25results about How to "Increase intrinsic activity" patented technology

The invention discloses a nitrogen-doped carbon nanotube coated CoP / Co2P heterostructure electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of electrocatalytic materials. The preparation method comprises the following steps: by taking cobalt nitrate hexahydrate as a cobalt source and guanine as a carbon source and a nitrogen source, synthesizing a cobalt precursor by adopting a high-temperature carbonization method, then calcining the cobalt precursor to obtain a cobaltosic oxide precursor, and phosphating the cobaltosic oxide precursor to obtain the nitrogen-doped carbon nanotube coated CoP / Co2P heterostructure electrocatalyst. The catalyst has a relatively large specific surface area and multiple active sites, the specific surface area is 20-21m < 2 > / g, the pore size is distributed in a micropore-mesopore-macropore hierarchical pore structure, and the pore structure is mainly distributed in a range of 3-4nm. The preparation method of the catalyst comprises the following steps: (1) preparing a cobalt precursor; (2) preparing a cobaltosic oxide precursor; and (3) phosphating. The catalyst is high in catalytic reaction efficiency, and shows relatively good bifunctional activity and relatively strong stability in HER and OER.

The invention provides a bifunctional oxygen electrocatalyst with an asymmetric coordination structure and a preparation method and application thereof, a porous layered precursor is formed through an amide reaction between melamine and citric acid, and the special structure and different functional groups of the porous layered precursor provide many sites for insertion and adsorption of transition metal ions; and an asymmetric coordination structure with high active sites can be formed, the electronic structure of transition metal ions is effectively optimized, and the electro-catalytic performance is improved. The bifunctional oxygen electrocatalyst prepared by the invention shows excellent ORR / OER activity under alkaline conditions, and the power density of a zinc-air battery driven by the bifunctional oxygen electrocatalyst as a cathode catalyst reaches up to 226.7 mW cm <-2 >.

The invention discloses a preparation method and application of a bimetallic phosphate oxygen evolution electrode. The preparation method of the bimetallic phosphate oxygen evolution electrode comprises the following steps: cleaning a nickel substrate in an alkaline solution to remove oil, and cleaning the nickel substrate with pure water; soaking the cleaned nickel substrate in an acid solution, cleaning the nickel substrate with pure water, and placing the nickel substrate in the pure water for later use; the nickel substrate placed in the pure water serves as a cathode, two pure nickel materials are placed on the two sides of the nickel substrate to serve as two anodes, and electro-deposition is conducted on the nickel substrate in a bimetallic phosphate solution; and washing an electrode obtained after electrodeposition of the nickel substrate, and drying to obtain the bimetallic phosphate electrode. According to the preparation method, the adsorption free energy of a catalytic layer on the surface of the bimetallic phosphate oxygen evolution electrode on a reaction intermediate is optimized through the synergistic electronic effect of two metals, so that the intrinsic activity of oxygen evolution reaction is improved, meanwhile, a relatively stable catalytic layer structure is formed, and the stability of the bimetallic phosphate oxygen evolution electrode in the oxygen evolution process is improved.

The invention discloses a preparation method of a carbon-doped boron nitride catalyst and application of the carbon-doped boron nitride catalyst in synthesis of vinyl chloride through acetylene hydrochlorination. Comprising the following steps: 1) dissolving a boron source and a nitrogen source in a solvent to prepare a mixed solution; 2) heating, drying and calcining the solution obtained in the step 1) to obtain a porous boron nitride precursor; and 3) introducing a carbon source, and carrying out CVD treatment on the precursor obtained in the step 2) to obtain the carbon-doped boron nitride catalyst. The carbon-doped boron nitride catalyst disclosed by the invention can be applied to acetylene hydrochlorination to prepare and synthesize vinyl chloride, the conversion per pass of acetylene is 88.4% or above, the selectivity of vinyl chloride is 99.2% or above, and the service life can reach 400 hours or above. The method has the characteristics of simple and environment-friendly catalyst preparation process, low cost, excellent performance, small industrialization difficulty, good process repeatability and the like, is expected to replace a mercury catalyst in the existing calcium carbide process, and solves the problem of mercury emission pollution.

