33results about How to "Reduce overpotential" patented technology

The invention relates to the technical field of off-grid renewable energy hydrogen production, and discloses an off-grid alkaline hydrogen production system and a power adaptive distribution and safety control method thereof, the off-grid alkaline hydrogen production system comprises a renewable energy power supply unit, a parallel electrolytic cell module, a gas-liquid treatment system and a main controller; in the Faraday hydrogen production mode, the bubble volume is compressed by adjusting the operation pressure so as to modulate the impedance characteristic of the electrolytic cell, and the energy efficiency is improved in cooperation with current control; and in the non-Faraday polarization hot standby mode, the voltage of the rectifier cabinet is controlled to be clamped to a non-gassing polarization interval, and liquid level plugging is constructed in the U-shaped communicating pipeline according to the fluid statics principle. The system is further provided with a transient buffering strategy based on the pneumatic capacity, and pressure attenuation is delayed through the gas dead zone volume when power is suddenly reduced. The problems of hydrogen production efficiency optimization, low-power safe hot standby and mechanical protection under wide power fluctuation are effectively solved.

The application relates to the technical field of carbon dioxide electro-reduction catalysts, and discloses a preparation method of a supported copper nitride catalyst, which comprises the following steps: mixing copper cyanamide and conductive carbon material and performing ball milling; the rotating speed of the ball milling is 500 r / min-5000 r / min, and the ball milling time is 1h-24h; the mass ratio of the copper cyanamide and the conductive carbon material is 1-10:1-10. The catalyst obtained by the method has better stability, selectivity and activity in a carbon dioxide electro-catalytic reduction reaction, and the addition of the conductive carbon improves the conductivity of the catalyst, so that the overpotential of the catalyst in the carbon dioxide electro-reduction is significantly reduced.

The invention discloses a preparation method and application of a porous iridium nano-metal catalyst, and belongs to the field of material synthesis and electro-catalysis. Iridium acetylacetonate and copper acetylacetonate are used as precursors, an IrCu alloy nanosphere precursor is prepared through solvothermal reaction in an ethylene glycol and surfactant system, copper is removed through acid etching, and the porous iridium nano spherical catalyst (Ir-NS) is obtained. The catalyst has a three-dimensional porous spherical structure, active sites are concentrated on the surfaces of nanospheres and the edges of the walls of internal mesopores, catalytic active sites are enhanced due to the iridium nanosphere structure and uniform site exposure density, oxygen bubbles are quickly released, and the active sites are prevented from being covered by the bubbles. In an acid medium and proton exchange membrane water electrolysis anode oxygen evolution reaction, the catalyst shows low overpotential and long-term operation stability under low iridium loading capacity. The method is simple in process and low in cost, does not need an additional hard template, and has a good industrial application prospect.

This invention discloses a carbon-coated iron porous aerogel, its preparation method, and its application in lithium metal anodes, belonging to the field of lithium metal anode material preparation. The carbon-coated iron porous aerogel of this invention constructs a continuously conductive and highly stable carbon-based porous three-dimensional framework through the synergistic effect of two-dimensional graphene oxide, one-dimensional carbon nanotubes, and carbon-coated iron units. The NaCl hard template effectively amplifies the macropore size and increases the number of pores, providing interconnected channels for the rapid wetting and spontaneous climbing of molten lithium. The carbon-coated iron interface serves as a stable lithiophilic site, inducing uniform nucleation of lithium metal and restricting disordered growth, thereby achieving stable confinement of lithium metal in the composite electrode.

The present invention relates to an electrochemical carbon dioxide conversion system, which includes: a first electrode; a second electrode; and a separator membrane positioned between the first electrode and the second electrode, being porous and comprising a first layer and a second layer having different average pore sizes.

