413 results about "Metallic Nickel" patented technology

The invention discloses a nickel-iron-based bimetallic organic framework catalyst and a preparation method thereof, and belongs to the field of electrochemical catalyst preparation, the preparation method comprises the following steps: step 1, dissolving a metal nickel salt in pure water, and carrying out ultrasonic dispersion to obtain a solution A; the preparation method comprises the following steps: dissolving a ferrocene dicarboxylic acid ligand in N, N-dimethylformamide to obtain a solution B; ultrasonically stirring and uniformly dispersing the solution A and the solution B to obtain a mixed solution; and 2, synthesizing the nickel-iron-based bimetallic organic framework catalyst from the mixed solution by using a hydrothermal method. The nickel-iron-based bimetal organic framework catalyst prepared by the preparation method disclosed by the invention shows good OER catalytic performance in an alkaline medium.

The invention relates to a stainless steel flux-cored wire for welding 5% Ni steel, the stainless steel flux-cored wire is prepared by coating powder with a stainless steel strip, the mass of the powder accounts for 22%-28% of the total mass of the flux-cored wire, and a flux core comprises the following components in percentage by weight: 15.0%-30.0% of chromium metal powder, 9.0%-20.0% of nickel metal powder, 3.0%-10.0% of molybdenum metal powder, 2.0%-8.0% of electrolytic manganese metal, 30.0%-35.0% of rutile, 0.5%-3.0% of quartz, 2.0%-8.0% of albite, 0.5%-3.0% of potassium feldspar, 0.5%-5.0% of cryolite and 0.2%-0.5% of self-made raw materials. And the balance of reduced iron powder and inevitable impurities. The external steel strip is an austenitic stainless steel strip 304L, and the carbon content of the external steel strip is smaller than or equal to 0.025%. The flux-cored wire is mainly matched with a steel plate with the Ni content being about 5% for welding, the low-temperature impact of a welded joint of the flux-cored wire at the temperature of-140 DEG C can reach 40 J, the tensile strength is larger than 600 MPa, and the flux-cored wire is good in crack resistance and excellent in comprehensive performance.

The invention discloses a preparation method of a nickel-based catalyst and the nickel-based catalyst. The preparation method of the nickel-based catalyst comprises the following steps: S1, completely dissolving an acid source, cerium salt and a solvent; s2, carrying out hydrothermal reaction on the solution obtained in the step S1; s3, carrying out solid-liquid separation on the product obtained in the step S2, and washing, drying and calcining the obtained solid product to form a carrier which is cerium dioxide derived from a metal organic framework; s4, an active component is loaded on the carrier, and the active component is metallic nickel or nickel oxide. According to the preparation method of the nickel-based catalyst, the nickel-based catalyst with relatively high specific surface area and developed mesoporous channels can be prepared, thermal agglomeration of active sites of metal nickel can be avoided, and the stability and catalytic performance of the nickel-based catalyst are improved.

The invention relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method of the high-temperature-resistant flux-cored wire. The high-temperature-resistant flux-cored wire containing the rare earth elements comprises a welding wire skin and a flux core. The flux core comprises the following raw materials of dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, ferro-aluminum, potassium cryolite, potassium titanate, sodium titanate, fine iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, nitrided ferrochrome, bismuth oxide, auxiliaries and the balance reduced iron powder. The auxiliary agent is a mixture of a zirconium-iron alloy, a titanium-iron alloy and an aluminum-magnesium alloy. A specific alloy auxiliary is introduced into the flux core to protect stable transition of rare earth yttrium, yttrium and multiple components synergistically optimize the weld joint performance, 253MA heat-resistant steel is matched, slag and electric arc regulation and control components and a reasonable process are matched, and the welding quality of the welding wire is improved.

