1313 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.

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.

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.

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 relates to a catalyst for the hydrogen evolution reaction (HER) and methods for using the catalyst in a water-splitting process. A hydrogen evolution reaction (HER) electrocatalyst, and a method and use for preparing a HER electrocatalyst are disclosed. The method comprises the step of forming a two-dimensional electron gas (2DEG) interface at a heterojunction of at least one of two or more alternating layers of a first complex oxide and a second complex oxide, wherein the or each 2DEG interface exhibits a current density, corresponding to an intrinsic hydrogen evolution reaction (HER) activity that renders the 2DEG interface(s) suitable as an HER electrocatalyst for producing hydrogen (H2) from a water-based electrolyte by water electrolysis.

The invention relates to the technical field of chemical catalysis, and particularly discloses a covalent organic framework material loaded bimetallic monatomic electrocatalyst and a preparation method and application thereof, the catalyst comprises a carrier and atomic-scale dispersed metal diatomic active sites; the atomic-scale dispersed metal diatomic active sites are anchored in the carrier through a simple post-impregnation method; the carrier is a triazinyl covalent organic framework; a coordination structure is formed between the atomic-scale dispersed metal diatomic active sites and the carrier through a nitrogen-metal-chlorine bridging structure; the diatom-dispersed difunctional electrocatalyst has good overall water decomposition performance, under the condition of 1M KOH, the overpotential of hydrogen evolution reaction is 39.3 mV at 10 mA cm <-2 >, the overpotential of oxygen evolution reaction is 251.2 mV at 10 mA cm <-2 >, the synthesis process is simple and easy to implement, the preparation cost is low, and the diatom-dispersed difunctional electrocatalyst has industrial production and application prospects.

The invention belongs to the technical field of catalytic materials, particularly relates to an electrocatalytic anode oxygen evolution reaction catalyst based on an anion exchange membrane electrolytic cell, and particularly relates to a high-entropy oxide electrocatalyst and a preparation method thereof. The high-entropy oxide electrocatalyst is composed of five metal elements of Ni, Co, Fe, Mn and Al, is loaded on a foamed nickel substrate, has a nanosheet structure, is rich in oxygen vacancies on the surface, has excellent electrochemical catalysis performance and stability, and is suitable for electrocatalysis of an electrolytic water anode side in an alkaline environment. According to the preparation method of the high-entropy oxide electrocatalyst, foamed nickel is used as a substrate, salts of five metals of Ni, Co, Fe, Mn and Al which are equal in mole are subjected to hydrothermal synthesis to form a precursor, and then the high-entropy oxide electrocatalyst is prepared through self-etching, annealing oxidation and acid etching, and the high-entropy oxide electrocatalyst is easy and convenient to operate, good in repeatability, controllable in cost, excellent in performance and suitable for large-scale production.

This invention relates to a method for synthesizing iron-cobalt alloy-doped carbon nanofibers for electrocatalysis using zinc oxide etching, belonging to the technical field of electrode materials and catalysts. The preparation method includes the following steps: 1) mixing DMF (dimethylformamide), PMDA (pyromellitic dianhydride), and ODA (4,4-diaminodiphenyl ether) in a certain proportion to prepare a PAA (polyamic acid) spinning solution; 2) preparing PAA nanofibers from the PAA spinning solution using an electrostatic melt-blowing device; 3) imidizing the PAA nanofibers using a programmed temperature rise method to obtain PI nanofibers; 4) impregnating the PI nanofibers in a salt solution; 5) carbonizing the impregnated PI nanofibers with a large number of metal ions on their surface in an inert atmosphere using a certain temperature rise program to obtain iron-cobalt alloy-doped carbon nanofibers. The iron-cobalt alloy-doped carbon nanofibers prepared by this method exhibit excellent performance as an ORR / OER bifunctional electrocatalyst and have wide applications.

The application provides a preparation method of a self-coiled structure molybdenum disulfide / nitrogen-doped porous carbon composite material, a product and application, high-content nitrogen-doped porous carbon material is synthesized by inducing dicyandiamide molecules to undergo a supramolecular self-assembly process, and on this basis, a hydrothermal reaction is carried out to coat molybdenum sulfide sheet layer material on the surface, and finally, a self-heating coiling treatment is carried out to form a carbon-based electrocatalyst of the self-coiled structure molybdenum disulfide / nitrogen-doped porous carbon. Compared with a high specific surface area carbon-based catalyst, high doping concentration of nitrogen atoms can provide more electron-rich properties to facilitate the adsorption of substances, and the self-coiled carbon-based material can exhibit very excellent electrochemical performance, especially in the aspect of electrochemical hydrogen production. The preparation method is simple in operation, low in preparation cost and suitable for large-scale production.

