1000 results about "Galvanic deposition" patented technology

The invention relates to an electrode preparation method, an electrode prepared by the method, an energy storage device comprising the electrode and an electrode production system for carrying out the method. The preparation method comprises the following steps: (a) providing a self-supporting electrode film which comprises a first side and a second side opposite to the first side, and the second side comprises a to-be-deposited area on which metal is deposited when the self-supporting electrode film is in contact with an electrolyte for an electrodeposition reaction; (b) providing an electrolyte containing a salt of a metal to be deposited; and (c) contacting at least the region to be deposited of the second side of the self-supporting electrode film with the electrolyte, and performing an electrodeposition reaction in the region to be deposited, thereby depositing a current collector of the metal to be deposited on the second side, where the electrodeposition temperature is 0 to 70 DEG C. According to the electrode prepared by the method disclosed by the invention, the active substance in the electrode has excellent first discharge specific capacity, first coulombic efficiency and cycle performance.

The invention relates to the technical field of corrosion resistance, in particular to a corrosion-resistant and wear-resistant copper insert and a preparation method thereof.The copper insert is subjected to plating treatment in an ionic liquid electroplating mode, then the surface of a plating layer is subjected to hole sealing treatment, and a nickel-copper-composite halloysite nanotube layer is electrically deposited on the surface of the formed copper insert; the preparation method comprises the following steps: taking a halloysite nanotube as a nano loader of a corrosion inhibitor, and coating with dopamine to obtain a composite halloysite nanotube; in the hole sealing liquid, the composite halloysite nanotube is used as a filler, silane modified polyurethane is used as a base material, the silane modified polyurethane is a prepolymer synthesized by using isophorone diisocyanate and polytetramethylene ether glycol as raw materials, octylamine ring-opened 3-(2, 3-epoxypropoxy) propyltrimethoxysilane is used as a chain extender, and the silane modified polyurethane is used as the base material. And 2-(perfluorodecyl) ethanol and aminopropyltriethoxysilane are used as end-capping reagents, so as to prepare the high-temperature-resistant coating.

The invention discloses a preparation method of a zinc phthalocyanine doped PANI coating on the surface of a metal bipolar plate. The preparation method comprises the following steps of pretreatment of the surface of the bipolar plate, preparation of an electroplating solution, an electro-deposition process and a post-treatment process. According to the preparation method of the zinc phthalocyanine doped PANI coating on the surface of the metal bipolar plate, the functional composite coating which is compact in structure, excellent in conductivity and outstanding in corrosion resistance is prepared by accurately controlling the doping concentration of zinc phthalocyanine and electro-deposition process parameters in the electroplating solution, and the energy efficiency and the service life of a water electrolysis hydrogen production device and a fuel cell system are improved.

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 technical field of rotational flow electro-deposition, in particular to a process for treating metal-containing waste liquid by adopting a rotational flow electro-deposition technology, which comprises the following steps: removing particulate matters from the metal-containing waste liquid through a filtering device, and then recycling metal from the filtered metal-containing waste liquid through a rotational flow electro-deposition device. The rotational flow electro-deposition device comprises an electrolytic tank body, an anode shell and a plurality of cathode columns rotating synchronously, waste liquid forms rotational flow under the action of a spiral diversion trench, and metal ions are efficiently deposited on the surface of a cathode. By adopting the spiral diversion trench and the synchronously rotating cathode column structure, the waste liquid forms rotational flow in the electrolytic bath, so that the electrodeposition area of the cathode is increased, the uniform deposition of metal ions is promoted, the metal recovery efficiency and purity are improved, the manual operation intensity is greatly reduced through the cooperative control of the motor, the electric cylinder and the vacuum pump, and the production cost is reduced. The automation level of the process is improved, and the maintenance time of the cathode column is shortened.

