399 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 present invention generally relates to a process for synthesizing a graphene oxide quantum dots-iron phthalocyanine (FePc-GOQDs) nanocomposite with enhanced electrochemical properties, particularly for oxygen reduction reactions (ORR). The process begins by dispersing 500 mg of graphene oxide (GO) in a hydrogen peroxide and deionized water solution in a 1:10 volume ratio, followed by hydrothermal treatment at 180° C. for 8 hours to produce GO quantum dots (GOQDs). The resulting material is freeze-dried to obtain GOQDs powder. Subsequently, 60 mg of GOQDs are combined with 10 mg of iron phthalocyanine (FePc) and 20 mL of dimethyl sulfoxide (DMSO), and the mixture is subjected to microwave irradiation at 500 W and 150° C. for 30 minutes. The resulting composite is rinsed repeatedly with deionized water and ethanol, then dried at 120° C. to yield the FePc-GOQDs nanocomposite. This composite demonstrates superior ORR performance due to strong Fe—O bonding and optimized electronic interactions.

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 the technical field of preparation of binuclear cobalt complexes, in particular to a binuclear cobalt complex as well as a preparation method and application thereof. The molecular formula of the binuclear cobalt complex is Co2 (L1) 2X2, the binuclear cobalt complex is composed of two L12-groups, two trivalent cobalt and two X-ions, and X is Cl or OH. The binuclear cobalt complex Co2 (L1) 2Cl2 belongs to a triclinic system, belongs to a P-1 space group, and is a chlorine-bridged binuclear cobalt complex. The binuclear cobalt complex Co2 (L1) 2 (OH) 2 belongs to a monoclinic system, belongs to a P21 / n space group, and is an oxyhydrogen bridging binuclear cobalt complex. The preparation method of the two binuclear cobalt complexes is simple, the cost is lower than that of precious metal, the stability and the selectivity are good, and the binuclear cobalt complexes have certain electrocatalytic oxygen reduction reaction performance.

A technology for preparing glutaraldehyde through cyclopentene oxidation belongs to the technical field of organic synthesis, glutaraldehyde is prepared through cyclopentene oxidation by adopting a photocatalysis-electrocatalysis synergistic catalyst g-C3N4 / TiO2 (at) Au-Co / N-G. The catalyst is of a unique core-shell structure, is stable in property, promotes an oxygen reduction reaction in a catalysis technology, and has good catalytic activity. The conversion rate of cyclopentene and the selectivity of glutaraldehyde are remarkably improved, and the effect is remarkable.

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 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 discloses a hexagonal bismuth phosphate modified indium zinc sulfide (ZIS / HBIP) composite catalyst and a preparation method thereof. The catalyst is applied to photocatalytic synthesis of HO. The indium zinc sulfide (ZIS) nano flower balls in the catalyst are prepared by a hydrothermal method, and then hexagonal bismuth phosphate (HBIP) is loaded on the surface of the ZIS by a room temperature precipitation method to obtain a series of ZIS / HBIP composite catalysts. ZIS and HBIP can effectively improve photo-induced electron-hole separation and transmission, improve the selectivity of direct two-electron oxygen reduction reaction (2eORR) and inhibit HO decomposition. Experimental results show that when the theoretical dosage of HBIP is 0.01 mmol, the prepared ZIS / HBIP 0.01 has the optimal photocatalytic activity, the HO yield within 1 h can reach about 955 [mu] mol.g.h, and efficient synthesis of HO in pure water is achieved.

The invention discloses an electrode material for purifying and disinfecting drinking water as well as preparation and application thereof, and belongs to the technical field of drinking water purification. An Ag nano structure and an Au nano structure are sequentially constructed on a plastic base material, the electrode material is endowed with excellent antibacterial and catalytic performance, the Ag nano structure is formed through acid treatment and precursor solution soaking, and the preliminary antibacterial performance is endowed; the antibacterial effect is enhanced by micro-emulsion soaking; the microemulsion A and the solution B are mixed to prepare a spraying solution, a stable Au nanostructure is formed after spraying, an electrochemical oxygen reduction reaction is promoted, the H2O2 generation efficiency is improved, hydroxyethyl ethylenediamine triacetic acid and acrylamide are used in cooperation, the Au dosage and the complexing temperature are adjusted, a microcosmic honeycomb structure is formed, and the H2O2 concentration is remarkably improved. The electrode material has antibacterial performance, also has excellent conductivity and catalytic activity, is stable in purification effect before and after use, can be repeatedly used, and has wide application prospects in the fields of drinking water purification and the like.

According to the heteroatom-doped carbon nanohorn catalyst and the preparation method and application thereof, doping elements are accurately introduced into a carbon nanohorn framework in the preparation process of the catalyst, a stable heterostructure is formed, two-dimensional adsorption and activation of O2 molecules on the surface of an electrode are effectively enhanced, a two-electron reduction path is remarkably promoted, and the heteroatom-doped carbon nanohorn catalyst is prepared. The four-electron reduction side reaction is inhibited, the H2O2 selectivity and the oxygen reduction reaction (ORR) activity are enhanced, and the H2O2 yield and the Faraday efficiency are remarkably improved. Meanwhile, the heteroatom-doped carbon nanohorn catalyst has high electrochemical stability in a chloride ion-containing system, shows excellent stability and corrosion resistance under a natural seawater condition, and is suitable for long-time continuous operation.