The invention discloses a C, N-FeNbO4 / NF microrod based on foamed nickel in-situ 001 crystal face derivation and a derivation method and application thereof, and the method comprises the following steps: in a hydrothermal reaction, hydrolyzing urea to release OH-to replace oxalate in niobium oxalate so as to form a Nb-OH monomer; meanwhile, Fe < 3 + > is hydrolyzed into Fe (OH) 3 colloid; the preparation method comprises the following steps: performing liquid phase nucleation on Nb-OH and Fe (OH) 3 under a hydrothermal condition to form a FeNbO4 precursor, and growing the FeNbO4 precursor on foamed nickel (NF) in situ; in this way, the 001 crystal face of FeNbO4 is accurately regulated and controlled through the strong coordination effect of F <-> to form a rod structure. Under high-temperature (900 DEG C) carbonization, the FeNbO4 is further crystallized into an acid-resistant and alkali-resistant monoclinic crystal type three-dimensional microrod (C, N-FeNbO4 / NF) with C and N co-doped (C, N-FeNbO4) composite NF. According to the method disclosed by the invention, the agglomeration phenomenon of FeNbO4 is relieved; the microrod structure exposes more catalytic active sites, so that the catalytic activity is improved. In addition, the catalyst shows high conductivity by co-doping C and N with synergistic high-conductivity NF. Based on the regulation and control, the C, N-FeNbO4 / NF shows good electrochemical performance in the oxygen evolution reaction.

The application provides a self-supporting Ni-Fe-Mn oxygen evolution electrocatalyst and a preparation method thereof, and belongs to the technical field of catalytic material preparation. The Ni, Fe and Mn metal raw materials are repeatedly smelted, and after smelting, suction casting is carried out to obtain a cast plate. The cast plate is subjected to homogenization treatment, and then is cut and polished. Finally, etching is carried out in a nitric acid solution to obtain the self-supporting Ni-Fe-Mn oxygen evolution electrocatalyst. The self-supporting electrocatalyst is prepared by the method of arc smelting, heat treatment and chemical etching, and has the advantages of simple preparation process, easy industrialization, adjustable size, excellent stability and excellent OER performance.

The application discloses a preparation method of a single-crystal metal lithium negative electrode. The single-crystal metal lithium negative electrode with a dense packing surface Li(110) is obtained by annealing a polycrystal metal lithium foil horizontally placed after being heated in vacuum or inert atmosphere, and is directly used for battery assembly. The application remarkably improves the electrode reaction process kinetics of the metal lithium negative electrode by reducing the self-diffusion barrier of the surface of the metal lithium negative electrode, widens the safety boundary of the metal lithium negative electrode, and enables the metal lithium negative electrode to have no dendrite growth in a practical current density range. The prepared single-crystal metal lithium negative electrode can be directly used for battery assembly, and remarkably improves the cycle stability and safety of a high-specific-energy metal lithium battery, and promotes the development of practical high-safety metal lithium batteries.

The invention belongs to the technical field of catalysts, and discloses an iron-tantalum bimetal organic framework catalyst and a preparation method and application thereof. The iron-tantalum bimetal organic framework catalyst takes foamed nickel as a substrate, and a needle-shaped iron-tantalum bimetal organic framework material is uniformly loaded on the foamed nickel substrate. The preparation method comprises the following steps: carrying out acid etching on foamed nickel, then washing with ethanol and water in sequence, and drying; the preparation method comprises the following steps: uniformly dispersing water-soluble ferric salt and tantalum chloride in water to obtain a solution A; 2-hydroxyterephthalic acid is dissolved in a mixed solvent composed of absolute ethyl alcohol and N, N-dimethylformamide, and a solution B is obtained; dropwise adding the solution B into the solution A to obtain a solution C; obliquely placing foamed nickel into a hydrothermal reaction kettle, adding the solution C, completely soaking the foamed nickel, and reacting at 80-125 DEG C for 8-12 hours; and taking out the foamed nickel, washing with water, and drying to obtain the target catalyst. The catalyst prepared by the invention can realize low overpotential and excellent stability when being used for water electrolysis oxygen evolution reaction.

