experiment system and a control method thereof, and relates to the technical field of electrolytic tank experiments. Comprising an experiment table top, a mechanical arm is arranged on the top of the experiment table top, a carbon paper module frame is arranged on the top of the experiment table top, a TIP head box frame is arranged on the side, close to the carbon paper module frame, of the top of the carbon paper module frame, a sample bottle frame is arranged on the top of the experiment table top, and a penicillin bottle exchange frame is arranged on the top of the experiment table top. And five groups of H-shaped flowing electrolytic tanks are arranged at the top of the experiment table top and close to one side of the penicillin bottle exchange rack at equal intervals. According to the full-automatic multi-station H-type flowing electrolytic cell experiment system, through collaborative design of the mechanical arm, the quick-change clamp and multiple stations, full-process automation of catalyst coating, electrode assembling, electrolyte circulation, data acquisition and cleaning and sample reserving is achieved, parallel operation of multiple sets of experiments is supported, and the experiment efficiency is improved.

The invention belongs to the field of water electrolysis hydrogen production, and particularly relates to a membrane electrode and a blade coating preparation method and application thereof. The blade coating preparation method provided by the invention comprises the following steps: a) pressing a blade coating substrate to a certain thickness to obtain a pressed substrate; in the step a), the blade coating substrate is nickel foam, nickel felt or carbon paper; b) blade-coating the surface of the pressed substrate with catalyst slurry by using a blade coating machine, drying and hot-pressing to obtain a membrane electrode; in the step b), the ratio of the total mass of the catalyst powder and the binder in the catalyst slurry to the mass of the solvent is 1: (2-4); the distance between a scraper of the blade coater and the pressed substrate is 10-200 [mu] m; the blade coating speed ranges from 1 mm / s to 30 mm / s; the drying temperature is 50 to 90 DEG C. The membrane electrode is prepared by adopting a blade coating process under specific conditions, and the method has the advantages of good coating uniformity of the catalyst layer, high production efficiency and the like, and is particularly suitable for large-scale production of large-area membrane electrodes.

The present disclosure provides a conductive carbon paper and a preparation method and use thereof, which fall within the technical field of fuel cells. The conductive carbon paper includes a carbon fiber and a binder component, wherein the binder component contains an elastic aid; when a load of 1 MPa is applied in the thickness direction of the carbon paper, the bulk density thereof is 0.30-0.40 g / cm3. The preparation method of the conductive carbon paper is: preparing a carbon fiber base paper including the elastic aid, placing the same in a glue solution for impregnation, and then drying, curing, and carbonizing to obtain. The conductive carbon paper is used for a fuel cell to solve the technical problem that the electrical resistivity of the carbon paper is high when compressed and it is difficult to recover after compression.

The invention relates to a membrane electrode assembly and a fuel cell, the membrane electrode assembly comprises a catalyst layer (10), a gas diffusion layer (20) and a bipolar plate (30), the gas diffusion layer (20) comprises a porous layer (21) and a carbon paper layer (22), the bipolar plate (30) is provided with ridge parts (31) distributed at intervals, the top surfaces of the ridge parts (31) are in contact with the carbon paper layer (22), the carbon paper layer (22) is provided with carbon paper hydrophilic areas (221) distributed at intervals, and the carbon paper hydrophilic areas (221) are in contact with the porous layer (21). The porous layer (21) is provided with porous hydrophilic areas (211) which are distributed at intervals, the porous hydrophilic areas (211) correspond to the carbon paper hydrophilic areas (221), a part of each carbon paper hydrophilic area (221) is overlapped with a local area of the corresponding ridge part (31), and another part of each carbon paper hydrophilic area (221) is located in a runner area (32). The membrane electrode assembly can improve the electric pile performance under high current density, improve the electric pile power generation efficiency, and improve the whole system efficiency from the system level.

The invention relates to the technical field of gas diffusion layers, and discloses a preparation method and application of a crystalline porous material doped gas diffusion layer, and the preparation method comprises the following steps: S1, adding 6-9 parts by mass of carbon black, a crystalline porous material, 0.1-0.2 part by mass of a thickening agent, 2-4 parts by mass of a water repellent agent and 5-8 parts by mass of a dispersing agent into 75-85 parts by mass of a solvent, and uniformly stirring; wherein the mass ratio of the carbon black to the crystalline porous material is 1: (0.3-1.5), stirring and defoaming to obtain microporous layer slurry; and S2, coating carbon paper subjected to hydrophobic treatment with the microporous layer slurry, and then sequentially drying and sintering to obtain the gas diffusion layer. The gas diffusion layer is prepared from the crystalline porous material with a stable structure and uniform pore size, so that the gas-liquid transmission capability of the gas diffusion layer can be enhanced, the performance of the fuel cell is further improved, and the service life of the fuel cell is further prolonged.