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 relates to the technical field of intermetallic compound catalysts, and particularly discloses a preparation method of a hexagonal layered Pt-Bi intermetallic compound nanocrystalline catalyst, which comprises the following steps: weighing octadecene and oleylamine, and mixing to obtain a solution A; platinum acetylacetonate, bismuth acetate, ascorbic acid and hexadecyl trimethyl ammonium bromide are weighed and sequentially poured into the solution A, and a solution B is obtained through mixing and ultrasonic treatment; heating and preserving heat of the solution B, and naturally cooling to room temperature to obtain a turbid liquid C; and measuring cyclohexane and ethanol, sequentially pouring into the turbid liquid C, carrying out ultrasonic treatment at room temperature for 3 minutes, then pouring out supernate, repeating for 2-3 times, collecting a product, and drying to obtain the nanocrystalline catalyst. According to the invention, the electron interaction between bimetallic components is utilized, the electron structure of a catalytic active center is optimized, the interaction between the active structure and reaction active species is enhanced, the evolution kinetics of a plurality of reaction intermediates such as * O and * OOH in the electrocatalytic oxygen reduction reaction can be obviously accelerated, and the kinetics rate of the four-electron oxygen reduction reaction is improved.

The invention discloses a high-entropy spinel oxide loaded graphene catalyst, a preparation method thereof and a flexible zinc air battery, and belongs to the technical field of electrocatalysis. The high-entropy spinel oxide loaded graphene catalyst is a (FeCrCuNiMn) 3O4 / rGO composite material, the (FeCrCuNiMn) 3O4 is a high-entropy oxide with a spinel type structure, and the rGO is reduced graphene oxide. The catalyst shows excellent catalytic performance in oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), and has relatively high electrochemical activity, stability and conductivity. In a low-temperature environment, the flexible zinc-air battery driven by the catalyst can significantly reduce battery polarization in charging and discharging processes, the power density of the flexible zinc-air battery is improved, and the overall performance and low-temperature adaptability of the battery are effectively improved. And the requirements of high efficiency and low-temperature adaptability of the flexible zinc-air battery at low temperature are met.

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.

The invention relates to the field of inorganic functional materials, and particularly discloses a corrosion-resistant layered Pt-C catalyst and a preparation method and application thereof. The nitrogen-doped carbon carrier, the spinel oxide and the Pt nanoparticles are arranged to form a novel corrosion-resistant catalyst, and through the synergistic effect of the spinel oxide AB2O4 and the nitrogen-doped carbon carrier N-Carbon, the electron cloud density on the surface of the carbon carrier is effectively reduced, the carbon corrosion problem of traditional Pt / C under high potential is inhibited, and the carrier stability is remarkably improved; spinel oxide is used as an anchoring point of platinum nanoparticles, the migration energy barrier of the platinum nanoparticles is improved, the platinum utilization rate is improved through an in-situ precipitation process, the comprehensive cost is reduced compared with commercial Pt / C, and due to the fact that the production process is simple and the production period is short, the production cost is reduced. The catalyst shows excellent oxygen reduction reaction catalytic activity and stability in zinc-air cells and fuel cells, the preparation method is simple, special equipment is not needed, and the catalyst has good industrial amplification potential.

A catalytic structure can comprise a catalyst and one or more radical scavengers. Each radical scavenger can comprise one or more nanoparticles. Each nanoparticle can be formed as an oxide or oxynitride and can comprise at least one metal selected from titanium (Ti), zirconium (Zr), hafnium (Hf), rutherfordium (Rf), vanadium (V), niobium (Nb), tantalum (Ta), and dubnium (Db). In some embodiments, the radical scavenger can be used in an oxygen reduction reaction, for example, to decompose hydrogen peroxide into water and oxygen. In some embodiments, the catalytic structure with radical scavengers can exhibit enhanced durability, for example, when incorporated into a proton-exchange membrane (PEM) fuel cell.

The invention discloses a preparation method of a cerium-based compound catalyst for electrosynthesis of hydrogen peroxide through an oxygen reduction reaction. The method comprises the following steps: 1) dissolving cerium nitrate and urea in deionized water, and carrying out hydrothermal reaction and heat treatment to obtain cerium dioxide; 2) carrying out heat treatment on a certain amount of melamine to obtain graphite-phase carbon nitride; (3) adding the prepared cerium dioxide and graphite-phase carbon nitride into methanol and stirring; and finally, performing heat treatment on a sample in a muffle furnace to obtain the cerium dioxide composite graphite phase carbon nitride catalyst. The cerium-based compound catalyst prepared by the preparation method has excellent performance on a two-electron oxygen reduction reaction.