The invention discloses a Ru-Mn2O3 / MnO2 composite material used as an acidic OER electrocatalyst and a preparation method of the Ru-Mn2O3 / MnO2 composite material. The preparation method of the composite material comprises the following steps: calcining prepared MnO2 nano powder as a reaction precursor by using an ultrafast sintering technology to obtain a Mn2O3 / MnO2 composite material; and preparing a uniformly dispersed aqueous solution from the MnO2 and ruthenium chloride hydrate, and obtaining Ru-Mn2O3 / MnO2 by utilizing the principle of electrochemical replacement reaction. The preparation method disclosed by the invention has the advantages of low raw material cost, mild reaction conditions, high reaction rate, energy conservation, environment friendliness and the like; according to the preparation method disclosed by the invention, the Mn2O3 / MnO2 composite material is prepared by regulating and controlling the ultra-fast sintering reaction temperature; the Ru-Mn2O3 / MnO2 composite material prepared by the invention is used as an OER electrocatalyst, has low overpotential in an oxygen evolution reaction under an acidic condition, and shows a good acidic electrocatalytic oxygen production application prospect.

The invention belongs to the technical field of electrocatalysts, and discloses a method for preparing a heterogeneous monomolecular electrocatalyst by using water-soluble metalloporphyrin / phthalocyanine and a carbon carrier and application of the heterogeneous monomolecular electrocatalyst. The method comprises the following steps: 1) dissolving water-soluble metalloporphyrin / phthalocyanine in water to obtain a water-soluble metalloporphyrin / phthalocyanine solution; 2) soaking the electrode coated with the nanoscale carbon material in a water-soluble metalloporphyrin / phthalocyanine solution; or uniformly mixing the carbon nanomaterial organic solvent dispersion liquid with a water-soluble metalloporphyrin / phthalocyanine solution to obtain a composite catalyst; and dispersing the composite catalyst in an organic solvent, uniformly mixing with a binder solution, coating an electrode with the mixture, and drying to obtain the heterogeneous monomolecular electrocatalyst. The method disclosed by the invention is simple, catalyst molecules can be completely dispersed and adsorbed on a nanoscale carbon material in a single molecule form, and active sites are improved; the prepared monomolecular electrocatalyst is used for electrocatalysis of carbon dioxide reduction reaction, and high product selectivity and stability of carbon dioxide reduction can be realized.

The invention relates to a Ni monatomic doped zinc oxide electrocatalyst and application thereof in electrocatalytic synthesis of urea. Ni in the catalyst is anchored to ZnO crystal lattices in a monatomic form to form a Ni-O-Zn atomic-scale interface, Ni-Ni coordination does not exist, and the catalyst is prepared by adopting a hydrothermal method. The catalyst is loaded on a conductive substrate, CO2 and NO3 <-> are synergistically reduced in a CO2 saturated KHCO3 / KNO3 mixed electrolyte to generate urea, the urea yield is 41.38 mmol h <-1 > gcat <-1 > at-0.8 V (vs RHE), and the Faraday efficiency is 31.47%. Compared with Ni nano-particle loaded ZnO and non-doped ZnO, the catalyst has the advantages that the yield and selectivity of urea are remarkably improved, and the catalyst is suitable for efficiently synthesizing urea under mild conditions.

The invention discloses a preparation method and application of a polyindium phthalocyanine oxygen reduction electrocatalyst covalently suspended on a carbon nano pit, polyindium phthalocyanine is anchored on a defective carbon nano tube etched by CO2, and collaborative optimization of InPc electronic structure regulation and metal-carrier electron interaction is realized. Nano-pit defects are generated on the surface of CNT through CO2-driven oxidation etching, rich edge type carbon atoms with unpaired electrons are exposed in the substrate surface of the CNT, meanwhile, a single-layer InPPc polymer is covalently suspended on the carbon nano-pit defects through axial In-C coordination, axial In-C coordination bonds serve as electron bridges, and therefore, the carbon nano-pit defects can be formed in the surface of the CNT through the axial In-C coordination bonds. And strong interface coupling between the In-N4 center and the v-CNT substrate is realized. According to the electrocatalyst prepared by the method, the ORR catalytic activity and stability of the catalyst are remarkably improved.

