768 results about "Galvanic deposition" patented technology

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 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 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 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 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 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.

The invention relates to a layered composite electrode and a preparation method and application thereof. The electrode takes foamed nickel as a substrate layer, a layer of manganese phosphide is grown on the surface of the foamed nickel by adopting a hydrothermal method, then Co oxide is deposited on the surface of the manganese phosphide layer by adopting a cyclic voltammetry (CV) electrodeposition technology, and the CozO / MnyPx / NF electrode is obtained after cleaning and drying, and the catalyst on the surface of the CozO / MnyPx / NF electrode is of a nanosheet structure. Lattice distortion of the MnxP nano material is induced through a Co and O double-doping strategy, the electronic structure of the MnxP nano material is optimized, and the oxygen vacancy content is increased, so that the oxygen evolution performance of the catalyst is improved.

The invention belongs to the technical field of copper foils, and particularly relates to a preparation method of a copper foil, the copper foil and a raw foil system.The preparation method comprises the steps of raw foil electrolysis, roughening treatment and curing treatment.The raw foil electrolysis is that multi-step electro-deposition is conducted in an electrolyte to form the copper foil, the multi-step electrodeposition comprises at least two deposition stages adopting different current densities and different copper ion concentrations, and in the deposition stage process, a composite additive comprising at least two different molecular weight components is added into an electrolyte; the roughening treatment comprises at least two roughening stages, and the concentration of copper ions in the electrolyte in the later roughening stage is lower than the concentration of copper ions in the electrolyte in the previous roughening stage; the curing treatment comprises at least two curing stages, and the concentration of copper ions in the electrolyte in the later curing stage is lower than that of copper ions in the electrolyte in the previous curing stage. According to the method, the elongation of the super-thick electrolytic copper foil at high temperature can be improved, meanwhile, the low surface roughness of the super-thick electrolytic copper foil is maintained, and the high peel strength of the super-thick electrolytic copper foil is guaranteed.

Dynamic windows with adjustable tint give users greater control over flow of light and heat. Reversible metal electrodeposition dynamic windows include (i) a transparent or translucent conductive electrode; (ii) an electrolyte solution in contact with the electrode, the electrolyte solution comprising metal cations that are reversibly electrodeposited onto the transparent electrode upon application of a cathodic potential; and (iii) a counter electrode. The electrolyte solution advantageously includes a small amount of an additive (e.g., an inhibitor, an accelerator, a leveler, or an organic or inorganic molecule that similarly serves to enhance the surface morphology of the metal cations during reversible metal electrodeposition onto the transparent electrode). Such enhancement of surface morphology during the reversible electrodeposition of the metal tinting layer over the electrode enhances one or more of color neutrality, transmittance characteristics of visible wavelengths (e.g., ability to achieve a near 0% transmission privacy state), infrared reflectance, or switching speed.

The present application relates to the technical field of electrochemical sensor, and especially to a sludge-based biochar suspension for electrode modification, a preparation method and application thereof, wherein the sludge-based biochar is prepared by taking brewery residual sludge as raw material, and then the ash is removed by HF solution and oxidized by nitric acid solution, so that the sludge-based biochar generates more pores, the specific surface area is improved, and meanwhile, the surface has more functional groups, such as nitro group and carboxyl group, which is beneficial to electrodeposition of CoS with high conductivity and high redox activity on the surface.

The invention provides a preparation method of a bidirectional pulse electrodeposition composite nickel-based electrode. The preparation method mainly comprises the following steps: (1) pretreating a nickel-based substrate; (2) in a nickel-based salt electroplating aqueous solution, carrying out electro-deposition on the treated nickel-based base material by adopting bidirectional pulse current to obtain a composite nickel-based electrode material; and (3) drying the obtained composite nickel-based electrode in a nitrogen oven to obtain the composite nickel-based electrode. Compared with the existing electro-deposition technology, the bidirectional pulse type electro-deposition method can effectively form a compact, wear-resistant and scouring-resistant load catalyst layer, can significantly improve the loading and dispersion of electrode active components, and at the same time, nickel-based metal and auxiliary active metal are mutually doped to form multi-element metal load, so that the performance of the electrode is improved. The electro-catalysis effect is greatly promoted through the electron action between different atoms, and the water electrolysis performance is effectively improved. Compared with constant-current electrodeposition, the method is simple in process condition, stable in performance, high in water electrolysis efficiency and easy to industrially expand, and has important industrial application prospects.

This invention provides a method for preparing (002) crystal-plane oriented metallic zinc and its application. The invention employs a two-electrode electrochemical deposition technique, using iron foil, titanium foil, or copper foil as the working electrode, commercial zinc foil as the counter electrode, and an aqueous zinc salt solution as the electrolyte. Constant current density discharge deposition is used to deposit (002) crystal-plane oriented metallic zinc on the working electrode; the constant current density is 50 mA cm⁻¹. ‑2 ~200 mA cm ‑2 The (002) crystal-plane oriented metallic zinc prepared by this invention can be used in rechargeable zinc-ion batteries. The two-electrode electrolytic cell device used in the preparation of metallic zinc in this invention is simple, the preparation process is straightforward, and the preparation method is more universal. The (002) crystal-plane oriented metallic zinc prepared according to the method of this invention can suppress zinc dendrite growth and hydrogen evolution, thereby improving the service life of rechargeable zinc-ion batteries.

