445 results about "Cathode catalyst" patented technology

The invention relates to an anion exchange membrane based on isopropyl piperidone and biphenyl and a preparation method of a membrane electrode, the preparation method comprises the following steps: respectively dissolving an aromatic monomer and IPD in a first solvent, and mixing to obtain a mixed solution, the aromatic monomer being BP or TP; dropwise adding an acidic initiator into the mixed solution for reaction at the reaction temperature of-5 DEG C to 0 DEG C to obtain a nitrogen heterocyclic ring polymer intermediate; adding a quaternization reagent into the nitrogen-containing heterocyclic ring polymer intermediate to realize quaternization modification of nitrogen atoms to obtain a quaternization ionomer; and forming a film to obtain the AEM film. The preparation method of the membrane electrode comprises the following steps: respectively forming a cathode catalyst layer and an anode catalyst layer on two opposite sides of an AEM membrane through ultrasonic spraying to obtain the MEA. The AEM membrane and the MEA obtained according to the invention have the characteristics of excellent stability and high water electrolysis performance, can significantly improve the efficiency and durability of AEMWE, and are suitable for the fields of hydrogen production by water electrolysis and the like.

The invention relates to the technical field of proton exchange membrane fuel cell cathode catalysts, and discloses a nanoscale high-entropy intermetallic compound catalyst and a preparation method and application thereof. According to the nanoscale high-entropy intermetallic compound catalyst, a nitrogen-doped porous carbon material derived from zeolite imidazole skeleton-8 is taken as a carrier, and the metal elements of a high-entropy intermetallic compound comprise platinum, copper, cobalt, nickel and iron or platinum, ruthenium, copper, cobalt, nickel and iron. The preparation method of the catalyst comprises the following steps: step 1, preparing a zeolite imidazole framework 8; 2, preparing and purifying a nitrogen-doped porous carbon material carrier; step 3, loading a metal precursor; and 4, preparing the nano-scale high-entropy intermetallic compound catalyst. Nanoscale, high dispersity and structure ordering of the high-entropy intermetallic compound are achieved, the high-entropy intermetallic compound serves as a PEMFC cathode catalyst, the ORR quality activity and durability can be remarkably improved, and Pt loading capacity and cost are effectively reduced.

The present invention provides a catalyst-layer-equipped electrolyte membrane and an application of the same, said catalyst-layer-equipped electrolyte membrane comprising: an anode catalyst layer containing an ionomer and an anode catalyst component that is composed of iridium-containing manganese dioxide, the molar ratio of iridium to manganese in the anode catalyst component being 0.011-0.182, and the logarithm log(amount of ionomer / amount of anode catalyst component) of the ratio of the amount of the ionomer to the amount of the anode catalyst component being −1.40 to −0.46; a proton exchange membrane; and a cathode catalyst layer.

The invention relates to a membrane electrode with high oxygen permeability and a preparation method thereof, the membrane electrode comprises a proton exchange membrane, an anode catalyst layer and a cathode catalyst layer, the anode catalyst layer and the cathode catalyst layer are arranged on two sides of the proton exchange membrane, and anode catalyst slurry comprises an anode catalyst, an ionomer and a dispersing solvent in a mass ratio of 1: (1-10): (10-1000); the cathode catalyst slurry comprises a cathode catalyst, an ionomer, an ionic liquid and a dispersing solvent in a mass ratio of 1: (1-10): (1-10): (10-1000). Compared with the prior art, in order to solve the problem that oxygen mass transfer of a porous carbon carrier in a fuel cell catalyst layer is difficult, the method that ionic liquid and ionomer are mixed in advance, then slurry is prepared, and the slurry is sprayed to prepare the membrane electrode is adopted, so that a compact structure formed by an ionomer membrane on the surface of a catalyst is weakened, and the distribution uniformity of the ionomer membrane is improved; the local oxygen mass transfer resistance is obviously reduced, and the performance of the fuel cell under high current density is improved.

