37 results about "Cobalt oxyhydroxide" patented technology

A cholesterol oxidase-loaded biological material is a nanometer material and is characterized by comprising polyacrylic acid, cobalt oxyhydroxide and cholesterol oxidase, cobalt oxyhydroxide is adsorbed on polyacrylic acid to form a compound, and cholesterol oxidase is loaded on the compound. The size of the nano-biological material is about 100-150 nm, the nano-biological material is combined with ultrasound to obtain multiple nano-enzyme activities with enhanced effects and more excellent capabilities of generating active oxygen and relieving hypoxia, and a lipid raft structure on a cell membrane is damaged by the loaded cholesterol oxidase, so that cell migration is inhibited, and the effect of resisting tumor metastasis is achieved.

The invention provides spherical cobaltosic oxide as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) injecting a cobalt salt-containing solution and a carbonate solution into a base solution in a parallel flow manner for a coprecipitation reaction to obtain a mixed-phase precursor; and (2) calcining the mixed phase precursor to obtain the spherical cobaltosic oxide, wherein the solute of the base solution in the step (1) is alkali metal hydroxide. According to the method disclosed by the invention, the precursor of the hydroxyl cobalt oxide and cobalt carbonate mixed phase can be prepared without separating kettles, the content of foreign ions in the precursor is low, and small-particle and high-purity cobaltosic oxide can be prepared by directly sintering.

The invention discloses a metal monatomic catalyst as well as a preparation method and application thereof, and belongs to the technical field of electro-catalysis. According to the invention, the perovskite strontium cobaltate oxide is doped with metal elements, and the perovskite strontium cobaltate oxide is subjected to hydrothermal treatment in a high-temperature and high-pressure environment so as to be converted into hydroxyl cobalt oxide; the doped metal elements are separated from crystal lattices of the perovskite strontium cobaltate oxide and are anchored on the surface of the formed layered hydroxyl cobalt oxide in a monodisperse manner, so that the monatomic catalyst is prepared; the problems that an existing monatomic catalyst is complex in process and high in cost, and metal monatomic spontaneously gathers are solved, the prepared metal monatomic catalyst has high dispersity and stability, accurate anchoring of the monatomic at a specific active site can be achieved, and the metal monatomic catalyst has wide application prospects in the field of electro-catalysis.

The invention provides a nickel hydroxide material and a preparation method thereof, and relates to the technical field of nickel-metal hydride batteries. The nickel hydroxide material is of a spherical composite structure and sequentially comprises a multi-element doped nickel hydroxide matrix, a hydroxyl cobalt oxide middle layer and an outer lithium modification layer which are arranged from inside to outside, at least one of a zinc element, an aluminum element and a magnesium element is doped in the nickel hydroxide matrix. According to the nickel hydroxide material, through a unique spherical composite structure and a specific element doping strategy, the electrochemical performance and the structural stability of the material are remarkably improved, and the nickel hydroxide material has a wide application prospect in high-performance battery application.

The present invention discloses a preparation method and application of cobalt oxyhydroxide, comprising the following steps: S1: Prepare a cobalt solution and an ammonium bicarbonate solution; S2: Use part of the ammonium bicarbonate solution as the bottom liquid, add the cobalt solution and the ammonium bicarbonate solution to the bottom liquid, and collect the first seed crystal after the reaction; S3: Add the cobalt solution and the ammonium bicarbonate solution to the first seed crystal, collect the second seed crystal after the reaction, repeat the collection of the seed crystal and then add the cobalt solution and the ammonium bicarbonate solution until the D50 of the obtained seed crystal is 17-18 μm; S4: After collecting the seed crystal with a D50 of 17-18 μm, add the cobalt solution and the ammonium bicarbonate solution to react; In the bottom liquid of step S2, the preparation method of cobalt oxyhydroxide of the present invention can shorten the reaction cycle and avoid small particles appearing during the reaction process.

