2411 results about "Electrocatalyst" patented technology

The invention relates to the technical field of high-entropy oxide and electrocatalyst synthesis, in particular to a double-phase hollow high-entropy oxide catalyst and a preparation method and application thereof, the double-phase hollow high-entropy oxide catalyst comprises metal elements and non-metal elements, the metal elements comprise ruthenium, nickel, cobalt, iron, manganese and chromium; the non-metallic element is oxygen; the chemical formula of the double-phase hollow high-entropy oxide catalyst is NiCoFeMnCrRuO. The invention further discloses a preparation method of the catalyst. The double-phase hollow high-entropy oxide catalyst has a multi-shell hollow structure, provides a larger specific surface area and exposes a large number of reaction active sites, so that the double-phase hollow high-entropy oxide catalyst has lower overpotential, higher reaction efficiency and good electrochemical stability; meanwhile, the preparation method of the double-phase hollow high-entropy oxide catalyst is simple in process, low in cost, high in repeatability and suitable for industrial mass production, and has a wide application prospect.

Described are aqueous rechargeable hydrogen batteries operating in the full pH range (e.g., pH: −1 to 15) with potential for electrical grid storage. The pH-universal hydrogen batteries operate with different redox chemistry on the cathodes and reversible hydrogen evolution / oxidation reactions (HER / HOR) on the anode. The reactions can be catalyzed by a highly active ruthenium-based electrocatalyst. The ruthenium-based catalysts exhibit comparable specific activity and superior long-term stability of HER / HOR to that of state-of-the-art Pt / C electrocatalyst in the full pH range. New chemistries for aqueous rechargeable hydrogen batteries are also provided.

The invention discloses a seed layer induced FeCoNiCuMo high-entropy alloy nanocage electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing and reacting iron, cobalt and nickel precursors to prepare a FeCoNi nanocage catalyst as a seed layer; adding copper salt and molybdate into the seed layer solution, carrying out ultrasonic mixing, adding a pH regulator and a reducing agent, carrying out ultrasonic treatment, putting the mixed solution into liquid nitrogen, cooling, carrying out primary nucleation, naturally unfreezing, standing for nucleation, cleaning, and freeze-drying to obtain the high-entropy alloy nanocage electrocatalyst. The catalyst is used for preparing urea through CO2 and NO3 <-> electro-catalysis, can effectively adjust the matching of CO2 and NO3 <-> reaction kinetics, and has extremely high Faraday efficiency and yield for synthesizing urea through C-N coupling.

The invention belongs to the field of catalyst preparation, and provides a preparation method for rapidly synthesizing a self-supporting high-entropy alloy difunctional electrocatalyst through Joule heat. The prepared FeCuRu-coated Ni1Co1-TPA is benefited from rich active sites, and the high conductivity of effective electron transfer and transmission is achieved. The catalyst shows excellent HER and OER catalytic performance under an alkaline condition, and the current density of 500mA cm <-2 > can be realized by only needing overpotentials of 120mV and 350mV, which is superior to those of a standard noble metal catalyst Pt / C and RuO2. In addition, when the composite material is used as a bifunctional electrocatalyst for electrolyzing water, the composite material shows excellent catalytic activity for electrolyzing water. The method has important significance for realizing the social renewable development target and developing clean and sustainable energy resources to replace fossil fuel.

The invention belongs to the technical field of electrocatalyst material preparation, and discloses a long-range disordered localized CoOOH ultrathin nanosheet electrocatalyst as well as a preparation method and application thereof, fluorine-doped cobalt selenide nanobelts prepared by a low-temperature annealing method are used as a base material, and the CoOOH ultrathin nanosheet electrocatalyst is prepared by in-situ reconstruction under an alkaline electrolyzed water anode oxygen evolution reaction condition. In the preparation process of the CoOOH ultrathin nanosheet provided by the invention, lattice cobalt is stabilized in the water electrolysis anode reconstruction process through fluorine ions with strong bonding action with cobalt ions, so that the long-range disordered structure of amorphous CoOOH generated after reconstruction is limited by localization, and the alkaline water electrolysis anode reaction performance is improved. The catalyst has activity and durability obviously superior to those of a commercial ruthenium oxide catalyst in industrial application of anion exchange membrane water electrolysis hydrogen production.