The invention relates to the technical field of water electrolysis, and discloses a water electrolysis hydrogen evolution method which comprises the following steps: under a water electrolysis condition, taking a water electrolysis hydrogen evolution catalytic electrode as a working electrode to carry out water electrolysis reaction; the water electrolysis hydrogen evolution catalytic electrode comprises a conductive substrate and a catalytic material compounded on the surface of the conductive substrate, and the catalytic material comprises a carbon-coated platinum-based alloy nano material and conductive carbon black; the preparation method of the carbon-coated platinum-based alloy nano material comprises the following steps: (1) mixing tetraammineplatinum acetate, transition metal acetate, citric acid and a solvent under a stirring condition, carrying out a coordination reaction, and carrying out solid-liquid separation to obtain a product solution; (2) removing a solvent in the product solution, and drying to obtain a precursor material; (3) performing high-temperature pyrolysis on the precursor material in an inert atmosphere; and (4) contacting the high-temperature pyrolysis product with acid, and then optionally washing and drying. The method has relatively low reaction overpotential and relatively high reaction activity and stability.

This invention discloses a Zn-containing carbon material suitable for battery substrates and its preparation method. The method first involves mixing and reacting an IPA dispersion of ZnCl2 and an IPA dispersion of NaBH4 to obtain a Zn-NaBH4 composite precursor. Then, the Zn-containing carbon material is prepared at low temperature and efficiently by reacting Zn-NaBH4 with CO2. This invention offers a simple preparation method, and the resulting Zn-containing carbon material exhibits good electrical conductivity, a stable chemical structure, and excellent Zn ion transport channels, demonstrating superior performance when used as a substrate material for Zn batteries.

The application discloses an in-situ growth MOG carbon nanofiber catalyst and a preparation method and application thereof, and comprises the following steps: stirring and mixing a nanofiber polymer and a solvent to obtain a uniform spinning liquid; performing electrostatic spinning to obtain a nanofiber membrane; adding a metal salt, a nitrogen-containing compound and resorcinol into water, slowly adding formaldehyde into the mixed solution to obtain an in-situ growth solution of a metal organic gel MOG; placing the nanofiber membrane into the in-situ growth solution to adjust a pH value, and performing in-situ growth by heating to obtain a MOG nanofiber membrane material; and performing high-temperature pyrolysis of the MOG nanofiber membrane material and urea in an inert atmosphere to dope nitrogen, thereby obtaining the MOG-CNF catalyst. The catalyst can effectively reduce overpotential of ORR and OER reactions, improve catalytic stability, and present stable and excellent dual-function electrocatalytic performance. Through a nano structure and a synergistic catalytic effect, the catalyst has a wide application prospect in the field of fuel cell energy storage and conversion.

This invention relates to a bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method, belonging to the field of electrocatalysis technology. The preparation method consists of the following steps: (1) weighing nickel sulfate and cobalt sulfate and dissolving them in deionized water; (2) dissolving sodium citrate and sodium hypophosphite in deionized water respectively, and then adding them sequentially to the solution obtained in step (1); (3) adjusting the pH of the solution obtained in step (2); (4) cutting the filter paper; (5) preparing a sodium hydroxide solution; (6) placing the cut filter paper in a water bath in the solution prepared in step (5); (7) weighing palladium chloride and sodium borohydride and dissolving them in deionized water at room temperature; (8) activating and then reducing the filter paper in step (6); (9) placing the filter paper obtained in step (8) in a water bath in the solution obtained in step (3) and drying it. This invention reduces overpotential, decreases relative energy consumption, increases catalytic activity, and improves catalyst stability.

The invention belongs to the technical field of electrochemical energy storage batteries, and particularly relates to a chlorine-free simple magnesium salt electrolyte for a magnesium-sulfur battery as well as a preparation method and application of the chlorine-free simple magnesium salt electrolyte. The electrolyte comprises magnesium salt, ionic liquid, an organic ether solvent, an amine solvent and an organic phosphide additive. The solvation structure is regulated and controlled through the synergistic effect of multiple components, the compatibility of the electrolyte with the sulfur positive electrode and the magnesium negative electrode is improved, and the electrochemical performance of the magnesium-sulfur battery is improved. Specifically, the amine solvent is used as a strong polar solvent to improve the solubility of the magnesium polysulfide, so that the diffusion and redox conversion kinetics of the magnesium polysulfide are promoted, and the organic phosphide is used as an additive to effectively improve the specific discharge capacity and voltage platform of the magnesium-sulfur battery. Meanwhile, due to the addition of the ionic liquid, the stability of a magnesium negative electrode / electrolyte interface is improved, the transmission capacity of Mg < 2 + > is enhanced, and the overpotential of magnesium deposition / dissolution is reduced. In addition, the electrolyte does not contain chloride ions, so that the corrosion problem caused by the chloride ions is avoided.

