1602 results about "Cobalt salt" patented technology

The invention provides a nano enzyme as well as a preparation method and application thereof. The preparation method of the nano enzyme comprises the following steps: adding a stabilizer into a preheated solvent, and carrying out ultrasonic treatment; then adding ferric salt and cobalt salt, and adding alkali to adjust the pH value of the solution; then transferring the solution into a reaction kettle for reaction; and after the reaction, washing and separating to obtain the product. The obtained nano-enzyme is appropriate and uniform in particle size and good in dispersity, the enzyme activity is as high as 9.56 U / mg, and the application of the nano-enzyme in immunochromatography detection and plant canker prevention and treatment is widened. When the immunochromatography detection card prepared from the nano enzyme is used for detecting human hemoglobin, the detection limit can reach 0.05 ng / mL and is at least 10 times lower than that of a commercially available kit. When the nano-enzyme suspension is used for preventing and treating the kiwifruit canker, the nano-enzyme suspension with the concentration larger than or equal to 0.1 mg / mL is used, and the plant canker can be well controlled.

The invention provides a production process of cobalt salt high-purity MO source electronic chemicals, relates to the technical field of chemical production processes, and realizes automation and intelligence of the production process by optimizing links such as pretreatment, dissolution and chemical reaction, intelligent crystallization separation, drying and vacuum sublimation of raw materials. The core technology comprises an improved long short-term memory (LSTM) algorithm used for adjusting dissolution conditions in real time, a Bayesian optimization algorithm used for optimizing the crystallization process, a self-adaptive dynamic programming algorithm used for optimizing energy consumption, and a support vector machine used for intelligent anomaly detection. The digital twin technology simulates and optimizes the production process, ensures the high purity and stability of the product, optimizes the reaction conditions, crystallization process, drying and vacuum sublimation steps in each process link, and ensures the high purity of the cobalt salt product.

The invention discloses preparation and application of a diatomic catalyst modified carbon felt electrode. The preparation method of the modified carbon felt electrode comprises the following steps: dissolving bismuth salt, cobalt salt and urea in water to obtain a complexing solution; immersing the carbon felt substrate subjected to acid activation into a complexing solution for soaking treatment, then taking out the carbon felt substrate, and drying to obtain a precursor-loaded carbon felt; and sequentially carrying out primary heating, cold shock and secondary heating treatment on the precursor-loaded carbon felt, and cooling to obtain the Bi-Co diatom modified carbon felt electrode. The carbon felt electrode can be applied to an all-vanadium redox flow battery. The innovation point of the invention lies in that through the synergistic effect of double atoms and the mutual cooperation of the nitrogen-doped carbon substrate, the intrinsic activity bottleneck of the traditional catalyst is broken through, the comprehensive advantages of high catalytic activity, excellent stability and low cost are achieved, and a new technical solution is provided for the high performance and large-scale application of the flow battery.

The invention discloses a method and a device for synthesizing a metal precursor organic carbonyl cobalt compound, which are particularly suitable for synthesizing and preparing dicarbonyl cyclopentadienyl cobalt and (3, 3-dimethyl-1-butyne) hexacarbonyl cobalt. The method comprises the following steps: S01-S07, weighing the following raw materials: 120 parts of activated carbon, 250 parts of water, 3-9.1 parts of gold chloride, 118.9-129.8 parts of cobalt salt, a 40%-80% hydrazine hydrate aqueous solution, a 30% sodium hydroxide aqueous solution, 500 parts of dichloromethane and 69.4 parts of a cyclopentadiene monomer; the preparation method comprises the following steps: adding activated carbon, gold chloride, cobalt salt and water into a reaction kettle, starting stirring, controlling the temperature at 10-15 DEG C, dropwise adding a 40% hydrazine hydrate aqueous solution, and slowly heating to 50-55 DEG C after dropwise adding; and filtering the reaction liquid, drying the filtered solid, and putting into a reaction kettle. According to the invention, cobalt salt with wide source and low price is used as a raw material to synthesize the carbonyl cobalt compound, and the carbonyl cobalt compound does not need to be synthesized by taking cobalt octacarbonyl with high price and the like as a carbonyl cobalt source to react with corresponding organic matters.