The invention discloses a preparation method of an ultra-thin copper foil with a carrier, and belongs to the technical field of copper foil manufacturing. The method comprises the steps that S1, a titanium plate is adopted as a cathode, an iridium-plated titanium plate is adopted as an anode, the washed titanium plate is immersed in a copper electroplating solution at the temperature of 30-70 DEG C, and after electro-deposition is conducted, a carrier copper foil is prepared; s2, immersing the carrier copper foil prepared in the step S1 into an organic solution containing ionic liquid for adsorption to obtain a carrier copper foil with a stripping layer; and S3, taking the carrier copper foil with the stripping layer prepared in the step S2 as a cathode, carrying out water washing treatment, then immersing the carrier copper foil into another copper electroplating solution at the temperature of 30-70 DEG C, and carrying out electro-deposition by taking an iridium-plated titanium plate as an anode, so as to prepare the ultra-thin copper foil. The ultrathin and uniform single organic stripping layer is prepared in an organic adsorption mode, the method is simple in preparation process, and the stripping layer enables the ultrathin copper foil to be stably and completely stripped from the carrier copper foil by regulating and controlling the binding force between the carrier copper foil and the ultrathin copper foil.

The invention relates to a preparation method of a high-performance catalytic electrode material for hydrogen production by electrolysis of water and the catalytic electrode material.The preparation method comprises the steps that firstly, a conductive substrate is pretreated to remove impurities, and then an electroplating solution containing a nickel source, a pore forming agent, an iron source and a cerium source is prepared; during electro-deposition, a one-step deposition method takes a pretreated nickel net as a cathode and a nickel rod as an anode, and constant voltage of 1V-10V is applied for 5-30 minutes at the temperature of 20-60 DEG C; according to the two-step deposition method, a nickel-iron electrode substrate is prepared on a nickel net substrate, and then nickel-iron-cerium is deposited. And sintering for 1-30 seconds at the temperature of 600-1000 DEG C in a protective atmosphere after post-treatment to obtain the product. Compared with the prior art, the activity and stability are improved through Ce redox couple and oxygen vacancy, the water electrolysis hydrogen production reaction is accelerated, the method has the advantages of being excellent in performance, flexible in preparation and the like, and powerful support is provided for efficient production of hydrogen energy.

The invention relates to a preparation technology of an electrochemical catalytic material, and aims to provide a method for preparing an electrode material through pulse electrodeposition and application of the electrode material in an oxygen evolution reaction. The method comprises the following steps: constructing a dual-electrode electrolysis system, and co-depositing transition metal ions and selenium ions on a working electrode by adopting a pulse electrodeposition method to form a catalyst layer containing transition metal and selenide; then the working electrode is used for building an electrochemical system, electrochemical activation treatment is conducted on the working electrode through cyclic voltammetry, a selenium phase is induced to fall off, porous metal oxide is formed by reconstructing the surface of a catalyst layer, and the electrode material for the water electrolysis oxygen evolution reaction is obtained. The selenium phase is induced to fall off through electrochemical activation to form a porous metal oxide structure, the specific surface area is remarkably increased, rich oxygen vacancies are formed, the electronic structure is optimized, more active sites are exposed, and the catalytic activity is improved; the method is easy to operate, high in parameter controllability, free of high-temperature and high-pressure equipment and suitable for large-scale production.

The invention discloses a preparation method and application of a nickel-doped lead dioxide ozone catalytic anode, a titanium substrate is used as an anode, a titanium sheet is used as a cathode for anodic oxidation, an obtained titanium dioxide nanotube array is used as an anode, a titanium sheet is used as a cathode for secondary anodic oxidation, and the nickel-doped lead dioxide ozone catalytic anode is obtained. And putting the obtained titanium dioxide nanotube array electrode of the new oxide layer into a tubular furnace, calcining in an air atmosphere, taking the titanium dioxide nanotube array electrode of the transition layer as a cathode, taking a titanium plate as an anode, and performing electrochemical reduction in a formic acid solution to obtain the titanium dioxide nanotube array electrode of the transition layer. The obtained electrode with the high-conductivity titanium dioxide nanotube array transition layer serves as an anode, a titanium sheet serves as a cathode, electrodeposition is carried out in an acid electrodeposition solution to obtain a beta-PbO2 layer, and finally the Ti / TNAs / Ni-PbO2 anode is prepared, the anode is high in stability and long in service life and can work for a long time without affecting the catalytic activity of the anode, and the application range of the Ti / TNAs / Ni-PbO2 anode is wide. The method has a certain application prospect in the aspect of electro-catalytic ozone treatment of organic wastewater.