The invention discloses an electrocatalyst for acidic oxygen evolution reaction as well as a preparation method and application of the electrocatalyst, and belongs to the technical field of electrolyzed water. The preparation method of the electrocatalyst for the acidic oxygen evolution reaction comprises the following steps: growing a transition metal oxide on a conductive substrate in situ to obtain a transition metal oxide carrier; the transition metal oxide carrier is subjected to plasma treatment and then placed in a precious metal salt solution for a cation exchange reaction, and the electrocatalyst is obtained. The electrocatalyst prepared by the invention has extremely low initial overpotential (187mV) when a water electrolysis reaction is carried out in a 0.5 M H2SO4 solution, has no obvious performance degradation in a continuous acidic water electrolysis process for 4500h, shows very high operation stability, and has great application potential in the aspects of replacing a commercial RuO2 / IrO2 catalyst and reducing electrode preparation cost and acidic water electrolysis.

The invention discloses a bifunctional CoCu catalyst, a preparation method thereof and application of the bifunctional CoCu catalyst in sulfur and ammonia production. A Cu-doped CoOOH bifunctional electrocatalyst is synthesized on foam cobalt (CF) through an in-situ growth method and is used for a cathode NO3RR and an anode SOR at the same time. In a sulfur oxidation reaction, the cobalt-based catalyst can effectively oxidize sulfur or a compound thereof into a substance with a higher valence state, such as sulfate, so that removal and conversion of sulfur are realized. In addition, due to low cost and environmental friendliness of the catalyst, the catalyst has great application potential in the aspect of electrochemical coupling treatment of sulfur and nitrate pollutants. Therefore, the invention designs a bifunctional electrocatalyst capable of simultaneously exerting the advantages of Cu-based and cobalt-based catalysts, and is expected to realize efficient electrochemical coupling treatment of sulfur and nitrate.

The invention discloses a PPy / NiCo-LDH / NF composite material and a preparation method and application thereof, and belongs to the technical field of electrocatalyst preparation. The PPy / NiCo-LDH / NF composite material provided by the invention comprises a foamed nickel substrate as well as NiCo layered double hydroxides and polypyrrole which are compounded on the foamed nickel substrate, the polypyrrole is compounded on the surface of the NiCo layered double-metal hydroxide. The surface of NiCo layered double hydroxides is induced and modified by polypyrrole, so that the layered double hydroxides are arranged more regularly and densely, efficient mass transfer of electrons is facilitated, an electron transfer interface can be induced, the composite material exposes more catalytic active sites, the electron interaction is enhanced, and the catalytic activity of the composite material is improved. According to the present invention, with the preparation method, the excellent electrocatalytic activity is provided for the HER and the OER in the alkaline medium, and the excellent cycle stability is provided for the HER and the OER in the alkaline medium after the 1000 times of cycle, such that the wide application prospect in the electrocatalytic reaction is provided.

The invention relates to the technical field of electrocatalysis development, in particular to a Co-based two-dimensional coordination polymer electrocatalyst and a preparation method and application thereof. The chemical formula of the Co-based two-dimensional coordination polymer electrocatalyst is {[Co3 (H2O) 4 (5-CMOIA) 2]. 10H2O} n, an X-ray single crystal diffraction test shows that the coordination polymer belongs to a triclinic system and a P-1 space group, and the minimum asymmetric unit of the coordination polymer contains three Co (II) ions, two deprotonated (5-CMOIA) 3-ligands, four coordination water molecules and ten crystal water molecules. The Co-based two-dimensional coordination polymer has relatively high specific surface area and rich active sites, is good in dispersity in a solution, and can be applied to the field of electrocatalysis.