This invention discloses a palladium / ruthenium / two-dimensional monolayer titanium carbide macene nanosheet / three-dimensional nickel foam composite electrode, its preparation method, and its application. Belonging to the field of electrochemical materials technology, it addresses the problem of the lack of high-efficiency, high-degradation, and economical electrode materials in existing technologies, which limits the development of electrocatalytic degradation of antibiotics. The palladium / ruthenium / two-dimensional monolayer titanium carbide macene nanosheet / three-dimensional nickel foam composite electrode of this invention comprises, from the inside out, a nickel foam matrix, a two-dimensional monolayer titanium carbide macene nanosheet intermediate layer, a ruthenium intermediate layer, and a palladium layer. Using the palladium / ruthenium / two-dimensional monolayer titanium carbide macene nanosheet / three-dimensional nickel foam composite electrode as the working electrode, tetracycline-containing wastewater is degraded by electrochemical oxidation. It can efficiently degrade tetracycline in wastewater without causing secondary pollution to water bodies, thus achieving the goal of low-cost environmental protection and water conservation.

The present invention discloses a preparation and application of a CuS@NiCo‑LDHs hollow nano-octahedron heterojunction electrocatalyst. The preparation method comprises the following steps: using a Cu2O nano-octahedron as a hard template to undergo a precipitation conversion reaction with a soluble sulfide, growing a CuS shell layer on the surface of the Cu2O nano-octahedron, and obtaining a Cu2O@CuS nano-octahedron core-shell structure intermediate; etching the Cu2O@CuS nano-octahedron core-shell structure intermediate with an inorganic strong acid to remove the Cu2O core to obtain a CuS hollow nano-octahedron; heterogeneously growing a layer of NiCo‑LDHs nanosheets on the surface of the CuS hollow nano-octahedron to obtain the CuS@NiCo‑LDHs hollow nano-octahedron heterojunction electrocatalyst. The preparation method of the present invention is simple, the raw materials are abundant and easy to obtain, the time-consuming cycle is short, the product has high catalytic activity and good stability, and can be used for alkaline electrocatalytic oxygen evolution reaction.

The invention belongs to the technical field of catalysts, and discloses an iron-tantalum bimetal organic framework catalyst and a preparation method and application thereof. The iron-tantalum bimetal organic framework catalyst takes foamed nickel as a substrate, and a needle-shaped iron-tantalum bimetal organic framework material is uniformly loaded on the foamed nickel substrate. The preparation method comprises the following steps: carrying out acid etching on foamed nickel, then washing with ethanol and water in sequence, and drying; the preparation method comprises the following steps: uniformly dispersing water-soluble ferric salt and tantalum chloride in water to obtain a solution A; 2-hydroxyterephthalic acid is dissolved in a mixed solvent composed of absolute ethyl alcohol and N, N-dimethylformamide, and a solution B is obtained; dropwise adding the solution B into the solution A to obtain a solution C; obliquely placing foamed nickel into a hydrothermal reaction kettle, adding the solution C, completely soaking the foamed nickel, and reacting at 80-125 DEG C for 8-12 hours; and taking out the foamed nickel, washing with water, and drying to obtain the target catalyst. The catalyst prepared by the invention can realize low overpotential and excellent stability when being used for water electrolysis oxygen evolution reaction.

The invention discloses a semi-metal doped Fe-based monatomic catalyst as well as a preparation method and application thereof, relates to a Fe-based monatomic catalyst as well as a preparation method and application thereof, and aims to solve the problem that an iron-based non-noble metal monatomic catalyst is insufficient in activity and stability in an oxygen reduction reaction. According to the catalyst disclosed by the invention, atoms of Fe and Sb form atom pairs and are embedded into a carbon carrier, a Fe = 2N = Sb coordination structure is shown, and meanwhile, a hydroxyl group is formed in the axial direction of the Sb atom. The preparation method comprises the following steps: carrying out heat treatment on ZIF-8 to obtain an N-doped porous carbon material, uniformly mixing the N-doped porous carbon material with Fe salt and Sb salt solutions, drying by distillation, and carrying out heat activation to obtain the catalyst. After the prepared electrode is aged for 30,000 circles in a 0.1 M HClO4 solution, the half-wave potential is only reduced by 18mV. The assembled proton exchange membrane fuel cell has power densities of 1098.3 mW / cm < 2 > and 613.41 mW / cm < 2 > under hydrogen-oxygen and hydrogen-air conditions, and can be used in the field of fuel cells.

