134 results about "Cobalt salt" patented technology

The application relates to the technical field of organic synthesis, and discloses a preparation method of a hydrocarbyl carboxylic acid, which comprises the following steps: mixing a hydrocarbyl aldehyde, an oxidizing agent and a first metal salt to perform pre-reaction, and then mixing the reaction system obtained through the pre-reaction with a second metal salt to perform reaction; wherein the first metal salt is selected from at least one of a sodium salt, a potassium salt, a calcium salt, a lithium salt, an iron salt and a copper salt; and the second metal salt is selected from at least one of a zinc salt, a manganese salt, a cobalt salt, a palladium salt and a silver salt. The preparation method of the hydrocarbyl carboxylic acid can greatly shorten the reaction time, and improve the raw material conversion rate, the target product selectivity and the target product purity of the aldehyde oxidation acid reaction.

This invention discloses a method for preparing and applying a class of highly efficient catalytic materials for activating persulfate. The preparation method includes: dispersing g-C3N4 in nitric acid at room temperature, stirring, washing, and drying to obtain g-C3N4-H; placing it in an inert atmosphere and treating it at high temperature to obtain a g-C3N4 substrate; mixing it with iron salt, cobalt salt, water, and 1,10-phenanthroline to obtain a suspension; evaporating to dryness, grinding, drying, treating at high temperature, dispersing in nitric acid, washing, drying again, treating at high temperature in an inert atmosphere, and naturally cooling to obtain FeCo-g-C3N4 catalytic material. The method of this invention constructs structurally stable and highly dispersed FeCo bimetallic-nitrogen-carbon active centers on the g-C3N4 substrate; it can achieve efficient degradation of pollutants with low dosage, while the metal leaching rate is extremely low, avoiding secondary pollution; this catalytic material combines high activity, high stability, environmental friendliness, and operational economy, showing outstanding application potential in the field of advanced oxidation water treatment.

The present application relates to the technical field of rubber, in particular to a kind of giant engineering machinery tire anti-split body rubber composition and preparation method thereof. With 100 parts by weight of natural rubber component as benchmark, further comprising the following components: natural rubber 100 parts, carbon black 40-50 parts, zinc oxide 6-8 parts, cobalt salt 0.2-0.4 parts, antioxidant 2246 0.5-1 part, antioxidant S-TMQ 0.2-1.0 parts, N,N'-4,4'-diphenyl methane bismaleimide 0.5-1.5 parts, insoluble sulfur 8-12 parts, accelerator 0.3-0.7 parts, anti-scorching agent 0.05-0.15 parts. The present application solves the shortcomings of lower adhesive property of body rubber and insufficient anti-splitting ability of existing technology under harsh road conditions and hot and humid, steam, salt water environment, greatly reduces the occurrence probability of body delamination and bead bulging under hot and humid environment in Southeast Asia, improves the anti-splitting ability of body rubber, and ensures the service life of giant tire under high load operation.

The application belongs to the field of electrochemical catalyst and energy technology, and particularly relates to a catalyst for electrocatalytic C-N coupling, especially a S-doped Cu-Co catalyst for electrocatalytic C-N coupling, and further discloses a preparation method and application thereof. The S-doped Cu-Co catalyst utilizes copper salt and cobalt salt to form a Cu-Co material and serve as an active site of a reaction, and meanwhile, is synergistically regulated by S atoms. The S-doped Cu-Co catalyst has the advantages of structural stability, high electrolysis activity and long service life in the process of electrolytic catalysis of CO2, and is especially suitable for a process of preparing amides by electrocatalytic C-N coupling of carbon-containing small molecules and nitrogen-containing small molecules.

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.

The application discloses a kind of cobalt salt packing machine equipment predictive maintenance systems based on multi-parameter fusion, it is related to industrial equipment predictive maintenance technical field, including signal acquisition unit, for collecting first sensing signal and temperature sensing signal;Processing module, for: when first sensing signal exceeds threshold value, according to current first sensing signal generates prediction temperature sequence;Locate temperature change rate extreme point in prediction temperature sequence, and extract verification interval based on extreme point;Matching is carried out between the prediction temperature sequence in verification interval and actual acquisition temperature sequence;If matching degree exceeds pre-setting signal threshold value, then determine real degradation, and determine first remaining life based on the degradation characteristics of real degradation stage.The application realizes reliably to the remaining life of packing machine equipment and is predicted in time.