The invention discloses a CoFeCuMn LDH nanosheet, a confinement catalytic membrane and a preparation method of the CoFeCuMn LDH nanosheet. The preparation method of the CoFeCuMn LDH nanosheet comprises the steps that A1, cobalt salt, ferric salt, copper salt and manganese salt are dissolved in pure water according to a preset proportion to prepare a first solution, sodium hydroxide is dissolved in pure water to prepare a second solution, and sodium carbonate is dissolved in pure water to prepare a third solution; a2, adding the first solution and the second solution into the third solution, and stirring to obtain a mixed solution; a3, carrying out hydrothermal reaction on the mixed solution; a4, centrifugally washing the product obtained in the step A3 to obtain a precipitate; and A5, the sediment is dried, and the CoFeCuMn LDH nanosheet is obtained. According to the CoFeCuMn LDH nanosheet, the confinement catalytic membrane and the preparation methods of the CoFeCuMn LDH nanosheet and the confinement catalytic membrane, the degradation efficiency and the degradation rate of new pollutants are remarkably improved.

The invention relates to a preparation method of Pt monatomic nano-enzyme and application of Pt monatomic nano-enzyme in cardiac troponin I. The preparation method comprises the following steps: 1) ultrasonically dispersing cobalt salt, selenium powder, chloroplatinic acid, urea and sodium chloride in an alcohol solvent, heating and stirring until the solvent is completely volatilized to obtain a solid mixture, and grinding the solid mixture into powder; and 2) placing the powder in a heating device, carrying out Joule heat treatment in an air atmosphere, washing a reactant, and carrying out vacuum drying to obtain the Pt monatomic nano-enzyme. Se doping is introduced in the one-step chemical reaction process to construct oxygen vacancies, rapid heating and structural shaping are achieved in combination with Joule heat treatment, the Se-doped Co3O4-loaded Pt monatomic catalyst is obtained, the oxygen vacancies and Se doping sites are synergistically used as anchoring sites, Pt monatomic atoms are effectively fixed, and the loading capacity and dispersity of the Pt monatomic atoms are improved. The obtained material shows excellent POD-like enzyme activity, can be used for constructing a high-sensitivity colorimetric immunoassay system, and realizes rapid and accurate detection of cTnI.

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to cobalt carbonate and a preparation method thereof, cobaltosic oxide and a lithium ion battery. The crystal grain size of the cobalt carbonate (104) crystal face is 200-250, and the median particle size Dv50 is 16-20 [mu] m. The preparation method of the cobalt carbonate comprises the following steps: adding a precipitant solution and a cobalt salt solution into a reaction kettle in a parallel flow manner, carrying out a co-precipitation reaction, controlling the reaction pH value, starting a thickener when the volume of a material in the reaction kettle reaches a target value, continuing the reaction until large-particle cobalt carbonate slurry is obtained, and carrying out solid-liquid separation and washing to obtain the cobalt carbonate. Cobalt carbonate is subjected to first sintering, mixed with a doping agent and then subjected to second sintering, and cobaltosic oxide with the (311) crystal face grain size being 660-700 and the median particle size Dv50 being 14-18 microns is prepared. The cobaltosic oxide is high in mechanical strength and good in reaction activity with a lithium source, and the prepared lithium cobalt oxide positive electrode material is relatively excellent in electrochemical performance.

The invention belongs to the technical field of catalysts, and relates to a surface-reconstructed heterojunction catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving cobalt salt, ferric salt and praseodymium salt in deionized water, heating and spraying on a carrier to prepare praseodymium-doped ferrocobalt layered double hydroxide; mixing the praseodymium-doped ferrocobalt layered double hydroxide with a phosphorus source, and calcining in an inert atmosphere to prepare praseodymium-doped CoP / Fe2P; and carrying out electrooxidation treatment on the praseodymium doped CoP / Fe2P, so as to prepare the Pr6O11 cluster modified CoFeOOH heterojunction catalyst. Through cooperation of three technologies of spray thermal deposition, phosphating and electrooxidation, stable construction and electrochemical activation of a heterogeneous interface are realized, the corrosion resistance and chlorine evolution resistance competitive capacity of the catalyst in a chlorine-containing alkaline system are remarkably improved, the current density of 100 mA. Cm <-2 > can be achieved only through 223 mV overpotential, and meanwhile, stable operation is performed for 500 h.

