152 results about "Nickel substrate" patented technology

The invention relates to the field of electro-catalytic materials, and particularly discloses a layered transition metal hydroxide catalyst as well as a macro-quantity preparation method and application thereof. According to the method, the nanoparticles are formed through solvent difference induction, the nanoparticles are adsorbed on the foamed nickel substrate, formation of the layered transition metal hydroxide on the foamed nickel substrate is promoted, the layered transition metal hydroxide is prepared through a heterogeneous nucleation mechanism, and compared with a traditional homogeneous nucleation process, disordered aggregation of the nanoparticles can be effectively prevented; the preparation method has the advantages of high dispersity and uniform structure, the preparation method does not depend on conditions such as high temperature and high pressure, the equipment cost, energy consumption and safety risk can be reduced, and the method has universality and environmental friendliness and can be applied to macroscopic preparation of the catalyst with good uniformity.

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

The invention discloses preparation of a phosphate radical modified carbon quantum dot nickel-based catalyst and application of the phosphate radical modified carbon quantum dot nickel-based catalyst in alkaline seawater electrolysis, and belongs to the technical field of hydrogen production through electro-catalysis and seawater electrolysis. The preparation method of the phosphate radical modified carbon quantum dot nickel-based catalyst comprises the following steps: mixing citric acid and urea in water to obtain a carbon quantum dot precursor solution; and mixing the carbon quantum dot precursor solution, phytic acid and a nickel substrate, and reacting to obtain the phosphate radical modified carbon quantum dot nickel-based catalyst. The phosphate radical modified carbon quantum dot nickel-based catalyst is designed by introducing a composite modification layer of carbon quantum dots and phosphate radicals on the surface of a nickel substrate, and the phosphate radical modified carbon quantum dot nickel-based catalyst has an obvious promotion effect on the OER activity through the synergistic effect of PO4 groups and CDs in the phosphate radical modified carbon quantum dot nickel-based catalyst; therefore, the catalyst can show excellent oxygen evolution reaction activity and long-term stability in alkaline seawater containing Br <-> and Cl <->.

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.

The invention relates to the technical field of electro-catalytic materials, in particular to a preparation method of a NiFe LDH / NiFeO / NF composite catalyst. The method comprises the following steps: carrying out acetic acid solution pretreatment on a foamed nickel substrate; growing a nickel-iron precursor on the pretreated foamed nickel through the first hydrothermal reaction, and treating to obtain NiFeO / NF; and growing a nickel-iron layered double hydroxide nanosheet on the surface of the NiFeO / NF through a second hydrothermal reaction to obtain the NiFe LDH / NiFeO / NF composite catalyst. According to the preparation method of the NiFe LDH / NiFeO / NF composite catalyst provided by the invention, a NiFeO / NF matrix is prepared by a hydrothermal synthesis method, after air heat treatment, a NiFe layered double hydroxide nanosheet with a smaller size is synthesized on the surface of NiFeO / NF by adopting a secondary hydrothermal process, and finally the NiFe LDH / NiFeO / NF composite catalyst is obtained.

The invention belongs to the technical field of electro-catalysis water decomposition, and relates to a self-supporting W-NiCoP / NF composite material and a preparation method and application thereof. Cobalt salt, terephthalic acid, acetic acid and foamed nickel are subjected to a first solvothermal reaction, and defect type Co-MOF / NF is obtained; immersing the defect type Co-MOF / NF into a tungstate solution, and then carrying out a second solvothermal reaction to obtain a defect type W-Co-MOF / NF precursor; and carrying out phosphating heat treatment on the defect type W-Co-MOF / NF precursor and a phosphorus source in an inert atmosphere to obtain the W-Co-MOF / NF composite material. According to the preparation method disclosed by the invention, the tungsten-doped nickel-cobalt bimetallic phosphide with rich defect structures is successfully constructed on the foamed nickel substrate through a step-by-step solvothermal and gas-phase phosphating strategy, so that organic combination of a bimetallic synergistic effect and defect engineering is realized; the prepared self-supporting composite material has more active sites, a better electronic structure regulation effect and better stability.

