292 results about "Nickel substrate" patented technology

The invention relates to a preparation method of a three-dimensional ferrocobalt metal oxide oxygen evolution catalyst. According to the method, foamed nickel is selected as a carrier, the foamed nickel is pretreated, a metal ion and ethanol mixed solution is evenly adsorbed to the surface of the foamed nickel, then open fire ignition is carried out, and a second-level self-limiting combustion process is carried out, so that metal ions form a ferrocobalt metal oxide material with a three-dimensional network structure in situ on the surface of the foamed nickel. The method is simple and easy to implement, a target product can be generated within second-level time, and the area of a foamed nickel matrix is adjusted according to needs, so that the three-dimensional ferrocobalt metal oxide catalyst is prepared on a large scale. The material obtained by the invention is used as an oxygen evolution anode catalyst, and the three-dimensional network-shaped ferrocobalt metal oxide oxygen evolution catalyst shows excellent electrochemical performance.

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 provides a copper-nickel alloy catalytic electrode and a preparation method and application thereof. The copper-nickel alloy catalytic electrode comprises a foamed nickel substrate and a copper-nickel alloy vertically loaded on the surface of the foamed nickel substrate, the molecular formula of the copper-nickel alloy is Cu < 0.81 > Ni < 0.19 >, and the copper-nickel alloy is of a dendritic nanostructure. The preparation method comprises the following steps: adding copper sulfate, nickel sulfate and ammonium sulfate into water, and uniformly stirring to obtain an electrolyte; taking a foamed nickel substrate as a working electrode, taking a saturated silver-silver chloride electrode as a reference electrode, taking a platinum sheet or a graphite rod electrode as a counter electrode, and applying constant current density to the working electrode to obtain a preset electrode; and alternately cleaning the preset electrode by using ethanol and distilled water, and carrying out vacuum drying to obtain the copper-nickel alloy catalytic electrode. According to the prepared copper-nickel alloy catalytic electrode, the copper-nickel alloy is in a dendritic morphology, has abundant active sites and a high specific surface area, and has excellent catalytic activity and stability in hydrogen preparation by coupling hydrogen evolution reaction for synthesizing adipic acid through electro-catalysis of cyclohexanone.

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 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 relates to a ruthenium nano-cluster / trinickel disulfide heterojunction composite material as well as a preparation method and application thereof. According to the composite material, foamed nickel serves as a substrate material, a Ni3S2 nanosheet array grows on the surface of the substrate material in situ, and ruthenium nanoclusters are anchored on the surface of the Ni3S2 nanosheet array to form the heterojunction composite material. According to the preparation method, the Ni3S2 nanosheet array grows on the foamed nickel substrate in situ, then the composite material with the ruthenium nanocluster anchored on the Ni3S2 surface is prepared through a chemical etching method, and the preparation method is simple, relatively low in cost and suitable for large-scale production; the prepared heterojunction composite material forms a nanosheet array structure and shows a honeycomb structure, so that the catalyst has a relatively large specific surface area, provides more active sites for catalytic reaction, is high in catalytic activity, and can be used as a catalyst applied to hydrogen evolution and oxygen evolution of water electrolysis reaction in electro-catalysis.

The invention provides a hydrogen storage catalyst, a preparation method thereof and application of the hydrogen storage catalyst in a hydrogen fuel cell, and belongs to the technical field of new energy. The preparation method of the hydrogen storage catalyst provided by the invention comprises the following steps: electroplating the surface of a nickel substrate to prepare a cobalt-phosphorus coating to obtain the hydrogen storage catalyst, the electroplating voltage ranges from 8.5 V to 9.5 V, the electroplating time ranges from 4.5 min to 5.5 min, and the electroplating temperature ranges from 25 DEG C to 35 DEG C. According to the method, the electroplating voltage, time and temperature are optimized, so that the quality of the cobalt-phosphorus coating can be improved, the cobalt-phosphorus coating is granular, and extending branches are formed at the protruding positions, so that the seawater corrosion resistance of the hydrogen storage catalyst is improved.