The invention belongs to the field of hydrogen energy and discloses a highly dispersed coated Co 3 O 4 / MoS 2 / CC heterostructure hydrogen evolution electrode material and preparation method thereof. The present invention uses cobalt-based MOF nanocones as precursor templates to prepare highly dispersed Co by ion exchange and in-situ sulfurization. 3 O 4 / MoS 2 / CC heterostructure, prepared highly dispersed coated Co 3 O 4 / MoS 2 When the / CC heterostructured self-supporting electrode material is used for acidic hydrogen evolution reaction, it can reach 10 mA cm ‑2 The overpotential of the current density is only 86.1mV, and the Tafel slope is 104.4mV·dec ‑1 , having good electrochemical hydrogen evolution catalytic performance and stability. The present invention adopts a method combining room temperature reaction with hydrothermal synthesis, which is simple to operate, low in cost, and suitable for large-scale production.

The invention belongs to the technical field of electro-catalysis, and particularly discloses a three-dimensional porous array carbon electrode which comprises a multi-scale pore structure composed of micron pores and nano pores, the specific surface area of the three-dimensional porous array carbon electrode is not lower than 200 m < 2 > g < 1 >, and the pore area is not lower than 50 m < 2 > g < 1 >. The invention discloses a preparation method of the three-dimensional porous array carbon electrode and an application of the three-dimensional porous array carbon electrode in water electrolysis hydrogen production. The three-dimensional porous array carbon electrode has a large pore area, high surface roughness, super-hydrophilic and hydrophobic properties and a porous array channel, overcomes the defects of a traditional foamed nickel electrode and a slurry casting electrode in industrial application, and can realize a large-scale, low-energy-consumption and high-stability industrial-grade hydrogen production process.

The invention relates to the technical field of electrode preparation, in particular to a laser electrode preparation method based on machine learning and flow field simulation optimization and an electrode thereof. The preparation method comprises the following steps: S1, constructing a parameter database; s2, preparing a precursor solution; s3, dropwise adding the precursor solution onto a sample, and then heating and drying the sample; s4, constructing a multi-channel electrochemical test module; s5, carrying out a high-throughput test on an alloy element formula on the electrode plate; s6, collecting sample data, and performing active learning optimization on the sample data; s7, an electrode structure is designed through flow field simulation; and S8, processing the base material loaded with the catalyst by using femtosecond laser subjected to space-time shaping to obtain the electrode material. And an efficient and low-cost solution for preparing the catalytic electrode is provided for the green hydrogen energy industry.

The present invention belongs to the field of materials and catalysis technology, and specifically relates to a Ni-Zn diatomic electrocatalytic oxygen reduction reaction catalyst and its preparation method and application. The catalyst includes a carrier and an active site, the carrier is a nitrogen-doped porous carbon carrier, the active site is Ni and Zn, the Ni and Zn are dispersed on the carrier in a diatomic form, and Ni and Zn are adjacent to each other in space; the active site contains Ni-N and Zn-N coordination. The preparation method of the present invention is simple, and the prepared catalyst performance, especially high intrinsic activity, good universality, high stability and low price.

This invention discloses a nickel-molybdenum hydrogen evolution electrode based on a surfactant complex, its preparation method, and its application, belonging to the field of water electrolysis for hydrogen production technology. The preparation method includes: pretreating a nickel mesh substrate and using it as the cathode for electrodeposition in an electroplating solution containing nickel salt, molybdate, complexing agent, and a complexed surfactant; the complexed surfactant consists of at least one anionic surfactant and at least one cationic surfactant. This invention, by introducing a complex system of anionic and cationic surfactants into the electrodeposition solution, synergistically regulates the electrocrystallization process, effectively refining the grains of the nickel-molybdenum alloy catalyst layer, increasing the number of active sites, and significantly reducing the hydrogen evolution overpotential. The electrode prepared by this method achieves a hydrogen evolution overpotential of 100 mA / cm². 2 At the specified current density, the overpotential can be as low as 92.8 mV, and it exhibits excellent stability. This method is simple, low-cost, and reproducible, making it suitable for large-scale preparation of high-performance water electrolysis hydrogen production cathodes.