The invention discloses a preparation method and application of a zinc-bromine flow battery positive electrode material, and belongs to the field of zinc-bromine flow batteries. The preparation method comprises the following steps: firstly, cleaning and activating a carbon-based three-dimensional conductive network substrate by adopting plasmas, performing oxygen / argon plasma etching, and performing chemical vapor deposition on carbon to prepare three-dimensional porous carbon; then growing a metal oxide nanocrystalline array on the three-dimensional porous carbon by a hydrothermal method, and carrying out ammonia gas calcination to convert the metal oxide nanocrystalline array into a metal nitride nanocrystalline array; then preparing an electro-deposition solution containing tin bismuth salt and an aniline-bromine source polymerization solution, and constructing Sn-Bi bimetallic nanoparticles and a polyaniline-bromine complex layer on the metal nitride nanocrystalline array / three-dimensional porous carbon precursor through electro-deposition and electro-polymerization in sequence to finally prepare the high-performance zinc-bromine battery positive electrode material. The positive electrode material has high conductivity, excellent Br2 / Br <-> catalytic activity and structural stability, and the coulombic efficiency, the voltage efficiency and the energy efficiency of the battery are remarkably improved.

The invention relates to the technical field of electrolytic copper foil processing, and particularly provides a method for reducing the rough surface roughness of an HVLP copper foil by using a composite additive, which comprises the following steps: step (1): enabling the composite additive to flow into a high-level tank through an additive flow pump, uniformly mixing the composite additive with a copper sulfate electrolyte, and enabling the mixture to flow into a crude foil machine; step (2), then adjusting process parameters of a crude foil machine, including current and line speed of a cathode roller; (3) foil generation and foil drawing are carried out; the composite additive comprises one or two of gelatin and collagen. One or more composite additives composed of gelatin, collagen, sodium dithiodipropane sulfonate, N, N-dimethyl-dithioformamide sodium propanesulfonate, 3-sulfydryl-1-sodium propane sulfonate, hydroxyethyl cellulose and polyethylene glycol are added into the raw foil electrolyte, so that the copper electrodeposition reaction potential can be effectively changed; and uniform and compact copper crystallization peaks are obtained, the rough surface roughness of the raw foil is reduced, and the uniformity of a plating layer is improved.

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 a preparation method of an aperture-adjustable and metal-loaded graphite felt flow battery electrode, which comprises the following steps: (1) pretreatment and pore separation: mixing a graphite felt with an alkali solution, magnetically stirring, heating, cooling to room temperature, and treating again to obtain a pore separation material; (2) loading neodymium oxide: dipping the porous material in a solution containing neodymium salt and polyamino acid, heating, cleaning, and drying to obtain a neodymium oxide modified electrode material; (3) loading oxygen-deficient CoMnOx: coating the mixed slurry containing manganese and cobalt on an electrode plate, heating, cleaning and drying to obtain an oxygen-deficient CoMnOx loaded electrode; and (4) carrying out electro-deposition on the electrode loaded with the oxygen defect CoMnOx to obtain the novel bismuth-deposited graphite felt electrode. According to the electrode product obtained through the method, the energy efficiency is improved to 85% or above, and the stable cycle index for maintaining the energy efficiency can exceed 1440 times.

