78 results about "Cobalt oxide" patented technology

This invention provides a photocatalytic composite nanoenzyme self-cleaning coating, its preparation method, and its application. Specifically, it includes: preparing solution A with Ca(NO3)2·4H2O and nano-cerium oxide; preparing solution B with (NH4)2HPO4 and hexadecyltrimethylammonium bromide; mixing solutions A and B, and reacting at high temperature to obtain cerium oxide nanoenzyme / hydroxyapatite microspheres; and using (NH4)6Mo7O... 24 Solution M is prepared by dissolving Fe(NO3)3·9H2O in deionized water; solution N is prepared by dissolving Fe(NO3)3·9H2O in deionized water; solutions M and N are mixed to obtain a precursor; the precursor is reacted with cobalt oxide at high temperature to obtain Co / Fe2(MoO4)3; tetraethyl orthosilicate, anhydrous ethanol, deionized water, and ammonia are mixed and sealed for aging; after adding a modifier, it is mixed with cerium oxide nanoenzyme / hydroxyapatite microspheres and Co / Fe2(MoO4)3, sprayed onto the obtained composite coating, and cured at high temperature to obtain a self-cleaning coating. This invention, by loading a photocatalyst and nanoenzyme / hydroxyapatite microspheres onto the surface of a modified SiO2 gel, effectively improves the photocatalytic activity and self-cleaning performance of the coating while maintaining good optical transmittance.

Provided is a method for separating impurities and cobalt without using an electrolysis process from a cobalt chloride solution containing impurities and producing a high purity cobalt sulfate. The production method for cobalt sulfate includes: a copper removal step (S1) of adding a sulfurizing agent to a cobalt chloride solution containing one or more impurities of copper, zinc, manganese, calcium, and magnesium and generating a precipitate of sulfide of copper to separate to remove copper; a neutralization step (S2) of adding a neutralizer or a carbonation agent to a cobalt chloride solution having undergone through the copper removal step (S1) and generating cobalt hydroxide or basic cobalt carbonate to separate magnesium; a leaching step (S3) of adding sulfuric acid to the cobalt hydroxide or the basic cobalt carbonate to obtain cobalt sulfate solution; and a solvent extraction step (S4) of bringing an organic solvent containing an alkyl phosphoric acid-based extractant to the cobalt sulfate solution and extracting zinc, manganese, and calcium into the organic solvent to separate to remove zinc, manganese, and calcium. These steps are sequentially executed.

This invention discloses a black-based blue-spotted glaze with an earthworm-like pattern and its preparation method. The glaze consists of a body, a black base glaze, and a blue-spotted glaze from the inside out. The raw materials for the black base glaze are: feldspar, calcite, calcium borate, dolomite, talc, barium carbonate, quartz, bentonite, zirconium silicate, rutile, cobalt oxide, manganese oxide, and iron oxide. The raw materials for the blue-spotted glaze are: feldspar, limestone, alumina, talc, barium sulfate, Datong clay, zinc oxide, quartz, and titanium dioxide. The preparation method includes: 1. Wet ball milling the black base glaze raw materials to obtain a black base glaze slurry; 2. Wet ball milling the blue-spotted glaze raw materials to obtain a blue-spotted glaze slurry; 3. Bisque firing the body; 4. Applying the black base glaze slurry to the body and drying it; 5. Applying the blue-spotted glaze slurry to the body and drying it; 6. Oxidation firing and reduction firing of the body, followed by natural cooling to obtain the black-based blue-spotted glaze. The raw material formula of this invention is reasonable and environmentally friendly, which can improve the mechanical properties of the glaze; the preparation method is simple and the yield is high.

This invention discloses a method for preparing sheet-like nano-sized cobalt hydroxide. The method includes the following steps: using cobalt nitrate as the cobalt source and sodium hydroxide solution as the precipitant, a co-precipitation reaction is carried out. The cobalt nitrate solution and sodium hydroxide solution are added together to a reaction vessel. By controlling the synthesis pH and temperature, the synthesized cobalt hydroxide slurry is washed with hot pure water, dried, and crushed using an air jet mill to obtain sheet-like nano-sized pink cobalt hydroxide with low sodium content. Specifically, the key to preparing sheet-like nano-sized cobalt hydroxide is to prevent oxidation and particle agglomeration during the synthesis process. This invention uses a low-temperature (40-60℃), low-pH (8.0-9.0) cobalt hydroxide synthesis process with a small amount of antioxidant added to prepare sheet-like micron-sized cobalt hydroxide that is not easily oxidized or agglomerated. In addition, at the low pH, the sodium content is low, making the subsequent filtration and washing steps easier to operate.