The invention discloses an OER electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of electrolyzed water. The OER electrocatalyst is a Ni (OH) 2-CoWO4 / Co3W3C-coated CNF heterojunction composite material with a 3D (three-dimensional) structure. According to the preparation method, a CNF nano array is taken as a substrate, and the Ni (OH) 2-CoWO4 / Co3W3C-coated CNF multilevel heterostructure composite material is prepared through in-situ growth of CoWO4 / Co3W3C and in combination with water bath etching treatment. The in-situ constructed heterostructure catalyst not only improves the stability of the material structure, but also effectively improves the catalytic performance of OER. The preparation technology is simple, large-scale implementation is easy, and the method is suitable for preparing the high-performance OER anode material in batches.

The invention discloses a preparation method of a Cu3Sn alloy electrocatalyst and application of the Cu3Sn alloy electrocatalyst in urea synthesis. The preparation method comprises the specific preparation steps that glucose, dicyandiamide, copper chloride and stannous chloride dehydrate are ground and mixed to be uniform, and a material A is obtained; transferring the obtained material A into a tubular furnace, sintering for 2 hours at 420-500 DEG C in a hydrogen / argon mixed atmosphere, and naturally cooling to room temperature to obtain a material B; and uniformly grinding the obtained material B to obtain the Cu3Sn alloy electrocatalyst. The Cu3Sn alloy electrocatalyst can be used in a reaction system for co-reduction of nitrate and carbon dioxide into urea through electrocatalysis. Compared with a traditional industrial method, the method for preparing urea by catalyzing co-reduction of nitrate and carbon dioxide through the prepared Cu3Sn alloy electrocatalyst consumes greenhouse gas and does not discharge pollutants into air.

The invention belongs to the technical field of anion exchange membrane fuel cells, and discloses a high-stability ruthenium-based hydroxide electrocatalyst used as an anode of an anion exchange membrane fuel cell and a preparation method of the high-stability ruthenium-based hydroxide electrocatalyst. The catalyst is prepared by taking ruthenium as a unique active component, fullerene (C60) as a carbon substrate and polydopamine (PDA) as an additive through argon heat treatment. The preparation method disclosed by the invention is simple and easy to implement, and through the design scheme that C60 with high electron affinity is used as a carrier, the electronic structure of a ruthenium active site is effectively adjusted, and excessive adsorption of a ruthenium-based catalyst to hydroxyl species in a hydrogen oxidation reaction (HOR) process is weakened, so that the ruthenium reaction active site is greatly reserved for hydrogen adsorption, and the hydrogen adsorption efficiency is improved. Therefore, the stability of ruthenium-based electro-catalysis in hydrogen oxidation reaction can be greatly improved.

The invention relates to the field of electrochemical energy conversion, and discloses a method for preparing a metal-nitrogen-carbon composite electrocatalyst through molten salt circulation and application of the metal-nitrogen-carbon composite electrocatalyst, and the method comprises the following steps: step 1, synthesizing a ZIF-8 precursor with a first-level nanometer second-level micrometer structure; 2, the ZIF-8 precursor is subjected to annealing treatment under the protection of inert gas, and a zinc-nitrogen-carbon material is obtained; 3, the zinc-nitrogen-carbon material, ferric chloride hexahydrate and fused salt are mixed and dispersed, and a mixture is obtained; 4, the mixture is dried and then calcined, and a calcined product is obtained; and 5, mixing the calcined product with water. According to the method, the fused salt is recycled, so that the fused salt is efficiently recycled and can be stably recycled, compared with a preparation method of using the fused salt once, the raw material cost is reduced, meanwhile, fused salt recycling is achieved only through water dissolution and centrifugal separation, additional acid and alkali treatment is not needed, and waste liquid discharge is reduced.