The application belongs to the technical field of electrocatalytic material preparation, and discloses a method for preparing a cobalt tungstate electrode based on gas-phase replacement, an electrode and application. 3 A seed layer is formed on the surface of the conductive substrate; then the conductive substrate is placed in a hydrothermal reaction solution containing tungstate, and a hydrothermal reaction is performed; after cleaning and drying, annealing treatment is performed, so that a WO3 nanosheet array is obtained on the conductive substrate; then the conductive substrate and a volatile cobalt source are placed in a protective atmosphere and under negative pressure to perform a gas-phase cation replacement reaction, so that a cobalt tungstate multistage nanostructure electrode is obtained. The application utilizes the characteristics of gas-phase reaction, and on the basis of inheriting the two-dimensional array structure of the precursor, a hierarchical rough morphology is constructed in situ; the prepared cobalt tungstate multistage nanostructure electrode exhibits excellent catalytic activity in the electrocatalytic oxygen evolution reaction in an alkaline medium, the process is simple and the parameters are controllable, and the application has good application prospect.

This invention discloses a method for preparing a three-phase composite material of perovskite, carbon, and alloy particles, and its application in water electrolysis. The method allows for the in-situ growth of 10-20 nm alloy particles on the surface of perovskite, and the coating of the perovskite and alloy particles with a carbon-nitrogen shell. The perovskite has a size of 100-200 nm, and the carbon-nitrogen shell has a thickness of approximately 10 nm, which is adjustable. In this invention, perovskite material is distributed in a dopamine salt solution. Under alkaline conditions, the dopamine salt polymerizes on the perovskite surface to form a polydopamine coating. After drying, it is calcined under an inert atmosphere to form a carbon-nitrogen shell structure. The metal sites in the perovskite and the alloy particles act as active sites, catalyzing the oxygen evolution reaction. The sufficiently small size of the surface-deposited alloy particles provides more active sites, promoting improved catalytic activity. The carbon-nitrogen shell increases the conductivity of the material, further enhancing its electrocatalytic activity.

The invention provides an Ir / IrO2 catalyst, a preparation method and application thereof, and a membrane electrode. The preparation method of the Ir / IrO2 catalyst comprises the following steps: calcining a mixture containing an iridium source and inorganic acid salt in a solid phase to obtain the Ir / IrO2 catalyst. The Ir / IrO2 catalyst disclosed by the invention is applied to an acidic electrolyzed water oxygen evolution reaction, the overpotential is relatively low, and the stability is relatively high; the membrane electrode prepared by adopting the Ir / IrO2 catalyst disclosed by the invention has higher activity and stability when being applied to a proton exchange membrane water electrolysis catalytic reaction.

The invention provides a confinement conductive composite membrane, a preparation method thereof and an electrochemical method for in-situ hydrolysis of extracellular polymeric substances based on the confinement conductive composite membrane, and relates to the technical field of sewage treatment. The confinement conductive composite membrane comprises an ultrafiltration membrane carrier and a conductive layer formed on the surface of the ultrafiltration membrane carrier, the conductive layer is made of a carbon nano tube material, and at least one of nano Ni, Co, Fe and Mo catalysts is selectively loaded on the inner wall of a hollow tube or between two-dimensional layers of the carbon nano tube material. The structure effectively prevents agglomeration and loss of the catalyst through a confinement effect, and the dispersity and stability of the catalyst are improved; meanwhile, a continuous conductive network formed by the carbon nanotubes has excellent electron transmission capability, and electrons can be quickly transmitted to catalytic active sites. When the composite membrane is used as a cathode to work, the loaded nano-metal catalyst can remarkably reduce the overpotential of hydrogen evolution reaction, an interface can be induced to construct an alkaline microenvironment in situ under low voltage, and EPS attached to the surface of the membrane is promoted to be hydrolyzed and degraded.

