850 results about "Cobalt oxide" patented technology

The invention provides a lithium-rich manganese-based positive electrode active material and a preparation method and application thereof. The lithium-rich manganese-based positive electrode active material comprises a lithium-rich manganese-based core, a first coating layer and a second coating layer, the chemical formula of the lithium-rich manganese-based core is Li < 1 + x > Ni Mn M < c > O < 2 + x >; 0.25 < = x < = 0.4, a + b + c = 1, 0.33 < = a < = 0.35, 0.63 < = b < = 0.65, and 0 < = c < = 0.02; m is selected from at least one of W, Ta, Nb, Ti, Sb, Al, Mg, Zr, Sr and Mo; the first coating layer is X-doped nano layered lithium cobalt oxide, and X is selected from at least two of Al, La, Nb, Sr, Ti, Mn, Mo, Ta, W, K, B and F; and the second coating layer comprises a fast ion conductor and / or a spinel-like phase cobalt lithium compound. The positive electrode active material provided by the invention has excellent storage capacity.

The invention belongs to the technical field of energy storage materials, and particularly relates to a high-entropy oxide Fe0. 2Co0. 2Ni0. 2Cu0. 2Zn0. 2O and an ultrafast synthesis method and application thereof. According to the preparation method, ferroferric oxide, cobalt oxide, nickel oxide, copper oxide and zinc oxide with equal molar ratio are adopted as direct synthesis raw materials, toxic gases such as chlorine and nitrogen dioxide generated in the synthesis process of a metal salt precursor are avoided, and the uniformly distributed single-phase high-entropy oxide is synthesized in an ultrafast manner within 10 seconds by using a Joule heating technology; the synthesized high-entropy oxide is used as a lithium ion battery negative electrode material, and shows more excellent electrochemical performance and cycling stability compared with other high-entropy oxides prepared from transition metals with different proportions; in the preparation process, extra additives are not needed, operation is easy, the synthesis speed is high, the yield is high, element distribution is uniform, and the method has the advantages of being low in cost, high in efficiency and free of pollution and has the industrialization prospect.

The invention relates to the technical field of alloy materials, and discloses a preparation method of a nano WC-Co hard alloy for micro drilling, the nano WC-Co hard alloy comprises the following raw materials by weight: 83-92 wt% of nano tungsten carbide, 7-17 wt% of ultrafine cobalt oxide powder, 0-1.5 wt% of a hard alloy grain growth inhibitor, and 0.2-3 wt% of a forming agent; the method comprises the following steps: 1, mixing nano tungsten carbide, superfine cobalt oxide powder, vanadium carbide and a forming agent, and adjusting a carbon balance point in the powder to be mixed by using free carbon black; 2, sequentially putting the powder and a forming agent into a ball mill, and mixing the materials by taking absolute ethyl alcohol as a ball milling medium; the superfine cobalt oxide powder is used for replacing superfine cobalt powder, so that the extension area of cobalt element powder is increased, the problem that the cobalt powder is extended into a sheet shape is avoided, the cobalt pool phenomenon is effectively reduced, meanwhile, crystal grain growth inhibition carbides are increased, the phenomenon that a binding phase in hard alloy is not uniform is avoided, the service life of the finished micro-small-diameter drill bit special for the PCB is guaranteed, and the service life of the finished micro-small-diameter drill bit special for the PCB is prolonged. And the product quality is further improved.

The invention discloses an efficient combined regulator for easily-argillized copper oxide cobalt ore and a beneficiation method. The efficient combined regulator comprises the following components in parts by weight: 250-350 parts of sodium citrate and 1100-1200 parts of sodium hydrosulfide. Sodium citrate has high dispersing capacity, and the efficiency of selective adsorption between the argillization copper-cobalt ore and the medicament can be improved; meanwhile, the complexing ability of sodium citrate on ions, such as Fe, Ca and Mg, influencing agent adsorption on the surface of the ore is high, in addition, products obtained after complexing of the Fe, Ca and Mg ions can be dissolved in water, and action sites are provided for selective adsorption of a vulcanizing agent (NaHS) and a collecting agent amyl xanthate (PAX). According to the combined regulator and the beneficiation method provided by the invention, the problem of poor reagent selectivity in the flotation process of the argillization copper-cobalt ore can be obviously improved, the vulcanization effect of a vulcanizing agent is enhanced, and selective adsorption of a collecting agent is promoted, so that the recovery rate of copper and cobalt metals in the copper-cobalt oxide ore under the condition of serious ore argillization is improved.