The invention relates to the technical field of preparation of high-entropy alloy materials, in particular to a C / S / HES composite electrode material based on high-entropy sulfides and a preparation method and application thereof.The preparation method comprises the following steps that a carbon material is dispersed in N, N-dimethylformamide to obtain a carbon material dispersion liquid, an iron source, soluble metal salt and sublimed sulfur are mixed with a carbon source solution, and the carbon material dispersion liquid is obtained; carrying out hydrothermal reaction to obtain high-entropy sulfide; mixing a carbon source with sublimed sulfur, and carrying out hot melting treatment to obtain a carbon / sulfur positive electrode material; the preparation method comprises the following steps: taking a high-entropy sulfide as an electrocatalyst, mixing and grinding the high-entropy sulfide and a carbon / sulfur positive electrode material, and carrying out hot melting treatment to obtain the C / S / HES composite electrode material based on the high-entropy sulfide. The electrochemical kinetics of soluble NaPSs in the sodium-sulfur battery is accelerated by screening a proper high-entropy sulfide catalytic host, and the electrochemical behavior is improved.

A preparation method of a high-activity nitrogen-doped carbon-loaded CoRu nano-alloy is used for enhancing pH universal hydrogen evolution, and is characterized by comprising the following steps: dissolving dopamine hydrochloride in an aqueous solution containing H2O2 and CuSO4. 5H2O, and magnetically stirring to form a uniform mixture; and pre-wetting carbon cloth with ethanol, immersing the pre-wetted carbon cloth in the dopamine solution for 10 minutes, taking out the pre-wetted carbon cloth, washing the pre-wetted carbon cloth with deionized water for three times, and carrying out vacuum drying to obtain the polydopamine modified carbon cloth marked as PDA / CC. And immersing the obtained PDA / CC into 20 mL of aqueous solution containing Co (NO3) 2.6 H2O and RuCl3 for 6 hours to realize metal ion adsorption. And washing and drying a sample, and calcining the sample in a tubular furnace at 700 DEG C in an N atmosphere for 2 hours to obtain the self-supporting nitrogen-doped porous carbon-loaded CoRu alloy material which is recorded as CoxRu (at) CN / CC. Through a synthesis strategy based on active ion capture and in-situ carbon thermal reduction, and through construction of a nitrogen-doped carbon cobalt ruthenium alloy nanostructure and a strong metal-carrier synergistic effect, efficient hydrogen overflow and establishment of stable active sites are realized; therefore, the performance bottleneck that high activity and high stability of a traditional electrocatalyst in a wide pH range are difficult to cooperate is broken through.

The invention provides a Co (at) CeO2-x heterogeneous catalytic electrode as well as a preparation method and application thereof. The Co-coated CeO2-x heterogeneous catalytic electrode comprises foamed nickel and an electrocatalyst loaded on the surface of the foamed nickel, and the electrocatalyst comprises metal Co particles and CeO2-x with oxygen vacancy. The Co (at) CeO2-x heterogeneous catalytic electrode provided by the invention is prepared only through a process combining a room-temperature electrodeposition method and an air calcination method, has a three-dimensional self-supporting integrated structure, and also has a heterostructure and a porous nanosheet structure, so that more reaction active sites can be exposed, the interface charge transfer capability can be improved, and the catalytic performance can be improved. And the composite material has excellent activity and stability when being used as a cathode and an anode in the application of preparing formate and hydrogen by electrolyzing water under the assistance of glycerol.

The application discloses a method for realizing resource utilization of phenol pollutants in water by using a nickel-ruthenium hybrid electrocatalyst, and belongs to the technical field of environmental electrocatalytic water treatment. The nickel-ruthenium hybrid electrocatalyst loaded on carbon cloth is prepared by using a simple two-step electrodeposition method, aiming at problems such as high energy consumption, high material consumption and high carbon emission of a traditional wastewater treatment mode. The catalyst has high stability and high selectivity, and can realize directional conversion of phenol pollutants in water into high-value p-benzoquinone under mild conditions, so as to simultaneously realize removal of the phenol pollutants in water and recovery of high-value-added chemicals. The application provides a new method for treatment and resource utilization of high-concentration phenol wastewater.

