116 results about "Cobalt phosphide" patented technology

The invention discloses a high-hardness tungsten carbide-cobalt hard alloy and a preparation method thereof. A production raw material formula comprises the following components in parts by mass: 100 parts of tungsten carbide powder, 6-20 parts of cobalt powder, 0.2-1.3 parts of a composite sintering aid, 0.5-4 parts of a wet grinding medium and 0.2-4 parts of a forming agent, the composite sintering aid is composed of rare earth oxide and cobalt phosphide according to the mass ratio of (1-5): 1. The method has the advantages that on the premise that the toughness of the tungsten carbide-cobalt hard alloy is slightly improved, the hardness and wear resistance of the alloy are remarkably improved, and the industrial problems that the hardness improvement of the tungsten carbide-cobalt hard alloy with a single sintering aid is limited and the toughness of the alloy is lost are solved.

The invention discloses a sulfur positive electrode material based on an amorphous crystalline cobalt phosphide / porous carbon composite carrier and a preparation method and application of the sulfur positive electrode material, the amorphous crystalline cobalt phosphide / porous carbon composite carrier is used as a conductive carrier, and the amorphous crystalline cobalt phosphide / porous carbon composite carrier is fused and compounded with active sulfur to obtain the composite sulfur positive electrode material for a lithium-sulfur battery. According to the present invention, the hierarchical porous structure is provided, the high specific surface and the high pore volume provide the sufficient sulfur loading space, the three-dimensional carbon network structure provides the excellent electron conduction and ion diffusion ability, the chemical adsorption can be well achieved, the reversible conversion of the polysulfide can be efficiently catalyzed, and the utilization rate of the active substance can be improved; the catalytic activity can be optimized, the electro-catalytic performance of the catalyst can be improved, dissolution and diffusion of polysulfide can be physically limited, and meanwhile electrode volume expansion in the charging and discharging process is relieved; the sulfur positive electrode material is applied to a lithium-sulfur battery, can effectively inhibit dissolution and shuttling of polysulfide, and shows excellent electrochemical performance.

The invention provides a high-activity catalyst for producing hydrogen by electrolyzing water as well as a preparation method and application of the high-activity catalyst. Specifically, the catalyst for producing hydrogen by electrolyzing water comprises: a carbon sintered body carrier; the active components are loaded on the surface and inside the carbon sintered body carrier, the active components comprise nickel molybdenum nitride (NiMoN), cobalt phosphide (CoP) and cerium oxide, and the catalyst has a porous structure. The catalyst is low in cost, high in activity and good in stability, the cost of hydrogen production through water electrolysis can be effectively reduced, and the hydrogen production efficiency is improved.

The invention provides a hollow cobalt phosphide catalyst for oxidation of 5-hydroxymethylfurfural and preparation of the hollow cobalt phosphide catalyst. A preparation method comprises the following steps: (1) dispersing ZIF-67 in an ethanol-water solution for reflux heating etching; and (2) carrying out low-temperature phosphorization on the ZIF-67 (at) Co (OH) 2 to obtain the hollow cobalt phosphide catalyst. The MOF-derived hollow cobalt phosphide catalyst disclosed by the invention is used for electrocatalytic oxidation of 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid, has a hollow structure, fully exposes Co sites, induces conversion to Co < 3 + > and Co < 4 + > to a greater extent, remarkably improves catalytic activity and promotes reaction kinetics. The synthesis method disclosed by the invention is simple, convenient, green and environment-friendly, solves the problem that the whole catalytic efficiency is limited due to the fact that phase change only occurs at Co sites on the surface and the interior is not fully utilized due to a compact microstructure of a traditional cobalt-based nano material, and has a good application prospect.