The invention discloses a method for synthesizing glycine by coupling oxalic acid with nitrate under the electro-catalysis of a molecular catalyst lead phthalocyanine, and belongs to the technical field of materials and electro-catalysis. The method comprises the following steps: uniformly mixing lead phthalocyanine, a dispersing agent and a binding agent to prepare catalyst slurry; loading the catalyst slurry on carbon paper to obtain carbon paper containing a catalyst; an H-type electrolytic tank is assembled, in the H-type electrolytic tank, an electrolyte of an anode chamber is a sulfuric acid solution, an electrolyte of a cathode chamber is a sulfuric acid solution containing oxalic acid and potassium nitrate, and the cathode chamber and the anode chamber are separated through an ion exchange membrane; a calomel electrode is inserted into the cathode chamber as a reference electrode, carbon paper containing a catalyst is used as a working electrode, a platinum sheet is inserted into the anode chamber as a counter electrode, and glycine is obtained through electrolysis. The glycine is prepared by using the lead phthalocyanine as the catalyst, so that the reaction efficiency can be effectively improved, the reaction energy consumption is reduced, and the production process is simplified.

The invention discloses a Joule thermal preparation method of a silicon-based composite material compounded by a silicon-based phase and a metal phase and application of the Joule thermal preparation method in a lithium ion battery, and relates to the technical field of lithium ion battery negative electrode materials, and the Joule thermal preparation method specifically comprises the following steps: S1, obtaining a silicon-based original material compounded by the silicon-based phase and the metal phase by adopting a suspension smelting and rapid quenching technology; s2, mixing the silicon-based original material with a conductive agent, and obtaining a silicon-based original material-conductive agent powder material through a sanding technology; and S3, placing the silicon-based original material-conductive agent powder material in rolled carbon paper, clamping the carbon paper at two ends of an electrode, introducing current, raising the temperature of the carbon paper to the highest temperature within a certain time through Joule heat generated by pulse discharge, and preparing the silicon-based composite particles on the carbon paper by using the Joule heat, the silicon-based composite material is obtained. The method disclosed by the invention is simple to operate, good in process controllability, high in yield and low in cost, and shows excellent comprehensive performance in the lithium ion battery.

The invention discloses a carbon-based aqueous zinc ion supercapacitor and a preparation method thereof, and belongs to the technical field of zinc ion supercapacitors. The capacitor comprises a positive electrode, a negative electrode, a multi-element electrolyte and a porous diaphragm, the anode is an activated carbon composite material; the negative electrode is a rolled zinc foil; the multi-element electrolyte is a mixed system aqueous solution formed by dissolving zinc trifluoromethanesulfonate, zinc sulfate, zinc chloride, zinc perchlorate and an electrolyte additive in deionized water; and the porous diaphragm is glass fiber. The preparation method comprises the following steps: uniformly mixing the activated carbon composite material, the conductive black and the binder in proportion, adding the organic solvent, grinding into slurry, coating the slurry on the carbon paper, performing vacuum drying to obtain the positive electrode plate, and assembling the positive electrode plate with the multi-element electrolyte, the negative electrode and the porous diaphragm. The raw material cost and the energy consumption are low, the operability is greatly improved, and the repeatability is good.

The invention provides carbon paper for a fuel cell, a preparation method of the carbon paper and the fuel cell, and the preparation method of the carbon paper for the fuel cell comprises the following steps: providing a polytetrafluoroethylene film, and preparing slurry which comprises graphitized carbon fibers, carbon nanotubes, polytetrafluoroethylene emulsion, phenolic resin dry powder, ethylene glycol, deionized water and triton; coining the slurry on the polytetrafluoroethylene film by using the polytetrafluoroethylene film as a substrate and adopting a silk-screen printing process to prepare a carbon paper blank; putting the carbon paper blank into a drying oven for curing, and stripping the polytetrafluoroethylene film in the cured carbon paper blank to obtain initial carbon paper; and putting the initial carbon paper into a drying oven, and sequentially carrying out carbonization treatment and graphitization treatment under atmosphere protection to prepare the carbon paper. The method is simple in process, controllable in cost and easy for large-scale production, and the prepared carbon paper has good porosity, high transverse conductivity and high transverse gas permeability.