The invention discloses an electrocatalyst material for in-situ production of hydrogen peroxide through oxygen reduction as well as a preparation method and application of the electrocatalyst material, and belongs to the field of organic wastewater treatment. MoS2 / Fe porous conductive particles and a high-molecular polymer are adopted as main components, and ethanedioate and polyacrylamide are combined as a dispersion auxiliary solvent and a pore-forming agent to form a three-dimensional composite conductive catalyst material; through ultralow-temperature freeze drying and microwave radiation technologies, the material structure is optimized, the catalytic reaction active sites are improved, and efficient electrocatalytic oxygen reduction for in-situ production of hydrogen peroxide is realized; the MoS2 / Fe porous conductive particles not only optimize the performance of the catalyst, but also realize high-valued utilization of solid wastes; the electrocatalyst material has excellent conductivity, catalytic activity and organic wastewater degradation capability, is stable in removal effect before and after use, can be repeatedly used for multiple times, reduces the use cost, and provides a wide application prospect for the fields of environmental protection, energy and the like.

Disclosed in the present invention are a biomass-derived graded porous asymmetric coordination monatomic carbon-based electrocatalyst, and a preparation method therefor and the use thereof. The preparation method for the biomass-derived graded porous asymmetric coordination monatomic carbon-based electrocatalyst comprises the following steps: (1) stirring and mixing de-alkalized lignin with a transition metal salt, a nitrogen-containing compound and a template, i.e., magnesium oxide, in a solvent until uniform, so as to obtain a suspension, wherein the transition metal comprises iron and zinc; (2) heating, evaporating and drying off the suspension, so as to obtain a lignin / metal ion / nitrogen-containing compound / template mixed precursor; and (3) subjecting the mixed precursor to high-temperature pyrolysis under the protection of an inert gas, cooling same, and then sequentially washing and drying same, so as to obtain a monatomic carbon-based electrocatalyst. The monatomic carbon-based electrocatalyst provided in the present invention has graded pores of micropores, mesopores and macropores, a surface nanosheet and an asymmetric coordination structure of Fe-N3O at the same time, and can be applied to fuel cells and metal-air cells.

A system for preparing acrylic acid by utilizing carbon dioxide through electro-biological coupling is characterized by comprising an electro-catalysis methanol production unit, a biological fermentation 3-hydracrylic acid production unit, a 3-hydracrylic acid purification unit and an acrylic acid production unit which are connected in sequence, the electro-catalysis methanol production unit is used for carrying out electro-catalysis on hydrogen produced by water through solar electrolysis and carbon dioxide directly captured by air under the action of a ZnO-ZrO2 catalyst to obtain methanol; the unit for producing the 3-hydracrylic acid through biological fermentation takes the methanol obtained by the electrocatalysis unit as a substrate to carry out biological fermentation, and a fermentation product is subjected to gas-liquid separation to obtain fermentation liquor containing the 3-hydracrylic acid; the 3-hydracrylic acid purification unit is used for carrying out solid-liquid separation on the obtained fermentation liquor of the 3-hydracrylic acid and extracting to obtain the 3-hydracrylic acid; the acrylic acid production unit is used for carrying out dehydration reaction on the purified 3-hydracrylic acid to obtain acrylic acid; carbon dioxide is fixed through an electrocatalysis and biological fermentation coupling technology, and the problem that existing fossil-based raw materials are high in dependency degree is solved.

The invention relates to a NiCoW-CoP / Co3O4 (at) NF self-supporting heterostructure catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a CoP-coated NF precursor on foamed nickel through a constant potential electrodeposition method, then carrying out annealing treatment in a muffle furnace, and finally carrying out electrodeposition on NiCoW-LDH to obtain the NiCoW-CoP / Co3O4-coated NF material. According to the preparation method, the microsphere material with the surface covered with the dendritic dendrites is synthesized, and exposure of active sites is increased through the special surface structure of the microsphere material. The compounding of the trimetal hydroxide containing high-valence tungsten and the introduction of oxygen vacancies can effectively enhance the local electron density of oxygen atoms on the surface of the catalyst, thereby enhancing the catalytic performance and seawater corrosion resistance of the material. Compared with the prior art, the method disclosed by the invention is simple to operate and low in cost, and the prepared catalyst has high electrocatalytic activity, relatively low hydrogen evolution overpotential and oxygen evolution overpotential and long-time stability. And the method has important theoretical significance and potential application value for developing a bifunctional electrocatalyst suitable for electrolyzing seawater.

