269 results about "Oxygen reduction reaction" patented technology

The invention belongs to the technical field of chemical catalysis, and particularly relates to a preparation method of an alkali metal cation modified cobalt-nitrogen-carbon monatomic catalyst and application of the catalyst in electrosynthesis of hydrogen peroxide. The Co-N-C / X catalyst is obtained by taking a cobalt-containing compound as a metal source, mixing the metal source with a nitrogen-containing organic matter and a carbon material, performing rotary evaporation, grinding and high-temperature pyrolysis in an inert atmosphere, performing acid washing with strong acid to construct surface defects, and finally performing stirring adsorption with an alkali metal salt solution, suction filtration and drying. Alkali metal cations are physically adsorbed and anchored on the surface and interface of the Co-N-C catalyst instead of being dissolved in a solution, so that the electronic structure of Co active sites and the adsorption energy of the * OOH intermediate are optimized, and the problem of separation of alkali metal and a product is solved. When the catalyst is used for electro-catalytic oxygen reduction reaction, the H2O2 selectivity reaches up to 98%, the preparation process is simple, the cost is low, large-scale production can be realized, and the problems that the traditional method is high in energy consumption and large in pollution and the existing catalyst is insufficient in selectivity are solved.

The invention belongs to the technical field of catalysts, and discloses a rare earth platinum alloy catalyst and a preparation method and application thereof. The catalyst comprises a nitrogen-doped carbon carrier, and a PtGd alloy and a Ni elementary substance are loaded on the nitrogen-doped carbon carrier. The preparation method comprises the following steps: (1) preparing a Gd-ZIF material; and (2) uniformly mixing the Gd-ZIF, the platinum source solution and the nickel source solution, carrying out vacuum drying treatment, heating to 700-1000 DEG C in a reducing atmosphere, keeping the temperature for 1-2 hours, and cooling to room temperature to obtain the rare earth platinum alloy catalyst. The invention discloses application of a rare earth platinum alloy catalyst which is used as a cathode oxygen reduction reaction catalyst of a hydrogen fuel cell. The preparation method disclosed by the invention is simple to operate and can be used for large-scale preparation; the Pt content of the rare earth platinum alloy catalyst prepared by the method is reduced to 13%, and the cost of raw materials is directly and greatly reduced; the maximum half-wave potential of the rare earth platinum alloy catalyst can reach 0.93 V vs.RHE which is far higher than that of commercial Pt / C.

The invention relates to a platinum-zinc alloy supported nitrogen-doped porous multi-layer carbon material and preparation and application thereof, the carbon material takes a rod-like graded porous carbon nanomaterial as a carrier, and platinum-zinc alloy particles and zinc monatomic are jointly supported on the surface of the carrier; the preparation method comprises the following steps: S1, adding zinc acetate and hexadecyl trimethyl ammonium bromide into DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding into a polyacrylonitrile solution, and stirring; s2, performing electrostatic spinning on the obtained spinning precursor solution; s3, adding the obtained nanofiber into a zinc acetate dihydrate solution, then adding a dimethylimidazole solution, carrying out hydrothermal reaction, soaking the obtained product in a chloroplatinic acid methanol solution, and then carrying out freeze drying; and S4, heating carbonization is carried out under the protection of an inert atmosphere, then annealing and cooling are carried out, and the PtZn-Zn-N4-HPCNFs material is obtained. Compared with the prior art, the catalytic performance and the like in the reaction processes of oxygen reduction reaction (ORR), chlorine evolution reaction (CER) and the like can be effectively improved.