The invention provides a self-humidifying CO2 membrane electrode structure and a preparation method thereof. The self-humidifying CO2 membrane electrode structure comprises an electrolyte isolation plate, the electrolyte isolation plate is provided with an anode side and a cathode side, the anode side is sequentially provided with a cation exchange membrane, an anode catalyst layer, a current collector and an anode electrode plate, and the cathode side is sequentially provided with an anion exchange membrane, a cathode catalyst layer and a cathode electrode plate; the anode electrode plate is provided with a first inlet, hydrogen enters the anode electrode plate from the first inlet and is subjected to a hydrogen oxidation reaction under the action of an anode catalyst to generate protons and electrons, and the protons are migrated to the electrolyte isolation plate through the cation exchange membrane; the cathode electrode plate is provided with a second inlet, CO2 gas enters the cathode electrode plate from the second inlet and is subjected to a reduction reaction under the action of a cathode catalyst to generate a reduction product and OH <->, and OH <-> is migrated to the electrolyte isolation plate through the anion exchange membrane to react with protons. The long-term operation stability of the membrane electrode structure is remarkably improved.

The invention discloses a fuel cell cathode catalyst and a preparation method thereof, and belongs to the technical field of fuel cells. The preparation method of the fuel cell cathode catalyst comprises the following steps: adding a modified multi-walled carbon nanotube into a chloroplatinic acid aqueous solution with the mass concentration of 5g / L, carrying out ultrasonic treatment at 30-50 DEG C for 1-2 hours, and then carrying out freeze drying; and putting the dry powder into a horizontal tube furnace, introducing inert gas as protective gas, heating to 450-500 DEG C, preserving heat for 1 hour, cooling to room temperature along with the furnace, and taking out to obtain the fuel cell cathode catalyst. The modified multi-walled carbon nanotube is MWCNT / PEI / 5-formyl-2-thiopheneboronic acid, and the 5-formyl-2-thiopheneboronic acid is grafted after the PEI is grafted on the surface of the MWCNT, so that the dispersity of the MWCNT can be obviously improved, the agglomeration phenomenon of the MWCNT is reduced, the dispersion is more uniform, the loading capacity of platinum is high, the electrocatalytic activity of the catalyst is obviously enhanced, and the dosage of platinum is reduced.

The invention relates to the technical field of new energy materials, and discloses a gradient porous three-dimensional interpenetrating network direct ammonia fuel cell membrane electrode. The gradient porous three-dimensional interpenetrating network direct ammonia fuel cell membrane electrode comprises an exchange membrane, an anode catalyst layer, a cathode catalyst layer and a gas diffusion layer, wherein the anode catalyst layer and the cathode catalyst layer have gradient pore size distribution from the exchange membrane side to the gas diffusion layer side; wherein the interiors of the anode catalyst layer and the cathode catalyst layer are provided with three-dimensional interpenetrating network structures. According to the invention, the utilization rate of the catalyst is improved by 30-50%, the mass transfer resistance is reduced by 40-60%, the interface contact is improved, the controllability of the preparation process is improved, the structural stability is enhanced, the power density of the direct ammonia fuel cell reaches 250-300mW / cm < 2 >, the performance retention rate after 5000 cycles can reach 85% or more, and the method has remarkable technical advantages and application prospects.

The invention provides a CoCe-SNC catalyst and a preparation method and application thereof, and belongs to the technical field of hydrogen fuel cell / metal air cell cathode catalysts. The preparation method comprises the following steps: mixing and grinding a metal organic framework ZIF-8 and KSCN, carrying out first pyrolysis, compounding the obtained nitrogen and sulfur-containing co-doped carbon with two metal complexes Co-PM and Ce-PM, and carrying out second pyrolysis to obtain the CoCe-SNC diatomic catalyst. According to the invention, the two-dimensional lamellar structure carbon material and the asymmetric coordination diatomic metal are compounded, so that the catalytic performance of the whole catalyst is improved, and meanwhile, the yield of hydrogen peroxide generated by side reaction is reduced. The catalyst is applied to a hydrogen fuel cell / metal air cell, and the defects that in the prior art, a noble metal catalyst is high in cost, and a non-noble metal catalyst is low in catalytic activity, high in hydrogen peroxide yield, poor in catalyst stability and the like are overcome.