The invention belongs to the technical field of preparation of high-quality metallic nickel connecting strips for new energy batteries, and provides a preparation process for optimizing residual stress of a metallic nickel stamping connecting sheet for a new energy battery, which specifically comprises the steps of material selection, striping, continuous die stamping, inert atmosphere protection annealing, and residual stress detection and control. The range of corners and chamfers of a stamping die adopted in the progressive die stamping is 0.2 mm-1 mm, and the fit dimensional tolerance of a female die and a male die of the stamping die is controlled to be + / -0.05 mm; and the stamping surface in contact with the metal nickel strip is processed by adopting an electrochemical corrosion milling method, the roughness Ra of the stamping surface is less than 0.4 mu m, and the hardness HRC is more than or equal to 55. The metal nickel connecting strip prepared through the method is low in residual stress and small in size deformation after being used, the service life of the metal nickel connecting strip is prolonged, safety and reliability of the metal nickel connecting strip are improved, and the application prospect is wide.

There is disclosed a method of constructing a layered double hydroxide (LDH) material comprising selected metal ions, and employing metallic vanadium carbide (V2C) for promoting conductive properties of the LDH material, wherein the layered LDH material is a trimetallic LDH material. The trimetallic LDH material comprises selected Ni2+, Co2+, and A3+ metal ions with its cationic configuration for improving photocatalytic properties of the LDH material, wherein trimetallic nickel-cobalt-aluminium layered double hydroxide (NixCoyAlz LDH) and vanadium carbide MXene (V2C)-based composite is coupled with a graphitic carbon nitride (g-C3N4) nanosheet, to form a hybrid-junction photocatalyst. Also disclosed is a layered structure of vanadium carbide (V2C) MXenes, comprising trimetallic nickel-cobalt-aluminium layered double hydroxide (NixCoyAlz LDH) and vanadium carbide MXene (V2C) coupled with graphitic carbon nitride (g-C3N4), forming a NixCoyAlz LDH / g-C3N4 hybrid-junction photocatalyst.

The invention provides a flux-cored wire, a manufacturing method of the flux-cored wire, a gas-shielded arc welding method and deposited metal. The flux core of the flux-cored wire comprises the following components in percentage by weight: 27.5 to 29.5 percent of rutile, 1.0 to 2.0 percent of ferrovanadium, 0.2 to 0.3 percent of bismuth oxide, 0.8 to 1.2 percent of cryolite, 12.5 to 15.0 percent of high-carbon ferrochrome, 5.0 to 6.5 percent of electrolytic manganese metal, 4.5 to 6.5 percent of metal nickel, 1.0 to 3.0 percent of feldspar, 1.5 to 2.5 percent of ferromolybdenum, 1.0 to 2.5 percent of aluminum-magnesium alloy, 32.0 to 35.0 percent of micro-carbon ferrochrome, 0.5 to 1.5 percent of ferrotitanium, 1.15 to 2.85 percent of fluorite, 0.8 to 2.0 percent of ferrosilicon and 0.6 to 1.5 percent of lithium carbonate. In the invention, the alloy content of deposited metal and the hardness of the surfacing layer are controlled by adjusting the percentage of the flux core in the total weight, the surfacing layer with excellent corrosion resistance and proper hardness is ensured to be obtained, and the service life of the wrapper roller is prolonged. And meanwhile, by controlling all the components in the flux powder of the flux-cored wire and the proportion, the flux-cored wire has excellent welding process performance.

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 provides a flux-cored wire for marine crack arrest steel and a preparation method and application of the flux-cored wire, and particularly relates to the technical field of welding materials. The flux-cored wire comprises a steel strip and a flux core filled in the steel strip, and the flux core comprises the following components in parts by weight: 10-15 parts of rutile, 5-6 parts of quartz, 2-4 parts of ferrotitanium, 20-40 parts of sodium fluoride, 20-40 parts of potassium feldspar, 6-18 parts of manganese-silicon alloy, 4-8 parts of low-carbon ferromanganese, 1.5-2.5 parts of magnesium powder, 1.5-2 parts of rare earth ferrosilicon, 0.2-0.4 part of ferroboron, 1-2 parts of metallic nickel and 1.5-6 parts of iron powder. The ship crack arrest steel flux-cored wire has the advantages of being high in strength, good in low-temperature toughness, good in crack resistance, high in deposition rate, stable in electric arc, little in splashing, easy in slag removal and attractive in weld joint forming, and is suitable for welding of crack arrest steel at a core structure part of an ultra-large container ship.