The invention discloses a preparation method and application of a high-density iron-nitrogen-carbon monatomic catalyst. The method specifically comprises the following steps: S1, uniformly mixing nitrogen-doped carbon and ferrous oxalate; s2, in an inert atmosphere, carrying out a first pyrolytic reaction at 340-360 DEG C to obtain an intermediate, and meanwhile, carrying out etching on the carbon carrier by using CO2 gas generated by the reaction, so that a plurality of microporous structures are formed on the carbon carrier; s3, the intermediate continues to be subjected to a second pyrolytic reaction in the inert atmosphere at the temperature of 850-950 DEG C, the FeOx nano-particles are converted into Fe-N4 active sites, and a pyrolytic product is obtained; and S4, naturally cooling to room temperature to obtain the high-density iron-nitrogen-carbon monatomic catalyst. Superfine ferric oxide (FeOx) nano-particles are generated through a precursor to serve as intermediates, carbon defects are created through CO2 gas released in the decomposition process of the FeOx nano-particles, and therefore the oxygen reduction reaction performance of the catalyst is remarkably improved, and the catalyst is applied to fuel cells.

The invention discloses a porous carbon catalyst embedded with high-density alloy nanoparticles as well as a preparation method and application of the porous carbon catalyst, and belongs to the technical field of fuel cells or water electrolysis catalytic materials. The porous carbon catalyst embedded with the high-density alloy nanoparticles is a nitrogen and oxygen co-doped carbon carrier which has a porous structure and is partially graphitized, the high-density and high-crystallinity alloy nanoparticles which are uniformly dispersed are embedded in the carbon carrier, and the particle size distribution is below 6nm. According to the porous carbon catalyst embedded with the high-density alloy nanoparticles, the dispersity and the utilization rate of the metal alloy nanoparticles are remarkably improved, and meanwhile, the conductivity and the stability of a carbon carrier are improved, so that the catalytic activity of the carbon carrier in an oxygen reduction reaction and an oxygen evolution reaction in an alkaline medium is effectively enhanced; the catalyst has very excellent bifunctional oxygen catalysis performance, and has a wide application prospect in the field of renewable energy source conversion and storage.

The invention discloses a Joule thermal preparation method of a carbon-supported high-entropy sulfide catalyst and application of the carbon-supported high-entropy sulfide catalyst in a zinc-air battery. A metal chlorine salt solution is used as a metal precursor, and sulfur is used as a sulfur source. Sulfur, carbon powder and a metal chlorine salt solution are uniformly mixed and loaded on a conductive carrier, and Joule heat treatment is carried out. Instantaneous high temperature acts on a carbon-supported metal precursor, the metal precursor is decomposed, S8 is decomposed into high-activity S2 gas, diffusion of sulfur atoms is accelerated at high temperature, combination of S2 and reduced metal atoms is promoted, sulfide bonds are formed, meanwhile, segregation is inhibited through rapid cooling, and finally the uniform single-phase carbon-supported high-entropy sulfide catalyst is formed. The uniformly distributed carbon-loaded high-entropy sulfide catalyst is prepared by Joule thermal pyrolysis, the preparation method is simple, energy-saving and environment-friendly, and the catalyst can simultaneously catalyze an oxygen reduction reaction and an oxygen evolution reaction, is used as a bifunctional catalyst for a zinc-air battery, has excellent catalytic activity and stability, and is easy to popularize and use.

This invention discloses a method for preparing a noble metal electrocatalyst supported on a non-noble metal material and its application. The preparation method includes: Step 1, dissolving a non-noble metal precursor and a noble metal precursor in a mixed solvent; Step 2, adding a carbon support and ultrasonically dispersing until homogeneous; Step 3, rotary evaporation to obtain a solid phase; Step 4, treating the solid phase with NH3 gas and then with Ar gas; Step 5, ultrasonically dispersing the treated solid phase in a sulfuric acid aqueous solution and refluxing to obtain a refluxed solid phase; Step 6, washing the refluxed solid phase with water until the pH of the filtrate is neutral, and drying the washed solid phase to obtain the noble metal electrocatalyst supported on a non-noble metal material. In electrochemical tests conducted in an HClO4 aqueous solution, this noble metal electrocatalyst supported on a non-noble metal material exhibits a half-wave potential above 0.875 V vs. RHE and a specific activity above 310 mA / mg. Pt It exhibits significantly enhanced catalytic activity for oxygen reduction reactions.

