78 results about "Faraday efficiency" patented technology

This invention discloses a barium titanate composite cuprous oxide catalyst, its preparation method, and its application, belonging to the field of catalyst preparation technology. The preparation method of the barium titanate composite cuprous oxide catalyst includes: mixing BaTiO3 and Cu2O cubes at a mass ratio of 1:(0.1~0.4), adding them to an ethanol-water solution for composite formation, followed by filtration, washing, and vacuum drying. The composite catalyst is a heterostructure formed by BaTiO3 nanoparticles attached to the surface of Cu2O cubes. During the electrocatalytic reaction, simultaneous application of ultrasound results in a synergistic effect between the piezoelectric potential generated by BaTiO3 and the catalytic activity of Cu2O, which can efficiently promote nitrate adsorption activation and ammonia generation. Compared with existing technologies, this invention is the first to apply the piezoelectric-electrocatalytic synergistic mechanism to the field of electrocatalytic reduction of nitrogen-containing compounds, achieving an ammonia yield as high as 3370.38 μg·h⁻¹. ‑1 ·mg ‑1 With its excellent performance of 70.54% Faraday efficiency and simple, controllable, and low-cost preparation process, it provides a new route for the green synthesis of ammonia and has important industrial application prospects.

The application discloses a kind of foam nickel supported copper-cobalt bimetallic composite catalyst and preparation method and application, belong to electrocatalytic material technical field.CuSO4·5H2O, CoSO4·7H2O and C6H5Na3O7 are mixed and using constant voltage deposition method is loaded on foam nickel substrate, and CuCo / NF precursor is obtained, and copper-cobalt bimetallic composite catalyst Cu x O-Co3O4 / NF with excellent catalytic activity and stability is successfully prepared by temperature programmed calcination.The application significantly enhances the adsorption capacity of nitrate molecules on the catalyst surface by utilizing the synergistic effect of Cu and Co, reducing the incidence of side reactions, thereby improving the catalytic efficiency of nitrate reduction reaction.Compared with traditional single catalyst, it shows higher ammonia yield, Faraday efficiency (FE) and better stability, and has broad application prospect.

The application discloses a preparation method of a high-selectivity hydrogen peroxide production catalytic electrode, and the method comprises the following steps: (1) dissolving a soluble copper salt and a soluble zinc salt in water to prepare a mixed precursor solution containing Cu2+ and Zn2+ with different proportions; (2) adding a precipitant solution to the mixed precursor solution obtained in the step (1) under stirring, controlling the pH range of the reaction system, regulating the local coordination environment, the local electronic structure, especially the microenvironment of the lattice hydroxyl of the basic copper carbonate, and making the system generate a zinc-modified basic copper carbonate precipitate through aging crystallization, and then performing solid-liquid separation, washing and drying treatment to obtain a zinc-modified basic copper carbonate material; and (3) dispersing the zinc-modified basic copper carbonate material obtained in the step (2) into a solvent to form a catalyst slurry, and loading the catalyst slurry on the surface of a conductive substrate, and then performing drying to obtain a supported zinc-modified basic copper carbonate catalytic electrode. The reasonable lattice hydroxyl structure of the obtained material can be used for electrochemical oxidation of water to prepare hydrogen peroxide in a sulfate electrolyte system, and the material has good hydrogen peroxide production capacity and faradic efficiency.

A system and method are disclosed for increasing the production yield of CO2 conversion products in an electrochemical reactor assisted by an osmotically driven dewatering system. The system comprises an electrochemical cell including a cathode chamber, an anode chamber, and a central desalination chamber. The cathode chamber includes a cathode active material, and the anode chamber includes an anode active material. The central desalination chamber comprises a plurality of desalination cells, each featuring alternating anion exchange membranes (AEMs) and cation exchange membranes (CEMs). A forward osmosis membrane (FOM) is integrated at the interface between the cathode chamber and the adjacent desalination cell, replacing the conventional terminal CEM. This configuration establishes an osmotic gradient that drives water flux from the cathode chamber into the desalination chamber, thereby concentrating the CO2 conversion product (e.g., formate) in situ and enhancing Faradaic efficiency without requiring post-treatment.