The application discloses a platinum-based high-entropy intermetallic compound and a preparation method and application thereof as a hydrogen fuel cell cathode catalyst, and belongs to the field of fuel cells.The preparation method comprises the following steps: S01, adding platinum salt, at least five other metal salts and a nitrogen-rich organic compound into an organic solvent, uniformly mixing, and obtaining a metal precursor mixed solution; S02, adding a carbon carrier into the metal precursor mixed solution, fully mixing, drying, collecting, and obtaining a precursor; and S03, heat treating the dried precursor under a reducing atmosphere, and performing heat preservation treatment, so as to obtain the platinum-based high-entropy intermetallic compound.The preparation method is simple, low in cost and good in repeatability, the prepared catalyst has the advantages of uniform particle size and high oxygen reduction activity, and has a good development prospect in the field of hydrogen fuel cell catalyst applications.

The invention relates to a membrane electrode and application thereof in deuterium-enriched water, and belongs to the field of clean energy development and utilization. The membrane electrode comprises a proton exchange membrane, an anode catalyst and a cathode catalyst, the anode catalyst is an iridium / iridium oxide catalyst with a three-dimensional porous network structure, and the cathode catalyst is a platinum-ruthenium alloy catalyst. The preparation method comprises the following steps: coating one side of the N117 proton exchange membrane with the anode catalyst, coating the other side of the N117 proton exchange membrane with the cathode catalyst, and then performing hot pressing to prepare the membrane electrode. The method comprises the following steps: assembling a membrane electrode into an electrolytic cell, and electrolyzing water by using the electrolytic cell to realize deuterium enrichment. The membrane electrode and the electrolytic cell are reasonable in design, the preparation process is simple and controllable, and the obtained product is high in efficiency and long in service life when used for enriching deuterium and facilitates industrial application.

The invention relates to the technical field of fuel cells, and provides a method and a device for optimizing operation conditions of a proton exchange membrane fuel cell. The method comprises the following steps: simulating the proton exchange membrane fuel cell according to a local dimension reduction single cell model and initial operation conditions of the proton exchange membrane fuel cell to obtain initial effective output power; sequentially increasing each initial parameter value under the initial operation condition to obtain a target operation condition; simulating the proton exchange membrane fuel cell again according to the target operation condition and the local dimensionality reduction single cell model to obtain the target saturation of liquid water of the cathode catalyst layer and the target effective output power; and obtaining a performance evaluation value corresponding to the target operation condition according to the initial effective output power, the target effective output power and the target saturation degree of the liquid water of the cathode catalyst layer, so as to determine the target operation condition corresponding to the performance evaluation value as the optimal operation condition. By adopting the method, the precision of the performance evaluation value can be improved, and the optimization effect of the operation condition is further improved.

The invention belongs to the technical field of fuel cells, and relates to a microporous layer with a humidity self-adjusting function and a preparation method thereof, and the microporous layer with the humidity self-adjusting function is of a hydrophilic and hydrophobic mixed structure and is arranged between a cathode catalyst layer and a cathode gas diffusion layer. Comprising a carbon material, a hydrophobic polymer and a ceramic oxide modified by a sulfonic acid group, the proton exchange membrane fuel cell adopting the microporous layer has a humidity self-adjusting function during working; the preparation method comprises the following steps: uniformly dispersing a carbon material and a ceramic oxide modified by a sulfonic acid group in ethanol and / or isopropanol to obtain a dispersion liquid, adding a water repellent agent into the dispersion liquid, uniformly mixing to obtain a microporous layer slurry, and finally coating the microporous layer slurry on the gas diffusion layer to obtain the gas diffusion layer. And drying at a constant temperature to obtain the microporous layer with the humidity self-adjusting function. With the adoption of the microporous layer, the comprehensive performance and the long-term stability of the fuel cell can be remarkably improved; the preparation method is simple.

Provided is an electrolyte membrane with a catalyst layer, which is capable of suppressing a reduction in the output of a fuel cell while reducing the production cost. The present invention is a catalyst layer-equipped electrolyte membrane having a cathode catalyst layer on one surface of the electrolyte membrane and an anode catalyst layer on the other surface, the cathode catalyst layer and the anode catalyst layer each containing platinum, the electrolyte membrane has a transmittance ratio TR50 (TH50 / TO50) of hydrogen gas transmittance (TH50) to oxygen gas transmittance (TO50) at 65 DEG C and 50% RH of 3.0 or more, and satisfies the following condition 1 and / or condition 2. < Condition 1 > The ratio (CPt / APt) of the amount of platinum (CPt) per unit area of the cathode catalyst layer to the amount of platinum (APt) per unit area of the anode catalyst layer is 2.0 or more. < Condition 2 > The ratio TAn / TCa of the thickness (TCa) of the cathode catalyst layer to the thickness (TAn) of the anode catalyst layer is less than 0.40.