The invention discloses a heat-resistant aluminum alloy material and a preparation method thereof, and relates to the technical field of metal material metallurgy, and the heat-resistant aluminum alloy material comprises the following components in parts by weight: 78-85 parts of pure aluminum ingot; 4-6 parts of electrolytic copper blocks; 1.5 to 2.5 parts of magnesium ingot; 0.8 to 1.5 parts of zinc particles; 2 to 3.5 parts of metal nickel powder; 0.1 to 0.3 part of titanium-aluminum alloy; 0.05 to 0.15 part of a zirconium-aluminum alloy; 0.08 to 0.2 part of scandium aluminum alloy; 0.05 to 0.12 part of a cerium rare earth metal block; according to the aluminum alloy material disclosed by the invention, the high-temperature performance of the aluminum alloy material is remarkably improved by optimizing the composition proportion of the alloy. Elements such as copper and nickel are added to form a stable strengthening phase, so that the high-temperature strength and the creep resistance are enhanced; due to introduction of rare earth elements cerium and scandium, crystal grains are refined, and the thermal stability of the material is improved; and through compound addition of zirconium and titanium, grain boundary migration at high temperature is further inhibited, the softening phenomenon is effectively delayed, and the material still keeps excellent mechanical properties and oxidation resistance in a long-term high-temperature environment.

The invention relates to a method for recovering nickel and cobalt from a mixture of compounds of these metals from the recycling of spent lithium-ion batteries, comprising the following steps: a) digestion of a mixture of nickel and cobalt compounds in a solution containing hydrochloric acid having a concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is solid; or bringing the mixture of nickel and cobalt compounds to a hydrochloric acid concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is a solution; b) activation of ion-exchange resin in a column using hydrochloric acid; c) passing the solution from step a) through the column filled with the ion-exchange resin activated in step b); d) washing the column with hydrochloric acid having a concentration of more than 25 mass % in order to wash out the remaining solution containing nickel ions; e) washing the column with hydrochloric acid having a concentration of less than 10 mass % in order to wash out cobalt ions; f) extraction distillation of the nickel ion solution obtained in step d) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of nickel sulfate(VI) and electrolysis in order to recover metallic nickel; g) extraction distillation of the cobalt ion solution obtained in step e) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of cobalt sulfate(VI) and electrolysis in order to recover metallic cobalt; h) extraction distillation of the solution of diluted hydrochloric acid with nickel and cobalt ions obtained after the activation of the ion-exchange resin in step b), using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; recycling of a mixture of the formed cobalt sulfate(VI) and nickel sulfate(VI) to digestion in step a); i) rectification of diluted hydrochloric acid having a concentration below the azeotropic concentration (approx. 20.2 mass % at atmospheric pressure) formed in extraction distillation processes in steps f)-h) in order to concentrate hydrochloric acid and recover and recycle of water; recycling of concentrated hydrochloric acid to extraction distillation in steps f)-h).