The invention discloses a negative current collector with a carbon-containing functional layer and a preparation method of the negative current collector, and relates to the technical field of current collectors. The negative current collector comprises a base material and a carbon-containing functional layer coated on the surface of the base material; the carbon-containing functional layer comprises the following raw materials in parts by weight: 40-50 parts of a carbon skeleton, 25-35 parts of a sodium-philic material, 18-24 parts of a binder and 0.5-2 parts of a surfactant; the binder is composed of a porous imidazolium-based binder and sulfonated-polyether ether ketone-Na in a mass ratio of (2-3): 1. According to the prepared negative electrode current collector, the energy density when the negative electrode current collector is used for a sodium ion battery is effectively improved, and risks caused by sodium dendrites generated by a negative electrode in the charging process are reduced.

The present application relates to the technical field of hydrogen evolution by water electrolysis, and particularly relates to a bimetallic@vacancy type ZIF-8 composite material, a preparation method and application. The bimetallic@vacancy type ZIF-8 composite material comprises vacancy type ZIF-8 and Ru and Pt atomic level active sites anchored on the surface of the vacancy type ZIF-8, the Ru and Pt are dispersed on the surface of the vacancy type ZIF-8 in the form of single atoms or double-atom near neighbors, and no metal crystal phase is formed. The present application utilizes the precise anchoring and spatial confinement effect of the metal coordination unsaturated vacancy on the vacancy type ZIF-8 on the Ru atoms and Pt atoms, so that the Ru sites and Pt sites are distributed in near-neighbor distribution on the atomic scale and form an interface electronic coupling effect, thereby simultaneously breaking through the kinetic bottleneck that a single metal site is difficult to consider water dissociation and hydrogen desorption, and solving the technical problems of low utilization rate of noble metal atoms, insufficient activity of single metal catalyst and slow alkaline HER kinetics in the prior art.

This invention discloses a carbon-plastic bipolar plate for a zinc-bromine flow battery, its preparation method, and its application, belonging to the field of electrochemical energy storage technology. The method includes: dispersing nitrogen-doped hollow carbon nanotubes and spraying them onto the positive electrode side of a carbon-plastic bipolar plate; after drying, a nitrogen-doped hollow carbon nanotube-modified positive electrode carbon-plastic bipolar plate is obtained; dispersing boron-nitrogen co-doped carbon and spraying it onto the negative electrode side of a pretreated carbon-plastic bipolar plate, after drying again, a boron-nitrogen co-doped carbon-plastic negative electrode carbon-plastic bipolar plate is obtained. On the positive electrode side, the nitrogen-doped hollow carbon nanotubes catalyze the bromine reaction through nitrogen doping, reducing the overpotential; the hollow structure adsorbs bromine species and uses charge action to inhibit bromine permeation, reducing self-discharge. On the negative electrode side, the boron-nitrogen co-doped carbon uses B-N zinc-loving sites to guide uniform and dense zinc deposition, inhibiting dendrite formation; and inhibits hydrogen evolution through charge regulation. Both methods synergistically improve the bromine barrier performance, reaction kinetics, and dendrite suppression ability of the carbon-plastic bipolar plate.

The invention discloses a novel PEM electrolytic cell with an enhanced diffusion type flow channel structure, which comprises an electrolytic chamber structure, the electrolytic chamber structure is sequentially composed of a cathode plate, a cathode diffusion layer, a membrane electrode, an anode diffusion layer and an anode plate and is fixed through fasteners, and the surfaces of the adjacent sides of the anode plate and the cathode plate are provided with protruding structures to form a flow channel group. According to the novel PEM electrolytic bath, the protruding structures are arranged on the inner sides of the anode plate and the cathode plate to form the flow channel set, so that an electrolyte forms a directional flow path in the flow channel, the electrolyte is effectively guided to be distributed to the whole catalytic area, and local drying or concentration polarization is avoided. The flow channel structure provides a clear escape channel for generated hydrogen (cathode) and oxygen (anode), the residence time of bubbles on the surface of the catalyst is shortened, and ohmic impedance and overpotential are reduced. And the functional layers are connected by adopting fasteners, so that the assembly, disassembly and maintenance are convenient, and the device is suitable for a large-scale stacked PEM electrolytic cell system.