This invention relates to a biomass char composite electrocatalyst supported on nickel-cobalt sulfides, its preparation, and its application. The preparation method includes: subjecting biomass material to high-temperature carbonization to obtain a biomass char substrate with a porous structure; immersing the biomass char substrate in a solution containing nickel and cobalt salts, and obtaining biomass char supported on nickel-cobalt oxides through a hydrothermal reaction; placing the biomass char supported on nickel-cobalt oxides in a solution containing a sulfur source, and obtaining the biomass char composite electrocatalyst supported on nickel-cobalt sulfides through a hydrothermal reaction. The biomass char composite electrocatalyst supported on nickel-cobalt sulfides of this invention can be applied in biomass electrocatalytic oxidation reactions, achieving selective control of the biomass oxidation reaction and oxygen evolution reaction through an external magnetic field, thereby improving the efficiency of high-value conversion of biomass. The magnetic field control method of this invention has advantages such as non-contact control, simple system, and strong applicability, and has good application prospects.

This application discloses a cobalt-supported peanut shell biochar / peracetic acid synergistic system for water treatment and its application. The synergistic system includes cobalt-supported peanut shell biochar, peracetic acid, and water. The cobalt-supported peanut shell biochar comprises a peanut shell biochar matrix and cobalt-containing substances supported on the matrix. The cobalt-containing substances include metallic cobalt and / or cobalt oxides. The mass ratio of cobalt-supported peanut shell biochar to peracetic acid is (2-132):1. The atomic ratio of cobalt to carbon in the matrix is ​​(0.2-0.3):1. The cobalt-supported peanut shell biochar has a mesoporous structure with a total pore volume of not less than 0.07 cm³ / g and a specific surface area of ​​not less than 100 m². 2 / g. When this synergistic system is used to treat water containing organic pollutants, especially sulfamethoxazole, it can achieve a removal rate of over 90% within 3-5 minutes. The system maintains high activity and good stability over a wide pH range and in the presence of common anions, exhibiting excellent continuous operation performance. The degradation pathway of this synergistic system is environmentally friendly and can effectively reduce the toxicity of the products.

The application relates to a preparation method of a nano WC-Co-based composite powder with inhibitor uniform distribution, and belongs to the technical field of powder preparation. In the application, tungsten oxide and cobalt oxide with large brittleness are used as raw materials, the raw materials are easily broken in a ball milling process, the superfine and nano particle size of a precursor mixed powder containing an inhibitor and the uniform distribution of the raw materials are ensured, the precursor of the inhibitor is dissolved in anhydrous ethanol, a solution is formed, and the solution is mixed with other raw materials, so that the uniform distribution of the component of the inhibitor element in the precursor mixed powder containing the inhibitor is ensured. Polyethylene glycol is added in the ball milling process, the agglomeration of powder particles is reduced, the friction between the powder particles is reduced, and the flowability of the particles is increased. Through the matching of precursor components, the density of the mixed powder of the inhibitor-containing compact and a stage-by-stage heating process, the full reaction of the compact is ensured, the rapid discharge of generated gas is ensured, and through the further ball milling treatment of the prepared powder, the powder is ensured to have the characteristics of pure phase, small WC particle size and uniform component distribution.