A biocompatible surgical article is provided for cutting biological tissue or implantation in contact therewith. The surgical article has a composition of tungsten carbide-nickel with a percentage of additional metal carbides present. A typical composition in total weight percentages is WC 85 to 95%, Cr3C2, Mo2C, VC each alone or in combination being present from 0 to 2%, and Ni constituting the remainder. The composition is formed to have a mean grain size of between 200 and 800 nm with a particle dispersion index (PdI) corresponding to (the square of the standard deviation) / (mean grain size) of between 0 and 0.6, and in some embodiments between 0.02 and 0.2.

The present invention relates to a device-produced medical isotope 225 Photonuclear reaction preparation in Ac production technology 225 Ac radium target design, specifically involving a method for producing 225 Ac's 226 Ra isotope target and its application. 226 The Ra isotope target comprises a nickel substrate, 226 Ra isotope sample, nickel electroplating layer and nickel protective shell; wherein, 226 The Ra isotope sample is evenly concentrated in the center of the nickel substrate, and the nickel electroplating layer covers 226 The outer surface of the Ra isotope sample, and the nickel substrate and nickel electroplating layer will 226 The Ra isotope sample is wrapped in the middle; the nickel protective shell wraps the nickel electroplating layer. 226 Ra isotope targets can be used in electron linear accelerators as a photonuclear reaction production 225 Ac raw material target, can improve 225 Production of Ac isotopes.

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 relates to a preparation method and application of a hollow nanorod array oxygen evolution electrode, and belongs to the field of hydrogen production by alkaline electrolysis of water. The self-supporting nickel-iron double-metal hydroxide nanosheet coated cobalt hydroxide hollow nanorod array oxygen evolution electrode is obtained through a continuous electro-deposition method; foamed nickel is used as a substrate, and catalytic active components loaded on the substrate are cobalt hydroxide and ferro-nickel double-metal hydroxide; a hollow nanorod structure vertically grows on the surface of the foamed nickel substrate, and the hollow nanorod structure comprises a hollow nanorod-shaped cobalt hydroxide layer located in the hollow nanorod structure and a plurality of layers of nickel-iron double-metal hydroxide nanosheets wrapping the surface of the hollow nanorod-shaped cobalt hydroxide layer; the diameter of the hollow nanorod is 0.2-1 micron, and the length of the hollow nanorod is 2-3 The electrode provided by the invention has unique morphology and good oxygen evolution catalytic activity.

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 discloses a NiFe-LDH-coated E-PBA composite electrocatalyst rich in oxygen vacancies as well as a preparation method and application of the NiFe-LDH-coated E-PBA composite electrocatalyst. The preparation method specifically comprises the following steps: firstly, carrying out alkali etching on NiFe-PBA which is electrodeposited on foamed nickel, and then electrodepositing an ultrathin NiFe-LDH nanosheet on the surface of the NiFe-PBA. Alkali etching and electro-deposition enable the composite catalyst to contain rich oxygen vacancies, and the OER intrinsic activity can be enhanced by reducing band gaps and adsorption; the three-dimensional NiFe-LDH-coated E-PBA heterostructure can adjust interface charge distribution, optimize adsorption / desorption energy of an OER intermediate and release more active sites and mass transfer channels; the foamed nickel substrate provides rapid electron transfer and mass transfer. Therefore, the NiFe-LDH-coated E-PBA shows excellent alkaline water OER performance and stability, the overpotential is only 263 mV when the current density is 100 mA / cm < 2 >, and the NiFe-LDH-coated E-PBA can stably electrocatalytically decompose water for 50 h under the constant current density of 50 mA / cm < 2 >.

The invention relates to the design of a radium target for preparing 225Ac through a photo-nuclear reaction in the technical field of production of a mechanical produced medical isotope 225Ac, in particular to a 226Ra isotope target for producing 225Ac and application of the 226Ra isotope target. The 226Ra isotope target comprises a nickel substrate, a 226Ra isotope sample, a nickel electroplated layer and a nickel protective shell; wherein the 226Ra isotope samples are uniformly concentrated at the central position of the nickel substrate, the nickel electroplated layer covers the outer surfaces of the 226Ra isotope samples, and the nickel substrate and the nickel electroplated layer wrap the 226Ra isotope samples in the middle; and the nickel protective shell wraps the nickel electroplated layer. The 226Ra isotope target can be applied to an electron linear accelerator and can be used as a raw material target for producing 225Ac through a photo-nuclear reaction, and the production quantity of the 225Ac isotope can be increased.