The invention relates to an iron single atom / zinc atom cluster-nitrogen-carbon composite material as well as a preparation method and application thereof. Zinc nitrate hexahydrate, ferric acetylacetonate and dimethylimidazole are used as raw materials, and the iron single atom / zinc atom cluster-nitrogen-carbon composite material FeSA / ZnAC-N-C is prepared through stirring and thermal shock at room temperature. The preparation method comprises the following steps: a, stirring at room temperature to prepare an iron-zinc bimetallic zeolite imidazole organic framework FeZn-ZIF precursor; and b, carrying out thermal shock on the precursor to prepare the FeSA / ZnAC-N-C. The FeSA / ZnAC-N-C shows excellent oxygen reduction reaction (ORR) catalytic performance, the half-wave potential is 0.90 V, the Tafel slope is 46.4 mV dec-1, and the performance exceeds that of commercial Pt / C. Besides, the zinc-air battery constructed by taking FeSA / ZnAC-N-C as the air cathode can reach the maximum power density of 161.5 mW cm <-2 > and the specific discharge capacity of 792.7 mAh g <-1 >, can stably circulate for 1500 circles, and shows good practical application value. The preparation method can be expanded to preparation of other monatomic / atomic cluster composite materials, and a new idea is provided for development of efficient electrocatalysts.

The invention relates to a method for preparing hydrogen peroxide by electrocatalytic oxygen reduction and preparing carboxylic acid by coupling ketone oxidation, belongs to the technical field of electrocatalysis, and solves the problems of relatively high energy consumption and / or relatively low economic value of an anode product in the existing method for preparing hydrogen peroxide by electrocatalytic oxygen reduction. The method comprises the following steps: taking a carbon catalyst electrode as a cathode, wherein catholyte comprises a sodium sulfate solution; a NiCo2O4 electrode is used as an anode, and an anolyte is a solution containing potassium hydroxide and ketone; the catholyte and the anolyte are separated by a proton exchange membrane; the cathode is subjected to an electrocatalytic oxygen reduction reaction to generate hydrogen peroxide, and the anode is subjected to an electrocatalytic ketone oxidation reaction to generate carboxylic acid. The COR reaction is used for replacing the oxygen evolution reaction (OER) of the anode in the prior art, so that energy consumption is reduced, the anode converts ketone into carboxylic acid with high added value, and the economic value of the anode product is improved.

[Problem] To provide a method for producing an oxygen reduction reaction catalyst having relatively superior characteristics not only under alkaline conditions but also under neutral and acidic conditions, and to provide an oxygen reduction reaction catalyst. [Solution] The method comprises: a preliminary carbonization treatment step for obtaining rice husk biochar by putting a raw material containing rice husks into a solution containing iron and sulfuric acid, and performing hydrothermal carbonization treatment; a heat treatment step for mixing the rice husk biochar obtained in the preliminary carbonization treatment step with sodium chloride and urea, and then heating the mixture for heat treatment in a nitrogen atmosphere; and a neutralization step for obtaining an oxygen reduction reaction catalyst by subjecting the product obtained in the heat treatment step to acid treatment for neutralization.

The invention discloses a nitrogen / phosphorus co-doped fullerene material and a preparation method and application thereof.The nitrogen / phosphorus co-doped fullerene material is composed of fullerene, melamine and ammonium hypophosphite, the fullerene serves as a carbon skeleton precursor to form a rich pentagonal topological defect structure in the high-temperature pyrolysis process, and the nitrogen / phosphorus co-doped fullerene material is obtained; melamine and ammonium hypophosphite are respectively used as a nitrogen source and a phosphorus source, are decomposed at a high temperature and are uniformly doped with nitrogen and phosphorus atoms in a carbon skeleton. The method comprises the following steps: dissolving fullerene in carbon disulfide, adding melamine, uniformly mixing, heating until the carbon disulfide is completely volatilized, adding an ammonium hypophosphite solution, and pyrolyzing in an inert atmosphere to obtain the nitrogen / phosphorus co-doped fullerene material. The electrocatalyst provided by the invention has a relatively large specific surface area, can provide more active sites, and also can provide higher mass transfer efficiency and HO selectivity due to rich pores and a topological defect structure, so that the oxygen reduction reaction rate can be improved.

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.

The present invention provides a platinum-nickel catalyst gas diffusion electrode, its preparation method and application, belonging to the technical field of electrode materials. First, a conductive material and a polymer are dispersed in ethanol to obtain a dispersion liquid, and then the dispersion liquid is coated on a Ni mesh and subjected to calcination treatment to obtain a gas diffusion layer electrode. Then, the gas diffusion layer electrode is placed in an electrolyte for electrodeposition, and then calcination treatment is carried out to obtain the platinum-nickel catalyst gas diffusion electrode. The platinum-nickel catalyst gas diffusion electrode prepared by the present invention effectively solves the problem of slow kinetics of the 2e- electrochemical oxygen reduction reaction under neutral conditions, reduces the usage amount of noble metals, increases the production of hydrogen peroxide, shows high catalytic activity and stability, and can also remove harmful substances such as malachite green in water bodies.

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.