This invention provides a Pt single-atom / cluster co-supported NiCo layered bimetallic oxide material, its preparation method, and its application. The preparation method includes: adding cobalt salt and 2-methylimidazole to an anhydrous methanol solution and stirring at room temperature; after the reaction is complete, centrifuging to collect the product, repeatedly washing, and drying to obtain a zeolite-like imidazolium ester framework material, Co-ZIF; adding Co-ZIF, nickel salt, and platinum source to an anhydrous ethanol solution and stirring at room temperature; after the reaction is complete, centrifuging to collect the product, repeatedly washing, and drying to obtain a Pt-supported NiCo layered bimetallic hydroxide material; and calcining the Pt-supported NiCo layered bimetallic hydroxide material to obtain a Pt single-atom / cluster co-supported NiCo layered bimetallic oxide material. The material of this invention exhibits excellent catalytic activity, demonstrating superior activity and stability in the hydrogen evolution reaction in alkaline electrolytes.

This invention discloses an organocobalt salt for improving the tensile strength of rubber and its preparation method, belonging to the field of rubber technology. The organocobalt salt for improving the tensile strength of rubber comprises, by mass parts, 140-210 parts of organosilicon vegetable fatty acid, 20-30 parts of solvent, 20-30 parts of cobalt hydroxide, and 10-16 parts of propionic acid. The organosilicon vegetable fatty acid is obtained by reacting rosin with organosilicon maleimide. The organosilicon maleimide is obtained by reacting maleic anhydride with a silicon-containing long-chain fatty amine. The silicon-containing long-chain fatty amine is obtained by reacting methyldiethoxysilane with an unsaturated long-chain fatty amine. The organocobalt salt obtained by this invention has a good effect on promoting the adhesion between metal and rubber while effectively improving the tensile strength of rubber.

The application discloses a preparation method of multifunctional composite nanometer hollow spheres, which comprises the following steps: dissolving iron cyanide in water to form solution A; dissolving cobalt salt, silver salt and sodium citrate in water to form solution B; adding solution B into solution A and stirring for 10-30 min, and then aging for 24-48 h to obtain a precursor; and heat-treating the prepared precursor in a tubular furnace under N2 atmosphere at 600-900 DEG C for 2-5 h, and the heating rate is 1-3 DEG C / min, and then continuing phosphorization treatment for 1-5 h at 300-400 DEG C by taking sodium hypophosphite as a phosphorus source to obtain multifunctional composite nanometer hollow sphere catalysts. The preparation method is simple and easy to operate, the prepared composite catalyst is composed of multiple components, has multifunctionality, and shows excellent catalytic activity on electrocatalytic hydrogen evolution, oxygen evolution and oxygen reduction reaction in an alkaline medium, and shows a good application prospect in electrocatalytic water decomposition and zinc-air batteries.

The application belongs to the technical field of lithium-sulfur batteries, and relates to a separator catalyst material and a preparation method and application thereof. The preparation method of the separator catalyst material comprises the following steps: S1. mixing MXene, a copper salt, a cobalt salt, an additive and a first solvent, and performing a hydrothermal reaction to obtain MXene@ copper-cobalt bimetallic oxide; and S2. mixing the MXene@ copper-cobalt bimetallic oxide and Na2S in a second solvent and performing a hydrothermal reaction to obtain MXene-composite copper-cobalt bimetallic sulfide. The preparation method is relatively simple, and the prepared separator catalyst material can improve the problem of poor cycle performance caused by the serious shuttle effect of a lithium-sulfur battery.

This invention discloses a method for preparing and applying a Ni-doped Co3O4 catalyst. The invention employs a pressure co-precipitation method, comprising the following steps: co-current mixing of a cobalt salt solution, a nickel salt solution, and a precipitant solution. Using ultrapure water as a solvent and sodium carbonate as the precipitant solution, nickel nitrate hexahydrate and cobalt nitrate hexahydrate are mixed and calcined to synthesize a magnetic thermocatalytic material. Through nickel ion doping, the Co3+ in Co3O4 undergoes a transition from a low-spin to a high-spin state, enhancing the hybridization of the 3d-2p orbitals, promoting the breaking of O-O bonds, and significantly improving its efficiency in synergistically removing ozone and formaldehyde. This invention is expected to be widely applied in the thermocatalytic treatment of harmful gases.