The application provides a nanofiber membrane for CO2 reduction and a preparation method and application thereof, and belongs to the field of electrocatalytic reduction of CO2. The nanofiber membrane has a porous structure, the average pore diameter of the nanofiber membrane is 1.8-2.5 mu m, the porosity is 42%-50%, and the thickness of the nanofiber membrane is 20-60 mu m. The nanofiber membrane is a three-dimensional network structure built by a plurality of extremely fine fibers and full of nanoscale pores, and can significantly improve the ethylene Faraday efficiency and product selectivity in the process of electro-reduction of CO2. The application further provides a preparation method of the nanofiber membrane, the porous nanofiber membrane is obtained by using natural cellulose, by a mechanical dissociation method and by optimizing the membrane thickness and the interface microenvironment, and has good ion conductivity and gas barrier capacity, and the ethylene Faraday efficiency of the nanofiber membrane is more than 70% at 700 mA cm ‑2 , which is more than 10% higher than that of a traditional anion exchange membrane system.

This invention discloses a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid, its preparation method, and its application. The preparation method includes: S1, pretreating nickel foam (NF); S2, dissolving disodium hydrogen phosphate dodecahydrate and hexadecyltrimethylammonium bromide in a mixture of water and ethylene glycol, adding cobalt nitrate and stirring to obtain a precursor; S3, immersing the nickel foam in the precursor solution and refrigerating it overnight at low temperature; S4, transferring it to a reaction vessel and hydrothermally heating it at 160 °C for 10 hours to obtain cobalt phosphate (CoPO / NF); S5, using CoPO / NF as the working electrode, electrochemically depositing platinum in an H2PtCl6 and KOH electrolyte using cyclic voltammetry; S6, washing and vacuum drying to obtain the final product. This invention is the first to prepare a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid at 100 mA cm⁻¹. ‑2 With a working potential of only 0.67 V at current density (relative to RHE) and a Faraday efficiency of 100% for glycolic acid, it has significant advantages and application potential in the highly selective production of glycolic acid in the electro-oxidation reaction of ethylene glycol.

The application belongs to the field of urea catalytic preparation, and particularly relates to an electrode for electrocatalytic synthesis of urea and a preparation method and application thereof. The preparation method of the electrode for electrocatalytic synthesis of urea comprises the following steps: performing solvothermal treatment on a mixed solution containing graphene oxide, a water-soluble copper source and a water-soluble bismuth source to realize reduction of the graphene oxide and loading of a Bi2O3 / Cu2O composite heterojunction, thereby obtaining a Bi2O3 / Cu2O-rGO active material; compounding the Bi2O3 / Cu2O-rGO active material on a current collector to form a precursor electrode; and performing electro-reduction on the precursor electrode in a modified electrolyte to obtain the electrode; the modified electrolyte is an aqueous solution of a water-soluble carbonate and a nitrate; and the potential of the electro-reduction is -0.4 to -0.7 V. The electrode has excellent urea catalytic performance, the Faraday efficiency of which can reach 45%, and the yield can reach 550 µg h ‑1 mg cat ‑1 .

The application provides an electrochemical synthesis method of glycine, improves catalytic activity of nitrate reduction and C-N coupling process through atom-dispersed Co-N active sites, and improves mass transfer efficiency through ordered mesoporous structure, thereby relieving the problem of limited substrate diffusion in the reaction process, so that higher glycine Faraday efficiency and yield can be obtained; through taking cobalt acetate tetrahydrate, 1,10-phenanthroline and magnesium hydroxide as raw materials, and sequentially performing reflux coordination, high-temperature pyrolysis and acid washing template treatment, uniform anchoring and atomic-level dispersion of cobalt species in the carbon skeleton can be realized, agglomeration of cobalt particles in the heat treatment process is avoided, and therefore the utilization rate and catalytic activity of cobalt active sites are significantly improved. Meanwhile, the magnesium hydroxide as a template material is removed in the subsequent acid washing process, and rich mesoporous structure can be formed in the catalyst, which is beneficial to rapid diffusion and mass transfer of reactants, intermediates and products, and diffusion limitation in the reaction process is relieved.

This invention discloses a gas-liquid split-flow micro / nano porous electrode device, comprising a U-shaped hollow substrate and a multi-level micro / nano pore directional flow channel system disposed on its wall. The directional flow channel system is divided into a nitrogen transport channel group on the inner wall side and an electrolyte transport channel group on the outer wall side. Both groups of channels are composed of several micropore arrays arranged in a staggered manner along the substrate wall thickness direction. The nitrogen transport channel group adopts a gradually expanding structure, allowing nitrogen to enter from the small-diameter end on the N2 main inlet pressure stabilizing chamber side and exit from the large-diameter end on the inner wall catalyst layer side, achieving directional enrichment and efficient transport of nitrogen. The electrolyte transport channel group adopts a gradually contracting structure, allowing the electrolyte to enter from the large-diameter end on the external environment side and exit from the small-diameter end on the inner wall catalyst layer side, suppressing excessive proton transport to the catalyst layer interface. This invention, through spatial isolation and independent control, simultaneously solves the problems of limited nitrogen mass transfer and severe hydrogen evolution side reactions in traditional electrodes, significantly improving ammonia yield and Faraday efficiency.