The preparation method mainly comprises the following steps: dissolving chloroplatinic acid, lanthanum salt and manganese salt in water according to a certain proportion, adding a complexing agent, adjusting the pH value, and carrying out gelation, drying and high-temperature calcination to obtain a perovskite precursor; and treating in a reducing atmosphere, so that platinum atoms are selectively dissolved out from crystal lattices, high-dispersion platinum nanoparticles are formed on the surface, and finally, the composite catalyst with extremely low platinum loading capacity is obtained. According to the method, platinum species are stably anchored through the perovskite carrier, the platinum atom utilization rate and catalytic stability are remarkably improved, excellent electrocatalytic activity and durability are shown in the oxygen reduction reaction, and the method can be widely applied to energy conversion equipment such as zinc-air cells and fuel cells and has important practical application value.

The application provides a preparation method of a nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst. The method comprises the following steps: (1) stirring and mixing a nitrogen-doped carbon carrier with an alcohol solvent to obtain a uniformly dispersed system A; (2) uniformly mixing a metal precursor with an alcohol solution by ultrasonic mixing to obtain a uniformly dispersed system B; (3) uniformly stirring and mixing the system A and the system B, then performing oil bath heating, and then performing washing and drying to obtain a nitrogen-doped carbon-supported platinum-cobalt alloy; and (4) placing the product obtained in step (3) into a porcelain boat, annealing the product in an inert atmosphere at a high temperature, and cooling the product to room temperature to obtain the nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst. The nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst prepared by the method has a uniform particle distribution and exhibits good catalytic activity and stability in an oxygen reduction reaction (ORR) of a fuel cell.

This method maintains electronic conductivity and oxygen reduction reactions while suppressing the decrease in gas diffusion performance due to sintering. [Solution] An electrochemical element in which an electrode layer 2, an electrolyte layer 4, and a counter electrode layer 6 are stacked in the order described, and the air electrode or oxygen generating electrode, which is either the electrode layer 2 or the counter electrode layer 6, has an active layer 6a in which an oxidation-reduction reaction is carried out from the side of the electrolyte layer 4 and a diffusion layer 6b for diffusing gas, wherein the diffusion layer 6b is composed of a mixture of particulate LSCF and CoMn metal oxide, which is a metal oxide containing particulate Co and Mn.

The application provides a porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction and a preparation method. The preparation method comprises the following steps: adding 4,4-diamino diphenyl ether and pyromellitic dianhydride into a solvent, uniformly mixing, and preparing a polyamide acid precursor spinning solution; electrospinning the prepared polyamide acid precursor spinning solution to prepare polyamide acid nanofibers; immersing the prepared polyamide acid nanofibers in a mixed metal salt solution containing cobalt salt, lanthanum salt and zinc salt to prepare polyamide acid nanofiber precursors loaded with metal ions; and performing programmed temperature heat treatment on the prepared polyamide acid nanofiber precursors loaded with metal ions in a protective atmosphere to prepare the porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction. The prepared porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction has excellent electrochemical oxygen reduction reaction and oxygen evolution reaction bifunctional catalytic activity.

The invention discloses an electro-catalytic composite material with Ni-N-Co asymmetric adsorption sites as well as a preparation method and application thereof, and relates to the technical field of electro-catalytic oxygen reduction reaction. The preparation method comprises the following steps: dispersing a cobalt source, a nickel source and 2-methylimidazole in a solvent, stirring for 10-14 hours, and centrifuging to obtain a precursor; placing the precursor and a nitrogen source in an inert atmosphere, raising the temperature to 400-600 DEG C at a speed of 3-7 DEG C / min, preserving heat for 1-3 hours, raising the temperature to 800-1000 DEG C at a speed of 3-7 DEG C / min, and preserving heat for 1-3 hours to obtain an electro-catalytic composite material; wherein the molar ratio of the cobalt source to the nickel source to the 2-methylimidazole is 1: (0.01-0.15): (6-10); the mass ratio of the precursor to the nitrogen source is 1: (4-6). According to the method, Ni-N-Co asymmetric active sites are constructed by regulating and controlling precursor coordination and a pyrolysis process, so that accurate regulation and control of adsorption and desorption behaviors of the ORR intermediate are realized.