The invention provides a NiCo double hydroxide self-supporting nano-catalyst as well as a preparation method and application thereof, and belongs to the field of nano composite materials. The preparation method of the NiCo double hydroxide self-supporting nano-catalyst is characterized by comprising the following steps: firstly, adding cobalt salt and nickel salt into a solvent, performing ultrasonic treatment to completely dissolve the two metal salts to obtain a metal salt solution, and then assembling a working electrode, a counter electrode and a reference electrode in the metal salt solution to obtain a three-electrode device, and finally, adjusting corresponding parameters in an electrochemical workstation, and carrying out a self-supporting deposition experiment of Ni and Co double-metal hydroxides on the three-electrode device in the electrochemical workstation to obtain the NiCo double-metal hydroxide self-supporting nano-catalyst material with a typical scaly structure and excellent performance. According to the preparation method of the NiCo double-metal hydroxide self-supporting nano-catalyst material, product treatment is convenient and fast, and the process is simple.

The invention belongs to the technical field of water treatment materials, and particularly relates to a spin state gradient regulation cobalt monatomic catalyst and a preparation method and application thereof.The preparation method comprises the steps that cobalt salt is loaded on a metal organic framework material ZIF-8, heating pyrolysis is conducted in an inert atmosphere, and a Co-N4 precursor is formed; after sulfur-containing gas is introduced, secondary heating pyrolysis is carried out, so that nitrogen coordination is gradually replaced by sulfur atoms; and sequentially carrying out acid washing and alkali washing on the pyrolysis product to obtain the spin-state gradient-regulated cobalt monatomic catalyst Co-SxN (4-x), and x is equal to 1-3. The Co and ZIF-8 compound is used as a Co monatomic dispersion template, so that Co atoms are uniformly dispersed in pore channels and nodes of ZIF-8, and metal agglomeration in the high-temperature carbonization process is avoided. And the sulfur doping gradient is utilized to regulate and control the spin state of cobalt monatomic, so that the synergistic improvement of catalytic activity and stability is realized, and the purpose of efficiently degrading and removing organic pollutants in water is achieved.

The invention belongs to the technical field of supercapacitor electrode materials, and discloses a NiCoMoMnM-LDH high-entropy material and preparation and application thereof.The preparation method comprises the steps that a nickel salt, a cobalt salt, a manganese salt, an M salt and an ethanol water solution form a solution A; forming a solution B from molybdate, 2, 5-dihydroxy terephthalic acid and an organic solvent; mixing the solution A and the solution B, and performing hydrothermal reaction to obtain a precursor; dispersing the precursor in a sodium hydroxide solution, stirring, carrying out solid-liquid separation, washing, and drying to obtain a NiCoMoMnM-LDH high-entropy material; m salt is any one of zinc salt, ferric salt and copper salt. The preparation method disclosed by the invention not only avoids phase separation and element aggregation in the forming process of the high-entropy material, but also is high in universality, and the high-entropy hydroxide can be efficiently synthesized on a large scale; and the prepared high-entropy material is high in specific capacitance and good in rate capability and cycling stability, and can be applied to a positive electrode material of a supercapacitor.

The invention discloses a high-entropy layered double hydroxide with a strong strain effect and a preparation method of the high-entropy layered double hydroxide. The preparation method comprises the following steps: firstly, preparing ferric salt, cobalt salt, nickel salt, copper salt and zinc salt into a mixed aqueous solution of five metal salts; preparing sodium hydroxide and sodium carbonate into an alkali source aqueous solution; then mixing and stirring the mixed aqueous solution of the five metal salts and the alkali source aqueous solution to gradually form yellowish-brown precipitates, then transferring the yellowish-brown precipitates into a polytetrafluoroethylene reaction kettle, and further reacting in a drying oven; and finally, carrying out centrifugal separation, deionized water and absolute ethyl alcohol washing and freeze drying on the fully reacted precipitate to obtain brown powdery solid, namely the high-entropy layered double hydroxide. The high-entropy layered double hydroxide can be used for advanced oxidation catalytic degradation of tetracycline antibiotic wastewater, the strong strain effect of the high-entropy layered double hydroxide enhances the benefit of activating peroxymonosulfate to generate active free radicals, the efficiency of degrading water pollutants is improved, and the high-entropy layered double hydroxide has good application prospects.