The invention relates to the technical field of electrocatalysts, in particular to a boron-doped ruthenium dioxide hollow fiber catalyst and a preparation method and application thereof. The preparation method comprises the following steps: preparing calcium alginate fibers from sodium alginate as a raw material through a wet spinning process, mixing the calcium alginate fibers with a boric acid solution, washing and drying to obtain boric acid cross-linked calcium alginate fibers, fully mixing the boric acid cross-linked calcium alginate fibers with a ruthenium trichloride solution, drying to obtain a boric acid cross-linked ruthenium alginate fiber precursor, and carrying out pyrolysis treatment to obtain the boric acid cross-linked ruthenium alginate fiber. Ruthenium ions are converted into ruthenium dioxide nano-particles, boric acid cross-linked alginate fibers are converted into hollow fibers, and boron atoms are doped into ruthenium dioxide crystal lattices to form the boron-doped ruthenium dioxide oxygen evolution reaction electrocatalyst. The boron-doped ruthenium dioxide hollow fiber can be used as a proton exchange membrane electrolytic bath and an electrolyzed water catalyst with excellent performance, and has relatively high catalytic activity and good stability. The raw materials are wide in source, expensive equipment is not needed, and large-scale preparation can be performed.

An oxygen evolution reaction electrocatalyst and a method for preparing said oxygen evolution reaction electrocatalyst are disclosed. The method comprises the steps of contacting a porous zeolite with a solution containing a noble metal precursor to form a noble metal doped zeolite, pyrolyzing the noble metal doped zeolite to form nanocrystals comprising at least the noble metal and a second metal, said nanocrystals being confined within a layer of carbon-based material, wherein the second metal and the carbon-based material are derived from the pyrolyzed zeolite, and annealing said layer of carbon-based material confined nanocrystals to form isolated noble metal atoms singly dispersed within a metal oxide lattice of the second metal as an oxygen evolution reaction electrocatalyst.

The invention belongs to the technical field of electrocatalysis, and particularly relates to a preparation method of a nickel-iron-based transition metal boride / black phosphorus composite oxygen evolution reaction electrocatalyst. The invention provides a preparation method of a ferronickel-based transition metal boride / black phosphorus composite oxygen evolution reaction electrocatalyst, which is characterized by comprising the following steps: synthesizing a quasi-two-dimensional ethylenediamine modified black phosphorus nanosheet (eda-BP) by a hydrothermal method, and carrying out ultrasonic treatment on the surface of the obtained eda-BP to obtain the ferronickel-based transition metal boride / black phosphorus composite oxygen evolution reaction electrocatalyst. The nickel-iron-based transition metal boride / black phosphorus composite oxygen evolution reaction (OER) electrocatalyst (Ni < x > FeyB / eda-BP) is prepared by loading nickel-iron-based transition metal boride (Ni < x > FeyB) through an in-situ chemical reduction method, so that modification of a two-dimensional black phosphorus electrocatalyst is realized; the problems of instability of a quasi-two-dimensional black phosphorus catalyst, serious Fe loss of a nickel-iron-based catalyst, poor reaction kinetics and the like are solved to a great extent, and under the synergistic effect of the two parts, the electro-catalytic oxygen evolution reaction activity and the electro-catalytic stability of the composite catalyst are remarkably improved. The preparation method of the nickel-iron-based transition metal boride / black phosphorus composite oxygen evolution reaction electrocatalyst provides a new thought and a new way for designing and developing a novel efficient and stable oxygen evolution reaction electrocatalyst.