This invention relates to an electrochemically driven bipolar hydrogenation system and method, and its application, belonging to the field of electrochemical technology. The electrochemically driven bipolar hydrogenation system includes an anion exchange membrane, a cathode chamber and an anode chamber, a cathode and an anode, a cathode hydrogenation chamber separated from the cathode chamber by the cathode, an anode hydrogenation chamber separated from the anode chamber by the anode, cathode electrolyte and anolyte respectively filling the cathode chamber and the anode chamber, an organic solution to be hydrogenated filling the cathode hydrogenation chamber and the anode hydrogenation chamber, and a clamping plate; both the cathode and anode are Pd membrane electrodes. This invention utilizes a palladium membrane to physically isolate the electrochemical chamber and the hydrogenation chamber, allowing the use of water as a hydrogen source, thereby eliminating the need for hydrogen gas and solving the problem of difficult separation of complex products; the dual hydrogenation system can simultaneously carry out hydrogenation reactions at the cathode and anode, improving the efficiency and Faraday efficiency of organic hydrogenation.

This invention discloses a PdCu intermetallic compound catalyst, its preparation method, and its application, belonging to the field of electrochemical ammonia synthesis and catalyst preparation technology. The preparation method includes: dispersing palladium acetylacetonate, copper acetylacetonate, glucose monohydrate, a surfactant, and a carbon support in an oleylamine solvent to obtain a mixture; subjecting the mixture to ultrasonic treatment to form a uniform dispersion; subjecting the dispersion to an oil bath reaction; collecting the reaction product, washing, and drying to obtain a PdCu intermetallic compound catalyst supported on a carbon support. The catalyst of this invention achieves approximately 224.25 mgh in the electrocatalytic reduction of nitrate to ammonia under alkaline conditions at -1.3V (vs. RHE). ‑1 mg ‑1 The ammonia yield is high, with a Faraday efficiency of 93.48%. Furthermore, this catalyst can be used as a cathode in zinc-nitrate batteries, achieving both power output and ammonia synthesis, demonstrating promising application prospects.

This invention relates to the field of electrochemical catalytic materials technology, and discloses a high-performance electrode catalytic material and its preparation method. The material has a hierarchical porous core-shell structure, composed of a Cu-Ni-Co ternary alloy core, an N-S-P co-doped carbon transition layer, and an Fe-Mn dual-doped oxide shell in a specific ratio. The preparation employs a stepwise hydrothermal-calcination method, which is mild, environmentally friendly, and easily scalable. This material is adaptable to acidic and alkaline electrolysis environments and exhibits excellent HER, OER, and [other properties not specified in the original text]. CO2 Reduction catalytic activity, C2+ With a Faraday efficiency of ≥85.3% and an activity decay of ≤4.2% after 1000 hours of continuous catalysis, it is low in cost, highly stable, and suitable for various scenarios such as water electrolysis for hydrogen production and fuel cells, showing great potential for industrial application.

The invention discloses a preparation method and application of a Bi / SnO2 difunctional electrocatalyst, and the preparation method comprises the following steps: providing a reduction environment by using the combined action of polyvinylpyrrolidone and ethylene glycol, reducing sodium bismuthate into spherical elemental Bi with a regular shape by a hydrothermal synthesis method, and then combining the spherical elemental Bi with SnO2 through rapid centrifugation and vacuum heating to obtain the BiSnO2 difunctional electrocatalyst. Thus, the Bi / SnO2 bifunctional catalyst is obtained. The path of hydrothermal synthesis of the bismuth elementary substance is optimized, the two catalyst materials are tightly combined through heating treatment on the basis, reaction active sites are increased, the obtained catalyst is stable in structure, the catalytic performance is obviously improved, formic acid preparation through electro-catalysis can be promoted at the same time on the cathode and the anode, high selectivity and Faraday efficiency are achieved, and the method is suitable for industrial production. And the original morphology is still maintained after long-time working.