The invention relates to the technical field of methane cracking and hydrogen production, and discloses a metal-modified Co-Bi liquid alloy catalyst, wherein the catalyst uses Co as an active component, uses Bi low melting point metal as a solvent, and uses a third metal M as an auxiliary agent; the invention also discloses a method for preparing the catalyst, comprising: calcining a cobalt salt to generate cobalt oxide, and then forming CoO-MO X The mixture powder was finally heated under N2 and H2 atmosphere to obtain CoO‑MO X The powder is mixed with elemental Bi to obtain a cobalt-bismuth ternary liquid alloy catalyst; the present invention also discloses a method for applying the catalyst to methane cracking and hydrogen production, comprising: heating the preheating furnace to a certain temperature, introducing pure methane gas, and reacting under normal pressure, at a temperature of 500 to 700°C, with a methane space velocity of 1 to 100 mL / g·min, and after the reaction is completed, the temperature drops to room temperature in an N2 atmosphere, and the carbon product is taken out of the reaction tube after cooling. The catalyst disclosed by the present invention has the advantages of high activity, good stability, strong methane cracking ability, mild reaction conditions, simple preparation process, and long life.

The invention relates to the technical field of electro-catalysis and hydrogen energy, in particular to a modified LDH-based catalyst and a preparation method and application thereof. The preparation method comprises the following steps: mixing trimesic acid, water, an organic solvent, a nickel salt, a cobalt salt and an iron salt, carrying out electro-deposition, washing and drying to obtain a NiFeCo-LDH (TA) catalyst; the preparation method comprises the following steps: soaking a NiFeCo-LDH (TA) catalyst in a silver salt solution, washing and drying to obtain the modified LDH-based catalyst. The modified LDH-based catalyst provided by the invention can effectively resist chloride ion corrosion and inhibit dissolution of active metals in layered double hydroxides (LDH) under high current density in seawater, can reach industrial grade current density under relatively low overpotential, and can stably run for more than 1000 hours.

The invention discloses cobalt hydroxide and a preparation method and application thereof, and belongs to the technical field of battery materials. The preparation method comprises the following steps: carrying out precipitation reaction on a soluble cobalt salt solution, a precipitant solution and a complexing agent solution; the precipitant is a NaOH solution; the complexing agent is a surfactant, and the surfactant comprises at least one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, hexadecyl trimethyl ammonium bromide, polyoxyethylene polyoxypropylene ether, polyvinylpyrrolidone, polyethylene glycol and the like. The method is simple to operate, the process is easy to control, the cobalt hydroxide which is different in size and has a unique space-staggered nanosheet structure can be obtained by regulating and controlling the surfactant, the utilization rate of active substances can be increased, the charge-discharge cycle life can be prolonged, and the conductivity and the charging efficiency of the electrode can be improved. The thermal stability and the structural stability of the positive electrode material can be improved by taking the material as a coating layer, and the interface reaction between the positive electrode material and electrolyte is inhibited, so that the cycling stability is enhanced.

The invention relates to a sunken porous magnetic alloy ball wave-absorbing material and a preparation method and application thereof.The wave-absorbing material is prepared through the following steps that S1, citric acid, soluble ferric salt, soluble cobalt salt and soluble nickel salt are dissolved in a mixed solvent of ethylene glycol and water, and the mixture is fully stirred to form a uniform mixed solution; and S2, the mixed solution obtained in the step S1 is subjected to spray drying, obtained precursor powder is placed in the air atmosphere to be calcined to remove the carbon source, then the precursor powder is placed in the H2 / Ar atmosphere to be subjected to heating reduction, and the porous FeCoNi alloy balls with the surface pits are obtained and are the target product. The surface of the prepared alloy microsphere has an obvious concave structure, magnetic anisotropy and magnetic performance are enhanced, a small number of pores are generated in the reduction process, impedance matching of the material is optimized, and effective high-frequency electromagnetic absorption is achieved; and due to the synergistic effect of the recesses and the pores, the obtained alloy microspheres have obvious lightweight characteristic, and have good application prospects in the field of electromagnetic absorption.