The invention discloses a method for preparing an iron-nickel-molybdenum-based electrocatalyst through combination of electrodeposition and rapid Joule heat and application of the method. The method comprises the steps that S1, a porous nickel substrate is pretreated, and the pretreated porous nickel substrate is obtained; s2, obtaining a nickel salt solution, a molybdenum salt solution and a ferric salt solution; s3, obtaining a mixed solution; s4, putting the mixed solution serving as electrolyte into a dual-electrode electrolytic tank, carrying out electro-deposition treatment by taking the pretreated porous nickel substrate as a cathode and an inert electrode as an anode, and washing and drying to obtain a Fe-Ni-Mo-LDH precursor; and S5, carrying out Joule thermal pyrolysis treatment on the Fe-Ni-Mo-LDH precursor, so as to obtain the iron-nickel-molybdenum based electrocatalyst. The preparation method can effectively regulate and control the size structure of the catalyst, and is suitable for preparing iron-nickel-molybdenum-based electrocatalysts with different substrates and different sizes; and the electrocatalyst has the advantages of uniform and stable nanostructure and high loading capacity. Meanwhile, the preparation method is short in reaction time, high in heating efficiency, high in repeatability and suitable for industrial large-scale production.

The invention discloses a fluorine-nitrogen-doped carbon-based oxygen reduction electrocatalyst for a zinc-air battery and a preparation method of the fluorine-nitrogen-doped carbon-based oxygen reduction electrocatalyst, and belongs to the technical field of catalysts. According to the method, a fluorocarbon mixture is rapidly treated through Joule heat to achieve efficient fluorine doping, then nitrogen doping is conducted through an ammonia gas plasma technology, and therefore an original carbon precursor is converted into fluorine-nitrogen-doped carbon. The catalyst material is short in preparation time and high in production efficiency, the content configuration of fluorine and nitrogen doped in fluorine-nitrogen-doped carbon finally formed by accurately controlling the temperature and time of Joule heat treatment and the power and time of plasma treatment is controllable, the morphology and the pore structure are controllable, high electro-catalytic performance is guaranteed, and the catalyst material is suitable for industrial production. The preparation method is high in production efficiency and low in cost, and has large-scale amplification potential.

The invention discloses a molybdenum-doped iridium-based multicomponent alloy core-shell structure PEM water electrolysis catalyst and a preparation method thereof, relates to the technical field of electrocatalysts, and forms an electrocatalyst material which takes precious metal iridium as a shell and transition metal cobalt and iridium as a core and is doped with transition metal molybdenum in the core shell. As the transition metal molybdenum has good corrosion resistance, the structure can improve the stability of the catalyst, and the transition metal is low in price, so that the cost of the catalyst can be reduced, and the activity among multi-metal catalysts is improved; meanwhile, the performance of the catalyst can be further improved by removing redundant metal on the surface and in the catalyst. The catalyst prepared by the method is high in OER activity, good in stability, low in cost and easy to industrialize, overcomes the defects of existing PEM water electrolysis hydrogen production, and has important value in the field of electrochemical application and practical engineering.

The invention relates to the technical field of new energy materials and devices, and discloses a lithium-sulfur battery difunctional diaphragm and a preparation method thereof, the lithium-sulfur battery difunctional diaphragm comprises a diaphragm substrate and a load slurry, the load slurry is coated on the surface of the diaphragm substrate; the loaded slurry comprises an electrocatalyst material, and the electrocatalyst material is a monatomic catalyst carbon-based material / diatomic catalyst carbon-based material. The monatomic catalyst carbon-based material is a nickel monatomic catalyst carbon-based material or a cobalt monatomic catalyst carbon-based material; the diatomic catalyst carbon-based material is a nickel-cobalt diatomic catalyst carbon-based material. The nickel-cobalt diatomic catalyst coupled carbon-based material is applied to the field of lithium-sulfur batteries and serves as a lithium-sulfur battery diaphragm modification material, sulfur redox kinetics can be promoted, the shuttle effect can be inhibited, lithium ion flux can be induced, so that lithium dendrite growth is inhibited, and finally the cycle performance of the lithium-sulfur batteries is improved.