The invention relates to a preparation method and application of an organic ligand modified Ru atom doped NiFe-LDH material. The preparation method comprises the following steps: firstly, uniformly growing a NiFe-LDH nanosheet array on a foamed nickel substrate by adopting a hydrothermal method, and uniformly dispersing Ru atoms in a NiFe-LDH structure through an ion exchange strategy; and then, an organic ligand is introduced by a solvothermal method for modification, so that the NiFe-LDH-coated Ru-BDT composite electro-catalytic material is obtained. The organic ligand effectively inhibits dissolution of Ru atoms under high voltage through coordination, and compared with the prior art, the bifunctional catalytic activity and stability of the catalyst under high current density can be remarkably improved. The preparation method disclosed by the invention is simple in process and good in repeatability, can efficiently utilize noble metal materials and reduce the cost, and has the application potential of industrial hydrogen production by water electrolysis.

The invention relates to a Cu3Ni / NF nanosheet self-supporting electrode and a preparation method thereof, and belongs to the technical field of electro-catalysis. The preparation method of the Cu3Ni / NF nanosheet self-supporting electrode comprises the following steps: mixing CuCl2. 2H2O, polyethylene glycol and malonic acid, heating and stirring to obtain a deep eutectic solvent DESs; the surface of a foamed nickel substrate is coated with a deep eutectic solvent DESs, heating treatment is carried out in an inert atmosphere, and the Cu3Ni / NF nanosheet self-supporting electrode is obtained. The preparation method is simple in preparation process, mild in condition, low in preparation cost, good in element compatibility, capable of achieving industrial production and free of pollution to the environment. And the obtained Cu3Ni / NF nanosheet self-supporting electrode has excellent electrocatalytic activity.

The invention discloses a self-weight configuration oxygen evolution electrode and a preparation method and application thereof.The preparation method comprises the steps that a nickel substrate serving as a working electrode, a platinum sheet serving as a counter electrode and a saturated calomel electrode serving as a reference electrode are placed in a NiCo2O4 precursor solution, constant-potential electro-deposition is conducted on the nickel substrate, and a precursor electrode with a Ni-Co LDH precursor on the surface is obtained; putting the precursor electrode into a heating device for heating and heat preservation, and then taking out the precursor electrode for cooling to obtain a NiCo2O4 electrode with a spinel structure; and sequentially putting the NiCo2O4 electrode into a ferric nitrate nonahydrate aqueous solution and a sodium hydroxide solution, and loading alpha-Fe2O3 nanoparticles on the surface of the NiCo2O4 electrode by using a continuous ion layer adsorption reaction method to obtain the self-weight configuration oxygen evolution electrode. According to the preparation method of the self-weight configuration oxygen evolution electrode, a composite catalyst layer composed of NiCo2O4 and alpha-Fe2O3 of a spinel structure is constructed on a nickel substrate, and the self-weight configuration oxygen evolution electrode can adapt to power fluctuation.

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

This invention discloses a method for preparing and applying a sodium borohydride-modified self-supporting anode for AEM water electrolyzers. Firstly, an amorphous ternary metal hydroxyl oxide precursor is grown in situ on a nickel substrate via room temperature liquid phase deposition. The process involves the presence of Co in solution. 2+ Fe 3+ Ni ions are introduced through slight corrosion of the nickel foam matrix. 2+ The ions, the three, and the OH- produced by hydrolysis ⁻ Co-deposition occurs under the influence of dissolved oxygen, leading to the self-assembly of amorphous nanosheet structures on the substrate surface. Subsequently, a mild chemical reduction treatment with sodium borohydride solution is used to obtain a structurally stable and high-performance self-supporting electrode. The method described in this embodiment is mild, simple, low-cost, and has good versatility.

The application discloses a P-NiMoO4@Mesh-Ni2P core-shell structure catalyst and a preparation method and application thereof. The preparation method of the catalyst comprises the following steps: step 1, cleaning treatment is performed on a nickel substrate; step 2, a precursor NiMoO4 is synthesized on the nickel substrate through a hydrothermal method; step 3, the NiMoO4 is converted into a precursor NiMoO4 / Ni(OH)2 through a secondary hydrothermal method; and step 4, a P-NiMoO4@Mesh-Ni2P core-shell structure catalyst is prepared through phosphorization of the NiMoO4 / Ni(OH)2. The core of the catalyst is a phosphorus-doped NiMoO4 rod-shaped array, and the shell is a fishing net-shaped Ni2P layer. The catalyst exhibits excellent performance in a hydrogen evolution reaction, has high activity and stability, and is suitable for clean hydrogen energy production.