The invention relates to the technical field of electrochemistry, and particularly discloses a preparation method and application of hydroxyl cobalt oxide. Compared with the prior art, the preparation process of the cobalt oxyhydroxide with the large specific surface area is developed through a multi-parameter and surfactant coordinated regulation strategy, and the technical problems that the cobalt oxyhydroxide is not high in specific surface area and obvious in agglomeration phenomenon under the existing synthesis technology are solved; the hydroxyl cobalt oxide prepared by the method has good water electrolysis performance as a water electrolysis oxygen evolution reaction cathode material, and has good charge-discharge performance and cycling stability as a supercapacitor material.

This invention discloses a continuous and efficient method for preparing nano-sized cobalt hydroxyl oxide and cobalt tetroxide, and their applications. The method includes the following steps: (1) adding a cobalt salt solution, an oxidant, and a precipitant to a complexing agent and a solvent, and stirring to obtain a reactant; (2) drying the reactant at 150-160°C to obtain the cobalt hydroxyl oxide; and drying the reactant at 220-230°C to obtain the cobalt tetroxide. Compared with batch production methods, the continuous method of this invention has higher production efficiency, and the prepared cobalt hydroxyl oxide has advantages such as large specific surface area, easy crushing, and small particle size.

The present invention relates to a self-supporting ruthenium / cobalt oxyhydroxide electrocatalyst, a preparation method, and an application thereof. The preparation method comprises: step 1, preparing a self-supporting ultrathin cobalt-based nanosheet precursor by a thermal synthesis method; step 2, using the self-supporting ultrathin cobalt-based nanosheet precursor as a working electrode and preparing a self-supporting ultrathin cobalt oxyhydroxide nanosheet by an anodic oxidation method; and step 3, using the self-supporting ultrathin cobalt oxyhydroxide nanosheet as a working electrode to prepare a self-supporting ruthenium / cobalt oxyhydroxide electrocatalyst, wherein the electrolyte is an aqueous solution containing hydrated ruthenium trichloride. The self-supporting ruthenium / cobalt oxyhydroxide electrocatalyst and preparation method provided by the present invention overcome the problems of low efficiency, high cost, low catalytic activity, poor stability, and difficulty in industrial production.

The invention discloses a cobalt complex pre-catalyst for electrocatalytic oxygen evolution and a preparation method thereof, and relates to the technical field of functional complexes. The structure of the cobalt complex pre-catalyst (CotPBA-anion) is formed by coordination of a cobalt coordination cation unit chelated by tPBA and an anion; the structure of the catalyst is CoOOH / tPBA, and the catalyst is characterized in that the catalyst is cobalt oxyhydroxide loaded by an organic ligand. Wherein the CoOOH / tPBA reconstructed by using the CotPBA-Cl shows the optimal electrochemical activity and stability. The pre-catalyst is simple in preparation process and mild in reaction condition, and shows good electro-catalytic oxygen evolution reaction activity and electrochemical stability after simple reconstruction.

Provided is a nickel-containing hydroxide coated with cobalt, having a coating layer containing cobalt oxyhydroxide formed on a nickel-containing hydroxide, in which an average circularity of particles having particle diameters equal to or more than a particle diameter at a cumulative volume percentage of 50% (D50) within a range of 0.900 or more and 0.990 or less.