The invention discloses a carbon dioxide and N2 efficient electro-catalysis urea synthesis method based on an electron cluster induced precipitation technology, and relates to the technical field of electro-catalysis, and the method comprises the following steps: S1, preparing a catalyst; comprising the steps of precursor preparation and crystallization-pyrolysis. S2, an electrocatalytic urea synthesis experiment; comprising the steps of experimental device construction, electrolyte and gas supply and electrochemical testing. S3, analyzing a reaction mechanism; according to the CoN3-CoAC / NC electrocatalyst constructed by adopting a crystallization-pyrolysis route, due to the electron precipitation effect generated by strong coupling of Co clusters and Co-N3 sites, redistribution of d-track charges is promoted, the reactant adsorption configuration is optimized, the C-N coupling barrier is reduced, the internal activity is improved, and the reaction kinetics is accelerated; the electron delocalization design based on the CoN3-CoAC / NC system breaks symmetrical electron arrangement of reactants, promotes electron transfer, and realizes effective urea electrosynthesis; and the CoN3-CoAC / NC catalyst shows excellent NRR (Nitrogen Ratio Ratio) and CO2RR (Carbon Oxide Ratio Ratio) properties.

The application discloses a ruthenium-based ammonia synthesis catalyst, a preparation method thereof and application of the catalyst in catalytic synthesis of ammonia. The ruthenium-based ammonia synthesis catalyst comprises a high-entropy oxide carrier and a ruthenium active component supported on the carrier; the high-entropy oxide is a single solid solution phase formed by oxides of at least three of Mg, Ca, Sr and Ba and at least two of La, Ce, Pr, Nd and Sm. The preparation method comprises the following steps: mixing soluble salts corresponding to each metal constituting the high-entropy oxide with an organic foaming agent in water, evaporating and concentrating to form a gel, heat-treating the gel at 110-150 DEG C to make the gel foam, and obtaining a porous and fluffy solid precursor; grinding the solid precursor and performing joule heating treatment in a non-oxidizing atmosphere, instantaneously heating the solid precursor to 600-1200 DEG C within 10 seconds, keeping the temperature for 1-10 seconds, and then cooling to obtain the high-entropy oxide carrier; and supporting the ruthenium active component on the high-entropy oxide carrier to obtain the ruthenium-based ammonia synthesis catalyst.

The invention discloses a ruthenium oxide nano material doped with two or more than two p-region metals and / or transition metals. The molecular formula of the ruthenium oxide nano material is one of the following types: type I: two or more than two p-region metal doped ruthenium oxide nano materials P < 1 > x < 1 > P < 2 > x < 2 >... P < n > x < n > Ru < 1-x-x < 2 >...-x < n > O < 2 >; or the type II is as follows: two or more than two transition metal doped ruthenium oxide nano materials T < 1 > y < 1 > T < 2 > y < 2 >... T < n > y < n > Ru < 1-y < 1-y < 2 >...-y < n > O < 2 >; or a type 3: a ruthenium oxide nanomaterial P < 1 > x < 1 > P < 2 > x < 2 >... P < n > x < n > T < 1 > y < 1 > T < 2 > y < 2 >... T < n > y < n > Ru < 1-x-x-x-2 >...-x < n >-y < 1-y > 2...-y < n > O < 2 > co-doped with the p-region metal (P) and the transition metal (T); wherein P < 1 > x < 1 >, P < 2 > x < 2 >,..., P < n > x < n > are p-region metal, and the p-region metal is selected from one or more of gallium, indium, germanium, tin, lead, antimony and bismuth; t1y1, T2y2,..., Tnyn are transition metals, and the transition metals are selected from one or more of titanium, zirconium, hafnium, cadmium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, rhenium, iron, cobalt, nickel, copper, zinc, palladium, osmium, cerium and praseodymium. The invention also discloses a preparation method of the nano material and application of the nano material in an electrode material.