The invention belongs to the technical field of energy and electrochemical catalysis, and discloses a titanium nitride / transition metal phosphide heterojunction electrode with a nano array structure, a preparation method of the titanium nitride / transition metal phosphide heterojunction electrode and application of the titanium nitride / transition metal phosphide heterojunction electrode to seawater electrolysis for hydrogen production. The electrode comprises titanium nitride grown on a conductive substrate and transition metal phosphides (such as cobalt phosphides, nickel phosphides, iron phosphides or a combination thereof) loaded on the surface of the titanium nitride. According to the composite electrode, a titanium dioxide nano array is synthesized on a conductive substrate through seed crystal assisted solvothermal, and a titanium nitride electrode is obtained through high-temperature nitridation; and then carrying out hydrothermal loading on a transition metal precursor and carrying out low-temperature phosphating treatment to obtain the titanium nitride / transition metal phosphide composite electrode. By combining high conductivity and corrosion resistance of titanium nitride and high catalytic activity and electrochemical stability of transition metal phosphide, the technical problems that a traditional electrode is easy to corrode and poor in catalytic stability in a seawater environment are solved; the synthesized titanium nitride / transition metal phosphide composite electrode is of a multi-scale graded nano array structure, and the micro-nano composite morphology of the composite electrode can be used for inducing the turbulence effect of an electrolyte, so that hydrogen evolution bubble separation is accelerated, and interface adsorption of precipitates such as magnesium hydroxide / calcium hydroxide is inhibited. Through the innovative hierarchical heterostructure design, an efficient, low-cost and long-life electrode solution is provided for direct hydrogen production from seawater, and the method has a wide industrial application prospect.

The invention discloses a cerium dioxide doped nickel phosphide cobalt loaded titanium carbide Mxene composite electrocatalytic material and a preparation method thereof, and belongs to the technical field of electrocatalytic materials. According to the invention, single / few-layer Ti < 3 > C < 2 > T < x > MXene is successfully synthesized by adopting LiF + HCl as an etching agent through a simple in-situ generation method, and a terminal functional group on the surface of the Ti < 3 > C < 2 > T < x > MXene can attract metal active components; niCoP nano-particles are prepared through a hydrothermal method and a thermal phosphating process and are loaded on a few layers of Ti < 3 > C < 2 > T < x > M < Xene > material, CeO2 NPs are attached to NiCoP and Ti < 3 > C < 2 > T < x > M < Xene > sheet layers, and the difunctional CeO2-NiCoP / Ti < 3 > C < 2 > T < x > M < Xene > composite electro-catalytic material is obtained. The preparation method is simple and efficient; the prepared composite electro-catalytic material can show excellent HER and OER catalytic activity and stability.

The invention belongs to the technical field of catalyst preparation, and provides an iron-nickel-phosphorus catalyst, a preparation method and application thereof, and a method for producing an aqueous hydrogen peroxide solution through electro-catalysis. The preparation method comprises the following steps: mixing nickel chloride, ferric chloride, elemental phosphorus and alcohol amine, and carrying out solvothermal reaction to obtain the iron-nickel-phosphorus catalyst. The iron-nickel-phosphorus catalyst containing iron phosphide, nickel phosphide and iron-doped nickel phosphide is obtained by taking a nickel salt, an iron salt, a phosphorus simple substance and a reducing solvent as raw materials and carrying out solvothermal reaction. The iron-nickel-phosphorus catalyst obtained by the invention can efficiently generate hydrogen peroxide through electro-catalysis in an electrolyte with the pH value of 5-9, so that the pH value range of the prepared hydrogen peroxide aqueous solution is wide, and the application range and field are wider; compared with selenium-doped cobalt phosphide in the prior art, the prepared hydrogen peroxide aqueous solution is wider in application.

The invention discloses a method for preparing alanine by photoreforming polylactic acid plastic, which is characterized by comprising the following steps: placing polylactic acid plastic and a photocatalyst in ammonia water to obtain a reaction solution, and adding the reaction solution into a light-transmitting reactor; and in an inert atmosphere, irradiating the reaction liquid with a light source at 60-80 DEG C for 5-20 hours, and carrying out a photocatalytic reaction to obtain the alanine. According to the method, the process of catalyzing the polylactic acid plastic to be converted into the alanine is achieved through the one-step method with the self-made cobalt phosphide / cadmium sulfide as the photocatalyst, high selectivity and stability are achieved, meanwhile, the method is simple in process, raw materials are easy to obtain, reaction conditions are mild, separation and purification operation is easy, and high economic value and application value are achieved.