The invention belongs to the technical field of degradation of organic pollutants, and particularly relates to zinc-doped hydroxyl cobalt oxide as well as a preparation method and application thereof. The zinc-doped hydroxyl cobalt oxide provided by the invention comprises a cobalt element and a zinc element in a molar ratio of (0.1-10): 1; the zinc-doped hydroxyl cobalt oxide contains oxygen vacancies, and the concentration of the oxygen vacancies is 25-85%; the specific surface area of the zinc-doped hydroxyl cobalt oxide is 180-280 m < 2 > / g; the zinc-doped hydroxyl cobalt oxide has a pore structure, the pore diameter is 5-9 nm, and the pore volume is 0.4-0.7 cm < 3 > / g. According to the zinc-doped cobalt oxyhydroxide, cobalt oxyhydroxide serves as a base body, the crystal structure of the zinc-doped cobalt oxyhydroxide is regulated and controlled through doping of the zinc element, the exposure degree of active sites of the zinc-doped cobalt oxyhydroxide is effectively controlled and adjusted, the concentration of oxygen vacancies (OV) with the strong redox characteristic is regulated and controlled, and then the catalytic activity of the zinc-doped cobalt oxyhydroxide is optimized.

The invention discloses doped large-particle hydroxyl cobalt oxide as well as a preparation method and application thereof. The preparation method of the doped large-particle cobalt oxyhydroxide comprises the following steps: dissolving cobalt salt and doped metal salt in water to prepare a mixed salt solution; under the stirring condition, the mixed salt solution and the precipitator solution are added into a reactor in a parallel flow mode, the pH of a reaction system is controlled to be 8.0-11.0, the temperature is controlled to be 40-70 DEG C, aging is carried out after charging is completed, a co-precipitation reaction is carried out, and doped precursor slurry is obtained; and adding an oxidizing agent into the doped precursor slurry, carrying out oxidation reaction at 60-95 DEG C, and filtering, washing and drying the product after the reaction is finished. The hydroxyl cobalt oxide prepared by the method is large particles of 10-50 microns, has good fluidity, is easy to be filled in a fixed bed, can be directly used for a flowing type electrolytic tank, and solves the engineering application problem of nano powder.

The invention provides a method for high-valued utilization of a positive electrode material of a waste lithium cobalt oxide battery, and belongs to the technical field of cyclic utilization of positive electrode materials of waste batteries. The lithium cobalt oxide powder in the positive electrode material of the waste lithium cobalt oxide battery is subjected to acid leaching to obtain the cobalt-containing leaching solution, then the cobalt-containing leaching solution is directly subjected to hydrothermal reaction with urea and ammonium fluoride to obtain the intermediate, the intermediate reacts with the oxidizing agent to obtain the hydroxyl cobalt oxide, metal separation steps such as extraction and reverse extraction are not needed, the method is simpler, and the cost is lower. And the prepared hydroxyl cobalt oxide has excellent catalytic performance.

The invention provides a nickel-doped hydroxyl cobalt oxide catalytic electrode as well as a preparation method and application thereof. The nickel-doped cobalt oxyhydroxide catalytic electrode comprises a foamed nickel substrate and nickel-doped cobalt oxyhydroxide uniformly loaded on the surface of the foamed nickel substrate, the molecular formula of the nickel-doped cobalt oxyhydroxide is Ni-CoOOH, and the nickel-doped cobalt oxyhydroxide is of a wrinkled nanosheet structure. The nickel-doped hydroxyl cobalt oxide catalytic electrode is prepared through a two-step method of room-temperature electro-deposition and electrochemical reconstruction, nickel doping is beneficial to regulation and control of the electronic structure of the material, more catalytic active sites can be exposed through the nanosheet morphology, and therefore the dynamic process of catalytic reaction is promoted. The catalytic electrode shows excellent catalytic activity and stability in the aspect of upgrading hydrolysate of polyethylene glycol terephthalate (PET) waste plastics into formate with high added value through electro-catalysis.

The application relates to the technical field of catalysts, and particularly discloses a hydrogenation catalyst as well as a preparation method and application thereof.A hydrogenation catalyst raw material comprises a carrier component and a catalytic component; the carrier component raw material comprises: 60-80 parts of gamma-alumina; 5-10 parts of titanium carbide; 5-10 parts of hydroxyapatite; 10-15 parts of chelated nanocapsules; 5-10 parts of zirconium oxide; and 3-5 parts of a stabilizer; the catalytic component raw material comprises: 20-30 parts of modified hydroxyl cobalt oxide; 5-10 parts of molybdenum trioxide; and 1-3 parts of rare earth oxide.The modified hydroxyl cobalt oxide is obtained by modifying hydroxyl cobalt oxide with lanthanum nitrate.The hydrogenation catalyst can avoid pollution and poisoning of the catalytic active component by the components such as the rare earth oxide, and realizes long-term stability of the catalytic performance.