This invention belongs to the field of catalyst technology and discloses a nitrogen-doped carbon-supported cobalt-nickel dual-site ORR-OER catalyst and its preparation method. The catalyst has the molecular formula CoNi-MOF@ACW and the structure is a dodecahedral CoNi-MOF grown on nitrogen-doped biomass carbon ACW with Co and Ni in an atomically dispersed state. Preparation method: (1) Prepare nitrogen-doped biomass carbon ACW; (2) Prepare a complex of metallic nickel and PI-PINi; (3) Dissolve water-soluble zinc salt, water-soluble cobalt salt and PINi together in methanol to obtain solution A; (4) Add 2-methylimidazole to methanol to obtain solution B; (5) Add ACW to solution A, stir evenly and then add solution B, continue stirring evenly; (6) Take out the solid material to obtain the precursor CoPINi-MOF@ACW; (8) Wash CoPINi-MOF@ACW with methanol and then dry; (9) Embed CoPINi-MOF@ACW with NH4Cl and pyrolyze to obtain the target catalyst. The catalyst of this invention has extremely high ORR-OER bifunctional catalytic activity and stability.

The application belongs to the technical field of pigments, and particularly discloses a preparation method of cobalt tin blue pigments, which comprises the following steps: S1, dissolving cobalt salt and tin salt in water to prepare a base solution, and then adding citric acid and stirring to obtain a complex metal salt solution; S2, dissolving ammonium bicarbonate in deionized water to obtain a precipitant solution; S3, under the condition of 40-60 DEG C and constant speed stirring, the precipitant solution obtained in step S2 is added dropwise into the complex metal salt solution obtained in step S1, so that the reaction is completed within 1-2 hours; after the dropwise addition is completed, the reaction system is heated to 80-95 DEG C, and is aged at the temperature for 2-4 hours to obtain a precursor precipitate; and S4, the precursor precipitate obtained in step S3 is filtered, washed and dried, and then calcined in an air atmosphere, and after the calcination, the furnace is cooled and the product is ground, so that the whole precipitation process is more gentle and uniform, the components of the final product are more uniform, the chroma is more accurate, and the purity is higher.

This invention discloses a modified cerium oxide, meltblown nonwoven fabric, its preparation method, and its application. The preparation method of modified cerium oxide includes the following steps: mixing an alcohol solution A containing cerium salt, copper salt, and cobalt salt, and an alcohol solution B containing hexamethylenetetramine; adding water; heating to carry out the reaction; and adding aminosilane to obtain modified cerium oxide. The molar ratio of cerium in the cerium salt, copper in the copper salt, and cobalt in the cobalt salt is Ce:Cu:Co = 1:(0.005-0.030):(0.10-0.30). By controlling the amount of cerium in the cerium salt, copper in the copper salt, and cobalt in the cobalt salt, this invention ensures that copper and cobalt are uniformly distributed in the modified cerium oxide, effectively promoting its antibacterial effect. Simultaneously, the use of aminosilane allows the modified cerium oxide to be uniformly dispersed in the polypropylene system, improving the compatibility between the modified cerium oxide and the polypropylene system, thereby enhancing the antibacterial effect of the meltblown nonwoven fabric prepared using modified cerium oxide.

The application discloses a kind of heterogeneous structure catalyst and preparation method and use.The preparation method includes the following steps: 1) molybdenum salt, cobalt salt, organic nitride, alcohol and water are mixed, to obtain precursor solution;Precursor solution and pretreated foam nickel are placed in hydrothermal reaction kettle and are reacted, to obtain first intermediate product;2) under inert atmosphere, first intermediate product is precalcined at 280~350 ℃ for 0.5~2 h, then heated to 620~680 ℃, and calcined at the temperature for 2~4 h, to obtain second intermediate product;3) cerium salt and aqueous solution of urea, second intermediate product are added to hydrothermal reaction kettle and are reacted, to obtain third intermediate product;4) under inert atmosphere, third intermediate product is annealed at 280~350 ℃ for 0.5~2 h, to obtain heterogeneous structure catalyst.The obtained heterogeneous structure catalyst can be used for alkaline overall water splitting to produce hydrogen, and has low OER Tafel slope, high faradic efficiency and low required voltage.