This invention discloses a method for preparing a cathode catalyst and positive electrode sheet for a neutral zinc-air battery, relating to the field of zinc-air batteries. The catalyst material is M-N-C (M being a transition metal). Nitrogen is dissociated by discharge in a nitrogen atmosphere using a plasma ball mill. Metal particles detach from the metal spheres composed of M under high-speed impact and are directly loaded onto a highly dispersed carbon substrate through electric field adsorption. The resulting mixture is then subjected to high-temperature heat treatment in a tube furnace under inert gas protection to obtain the target M-N-C catalyst material. When used as the cathode catalyst layer of a neutral zinc-air battery, the M-N-C catalyst material provided by this invention can effectively improve the reaction efficiency of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), reduce the overpotential of the zinc-air battery, improve the cycle stability of the neutral zinc-air battery, and increase its cycle life.

A method of enhancing efficiency of an oxygen evolution reaction (OER), oxygen reduction reaction (ORR), or hydrogen evolution reaction (HER) comprises increasing total number electron pathway and / or reaction kinetics of the OER, ORR, or HER by coating one or more surfaces of an electrode participating in the OER, ORR, or HER with one or more metal oxides.

The present invention relates to composite particles of a core-shell structure including a metal oxide particle core and a platinum-group transition metal shell, and an electrode for platinum-group transition metal-based electrochemical reactions including an oxygen reduction reaction, the electrode including the composite particles. Specifically, the present invention relates to: composite particles of a core-shell structure including a platinum-group transition metal shell formed on a metal oxide particle core by a photoreduction reaction; a catalyst for platinum-group transition metal-based electrochemical reactions including an oxygen reduction reaction, the catalyst including the composite particles; an electrode for platinum-group transition metal-based electrochemical reactions including an oxygen reduction reaction; a fuel cell; and a platinum-group transition metal-based electrochemical conversion device.

A high-load cobalt-based single-atom catalyst for oxygen reduction and its preparation method are disclosed, belonging to the field of electrocatalysis technology. This method utilizes the cage structure in ZnCo-ZIF to encapsulate nitrogen-rich metal molecules, followed by high-temperature carbonization under nitrogen conditions to obtain the catalyst. Benefiting from the separating effect of Zn metal nodes in ZIF and the spatial confinement effect of the ZIF cages, as well as the high nitrogen content in the guest molecule, a cobalt-based single-atom catalyst with a loading of 4.0 wt% was prepared. Furthermore, compared to traditional preparation methods, the catalyst prepared using a mixed solvent exhibits a small particle size, resulting in a high specific surface area that fully exposes the active sites. The large specific surface area allows for the full exposure of the high-load metal atom active sites, thus demonstrating excellent performance in the oxygen reduction reaction, with a half-wave potential of 0.88 V and a limiting current density of 6.0 mA·cm⁻¹ in 0.1 M KOH electrolyte. ‑2 .

The invention discloses an electro-catalysis method for synchronously and efficiently producing ClO2 and H2O2, and belongs to the technical field of chemistry and environment, a carbon fiber felt is used as an anode, graphite sheet loaded nano Fe3O4-coated three-dimensional porous graphene is used as a cathode, a potentiostatic method is adopted in a double-chamber electrolytic bath, the anode electrolyzes chlorite to generate ClO2, the cathode generates H2O2 through a 2e-oxygen reduction reaction, and the H2O2 and the carbon fiber felt are subjected to electrocatalysis. The cathode chamber and the anode chamber are separated through a cation exchange membrane, and the electrolyte contains sodium sulfate and chlorite. All the used raw materials are low in price and environmentally friendly, synchronous preparation of ClO2 and H2O2 is achieved, and the problems that an existing electrolysis process electrode is high in cost and single in function are solved.