Described herein are electrochemical methods for producing ammonia. In one aspect, the methods involve introducing nitrogen gas at a pressure higher than ambient pressure into an electrochemical cell comprising an electrolyte composition and applying a current to the electrochemical cell to convert the nitrogen gas to ammonia. In one aspect, the electrolyte composition comprises (i) an organic solvent, (ii) a proton donor, and (iii) a salt of lithium, calcium, magnesium, strontium, yttrium, scandium, zirconium, or any combination thereof. The methods described herein provide increased Faraday efficiency (FE) of ammonia while using less energy (i.e., applied current).

This invention provides a method for preparing, a product of, and the application of rose-shaped basic copper nitrate Cu4(NO3)2(OH)6. The preparation method employs a polyol-mediated process, followed by centrifugation to separate nanoparticles from the solvent, and drying to obtain basic copper nitrate Cu4(NO3)2(OH)6. This preparation process is simple, the reaction conditions are mild, and the product quality is highly controllable, making it suitable for industrial production. The Cu4(NO3)2(OH)6 prepared by this method exhibits a unique rose-shaped three-dimensional hierarchical porous structure. Its large specific surface area and open framework facilitate mass transfer of reactants; simultaneously, its abundant pores enable high-density exposure of active sites and the construction of a confined reaction microenvironment. This catalyst exhibits excellent C2 content in the electrocatalytic CO2 reduction reaction. 2+ It exhibits high product selectivity with a Faraday efficiency of up to 76.7%, while effectively suppressing competitive hydrogen evolution reactions and reducing the formation of hydrogen byproducts.

This invention discloses a method for the electrocatalytic reduction of carbon dioxide to solid carbon using gallium-based liquid metal. The method employs a composite working electrode, using a platinum sheet electrode as the counter electrode and an Ag / AgCl electrode as the reference electrode. Solid carbon is prepared through an electrocatalytic reduction reaction in an organic electrolyte continuously purged with carbon dioxide until saturation. The composite working electrode is prepared as follows: using a copper sheet as a substrate, gallium-based liquid metal is treated with dilute hydrochloric acid to remove its surface oxide film, and then capillary action is used to uniformly coat the copper sheet surface. The gallium-based liquid metal is prepared by: mixing gallium, indium, and tin in a specific ratio and heating to obtain a gallium-indium-tin alloy; subsequently, under an inert atmosphere, vanadium powder is ground and mixed with the alloy to achieve uniform vanadium doping, forming more active sites, thereby significantly promoting the generation of solid carbon and effectively improving its Faraday efficiency, thus improving catalytic performance.

The application relates to the technical field of electrochemical catalysis, and particularly discloses a preparation method of a cobalt-based catalyst for electrocatalytic synthesis of ammonia from nitrate. In the method, melamine is placed in the upstream of ZIF-67 powder, and two-step programmed temperature pyrolysis treatment is carried out under a high-purity nitrogen protection atmosphere. After natural cooling, a cobalt-based catalyst with rhombic carbon as a substrate and Co-NC nanoparticles anchored thereon is obtained. Nitrogen atoms in the prepared catalyst are doped on the surface of cobalt clusters to form Co-NC sites, the local electronic structure of cobalt can be accurately controlled, and the Faraday efficiency and yield of electrocatalytic reduction of nitrate to synthesize ammonia can be effectively improved.

The application provides a method for efficiently synthesizing formaldehyde by electrocatalysis of carbon monoxide, and the core is: first, a phthalocyanine cobalt molecular material is used as an electrocatalyst for selectively preparing formaldehyde, the material has a clear C1 selective formaldehyde generation path, and can essentially inhibit the undesired C-C coupling of intermediates; second, the reaction is carried out under high carbon monoxide pressure to enhance the competitive adsorption effect of carbon monoxide. The application proposes a carbon monoxide competitive adsorption strategy, which combines the intrinsic substituent regulation of phthalocyanine cobalt molecular materials and external carbon monoxide pressurization to inhibit the over-reduction of formaldehyde, detach the formaldehyde intermediate from the active site, and realize the selective electro-synthesis. The CoPc-OMe MDE optimized by the application realizes 98% CO-to-HCHO selectivity under 90 bar carbon monoxide, the peak Faraday efficiency is 72%, and the formaldehyde partial current density is more than 110 mA·cm ‑2 .