The invention discloses an amorphous NiCoMox Mny heterojunction electrode material doped with crystalline Ag and a preparation method of the amorphous NiCoMox Mny heterojunction electrode material, the amorphous NiCoMox Mny heterojunction electrode material is composed of amorphous NiCoMox Mny and crystalline Ag, the crystalline Ag is doped in the amorphous NiCoMox Mny, in the amorphous NiCoMox Mny, x is larger than 0 and smaller than or equal to 1, y is larger than or equal to 0 and smaller than 1, and x + y is equal to 1. A one-step hydrothermal method is adopted for preparation, foamed nickel and a mixed solution in which cobalt salt, ammonium molybdate (or / and manganese salt) and silver salt are dissolved are evenly mixed, the foamed nickel serves as a Ni source and serves as an oxidizing agent for replacement to obtain crystalline Ag, the crystalline Ag is further doped into amorphous NiCoMox Mny to form the heterojunction electrode material, the method is simple, operation is controllable, the yield is high, and the method is suitable for industrial production. The repeated effect is good, and large-scale production is easy to realize.

The invention discloses a high-entropy metal oxide catalyst as well as a preparation method and application thereof in CO catalytic oxidation, and belongs to the technical field of flue gas treatment. The preparation method comprises the following steps: dissolving copper salt, manganese salt, cerium salt, cobalt salt, vanadium salt and a dispersing agent into water to form a uniform solution, and slowly adding excessive alkali precipitant into the uniform solution to form a solid-liquid mixture; the solid-liquid mixture is transferred into a high-pressure kettle to be subjected to a hydrothermal reaction and then quenched, an obtained hydrothermal reaction product is calcined, and the high-entropy metal oxide catalyst is obtained and is high in catalytic oxidation activity on carbon monoxide at the low temperature, excellent in water resistance and sulfur resistance and particularly suitable for treatment of complex flue gas.

The present invention discloses a layered metal hydroxide composite catalytic material, its preparation method and application. The composite catalytic material comprises a carrier carbon nanotube and a metal hydroxide loaded on the carbon nanotube, and the metal is iron, cobalt and nickel. Preparation method: (1) Dissolve nickel salt, cobalt salt, iron salt and urea in an alcohol solution, stir evenly, then add carbon nanotubes, and continue to stir evenly to obtain a mixed solution; (2) Carry out a solvothermal synthesis reaction on the mixed solution obtained in step (1), filter, wash and dry after the reaction is completed to obtain the layered metal hydroxide composite catalytic material. The carbon nanotubes are introduced into the layered metal hydroxide in this composite catalytic material, reducing the precipitation of metal ions, avoiding the aggregation of hydroxides, improving the stability and catalytic activity of the catalytic material, and being used for activating persulfate to degrade organic pollutants, realizing the efficient activation of persulfate so as to improve the degradation rate of pollutants.

The invention discloses a preparation method of CoWO (cobalt tungsten oxide) modified NbOp-n heterojunction NbO5 / CoWO photocatalyst powder. The preparation method comprises the following steps: dissolving cobalt salt and tungsten salt in deionized water, stirring and mixing, carrying out hydrothermal reaction in an autoclave, washing and drying to obtain CoWO powder; the preparation method comprises the following steps: dissolving niobium oxalate and ammonium carbonate in deionized water, adding CoWO powder, carrying out a hydrothermal reaction in an autoclave, and carrying out washing and drying treatment to prepare NbO / CoWO photocatalyst powder. According to the method, the hydrothermal reaction temperature is regulated and controlled, and the mass ratio of raw materials is optimized, so that the catalyst forms a p-n heterojunction structure of NbOmicron flower loaded CoWOnano particles. The prepared catalyst has high norfloxacin wastewater degradation efficiency under visible light irradiation, has the advantages of simple preparation process, low reagent cost, high catalytic activity and good structural stability, and can be effectively applied to purification treatment of antibiotic polluted water.

The invention relates to the technical field of capacitor electrode materials, in particular to a biomass derived porous carbon and layered double hydroxide (LDH) composite material and a preparation method and application thereof. The invention provides a preparation method of a biomass-derived porous carbon and LDH composite material, which is characterized by comprising the following steps: mixing biomass-derived porous carbon, nickel salt, cobalt salt, ethylene glycol, hexamethylenetetramine and water, and carrying out hydrothermal reaction to obtain the biomass-derived porous carbon and LDH composite material, the pore structure of the biomass derived porous carbon comprises micropores, mesopores and macropores. The biomass derived porous carbon and LDH composite material has good specific capacitance, energy density and cycling stability, and can be used as a high-performance supercapacitor electrode material.