The invention provides a black TiO2 nanosheet (at) Pt nanoparticle photoelectric catalyst and a preparation method and application thereof in methane photoelectric catalytic conversion, black TiO2 is prepared by introducing surface defects (such as oxygen vacancies) so as to expand the visible light response range of the black TiO2, and the surface of the black TiO2 is modified by precious metal nanoparticles (such as Pt), so that the visible light response range of the black TiO2 is expanded. While the photo-induced electron separation is promoted and the catalytic activity is improved, the overall conductivity and the interface electron transfer rate are remarkably improved. Particularly, TiO2 is constructed into an ultrathin two-dimensional nanosheet structure, so that not only can a larger specific surface area and more reaction active sites be provided, but also the diffusion path of photon-generated carriers can be shortened, and the recombination probability can be effectively reduced, thereby further enhancing the photoelectric conversion efficiency. Compared with the prior art, the catalyst provided by the invention has the advantages of ultrathin two-dimensional structure, surface defect regulation and precious metal synergistic modification, and can realize efficient visible light driven photoelectrocatalytic methane conversion.

The invention discloses a method for preparing a tungsten trioxide low-platinum electrocatalyst with a core-shell structure through pulse Joule heating, and belongs to the field of electrochemical catalysts for electrolysis of water. The invention aims to solve the problems that controllable amorphization is difficult to realize on the WO3 surface and a crystal nucleus-amorphous shell composite structure cannot be effectively constructed in the prior art. The preparation method comprises the following steps: 1, preparing a tungsten trioxide carrier with a core-shell structure; and 2, loading a platinum source. The method is used for preparing the tungsten trioxide low-platinum electrocatalyst with the core-shell structure through pulse Joule heating.

The invention discloses a high-entropy perovskite oxide, a preparation method thereof and application of the high-entropy perovskite oxide as an electrocatalyst, and belongs to the technical field of high-entropy transition metal oxides. A sol-gel method is adopted, various metal nitrates and lanthanum nitrate are dissolved in water and ethylene glycol in an equimolar mode, and an ammonium citrate complexing agent is added. And then heating at 120 DEG C for 10 hours. And heating the obtained gel precursor to 600 DEG C in a muffle furnace at a heating rate of 10 DEG C / min, maintaining the temperature for 2 hours, and cooling to obtain the high-entropy perovskite oxide LaBxO3. The high-entropy perovskite oxide electrocatalyst which is simple in synthesis method, stable in structure and easy in raw material obtaining is obtained, and the electrocatalyst can be applied to electrocatalytic nitrate radical reduction and sulfur ion oxidation; and a foundation is laid for developing other high-entropy transition metal oxides as electrocatalysts for synthesizing value-added chemicals by electrocatalyzing nitrate radicals and sulfur-containing wastewater.

The invention relates to the field of efficient integrated assemblies of PEM water electrolysis hydrogen production systems, and discloses an efficient integrated assembly for a PEM exchange membrane water electrolysis hydrogen production system, an anode electrode unit in the integrated assembly comprises a ruthenium-based high-entropy metal oxide electrocatalyst, and the ruthenium-based high-entropy metal oxide electrocatalyst comprises ruthenium, tin, manganese, chromium and tantalum elements; the preparation method of the ruthenium-based high-entropy metal oxide electrocatalyst comprises the following steps: grinding solid inorganic ruthenium salt, tin salt, manganese salt, chromium salt, tantalum salt and sodium chloride to obtain a metal salt mixture; carrying out ball milling to obtain a high-entropy metal oxide precursor; and carrying out heat treatment and water washing treatment on the precursor to obtain the ruthenium-based high-entropy metal oxide electrocatalyst. The invention also discloses application of the electrocatalyst in water electrolysis oxygen evolution reaction in an acid solution and water electrolysis hydrogen production reaction of a PEM proton exchange membrane, and the electrocatalyst shows excellent electrocatalytic activity.

The application discloses a preparation method of mesoporous copper oxide and application thereof. The preparation method comprises the following steps: S1, preparing a hydroxyl copper nitrate microplate by taking calcium carbonate paper as a substrate and copper nitrate as a solvent; S2, synthesizing an ordered copper hydroxide nanowire assembly through an alkali solution reaction; and S3, performing annealing treatment in a muffle furnace to obtain the mesoporous copper oxide microplate. Under the conditions of no hard template, no soft template and no strong acid treatment, the application provides a method for synthesizing the mesoporous copper oxide microplate material with uniform pore structure on the carbonic paper by adopting copper nitrate hydrolysis, alkali etching and annealing, and the synthesis method of the mesoporous structure has the advantages of simple operation, good controllability and low cost. The application also relates to application of the mesoporous copper oxide as an electrocatalyst material in the field of glucose electrochemical sensing.