A catalytic electrode includes a nickel-based porous base material, and a plurality of catalytic alloy balls of nickel and another metal doped with elements, in which the another metal includes iron, the elements include C, F, and S, and the catalytic alloy balls are dispersed on the surface of the nickel-based porous base material. The catalytic electrode also includes a plurality of metal phosphide particles covering the nickel-based porous base material and the catalytic alloy balls, and the metal phosphide particle includes nickel phosphide, nickel iron phosphide, nickel cobalt phosphide, nickel copper phosphide, or nickel zinc phosphide.

The present invention relates to the field of battery material technology and discloses a preparation method and application of a cobalt phosphide-modified porous carbon nanofiber composite lithium negative electrode and carrier. The preparation method comprises dissolving cobalt nitrate hexahydrate and polyacrylonitrile in an N,N-dimethylformamide solution, mixing and spinning to obtain a cobalt-containing precursor film, wherein the mass ratio of cobalt nitrate hexahydrate to polyacrylonitrile is 1:1.5-3.2; then soaking the film in a methanol solution for 6-24 hours, and then soaking the film in a methanol solution containing a phosphorus source for 1-2 hours, wherein the volume ratio of the phosphorus source to the methanol solution is 1:40-60; and then pre-oxidizing and pyrolyzing the film for 1-2 hours to obtain a porous nanofiber carrier for a composite lithium metal negative electrode. The nanofiber carrier has a porous structure, which facilitates rapid electrolyte transport and uniform lithium ion flux on the negative electrode surface. The negative electrode has good coulombic efficiency and a high cycle number.

The invention provides a bifunctional electrocatalyst, a preparation method thereof and a hydrogen production method, and relates to the field of catalysts. The bifunctional electrocatalyst comprises a conductive substrate and a core-shell type nano array structure vertically growing on the surface of the conductive substrate, a core in the core-shell type nano array structure comprises a tungsten-doped nickel-iron layered bimetal hydroxide nanosheet array, and a shell comprises cobalt phosphide. The bifunctional electrocatalyst shows excellent catalytic performance and stability in oxygen evolution and hydrogen evolution reactions, and has important application value in the field of electrocatalytic water decomposition.

The invention provides a Ru-NiCoP / NF self-supporting electrode and a preparation method and application thereof. According to the Ru-NiCoP / NF self-supporting electrode, foamed nickel serves as a matrix, ruthenium-doped nickel phosphide cobalt loaded on the foamed nickel serves as an active component, the ruthenium-doped nickel phosphide cobalt is of a three-dimensional composite nanostructure with a sea urchin-shaped morphology, Ru in the ruthenium-doped nickel phosphide cobalt contains two valence states of Ru < 3 + > and Ru0, Ni exists in the valence state of Ni < 2 + >, and Co contains two valence states of Co < 2 + > and Co < 3 + >. The Ru-NiCoP / NF self-supporting electrode has good catalytic activity in the hydrogen evolution reaction and oxygen evolution reaction process, and can be used for electrolyzing water.

This invention discloses a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid, its preparation method, and its application. The preparation method includes: S1, pretreating nickel foam (NF); S2, dissolving disodium hydrogen phosphate dodecahydrate and hexadecyltrimethylammonium bromide in a mixture of water and ethylene glycol, adding cobalt nitrate and stirring to obtain a precursor; S3, immersing the nickel foam in the precursor solution and refrigerating it overnight at low temperature; S4, transferring it to a reaction vessel and hydrothermally heating it at 160 °C for 10 hours to obtain cobalt phosphate (CoPO / NF); S5, using CoPO / NF as the working electrode, electrochemically depositing platinum in an H2PtCl6 and KOH electrolyte using cyclic voltammetry; S6, washing and vacuum drying to obtain the final product. This invention is the first to prepare a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid at 100 mA cm⁻¹. ‑2 With a working potential of only 0.67 V at current density (relative to RHE) and a Faraday efficiency of 100% for glycolic acid, it has significant advantages and application potential in the highly selective production of glycolic acid in the electro-oxidation reaction of ethylene glycol.