The invention discloses a preparation method and application of a nickel-cobalt oxide modified molybdenum-doped bismuth vanadate composite photo-anode, and belongs to the application field of hydrogen production through water decomposition in photoelectrochemical reaction engineering. The preparation method comprises the following steps: obtaining a Mo-BiVO4 photo-anode through an electro-deposition and calcination combined method, preparing a precursor solution containing bimetallic nickel and cobalt by using cobalt nitrate hexahydrate, nickel nitrate hexahydrate and boric acid, immersing the Mo-BiVO4 photo-anode into the precursor solution, and growing a nickel-cobalt oxide (NiCoOx) cocatalyst on the surface of Mo-BiVO4 by using a photo-assisted electro-deposition method, thereby obtaining the Mo-BiVO4 photocatalyst. According to the NiCoOx cocatalyst modified Mo-BiVO4 composite photoanode and the preparation method thereof, the photocurrent density of the optimal NiCoOx cocatalyst modified Mo-BiVO4 composite photoanode obtained by the preparation method disclosed by the invention is 5.2 times that of pure bismuth vanadate. The preparation method has the advantages of simple operation method, easily available raw materials, low economic cost and good stability.

The invention belongs to the technical field of catalysts, and particularly relates to a supported Co-based catalyst with a nano molybdenum carbide auxiliary as well as a preparation method and application of the supported Co-based catalyst. The preparation method comprises the following steps: depositing molybdenum oxide on the surface of a carrier material by adopting an atomic layer deposition method, then carrying out carburizing treatment to obtain a molybdenum carbide catalyst, depositing cobalt oxide on the surface of the molybdenum carbide catalyst by adopting the atomic layer deposition method, and then carrying out reduction treatment to obtain the supported cobalt-based catalyst with the nano molybdenum carbide assistant. According to the preparation method provided by the invention, the size of molybdenum carbide and the dispersity and valence state of cobalt are controlled by regulating and controlling the deposition times of molybdenum oxide, and the prepared catalyst has excellent catalytic activity and stability in the hydroformylation reaction of long-chain olefin with the carbon atom number being greater than or equal to 5.

The present invention relates to: an electrochemical biosensor capable of effectively and sensitively detecting alfuzosin; an electrode applied thereto; a metal-organic framework (MOF) which includes a zinc / cobalt oxide and is applied in manufacturing the electrode; and methods for manufacturing same.

The invention relates to the technical field of metallurgy, in particular to an efficient-utilization copper-cobalt ore dump leaching treatment method which comprises the steps that after copper-cobalt sulfide ore and copper-cobalt oxide ore are subjected to crushing treatment respectively, heap building is conducted; a solution of acidithiobacillus ferrooxidans is added into a sulfuric acid solution to serve as spraying liquid, heap leaching treatment is conducted on the heap-built copper-cobalt ore through a spraying device, and the spraying flow of the spraying device is controlled in the heap leaching treatment process according to changes of the environment temperature and humidity and changes of the pH value of heap leaching liquid; the obtained dump leaching liquid is subjected to extraction-electrodeposition treatment, and cathode metal copper, sediment and raffinate are obtained; and the raffinate serves as spraying liquid to be subjected to spraying circulation, precipitation is neutralized, and metal cobalt is recycled. The spraying flow of the spraying device is accurately controlled and adjusted, and the leaching effect of copper and cobalt metal in the copper-cobalt ore is improved.

