42results about How to "Increase intrinsic activity" patented technology

The invention relates to the technical field of nano catalytic materials, in particular to a preparation method and application of a nano bowl-shaped molybdenum-doped metal cobalt phosphide catalyst. The preparation method comprises the following steps: S1, preparing CoMo-MOF; S2, preparing Mo-CoP; according to the application method, the nanometer bowl-shaped molybdenum-doped metal cobalt phosphide catalyst is applied to the process of catalyzing water electrolysis hydrogen absorption and oxygen absorption reaction. According to the preparation method, the Mo-doped metal organic framework is adopted as a precursor, the target catalyst is prepared through phosphating and calcining, due to the fact that the valence state of Co in cobalt phosphide is improved through molybdenum doping, the intrinsic catalytic activity of the catalyst is improved, and electrolysis of water can be effectively catalyzed.

The invention relates to the technical field of electrochemical catalysis, in particular to a superfine nickel-doped ruthenium oxide water electrolysis hydrogen production catalyst prepared through a template method and application of the catalyst, the catalyst comprises a RuO2 matrix and a nickel element evenly doped in the matrix, and the mass of the nickel element accounts for 5%-20% of the total mass of the catalyst. According to the invention, the nickel element is doped into a RuO2 lattice, so that the charge distribution of RuO2 is optimized, the intrinsic activity of a catalytic active site is improved, and the catalytic performance of the oxygen evolution electrocatalyst of the material is improved; and meanwhile, ZIF8 is used as a template sacrificial agent, so that agglomeration among the nano-particles is reduced, and the uniformly dispersed metal nano-particles can be prepared.

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 discloses a double transition metal doped RuO2 acidic OER electrocatalyst and a preparation method and application thereof, relates to an OER electrocatalyst and a preparation method and application thereof, and aims to solve the technical problems of high overpotential and poor stability of the existing transition metal doped RuO2 catalyst.The catalyst is (M1) x (M2) yRuO2, M1 is Zr or Ti, and M2 is a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst. M2 is Mo, Nb or Tc; x is equal to 0.02 to 0.1, and y is equal to 0.02 to 0.1. The preparation method comprises the following steps: adding ruthenium salt, M1 salt, M2 salt and ethanol into water, putting the obtained mixed solution into a homogeneous reactor for hydrothermal reaction, washing and drying the product, and annealing. According to the present invention, the prepared electrode is loaded on carbon paper to prepare the electrode for acidic OER electro-catalysis, has the overpotential of 224 mV under the current density of 10 mAcm <-2 >, has excellent stability within 200 h, and can be used in the field of water electrolysis hydrogen production.

The invention discloses a method for yeast-assisted synthesis of porous carbon / vanadium sulfide nano-enzyme and application of the porous carbon / vanadium sulfide nano-enzyme in serum creatinine detection, and belongs to the technical field of serum creatinine detection. Comprising the following steps: (1) mixing saccharomycetes, vanadium chloride and ethanol, performing ultrasonic dispersion, and stirring until liquid is completely volatilized to obtain a first solid A; (2) mixing and grinding the first solid substance A, potassium carbonate and potassium chloride to obtain a second solid substance B; (3) respectively placing the second solid substance B and thioacetamide in grooves at the left end and the right end of a Joule thermal device graphite sample table, and carrying out rapid Joule thermal shock to obtain a third solid substance C; and (4) washing and drying the third solid C to obtain the porous carbon / vanadium sulfide nano-enzyme. A colorimetric sensing method is constructed based on the nano-enzyme prepared by the invention, is used for creatinine detection, and has extremely low detection limit, LOD is as low as 0.07 M / mL, and high specificity and sensitivity are embodied.

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 discloses a water splitting electrocatalyst and a preparation method thereof, and belongs to the technical field of water electrolysis hydrogen production and new energy. Aiming at the problems of high catalyst cost, slow mass transfer and poor stability in industrial-scale water electrolysis hydrogen production, the graded core-shell heterostructure transition metal nitrogen / phosphide composite material is formed on the surface of metal foam through hydrothermal, nitridation and electrochemical deposition. The composite material has high catalytic activity on hydrogen evolution and oxygen evolution of electrolyzed water, can stably react for thousands of hours in a simulated industrial environment (30% KOH-60 DEG C) under the current density of 1 A cm <-2 >, and shows excellent water splitting catalytic performance and ultrahigh stability.