The invention relates to a high-Ni alloy flux-cored wire for 9% Ni steel welding, which is prepared by coating a flux core with a nickel-based steel strip, and the flux core comprises the following components in percentage by weight: 18.0-30.0% of metal nickel powder, 5.0-8.0% of metal chromium powder, 5.0-9.0% of metal molybdenum powder, 1-2% of metal tungsten powder, 20.0-30.0% of rutile, 1.0-3.0% of quartz, 2.0-5.0% of albite, 1.0-3.0% of potassium feldspar, 0.5-3.0% of mica, 1.0-4.0% of cryolite, 0.2-0.8% of self-made raw material and the balance of reduced iron powder and inevitable impurities. The flux-cored wire belongs to a hastelloy system and is particularly suitable for welding of horizontal position welding and vertical position welding of the marine LNG storage tank, the mechanical performance of cladding metal of the flux-cored wire can reach 50 J or above at the low-temperature impact of-196 DEG C, the tensile strength is larger than 700 MPa, and the flux-cored wire is excellent in crack resistance and comprehensive performance.

The invention relates to the field of advanced ceramic materials, in particular to a ceramic matrix composite (CMC) and a preparation method thereof. The technical problems that a traditional CMC preparation technology is long in period, poor in structural uniformity and insufficient in toughness are solved. According to the method, surface-modified aluminum oxide ceramic microspheres are used as reinforcements, the surfaces of the microspheres are sequentially modified with hexagonal boron nitride nanosheets and a metal nickel catalyst, the microspheres, silicon carbide nanoparticles and a polycarbosilane precursor are mixed to form slurry, and a complex component is formed through multi-material additive manufacturing. A green body is prepared by using a 3D printing technology combining photocuring and material extrusion; carrying out ultraviolet curing on the green body, and carrying out staged heat treatment in an inert atmosphere, so that the precursor polymer is subjected to cross-linking curing, and meanwhile, carbon nanowires grow through in-situ catalysis; and finally, sintering under a pressurizing condition to realize matrix densification. The preparation period is greatly shortened, and the obtained composite material is uniform in structure, compact in matrix and excellent in mechanical property.

The invention provides an alkaline electrolytic water hydrogen evolution reaction nickel-based electrode and a preparation method and application thereof, and belongs to the technical field of catalyst materials. The alkaline electrolytic water hydrogen evolution reaction nickel-based electrode has a monatomic-nanocluster-nanoparticle-support multilevel structure, the multilevel structure takes a metal nickel net as a support, nickel is loaded on the metal nickel net in the form of particles, molybdenum oxide is dispersed on the nickel particles in the form of clusters, and the metal nickel net is supported on the support. The preparation method comprises the following steps: preparing molybdenum oxide clusters, anchoring platinum on the molybdenum oxide clusters in the form of single atoms, loading nickel particles on a metal nickel net by utilizing a plasma spraying method, generating the molybdenum oxide clusters on the nickel particles through thermal annealing treatment, and then loading platinum single atoms on the molybdenum oxide clusters by utilizing an electrodeposition method, therefore, the nickel-based electrode for the hydrogen evolution reaction of the alkaline electrolyzed water is obtained. According to the invention, the hydrogen evolution reaction electrode with a multi-stage structure is prepared from a microreaction mechanism for the first time, the preparation cost is low, industrial production can be realized, and the hydrogen evolution reaction electrode can be applied to industrial hydrogen production.

The invention provides base metal main grid slurry, a preparation method thereof and a photovoltaic cell. The base metal main grid slurry comprises 3-8 parts by mass of nickel powder, and the surface of the nickel powder is coated with a modified component; 0.5-1 part by mass of first glass powder; 0.5 to 1.5 parts by mass of second glass powder; 13-16 parts by mass of an organic phase; 0.2 to 0.5 part by mass of an organic auxiliary agent; 15-25 parts by mass of a first silver powder; and 45-60 parts by mass of a second silver powder. The base metal nickel is used for replacing part of silver powder, the wettability is improved through surface coating, meanwhile, glass elements are optimized, the glass softening point is reduced, the paste can be sintered at the low temperature, close combination of silver particles is facilitated, and the density and conductivity of a conducting layer are improved. According to the technical scheme, the sintering is compact, the conductivity is slightly higher than that of pure silver paste, and the effects that the efficiency is equal to that of the silver paste and the tension is slightly lower than that of the pure silver paste are achieved.