This invention provides a one-dimensional silver nanostructure / metal hydroxide composite material, its preparation method, and its application. The preparation method includes: adding a one-dimensional silver nanostructure, a metal salt, and an additive to a solvent and stirring to disperse them evenly; adding an acidic or alkaline reagent under stirring conditions to adjust the pH of the solution, causing the metal ions in the solution to convert into metal hydroxide precipitates, obtaining a one-dimensional silver nanostructure-metal hydroxide suspension; then performing solid-liquid separation, washing and drying the obtained solid product to obtain a one-dimensional silver nanostructure / metal hydroxide composite powder; wherein the metal hydroxide is aluminum hydroxide, zinc hydroxide, magnesium hydroxide, iron hydroxide, manganese hydroxide, copper hydroxide, nickel hydroxide, or cobalt hydroxide, and the one-dimensional silver nanostructure is silver nanowire or silver nanoribbon. The resulting composite material uses metal hydroxide as a carrier and separator, inhibiting the drying and agglomeration of silver nanowires from the source, exhibiting high conductivity and good redispersibility, thus improving conductivity.

A ceramic material, includes: a magnesium oxide and a doped oxide, wherein the doped oxide includes cobalt tetroxide, europium trioxide or manganese dioxide, and wherein a weight ratio of magnesium oxide to the doped oxide is 97:1 to 85:12. In addition, the disclosure also provides a method for manufacturing a ceramic material, including: mixing a magnesium oxide powder and a doped oxide powder, and sintering the mixed magnesium oxide powder and the doped oxide powder at a temperature of 1300° C. to 1650° C. to obtain the ceramic material, wherein the doped oxide powder includes a cobalt tetroxide powder, a europium trioxide powder or a manganese dioxide powder, and wherein a weight ratio of the magnesium oxide powder to the doped oxide powder is 99.9:0.1 to 92:8.

The application belongs to the technical field of catalyst synthesis, and discloses a method for synthesizing a foam nickel loaded copper cobalt oxide catalyst, wherein CuCl2.2H2O and CoCl2.6H2O are used as copper sources and cobalt sources, the copper cobalt ratio is 7:3, foam nickel is used as a carrier, and Cu7Co3 / NF 500℃ oxide is synthesized at an annealing temperature of 500 DEG C. The catalyst is characterized by SEM, and has a structure of bristle-shaped nanoparticles. The catalyst can effectively accelerate the reduction reaction of 4-NP and reduce 4-NP into 4-AP. During the use of the catalyst for 5 cycles, the catalytic effect gradually increases and then stabilizes. After 5 cycles, the morphology of the catalyst is characterized by SEM, and the morphology is still a bristle-shaped structure. The application provides a stable, efficient and recyclable organic pollutant catalyst and a manufacturing method thereof, and the catalyst is suitable for being used as a catalyst for 4-NP reduction reaction.

Aspects of a one-step method for synthesizing monocrystalline LiNixMnyMzCo1-x-y-zO2 include heating a solid hydroxide precursor comprising NixMnyMzCo1-x-y-z(OH)2 and a molar excess of a lithium compound in an oxygen-containing atmosphere at a temperature T for an effective period of time t to form monocrystalline lithium nickel manganese cobalt oxide (NMC) having a formula LiNixMnyMzCo1-x-y-zO2. In the formula, M represents one or more dopant metals, 0.6≤x<1, 0.01≤y<0.2, 0≤z≤0.05, and x+y+z≤1.0. The synthesized monocrystalline NMC is useful as an active material for cathodes, such as cathodes for lithium ion and lithium metal batteries.

The application relates to a multi-component refractory metal carbide-Co composite powder and a preparation method of high-entropy ceramic composite material thereof, and belongs to the field of powder metallurgy. In the application, multi-component refractory metal oxides, cobalt oxides and carbon sources are mixed, vacuum carbothermal reduction is carried out at 1000-1300 DEG C, and a composite powder of uniformly dispersed refractory metal carbide and metal cobalt is generated in situ in one step. The reduction temperature is 200-500 DEG C lower than that of the same system without cobalt. The composite powder is formed, sintered in an Ar atmosphere at 1350-1500 DEG C and 2-10 MPa of air pressure, and a dense refractory metal carbide high-entropy ceramic-Co composite material is prepared. The sintering temperature is more than 400 DEG C lower than that required for sintering the corresponding carbide powder without cobalt. Through the introduction of cobalt, the preparation temperature is greatly reduced, the average grain size of the obtained composite material is less than 3 mu m, and the fracture toughness is more than one time higher than that of the same high-entropy ceramic material without Co. The application is suitable for high-performance cutting tools and wear-resistant parts, and has the advantages of energy saving and consumption reduction and high toughness.