The application relates to the technical field of lithium ion batteries, in particular to a nano-hydroxyl cobalt oxide as well as a preparation method and application thereof. The method uses cobalt nitrate hexahydrate as raw material, cooperates with a double-amine system of n-butylamine and n-dodecylamine to limit the growth of nanosheets, controls the ultrathin sheet structure of the nano-hydroxyl cobalt oxide through mild step-by-step sodium hypochlorite oxidation and limited regrowth, further utilizes surface silane grafting and two-stage poly(2-oxazoline) brush layer to realize accurate regulation of the electrode-electrolyte interface of the material, and effectively reduces the interface impedance. The obtained material has high specific surface area, low surface resistance, excellent rate performance and long cycle stability. The application innovatively combines morphology control and interface engineering, improves the electrochemical performance of the material, and provides a new technical route for the research and industrialization of high-performance lithium battery electrode materials.

The present invention belongs to the field of batteries, and in particular relates to a cobalt oxyhydroxide, a preparation method therefor, a positive electrode material, a battery, and an electrical device. The grain size of the cobalt oxyhydroxide provided in the present application at a (003) crystal plane is D(003)=100~290Å, the (003) crystal plane corresponding to a diffraction peak at a diffraction angle 2θ of 19°-21°. The cobalt oxyhydroxide has an appropriate grain size on the (003) crystal plane, helping to improve the crushing effect of the cobalt oxyhydroxide, the dispersion performance and coating performance of the cobalt oxyhydroxide mixed with positive electrode materials, and the cycle performance of batteries prepared from coated and sintered positive electrode materials.

The present application relates to a kind of detection of sweat glucose porous hydrogel film and preparation, detection method, porous hydrogel film includes: carrier, cobalt oxyhydroxide modified rare earth nanoparticles and glucose oxidase;The cobalt oxyhydroxide modified rare earth nanoparticles and the glucose oxidase are distributed in the inside of the carrier;The cobalt oxyhydroxide is coated on the surface of the rare earth nanoparticles to form the cobalt oxyhydroxide modified rare earth nanoparticles;The cobalt oxyhydroxide is used to quench the fluorescence emission of the rare earth nanoparticles;The carrier is formed by polyacrylamide intercrossing.This application detects glucose in sweat by the principle of fluorescence resonance energy transfer, with the advantages of high efficiency and stability, safe and simple to use, the structure of porous hydrogel film is simple, easy to make and low in cost, the detection of sweat glucose is realized by observing the fluorescence intensity of film, and it can also work in dark environment.

The invention discloses a supported annular hydroxyl cobalt oxide carbon dioxide adsorption material and a preparation method and application thereof.During preparation, carbon cloth serves as a working electrode, a carbon rod serves as a counter electrode, electrochemical deposition is carried out in the presence of a reference electrode and an electrolyte, an annular hydroxyl cobalt oxide precursor is generated on the carbon cloth, and the supported annular hydroxyl cobalt oxide carbon dioxide adsorption material is obtained; then, the intermediate is soaked in an alkaline solution, and a carbon dioxide adsorption material is generated; the electrolyte comprises cobalt salt, boric acid and water; the carbon dioxide adsorption material comprises carbon cloth and annular hydroxyl cobalt oxide combined with the carbon cloth; the adsorption material has high specific surface area, multi-effect adsorption site coordination and excellent cycle stability, shows high CO2 adsorption capacity and outstanding cycle retention rate in a normal-temperature environment, and is suitable for high-efficiency trapping of low-concentration CO2 in flue gas in high-emission industries such as electric power and chemical engineering; and a new material path is provided for industrial popularization of a low-cost and high-stability carbon capture technology.