The invention discloses an electrocatalytic reduction dechlorination method for chlorine-containing organic pollutants, which comprises the following steps of: taking a Pd / FeMoO4 / Ni foam composite electrode as a cathode, arranging an anode counter electrode, separating the cathode from the anode counter electrode by a cation exchange membrane, taking chlorine-containing organic pollutant wastewater containing electrolyte as electrolyte in a cathode tank, and separating the anode counter electrode from the cathode by a cation exchange membrane; carrying out electrocatalytic reduction dechlorination reaction by taking an aqueous solution containing electrolyte as electrolyte in the anode tank; the Pd / FeMoO4 / Ni foam composite electrode is obtained by performing in-situ synthesis on a bimetallic oxide FeMoO4 on a foamed nickel substrate through a hydrothermal method to obtain an electrode intermediate, and depositing noble metal Pd on the surface of the electrode intermediate. Compared with catalysts of the same kind, the Pd / FeMoO4 / Ni foam composite electrode has the performance advantages that the hydrogen production and storage capacity is improved, and active hydrogen is effectively stabilized through the capacity, so that the selectivity of the Pd / FeMoO4 / Ni foam composite electrode to the pollutant dechlorination process is remarkably improved, invalid loss is avoided, and a solid foundation is laid for efficient dechlorination.

The invention discloses a nickel-based noble metal multi-shell nanocage material and a preparation method and application thereof, and relates to the technical field of nano functional materials.According to the nickel-based noble metal multi-shell nanocage material and the preparation method thereof, nickel nanoparticles serve as a core material, and the complexing and growth rate of noble metal is regulated and controlled by controlling the using amount of ligands; the technology of precious metal multi-step precise feeding, step-by-step programmed heating and system residual ligand reuse is combined, and precise epitaxial growth of multiple precious metals on the surfaces of the nickel nanoparticles is achieved. And carrying out carbon carrier loading and inorganic acid selective etching to accurately remove a part of nickel matrix and reserve a complete noble metal shell layer, thereby finally preparing the nickel-based noble metal multi-shell nanocage material with a hollow structure.

The invention relates to the technical field of electrolytic hydrogen production, in particular to a hydrogen evolution electrode and a preparation method thereof. The hydrogen evolution electrode comprises a foamed nickel substrate and a Pt-plated cobalt hydroxide nanosheet array which grows on the surface of the foamed nickel substrate in situ, the cobalt hydroxide nanosheet array is uniformly dispersed on the surface of the foamed nickel, and Pt is an amorphous Pt nanocluster which is uniformly dispersed on the surface of the cobalt hydroxide nanosheet. The hydrogen evolution electrode has the advantages of being simple in preparation process, low in cost, high in Pt utilization rate, good in catalytic performance, high in stability and the like, and has wide application prospects in the technical field of seawater electrolysis hydrogen production.

The invention relates to the technical field of catalysts, in particular to a preparation method and application of a NiFeCe-layered double hydroxide catalyst, and the preparation method comprises the following steps: dissolving nickel nitrate hexahydrate, ferric nitrate nonahydrate, cerium nitrate hexahydrate and other raw materials in deionized water according to a specific molar ratio to prepare a precursor solution, pretreating with a foamed nickel substrate, and drying to obtain the NiFeCe-layered double hydroxide catalyst. In-situ growth of the catalyst is carried out by adopting a hydrothermal method, then cleaning and drying are carried out to obtain a product, the preferable doping amount of Ce is 1 mmol, the hydrothermal reaction temperature is 120 DEG C, and the hydrothermal reaction time is 8 hours. The prepared catalyst is of a nanosheet array structure and vertically grows on the surface of foamed nickel, Cl adsorption and erosion are remarkably inhibited through the Ni / Fe / Ce ternary synergistic effect, and oxygen evolution reaction (OER) selectivity and stability are improved. In simulated seawater and real seawater environments, the overpotential of the catalyst is as low as 307-447 mV under the current density of 500-2000 mA. Cm <-2 >, and the catalyst has excellent catalytic activity, strong chlorine corrosion resistance and long service life. The method can be widely applied to the fields of alkaline water electrolysis hydrogen production, seawater electrolysis and the like.