The present application belongs to the technical field of fuel cell electrocatalysts, and particularly relates to a bromine-modified iron-nitrogen-carbon oxygen reduction electrocatalyst with high iron loading and atomic dispersion, and a preparation method and application thereof. The electrocatalyst is a porous carbon-based material, and contains carbon, nitrogen, bromine and iron elements, wherein the iron is anchored in the nitrogen-doped carbon substrate in the form of atomic dispersion. The preparation method comprises the following steps: dissolving a Fe-based metal macrocycle compound in an organic solvent, mixing the organic solvent with an aqueous solution containing 2-methyl imidazole and a Br-containing precursor, and adding an aqueous solution containing a zinc salt and a surfactant for co-assembly to obtain a precursor; and pyrolyzing the precursor to obtain a bromine-modified Fe-N-C electrocatalyst. Compared with the Fe-N-C electrocatalyst without bromine modification, the electrocatalyst can effectively regulate the local coordination environment of iron sites, and has the advantages of atomic dispersion, high iron loading and excellent oxygen reduction reaction activity, and can be used in fuel cells and related electrochemical energy conversion devices.

The present application belongs to the technical field of water treatment, and discloses a water treatment method and system adopting unidirectional pulse high-voltage electric field discharge oxidation, alternating current electric field fixed spiral wing fin static disturbance electric field microflocculation, conventional magnetic field separation, and anaerobic reduction reaction. A pressurizing water pump is installed in series at the outlet of a water source, and the treated water enters the unidirectional pulse high-voltage electric field discharge oxidation device, the alternating current electric field fixed spiral wing fin static disturbance microflocculation device, and the magnetic separation device in sequence through pressurization, and then enters the conical bottom anaerobic reduction reaction water tank, and is supplied to the user after pressurization by the outlet pressurizing pump; when the magnetic separation device is saturated, the backwashing process is started, the backwashing adopts steam-water backwashing, the backwashing sewage enters the conical bottom anaerobic reduction reaction water tank, a backflow submersible metering pump is arranged at the upper half of the water tank, the outlet of the metering pump is connected to the water inlet of the unidirectional pulse high-voltage electric field discharge oxidation device and is provided with an electromagnetic valve, and is used for strengthening the oxidation microflocculation again, thereby saving the cost of the traditional process by 50-80%.

This invention discloses a method for preparing nitrogen-containing conjugated macrocyclic molecules and their composite catalysts, as well as their applications. The method involves adding small-molecule conjugated amines and conjugated anhydride ligands to a polar solvent to obtain a solution containing the ligands and the polar solvent. The precursor solution is then transferred to a reaction apparatus consisting of a flask and a condenser, where the ligands are fully dissolved by magnetic stirring. A highly conductive support and a metal source are then added to the precursor solution, and the precursor is heated to undergo a solvothermal reaction. Simultaneously, an acid is added as a catalyst to initiate a cyclization reaction. After the reaction, a preliminary product is obtained by filtration and vacuum drying. This preliminary product is then redispersed in a polar solvent and subjected to multiple centrifugal washings to remove unreacted small-molecule conjugated amines and conjugated anhydride ligands. After further filtration and vacuum drying, the nitrogen-containing conjugated macrocyclic molecule composite catalyst is obtained. This invention, through the rational design of nitrogen-containing conjugated macrocyclic molecules composed of small-molecule conjugated amines and conjugated anhydride ligands, and their combination with highly conductive supports and metal sources, significantly enhances the conductivity and interfacial charge transport capacity of catalysts, reduces overpotential and reaction energy barriers during catalytic reactions, and expands their application range in electrocatalytic and photocatalytic reactions. It can be used for oxygen reduction reactions, oxygen evolution reactions, hydrogen evolution reactions, carbon dioxide reduction reactions, nitrogen reduction reactions, nitrate reduction reactions, urea synthesis reactions, and oxidation or reduction reactions of small organic molecules.