The invention provides a hydrogen evolution catalysis self-supporting electrode and a preparation method thereof, and belongs to the technical field of electrochemical catalysis. The problems that an existing Pt-based electrocatalyst electrode is high in manufacturing cost, insufficient in durability, weak in corrosion resistance and the like are solved. The preparation method comprises the following steps: firstly, placing a carbon cloth subjected to ultrasonic cleaning and plasma treatment in a metal spraying instrument to deposit a Pt seed crystal layer, and then growing a Pt nanosheet on the carbon cloth through electro-deposition in a mixed solution of sulfuric acid, platinum salt and lauryl sodium sulfate; and cleaning the Pt nanosheet coated carbon cloth with deionized water, and carrying out vacuum drying to obtain the low-Pt-load hydrogen evolution catalytic self-supporting electrode applicable to all pH. The Pt nanosheet is directly grown on the carbon cloth to obtain the hydrogen evolution electro-catalysis electrode, so that the coating of a catalyst and the use of a binder in the conventional preparation process of the electrode are avoided; due to the high porosity of the carbon cloth substrate and the vertical distribution of the Pt nanosheets, the electrode has high specific surface area and excellent charge transfer capacity, and the intrinsic activity and density of catalytic active sites are improved.

Improved electrocatalysts for promoting a hydrogen evolution reaction (HER) or an oxygen evolution reaction (OER) from alkaline fresh water and seawater are disclosed. By incorporating metals, such as tungsten and rare earth elements, into the nickel molybdenum nitride framework, Ni1-xMoxN, the disclosed electrocatalysts demonstrate improved catalytic activity and stability compared to the original Ni&Ni0.2Mo0.8N catalysts, particularly under high-current alkaline conditions, in water electrolysis for hydrogen and oxygen production.

The invention belongs to the technical field of electrocatalytic materials, and relates to a two-phase bimetallic carbide heterostructure electrocatalyst and a preparation method and application thereof. The composition of the two-phase bimetallic carbide heterostructure electrocatalyst is WMoC2 / WVC2, and preferably, the mass percent of the WMoC2 is 40%-80%, and the mass percent of the WVC2 is 20%-60%. According to the invention, the bimetallic heterostructure WMoC2 / WVC2 electro-catalytic hydrogen evolution material is prepared through a step-by-step hydrothermal method and a solid-phase reaction method. The preparation method is green and pollution-free, the raw material cost is low, and the electrocatalytic activity in an alkaline environment is good.

The invention discloses a molybdenum carbide / nitrogen-doped carbon composite material and a preparation method and application thereof, and belongs to the technical field of new energy materials and devices. The preparation method comprises the following steps: uniformly mixing ammonium molybdate, glucose and g-C3N4, and carrying out hydrothermal and high-temperature calcination treatment to obtain a composite material (Mo2C / NC) in which a nano Mo2C electrocatalyst is dispersed and distributed on a nitrogen-doped carbon matrix. The nitrogen-doped carbon in the composite material has a hierarchical porous structure, so that the electrolyte permeation and ion transmission capabilities are enhanced; the nitrogen-doped active sites not only enhance the adsorption performance of the porous carbon on polysulfide, but also improve the catalytic activity by optimizing the coordination structure of Mo2C; mo2C can chemically adsorb and efficiently catalyze reversible conversion of polysulfide, and the utilization rate of active substances is increased. When the composite material is used as a positive electrode additive of a lithium-sulfur battery, dissolution and shuttling of polysulfide can be effectively inhibited, so that the battery has high specific capacity, rate capability and excellent cycle reversibility.

The invention discloses a nitrogen-doped carbon-supported transition metal monatomic material as well as a preparation method and application thereof, and belongs to the technical field of inorganic catalyst materials. The preparation method provided by the invention comprises the following steps: (1) grinding a mixture containing a transition metal precursor, a nitrogen source and a carbon source to obtain an initial mixture; and (2) pyrolyzing the initial mixture in an inert gas atmosphere to obtain the nitrogen-doped carbon-supported transition metal monatomic material. The material provided by the invention can efficiently catalyze carbon dioxide to be reduced into carbon monoxide in a carbon dioxide saturated potassium bicarbonate electrolyte, and the selectivity is higher than 90% or above. The preparation method provided by the invention has universality, is easy for large-scale production, and can be used for synthesizing other similar monatomic materials. The nitrogen-doped carbon-supported transition metal monatomic material prepared by the invention is applied to electrochemical carbon dioxide reduction as an electrocatalyst, and can show excellent catalytic activity, selectivity and stability.