The invention discloses a rare earth metal electrolytic reduction method based on a high-frequency switching power supply, and relates to the technical field of rare earth metal electrolytic reduction, and the method comprises the following steps: firstly, in a praseodymium-neodymium electro-deposition process, parameter data in the praseodymium-neodymium electro-deposition process is accurately obtained in real time by using an advanced sensor and detection equipment; and accurate, comprehensive and real-time data support is provided for subsequent intelligent analysis. According to the invention, the problems of stress accumulation, crack propagation and coating stripping caused by fixed preset intermittent closing time in high-current density electrodeposition are solved. Intelligent optimization is realized through real-time data acquisition, deep learning evaluation and dynamic pulse current regulation and control. And when the stress rise is detected, the system adaptively prolongs the intermittent closing time, and reduces the pulse peak current, so that the deposition rate is optimized, and the uniformity and compactness of a plating layer are improved. The method improves the mechanical strength and corrosion resistance of the coating, prolongs the service life of equipment, reduces the energy consumption, and improves the process stability and consistency.

The invention provides a method for inhibiting the formation of Kirkendall holes in an In-based brazing filler metal welding interface by adopting a vertical twin structure, which comprises the following steps of: respectively adhering a layer of vertical twin structure to the surfaces of an upper metal substrate to be welded and a lower metal substrate to be welded which are subjected to surface treatment in an electro-deposition manner, wherein the size of the vertical twin structure is 5 * 5 mm, the thickness of the vertical twin structure is 20-40 mu m, and the thickness of the vertical twin structure is 10 * 10 mm; the method comprises the following steps: carrying out a thermocompression bonding experiment on a pure copper coating with a vertical orientation nano twin crystal structure at set bonding temperature, pressure and time; according to the technical scheme, by means of the structural characteristic that the diffusion coefficient of the vertically-arranged twin boundaries in the nano twin structure is low, the diffusion rate of interface elements is reduced, flux balance is maintained, and the low impurity characteristic of the vertically-oriented nano twin film is utilized, so that formation of Kirkendall voids in the welding interface is limited. The method provided by the invention is simple and convenient to operate, and has great significance for improving the connection reliability of the In-based low-temperature bonding system.

The present invention discloses a method for preparing a pore-adjustable and metal-loaded graphite felt flow battery electrode, comprising the following steps: (1) pretreatment and pore separation: mixing graphite felt with an alkaline solution, magnetically stirring, heating, cooling to room temperature, and re-treating to obtain a pore-separated material; (2) loading neodymium oxide: immersing the pore-separated material in a solution containing a neodymium salt and a polyamino acid, heating, cleaning, and drying to obtain a neodymium oxide-modified electrode material; (3) loading oxygen-deficient CoMnOx: applying a mixed slurry containing manganese and cobalt to an electrode sheet, heating, cleaning, and drying to obtain an oxygen-deficient CoMnOx-loaded electrode; and (4) electrodepositing the oxygen-deficient CoMnOx-loaded electrode to obtain a novel graphite felt electrode with bismuth deposition. The electrode product obtained by the method of the present invention has an energy efficiency of more than 85%, and the number of stable cycles at which the energy efficiency is maintained can exceed 1440 times.

The invention belongs to the field of light modulators, and provides an electrochromic device based on reversible double electrodeposition and application of the electrochromic device. The electrochromic device sequentially comprises a first transparent substrate, a first conductive layer, an electrolyte layer, a second conductive layer and a second transparent substrate; the electrolyte layer comprises a solvent and an electrolyte additive, and the electrolyte additive comprises a manganese salt, a zinc salt and a redox medium. And the charge change in the manganese ion deposition / dissolution process is compensated through the reversible deposition / dissolution reaction of zinc ions in the electrolyte. In the coloring process, manganese ions are subjected to oxidation reaction on the surface of the first transparent conductive substrate to form manganese dioxide sediment; meanwhile, the zinc ions are subjected to reduction reaction on the surface of the second transparent conductive substrate to form metal zinc. And in the fading process, the sediment is dissolved, so that the device is recovered to the initial transparent state. In addition, dissolution of manganese dioxide and metal zinc can be accelerated by adding the oxidation-reduction medium, and the reaction kinetics of the device is improved.

The invention relates to a porous nickel-iron alloy integrated electrode and a preparation method and application thereof, and belongs to the technical field of electrochemistry. The preparation method comprises the following steps: carrying out cleaning pretreatment on a stainless steel mesh substrate; then electro-deposition is carried out in a solution containing ferric salt and nickel salt, and a nickel-iron alloy layer is formed; carrying out secondary electro-deposition in a solution containing zinc salt, and carrying out high-temperature calcination treatment to obtain a nickel-iron-zinc alloy; and finally, the zinc component is removed through selective corrosion of an alkaline solution, and the nickel-iron alloy integrated electrode with the porous structure is formed on the stainless steel mesh. The method is controllable in process, and a porous structure which is high in specific surface area and beneficial to mass transfer is effectively constructed through step-by-step electro-deposition, calcination and corrosion treatment. The obtained integrated electrode can be directly used as an alkaline water electrolysis oxygen evolution reaction (OER) anode, shows high electrocatalytic activity and stability, and is suitable for the fields of water electrolysis hydrogen production and the like.