The invention discloses a preparation method and application of a cubic phase hafnium carbide nano-material, and relates to the technical field of rapid preparation of electrocatalytic nano-materials, the cubic phase hafnium carbide nano-material is prepared by adopting a rapid high-temperature thermal shock Joule thermal synthesis method, and the defects of high temperature requirement and long annealing time of a traditional annealing method are overcome; hafnium carbide in the cubic phase nanometer material is in a nanometer particle shape, and the crystal structure is a cubic phase; the hafnium carbide nano material has good alkaline oxygen reduction reaction catalytic performance, and can be used as a cathode material of a zinc-air battery and a fuel cell.

The application discloses application of an imine compound as a photocatalyst in photocatalytic production of hydrogen peroxide. The imine compound is used as a photocatalyst for oxygen reduction reaction under irradiation to produce hydrogen peroxide. The system used is a two-phase system composed of water and an organic solvent, the photocatalyst exists in the organic phase, the generated hydrogen peroxide is extracted in situ into the water phase, and the organic solvent in the organic phase is oxidized to generate a high-value-added product. The photocatalytic reaction system of this type has excellent characteristics such as simple preparation, low cost, mild reaction conditions, high stability, fast reaction rate and the like, and has a wide application prospect.

The invention relates to a carbon-loaded platinum-based ternary alloy catalyst and preparation and application thereof, the preparation method of the catalyst comprises the following steps: S1, dispersing a carbon carrier, a platinum-containing compound solution and a soluble metal salt solution of cobalt and nickel into ethylene glycol to obtain a ternary precursor suspension; and S2, adding a precipitator into the ternary precursor suspension, stirring, reacting in a microwave reactor, separating a product, washing and drying to obtain the carbon-loaded platinum-based ternary alloy catalyst. The preparation method has the characteristics of rapidness, simplicity and convenience, and is convenient for batch production; meanwhile, under the microwave reaction condition, Ni is used for promoting the activity of the Pt catalyst, Co and Ni are used for cooperatively regulating and controlling the particle size and dispersity of the catalyst, and the efficient synergistic effect of ternary metal under the microwave effect is achieved. The prepared PtCoNi ternary alloy catalyst is lower in noble metal content, moderate in particle size, uniform in dispersion, high in catalytic activity, good in stability and suitable for oxygen reduction reaction of fuel cells.

The invention discloses an oxygen reduction catalyst based on Nb-oxygen fluorine cluster confinement and pulse induction ordering as well as a preparation method and application of the oxygen reduction catalyst. The preparation method of the platinum-based multi-component alloy catalyst comprises the following steps: S1, adding ammonium niobate fluoride and hydrogen peroxide into a dispersion liquid containing a carbon carrier for reaction so as to introduce Nb-oxygen fluorine clusters on the surface of the carbon carrier in situ; s2, a platinum source, a cobalt source and a nickel source are added into a product obtained in the step S1, then ascorbic acid and sodium borohydride are added for a reaction, and Pt-Co-Ni alloy particles in the Nb-oxygen fluorine cluster confinement range are obtained; and S3, carrying out pulse Joule heating treatment on the product obtained in the step S2 so as to convert the alloy from a disordered structure into an ordered L12 phase, thereby obtaining the platinum-based multi-component alloy catalyst. The catalyst disclosed by the invention shows excellent oxygen reduction reaction activity and long-term stability when applied to the cathode of the proton exchange membrane fuel cell.