The invention discloses a nano-alloy catalyst for anion exchange membrane electrolyzed water and a preparation method of a membrane electrode of the nano-alloy catalyst, when any one of manganese salt, cerium salt, chromium salt, cobalt salt, lanthanum salt, ruthenium salt and iridium salt is not added, NiFe binary alloy powder is obtained, the content of Ni is 90%-100%, and the content of Fe is 0%-10%; when any one of manganese salt, cerium salt, chromium salt, cobalt salt, lanthanum salt, ruthenium salt and iridium salt is added, NiFe ternary alloy powder is obtained, the content of Ni is 76%-96%, the content of Fe is 4%, and the content of the third element is 0%-20%. The nano-alloy catalyst material for anion exchange membrane water electrolysis prepared according to the invention is good in corrosion resistance and high in stability, the total water splitting efficiency is further improved, the synthesis method is simple, the used metal salt is low in cost, the metal salt can be uniformly loaded on a substrate carrier through spraying, and industrial application of total water splitting under high current density is easy to realize.

The invention relates to a low-temperature and high-airspeed rare-earth-based denitration catalyst as well as a preparation method and application thereof, and belongs to the field of air pollution control. The preparation method comprises the following steps: preparing an active component solution from cerium salt, manganese salt and cobalt salt, then adding urea as a pH regulator, and carrying out hydrothermal treatment, centrifugal washing, drying and roasting. The catalyst is excellent in low-temperature denitration performance and good in low-temperature water and sulfur resistance stability. The catalyst prepared by the method can still maintain more than 90% of denitration activity at the air speed of 200000h <-1 > and the temperature of 105-270 DEG C, and can maintain about 80% of denitration efficiency under the flue gas working conditions of 150 DEG C, 5% of H2O and 50 ppm of SO2. The catalyst is especially suitable for efficient purification of NOx under the low-temperature, high-space-speed, water-containing and sulfur-containing complex flue gas working condition in the cold start stage of a motor vehicle.

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. The cobalt ferrite particles are obtained by a method for producing cobalt ferrite particles, including performing a thermal treatment on an aqueous solution containing a divalent iron salt and a divalent cobalt salt stabilized by a complexing agent (ferrite precursor).

The invention discloses a bimetallic MOFs mediated morphology-controllable catalyst, a preparation method and application thereof, and the preparation method comprises the following steps: respectively adding an iron salt, a cobalt salt and an organic ligand into an organic solvent, and then adding an alkaline regulator and a surfactant; transferring the stirred solution into a reaction kettle to carry out solvothermal reaction, and centrifuging, washing and drying the suspension after the reaction to obtain a bimetal organic framework (MOFs) precursor; and carrying out heat treatment in a gas atmosphere to obtain the catalyst. The bimetallic MOFs are obtained through a one-step solvothermal method, the size and morphology of the product are regulated through the alkaline regulator, agglomeration of catalyst nanoparticles can be reduced by adding the surfactant, the preparation method is simple, the specific surface area of the product is high, and when the catalyst is used for preparing high-carbon hydrocarbon through catalytic hydrogenation of carbon dioxide, the yield of the product is high. The conversion rate of carbon dioxide reaches up to 47.82%, the selectivity of high-carbon hydrocarbon reaches 59.68%, the selectivity of by-products carbon monoxide and methane is low, and the catalytic activity is good.

The invention discloses a catalytic electrode which comprises a substrate, and an anti-corrosion layer and a sulfur-phobic layer which are sequentially attached to the substrate, the substrate is a blank foamed nickel substrate, the anti-corrosion layer is formed by dipping the foamed nickel substrate with a ferric salt solution, and the sulfur-phobic layer is formed by processing a precursor with a cobalt salt solution through electro-deposition. Accordingly, a corresponding preparation method is also established, a blank foamed nickel substrate is adopted, firstly, the foamed nickel substrate is subjected to dipping treatment with an iron salt solution to obtain a precursor with an anti-corrosion layer, and then the precursor is subjected to electro-deposition treatment with a cobalt salt solution to form the sulfur-phobic layer on the anti-corrosion layer. Wherein the anti-corrosion layer can isolate a high-sulfur environment and prevent the substrate from being corroded; the sulfur phobic layer may prevent sulfur products from depositing and passivating the electrode. The catalytic electrode provided by the invention solves the problems of sulfur reaction corrosion and passivation, shows excellent catalytic activity and stability, and can be used for catalyzing sulfur oxidation reaction for a long time. In conclusion, the method has the advantages of mild conditions, simple process, economy and practicability, and has obvious large-scale industrial production potential.