The invention belongs to the technical field of lithium-carbon dioxide batteries, and particularly relates to a lithium-carbon dioxide battery positive electrode catalyst, a preparation method and a lithium-carbon dioxide battery. Comprising the following steps: taking iron, cobalt, nickel and copper as templates, respectively grinding and mixing with 1, 2, 4, 5,-tetracyanobenzene, sintering under a vacuum condition, respectively coordinating the 1, 2, 4, 5,-tetracyanobenzene with metal ions to form polymer monomers, and polymerizing the polymer monomers to form iron polyphthalocyanine, thereby obtaining the lithium-carbon dioxide battery positive electrode catalyst. The iron polyphthalocyanine is adopted as the positive electrode catalyst of the lithium-carbon dioxide battery, so that the generation of lithium oxalate is realized, the discharge voltage is improved to be higher than a theoretical value 3.01 V, the charging voltage is reduced, and the energy efficiency of the battery is improved.

The invention discloses a layered structure solid oxide fuel cell composite cathode catalyst as well as a preparation method and application thereof, and belongs to the field of solid oxide fuel cells. The invention aims to solve the problem that the electro-catalytic performance and low-oxygen reduction reaction activation energy of the existing medium-temperature solid oxide fuel cell are poor. The Sr2. 9Ca0. 1Fe2O7-CuO composite cathode catalyst is prepared by adopting a sol-gel method and a solid phase method, the components in a sol-gel system are in a nanometer range, the reaction is easier to carry out, the reaction temperature is low, the prepared materials are uniformly mixed, and the sol-gel method is carried out in a solution, so that even if the content of doped elements is very low, the doping can be easily realized; the material is prepared by adopting a solid phase method, and the method has the advantages of convenience in operation, simple synthesis process, uniform particle size, no agglomeration of powder particles, good filling property, low cost, high yield and the like, so that the electrochemical performance of the cathode catalyst is improved, and the method is convenient to operate and suitable for industrial production.

The invention provides a cathode catalyst for a fuel cell, a preparation method of the cathode catalyst and a membrane electrode containing the cathode catalyst, and relates to the technical field of fuel cells. According to the preparation method of the cathode catalyst for the fuel cell, a spherical urea-formaldehyde resin carbon carrier is adopted as a carbon carrier precursor, and the spherical urea-formaldehyde resin carbon carrier has the advantages of high mechanical strength and large packing density and also has rich surface functional groups and rich nitrogen elements. Therefore, the spherical urea-formaldehyde resin carbon is used as a carbon carrier precursor to synthesize the fuel cell catalyst, the obtained catalyst is high in mechanical strength and stable in structure, and the problem that pores of a catalyst layer become smaller in the hot pressing process of the fuel cell catalyst layer can be effectively solved. Besides, the cathode catalyst is prepared by adopting a microwave heating method, the obtained noble metal particles are small and uniform in particle size, relatively narrow in particle size distribution range and good in catalytic activity, and the microsphere morphology of the spherical urea-formaldehyde resin carbon can be fully reserved by adopting the microwave heating method.

A surface-modified catalyst, a multilayer cathode and a system for the electrochemical reduction of carbon dioxide in an acidic medium releasing protons are described. More particularly, the surface-modified catalyst, the multilayer cathode and the system comprise least one heterocyclic organic molecule preventing protons from accessing an active site on a surface of the cathode catalyst material to decrease an hydrogen evolution reaction, as compared to the absence of said heterocyclic organic molecule. The use of the surface-modified catalyst, the multilayer cathode and the system for the production of multicarbon products as well as their processes of manufacturing are also described. Finally, also described are methods for electrochemical production of a multicarbon product using the multilayer cathode and the system.