The invention relates to the technical field of hydrometallurgy, in particular to a method for selectively leaching and separating cobalt and manganese from crude cobalt hydroxide leaching residues. The separation method provided by the invention comprises the following steps: S1, pre-reduction treatment; and S3, cobalt is leached through selective oxidation, and manganese is precipitated. According to the separation method, the synergistic effect of ORP and pH is regulated and controlled, proper reducing agents and oxidizing agents are selected, cobalt is selectively leached through step-by-step oxidation, dissolution of manganese is inhibited, manganese circularly entering a leaching and extraction system is reduced, the leaching and extraction operation cost is reduced, meanwhile, a selective complexing agent is introduced, impurity co-dissolution is reduced, the subsequent purification process is simplified, and the method is suitable for industrial production. The preparation method is simple to operate and easy for industrial production, and has a good application prospect.

The invention relates to the technical field of methane cracking and hydrogen production, and discloses a metal-modified Co-Bi liquid alloy catalyst, wherein the catalyst uses Co as an active component, uses Bi low melting point metal as a solvent, and uses a third metal M as an auxiliary agent; the invention also discloses a method for preparing the catalyst, comprising: calcining a cobalt salt to generate cobalt oxide, and then forming CoO-MO X The mixture powder was finally heated under N2 and H2 atmosphere to obtain CoO‑MO X The powder is mixed with elemental Bi to obtain a cobalt-bismuth ternary liquid alloy catalyst; the present invention also discloses a method for applying the catalyst to methane cracking and hydrogen production, comprising: heating the preheating furnace to a certain temperature, introducing pure methane gas, and reacting under normal pressure, at a temperature of 500 to 700°C, with a methane space velocity of 1 to 100 mL / g·min, and after the reaction is completed, the temperature drops to room temperature in an N2 atmosphere, and the carbon product is taken out of the reaction tube after cooling. The catalyst disclosed by the present invention has the advantages of high activity, good stability, strong methane cracking ability, mild reaction conditions, simple preparation process, and long life.

The application provides a method for grading diesel deep hydrodesulfurization catalysts, which comprises the following steps: loading catalysts containing AlPO4-5 phosphorus aluminum molecular sieves and catalysts containing ETS-10 titanium silicon molecular sieves in the upper and lower parts of a fixed bed hydrogenation reactor respectively according to a loading mass ratio of 1:3-3:1, so that diesel is subjected to hydrodesulfurization reaction through catalysts containing AlPO4-5 phosphorus aluminum molecular sieves first and then through catalysts containing ETS-10 titanium silicon molecular sieves; the carrier of the catalysts containing AlPO4-5 phosphorus aluminum molecular sieves comprises AlPO4-5 phosphorus aluminum molecular sieves and aluminum oxide powder, the carrier of the catalysts containing ETS-10 titanium silicon molecular sieves comprises ETS-10 titanium silicon molecular sieves and aluminum oxide powder, and the active components of the two kinds of catalysts respectively comprise a combination of two or three of nickel oxide, molybdenum oxide and cobalt oxide. The sulfur content of the hydrogenated diesel obtained through the method can be as low as 10 μg / g or below.

The invention relates to the field of architectural ceramics, and discloses a sapphire effect dry particle, a ceramic tile with a sapphire imitation effect and a preparation method of the ceramic tile. The sapphire effect dry granules comprise blue dry granules and transparent dry granules, wherein the blue dry granules are prepared from the following raw materials: 1.5 to 3.5 parts of superfine tin dioxide, 15 to 19.5 parts of cobalt oxide, 4.5 to 7.5 parts of titanium oxide, 8 to 14 parts of zinc oxide, 32 to 43 parts of calcined aluminum oxide, 8 to 13 parts of quartz, 10 to 16 parts of potassium feldspar and 2.5 to 4.5 parts of boric acid; the transparent dry particles comprise the following raw materials in parts by weight: 8-15 parts of zinc oxide, 5-10 parts of aluminum oxide, 24-28 parts of quartz, 1-2.5 parts of nano silicon nitride and 7-11 parts of cryolite. By mixing the two dry granules, the frit dry granules which have a three-dimensional effect and an ice crack texture and imitate the texture of sapphire crystals can be prepared. The ceramic tile with the sapphire-like effect can be prepared by adopting the dry particles with the sapphire effect.