The invention relates to the technical field of water electrolysis hydrogen production, in particular to an oxygen evolution catalyst and a preparation method and application thereof. The preparation method of the oxygen evolution catalyst comprises the following steps: dissolving metal salt in deionized water to prepare a precursor metal solution; immersing the foam metal substrate into the precursor metal solution, carrying out corrosion reaction in an oxygen-containing atmosphere, forming a nickel-cobalt-iron layered hydroxide nanosheet on the foam metal substrate, and preparing an oxygen evolution catalyst; wherein the metal salt comprises two of nickel salt, cobalt salt and iron salt; the foam metal substrate comprises one of a foam nickel substrate, a foam cobalt substrate and a foam iron substrate; metal elements contained in the metal salt are different from metal elements contained in the foam metal substrate. The preparation method of the oxygen evolution catalyst provided by the invention is simple in process and low in raw material cost, and the prepared oxygen evolution catalyst has relatively high oxygen evolution reaction activity and stability.

The invention provides a self-supporting Fe-Ni3S2-coated NiCoLDH core-shell electrocatalyst, a preparation method thereof and a hydrogen production method, and relates to the field of catalysts. The self-supporting Fe-Ni3S2-coated NiCoLDH core-shell electrocatalyst comprises a conductive nickel substrate and a core-shell electrocatalyst arranged on the surface of the conductive nickel substrate, a core in the core-shell electrocatalyst comprises iron-doped nickel sulfide nanosheets, and a shell comprises nickel-cobalt layered double hydroxides. The core and the shell are tightly connected through strong chemical bonding, so that the material keeps structural integrity under a harsh electro-catalysis working condition, and active components are effectively prevented from falling off; the iron-doped nickel sulfide nanosheet with excellent conductivity is used as a natural framework, an efficient electron transmission path is provided for an external nickel-cobalt layered double-metal hydroxide shell layer, the internal resistance of the electrode is remarkably reduced, and reaction kinetics is accelerated.

The invention discloses a preparation method of a FeP / Co2P / NF electrocatalytic seawater hydrogen evolution chlorine-resistant electrode plate, relates to a preparation method of an electrode, and aims to solve the technical problems of poor chlorine resistance, few active sites and poor catalytic effect of the conventional TMPs electrode. The method comprises the following steps: after removing oil and an oxide layer from a foamed nickel substrate, putting the foamed nickel substrate into a mixed solution of cobalt salt, ammonium chloride and urea for hydrothermal reaction; then putting into a mixed solution of ferric salt, urea, aluminum nitrate nonahydrate and sodium dodecyl sulfate for hydrothermal reaction; and soaking with an alkaline solution and then carrying out high-temperature phosphorization to obtain the electrode plate. The overpotential of the electrode plate is 30-38 mV when water is electrolyzed for hydrogen production under the current density of 10 mA. Cm <-2 >, the overpotential of the electrode plate is 66-77 mV when seawater is electrolyzed for hydrogen production, the current density is reduced by 15%-20% after the electrode plate works for 100 hours, and the electrode plate has good chlorine resistance and can be used in the field of water electrolysis for hydrogen production.

The application belongs to the technical field of environmental electrocatalytic electrode preparation, and particularly relates to a preparation method of a magnetic spinel adsorption electrode and application thereof. The specific preparation steps are as follows: 1) dispersing the magnetic spinel catalyst in an electrolyte to form a suspension system; 2) constructing a double-electrode electrochemical system in the suspension system by taking foamed nickel as a cathode; and 3) stirring the suspension system, performing electrolysis reaction, and obtaining the magnetic spinel adsorption electrode after drying. The prepared adsorption electrode does not need to add an additional binder to realize the fixation of the magnetic spinel catalyst on the foamed nickel substrate, overcomes the problem of sharp reduction of the number of active sites and conductivity caused by the binder, and greatly improves the electrode catalytic degradation capacity. In addition, the preparation method does not need to consume additional binders and organic solvents, can effectively reduce the synthesis cost of the spinel electrode and reduce the discharge of waste liquid, and is an environmentally friendly catalyst synthesis method.

The application provides a high-entropy alloy electrode material and a preparation method and application thereof, wherein the preparation method comprises the following steps: S1, taking nickel salt, copper salt, iron salt, molybdenum salt and tungsten salt as raw materials, mixing the raw materials with an aqueous solution of ammonium sulfate, sodium dodecyl sulfonate and sodium citrate to obtain an electroplating solution; S2, performing electrodeposition treatment on a pretreated nickel substrate in the electroplating solution, and then performing water washing and drying treatment in sequence to obtain the high-entropy alloy electrode material. The high-entropy alloy electrode material has relatively high catalytic activity, can improve the reaction efficiency and reduce energy consumption when applied to the water electrolysis process, and the preparation method is simple, low in cost, high in safety, suitable for large-scale production and wide in industrial application prospect.