The invention discloses a method for preparing a Raney nickel electrode through electro-deposition of nickel-zinc alloy and application. The method comprises the steps that a nickel-based substrate is pretreated; the pretreated nickel-based substrate serves as a cathode, an electrochemical deposition reaction is carried out in an electrolytic bath containing electroplating liquid, and the electroplating liquid comprises nickel salt and zinc salt; carrying out heat treatment on the nickel-based substrate subjected to electrochemical deposition; and activating the nickel-based substrate subjected to heat treatment to remove the zinc element to obtain the Raney nickel electrode. According to the Raney nickel electrode, valence electrons can be redistributed by depositing the nickel-zinc alloy phase on the nickel substrate, so that electron transmission is accelerated, and the conductivity of the electrode is improved; the nickel-zinc alloy is slow and uniform in reaction in the activation process, nickel-zinc crystal nucleuses can be uniformly nucleated and grow, and a uniform pore structure can be formed after activation, so that the active area of the catalyst is greatly increased, and the hydrogen reaction rate is increased.

The invention relates to the technical field of electrode materials, and particularly discloses a ferrocobalt oxalate / foamed nickel composite material and a preparation method and application thereof. Nanometer flower-shaped cobalt iron oxalate (CoFeC2O4) is loaded on a foamed nickel substrate through a simple coprecipitation method. Through the synergistic effect of components and morphology, the hydrazine oxidation reaction can be started at a lower overpotential, the reaction kinetics process is accelerated, meanwhile, the cathode hydrogen evolution reaction is promoted, and the efficiency of the whole water electrolysis hydrogen production system is synergistically improved; the chemical property of the ferrocobalt oxalate is relatively stable, and the structure and catalytic performance of the ferrocobalt oxalate can be maintained for a long time; in addition, the raw materials cobalt and iron are abundant in reserves, the cost is far lower than that of a noble metal catalyst, the preparation process is simple, the material can be prepared at the room temperature, industrial large-scale production is facilitated, the material shows huge application potential in the field of hydrazine oxidation assisted water electrolysis hydrogen production, and efficient and sustainable development of the hydrogen energy industry is expected to be promoted.

The invention relates to the field of hydrogen production by alkaline electrolysis of water, and discloses a cerium-doped ferronickel-based composite catalytic material and a preparation method and application thereof, the cerium-doped ferronickel-based composite catalytic material comprises a foamed nickel substrate and a cerium-doped ferronickel-based electrode layer coating at least part of the foamed nickel substrate; the mass ratio of a cerium element to a nickel element to an iron element in the cerium-doped nickel-iron-based electrode layer is 1: (60-75): (20-40); and the average pore diameter of the cerium-doped nickel-iron-based electrode layer is 1-3 microns. The attenuation rate of an electrode layer of the cerium-doped ferronickel-based composite catalytic material is smaller than or equal to 0.05 mV / h under 1000 h, the precipitation amount of a nickel element is smaller than or equal to 2 micrograms / L under 1000 h, the precipitation amount of an iron element is smaller than or equal to 100 micrograms / L, and the cerium-doped ferronickel-based composite catalytic material has excellent oxygen evolution activity and stability.

The invention belongs to the field of chemical engineering, and particularly relates to a nanosheet flower-cluster-shaped Ni-Fe-O-S / NF catalyst and a preparation method thereof. The invention relates to a nano-sheet flower-cluster-shaped Ni-Fe-O-S / NF electrode material prepared through a ZIF-67 / NF derivation strategy, namely, the Ni-Fe-O-S / NF electrode material disclosed by the invention is directly grown on a conductive foam nickel substrate in situ by etching ZIF-67; the high-activity difunctional electrocatalyst mainly relates to transition metals such as Ni, Fe, S and O. When the Ni-Fe-O-S / NF catalyst disclosed by the invention is applied to 1.0 M KOH electrolyzed water, the Ni-Fe-O-S / NF catalyst shows good bifunctional catalytic activity.