The invention relates to a composite nanodot loaded porous carbon nitride photocatalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: calcining a precursor formed by mixing melamine, cyanuric acid and trithiocyanuric acid to obtain porous carbon nitride, and loading cobalt oxide nanodots and nickel nanodots on the porous carbon nitride in two steps, the composite nanodot loaded porous carbon nitride photocatalyst with excellent visible light catalytic hydrogen production performance is obtained; when the composite nanodot loaded porous carbon nitride photocatalyst obtained by the method is used for photocatalytic hydrogen production, an activity test result shows that the activity of the photocatalyst prepared by the method is improved by 222.5 times compared with that before modification; the preparation method disclosed by the invention has the advantages of high reaction efficiency and good performance of the obtained photocatalyst, and has a wide application prospect.

The invention provides a wet treatment process for laterite-nickel ore. The wet treatment process comprises the following steps: S1, carrying out acid leaching treatment on the laterite-nickel ore by adopting inorganic acid to obtain leached ore pulp; s2, the leached ore pulp is sequentially subjected to liquid-solid separation and countercurrent washing, and washed pulp and leached residues are obtained; s3, a first oxidizing agent and a first neutralizing agent are added into the washed slurry for iron and aluminum removal treatment, and a solution with iron and aluminum removed and iron and aluminum slag are obtained; s4, carrying out nickel and cobalt precipitation treatment on the solution subjected to iron and aluminum removal, so as to obtain precipitated slurry; s5, continuously carrying out dense separation treatment on the precipitated slurry to obtain underflow and overflow; and S6, the underflow is subjected to washing aftertreatment in sequence, and a cobalt nickel hydroxide product is obtained. The invention provides a short-process wet treatment process for laterite-nickel ore, the production cost and energy consumption are reduced, and meanwhile, the recovery rate of nickel and cobalt, the overall recovery rate of scandium and the quality of nickel-cobalt oxide products are improved.

The invention discloses a modified metal oxide catalyst and a plasma coupling electro-catalysis ammonia synthesis system based on the catalyst, cobalt oxide is modified by using radio frequency inductively coupled plasma (ICP) under a vacuum condition and an argon atmosphere, and the cobalt oxide catalyst rich in defects is obtained after discharging is finished. The ammonia synthesis system comprises a plasma activated air system and an electrocatalytic ammonia synthesis system; carrying out plasma discharge on air to generate NOX, cooling, and introducing the NOX into the absorption liquid; the absorption liquid is used as catholyte for electrocatalytic ammonia production in an H-shaped pool, and a cobalt oxide catalyst modified by plasma treatment is selected as a cathode. The cobalt oxide is treated by ICP, so that the problems of low conductivity, inert surface and the like of metal oxide are solved, and the performance of the catalyst is improved. The method solves the problems that plasma air discharge products are complex, and the ammonia yield is low due to the fact that N is equivalent to N cannot be efficiently activated through electro-catalysis.

The invention discloses a preparation and application method of active magnesium oxide for cobalt precipitation, which comprises the following steps: adding acetate during preparation of an active magnesium oxide precursor magnesium hydroxide to obtain magnesium hydroxide with a double-tooth structure; when magnesium oxide is prepared through calcination, conversion from magnesium hydroxide to magnesium oxide can be achieved at a low temperature, and meanwhile high activity is obtained; and finally, the magnesium oxide slurry is added into the cobalt precipitation pre-solution for cobalt precipitation, the cobalt precipitation effect is good, and the obtained coarse cobalt hydroxide cobalt is high in grade. The magnesium hydroxide regulating agent is used for promoting generation of magnesium oxide rich in active sites, the magnesium hydroxide regulating agent is applied to the wet metallurgy cobalt deposition process, the cobalt deposition effect of active magnesium oxide prepared through a chemical method is effectively improved, other methods except for the method for reducing the particle size and promoting the activity of magnesium oxide are developed, acetate is selected as the magnesium hydroxide regulating agent, the dosage is small, and the cost is low. Magnesium oxide obtained through calcination is high in purity, the cobalt deposition process is not affected, unit consumption of magnesium oxide can be reduced, and cost is saved.