The application discloses an integrated metal electrode and a preparation method and an electrocatalytic synthesis ammonia method, relates to the technical field of electrocatalytic synthesis ammonia, and solves the problems of poor structural and interface stability of the existing electrode under fluctuating power conditions, easy attenuation of ammonia yield and faradic efficiency, and lack of electrode preparation and ammonia synthesis complete technology suitable for fluctuating working conditions. The electrode takes foamed iron, cobalt or nickel as a substrate, and has an active phase in situ grown on the surface; the active phase is ferric oxyhydroxide, cobalt oxyhydroxide or nickel hydroxide. The foamed metal is pretreated, and the foamed metal is subjected to CV circulation in an alkaline electrolyte at 1.4-0.6V in a three-electrode system to obtain the integrated metal electrode. The integrated metal electrode is used as a working electrode, an alkaline solution containing nitrite is used as an electrolyte, and the nitrite is reduced and electrocatalytically synthesized into ammonia under the condition of constant current with fluctuating current density in a three-electrode electrolysis system. The application can be used for electrocatalytic reduction and synthesis of ammonia from nitrite under fluctuating power conditions.

The invention discloses large-particle high-aluminum-doped spherical hydroxyl cobalt oxide, cobaltosic oxide and a preparation method thereof. The preparation method of the large-particle high-aluminum-doped spherical cobalt oxyhydroxide comprises the following steps: preparing a cobalt-aluminum mixed solution, a precipitant solution, a complexing agent solution and a reaction base solution containing a seed crystal; adding the cobalt-aluminum mixed solution, the precipitant solution and the complexing agent solution into the reaction base solution containing the seed crystal in a parallel flow manner, and carrying out a co-precipitation reaction; and after the specified particle size is reached, carrying out solid-liquid separation and drying to obtain the large-particle high-aluminum-doped spherical hydroxyl cobalt oxide. By optimizing coprecipitation process parameters, uniform distribution of the aluminum element is achieved, meanwhile, it is ensured that the product has high tap density, narrow particle size distribution and good sphericity degree, when the obtained material is applied to a high-voltage lithium cobalt oxide positive electrode, the gram volume, cycling stability and high-temperature performance of the high-voltage lithium cobalt oxide positive electrode can be remarkably improved, and the service life of the high-voltage lithium cobalt oxide positive electrode is prolonged. The core pain point of non-uniform doping of a traditional carbonate system is solved.

The application provides a method for rapidly and efficiently preparing small-particle-size aluminum-manganese-doped hydroxyl cobalt oxide, which comprises the following steps: firstly, mixing a cobalt source, an aluminum source, a manganese source, a complexing agent and an oxidizing agent in water to obtain a reaction solution; secondly, under the conditions of a certain stirring speed and reaction temperature, adding the reaction solution into a sodium hydroxide solution, controlling the feeding speed and reaction time to obtain a product; and finally, performing solid-liquid separation, washing, drying and crushing treatment on the product to obtain powder-shaped small-particle-size aluminum-manganese-doped hydroxyl cobalt oxide. The preparation method has the advantages of simple reaction conditions, rapidness and fewer harmful components. The aluminum-manganese co-doped hydroxyl cobalt oxide prepared by the application has a small particle size, is beneficial to further sintering and forming, and the two different metal elements of aluminum and manganese can significantly enhance the material structure stability, so that the application has a wide popularization and application prospect in the preparation of lithium ion battery positive electrode materials.