This invention discloses a continuous and efficient method for preparing nano-sized cobalt hydroxyl oxide and cobalt tetroxide, and their applications. The method includes the following steps: (1) adding a cobalt salt solution, an oxidant, and a precipitant to a complexing agent and a solvent, and stirring to obtain a reactant; (2) drying the reactant at 150-160°C to obtain the cobalt hydroxyl oxide; and drying the reactant at 220-230°C to obtain the cobalt tetroxide. Compared with batch production methods, the continuous method of this invention has higher production efficiency, and the prepared cobalt hydroxyl oxide has advantages such as large specific surface area, easy crushing, and small particle size.

This application relates to the field of lithium battery technology, providing a lithium nickel manganese cobalt oxide material with high cycle stability, a method for preparing the material by warm isostatic pressing, and a solid-state battery. The preparation method includes the following steps: S100, encapsulating a metal-organic precursor in an independent container to obtain an encapsulated component; placing the encapsulated component and lithium nickel manganese cobalt oxide powder in a pressure-resistant cavity; S200, filling the pressure-resistant cavity with inert gas and performing warm isostatic pressing treatment, followed by cooling and depressurization to obtain the lithium nickel manganese cobalt oxide material. This application achieves high cycle stability by performing warm isostatic pressing treatment on the metal-organic precursor and lithium nickel manganese cobalt oxide powder under high temperature and high pressure, resulting in densification, microcrack healing, and lattice reconstruction of the lithium nickel manganese cobalt oxide bulk material; simultaneously, the in-situ surface coating of the lithium nickel manganese cobalt oxide particles is achieved by utilizing precursor decomposition, improving its interfacial chemical stability. The synergistic effect of these two methods results in high cycle stability.

The application discloses a kind of for SO2 preparation sulphur nanofiber catalyst and preparation method and application, the catalyst with the mixture of carbon nanospheres and carbon nanofiber hollow tube as template, with manganese oxide and cerium oxide as active component, cobalt oxide as cocatalyst.First, wood is carbonized into carbon nanofiber hollow tube, then carbon nanospheres are loaded on carbon nanofiber hollow tube to form a template, then the template is combined with the active component by hydrothermal method, and finally the catalyst is prepared by removing the template by high temperature calcination.The catalyst is suitable for the use scene of converting sulfur dioxide gas into sulfur, especially suitable for industrial flue gas sulfur dioxide resource, and the process flow is simple, the conversion efficiency is high, has higher economic value and broad market application prospect.

The application discloses a cobalt-phosphorus-cobalt oxide composite electrode material and application thereof as an anode of a direct borohydride fuel cell. First, a conductive substrate is placed in an aqueous solution containing a cobalt source, ammonium fluoride and urea to perform a hydrothermal reaction; after being reduced to room temperature, the conductive substrate is repeatedly cleaned with deionized water, and then is placed in a solution containing sodium hypophosphite to perform immersion; finally, the conductive substrate is calcined at high temperature in a vacuum environment to obtain the cobalt-phosphorus-cobalt oxide loaded on the conductive substrate in situ. The electrode material preparation method provided by the application converts the original contact between a carrier gas and an electrode surface in a phosphorization process into the in-situ adhesion of a phosphorus solution on the electrode surface, realizes a uniform phosphorization process, is low in cost and easy to be industrialized, and the material can be used as an anode material of the direct borohydride fuel cell.

This invention discloses a method for preparing a flame-retardant epoxy resin containing a recyclable flame retardant and its application. The method for preparing the flame retardant includes: preparing a manganese cobalt oxide flame retardant through the co-precipitation of manganese and cobalt ions followed by calcination. This invention synthesizes a manganese cobalt oxide flame retardant via a co-precipitation method and uses it as a filler in epoxy resin, curing it to obtain a green, halogen-free, environmentally friendly flame-retardant epoxy resin. It does not pollute the environment during pyrolysis or combustion and can effectively catalyze the conversion of harmful gases generated during combustion, which is beneficial to environmental protection and sustainable development. It has excellent flame-retardant properties, greatly reducing the release of heat, smoke, and harmful gases during epoxy resin combustion, significantly enhancing its fire safety. Furthermore, it enables efficient recovery of the flame retardant from the epoxy resin, with a recovery rate of up to 90.0%, achieving high-quality resource utilization.