The invention discloses a composite electrocatalyst based on polyurethane foam, a preparation method and a battery. The composite electrocatalyst is nitrogen and sulfur co-doped carbon foam loaded with cobalt hydroxide nanosheets and CoP, and the specific surface area of the carbon foam is 186-211m < 2 > / g; the carbon foam is obtained by calcining a polyurethane foam-based transition metal composite material in an inert atmosphere at the temperature of 700-750 DEG C. According to the present invention, the cobalt hydroxide nanosheet and the cobalt phosphide are loaded so as to provide the rich self-supporting pore structure, such that the specific surface area of the electrocatalyst can be easily increased, and the cobalt hydroxide nanosheet and the cobalt phosphide are loaded so as to provide the rich adsorption site for the oxygen. Through co-doping of nitrogen and sulfur, the active sites of the electrocatalyst are further increased, and the kinetic efficiency of oxygen reduction reaction is improved. Moreover, in the oxygen reduction reaction process, the composite electrocatalyst is not prone to agglomeration, active substance falling and other problems, and therefore the circulation capacity of the oxygen reduction reaction can be improved.

The application provides a cobalt phosphide water electrolysis catalyst and a preparation method thereof, and the preparation method comprises the following steps: (1) soaking foam nickel in a polyvinylpyrrolidone solution, and obtaining modified foam nickel after reaction; (2) mixing a cobalt nitrate hexahydrate solution and a 2-methylimidazole solution to obtain a mixed solution, adding the modified foam nickel into the mixed solution, and obtaining a metal organic framework ZIF-67@foam nickel material after reaction; (3) carrying out a separated gas phosphorization reaction on the metal organic framework ZIF-67@foam nickel material under a nitrogen atmosphere, and obtaining the cobalt phosphide water electrolysis catalyst. The cobalt phosphide catalyst prepared in the application has a high specific surface area and porosity, is beneficial to the exposure of active sites, and has excellent water electrolysis catalytic performance.

The present invention relates to the technical field of nanomaterial preparation, and in particular to a process method for efficiently preparing nano-cobalt phosphide. The process method comprises a raw material preparation and solution preparation stage, a cobalt hydroxide nano-precipitate generation stage, a cobalt hydroxide precipitate collection and washing stage, a cobalt hydroxide and sodium hypophosphite pretreatment stage, a high-temperature phosphating reaction stage, a stirring and boiling phosphating stage, and a reaction product collection and processing stage. The process method of the present invention realizes efficient and batch preparation of nano-cobalt phosphide through a series of finely controlled steps. The method has the advantages of a simple reaction process, a short required time, high product purity, and uniform particle size distribution. By optimizing reaction conditions and controlling the reaction process, the quality and yield of the product can be further improved.

The invention belongs to the technical field of nano material synthesis, and relates to an iron-doped cobalt phosphide hollow nanocage hydrogen evolution catalyst and a preparation method thereof. The catalyst is a composite porous material of Fe-doped CoP nano-particles and nitrogen-doped carbon, and the Fe-doped CoP nano-particles coated with the nitrogen-doped carbon are uniformly loaded on dodecahedral porous nitrogen-doped carbon with the size of 200nm microcosmically. The preparation method comprises the following three steps: (1) reacting cobalt nitrate hexahydrate with 2-methylimidazole in methanol at room temperature, and centrifuging to obtain a ZIF-67 precursor; (2) performing oil bath reflux on ZIF-67 and potassium ferricyanide in ethanol-deionized water, and performing centrifugal drying to obtain a CoFe-PBAs precursor; and (3) annealing CoFe-PBAs for 2 hours at 400 DEG C under the protection of argon, thereby obtaining the target catalyst. The catalyst is excellent in hydrogen evolution activity in a whole pH range, 0.01 Acm <-2 > overpotentials in an acidic system, an alkaline system and a neutral system are 61mV, 133mV and 188mV respectively, only 1.91 V is needed for realizing 1.0 Acm <-2 > current density in a proton exchange membrane electrolytic cell, and the 200-hour operation voltage attenuation rate is as low as 0.1 mVh <-1 >. The method is simple in preparation process, low in cost, outstanding in catalyst activity and stability and suitable for industrial green hydrogen preparation scenes.