The invention belongs to the technical field of ammonia synthesis and electro-catalysis, and particularly relates to a preparation method and application of high-entropy alloy aerogel for electro-catalysis. The preparation method comprises the following steps: mixing an inorganic metal salt in a solvent to obtain a precursor solution, quickly adding a reducing agent, standing, and washing and drying the obtained product to obtain the high-entropy alloy aerogel catalyst, the inorganic salt is selected from five or more of copper salt, cobalt salt, iron salt, nickel salt, palladium salt, gold salt, ruthenium salt, platinum salt and silver salt. The three-dimensional continuous porous reticular high-entropy alloy aerogel is obtained through one-step reduction of the inorganic metal salt and standing assembly, the high-entropy alloy aerogel prepared through the method is high in reduction assembly speed, phase separation of multi-component alloy can be effectively inhibited, an amorphous alloy structure is obtained, and therefore when the high-entropy alloy aerogel is applied to ammonia production through electro-catalysis nitrate reduction, the high-entropy alloy aerogel can be used for preparing the high-entropy alloy aerogel. And excellent electrochemical activity and stability can be presented in an ultra-low overpotential range of-0.2 to + 0.2 V vs.RHE.

The invention belongs to the technical field of water treatment, and discloses an oxygen-containing functional group modified cobalt-based carbon nanotube as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing and stirring functionalized carbon nanotubes, cobalt salt, cyanuric acid, melamine and a solvent, and then performing centrifugal separation, washing and drying to obtain a precursor; calcining the precursor in a protective atmosphere, and then pickling to obtain the oxygen-containing functional group modified cobalt-based carbon nanotube. Cobalt nitrate is used as a cobalt source, cobalt exists in the form of ions, in the calcining process, cobalt is embedded into a carbon nano tube by means of nitrogen of melamine, cobalt monoatoms exist, cobalt clusters are generated, oxygen-containing functional groups and the cobalt clusters have a regulation and control effect on a charge structure of an active center of the cobalt monoatoms, and the oxygen-containing functional groups and the cobalt clusters have a regulation and control effect on the active center of the cobalt monoatoms. The electric charge density of a cobalt monatomic active center is weakened together, and the binding energy to an intermediate OOH is regulated and controlled, so that the material is a 2e--ORR electrocatalyst with high activity and high selectivity.

The invention provides a novel metal organic framework material reinforced carbon dioxide trapping solvent and a preparation method thereof, and relates to the field of gas adsorbents. Comprising the following steps: S1, dissolving nickel salt, cobalt salt and zinc salt in water to obtain a metal salt solution; s2, uniformly mixing 2, 5-dihydroxyterephthalic acid and N, N-dimethylformamide, then adding 1-methylimidazole and ethanol, and uniformly mixing to obtain a ligand solution; s3, mixing the metal salt solution with the ligand solution, adding the mixture into a microwave reactor for reaction, filtering and drying to obtain an organic framework material; and S4, dispersing the organic framework material in deionized water, then adding an organic amine aqueous solution and a silane coupling agent, uniformly stirring, then adding an imidazolium ionic liquid, and carrying out ultrasonic oscillation to obtain the composite material. The carbon dioxide trapping solvent takes a metal organic framework material as a carrier, and the metal organic framework material is functionally modified and is matched with imidazole ionic liquid, so that the adsorption efficiency and the stability of the trapping solvent can be improved.

The invention relates to a flow battery carbon-based electrode and a preparation method and application thereof, and the preparation method comprises the following steps: respectively dissolving cobalt salt and alkali in a polar organic solvent, and uniformly mixing to form a precursor solution; placing a carbon-based material in the precursor solution, and carrying out a hydrothermal reaction to obtain a carbon-based electrode precursor; and performing high-temperature carbonization on the carbon-based electrode precursor in an inert atmosphere, cooling to room temperature after the reaction is completed, and then cleaning and removing impurities from a product to obtain the carbon-based electrode, the polar organic solvent is at least one of formamide, acetonitrile and N, N-dimethylformamide; after cobalt cyanide is deposited on the surface of the carbon-based material, surface etching and nitrogen doping are carried out on the carbon-based material under the high-temperature condition, surface modification of the carbon-based material is achieved, the contact area of the surface of the carbon-based electrode and electrolyte is increased, and the electrochemical performance of the carbon-based electrode is improved.