The application relates to a ruthenium-doped tantalum pentoxide nanorod array material and a preparation method and application thereof. The method comprises the following steps: mixing hydrochloric acid, hydrofluoric acid and a polyhydric alcohol, adding tantalum pentachloride powder, stirring, adding a ruthenium salt, stirring, and obtaining a mixed solution; adding the mixed solution into a reaction kettle, placing a gas diffusion electrode base in the mixed solution in the reaction kettle, carrying out liquid phase reduction, sequentially cleaning and drying the gas diffusion electrode base after the liquid phase reduction, and obtaining a composite electrode; and carrying out annealing treatment in a nitrogen atmosphere, so as to obtain the ruthenium-doped tantalum pentoxide nanorod array material. Compared with the prior art, the ruthenium-doped tantalum pentoxide nanorod array material has regular and uniform morphology, good crystallinity, a simple method, a short technological process, and easy-to-control reaction conditions, and can be prepared in a large area.

This invention discloses a chloride-intercalated nickel-iron layered double hydroxide, its preparation method, and its application, belonging to the field of electrocatalytic materials technology. In this invention, chloride ions occupy the interlayer domains without disrupting the main layer structure, and the interlayer spacing is stably expanded through electrostatic interaction. The one-step hydrothermal method for preparing this material includes: immersing nickel foam in a mixed solution containing chloride salt, nickel salt, iron salt, and urea for a hydrothermal reaction, thereby obtaining an in-situ grown nanoflower-like array structure catalytic electrode. This catalytic electrode exhibits performance at 10 mA / cm² in alkaline water oxidation. ‑2 The overpotential is only 179 mV, allowing for stable operation for over 500 hours in anion exchange membrane water electrolysis devices. It also exhibits excellent electro-oxidation activity for biomass molecules such as glycerol, methanol, ethanol, and urea. This invention features a simple and low-cost preparation process, making it suitable for alkaline water electrolysis and biomass-assisted electrolysis hydrogen production.

The application belongs to the technical field of electrochemical catalysis and energy chemical industry, and discloses a copper-based composite catalyst, a preparation method, a dynamic potential stabilization method and application. A strategy of catalyst preparation and electrochemical operation is provided, which specifically comprises a Cu / Cu2O composite catalyst easy to prepare on a large scale, and a pulse potential operation method for dynamically maintaining the activity of the catalyst, so that efficient and stable co-production of furfural electro-oxidation and hydrogen production is realized.

The invention relates to the technical field of lithium oxygen batteries, in particular to a heterojunction type NiO-coated Fe2O3 / CC positive electrode material as well as a preparation method and application thereof. According to the preparation method, a two-step hydrothermal method is adopted to sequentially construct the vertically arranged Fe2O3 nanorod array and the NiO nanowire attached to the Fe2O3 nanorod array on the carbon cloth to form a unique three-dimensional hierarchical heterostructure, so that the specific surface area of the material is greatly increased, more active sites are exposed, and excellent conductivity and structural stability of the electrode are ensured; the NiO-coated Fe2O3p-n heterojunction and the three-dimensional hierarchical structure are adopted, so that the performance of the photo-assisted lithium oxygen battery is remarkably improved, and the overpotential of the battery under the illumination condition is remarkably reduced; the preparation method is simple and does not depend on precious metal, rare earth or selenide, through direct combination of the carbon cloth substrate and the active material, an excellent electron conduction path and structural stability are ensured, and the cycle life of the electrode is remarkably prolonged.