A membrane electrode for the preparation of hydrogen peroxide by means of oxygen reduction, a preparation method therefor, and a membrane electrode reactor. The membrane electrode comprises a cathode oxygen reduction electrode, a cation exchange membrane and an anode oxygen evolution electrode, which are stacked, wherein the cation exchange membrane is located between the cathode oxygen reduction electrode and the anode oxygen evolution electrode, and every two of the cathode oxygen reduction electrode, the cation exchange membrane and the anode oxygen evolution electrode are physically connected; the cathode oxygen reduction electrode comprises a cathode porous substrate layer and a cathode active layer, the cathode active layer comprising a cathode catalyst and a cation regulating and controlling material; and the anode oxygen evolution electrode comprises an anode porous substrate layer and an anode active layer, the anode active layer comprising an anode catalyst. The membrane electrode is suitable for the preparation of hydrogen peroxide by means of oxygen reduction, and has good hydrogen peroxide selectivity and high Faraday efficiency.

To provide a carbon dioxide reduction electrode for methane synthesis having high methane selectivity.SOLUTION: Provided are a carbon dioxide reduction electrode for methane synthesis, a method for producing the same, and a carbon dioxide electrolysis cell for methane synthesis. The carbon dioxide reduction electrode for methane synthesis comprises a cathode gas diffusion layer and a cathode catalyst layer in this order. The cathode catalyst layer has a layer containing Cu particles and a layer provided on a part of the layer containing Cu particles and containing at least one kind of metal particles selected from the group consisting of Ag particles, Zn particles, Sn particles, and Al particles, in this order from the cathode gas diffusion layer side.SELECTED DRAWING: None

The invention discloses a membrane electrode with a nanowire conductive network, and a preparation method and application thereof, and belongs to the technical field of membrane electrodes and preparation thereof. The membrane electrode comprises a cathode catalyst layer, a proton exchange membrane layer, an iridium-based catalyst layer and a nanowire conductive grid layer which are arranged in sequence, the nanowire conductive grid layer is formed by metal nanowires, perfluorinated sulfonic acid resin and an organic polymer thickening agent; the metal nanowire is one or more of a platinum nanowire, a gold nanowire and a palladium nanowire. Due to the addition of the nanowire conductive grid layer, the thickness of the catalyst layer of the anode can be increased; the catalytic material for forming the grid is mainly slender metal platinum nanowires (gold and palladium nanowires), the electric contact between the anode catalytic layer and the PTL can be improved, the utilization rate of the catalyst is increased, the nanowires in the grid can be cross-linked to form a conductive network, the total amount of precious metal can be reduced, the cost is remarkably reduced, and the service life of the anode catalytic layer is prolonged. Meanwhile, excellent electrochemical performance is ensured.

The invention belongs to the technical field of fuel cell membrane electrode preparation, and particularly discloses a preparation method for improving fuel cell catalyst layer ionomer distribution, which comprises the following steps: placing a carbon nanotube in dilute nitric acid, carrying out uniform ultrasonic dispersion, then carrying out oil bath heating, carrying out continuous acidification treatment, then carrying out suction filtration, and drying to obtain a carbon nanotube catalyst layer; carbon nano tube powder subjected to acidizing treatment is obtained; mixing the acidized carbon nanotube powder with a Nafion solution in proportion, and removing a solvent through rotary evaporation to obtain a carbon nanotube-Nafion compound; mixing the carbon nanotube-Nafion compound with a commercial Pt / C catalyst, deionized water and ethanol in proportion, and performing ultrasonic treatment under an ice bath condition to obtain uniformly dispersed cathode catalyst slurry; and spraying the uniformly dispersed cathode catalyst slurry on the cathode side of the proton exchange membrane to obtain the catalyst layer for improving ionomer distribution.

The application discloses a PEM water electrolysis hydrogen production membrane electrode and a preparation method thereof, and relates to the technical field of water electrolysis hydrogen production. The PEM water electrolysis hydrogen production membrane electrode comprises a proton exchange membrane and cathode and anode catalyst layers located on both sides of the proton exchange membrane, wherein the cathode catalyst layer and the anode catalyst layer both comprise a catalyst, a perfluorosulfonic acid ionomer, a solvent and a perfluorosulfonic acid ionomer dispersion promoter; and the perfluorosulfonic acid ionomer dispersion promoter is at least one of dimethyl sulfoxide, tetrahydrofuran and N-methyl pyrrolidone. The PEM hydrogen production membrane electrode catalyst layer prepared by the application has the dispersion promoter of the ionomer added, the dispersion degree of the ionomer in the catalyst layer is increased, a good catalyst / ionomer microporous structure catalyst layer is constructed, the transmission resistance of the gas and water is reduced, and the performance of the membrane electrode is improved. The preparation method adopted by the application does not need special treatment process and equipment, is simple and fast in operation, and is easy to realize batch production.