The invention discloses a composite electrocatalyst based on polyurethane foam, a preparation method and a battery. The composite electrocatalyst is nitrogen and sulfur co-doped carbon foam loaded with cobalt hydroxide nanosheets and CoP, and the specific surface area of the carbon foam is 186-211m < 2 > / g; the carbon foam is obtained by calcining a polyurethane foam-based transition metal composite material in an inert atmosphere at the temperature of 700-750 DEG C. According to the present invention, the cobalt hydroxide nanosheet and the cobalt phosphide are loaded so as to provide the rich self-supporting pore structure, such that the specific surface area of the electrocatalyst can be easily increased, and the cobalt hydroxide nanosheet and the cobalt phosphide are loaded so as to provide the rich adsorption site for the oxygen. Through co-doping of nitrogen and sulfur, the active sites of the electrocatalyst are further increased, and the kinetic efficiency of oxygen reduction reaction is improved. Moreover, in the oxygen reduction reaction process, the composite electrocatalyst is not prone to agglomeration, active substance falling and other problems, and therefore the circulation capacity of the oxygen reduction reaction can be improved.

The application belongs to the technical field of fuel cell application, and discloses a polynorbornene-based anion exchange ionomer with double-domain coupled ion channels, a preparation method and application thereof. The polynorbornene-based anion exchange ionomer simultaneously constructs an ion domain rich in cation groups and a synergistic functional domain rich in oxygen-containing functional groups at a molecular scale, the two types of domains are coupled with each other in the material and form a continuous double-domain ion transmission network, so that the ionomer can still maintain a stable and continuous hydrogen and oxygen ion transmission channel under the conditions of a thin layer state of a cathode catalyst layer and limited hydration, and effectively improves the ion transmission connectivity and catalyst utilization efficiency of the catalyst layer interface. The ionomer is suitable for being used as an ion-conducting bonding material of a cathode of an alkaline membrane fuel cell, can improve the oxygen reduction reaction performance of the cathode, and provides a new material and structural design idea for a low-noble metal loading and high-power density fuel cell electrode structure design.

The invention relates to a high-durability fuel cell platinum-based catalyst and a preparation method thereof, the fuel cell platinum-based catalyst comprises a platinum-based catalyst and a metal oxide, and the metal oxide covers a part of the surface of the platinum-based catalyst; the metal oxide comprises an indium element. An indium oxide or an indium-containing composite oxide is modified on the surface of the platinum-based catalyst, and the oxide can be stably combined on the surface of the platinum-based catalyst to form epitaxial growth and form an interface site with the platinum catalyst, so that the fuel cell catalytic activity of the platinum catalyst can be promoted. Meanwhile, by controlling the reasonable coverage degree of the metal oxide on the surface of the platinum-based catalyst, the number of active sites exposed by the platinum catalyst is reserved, and the catalytic performance of the oxygen reduction reaction of the cathode of the fuel cell is improved to the maximum extent.

The application discloses a kind of catalyst and its preparation method and application, preparation method includes the following steps: (1) soluble metal precursor salt is dissolved in water, then cation resin is added to be adsorbed, after adsorption is completed, it is washed, dried, grinded;(2) the obtained material of step (1) is directly heat-treated in air, heat treatment temperature is 350-650 DEG C, heat treatment time is 4h-12h, then the heat treatment product is washed by acid, washed by water, dried, grinded, and is prepared.The catalyst prepared by the preparation method is a monometallic or multi-metal oxide, with a particle size of 1-20 nm, has a porous structure, can realize low-temperature synthesis of multi-metal oxide during preparation, and is uniformly distributed.The metal oxide can be used as an anode oxygen evolution reaction catalyst for water electrolysis, a cathode oxygen reduction reaction catalyst carrier for fuel cells and an anode anti-reverse catalyst for fuel cells, with high activity and high stability.

The application discloses a rare earth composite oxide material and a preparation method and application thereof, and belongs to the technical field of cathode material preparation. x M 3‑ x N2O 7‑δ , wherein R is one or more of La, Pr, Nd, Sm, Eu, Gd and Y elements; M is one or more of Ba, Sr and Ca elements; N is one or more of Co, Fe, Ni, Mn and Cu elements, and 0.5<=x<=3. The rare earth composite oxide material has good structural stability and electrical conductivity, and is used as a cathode material of a solid oxide fuel cell and has excellent oxygen reduction reaction catalytic activity in a medium-low temperature range.