The invention belongs to the technical field of electrode plates, and particularly relates to a high-activity binary alloy hydrogen evolution electrode plate and a preparation process method. The preparation process method comprises the following steps: obtaining a metal nickel electrode substrate and white corundum sand with different particle sizes; carrying out cleaning treatment on the metal nickel initial electrode substrate; the pretreated metal nickel initial base body serves as a working electrode, and sand blasting pretreatment is conducted on a metal nickel electrode base body through white corundum sand; dust removal operation is conducted on the metal nickel electrode base body subjected to sand blasting pretreatment; and spraying binary metal alloy powder on the intermediate hydrogen evolution electrode plate through an atmospheric plasma spraying process to form the high-activity binary alloy hydrogen evolution electrode plate. The whole preparation process method sequentially comprises the steps of cleaning treatment, sand blasting pretreatment, atmospheric plasma spraying, natural cooling and the like, the process method for preparing the electrode plate is optimized, it is guaranteed that the electrode plate has excellent long-time hydrogen evolution stability when the electrode plate is subjected to a hydrogen evolution reaction, and the excellent hydrogen production effect can be achieved.

The invention relates to a preparation method and application of a thermal shock induced ferrocobalt double-doped metastable phase nickel / nickel oxide heterostructure (Co, Fe-Ni / NiO / NF) composite electrode. The preparation method comprises the following steps: cutting and cleaning the foamed nickel substrate; the preparation method comprises the following steps: growing a nickel-cobalt-iron layered double hydroxide nanosheet on a foamed nickel substrate through a constant-voltage deposition method; nickel-cobalt-iron prussian blue analogue nanoparticles grow in situ on the surface of the nickel-cobalt-iron layered double hydroxide nanosheet through an ion exchange method; and preparing the Co, Fe-Ni / NiO / NF composite electrode through a thermal shock method. The composite electrode has excellent catalytic activity and stability as a working electrode for hydrogen evolution and oxygen evolution reactions. The composite electrode can be directly used as a cathode and an anode of an anion-exchange membrane electrolytic cell to efficiently catalyze a full-water decomposition reaction at different temperatures, and the electrolytic cell can stably operate for 1000 hours and 240 hours under the current densities of 0.1 A cm <-2 > and 1.0 A cm <-2 > respectively, so that the composite electrode has a good application prospect.

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 discloses a preparation method of a thermal oxidation anode. The preparation method comprises the following steps: pretreating a substrate; then nickel salt, ferric salt, chromium salt, cerium salt, sodium citrate, citric acid and isopropanol are selected and dissolved in water, and a mixed coating solution is obtained; then carrying out first-stage high-temperature oxidation treatment on the nickel substrate; secondly, the oxidized nickel net is coated with prepared coating liquid for second-stage thermal oxidation treatment, a thermal oxidation anode is formed, multiple second-stage thermal oxidation treatment is conducted many times to obtain multiple stacked catalyst layers, and the catalyst layers and the base body are firmly combined and are not prone to falling off; after the outer catalyst layer falls off, the inner catalyst layer can continue to carry out oxygen evolution reaction without influencing the strength and stability of the reaction, the service life of the electrode is greatly prolonged, the metal salt is added to form an oxide at high temperature, so that the electrode has good corrosion resistance, the transition metal is used to save the cost, the overpotential is effectively reduced, and the service life of the electrode is prolonged. And the service life is long.

The invention provides a nickel-rich layered positive electrode material, a preparation method thereof and a solid-state battery. The nickel-rich layered positive electrode material comprises a nickel-rich base material and a nitrogen-doped carbon coating layer coating the surface of the nickel-rich base material, the nickel-rich matrix material comprises a nickel-cobalt-lithium layered oxide inner core and a nickel-cobalt-manganese-lithium layered oxide shell layer positioned on the surface of the nickel-cobalt inner core; the molar weight ratio of nickel in the nickel-cobalt-lithium layered oxide core is greater than that of nickel in the nickel-cobalt-manganese-lithium layered oxide shell layer. The positive electrode material provided by the invention is stable in structure and excellent in capacity, rate and cycle performance.