The invention discloses a nickel-molybdenum hydrogen evolution electrode and a preparation method and application thereof, and belongs to the technical field of water electrolysis hydrogen production. The preparation method of the nickel-molybdenum hydrogen evolution electrode provided by the invention comprises the following steps: carrying out alkali oil removal and acid activation treatment on a nickel net to obtain a pretreated nickel net; and the pretreated nickel net serves as a cathode, electrodeposition is conducted in electroplating liquid containing nickel sulfate hexahydrate, sodium molybdate dehydrate, sodium citrate dehydrate, boric acid, sodium chloride and an additive, separation and collection are conducted, and the nickel-molybdenum hydrogen evolution electrode is obtained. The overpotential of the prepared hydrogen evolution electrode material can be as low as 44 mV under the current density of 10 mA cm <-2 >, and the overpotential of the hydrogen evolution electrode material can be as low as 118.5 mV under the current density of 100 mA cm <-2 >. And under the current density of 100 mA cm <-2 > and in a 1 mol / L KOH solution at normal temperature, the material can stably run for more than 250 hours, has excellent stability, and has a wide application prospect in the field of hydrogen production by electrolysis of water.

The present invention discloses a self-supporting oxygen evolution electrode and its preparation method and application, which belongs to the field of alkaline water electrolysis hydrogen production; the electrode is obtained by combining a hydrothermal method and an electrodeposition method; the electrode grows manganese-doped basic cobalt carbonate nanowires vertically on the surface of nickel foam, and the nanowires are surrounded by multiple layered nickel-iron double metal hydroxide nanosheets to form a nanorod as a whole. The nanorods are uniform in size, 2 to 3 μm long, and 100 to 500 nm in diameter, growing vertically on the surface of nickel foam; the electrode has high catalytic activity and stability. After using nickel foam as a conductive substrate, it can still operate stably for a long time under a high electrolysis current and in a strong alkaline medium; the electrode is used to catalyze the oxygen evolution reaction of water electrolysis to produce hydrogen under alkaline conditions; the present invention can be applied to renewable fuel cells, photoelectrocatalysis, alkaline anion exchange membrane water electrolysis (AEMWE) and electrolysis hydrogen generator devices.

The invention discloses a foamed nickel-based composite material based on an electro-deposition / hydrothermal synthesis method, which is characterized in that firstly, foamed nickel NF is used as a substrate, cobalt hydroxide is loaded on the surface of the NF through electro-deposition, and Co (OH) 2 / NF with a lamellar stacked flower-shaped structure is obtained; the preparation method comprises the following steps: preparing NiCo-LDH (layered double hydroxide) Co (OH) 2 / NF, then converting the NiCo-LDH (layered double hydroxide) Co (OH) 2 / NF into ZIF-67 through an impregnation method to obtain ZIF-67 (at) Co (OH) 2 / NF with a regular dodecahedron structure, and finally, preparing NiCo-LDH (at) Co (OH) 2 / NF with a honeycomb stacked structure through a hydrothermal method. The preparation method comprises the following steps: 1, preparing foamed nickel electro-deposition cobalt hydroxide; 2, preparing the foamed nickel loaded ZIF67 and cobalt hydroxide; and 3, preparing the nickel foam loaded nickel-cobalt layered double-metal hydroxide and cobalt hydroxide. When the material is used as a supercapacitor material, the area specific capacitance is 17-18F cm <-2 > when the current density is 1mA cm <-2 >; and when the current density is 10mAcm <-2 >, 70-80% of the initial capacity is still kept after 5000 charge-discharge cycles are carried out.

The invention relates to the technical field of air monitoring, and discloses an LIBS (laser-induced breakdown spectroscopy) and dynamic aerosol enrichment-based heavy metal online monitoring system, which comprises a cyclone separator, an electrostatic deposition channel, a filter membrane belt, a flushing gas head and a connecting pipe, an air outlet of the cyclone separator is communicated with a fan; an air outlet of the fan is communicated with the electrostatic deposition channel, and a positive electrode plate and a negative electrode plate are arranged in the electrostatic deposition channel at intervals; the filter membrane covers the positive electrode plate, the filter membrane belt is connected end to end and is driven by a motor to rotate, and the filter membrane belt can move relative to the positive electrode plate; the flushing air head is located in an area defined by the filter membrane belt, and the flushing air head is arranged close to the filter membrane belt; the connecting pipe is located outside an area defined by the filter membrane belt, one end of the connecting pipe is close to an air outlet of the flushing air head, and the other end of the connecting pipe is connected with an air inlet of a detector. The problem of low detection accuracy in the prior art is solved.