The invention relates to a method for preparing carbon paper by blending PVA fibers and carbon fibers into a net, and relates to the technical field of carbon paper preparation, and the method comprises the following steps: (1) respectively opening carbon fibers and water-soluble polyvinyl alcohol fibers, mixing the two fibers in proportion, carding, lapping and reinforcing to prepare a preform with the gram weight range of 60-270g / m < 2 >; (2) reducing the preform with hot water to remove polyvinyl alcohol fibers, and then drying to obtain a uniform carbon paper preform with the gram weight of 10-180g / m < 2 >; (3) impregnating the carbon paper preform in resin, drying, and performing hot press molding to obtain a carbon paper base material; and (4) performing low-temperature carbonization and high-temperature graphitization treatment on the carbon paper base material in an oxygen-free environment to obtain a carbon paper finished product. The carbon fiber web forming method has the advantages that the carbon fiber web forming difficulty is reduced, meanwhile, continuous and stable carbon web forming can be achieved, and then continuous carbon paper can be rapidly prepared.

The invention discloses a method for improving the selectivity of electrocatalytically reducing acetylene into 1, 3-butadiene by using a copper hydroxide hydrophobic nano array, which comprises the following steps: soaking a copper mesh in a mixed solution of NaOH and (NH4) 2S2O8 to obtain a Cu (OH) 2 self-supporting nano array, and then soaking in an ethanol solution of 1-dodecyl mercaptan to obtain a Cu (OH) 2 hydrophobic self-supporting nano array modified by 1-dodecyl mercaptan. A hot press is adopted to tightly press the dried hydrophobic self-supporting nano array and carbon paper to form a working electrode, a cathode chamber and an anode chamber are separated through an anion exchange membrane, electrolyte is composed of a KOH solution, and a peristaltic pump is used to enable a liquid phase to continuously circulate. According to the method, acetylene is subjected to electrocatalytic reduction to obtain 1, 3-butadiene by adopting a three-electrode system, and high-selectivity conversion of acetylene into 1, 3-butadiene is realized.

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 invention relates to an ultra-small platinum-ruthenium-iron-cobalt-nickel-copper high-entropy alloy particle / carbon paper composite material and a preparation method and application thereof. Metal chloride and carbon paper serve as raw materials, the ultra-small platinum-ruthenium-iron-cobalt-nickel-copper high-entropy alloy particle / carbon paper composite material us-HEA / CFP is prepared through a solvothermal method and high-temperature thermal shock, and the preparation method comprises the following steps that a, a platinum-ruthenium-iron-cobalt-nickel-copper precursor / carbon paper is prepared through the solvothermal method; b, the precursor is subjected to high-temperature thermal shock to prepare us-HEA / CFP, the overpotentials under the current density of-100 mA / cm <-2 >,-500 mA / cm <-2 > and-1000 mA / cm <-2 > are only 31.4 mV, 69.2 mV and 102.5 mV respectively, and the Tafel slope is 28.9 mV dec-1. When the temperature is 60 DEG C, an anion exchange membrane electrolytic cell constructed by taking us-HEA / CFP as a cathode needs the voltage of 1.94 V to reach the industrial-grade current density of 1000 mA cm <-2 >, and the anion exchange membrane electrolytic cell can stably operate for 500 hours under the current density, so that the anion exchange membrane electrolytic cell shows great practical application potential. The method can be expanded to design of other high-entropy materials, and a new idea is provided for efficient preparation of an electrocatalyst with excellent performance.

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.

This invention discloses a method for preparing a tufted nickel-cobalt hydroxide nanomaterial modified electrode material. The tufted nickel-cobalt hydroxide is prepared on carbon paper using a constant potential method. The electrolyte is a solution of nickel sulfate and cobalt sulfate. The specific operation is as follows: S1. Carbon paper pretreatment; S2. Electrode preparation is a solution containing nickel sulfate and cobalt sulfate; S3. Electrode preparation finally obtains the tufted electrode material.

The application discloses a kind of silicon dioxide carbon tube membrane electrode and its construction method and application.The construction process of the membrane electrode is as follows: carbon-based metal catalyst or the mixture of carbon-based metal catalyst and silicon dioxide carbon tube is dispersed in water, then organic solvent and binder solution are added in turn, to obtain catalyst ink;The catalyst ink is sprayed on carbon paper, and heat treatment is carried out in a protective atmosphere to obtain a gas diffusion electrode.If the aforementioned does not add silicon dioxide carbon tube, silicon dioxide carbon tube-organic solvent solution needs to be sprayed on the surface of the catalyst layer.The electrode is modified by silicon dioxide carbon tube, which on the one hand constructs a long-range ordered proton transport channel of membrane-catalyst-silicon dioxide carbon tube, and on the other hand adjusts the PA distribution in the membrane electrode assembly, suppresses PA loss, and improves the overall performance of the electrode.When applied to proton exchange membrane fuel cells, it can effectively solve the problems of poor stability, low activity and catalyst deactivation under high temperature conditions.