The invention discloses a foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoS / NiS. The foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoS / NiS is prepared by the following steps: firstly, taking foamed nickel NF as a substrate, loading cobalt hydroxide on the surface of the NF through first electrodeposition, then converting the NF into ZIF-67 through an impregnation method, then vulcanizing through thioacetamide and hydrothermal reaction, and finally loading Ni3S2 nanoparticles through second electrodeposition. The nickel foam loaded cobalt sulfide / nickel sulfide NF-CoS / NiS can be obtained. The preparation method comprises the following steps: 1, preparing foamed nickel electro-deposition cobalt hydroxide; 2, preparation of the foamed nickel loaded cobalt hydroxide / ZIF-67; 3, cobalt hydroxide / cobalt sulfide NF-Co / CoS is loaded on the foamed nickel; and 4, preparation of the foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoSX / Ni3S2. When the material is used as a supercapacitor material, charging and discharging are carried out in a voltage window range of 0-0.5 V, and when the current density is 1mA cm <-2 >, the area specific capacitance is 8-9F cm <-2 >; and when the current density is 10mA cm <-2 >, 70-80% of the initial capacity is still kept after 5000 charge-discharge cycles are carried out.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises a negative pole piece, a positive pole piece and an electrolyte, the battery monomer comprises a negative current collector and a negative film layer arranged on at least one side of the negative current collector, the negative film layer comprises a negative active material, and the negative active material comprises a carbon-based material; the positive pole piece comprises a positive pole current collector and a positive pole film layer arranged on at least one side of the positive pole current collector, the positive pole film layer comprises a positive pole active material and a positive pole additive, and the positive pole active material comprises the positive pole additive which comprises at least one of lithium-containing iron oxide and lithium-containing cobalt oxide; the electrolyte comprises an organic solvent, the organic solvent comprises a carboxylic ester solvent, and the mass content of the carboxylic ester solvent in the electrolyte is 3%-70%. The high-temperature cycle performance of the battery monomer can be further improved.

The application discloses a composite precipitant for wet refining of laterite nickel ore and a wet refining method of laterite nickel ore. The composite precipitant for wet refining of laterite nickel ore is composed of a mixture of magnesium oxide and sodium hydroxide, and the mass fraction of sodium hydroxide in the composite precipitant is greater than 0 and less than or equal to 99%. The wet refining method of laterite nickel ore comprises the following steps: directly or after being grinded, the composite precipitant is added into an acidic solution to be refined, and stirring is performed to make the composite precipitant fully react with the acidic solution to be refined; after concentration, a clear liquid and a solid-containing slurry are obtained; the solid-containing slurry is filtered and washed with water to obtain a solid containing nickel hydroxide, cobalt hydroxide or nickel hydroxide-cobalt hydroxide, so that nickel, cobalt or nickel-cobalt is precipitated. The composite precipitant and the wet refining method of laterite nickel ore have the advantages of simple process, low cost, easy process control, easy settlement and filtration of nickel hydroxide (and cobalt hydroxide) precipitation, and the production efficiency can be significantly improved and the energy consumption can be reduced.

The invention relates to the technical field of drying, in particular to a flash evaporation drying device for cobalt hydroxide production, which comprises a drying cylinder, fan blades, a ceramic ring and a first-stage separation assembly, a drying cavity is formed in the drying cylinder, the fan blades are rotatably arranged at the lower part of the drying cavity, and the fan blades can rotate around the axis of the fan blades; and the ceramic ring is arranged at the upper part of the drying cavity and used for driving the air in the drying cavity to spirally move from bottom to top. The first-stage separation assembly is arranged, materials which are not discharged out of the drying cavity through the pottery ring can fall into the first vortex disc, the materials with different particle sizes are adaptively crushed in the first vortex disc, so that the particle uniformity of the materials entering the drying cavity again from the first vortex disc is improved, and in addition, the larger the particle size of the materials is, the larger the particle size of the materials is, the larger the particle size of the materials is. And the retention time of the materials in the first-stage separation assembly is longer, so that the temperature uniformity of the materials is also improved.

The invention provides an iridium / cobaltosic oxide mesoporous monocrystal oxygen evolution catalyst and a preparation method thereof, and relates to the technical field of catalyst preparation, and the preparation method comprises the following steps: S1, preparing a mesoporous monocrystal cobalt hydroxide sheet; s2, dispersing mesoporous monocrystal cobalt hydroxide and an iridium-containing compound in an ethanol-water mixed solution, heating to a certain temperature, stirring to react for a period of time, and then washing and drying a reaction product; and S3, roasting the dried reaction product in an air atmosphere for a period of time to obtain the catalyst. The catalyst disclosed by the invention has high Ir load, extremely low overpotential and ultrahigh stability, and has huge potential in practical application of electrolyzed water.