The invention relates to the technical field of catalysts, and particularly discloses a hydrogenation catalyst and a preparation method and application thereof. The hydrogenation catalyst raw material comprises a carrier component and a catalytic component, the carrier component comprises the following raw materials in parts by weight: 60-80 parts of gamma-aluminum oxide; 5 to 10 parts of titanium carbide; 5 to 10 parts of hydroxyapatite; 10 to 15 parts of a chelated nanocapsule; 5-10 parts of zirconium oxide; 3-5 parts of a stabilizer; the catalytic component is prepared from the following raw materials: 20 to 30 parts of modified hydroxyl cobalt oxide; 5 to 10 parts of molybdenum trioxide; and 1-3 parts of rare earth oxide. The modified cobalt oxyhydroxide is obtained by modifying cobalt oxyhydroxide through lanthanum nitrate. According to the hydrogenation catalyst, pollution and poisoning of catalytic active components can be avoided through the components such as the rare earth oxide, and long-acting stability of catalytic performance is achieved.

The application provides a method for rapidly and efficiently preparing aluminum-magnesium uniformly doped hydroxyl cobalt oxide, which comprises the following steps: adding an aluminum salt and a magnesium salt into a cobalt ion-containing aqueous solution to obtain a first mixed solution; slowly adding hydrogen peroxide into the first mixed solution under rapid stirring to obtain a second mixed solution; adding the second mixed solution and a sodium hydroxide solution into a reaction container in a certain proportion under stirring, and obtaining a product containing a precipitate by controlling feeding time, reaction temperature and reaction time; and finally, obtaining a target product through solid-liquid separation, washing and drying. The aluminum-magnesium uniformly doped hydroxyl cobalt oxide prepared by the method has the advantages of small particle size, high specific surface area, uniform doping and controllable doping amount, etc.; the preparation process is simple and rapid, and the aluminum-magnesium elements can be uniformly doped under the conditions of rapidness and low energy consumption, and the phenomenon of element aggregation is avoided, so that the method has certain popularization and application prospects.

The application discloses a cobalt oxyhydroxide catalyst, a preparation method thereof and a CoOOH / PTFE catalytic membrane, and belongs to the technical field of advanced oxidation water treatment.The CoOOH catalyst is prepared by using CoSO4.7H2O, (NH4)2S2O8 and K2SO4 as raw materials and adopting a hydrothermal method, and has a three-dimensional porous flower ball shape; due to the special morphology of the material, the removal rate of EE2 catalyzed by PMS can be as high as 95% or more, which is 2.39 times of the CoOOH prepared by a conventional precipitation method and 5.96 times of commercial Co3O4; the CoOOH material activated PMS catalyzed EE2 also has wide pH adaptability (pH: 3.0-10.0), cycle stability and low cobalt ion leaching concentration (0.0019 mg / L). In addition, the CoOOH material is loaded on a PTFE membrane by a vacuum filtration technology, a CoOOH / PTFE membrane-PMS system is built, and the system is applied to the continuous degradation of EE2 in actual water bodies, can be continuously treated for 24 hours, and can maintain a removal rate of 92.48%, and has potential practical application value.

The invention provides a continuous aluminum-doped cobalt oxyhydroxide preparation method, which comprises: continuously introducing an aluminum-doped cobalt salt solution mixed with a complexing agent and a precipitating agent into a reaction kettle, continuously introducing air, carrying out a reaction, controlling the temperature, the pH value, the flow rate and the stirring rotation speed of the reaction system, and stopping the reaction when the liquid level reaches an overflow port, continuously overflowing the slurry into an aging tank, carrying out aging treatment, and filtering and drying to obtain aluminum-doped hydroxyl cobalt oxide; the temperature of the reaction system is 60-80 DEG C, and the pH value is 9.8-11.2; the molar ratio of the complexing agent to the aluminum element in the aluminum-doped cobalt salt solution is (0.016-0.032): 1; the molar ratio of the Al element to the Co element in the aluminum-doped cobalt salt solution is (0.05-0.1): 1. By optimizing the technological process and reaction conditions, continuous, stable and efficient production of the aluminum-doped hydroxyl cobalt oxide is realized, and the uniformity, sphericity and tap density of the product are remarkably improved.