The invention relates to the field of electroplating of threaded couplings, in particular to an electroplating nickel-tungsten alloy process for a threaded coupling. The nickel-tungsten alloy electroplating technology for the threaded coupling comprises the following steps that S1, activating treatment is conducted; s2, nickel pre-plating treatment; s3, copper plating treatment; s4, nickel-tungsten alloy plating treatment; s5, tinned copper treatment; and S6, passivating treatment is conducted. According to the composite electroplating technology for the threaded coupling, the abrasion resistance and corrosion resistance of the threaded part are improved through multi-stage coating superposition. Bottom-layer metal nickel is formed through nickel pre-plating treatment, and the binding force of a base body and a plating layer is enhanced; the copper plating layer can improve the ductility of the plating layer and reduce internal stress; the nickel-tungsten alloy layer improves the hardness and high-temperature stability of the plating layer; the tinned copper layer further prevents extrusion deformation of the threads, reduces the friction coefficient and prevents thread gluing; a compact oxidation film is formed through passivating treatment, and the color change phenomenon on the surface is prevented. And the service life of the coupling under the working conditions of high pressure and high friction is obviously prolonged.

The invention provides a lithium battery valuable metal separation and recovery method based on multi-stage synergistic extraction. The method comprises the following steps: obtaining an electrode material from a waste lithium battery, and crushing and roasting the electrode material; carrying out multi-stage extraction on the roasted electrode material, and sequentially carrying out lithium element extraction, cobalt and nickel element extraction and manganese element extraction; and carrying out back extraction, separation and metal recovery on the lithium-containing organic phase, the cobalt-nickel-containing organic phase and the manganese-containing organic phase obtained by the multi-stage extraction to respectively obtain lithium carbonate, metal cobalt, metal nickel and manganese dioxide. According to the method, a multi-stage synergistic extraction process is adopted, a specific extraction agent and optimized extraction conditions are selected according to the properties of different valuable metals in the lithium battery, and the valuable metals are extracted in a graded and coordinated manner in combination with a pi-pi conjugated amphiphilic dissolution aid, so that the valuable metals such as lithium, cobalt, nickel, manganese and the like are efficiently separated and recycled, and the resource utilization rate is effectively increased.

The invention discloses an all-component comprehensive utilization method for limonite type laterite-nickel ore, and belongs to the technical field of mineral processing and metallurgy. According to the method, multi-stage preheating and selective reduction are combined, accurate regulation and control of ore phase conversion are achieved by optimizing temperature and atmosphere conditions, metallic nickel and cobalt generated through reduction form a stable complex in the ammonia leaching process, and magnetite serves as an indissolvable magnetic phase to be left in slag. The reaction temperature is effectively reduced, the energy consumption is reduced, and the gas-solid mass transfer efficiency and the heat transfer efficiency are remarkably improved. The mineral structure is regulated and controlled through selective reduction, the adverse effects of excessive reduction, sintering, follow-up leaching difficulty and the like of iron oxide in the high-temperature roasting process of a traditional rotary kiln are avoided, and efficient selective leaching of nickel and cobalt and recovery and enrichment of magnetic iron ore are achieved. And meanwhile, the nickel and cobalt leaching efficiency is remarkably improved, interference of iron impurities on a leaching solution is reduced, and an economical and feasible new technical path is provided for resource comprehensive utilization and green metallurgy development of the limonite type laterite-nickel ore.