A coated cathode material for lithium-ion batteries is disclosed. Methods and systems are further provided for applying a coating to an active cathode material for use in a lithium-ion battery. In one example, the coated cathode material may include a high-nickel content active cathode material, such as lithium nickel manganese cobalt oxide or lithium nickel aluminum cobalt oxide, coated with a coating including one or more high energy density active materials, such as lithium vanadium fluorophosphate and / or a lithium iron manganese phosphate compound. In some examples, the high-nickel content active cathode material may include greater than or equal to 60% nickel content.

The invention discloses a method for recovering platinum and palladium from high-cobalt nickel-containing carbonylation slag, and relates to the technical field of non-ferrous metal carbonylation metallurgy, the method comprises the following steps: S1, hydrogen reduction and activation; s2, feeding into a high-pressure carbonylation reactor; and S3, efficient carbonylation. According to the method, the carbonylation slag is subjected to hydrogen reduction activation treatment, nickel protoxide and cobalt oxide are changed into simple substance nickel, the simple substance nickel is fed into a carbonylation reactor for carbonylation under the protection of reducing gas or inert gas after activation treatment, 95% of Ni, 85% of Fe and 80% of Co are carbonylated to enter a gas phase after carbonylation, bonding of cobalt and a platinum solid solution is broken through carbonylation, and the nickel-cobalt-cobalt-cobalt-cobalt alloy is obtained. Nickel protoxide is difficult to dissolve in various strong acids and oxidizing acids, and a foundation is laid for further separation of base metals and non-metallic element sulfur from precious metals to produce high-grade platinum concentrate.

The invention discloses porous chlorine dioxide slow-release preservative paper and a preparation method thereof.The porous chlorine dioxide slow-release preservative paper comprises a paper base, a porous carrier is fixed to the paper base through oxidized starch glue, and sodium chlorite, an activating agent and a stabilizing agent are loaded on the porous carrier; the porous carrier is one of aluminum oxide, titanium oxide, cobalt oxide, zinc oxide, copper oxide, iron oxide, cerium oxide, zirconium oxide, nickel oxide, manganese oxide, praseodymium oxide and lanthanum oxide with a porous structure. The slow release of chlorine dioxide can be stably and effectively realized, the release period of chlorine dioxide is prolonged, and long-acting stable sterilization and disinfection effects are realized.

The present invention discloses a novel gas-sensitive material, specifically a method for preparing a core-shell nanofiber gas-sensitive material based on a platinum-doped cobalt oxide / tin oxide heterostructure. The present invention utilizes a cobalt source, a tin source, a platinum source, and a polymer as raw materials, and produces a nanoscale platinum-doped cobalt oxide / tin oxide gas-sensitive material with high sensitivity and rapid response to hydrogen sulfide gas via coaxial electrospinning. This gas-sensitive material exhibits excellent gas-sensing properties for H2S gas at room temperature, with a short response time, enabling rapid detection of low-concentration H2S gas, a short recovery time, and excellent cyclic stability. Therefore, the gas-sensitive material of the present invention possesses excellent sensitivity and stability, and has broad application prospects, including applications in environmental monitoring, industrial safety, and gas sensors.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a preparation method of a high-dispersion platinum group noble metal-based catalyst, which comprises the following steps: preparing a porous rod-like cobaltosic oxide carrier material, cleaning with deionized water, drying, and roasting for 4-8 hours; dissolving chloroplatinic acid or platinum chloride in deionized water to form a noble metal solution; soaking the treated cobaltosic oxide carrier in a noble metal solution, taking out the carrier from the solution after soaking is completed, filtering, cleaning, drying, and roasting for 4-6 hours in an inert gas atmosphere; and keeping the temperature and reducing for 2-4 hours in a hydrogen atmosphere. When the porous rodlike cobaltosic oxide carrier material is prepared, firstly, a cobalt chloride solution is poured into the lower part of the double-layer cavity for stirring, a urea solution drips into the cavity through a spray head in the stirring process, a stirring barrel is turned over after stirring is completed, the stirred solution flows out and is filtered, the cobalt chloride solution and the urea solution are continuously added into the double-layer cavity for stirring and mixing, and the porous rodlike cobaltosic oxide carrier material is prepared. Therefore, the porous rod-like cobalt oxide solvent material is efficiently prepared.