The invention discloses a preparation method and application of a carbon-doped boron nitride catalyst for acetylene hydrochlorination. The method comprises the following steps: 1) mixing: heating in an oil bath, and dissolving a boron source, a nitrogen source and a carbon source in a mixed solvent of ethanol and water; 2) drying: drying the solution obtained in the step 1) to obtain a precursor; and 3) calcining: calcining the precursor obtained in the step 2) in an inert atmosphere to obtain the carbon-doped boron nitride catalyst. The prepared catalyst has the characteristics of ultrahigh specific surface area, rich porous structure and defect sites, controllable conductivity and the like, and can be applied to the process of efficiently preparing vinyl chloride through acetylene hydrochlorination. The preparation method is simple, the cost is low, the performance is excellent, the industrialization difficulty is small, the process repeatability is good, a mercury catalyst in an existing calcium carbide process is expected to be replaced, the problem of mercury emission pollution is solved, and a new technical route is provided for mercury replacement of the catalyst in the acetylene hydrochlorination process.

This invention relates to a C x N y This invention relates to a Pt@C fuel cell catalyst and its preparation method, belonging to the field of fuel cell catalyst technology. First, Pt@C is synthesized via a solvothermal reaction using ethylene glycol reduction. Then, it is mixed with a nitrogen-containing polymer material and cobalt chloride hexahydrate, and subjected to reduction in a reducing atmosphere, high-temperature treatment, carbon pyrolysis, and alloying to obtain porous nitrogen-containing carbon-coated Pt@C. x N y @PtCo / C catalyst. In the prepared catalyst, the porous coating layer significantly reduces the poisoning of catalyst particles by resin during fuel cell operation, improves cell activity, and extends cell life, exhibiting excellent activity and durability.

The invention relates to the technical field of catalysts, and particularly discloses a preparation method and application of a supported iridium-based OER catalyst, the supported iridium-based OER catalyst is prepared by adopting an innovative precursor salt double-hydrolysis synthesis method, the synthesis means of the method is simple and controllable, the reaction temperature is controlled to be 60 DEG C, and the reaction time is controlled to be 30 minutes. Compared with a traditional hydrothermal method and an ethylene glycol reduction method, the temperature required by the method is 160 DEG C or above, the method is lower in temperature and more energy-saving, and the method is favorable for obtaining uniformly dispersed ultra-small iridium oxide nanoparticles (2-3 nm). The loading capacity of Ir on a single electrode is 0.014 mg / cm, so that the problem of large use amount of iridium in the existing preparation process is solved, and the production cost is greatly reduced; and the performance of the catalyst is 6 times that of a commercial iridium oxide catalyst, and when the standard potential is 1.6 V, the current density can reach 75 mA cm <-2 >. Through an innovative synthesis strategy, the usage amount of precious metal is effectively reduced, the energy conversion efficiency is improved by the catalyst, and the catalyst has remarkable advantages in the aspects of economy and sustainability.

The invention relates to the technical field of sulfur-doped iron-aluminum bimetallic materials, in particular to a defect-rich S-FeAl LDHet catalyst and a preparation method and application thereof. A non-noble metal electrocatalyst S-FeAl LDH growing on a foamed nickel substrate in situ is synthesized through a hydrothermal method, then CV selective etching of Al sites is conducted on the catalyst S-FeAl LDH under the alkaline condition, the morphology and the electronic structure of the catalyst are regulated and controlled, and the defect-rich S-FeAl LDHet catalyst is formed. According to the invention, Al etching is carried out on the electrochemical window of the OER, so that the morphology of the catalyst does not change, and the mechanical strength of the catalyst is also retained. According to the method for constructing the defect by electrochemical in-situ etching of Al, the catalytic performance can be intuitively obtained through a CV curve. The optimal etching amount is determined according to the number of CV etching turns, and complete exposure of active sites is ensured. Meanwhile, the conductivity of the catalyst can also be optimized.

The invention belongs to the technical field of fuel cells, and provides an aperture-adjustable sulfur-nitrogen co-doped mesoporous carbon material for a fuel cell and a preparation method and application thereof.The preparation method comprises the steps that organic magnesium salt, a polyhydroxy compound capable of being fused and gelatinized at the temperature of 200-300 DEG C and a compound containing sulfur and nitrogen element compound-urea are used as raw materials; after dissolving and uniformly mixing, carrying out heating polymerization and microwave-assisted uniform dispersion; gradually converting the mixed solution into a uniform gel precursor along with the volatilization of the solvent; and grinding into powder, carrying out three-section gradient carbonization program heating carbonization treatment under the protection of inert atmosphere, and removing the template through acid pickling to obtain the target product. According to the present invention, the directional adjustment of the mesopore size and the pore size distribution is achieved, and by using the mesoporous structure as the fuel cell cathode catalyst carrier, the mass transfer path can be effectively optimized by using the high specific surface area and the adjustable mesoporous structure, and the oxygen reduction reaction activity, the polarization performance and the long-term stability can be significantly improved.