The present application provides a kind of high C 2+ The application discloses a preparation method, product and application of a selective carbon dioxide electro-reduction catalyst Ag / AgBr / Cu2O. The preparation method adopts a one-pot solvothermal reduction method, and by controlling the reaction conditions, silver species is synchronously generated in the form of metallic silver and silver bromide and firmly combined with a cuprous oxide substrate. The method route is simple, the reaction conditions are mild, and the product is controllable. When the obtained catalyst is applied to a carbon dioxide electro-reduction reaction, the introduction of Ag and the doping of Br in the catalyst produce a synergistic catalytic effect, effectively promote the C-C coupling path, and significantly improve the C 2+ product selectivity, the C 2+ product faraday efficiency reaches 82.7%, and the local current density reaches 121.7 mA·cm ‑2 -2. At the same time, the hydrogen evolution side reaction is effectively inhibited. The research provides a new idea for designing a high-performance CO2 conversion catalyst, and has important scientific value and industrial application potential.

The application belongs to the technical field of chemical synthesis, and particularly relates to Pd4S / PVEIB / PPy / GO nanomaterial, a modified electrode thereof and application. The Pd4S / PVEIB / PPy / GO nanomaterial is composed of poly-1-vinyl-3-ethyl imidazole bromide functionalized polypyrrole / graphene oxide carrier and Pd4S particles, and the core is Pd4S intermetallic sulfide phase. Air is used as a reaction gas, and electrochemical nitrogen oxide is used to prepare nitrate in an alkaline electrolyte. Experiments show that, at 1.77 V relative to a reversible hydrogen electrode, the yield and Faraday efficiency of nitrate in an air atmosphere are twice those in a nitrogen atmosphere, and are very stable. The material has mild preparation conditions, and provides a new technical route with high activity and high selectivity for direct air electrocatalytic synthesis of nitrate.

The application belongs to the technical field of electrocatalytic materials, and particularly relates to a cation exchange type high-entropy layered hydroxide bifunctional electrocatalyst as well as a preparation method and application thereof. The high-entropy layered hydroxide bifunctional electrocatalyst is synthesized through a hydrothermal method and an electric field driven cation exchange strategy, and the obtained catalyst exhibits excellent conversion rate, selectivity and Faraday efficiency in the electrocatalytic oxidation of 5-hydroxymethylfurfural to prepare 2,5-furan dicarboxylic acid, and also exhibits high Faraday efficiency in the electrocatalytic reduction of nitrate to prepare ammonia. An oxidation coupling reduction all-electrolysis system constructed by the catalyst has excellent Faraday efficiency at both poles, and can realize simultaneous and efficient production of biomass value-added at the anode and pollutant resourceization at the cathode. The application provides a new reference approach for precise construction of high-entropy materials and bifunctional electrocatalytic application, and has wide application prospects in the fields of biomass conversion, environmental governance and green electro-synthesis.

This application discloses a method for preparing a porous carbon / hydrophobic carbon paper electrode based on paulownia leaves and its application in water decomposition to produce H2O2, belonging to the field of electrochemical synthesis technology. The method uses waste paulownia leaves as a precursor, which are pretreated and calcined at high temperature under a protective atmosphere to obtain raw biochar. This raw biochar is then activated with KOH to obtain paulownia leaf-based porous biochar. This biochar is then mixed with a perfluorinated resin solution and anhydrous ethanol to prepare a catalyst dispersion, which is drop-coated onto a hydrophobic carbon paper substrate containing 20%–80% polytetrafluoroethylene (PTFE) and dried to obtain a composite electrode. This electrode uses hydrophobic carbon paper as a substrate, with a layered porous structure of paulownia leaf-based porous biochar loaded on its surface, exhibiting a specific surface area ≥600 m². 2 / g、I D / I G The value is 0.85~1.05. Using this electrode in a potassium carbonate electrolyte, a two-electron water oxidation reaction with a voltage of 1.5~4V vs. RHE can efficiently synthesize hydrogen peroxide, with an optimal yield of 43.48 mg / L and a Faraday efficiency of 25.32%. This application utilizes green and inexpensive raw materials and a simple process, achieving high-value utilization of biomass waste and providing a reliable solution for the green industrial production of hydrogen peroxide.