The invention discloses a preparation method and application of a boron nitride confined platinum single atom-platinum cluster double-site catalyst. The preparation method comprises the following steps: mixing urea, boric acid and carbon nanotubes, and grinding; the ground mixture is placed in an ammonia-argon mixed atmosphere environment for first pyrolysis, and powder is obtained; adding the powder into a boric acid solution, heating and stirring to obtain a defect-rich boron nitride carrier; and washing and drying the carrier, immersing the carrier in a platinum salt aqueous solution, carrying out ultrasonic dispersion, carrying out a vacuum freeze drying method, and finally carrying out second pyrolysis on the dried sample in an ammonia-argon mixed atmosphere to obtain the platinum single atom-platinum cluster composite structure (PtSA-C (at) eBN-CNT) material. The material can efficiently and synergistically catalyze an electrochemical hydrogen evolution reaction (HER) under an alkaline condition (1M KOH), can be applied to a membrane electrode electrochemical cell as a cathode catalyst, shows excellent catalytic activity and stability under working conditions, and has good industrial application potential.

The invention discloses a mercaptan-coated proton exchange membrane fuel cell cathode catalyst slurry, a preparation method and a membrane electrode, and the method comprises the following steps: step 1, dispersing carbon black in a water-alcohol solution and a surfactant to obtain a carbon black solution; 2, respectively preparing a platinum precursor solution and a cobalt precursor solution; 3, mixing the carbon black solution, the platinum precursor solution and the cobalt precursor solution, removing the solvent, and performing thermal reduction in reducing gas to obtain a binary ordered alloy catalyst; the temperature of the thermal reduction ranges from 700 DEG C to 1000 DEG C, and the time ranges from 0.5 h to 2 h. Step 4, dissolving the mercaptan powder in a mixed solvent of deionized water and isopropanol according to a ratio of 1: 1 to prepare a 1wt% mercaptan-containing solution; then, cooling the solution to 5 DEG C until solid substances are completely dissolved; and step 5, fully mixing the catalyst with the prepared mercaptan solution. And step 6, removing excessive mercaptan, and centrifuging the solution at the rotating speed of 10000 revolutions per minute for 10 minutes. And drying the precipitate in a vacuum drying oven for 12 hours to obtain the catalyst. The mercaptan-coated binary alloy catalyst prepared by the method can avoid poisoning effect of sulfonate radicals on Pt, improves expression of catalyst activity, and is helpful for improving performance of a fuel cell.

The invention provides a quantitative detection method for the average pressure of hydrogen in a PEM electrolyzed water cathode catalyst layer, and relates to the technical field of hydrogen production by electrolyzed water. The quantitative detection method comprises the following steps: carrying out a hydrolysis reaction in a PEM electrolytic cell, and calculating a hydrogen permeation flux N1 and a corresponding back pressure P1 under an electrolysis working condition; in another PEM electrolytic cell with the same structure, hydrogen is introduced into the cathode side, back pressure is applied to a cathode opening, meanwhile, inert gas is introduced into the anode side, an anode product channel is continuously purged, and the hydrogen permeation flux N2 under the hydrogen introduction working condition is calculated; gradually adjusting the back pressure under the hydrogen feeding working condition, repeating the step of testing the permeation flux under the hydrogen feeding working condition to obtain the hydrogen permeation flux under different back pressures, and drawing an N2-P2 curve; and determining a corresponding hydrogen back pressure value P2 when N1 is equal to N2, and calculating according to a formula deltaP = P2-P1 to obtain the average hydrogen pressure deltaP.