The invention belongs to the technical field of catalysts, and relates to a cerium oxide supported nickel catalyst and a preparation method and application thereof, and the catalyst is composed of a metal nickel active component and a cerium oxide carrier. The cerium oxide prepared by adopting a reversed-phase microemulsion method is dispersed in a nano-scale manner, has a large specific surface area and abundant oxygen vacancies on the surface, can realize high dispersion of metal nickel after loading nickel on the cerium oxide, has relatively high stability, and is beneficial to realizing efficient methanation of carbon dioxide hydrogenation. By changing the preparation conditions of the reversed-phase microemulsion, the number of oxygen vacancies on the surface of the catalyst can be effectively adjusted, and the CO2 hydrogenation reaction performance of the catalyst is regulated and controlled. The cerium oxide supported nickel catalyst prepared by the invention has the CO2 conversion rate of 83% and the CH4 selectivity of 97%, and shows excellent CO2 conversion rate and methane selectivity, which indicates that the cerium oxide-containing catalyst provided by the invention has excellent CO2 hydrogenation performance, shows excellent catalytic activity, product selectivity and stability, and can be used for preparing a catalyst for hydrogenation of CO2. And large-scale industrial application can be realized.

The invention relates to a transition metal nickel monatomic difunctional electrocatalyst and a preparation method and application thereof, and belongs to the technical field of carbon dioxide electrolysis. The catalyst takes a transition metal nickel monatomic as an active component, the loading capacity of the active component is 2-5wt.%, a nitrogen-doped carbon material is taken as a carrier, and the microstructure of the carrier is a rhombic dodecahedron with the particle size of 100-200nm. The difunctional electrocatalyst used in the invention has excellent double functions of carbon dioxide electroreduction and sulfur dioxide electrooxidation activity, is applied to the constructed novel carbon dioxide electrolysis system, has lower electric energy consumption and operation cost compared with the traditional electrolysis system, and has huge application potential.

The invention discloses a metal oxide / carbon / nickel composite material, a preparation method and application of the metal oxide / carbon / nickel composite material to a magnesium-based hydrogen storage material, and belongs to the field of hydrogen storage energy. The problems that a single-component catalyst in the MgH2 hydrogen storage material is low in active site, the interface is inactivated in the circulation process and the like are solved. A metal nickel source and a cerium source are combined with an organic ligand trimesic acid to form bimetal MOF, CeO2 / C / Nix obtained after calcination inherits the high specific surface area of MOF, metal is evenly dispersed in a carbon matrix, CeO2 / C / Nix is introduced into MgH2, microscale efficient catalysis of MgH2 is achieved, when the doping amount of CeO2 / C / Ni20 is 8 wt.%, the initial dehydrogenation temperature is 188.23 DEG C, and when the doping amount of CeO2 / C / Ni20 is 8 wt.%, the initial dehydrogenation temperature is 188.23 DEG C, and the specific surface area of CeO2 / C / Nix is 27.8 wt.%. After 10 cycles, the capacity retention rate is 98.8%, excellent hydrogen storage performance is shown, and a unique insight is provided for large-scale production of the magnesium-based hydrogen storage material.

The invention relates to the technical field of nano material preparation and application, in particular to a transition metal selenide catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, metal nickel salt, ferric salt, urea and ammonium fluoride are dissolved in deionized water, and a nickel-iron layered hydroxide nanosheet precursor is synthesized through a hydrothermal method; secondly, preparing an iron-doped nickel selenide catalyst by adopting a selenylation reaction; the electronic structure of nickel selenide is regulated and controlled by utilizing an iron doping strategy, and the catalytic performance is improved. The prepared iron-doped nickel selenide catalyst has good catalytic activity when being used for hydrogen evolution reaction and sulfur ion oxidation reaction. In a two-electrode sulfur ion oxidation coupling hydrogen production electrolytic tank, the current density of 10mAcm <-2 > can be output only by the voltage of 0.439 V, and the targets of efficient and energy-saving hydrogen production and sulfur ion oxidation upgrading into a high-added-value elemental sulfur product are achieved. The method has the advantages of simple and controllable preparation process, low raw material price, easiness in batch production and the like, and can be used as a catalyst for efficient water electrolysis hydrogen production and sulfur ion oxidation reaction.