The present application relates to a kind of methods for separating and recovering cobalt from crude cobalt hydroxide, the method comprises the following steps: first, crude cobalt hydroxide, cobalt-containing acid leaching solution, first sulfuric acid solution, oxidizing agent and fluorine-containing additive are mixed to carry out first leaching reaction, the first leaching system is cooled and crystallized, and solid-liquid separation is carried out to obtain cobalt-containing leaching residue;Second, the cobalt-containing leaching residue is dissolved and treated, and solid-liquid separation is carried out to obtain cobalt-rich solution and insoluble residue;Then, reducing agent, second sulfuric acid solution and the insoluble residue are mixed to carry out second leaching reaction, and solid-liquid separation is carried out to obtain cobalt-containing acid leaching solution and return;Efficient selective separation and recovery of cobalt resource in crude cobalt hydroxide is realized, so that the cobalt recovery rate is preferably as high as 99% or more, while the impurity removal rate is preferably as high as 95% or more, compared with traditional one-step reduction acid leaching process, the consumption of reducing agent, oxidizing agent and neutralizing agent is reduced, and the separation and recovery cost is reduced.

This invention discloses a method for selective leaching of crude cobalt hydroxide, comprising the following steps: S1, mixing crude cobalt hydroxide, ammonium leaching agent, and water, and adding an active additive to carry out an ammonium leaching reaction; after the reaction, performing solid-liquid separation to obtain a leachate and a leaching residue; S2, adding a sulfiding agent to the leachate to carry out a precipitation reaction; after the reaction, performing solid-liquid separation to obtain metal sulfides and demetallization wastewater; S3, mixing the leaching residue with water to form a slurry, then adding an acid leaching agent and a reducing agent to carry out an acid leaching reaction; after the reaction, performing solid-liquid separation to obtain a leachate rich in cobalt and manganese and a final residue; the method further includes a cyclic leaching step: using the demetallization wastewater as a regenerated ammonium leaching agent, reusing it for the ammonium leaching reaction in step S1; and repeating steps S1-S2 until the regenerated ammonium leaching agent reaches a predetermined number of regenerations. This invention achieves a total leaching rate of ≥99% for both cobalt and manganese through the selective complexation effect of the ammonium leaching agent.

Provided is a method for evaluating oxidation resistance of a sulfide solid electrolyte containing a lithium (Li) element and a sulfur (S) element. In the present invention, direct current resistance or alternating current impedance of a mixture of the sulfide solid electrolyte and an oxide of nickel, manganese, or cobalt is measured over time; and oxidation resistance of the sulfide solid electrolyte is evaluated on the basis of a change over time in said resistance or said impedance. The oxide of nickel preferably contains NiO2. The oxide of manganese preferably contains MnO2. The oxide of cobalt preferably contains CoO2.

The application provides a method for calculating the specific surface area of nanometer cobalt hydroxide, and belongs to the technical field of lithium ion battery material preparation, and solves the problem of difficult accurate adjustment of the specific surface area of nanometer cobalt hydroxide, wherein the application uses cobalt sulfate as raw material to prepare solution A and solution B; the prepared solution is subjected to nanometer cobalt hydroxide synthesis reaction; then the synthesized slurry is aged, washed, dried and airflow broken to obtain nanometer cobalt hydroxide product; the concentration of sodium hydroxide, the synthesis temperature range, the specific surface area of the prepared nanometer cobalt hydroxide, the negative linear relationship and the numerical relationship between the concentration of the sodium hydroxide solution, the synthesis temperature and the specific surface area of the nanometer cobalt hydroxide are set. By adjusting the concentration of the sodium hydroxide solution and the synthesis temperature during the wet synthesis of nanometer cobalt hydroxide, the specific surface area of the nanometer cobalt hydroxide can be accurately adjusted within a range, and the control precision reaches the theoretical requirement.