The application provides a composite lithium negative electrode material for a solid-state lithium metal battery and a preparation method and application thereof, the preparation raw material of the composite lithium negative electrode material comprises an additive, lithium metal and a solid-state electrolyte; the additive is selected from one or more of gallium phosphide, indium phosphide, tin phosphide, iron phosphide, cobalt phosphide, nickel phosphide, molybdenum phosphide, manganese phosphide, black phosphorus and red phosphorus. The composite lithium negative electrode material prepared by using the additive has good wettability to the solid-state electrolyte sheet, significantly reduces the interface resistance between the solid-state electrolyte and the lithium metal negative electrode, improves the critical current density and the cycle stability, is very close to the solid-state electrolyte sheet at the interface, has good matching with a commercial lithium iron phosphate positive electrode, and the assembled full battery has excellent rate performance and cycle performance.

The present invention provides a preparation method and application of a porous carbon film electrode modified with cobalt phosphide nanoparticles, belonging to the technical field of electrocatalysts. The preparation method of the porous carbon film electrode modified with cobalt phosphide nanoparticles is a green and scalable preparation method. First, taking low-cost biomass soybean as a natural source of carbon, nitrogen, and phosphorus, by applying the traditional method of preparing frozen tofu to transition metal phosphides (TMPs), an unprecedented "Co tofu" is prepared. After calcining the Co tofu, cobalt phosphide (Co 2 P) nanoparticles can be in-situ generated on the tofu-based carbon film to obtain a porous carbon film electrode modified with cobalt phosphide nanoparticles. Toxic reagents are not required for gas-phase phosphidation during the preparation process, and the environmental pollution is small. In addition, the porous carbon film electrode modified with cobalt phosphide nanoparticles prepared by the present invention has an overall structure and can be used as a bifunctional electrode for electrocatalytic water splitting, having excellent catalytic activities for hydrogen evolution reaction / oxygen evolution reaction (HER / OER).

This invention discloses a core-shell structured nickel-cobalt hydroxide / nickel-cobalt phosphide composite electrode and its preparation method, relating to the fields of materials engineering and manufacturing technology. The preparation method includes the following steps: adding nickel nitrate hexahydrate, cobalt nitrate hexahydrate, sodium citrate, potassium hydroxide, and ammonia to deionized water, and stirring to react to obtain nickel-cobalt hydroxide; placing sodium hypophosphite and nickel-cobalt hydroxide in a tube furnace and treating at high temperature under argon to obtain a nickel-cobalt phosphide composite material; mixing the nickel-cobalt phosphide composite material, PVDF, and carbon black to obtain a slurry, coating it on carbon cloth, and electrochemically activating it to obtain the composite electrode. The composite electrode of this invention has a large specific surface area and high resistance to OH-. ‑ It has strong adsorption capacity and abundant reactive sites; nickel cobalt hydroxide and nickel cobalt phosphide synergistically participate in the electrode reaction, giving the electrode an extremely high specific capacity; due to the heterostructure and the high conductivity of nickel cobalt phosphide, the electrode has excellent conductivity and excellent rate performance.

The present application relates to a kind of load CoP / Bi4TaO8Cl composite material, the composite material is made of layered Bi4TaO8Cl and cobalt phosphide nanoparticles composite, the layered Bi4TaO8Cl is carrier, the cobalt phosphide nanoparticles are loaded on the surface of carrier, form CoP / Bi4TaO8Cl heterojunction structure.Compared with the prior art, the present application selects Cl ‑ Based Bi4TaO8Cl as carrier.Compared with Br ‑ , Cl ‑ With stronger electronegativity, and Ta 5+ , Bi 3+ In the lattice, it is more firmly combined, so as to give the carrier higher structural stability.More importantly, this change makes Bi4TaO8Cl have more positive potential valence band top, and the photo-generated hole has stronger oxidation ability, and provides more sufficient and fundamental driving force for high-energy barrier water oxidation reaction (OER) in thermodynamics.