The invention belongs to the technical field of hydrogen evolution catalysts, and particularly relates to an amorphous metal hydrogen evolution catalyst, a preparation method and application. The preparation method comprises the steps that metal nickel serves as a working electrode, binary alloy powder of different proportions serves as a precursor, the binary alloy powder is sprayed to the surface of the metal nickel, and a first intermediate electrode is obtained; reducing the binary alloy powder on the surface of the metallic nickel into metal to obtain a second intermediate electrode; taking the second intermediate electrode as a substrate to obtain a metallic nickel loaded binary metal / amorphous metal electrode; the binary metal / amorphous metal loaded on the metallic nickel in the metallic nickel loaded binary metal / amorphous metal electrode is the amorphous metal hydrogen evolution catalyst. The problems that an existing hydrogen evolution catalyst is high in cost, poor in hydrogen evolution catalytic activity and low in stability are solved, the prepared amorphous metal hydrogen evolution catalyst has excellent hydrogen evolution catalytic activity and long-time stability, and the excellent hydrogen production effect can be achieved in the electro-catalysis hydrogen evolution process.

The invention discloses a preparation method of a nickel-boron intermediate alloy for a nickel-based superalloy, which comprises the following steps: step 1, mixing boric anhydride powder and nickel protoxide powder, pressing to obtain a pre-combination reaction block, mixing metallic nickel and carbon powder, and pressing to obtain a thermal reduction reaction block; 2, the pre-combination reaction block is heated to be molten to obtain a molten product, then the molten product and the thermal reduction reaction block are mixed for a carbon thermal reduction reaction, and an alloy melt is obtained; 3, casting the alloy melt under a vacuum condition, and cooling to obtain a nickel-boron intermediate alloy; the invention further discloses a preparation device of the nickel-boron intermediate alloy for the nickel-based high-temperature alloy. According to the preparation method disclosed by the invention, the pre-chemical combination and carbon thermal reduction processes are adopted, so that the formation of a boron-rich phase is effectively inhibited, the fluctuation increase and non-uniform distribution of the boron element content are avoided, a guarantee is provided for the subsequent proportioning link of the nickel-based high-temperature alloy, and the preparation method is suitable for the technical field of intermediate alloy preparation.

The invention discloses a flexible lithium metal negative electrode framework material and a preparation method and application thereof, and belongs to the field of lithium metal battery materials, and the framework material is a nickel oxide modified three-dimensional carbon fiber framework; the nickel oxide particles are uniformly anchored in the three-dimensional carbon fiber frame, and the interior of the three-dimensional carbon fiber frame is communicated and is three-dimensionally porous; according to the preparation method, firstly, hydrochloric acid is used for cleaning and acidifying a carbon fiber skeleton, then a three-electrode method is used for electro-deposition of a metal nickel layer on the surface of the carbon fiber skeleton, finally, carbon fibers covered with the metal nickel layer are subjected to heat treatment to generate nickel oxide nano-particles, and the nickel oxide nano-particles have good flexibility and machining performance. The flexible lithium metal negative electrode loaded with the lithium metal is light in weight, high in energy density and large in specific surface area, and can adapt to severe volume change in the cycle process, so that the coulombic efficiency of the lithium metal negative electrode is improved, and the cycle life of the lithium metal negative electrode is prolonged.

The invention discloses an efficient ozone decomposition catalyst suitable for a high-humidity environment and a preparation method and application thereof, and belongs to the technical field of catalytic chemistry and environmental governance. The catalyst is prepared by the following steps: mixing a solution containing a manganese source and a nickel source, adding an alcohol reducing agent for reaction, and calcining the obtained product to obtain metallic nickel doped manganese dioxide; the manganese dioxide doped with the metallic nickel is obtained by acidizing and etching. The ozonolysis catalyst prepared by the method has excellent ozonolysis performance, the preparation method is simple, the specific surface area is large, the water resistance is strong, the long-term stability is good, and the application prospect is wide.