The present invention relates to the technical field of electrodeposition, and relates to a simulation method for flow field distribution and deposition morphology in ultrafast laser-assisted electrochemical deposition. The steps of the method comprise: constructing, in multiphysics simulation software, a two-dimensional axisymmetric multiphysics coupled field model for heat transfer, solid and fluid heat transfer, tertiary current distribution, and laminar flow; constructing a geometric model of a deposition cell and a substrate, and setting laser properties, material physical parameters, and electrodeposition properties in the multiphysics simulation software; constructing an ultrafast laser heat transfer model on the basis of a two-temperature equation; setting initial and boundary conditions of the ultrafast laser heat transfer model, and constructing an electrodeposition field; coupling the ultrafast laser heat transfer model with the electrodeposition field to construct an ultrafast laser-assisted electrochemical deposition model; delineating a grid; and performing calculation and analysis. In the present invention, ultrafast laser is incorporated to perform multiphysics coupling of a thermal field, a flow field, an electric field, etc., and a two-temperature equation and tertiary current distribution are incorporated to the model, thereby achieving the accuracy and comprehensiveness of prediction models.

The invention relates to a preparation method of an electrolytic nickel-iron-copper alloy foil, which comprises the following steps: dissolving corresponding salt of an alloy in dilute sulphuric acid, realizing metal coprecipitation through a complexing agent and regulating and controlling the pH value of an electrolyte, and uniformly distributing the metal content of the alloy foil. The mechanical property of the alloy foil is controlled by adopting an additive, and the nickel-iron-copper alloy foil is obtained through direct-current electrolytic electrodeposition. According to the invention, the problems of high cost, complex production process, non-uniform thickness, easy generation of holes and the like, which are caused by a plurality of working procedures in the traditional mechanical rolling method, are solved, and the problems of low tensile strength of the traditional pure copper foil at normal temperature and unstable tensile strength after high-temperature aging are solved; and the problem of thin surface cracking caused by non-uniform metal components of the alloy foil is solved, and the corrosion resistance of the foil layer is improved.

The invention belongs to the technical field of new energy and electrochemistry, and particularly relates to a corrosion-resistant structured transition metal alloy electrode suitable for hydrogen production from alkaline water and a preparation method of the corrosion-resistant structured transition metal alloy electrode. The method comprises the following steps: sequentially carrying out sand blasting treatment and electrochemical activation treatment on a nickel net substrate so as to improve the surface roughness and the number of active sites; and then performing constant-current deposition in an electro-deposition solution containing nickel salt and ferric salt and / or cobalt salt, and constructing a nickel-based alloy catalyst layer in a micron array shape to obtain the alloy electrode. Through observation of a scanning electron microscope, the surface of the obtained electrode has a sphere-like microstructure, the arrangement is compact, and the catalytic efficiency and durability can be improved. The prepared structured alloy electrode has the advantages of being high in interface bonding force, high in electro-catalytic performance, high in alkali corrosion resistance and the like, and is suitable for efficient and long-term operation of hydrogen production through alkaline electrolysis of water.

The invention belongs to the technical field of surface engineering protective coatings, and discloses a nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating as well as a preparation method and application thereof. The preparation method comprises the following steps that firstly, a magnetron sputtering technology is adopted, a CoCrFeMnNi target serves as a cathode target material, and a corrosion-resistant high-entropy alloy coating is obtained through deposition on the surface of a base body; and then, in a three-electrode system, the corrosion-resistant high-entropy alloy coating is placed in an electrolyte containing a nitrogen heterocyclic onium salt compound to be subjected to electro-deposition, and the nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating is prepared. The corrosion-resistant inorganic-organic hybrid coating prepared by the invention has excellent corrosion resistance, can keep high stability and durability in a complex corrosion environment, and has relatively high corrosion potential and relatively low corrosion current density. The coating can remarkably prolong the service life of a structural base material, is suitable for various harsh working conditions, and provides an efficient and reliable protection solution for industrial application.