This invention discloses a method for preparing graphene-loaded iridium-ruthenium-cobalt-copper-nickel high-entropy nanoparticles. The method includes: dissolving iridium, ruthenium, cobalt, copper, and nickel metal salts in an equiatomic ratio to prepare a metal precursor solution; simultaneously preparing a graphene oxide dispersion; and then mixing and atomizing the dispersion using a dual-feed atomization drying device to obtain a composite precursor powder. Finally, the powder is subjected to microwave reduction under inert gas protection to obtain graphene-loaded iridium-ruthenium-cobalt-copper-nickel high-entropy nanoparticles. This invention employs a synergistic process of dual-feed atomization and microwave reduction, avoiding metal ion aggregation and elemental segregation, achieving uniform and stable loading of high-entropy nanoparticles on the graphene surface. The high-entropy nanoparticles have a single-phase face-centered cubic structure with a particle size of 8 nm to 25 nm. The process is simple, efficient, low-consumption, and allows for controllable proportions. The prepared graphene-loaded iridium-ruthenium-cobalt-copper-nickel high-entropy nanoparticles can be widely used in water electrolysis, exhibiting advantages such as low overpotential and high stability, making them suitable for large-scale production and industrial applications.

The application provides a kind of sulfur-doped keggin type molybdenum polyacid and nickel sulfide heterojunction composite catalyst and its preparation method and application.The heterojunction composite catalyst is composed of keggin type molybdenum polyacid doped with sulfur and nickel sulfide;The heterostructure of the heterojunction composite catalyst is formed by MoS2 and NiS.The application uses keggin type molybdenum polyacid ([HPMo9O 34 ] 8‑ )As a polyoxometalate framework, modify the nickel source, and simultaneously sulfidize, realize the synthesis of sulfur-doped keggin type molybdenum polyacid and nickel sulfide heterojunction composite catalyst, the heterojunction composite catalyst has excellent electrocatalytic performance and excellent electrochemical stability, in oxygen evolution reaction, it shows lower overpotential, lower tafel slope and excellent long-term running stability, provides a practical strategy for developing high-performance, low-cost, corrosion-resistant OER materials.

The present application relates to the technical field of magnesium foil material, in particular to a vacuum evaporation magnesium film, a preparation method and application thereof, the magnesium film comprises a substrate and a thin film layer, the material of the thin film layer is magnesium and is covered on the surface of the substrate by vacuum evaporation; the preparation method uses aluminum foil, copper foil, gold foil, silver foil, nickel foil, molybdenum foil, titanium foil, tin foil, stainless steel foil, polymer composite metal foil, metal alloy foil, carbon-coated metal foil, polyimide and high polymer material as the substrate, a layer of high-purity magnesium thin film is uniformly deposited on the surface of the substrate by controlling the vacuum evaporation process; when the magnesium film is applied to a magnesium battery, the substrate provides good electrical conductivity and mechanical support, and the magnesium layer directly participates in the electrochemical reaction as an active material, which not only improves the energy density and cycle life of the magnesium battery, but also simplifies the manufacturing process and reduces the cost; the magnesium negative electrode prepared by the method has excellent electrochemical performance and stability, and has good application prospect.

This invention relates to the field of wastewater treatment technology, specifically disclosing a photoanode material, a photoanode, its preparation method, and its application in wastewater treatment. The photoanode material comprises an FeSe2 array layer and a Bi2O2WO4 layer supported on the FeSe2 array layer. FeSe2 has a narrow band gap, good light absorption performance, and photogenerated charge separation capability, which can sensitize other semiconductors with wider band gaps to form heterojunctions, promoting the improvement of photocurrent density and electron quantum yield, and enhancing the photoelectric conversion efficiency of the catalytic material. Bi2O2WO4 is composed of [Bi2O2]. 2+ Layers and [WO4] 2‑ The vertically alternating layers facilitate the separation of photogenerated electrons and holes, thereby enhancing the catalytic oxidation activity of the electrode. The combination of Bi₂O₂WO₄ and FeSe₂ improves their respective solar photoresponse capabilities and photoelectrocatalytic performance, offering significant advantages in environmental engineering.