This disclosure provides systems, methods, and apparatus related to lithium-ion batteries. In one aspect, a method includes synthesizing an intermediate selected from a group of a nickel-manganese-cobalt nitrate, a nickel-manganese-cobalt acetate, a nickel-manganese-cobalt sulfate, a nickel-manganese-cobalt chloride, and a nickel-manganese-cobalt phosphate. The intermediate is mixed with a lithium salt selected from a group of LiOH, LiCl, LiNO3, LiSO4, LiF, LiBr, Li3PO4, Li2CO3, and combinations thereof to form a mixture. The mixture is annealed at a sequence of temperatures and times to form a plurality of single crystals of a lithium nickel-manganese-cobalt oxide, with no cooling of the mixture between operations of the sequence of temperatures and times.

The invention relates to the technical field of nano material preparation, in particular to a technological process for preparing nano CoP, which comprises the following steps: selecting cobalt powder with the particle size of about 20nm and red phosphorus powder with the particle size of about 30m, accurately weighing the nano cobalt powder and the red phosphorus powder according to the molar ratio of 1: 1 by using a precision electronic balance in a vacuum glove box, and uniformly mixing the nano cobalt powder and the red phosphorus powder; the glove box provides an oxygen-free environment to prevent raw materials from being oxidized, in the vacuum glove box, a proper stirring tool is used for evenly mixing the weighed nanometer cobalt powder and red phosphorus powder, and the stirring speed and time are controlled in the mixing process; sealing the mixed powder in a glove box into a metal tube, heating the metal tube in a tubular furnace to 700-1000K in an inert atmosphere, and keeping the temperature for 2 hours; finally, a sample is taken out after the temperature is reduced to the room temperature, grinding is conducted, and cobalt phosphide particles of 20-50 nm are obtained.The preparation technology and the application method of the nanometer CoP are provided, the technological process is simple, and the prepared nanometer CoP particles are small and high in catalytic performance.

The invention discloses a nickel cobalt phosphide electrochemical low-reduction-potential sensitive electrode based on a nitrite catalytic reduction mechanism, and a preparation method and application thereof, and belongs to the technical field of electrochemical sensing. The preparation method comprises the following steps: firstly, pretreating carbon cloth by adopting a strong acid mixed solution to enhance the hydrophilicity of the carbon cloth, cleaning for later use, and then dissolving a cobalt source, a nickel source and phosphate in deionized water according to a specific proportion to prepare an electro-deposition solution; and then, taking the pretreated carbon cloth as a working electrode, and performing electrodeposition on the surface of the working electrode by adopting a chronoamperometry to form a cobalt nickel phosphide nanoflower structure, so as to prepare the sensitive electrode. When the electrode is applied to nitrite detection, the electrode shows excellent electrocatalytic reduction activity in a system formed by a mercury / mercuric oxide reference electrode and a platinum counter electrode. The electrode prepared by the invention can realize high-sensitivity, rapid and low-potential detection of nitrite ions, and effectively solves the problems of insufficient sensitivity, high oxidation overpotential, poor selectivity and the like of an electrochemical nitrite sensor.

Provided is an industrially advantageous method by which it is possible to obtain, at a high yield, lithium cobalt phosphate having a single phase in X-ray diffraction measurements. A method for producing lithium cobalt phosphate according to the present invention is characterized by having: a first step for adding a carboxylic acid, cobalt hydroxide and, if necessary, a hydroxide of a metal (M) to an aqueous solvent, and then adding lithium carbonate to prepare an aqueous slurry (1); a second step for subjecting the aqueous slurry (1) to a wet grinding treatment using a media mill to obtain a slurry (2) containing a ground product; a third step for adding phosphoric acid to the slurry (2) containing a ground product so as to obtain a mixed raw material slurry (3); a fourth step for spray drying the mixed raw material slurry (3) to obtain a reaction precursor; and a fifth step for firing the reaction precursor.