The application discloses a kind of high-dispersion cobalt-based catalyst and its preparation method and application, belong to cobalt-based catalyst technical field, the present application with four carboxyl phthalocyanine cobalt and nitrogen defect carbon nanotube as raw material, through molecular self-assembly in organic solvent and form pre-assembly complex, then the pre-assembly complex is programmed microwave heating, obtain the high-dispersion cobalt-based catalyst, the present application utilizes the means that specificity molecular precursor and carrier defect engineering are combined, by liquid phase pre-assembly constructs "molecular anchor-anchor position" pre-connection system, again with the principle of programmed microwave energy precise input, successfully solve the key technical problems that existing microwave method preparation cobalt-based catalyst when metal atom is easy to gather, active site structure is uncontrollable and catalytic performance is mediocre etc..

This invention relates to the field of fuel cell catalytic materials technology, specifically to a Pt anti-reverse electrode catalyst supported on molybdenum-ruthenium oxide for fuel cell anodes and its preparation method. The catalyst uses molybdenum-ruthenium oxide with a loose, porous structure as a support, and highly dispersed Pt nanoparticles as the active component, wherein Ru (Ru) serves as the active site for the oxygen evolution reaction (OER) under reverse electrode conditions. The method first utilizes a glucose blowing method and urea pyrolysis process to prepare a nitrogen-doped molybdenum-ruthenium oxide support through two-stage heat treatment under an oxidizing atmosphere. Subsequently, Pt nanoparticles are uniformly loaded onto the support surface using a polyol reduction method under an alkaline environment and an inert atmosphere. This invention utilizes the unique support structure and the OER activity of Ru to efficiently catalyze the OER reaction during anode reverse electrode conditions, suppressing excessive anode potential rise, thereby avoiding carbon support corrosion, protecting the integrity of the catalyst layer structure, and improving the durability and service life of proton exchange membrane fuel cells.

This invention discloses an indium oxide nanocrystal material and its preparation method, as well as a catalyst and its preparation method. The indium oxide nanocrystal material exhibits a sheet-like morphology with a size of 5-20 nm and a thickness of 2-5 nm. The preparation method of the indium oxide nanocrystal material is as follows: Under an air atmosphere, a solution containing an indium source and a reducing agent with a volume ratio of 0.3-0.4:10-20 and a molar ratio of 0.00075:1-0.0869:1 is reacted at a temperature of 140-220ºC for 4-48 hours to obtain the indium oxide nanocrystal material. This invention relates to the development of indium-based catalysts with higher activity, reducing the overpotential of formate formation, broadening the potential window for highly selective formate production, and improving the energy efficiency of ECO2RR.

The invention belongs to the technical field of electrolyzed water catalysts, and discloses a V-doped nickel phosphorus material as well as a preparation method and application thereof. According to the preparation method, a V-NiZn-LDH microsphere array is uniformly grown on NF through a hydrothermal method, then a precursor with abundant defects is obtained through a selective alkaline etching method, and the ferro-nickel phosphide V-Nivac2P / NF which is anchored on foamed nickel and has abundant surface defects is successfully prepared. In a 1M KOH solution, the prepared V-Nivac2P / NF self-supporting electrode shows excellent water electrolysis oxygen evolution performance and hydrogen evolution performance. An in-situ Raman spectrum shows that in the OER process, the defect obviously accelerates reconstruction from adjacent nickel atoms to a high-activity NiOOH substance, and the high-activity NiOOH substance becomes a real catalytic activity center. DFT calculation also shows that the introduction of vacancies can improve the conductivity of the catalyst, and in the step of adsorbing * OOH, V-Nivac2P / NF can effectively reduce the adsorption energy barrier of * OOH.