The invention belongs to the related technical field of electrocatalysts, and discloses a cross array electrocatalyst and a preparation method and application thereof.The preparation method comprises the following steps that a nickel net subjected to corrosion treatment is put into a corrosion solution to be subjected to heat preservation reaction for preset time, and then the cross array electrocatalyst is obtained, the electrocatalyst is provided with a nanosheet array structure which is mutually crossed and supported; wherein hydrochloric acid is used for carrying out corrosion treatment on the nickel net; the etchant solution is obtained by dissolving sodium thiosulfate pentahydrate, nickel chloride hexahydrate, ferrous chloride tetrahydrate and sodium orthovanadate in an ethylene glycol solution. The catalyst prepared by the invention has a nanosheet array structure which is mutually supported in a crossed manner, and the special structure enables the catalyst to construct an ion confinement space, so that adsorption and enrichment of reactants on the interface of the catalyst are facilitated, a local reactant-rich environment is constructed, and excellent electro-catalytic oxygen evolution activity is shown.

The invention relates to the technical field of oxygen evolution catalysts, in particular to a preparation method and application of a monatomic doped ferronickel-based oxygen evolution electrocatalyst, and the preparation method comprises the following steps: growing a NiFe-LDH nanosheet substrate on the surface of a carbon-based carrier in situ through a hydrothermal method, and then precisely regulating and controlling transition metal monatomic doping in combination with an electrochemical deposition technology. The monatomic doped ferronickel-based oxygen evolution electrocatalyst prepared by the preparation method has the advantages of excellent catalytic activity, low cost, greenness and no toxicity.

The invention provides a method for regulating and controlling cooling time after Joule heating and a high-entropy oxide electrocatalyst based on the method, and belongs to the technical field of electrocatalytic electrolysis of water. According to the method, the relationship between the graphite substrates with different mass area ratios and the cooling time is determined based on the Newton's law of cooling by carrying out volume segmentation on the graphite substrates; the structure and performance of the high-entropy oxide electrocatalyst are regulated and controlled on the basis of a cooling time regulation and control strategy; the prepared high-entropy oxide electrocatalyst has excellent oxygen evolution reaction catalytic activity in an alkaline environment, the structure of the high-entropy oxide electrocatalyst with the cooling time of 0.3 s is a nanowire assembled by fine nano-particles, the high-entropy oxide electrocatalyst shows the optimal electrochemical performance, and under the current density of 10 mA cm <-2 >, the high-entropy oxide electrocatalyst has excellent oxygen evolution reaction catalytic activity. And the overpotential is only 219 mV. The method provided by the invention is simple and efficient, and can be widely applied to preparation and performance optimization of the electrocatalyst.

The present disclosure includes mixed metal catalysts, including electrocatalysts, which can be applied to reduce the need for Ir, while exhibiting desirable performance. Mixed metal electrocatalyst materials on the invention catalysts comprising Ir, Ru and Pd, catalysts comprising Ru and Pd, and catalysts comprising Ir and Pd.

The invention discloses a method for synthesizing hydrogen peroxide through high-efficiency electro-catalysis oxygen reduction, which comprises the following steps: in an electro-catalysis system, ZnS is loaded on an atomic catalyst Co-NC to form a heterogeneous interface ZnS / Co-NC as an electro-catalyst for synthesizing hydrogen peroxide through oxygen reduction, and ZnS / Co-NC regulates and controls the 3d orbital electron spin state of an active site of monatomic Co-NC to synthesize hydrogen peroxide. Therefore, an oxygen reduction path is converted from a four-electron reduction path to two-electron oxygen reduction to produce hydrogen peroxide; wherein ZnS redistributes charges on a monatomic C carrier and adjusts the spin state of Co < 2 + >, so that the activity of an oxygen reduction process is ensured, a two-electron reaction process is ensured to be a leading process in a reaction process, and high-selectivity and high-activity conversion of oxygen into an ideal H2O2 product can be effectively promoted.