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 discloses a NiMoO4 / Ni (OH) 2 (at) NiPx layered structure catalyst as well as a preparation method and application of the NiMoO4 / Ni (OH) 2 (at) NiPx layered structure catalyst. The preparation method of the catalyst comprises the following steps: step 1, cleaning the nickel substrate; step 2, synthesizing a nickel molybdate (NiMoO4) precursor on the nickel substrate through a hydrothermal method; and step 3, growing a nickel hydroxide and nickel phosphide compound (Ni (OH) 2 and NiPx) on the surface of NiMoO4 through an electro-deposition method. The catalyst has a three-dimensional layered structure, a one-dimensional NiMoO4 micron / nanorod is used as a support, a two-dimensional Ni (OH) 2 nanosheet grows on the surface of NiMoO4, and zero-dimensional NiPx nanoparticles are embedded on the Ni (OH) 2 nanosheet. The catalyst shows excellent performance in hydrogen evolution reaction, has high activity and good stability, and is suitable for clean hydrogen production.

The invention belongs to the technical field of hydrogen production by electrocatalytic decomposition of water, and provides an iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst and application thereof in electrolyzed water. The iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst comprises a nickel substrate, wherein a porous catalytic activity layer of three-dimensional flower-shaped spherical nanoparticles formed by stacking two-dimensional nanosheets is loaded on the surface of the nickel substrate. The catalytic active layer comprises an iron-doped hexagonal stacked nickel hydroxide structure, the catalytic active layer comprises an iron-doped cubic stacked cerium oxide structure, and no iron with a crystalline structure exists in the catalytic active layer. The iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst disclosed by the invention shows excellent oxygen evolution performance in an oxygen evolution reaction of electrocatalytic water decomposition.

The invention discloses a preparation method and application of a Ni3S2-Ni (OH) 2 heterostructure nanosheet catalyst, Ni (OH) 2 is grown in situ on a foamed nickel substrate by using a hydrothermal method, and hydroxyl anions in a nickel hydroxide nanosheet array are partially replaced by active sulfur anions released by sodium sulfide through anion exchange reaction to form Ni3S2-Ni (OH) 2 heterostructure nanosheets. According to the catalyst prepared by the method, due to the graded porous structure of the foamed nickel, rapid diffusion of ions is effectively ensured; the ultrathin nanosheet structure provides a relatively large electrochemical active area, and more active sites are exposed; the heterostructure formed by sulfur doping adjusts the electronic structure of the catalyst, reduces the energy barrier of surface reconstruction, significantly improves the catalytic activity of the material, can be used as a catalytic electrode in electrochemical ammoxidation reaction, and effectively improves the ammonia decomposition efficiency.

The invention relates to the technical field of electro-catalytic material synthesis, and particularly discloses a tower-shaped nickel hydroxide catalytic material and a preparation method thereof. The preparation method of the tower-shaped nickel hydroxide catalytic material comprises the following steps: (1) surface treatment of a nickel substrate: performing ultrasonic cleaning treatment on the nickel substrate, and performing vacuum drying to obtain the cleaned nickel substrate; and (2) synthesis of tower-shaped nickel hydroxide: dissolving phosphate to obtain a phosphate solution, adding hydrogen peroxide, stirring, adding the cleaned nickel substrate, and carrying out hydrothermal reaction to obtain a semi-finished product of tower-shaped nickel hydroxide. And (3) cleaning and drying the tower-shaped nickel hydroxide: cleaning the semi-finished product tower-shaped nickel hydroxide, and carrying out vacuum drying to obtain the tower-shaped nickel hydroxide catalytic material. The method is simple in process, relatively low in cost and easy for large-scale synthesis, and has a relatively good large-scale commercial application prospect; and the specific morphology effectively exposes active crystal faces and active sites, and as an excellent catalyst, the catalyst can improve the hydrogen production rate and the organic matter oxidation rate.