The invention belongs to the technical field of electrocatalyst preparation, and particularly relates to a preparation method and application of a nickel-manganese-based catalyst. The preparation method comprises the following steps: placing a foamed nickel substrate in a mixed solution of a nickel source and an organic solvent, carrying out a hydrothermal synthesis reaction, carrying out drying treatment, dipping the material in a mixed aqueous solution of a manganese source and a conditioning agent, and adjusting the pH value of the solution to finally obtain the nickel-manganese-based electrocatalyst. The preparation method is simple and low in cost, and the prepared catalyst shows high catalytic activity, high FDCA selectivity, high Faraday efficiency and excellent stability, and has a great industrial application prospect.

The invention discloses a preparation method and application of a superfine hollow CoSenanoneedle material. The method comprises the following steps: (1) mixing and dissolving cobalt nitrate, urea and ammonium fluoride, adding foamed nickel, preserving heat at 110-130 DEG C for 7-9 hours, cooling to room temperature, taking out the reacted foamed nickel, cleaning and drying to obtain a precursor; (2) mixing and dissolving selenium powder and sodium hydroxide, preserving heat at 190-210 DEG C for 7-9 hours, and cooling to room temperature to obtain an intermediate solution; and (3) putting the precursor into the intermediate solution, preserving heat at 140-160 DEG C for 7-9 hours, cooling to room temperature, taking out the reacted foamed nickel, cleaning and drying to obtain the superfine hollow CoSenanoneedle material. The nanoneedles directionally grow from the foamed nickel substrate to form a flower-cluster-shaped multilevel structure, so that the conductivity and the structural stability of a foamed nickel three-dimensional porous framework are reserved, and more catalytic active sites are exposed through the high specific surface area of the hollow nanoneedles.

This invention relates to the field of wastewater treatment technology, and in particular to a bimetallic doped self-supporting electrode, its preparation method, and its application. Constructed via a two-step chemical vapor deposition method, the bimetallic doped self-supporting electrode MN-SnO2 / GF / NF comprises a foamed nickel substrate GF / NF coated with foamed graphite, and a bimetallic doped SnO2 layer MN-SnO2 grown in situ on the foamed nickel substrate GF / NF, wherein M and N are any two of Sb, In, Fe, Co, and Mn. This invention, employing the aforementioned bimetallic doped self-supporting electrode, its preparation method, and its application, possesses advantages such as tight interfacial bonding and fast electron transport, and can efficiently drive sulfate radical-mediated pollutant degradation reactions.

This invention discloses a method for electroplating soft gold onto a circuit board, and also discloses the circuit board. The method includes the following steps: S1: Obtaining a circuit board with a copper layer on its surface; S2: Electroplating a nickel layer on the surface of the copper layer, wherein the surface of the nickel layer has gold bonding lines and non-gold bonding lines; S3: Forming multiple arrayed and spaced bump structures in the gold bonding lines, each bump structure including a nickel substrate and a gold surface layer disposed on the surface of the nickel substrate; S4: Electroplating the circuit board with gold to form a first gold layer on the gold bonding lines and a second gold layer on the non-gold bonding lines, wherein the thickness of the first gold layer is greater than the thickness of the second gold layer. In this way, selective thickening of the gold bonding lines is achieved during the gold plating process, ensuring that the gold bonding lines have a sufficiently thick gold layer to guarantee the reliability of the gold bonding lines, while the non-gold bonding lines maintain a relatively thin gold layer, which can reduce the amount of gold used and lower the production cost of the circuit board.

The invention belongs to the technical field of functional materials, and particularly relates to a three-dimensional heterogeneous difunctional electrode material and a preparation method and application thereof. The preparation method of the three-dimensional heterogeneous difunctional electrode material comprises the following steps: S1, pretreating the foamed nickel substrate; s2, respectively dissolving cobalt nitrate hexahydrate, urea and ammonium fluoride into water to obtain a mixed solution A; s3, carrying out hydrothermal treatment on the pretreated foamed nickel and the mixed solution A; s4, surface cleaning is conducted on the foamed nickel obtained through the hydrothermal treatment with deionized water and ethyl alcohol; and S5, performing vulcanization treatment on the electrode material obtained in the step S4. In the alkaline seawater electrolysis and hydrazine oxidation reaction coupling process, the synthesized electrode material shows the hydrazine oxidation potential far lower than that of commercial precious metal in the hydrazine oxidation reaction, the energy consumption of seawater electrolysis hydrogen production in a mixed system is greatly reduced, and wide application prospects are achieved.