The application discloses a preparation method of mixed slurry of lithium manganese iron phosphate and high-nickel lithium nickel manganese cobalt oxide, and relates to the technical field of lithium ion batteries.The method comprises the following steps: long-molecular-chain polyvinylidene fluoride and short-molecular-chain polyvinylidene fluoride are dissolved by steps to prepare conductive glue liquid; the conductive glue liquid is divided into two parts in proportion; lithium manganese iron phosphate material and high-nickel lithium nickel manganese cobalt oxide material are dry-mixed to obtain dry-mixed mixture; the first part of the conductive glue liquid and a dispersing agent are added into the dry-mixed mixture; after mixing and dispersing, semi-finished product slurry is obtained; the second part of the conductive glue liquid is added into the semi-finished product slurry; after mixing and dispersing, finished product slurry is obtained.The application solves the problems of uneven dispersion of multi-phase particles, low efficiency of hetero-interface conductive network construction and the like in the traditional process, and the prepared mixed slurry has excellent storage stability and processing performance; while the amount of conductive agent is greatly reduced, the energy density and cycle life of the battery cell are improved.

The present invention discloses a method for preparing and using a heavily coated cobalt oxide. First, spherical cobalt hydroxide particles are synthesized by a co-precipitation method. Then, the spherical cobalt hydroxide particles are dried, dehydrated, and uniformly mixed with zirconium alkyl carboxylate / aluminum alkyl carboxylate and zirconium hydroxide / aluminum hydroxide. The mixture is then heated to react with the cobalt hydroxide on the particle surface, causing it to adhere closely to the surface of the spherical cobalt hydroxide particles. Finally, the particles are calcined to remove organic matter, resulting in spherical cobalt oxide particles with a strong coating on their surface.In the present invention, the coating layer and the base material are connected through chemical bonds, which makes the two adhere to each other more closely, so that the coating layer is not easy to spray off and peel off, greatly extending the service life of the coating layer, and improving the cycle performance of the material.

This invention discloses a transition metal hydroxyl oxide / cobalt oxide heterojunction electrocatalyst. The electrocatalyst is a heterojunction formed with an electron-rich cobalt oxide nanoarray as the core and a transition metal hydroxyl oxide as the shell. The heterojunction has a built-in electric field at the interface. By controlling the electronic state of the cobalt oxide, the direction and intensity of the built-in electric field at the interface can be precisely controlled to enhance the oxygen evolution reaction activity. By constructing a heterojunction using cobalt oxide and NiFeOOH, the direction and intensity of the built-in electric field at the interface can be precisely controlled by controlling the electronic state of cobalt ions in the cobalt oxide. This results in the heterojunction having the lowest reaction energy barrier, improving the performance of the anodic oxygen evolution reaction (OER) and water electrolysis, and maximizing the catalytic activity.

This application discloses a method for producing acetonitrile, comprising the following steps: in a reactor, contacting an acetate, ammonia, and a catalyst to react and obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; wherein the catalyst is composed of a support and a divalent transition metal oxide, an alkaline earth metal oxide, and an alkali metal oxide supported on the surface of the support; wherein the divalent transition metal oxide is selected from at least one of manganese oxide, ferrous oxide, cobalt oxide, nickel oxide, copper oxide, and zinc oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; and wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide.

A modified ternary cathode material, its preparation method, and a secondary battery are disclosed. The preparation method of the modified ternary cathode material includes: mixing the ternary cathode material and coating additives through sand milling to obtain a slurry; drying the slurry by spray drying; the coating additives include one or more of aluminum hydroxide, alumina, aluminum phosphate, titanium oxide, cobalt hydroxyl oxide, cobalt nitrate, and strontium carbonate to obtain a mixture; and sintering the mixture to obtain the modified ternary cathode material. This preparation method reduces the residual alkali content of the obtained modified ternary cathode material by improving the mixing process. The process is relatively simple, reduces the need for water washing, and helps save process costs. The modified ternary cathode material obtained by the above preparation method has a low residual alkali content and good cycle performance. When used in processing, such as manufacturing secondary batteries, the modified ternary cathode material can maintain good uniformity during the homogenization and coating processes, providing good electrochemical performance for the secondary battery.