The invention discloses high-strength stainless steel for a wheel hub cover and a machining process of the high-strength stainless steel, and relates to the technical field of stainless steel machining. The specific processing technology comprises the following steps: weighing a stainless steel raw material, smelting under nitrogen pressurization, carrying out protective pouring to obtain a cast ingot, carrying out hot forging and hot rolling to obtain a hot-rolled plate, carrying out solution treatment and water quenching, sequentially carrying out multi-pass cold rolling and single-pass liquid nitrogen heat preservation cold rolling, annealing and aging treatment to obtain a stainless steel base material, and sequentially carrying out grinding, polishing, oil removal and acid activation to obtain the stainless steel plate. And then placing in an electroplating solution for electro-deposition of an alloy plating layer, cleaning after electro-deposition is finished, then carrying out laser cladding, finally carrying out heat treatment, and cutting a thin layer to obtain the high-strength stainless steel. Wherein cladding powder adopted for laser cladding comprises cobalt powder, chromium powder, nickel powder, aluminum powder, molybdenum powder, titanium powder, zirconium powder, nano carbon-nitrogen metal and tungsten carbide.

The invention discloses a carbon felt electrode for a zinc-bromine flow battery as well as a preparation method and application, and belongs to the technical field of zinc-bromine flow battery production, the method comprises the following steps: immersing a carbon felt into an acid solution for chemical etching, etching uniform grooves in the carbon fiber surface of the carbon felt, cleaning and drying to obtain a pretreated carbon felt; the preparation method comprises the following steps: dissolving tin salt and nickel salt in deionized water, and adding a hydrolysis inhibitor to obtain a precursor solution; and immersing the pretreated carbon felt into the precursor solution, carrying out electro-deposition under constant current by adopting a direct-current power supply by taking the re-selected untreated carbon felt as a counter electrode, washing the pretreated carbon felt subjected to electro-deposition with water, and drying for the second time to obtain the carbon felt electrode for the zinc-bromine flow battery. By utilizing the zinc affinity of Sn and Ni, zinc is preferentially deposited on Sn and Ni sites of the carbon felt electrode, the deposition depth is obviously enlarged, the zinc deposition space is optimized, the zinc deposition area capacity is effectively improved, and the problem that the surface capacity of the carbon felt electrode is limited is solved.

The invention discloses an efficient NiMo-Co MOF alkaline electrolysis water electrode and a preparation method thereof.The efficient NiMo-Co MOF alkaline electrolysis water electrode comprises a nickel net, a NiMo deposition layer deposited on the nickel net and a Co MOF deposition layer deposited on the NiMo deposition layer, and during preparation, the nickel net is pretreated firstly; dissolving a nickel salt, a molybdenum salt, a conductive salt and a complexing agent in water to obtain a NiMo electro-deposition solution; the method comprises the following steps: dissolving cobalt salt and a ligand in a mixed solution of DMF and water to obtain a Co MOF electro-deposition solution; the pretreated nickel net is placed in a NiMo electro-deposition solution for constant-current deposition, and a NiMo electrode with a NiMo deposition layer loaded on the nickel net is obtained; the NiMo electrode is placed in the Co MOF electro-deposition solution for constant-voltage deposition, and the NiMo-Co MOF composite electrode with the Co MOF deposition layer loaded on the NiMo electrode is obtained. The method is simple and easy to control, low in preparation cost and good in electrode stability and hydrogen production effect.