The present invention belongs to the technical field of powder metallurgy, and specifically relates to an ultra-coarse tungsten carbide powder, an ultra-coarse grain cemented carbide and a preparation method thereof, wherein cobalt oxyhydroxide powder is mixed with carbon black to prepare a carbon-cobalt composite powder; the carbon-cobalt composite powder is mixed with tungsten powder to prepare a carbon-cobalt-tungsten composite powder; the carbon-cobalt-tungsten composite powder is sintered to prepare a WC agglomerate; the WC agglomerate is ball-milled and graded to prepare an ultra-coarse tungsten carbide powder. The present invention promotes the development and carburization of ultra-coarse single crystal tungsten carbide by doping with cobalt-based powder to prepare an ultra-coarse tungsten carbide powder; the ultra-coarse tungsten carbide powder has a production state FSSS particle size of >31.5μm, and its carburization is complete, the grains are fully developed, and there are few agglomerated pseudo particles, and the WC grain size of the ultra-coarse grain cemented carbide prepared by using the ultra-coarse tungsten carbide powder is >7.5μm, and the organizational structure is uniform, and there is no local decarburization phenomenon.

A composite is provided which comprises planar molybdenum oxide microstructures and cobalt oxyhydroxide microstructures disposed on the planar molybdenum oxide microstructures. A method of forming the composite is also provided. The composite is used in the fabrication of an electrochemical sensor, which comprises the composite, an electrode, and a polymeric coating. The electrochemical sensor is used in a method of detecting the presence of glucose in an analyte. The method involves applying a voltage to the electrochemical sensor relative to a counter electrode and measuring a current response. The method in insensitive to common oxidative interfering analytes such as urea, lactate, and NaCl.

The application discloses an electrochemiluminescence sensor for high-sensitivity detection of bisphenol A and a construction method thereof, and relates to the field of electrochemistry, and comprises the following steps: incubating a D-UiO-66@CsPbBr3 composite material with a first nucleic acid aptamer S1; incubating a CoOOH@Au composite material with gold nanoparticles reduced on the surface of cobalt oxyhydroxide nanosheets with a second nucleic acid aptamer S2 of bisphenol A; based on specific binding between the aptamer and bisphenol A, using the defect type UiO-66 loaded with CsPbBr3 as a base luminous material, and reducing the Au nanoparticles on the surface of the cobalt oxyhydroxide nanosheets as an ECL energy transfer acceptor to quench the ECL signal; when the bisphenol A exists, the specific recognition of the aptamer makes the energy acceptor separate from the electrode surface, so that the ECL signal is recovered; and the electrochemiluminescence sensor constructed through layer-by-layer modification has good reproducibility, high sensitivity and a low detection limit.

The present invention discloses a copper-phosphorus / cobalt foam composite catalyst, a preparation method thereof and an application thereof, belonging to the technical field of catalysts. The preparation method comprises the following steps: S1: obtaining cobalt foam and performing pretreatment on the cobalt foam; S2: performing alkali treatment on the pretreated cobalt foam to obtain a cobalt oxyhydroxide precursor with a double-layer hydroxide structure; S3: preparing a copper plating electrolyte and placing the cobalt oxyhydroxide precursor in the copper plating electrolyte for electrodeposition to obtain a copper / cobalt foam precursor; S4: performing phosphating annealing treatment on the copper / cobalt foam precursor to obtain the copper-phosphorus / cobalt foam composite catalyst. The preparation method of the present invention is simple and low in cost, and the obtained copper-phosphorus / cobalt foam composite catalyst has excellent activity and stability, can be applied to the electrochemical reduction of nitrate to synthesize ammonia reaction, reduces the reaction kinetic potential energy of nitrate reduction to ammonia, and significantly improves the ammonia production efficiency.