This invention relates to the field of water electrolysis and hydrogen energy utilization technology, and provides an in-situ electrodeposition method for improving NiMoP. x O y A method for studying the catalytic activity and stability of a self-supporting nickel-based hydrogen evolution electrode (NMOP). First, NiMoP... x O y The / NF self-supporting foam nickel-based electrode is prepared by immersing it in a nickel salt solution for a certain period of time, drying it, and then immersing it in a sodium sulfate solution for electrodeposition reduction reaction. This invention provides a simple and convenient method for adjusting the amount of metallic nickel deposited, ensuring its distribution among the active component particles of the electrode. This effectively improves the adhesion of the active component and prevents its detachment, significantly enhancing the hydrogen evolution activity and stability of the hydrogen evolution electrode. At an industrial current density of 100 mA / cm², the overpotential of the modified electrode prepared by this method is reduced by approximately 20% compared to the unmodified electrode, and the charge transfer resistance is reduced by approximately 41%. After 30,000 CV cycle accelerated durability tests, the increases in overpotential and charge transfer resistance are less than 7% and 26% of those of the unmodified electrode, respectively. Therefore, this invention has promising prospects for industrial application.

This invention belongs to the field of metal powder preparation technology, and discloses a porous nickel powder, its preparation method, and its applications. The method includes: preparing nickel oxalate powder as a precursor; forming a nickel coating layer on the surface of the nickel oxalate powder by chemical plating to obtain nickel oxalate@nickel core-shell structured composite particles; subjecting the composite particles to pyrolysis annealing treatment, causing the internal nickel oxalate to decompose and generate gas, and the external nickel coating layer to transform into a porous metal framework, thereby obtaining porous nickel powder. This method is simple, low-cost, and produces nickel powder particles with uniform size, stable pore structure, good connectivity, and large specific surface area, making it suitable as a precursor for electrocatalytic active materials or porous electrode materials.

This invention discloses a transition metal phosphide catalyst, its preparation method, and its application, belonging to the field of electrocatalysis technology. The process includes: firstly, dissolving nickel salt, lanthanum salt, urea, and ammonium fluoride in deionized water to synthesize a nickel-lanthanum layered hydroxide nanosheet precursor via a hydrothermal method; secondly, preparing a lanthanum-doped nickel phosphide catalyst using a phosphating reaction; and thirdly, utilizing a lanthanum doping strategy to modulate the electronic structure of nickel phosphide and improve its electrocatalytic reaction performance. This lanthanum-doped nickel phosphide material exhibits good catalytic activity when used to catalyze hydrogen evolution and sulfide ion oxidation reactions. In an integrated two-electrode electrolyzer for sulfide ion oxidation-assisted hydrogen production, it outputs 10 mA cm⁻¹. ‑2 This invention achieves the goal of producing hydrogen and high-value-added sulfur products with low energy consumption by requiring a relatively low voltage of 0.525 V at a current density. It has advantages such as simple preparation process, controllable operating conditions, and low raw material costs, possessing the potential for large-scale production and serving as a high-performance catalyst for electrocatalytic hydrogen production and sulfur ion oxidation reactions.

The invention belongs to the technical field of environmental science and water treatment, and particularly relates to a PLA-Ni-coated MOF composite membrane and a preparation method and application of the PLA-Ni-coated MOF composite membrane. Comprising a porous polylactic acid substrate film constructed by 3D printing, a metal nickel layer arranged on the surface of the polylactic acid substrate film, and a ZIF-8 nanoparticle layer arranged on the surface of the metal nickel layer, the metal nickel layer is arranged between the polylactic acid substrate film and the ZIF-8 nanoparticle layer. The PLA-Ni-coated MOF composite membrane has a three-stage hierarchical composite structure of a PLA substrate membrane, a nickel coating and a ZIF-8 particle layer, is stable in structure and excellent in performance, has good mechanical strength and acid and alkali resistance stability, and is suitable for large-scale industrial oil-water separation.