The invention provides an alkaline hydrogen evolution electrocatalyst and a preparation method and application thereof.The alkaline hydrogen evolution electrocatalyst comprises a carrier and an active component, the carrier comprises a reduced graphene oxide layer and a rare earth element doped transition metal oxide layer which are sequentially stacked, and the active component comprises precious metal; the active component is loaded on the surface of one side, far away from the reduced graphene oxide layer, of the rare earth element doped transition metal oxide layer. According to the alkaline hydrogen evolution electrocatalyst provided by the invention, the transition metal oxide layer doped with the noble metal and the rare earth element can form a synergistic catalysis interface, and the reduced graphene oxide layer is used as a carrier substrate, so that a continuous conductive network can be constructed to guarantee electron transmission, and a loaded material can be dispersed and supported through a lamellar structure of the reduced graphene oxide layer; through the synergistic effect of the components and the structure, the hydrogen evolution reaction activity and stability of the catalyst under the alkaline condition are remarkably improved.

According to the preparation method of the metal atom supported layered manganese oxide electrocatalyst, a precursor solution and foamed nickel are subjected to a hydrothermal reaction, cooling is performed to reach the room temperature after the reaction is finished, the foamed nickel after the reaction is dried, and the layered manganese oxide electrocatalyst is obtained. The layered manganese oxide electrocatalyst is placed in a metal salt electrolyte for electrochemical deposition so as to obtain the metal atom loaded layered manganese oxide electrocatalyst. According to the invention, heterogeneous atoms form metal load on the surface of manganese oxide so as to improve the electrocatalytic activity, selectivity and stability of the catalyst, which is an effective way. The metal load can further regulate and control the interlayer spacing and the electronic structure, more active sites are exposed, and the reaction kinetics can be optimized through bimetal coordination and electronic structure regulation and control; the metal atom doped needle-shaped manganese oxide electrocatalyst is prepared by combining a hydrothermal method with an electrodeposition method, and the preparation method is relatively simpler. In addition, the invention further provides the metal atom supported layered manganese oxide electrocatalyst and application.

The invention provides a foamed ferronickel loaded LDH / MOF heterogeneous electrocatalyst as well as a preparation method and application thereof, and relates to the technical field of electrolyzed water catalysts. According to the catalyst, conductive foamed ferronickel is used as a self-supporting substrate, a laminated and staggered folded NiFe-LDH nanosheet coated two-dimensional NiFe-MOF nanosheet array is loaded on the outer layer, and a nano composite material with a core-shell structure is jointly constructed. The invention also provides a preparation method of the foamed ferronickel loaded LDH / MOF heterogeneous electrocatalyst. The invention also provides an application of the foamed ferronickel loaded LDH / MOF heterogeneous electrocatalyst in electrolyzed water. The catalyst provided by the invention not only effectively improves the overall efficiency of an electrolyzed water system, but also has higher stability and longer service life.

The application discloses a high-activity alkaline electrolytic water oxygen evolution reaction catalyst based on transition metals and a preparation method and application thereof, and belongs to the fields of new energy technologies and electrocatalytic material applications.The electrocatalyst is expressed by a chemical formula of Ni m Fe n LDH / CeO 2‑x / NF.The preparation method comprises the following steps: dissolving a nitrate precursor containing a Ce element in deionized water, then performing electrodeposition on a foam nickel which has been treated in advance, placing the foam nickel in a corresponding transition state metal nitrate solution containing Ni and Fe after high-temperature annealing treatment, and finally performing a hydrothermal reaction to obtain the electrocatalyst. m Fe n LDH / CeO 2‑x / NF.The oxygen evolution performance of the electrocatalyst is obviously superior to that of single-metal-based Ni LDH / CeO 2‑x / NF, single-layer Ni m Fe n LDH / NF and Ni m Fe n LDH / CeO2.The main reasons for improving the oxygen evolution activity of the catalyst are that the catalyst introduces low-spin Fe doping, formation of a heterojunction interface and creation of multi-oxygen vacancies.Meanwhile, the material exhibits sustained high stability, and the design of the catalyst provides technical feasibility for large-scale electrolytic water hydrogen production.