The application discloses a synthesis method of a low-crystalline layered double hydroxide catalyst for electrocatalytic oxidation of HMF under low alkalinity conditions. The method comprises the following steps: (1) pretreating a foamed copper to obtain copper oxide nanowires; and (2) uniformly dropping and coating a mixed methanol solution containing high-concentration nickel salt, iron salt and manganese salt on the surface of the copper oxide substrate, and then reacting in a high-concentration alkaline solution by a non-equilibrium precipitation method to obtain the low-crystalline layered double hydroxide catalyst. The catalyst has rich adsorption sites and catalytic active sites, and can promote efficient conversion of HMF under a low alkalinity environment. The conversion rate of 20 mM HMF in 0.1 M KOH electrolyte is 100%, the FDCA selectivity is 93.80%, and the Faraday efficiency is 92.82%. The method effectively solves the problem that HMF is prone to degradation under high alkalinity conditions, and significantly reduces the amount of acid in the subsequent purification process, thereby reducing the production cost.

The present application relates to the technical field of electrocatalytic materials, in particular to a heterogeneous structure catalyst for reducing nitrate and a preparation method and application thereof, the catalyst comprises a porous graphite carbon carrier and a heterogeneous structure formed by iron monatomic atoms and iron nanoclusters supported on the carrier, wherein the iron monatomic atoms and the iron nanoclusters are formed by in-situ pyrolysis of triruthenium dodecacarbonyl precursor on the carbon carrier, realizing synergistic catalysis of different functional sites, thereby improving ammonia yield and Faraday efficiency, and providing a general technical strategy for designing heterogeneous structure active sites to accelerate series electrocatalytic reactions.

This invention discloses a method for preparing and applying a lead-doped copper-based electrocatalyst. The method includes the following steps: mixing an aqueous solution containing trisodium citrate dihydrate with an aqueous solution containing copper sulfate, then adding an aqueous solution of sodium hydroxide to obtain an orange precursor; dissolving the dried orange precursor in a methanol solution of lead nitrate to anchor Pb nanoparticles onto a copper substrate (PbCu2O); and finally pyrolyzing the PbCu2O in a tube furnace to obtain the lead-doped copper-based electrocatalyst. The electrocatalyst for the reduction of carbon monoxide to multi-carbon products obtained by this invention exhibits a Faradaic efficiency of 96.5%, with a Faradaic efficiency of 66.5% for ethanol, and a cycling stability of 100 h.

The application belongs to a gadolinium-doped copper-based bimetallic catalyst and a preparation method thereof, and the application successfully prepares a gadolinium (Gd)-doped copper-based bimetallic catalyst (ED Gd-Cu-TA) by an electrodeposition method regulated by a ligand 2,3-dihydroxybutanedioic acid potassium sodium (TA), and systematically evaluates an electrocatalytic CO2 reduction reaction performance of the ED Gd-Cu-TA in an alkaline flow electrolytic cell. The test results show that the ED Gd-Cu-TA has a high Faraday efficiency (FE) of 83.3% for the product at a potential of-1.4 V vs. RHE. 2+ The Faraday efficiency (FE) of the product is as high as 83.3%. C2+ ​

This invention relates to a method for preparing and applying a polypyrrole-coated indium-based electrocatalyst. The method includes the following steps: adding carbon nanotubes to an N,N-dimethylformamide solution containing indium nitrate, transferring the solution to a high-temperature reactor, and reacting to obtain In₂O₃ / CNT; placing the In₂O₃ / CNT in an aqueous solution containing pyrrole, and then adding ammonium persulfate to react, thereby obtaining the polypyrrole-coated indium-based electrocatalyst. The polypyrrole-coated indium-based electrocatalyst obtained by this invention exhibits excellent electrocatalytic performance in the reduction of carbon dioxide to formic acid, possessing both high Faradaic efficiency and long-term catalytic stability.

The application discloses a kind of ultrasonic-assisted continuous controllable synthesis one-dimensional core-shell structure nanomaterials method.The method is through online dispersion device, maintains silver nanowire feed stable, adopts acoustic transparent coil type micro-flow reactor, and realizes the heterogeneous growth of ZIF67 on the surface of silver nanowire under the action of ultrasonic field.By synergic control of ultrasonic power, flow rate ratio, reaction temperature and residence time, one-dimensional core-shell structure nanomaterials with complete, uniform coating layer can be stably and repeatedly prepared in specific parameter window.The method overcomes the problems of low efficiency, poor controllability and easy settlement and agglomeration of one-dimensional materials in micro-fluidic system, realizes continuous synthesis with precise and controllable structure and high space-time yield, and the obtained fully-coated materials exhibit high faradaic efficiency and selectivity in the field of electrocatalytic nitrate reduction to ammonia due to their complete and uniform core-shell structure, which verifies the advantages of the method in preparing high-performance catalytic materials.