The invention provides a multi-component alloy hydrogen evolution electrode as well as a preparation method and application thereof, and relates to the technical field of hydrogen energy supply. The preparation method comprises the following steps: S1, preparing an electroplating solution: adding metal salt and an additive into water for dissolving, and adjusting the pH value to 7-12 to obtain the electroplating solution; and S2, a nickel substrate is placed in the electroplating solution in the S1 for direct-current electrodeposition, a catalyst coating is formed on the surface of the nickel substrate, and the multi-element alloy hydrogen evolution electrode is obtained. According to the method, the nickel substrate is placed in the electroplating liquid with the specific pH value, the microstructure of the surface of the sample can be effectively regulated and controlled through coordinated regulation and control of multiple metal salts and additives and in combination with specific electrodeposition parameters, the specific surface area of a plating layer is improved, and the combination degree of the plating layer and the substrate is enhanced; after morphology regulation and control, the catalytic performance of the electrode and the long-term stability of the multi-element alloy hydrogen evolution electrode can be obviously improved, and the application requirement for hydrogen production through alkaline electrolysis of water can be better met.

The application belongs to the technical field of catalyst preparation, and particularly relates to a composite catalyst containing molybdenum oxide and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing molybdate and a ligand to obtain a mixed solution; (2) soaking foamed nickel in the mixed solution to obtain a suspension; wherein the soaking time is not less than 1 h; and (3) performing hydrothermal reaction and calcination. The preparation method utilizes the etching effect of molybdate on foamed nickel, and the foamed nickel is immersed in a mixed solution containing molybdate and a ligand, so that the nickel in the foamed nickel is dissolved in the form of ions, and a nickel-molybdenum complex transition layer is grown in situ on the surface of the foamed nickel by the molybdate ions and the ligand; a nickel-molybdenum-based catalyst precursor is grown on the complex transition layer through hydrothermal reaction, and the composite catalyst is obtained after calcination, so that the catalyst is firmly anchored on the foamed nickel substrate, thereby improving the stability and impact resistance of the catalyst and avoiding the shedding of active components in the catalyst.

The invention relates to an amino acid mediated molybdenum-doped cobalt-based three-dimensional layered heterostructure catalyst and application thereof. A preparation method of the catalyst comprises the following steps: preparing a foamed nickel substrate; the preparation method comprises the following steps: dissolving cobalt metal salt, a carbon source precursor and amino acid in a mixed solution containing N, N-dimethylformamide, ethanol and deionized water, and carrying out a hydrothermal reaction to obtain a cobalt-based precursor coated with a carbon layer; calcining the cobalt-based precursor coated with the carbon layer in an inert atmosphere to obtain a cobalt-based catalyst coated with the carbon layer; molybdenum metal salt is dissolved in deionized water, the cobalt-based catalyst coated with the carbon layer is immersed in the solution, a hydrothermal reaction is carried out, and the amino acid mediated molybdenum-doped cobalt-based three-dimensional layered heterostructure catalyst is obtained. The molybdenum-doped cobalt-based three-dimensional layered heterostructure catalyst is prepared through hydrothermal and calcination methods, and the obtained catalyst has high catalytic activity and good stability in a urea oxidation coupling hydrogen production reaction.

The application relates to a trace noble metal modified NiMo catalyst and a preparation method and application thereof, relates to a bifunctional molybdenum-nickel-based electrocatalyst, and aims to solve the technical problems of high cost and low efficiency of existing water electrolysis hydrogen production catalysts. The catalyst is micrometer-level square columnar molybdenum-nickel alloy microcrystals in situ grown on a foam nickel substrate, and the surface of the molybdenum-nickel alloy microcrystals is attached with noble metal elemental osmium, ruthenium or iridium. The preparation method comprises the following steps: placing the foam nickel in a mixed solution of nickel nitrate and ammonium molybdate for hydrothermal reaction, then dropping a noble metal salt solution on the surface of the foam nickel, and annealing at high temperature to obtain the trace noble metal modified NiMo catalyst. The catalyst has a HER side overpotential of only 11.6 mV and an OER side overpotential of only 243.8 mV under an electric current density of 10 mAcm ‑2 2 in alkaline seawater. The HER stability in seawater is over 1000 h, the OER stability is over 1000 h, and the catalyst can be used in the field of seawater electrolysis hydrogen production.