The invention relates to the field of photoelectrocatalytic materials, and discloses a photoelectrocatalytic material and a preparation method and application thereof.The photoelectrocatalytic material is formed by a bismuth molybdenum oxide and nickel-doped cobalt oxide heterostructure, the surface plasma resonance effect of gold nanoparticles and a conductive network of nitrogen-doped graphene and carbon quantum dots are combined, and a graded micro-nano structure is constructed; according to the present invention, the material has characteristics of high light current density, low charge transfer resistance and excellent catalytic activity and long-term stability in liquid-phase degradation and gas-phase oxidation through the built-in electric field and the optimization of the conductive network, such that the material has characteristics of high light current density and low charge transfer resistance, and can be used in liquid-phase degradation and gas-phase oxidation. The material is widely applicable to the fields of pollutant degradation, gas conversion, water photoelectrolysis and the like, and an efficient solution is provided for innovative development of a photocatalysis technology.

A cobalt-coated sodium ion battery precursor, and a preparation method and use therefor. The cobalt-coated sodium ion battery precursor sequentially comprises, from inside to outside, a core, a transition layer and an outer coating layer. The core comprises a nickel-iron-manganese precursor material. The transition layer comprises a nickel-iron-manganese-cobalt precursor material. The coating layer comprises a cobalt hydroxide material. By carrying out gradient coating of cobalt on the nickel-iron-manganese core, cobalt is sequentially increased from inside to outside, such that the surface structure stability of the nickel-iron-manganese precursor is improved, side reaction between the electrode and the electrolyte is inhibited, and the use voltage and rate capability of the sodium-ion battery are effectively improved.

The invention relates to a battery material preparation technology, in particular to a method for preparing high-purity cobaltous sulfate from crude cobaltous hydroxide, which comprises the following steps: S1, reacting the crude cobaltous hydroxide with sulfuric acid to generate magnesium sulfate; s2, washing to remove magnesium; s3, adding sulfuric acid and hydrogen peroxide into the crude cobalt hydroxide after magnesium washing; adding crude cobalt hydroxide to adjust the pH value to obtain a purified solution; s4, adding sodium fluoride into the purified liquid, and filtering after reaction to obtain filtrate; s5, saponifying with sodium hydroxide by using an acidic extractant, then performing soap conversion by using a cobalt sulfate solution, extracting manganese in the filtrate by using an obtained organic phase, and then performing reverse extraction on the organic phase by using sulfuric acid to obtain a manganese sulfate solution; s6, the raffinate obtained after manganese extraction is introduced into an adsorption tower loaded with a zirconium-based composite fluorine adsorbent; and S7, concentrating and crystallizing the defluorinated solution. According to the method, the zirconium-based composite fluorine adsorbent is introduced to be coupled with the process, fluorine ions can be removed, and cobalt loss caused by cobalt fluoride precipitation and the influence of the fluorine ions on the quality of a cobalt sulfate product are avoided.

The present disclosure belongs to the field of batteries, and particularly relates to cobalt hydroxide and a preparation method therefor, a positive electrode material, a battery and electrical equipment. Provided in the present disclosure is cobalt hydroxide, the particles of which are in the shape of a sheet and have an average thickness of 10-20 nm. The cobalt hydroxide of the present disclosure is nanosheets having an extremely small average thickness and a larger surface area, which can thus improve the coating effect thereof on a positive electrode material, thereby effectively inhibiting the formation of a nickel oxide rock salt-like phase in the positive electrode material, reducing the concentration of residual lithium on the surface of the positive electrode material and enabling lithium ions to be quickly deintercalated / intercalated; therefore, the electrical properties of the positive electrode material prepared therefrom can be significantly improved.