The invention belongs to the technical field of carbon nanomaterials, and particularly relates to a highly graphitized carbon tube grid of a scaffold-like structure and a preparation method and application of the highly graphitized carbon tube grid. The preparation method comprises the following steps: taking aluminum oxide with interconnected pore channels inside as a template, and obtaining a three-dimensional interconnected nickel nanorod grid film through an electro-deposition method; by utilizing the catalytic graphitization property of metal nickel and regulating and controlling parameters of acetylene when the acetylene is decomposed on the surface of the metal nickel, the problem that three-dimensional highly-graphitized carbon with controllable morphology and size cannot be synthesized due to nickel deformation caused by a catalytic mechanism is solved, and the highly-graphitized carbon tube grid with a scaffold-like structure is obtained; and the crystallinity of the carbon tube grid film is effectively improved at a relatively low temperature. The preparation process is simple, feasible and environment-friendly, and equipment is low in cost and common. A smooth ion transport channel provided by the vertical carbon tube array and a rapid electron conduction network provided by the highly graphitized interconnected carbon tube structure are expected to be used in the fields of alternating current filtering, high power output and the like.

The invention provides a magnesium alloy surface alloy coating performance regulation and control method based on multi-scale numerical simulation. The magnesium alloy surface alloy coating performance regulation and control method comprises the steps that S1, microscopic coordination structure and solvation structure characteristics of all metal ions in multi-metal ion liquid electrolyte are simulated and analyzed; s2, fitting a reduction reaction mechanism and kinetic parameters of solvated ions on an electrode interface under an atomic scale; s3, verifying and optimizing an electrochemical reduction path of an electrode interface; s4, obtaining an influence rule of electrode interface microenvironment evolution on the performance of the plating layer; s5, constructing a process parameter-performance mapping relation database, and reversely and dynamically optimizing the electro-deposition parameters; and S6, based on the optimized electro-deposition parameters, magnesium alloy is used as a cathode for electroplating, and a surface alloy coating which is high in bonding strength, resistant to abrasion and resistant to corrosion is obtained. According to the method, by combining atom-molecule-macroscopic multi-scale numerical simulation and machine learning, screening and performance optimization of the magnesium alloy surface coating can be rapidly and accurately achieved, and the screening period is shortened.

The invention relates to the field of recycling of lithium ion batteries, and discloses a method for recycling valuable metals in a failed lithium battery. The method comprises the following steps: (1) carrying out reaction on the nickel-cobalt-manganese slag and concentrated sulfuric acid, carrying out water leaching on the obtained slurry, and carrying out solid-liquid separation to obtain a cobalt-manganese leaching solution and nickel slag; (2) extracting the cobalt-manganese leachate, carrying out reverse extraction on the obtained organic phase to obtain a manganese sulfate solution, and then carrying out evaporative crystallization to obtain manganese sulfate; the extracted raffinate is subjected to evaporative crystallization, and cobaltous sulfate is obtained; and (3) the nickel slag obtained in the step (1), an acid solution and hydrogen peroxide are subjected to a catalytic oxidation reaction, an obtained nickel sulfate solution is subjected to electro-deposition treatment, and nickel is obtained. According to the method, the recovery rate and purity of the valuable metal are improved, the recovery process of the valuable metal of the lithium battery is simplified, the whole process is environmentally friendly, near-zero discharge of wastewater is achieved, and the investment cost is low.

The invention discloses a method for recovering rare earth and valuable metal from waste rare earth alloy by using ionic liquid, and belongs to the technical field of non-ferrous metal metallurgy. Comprising the following steps that (1) recycled waste rare earth alloy is smashed, and waste rare earth alloy powder is obtained; (2) the waste rare earth alloy powder is put into ionic liquid to be subjected to a leaching reaction, solid-liquid separation is conducted after leaching is completed, and solid rare earth salt and filtrate are obtained; and (3) the filtrate serves as electrolyte, an electrolytic deposition system is constructed for electrodeposition, and valuable metal is obtained. The recovery method also has the advantages of simple process, environmental friendliness, high purity of the regenerated electrolyte and stable performance, and has great popularization and application prospects.