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 invention relates to high-conductivity and lithium-loving carbon paper and a preparation method and application thereof.The preparation method comprises the steps that firstly, a flexible porous carbon paper substrate which is of a three-dimensional porous structure and is high in flexibility and excellent in conductivity is constructed through phenolic resin dipping, hot-pressing curing and high-temperature carbonization; then, a target-free activation process is adopted, tannic acid and Fe < 3 + > are chelated and modified on the surface of the carbon paper, Ag < + > is reduced in situ, silver nanoparticles are generated and serve as catalytic sites, and a silver nanoparticle catalytic layer is prepared; then, a nickel-based metal coating is deposited on the surface of the carbon paper through chemical plating, so that the carbon paper is endowed with good conductivity; and a high-lithium-affinity electrosilvering layer is further constructed through electrosilvering, so that the wettability of the carbon paper and molten lithium is greatly improved, subsequent uniform nucleation and deposition of lithium are induced, and the CF (at) Ag-Li lithium metal composite negative electrode is prepared. Compared with the prior art, the carbon paper material disclosed by the invention has remarkable advantages in the aspects of improving lithium deposition stability, inhibiting dendritic crystal growth and relieving volume expansion, and is suitable for constructing a high-specific-energy and high-safety lithium metal battery.

The present invention discloses a production process for carbon paper base for a gas diffusion layer, comprising the following steps: S1: preparing a suspended slurry; S2: papermaking, pressing, heating to T1, and drying to obtain a first base paper; S3: applying an aqueous resin dispersion containing conductive particles to the first base paper, heating to T2 for pre-drying, and obtaining a second base paper; S4: continuously spraying water onto the second base paper in a mist-like manner, non-contact heating the second base paper to T3, dissolving the first water-soluble fiber in the second base paper, and pressing and drying to obtain a third base paper; S5: hot pressing and carbonizing the third base paper to obtain a carbon paper base for a gas diffusion layer; T1 and T2 are lower than the water-soluble temperature of the first water-soluble fiber, and T3 is higher than the water-soluble temperature of the first water-soluble fiber and lower than the water-soluble temperature of the second water-soluble fiber. This production process for carbon paper base for a gas diffusion layer is advantageous in reducing the resistivity of the flocs and improving the porosity and air permeability of the carbon paper base paper. The present invention also discloses a carbon paper.

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 preparation method of an oxyacid radical modified graphite-based cathode for electro-catalysis hydrogen peroxide synthesis. An oxyacid (sulfuric acid or phosphoric acid) and nitric acid are compounded to form a mixed acid solution, and the graphite-based electrode is subjected to oxyacid radical modification by using the mixed acid solution. The preparation method of the oxygen-containing acid modified graphite-based electrode is simple and low in cost, does not need harsh conditions such as high temperature and the like, and has great industrial and large-scale production potential; the oxygen-containing acid radical modified graphite-based cathode prepared by an acid treatment method is used for reducing oxygen to produce hydrogen peroxide, the yield of the hydrogen peroxide exceeds 21.79 mg.cm <-2 >. H <-1 > and is increased by about 20 times compared with the yield (1.13 mg.cm <-2 >. H <-1 >) of oxygen oxidation by using unmodified original commercial carbon paper, and meanwhile, the highest selectivity of the hydrogen peroxide is up to 97.5%.

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 present invention belongs to the field of catalyst preparation technology, specifically to a method for preparing a CoNiFe-based catalyst for hydrogen production by water electrolysis. A CoNiFe-based precursor is first calcined to obtain a metal oxide powder, which is then mixed with carbon black and ball-milled before secondary calcination to obtain the CoNiFe-based catalyst. This catalyst is then loaded onto a carbon paper surface as a working electrode to construct a three-electrode system for water electrolysis, exhibiting dual catalytic performance for both OER and HER.

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 invention belongs to the technical field of hydrogen production through water electrolysis, and particularly relates to a method for simulating and researching uniformity of a flow field in an electrolytic bath, which comprises the following steps: introducing water with rated flow into an inlet and outlet end plate; after the bubbles are completely discharged and the water flow is stable, adding a coloring agent into a water source, and recording the diffusion process of colored water flowing from an inlet to an outlet in each flow channel; introducing a hydrogen peroxide solution with a certain concentration into the inlet and outlet end plate; when the hydrogen peroxide solution flows in the runner, the hydrogen peroxide solution is in contact with manganese dioxide dispersed in the catalyst carbon paper to be decomposed, oxygen is separated out on the surface of the carbon paper, and the condition that oxygen is separated out from GDL during electrolysis operation is simulated; after flowing is stable, a coloring agent is added through an inlet connector, and the process that the colored water-gas two-phase flow in each flow channel flows from an inlet to an outlet is recorded. According to the invention, the process of separating oxygen from GDL can be simulated without using a proton exchange membrane and electrifying, and the real condition in the electrolytic cell is reduced.