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 present invention relates to the technical field of electrocatalyst preparation, and provides a Pt@PtNi@Pt core-shell structure nanowire, a preparation method and an application thereof. The method comprises: mixing oleylamine and octadecene, Pt(acac)2, Ni(acac)2, hexadecyltrimethylammonium bromide and glucose; adding the mixed solution into a high-pressure reactor, introducing a mixed gas environment, wherein the content of hydrogen in the mixed gas is 10% to 40%; heating to obtain Pt@PtNi@Pt; dispersing superconducting carbon black in ethanol, dispersing Pt@PtNi@Pt in n-hexane, and mixing; centrifugation, drying, and obtaining Pt@PtNi@Pt core-shell structure nanowire. The present invention improves the activity and durability of the Pt@PtNi@Pt core-shell structure nanowire, thereby improving the efficiency of hydrogen production by electrolysis of water.

The invention discloses a preparation method of a CuS (at) NiCo-LDHs hollow nano octahedral heterojunction electrocatalyst and an application of the CuS (at) NiCo-LDHs hollow nano octahedral heterojunction electrocatalyst. The preparation method comprises the following steps: taking a Cu2O nano octahedron as a hard template to generate a precipitation conversion reaction with soluble sulfide, and growing a CuS shell layer on the surface of the Cu2O nano octahedron to obtain a Cu2O coated CuS nano octahedron core-shell structure intermediate; an inorganic strong acid is used for etching the Cu2O coated CuS nano octahedron core-shell structure intermediate, so that a Cu2O core is removed, and a CuS hollow nano octahedron is obtained; and heterogeneously growing a layer of NiCo-LDHs nanosheets on the surface of the CuS hollow nano octahedron to obtain the CuS coated NiCo-LDHs hollow nano octahedron heterojunction electrocatalyst. The preparation method is simple, the raw materials are rich and easy to obtain, the consumed time period is short, and the product is high in catalytic activity and good in stability and can be used for alkaline electro-catalysis oxygen evolution reaction.

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 belongs to the field of platinum-carbon catalyst modification, and particularly discloses a modification method of a platinum-carbon catalyst for selective passivation of low coordination sites and the platinum-carbon catalyst.The modification method comprises the steps that an initial platinum-carbon catalyst is subjected to reduction activation so as to fully expose the low coordination sites on platinum particles; enabling the passivator precursor to be adsorbed on the exposed low coordination sites, and then enabling the passivator precursor on the low coordination sites to be converted into a passivator through an activating agent, so as to obtain a passivator modified platinum-carbon catalyst precursor; and carrying out heat treatment on the platinum-carbon catalyst precursor in a reducing atmosphere to obtain the platinum-carbon catalyst. According to the method, the activity of low coordination sites of platinum particles in the platinum-carbon catalyst can be accurately inhibited, the stability of the platinum-carbon catalyst is improved, the intrinsic activity of the oxygen reduction reaction of the platinum-carbon catalyst can be further improved, and large-scale application is facilitated.

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.

The invention belongs to the technical field of catalysts, and particularly relates to a fatty acid salt catalyst as well as a preparation method and application thereof. Comprising the following steps: 1) mixing waste oil with water, heating, standing for layering to remove a lower-layer solution, adding alkali liquor into an upper-layer solution, heating, standing for layering to obtain an intermediate product; and 2) adding the intermediate product obtained in the step 1), a metal inorganic salt solution and methanol into a reactor, heating, washing and drying to obtain the fatty acid salt catalyst. The catalyst shows high catalytic activity, good dispersion performance and high stability in the coal / heavy oil hydro-conversion process, and is easy to store. The raw materials are wide in source and low in cost, and have remarkable economic advantages. Meanwhile, the application of the catalyst also solves the problem of utilization of waste oil, not only reduces environmental pollution, but also can turn waste oil into wealth. In the hydro-conversion process, the waste oil can be converted into valuable oil products, and synergistic conversion and utilization of the waste oil are achieved.

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 a (CoFe) Se2 (at) (CoFe)-N-C nano composite material as well as a preparation method and application thereof. The (CoFe) Se2 (at) (CoFe)-N-C nano composite material is of a core-shell-like structure and is in a cubic box shape, a core is porous (CoFe) Se2, the porous (CoFe) Se2 serves as the core, nitrogen-doped carbon serves as a shell, and the nitrogen-doped carbon shell captures metal atoms on the edge of the (CoFe) Se2 to form a (CoFe)-N-C structure. The preparation method is simple, the yield is large, the cost is low, the OER performance is higher than that of most non-noble metal catalysts and noble metal IrO2 catalysts when the catalyst is used as an electrocatalyst, and the catalyst maintains high catalytic ability in an alkaline environment for a long time; compared with a single-active-substance catalyst, the double-active-substance catalyst provides more active sites in an electro-catalytic reaction and has excellent catalytic capability.

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.