The invention discloses a nickel-tin alloy-oxide composite material Ni3Sn2-NiSnOx, a preparation method thereof and application of the nickel-tin alloy-oxide composite material Ni3Sn2-NiSnOx in electrocatalytic ammonia synthesis reaction, and belongs to the technical field of electrochemical catalysis. The preparation method comprises the following steps: adding SnCl2. 2H2O and NiCl into deionized water as raw materials, adding glycine, potassium pyrophosphate and urea as electro-deposition auxiliary agents, and stirring for 10 minutes to obtain electro-deposition liquid; and carrying out electro-deposition on a conductive substrate serving as a cathode, so that Ni and Sn are co-deposited to form a nickel-tin alloy, and part of the nickel-tin alloy reacts with oxygen in the deposition process or after deposition to form a nickel-tin oxide phase, so that the Ni3Sn2-NiSnOx composite catalytic material is obtained. By regulating and controlling the concentration of tin ions in the electroplating solution and the electrodeposition time, the component proportion of nickel and tin in the product and the morphology structure of the material can be regulated. The composite material provided by the invention has excellent electrocatalytic nitrogen reduction synthesis ammonia activity and selectivity, and solves the problems that the service life of a catalyst is shortened and the catalytic activity and stability are reduced due to irreversible reconstruction of an alloy compound under high potential.

The invention discloses a granular catalyst and a preparation method thereof, and belongs to the technical field of chemical engineering. The preparation method of the granular catalyst comprises the following steps: S1, mixing raw materials containing a carbon material, an active metal material and a solvent to form slurry; s2, the slurry serves as a cathode in an electrode system and is subjected to pulse electrodeposition treatment, and active metal is deposited on the surface of a carbon material to form a particle catalyst; the electrode system is a two-electrode system; an anode in the two-electrode system comprises a dimensionally stable electrode, and an anode electrolyte is a sulfuric acid solution; and the two electrode systems are electrode systems in a flow battery stack structure. According to the preparation method, a flowing slurry and pulse electrodeposition combined method is adopted, so that metal particles are uniformly and stably loaded on a carbon material carrier, and gt is obtained within one-time preparation time of 1h; according to the method, laboratory-scale continuous synthesis of the granular catalyst is realized, and the method is simple in preparation process, mild in reaction condition and high in controllability.

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

The application discloses a high-performance stainless steel-based electrolytic water dual-function electrode and application thereof, and the electrode is prepared through the following steps: step 1, pretreating a stainless steel surface to remove impurities on the surface; step 2, placing the stainless steel obtained after the treatment in step 1 and a phosphorus source in an argon atmosphere under the condition of 350-450 DEG C, phosphorizing the stainless steel for 1-3 hours to obtain a phosphorized stainless steel electrode, wherein the linear distance between the phosphorus source and the stainless steel is kept at 5-10 cm; and step 3, placing the phosphorized stainless steel electrode obtained after the treatment in step 2 in a RuCl3 solution, and performing electrodeposition on the phosphorized stainless steel as a cathode to obtain the electrode, wherein the concentration of the RuCl3 solution is 2-8 mmol / L, the potential window during the electrodeposition is-2 V-0 V, and the electrodeposition time is 15-25 cycles.

A method of obtaining a purified rare earth metal deposit from a rare earth metal halide salt, by: (i) producing a rare earth metal borohydride salt by the following reaction:n·ABH4+m·(RE)X3→RE(BH4)3+n·AXwherein the variables are defined as follows: A is an alkali metal cation; RE represents one or more rare earth metal cations; X represents a halide selected from chloride, bromide, and iodide; n is the molar amount of ABH4; and m is the molar amount of (RE)X3; wherein the ratio of n:m is 3:1 to 5:1; (ii) mixing RE(BH4)3 and AX with a halogen-free organic solvent to form a solution containing the RE(BH4)3 salt dissolved therein and with AX undissolved and precipitated; and (iii) contacting the solution from step (ii) with an anode and cathode in electrical communication, and electrically charging the anode and cathode to electroplate the rare earth metal onto the cathode.

A method for the electrodeposition of a functional or decorative chromium layer onto a metallic substrate in an electrodeposition process from a halide-ion free and boric acid free aqueous electrolyte solution and to the coated product obtained thereby.