The application discloses a preparation method of Fe single-atom and Cu cluster co-doped nitrogen-carbon material and application of the material in full-pH oxygen reduction electrocatalysis. The ZIF-8 with a three-dimensional and rich pore structure is used as a framework, and Fe@ZIF-8 is prepared by using a solvothermal method. Then, copper acetylacetonate is used as a copper source, and the copper acetylacetonate molecules dispersed in the gas phase are adsorbed on the surface of the ZIF-8 by using the rich pore structure of the ZIF-8 and the low sublimation temperature of the metal acetylacetonate salt. Finally, pyrolysis is carried out under nitrogen or inert atmosphere, so as to form the Fe single-atom and Cu cluster co-doped nitrogen-carbon material. The material is subjected to electrochemical test under acidic, neutral and alkaline conditions, and the material exhibits high oxygen reduction electrocatalysis performance in the full-pH range and has good stability. The material has good performance as a cathode catalyst in a fuel cell, an alkaline / neutral zinc-air battery, and has high application value.

The invention discloses an AEM electrolytic cell membrane electrode and a preparation method and application thereof, the membrane electrode comprises: an anode comprising an anode catalyst growing on a porous metal substrate in situ; the cathode comprises a cathode catalyst and a cathode diffusion layer; the anion exchange membrane is arranged between the anode catalyst and the cathode catalyst; and the cathode catalyst is loaded on the cathode side of the anion exchange membrane. The self-supporting anode is formed in an in-situ growth mode, so that the self-supporting anode has the effects of being stable in performance, good in conductivity, not prone to falling off and the like, gas diffusion is guaranteed, active sites are provided for oxidation reaction, a gas diffusion layer does not need to be considered for the anode when an electrolytic cell is assembled, and assembling is easy and convenient; the cathode catalyst is sprayed on the anion exchange membrane, and the advantages of the CCM are combined, so that the mass transfer path of the cathode is reduced, the ohmic polarization is reduced, and the electrolytic efficiency is improved.

The invention belongs to the technical field of electrocatalytic carbon dioxide reduction, and particularly relates to a green and high-activity method for preparing formate through electrocatalytic carbon dioxide reduction. Comprising the following steps: loading a cathode catalyst on cathode carbon paper to obtain a catalytic cathode; loading an anode catalyst on the anode titanium felt to obtain a catalytic anode; constructing a flowing electrolytic tank by utilizing the catalytic cathode and the catalytic anode; carbon dioxide gas is introduced into the gas flow channel, so that the carbon dioxide gas is diffused to the catalytic cathode; an alkaline electrolyte is introduced into the liquid flow channel, so that the alkaline electrolyte flows through the catalytic anode; and voltage is applied to the flowing electrolytic tank for an electrolytic reaction, a product of the catalytic anode is collected, and formate is obtained after concentration and distillation. The method disclosed by the invention can be operated for a long time under the current density of 500-600mA / cm < 2 >, and the formate content in the formate solution can reach about 13%.

The application provides a Sn-doped Fe-N-C catalyst, a preparation method and application thereof. The catalyst comprises a carrier and Sn atoms and Fe atoms supported on the carrier, and the carrier is an N-doped carbon material. The application dopes the p-block metal Sn with stronger electronegativity into the Fe-N-C catalyst, forms an electron-withdrawing environment around the FeN4 site, reduces the electronegativity of the FeN4 site, and weakens the adsorption strength of the FeN4 site on the oxygen reduction intermediate. Meanwhile, the metal Sn is weaker in reactivity with hydrogen peroxide produced by the reaction of oxygen via a two-electron process than Fe, reduces the concentration of free radicals produced by the reaction, improves the stability of the carrier and active sites, and can effectively prevent the shedding of Fe. The application uses the catalyst as a cathode catalyst of a proton exchange membrane fuel cell, is low in cost, and can simultaneously meet the requirements of high catalytic activity and good stability.

The present invention discloses a catalytic layer for a fuel cell and a preparation method thereof. The catalytic layer comprises an anode catalyst and a cathode catalyst. The anode catalytic layer comprises: a Pt-C catalyst, a high-dielectric small-molecule alcohol, sulfonated lignin-doped conductive polymer nanoparticles, a hydrophilic adhesive, an ionomer solution, and deionized water; the cathode catalytic layer comprises a catalyst, an ionomer solution, a high-dielectric small-molecule alcohol, polytetrafluoroethylene, and deionized water. The present invention can solve the technical problems of poor water management effect and poor conductivity of the water management materials used in current fuel cell catalytic layers. The preparation method is simple and convenient, greatly reducing the difficulty of preparation and the difficulty of operation for operators.