The present invention relates to the technical field of LEDs. The present invention discloses an LED light source with a high color rendering index. By adding a compound capable of absorbing yellow-green visible light to the light-emitting formulation and matching the white light emitted by a blue light chip, the color rendering index of the LED lamp is improved. The compound for absorbing yellow-green visible light is preferably cobalt phosphate or lithium cobalt phosphate. By adding a relatively small mass ratio of cobalt phosphate or lithium cobalt phosphate, the effect of improving the color rendering index of the LED lamp can be achieved. The formulation is simple, and the materials are simple and easily available, solving the problems in the prior art that the formulation is complicated and the cost is relatively high due to the need to increase the types of phosphors or use long-wave nitrogen oxide red phosphors to improve the color rendering index.

A preparation method and application of a fluorine and iron co-doped cobalt phosphide material. The present invention aims to solve the problem that the recombination of the existing CoP catalyst only occurs in the surface layer during the OER process, and the reaction activity needs to be improved. Preparation method: First, soak and pretreat the carbon cloth in concentrated nitric acid at a temperature of 30-70 °C; Second, dissolve cobalt nitrate and iron nitrate in water, stir to obtain a reaction solution, and use a three-electrode system in the reaction solution for electrodeposition treatment; Third, place the carbon cloth growing with Fe-α-Co(OH)2 nanosheet arrays at the downstream of a high-temperature tube furnace, and sequentially place ammonium fluoride and sodium hypophosphite at the upstream of the tube furnace for calcination to obtain a fluorine and iron co-doped cobalt phosphide material. The fluorine and iron co-doped cobalt phosphide material of the present invention is used as an oxygen evolution electrode, and the introduction of F enhances the OER kinetics. The synergistic effect of F and Fe makes the recombination rate and recombination structure reach the optimal state. The fluorine and iron co-doped cobalt phosphide significantly improves the electrocatalytic performance.

To provide a method which can obtain cobalt lithium phosphate which is a single-phase in terms of x-ray diffractometry, with high yield in an industrially advantageous way.SOLUTION: A production method of cobalt lithium phosphate includes: a first step of adding carboxylic acid, cobalt hydroxide, and, if necessary, a metal (M) hydroxide to an aqueous solvent and then adding lithium carbonate to prepare aqueous slurry (1); a second step of wet milling-treating the aqueous slurry (1) with a media mill to obtain slurry (2) containing a milling treated product; a third step of adding phosphoric acid to the slurry (2) containing the milling treated product to obtain mixed raw material slurry (3); a fourth step of spray drying-treating the mixed raw material slurry (3) to obtain a reaction precursor; and a fifth step of firing the reaction precursor.SELECTED DRAWING: None

The present invention provides three-dimensional NiCoP / CoMoO4 composite nanorods, their preparation method, and applications. A cobalt source and a molybdenum source are first mixed in water, nickel foam is added, and a hydrothermal reaction is performed to produce cobalt molybdate. Alkaline etching and ion exchange are then performed to obtain NiCo(OH)2 / CoMoO4. This process is then followed by phosphating to produce NiCoP / CoMoO4. Compared to existing technologies, the three-dimensional NiCoP / CoMoO4 composite nanorods of the present invention possess large specific surface area and excellent electrical conductivity, making them suitable for use as high-performance hydrogen evolution electrocatalysts. Furthermore, the composite structure of nickel cobalt phosphide and cobalt molybdate enhances the electrical conductivity of the cobalt molybdate itself, thereby achieving higher catalytic efficiency.

The invention discloses a synthesis method of an iron-doped cobalt phosphide catalyst for hydrogen production through electrolysis of untreated seawater, and the method comprises the following steps: doping Fe into a cobalt-based catalyst precursor through a solution gel-vapor deposition method, and further phosphorizing in the vapor deposition process to form a Fe / Co2P structure; the high-performance seawater direct electrolysis oxygen desorption catalyst with a specific structure is obtained, and Fe doping is utilized to improve the catalytic activity of Co2P and inhibit dissolution of Co < 2 + >. The preparation method is simple and efficient, the electrode material has excellent OER activity and extremely high chlorine resistance in untreated natural seawater, only 1.866 V potential is needed when the current density in untreated neutral seawater reaches 100 mA. Cm <-2 >, and stable electrolysis can be carried out for more than 100 h. The catalyst has the advantages of low synthesis cost, high stability, good catalytic activity and the like, and provides a brand new material research and development thought for hydrogen production by electrolysis of alkalization-free seawater.