The application relates to the technical field of VOCs degradation, and discloses a preparation method of spinel / CeO2 / attapulgite ternary composite material and application of the spinel / CeO2 / attapulgite ternary composite material in VOC degradation. The method comprises the following steps: firstly, loading CeO2 on attapulgite by using a homogeneous precipitation method to obtain a CeO2 / ATP; then, manganese salt and cobalt salt are prepared into a solution, oxalic acid solution is added, the CeO2 / ATP composite is added, and a precursor is generated through water bath stirring reaction; and finally, a non-crystalline-crystalline spinel (Mn 1.5 Co 1.5 O4) ternary composite catalyst loaded on CeO2 / ATP is obtained through calcination. The electron transfer between CeO2 and the non-crystalline-crystalline Mn 1.5 Co 1.5 CoO4 at the interface can enhance the low-temperature catalytic oxidation performance of the catalyst. In addition, the dispersion and stability of the spinel particles on CeO2 can enhance the number of active sites, and the low-temperature degradation activity and high-temperature stability of the catalyst to VOCs such as toluene are improved.

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 invention relates to a method for preparing a cobalt-zirconium bimetallic composite catalyst, comprising: dissolving a soluble zirconium salt in deionized water; adjusting the pH by adding an alkaline precipitant dropwise while stirring to obtain a suspension A; subjecting suspension A to hydrothermal treatment, washing, and drying to obtain an amorphous powder; dispersing the amorphous powder in ultrapure water while stirring; adding a cobalt salt solution dropwise; adjusting the pH by adding an alkaline precipitant dropwise again; continuing stirring; filtering, washing, and drying to obtain a supported cobalt-zirconium bimetallic composite catalyst. This method is simple, energy-efficient, and can achieve uniform surface loading. This invention also relates to the composite catalyst prepared using this method and its applications. This invention can achieve efficient degradation of organophosphorus pollutants and simultaneous removal of their mineralization product, phosphate, effectively solving the technical problem that residual phosphate after organophosphorus degradation easily leads to eutrophication of water bodies in traditional technologies.

This invention discloses a polyphosphazene / MXene self-supporting electrode loaded with cobalt single atoms, its preparation method, and its application, belonging to the field of seawater uranium extraction technology. Ti3AlC2 powder is etched in an HCl-LiF mixed solution and then ultrasonically exfoliated to obtain Ti3C2T. x Nanosheet suspension; simultaneously, hexachlorocyclotriphosphazene, 4,4'-dihydroxydiphenyl sulfone, and cobalt salt were dissolved in a solvent, and triethylamine was added. A condensation reaction was then carried out under ultrasonication to obtain Co-PZS; then Ti3C2T x After the nanosheet suspension is uniformly mixed with Co-PZS and carbon fiber fabric, it is transferred to a hydrothermal reactor for hydrothermal reaction. The resulting hydrothermal reaction product is then dried and calcined to obtain a polyphosphazene / MXene self-supporting electrode loaded with cobalt single atoms. This electrode is used for the electrochemical adsorption of uranyl ions in the solution system and exhibits excellent comprehensive uranium extraction performance, with advantages such as high capacity, fast rate, strong selectivity, and good stability, meeting the application requirements of seawater uranium extraction.

The present application relates to the technical field of separation materials, and relates to in-situ preparation of a transition metal doped MOR zeolite molecular sieve adsorbent and application of the adsorbent in separation of nitrogen / methane, wherein sodium hydroxide and sodium metaaluminate are added into water, stirred to completely dissolve, and a solution A is obtained; anhydrous oxalic acid and a cobalt salt, a nickel salt, a copper salt or a zinc salt are added into water, stirred to obtain a solution B; the solution B is added into the solution A, stirred to obtain a mixed solution; then, silicon sol is added dropwise under stirring at room temperature, and after stirring for a certain time at room temperature, the mixed solution is transferred to a reaction kettle, and a crystallization reaction is carried out in a homogeneous phase reactor; after a certain time, the reaction kettle is taken out, cooled to room temperature, centrifuged, washed and dried, and then high-temperature calcination is carried out, so as to obtain the transition metal doped MOR zeolite molecular sieve adsorbent. The metal components introduced in the present application precisely control the pore of the adsorbent, and solve the problem that the adsorption capacity and selectivity of the zeolite molecular sieve are difficult to be considered simultaneously.

This invention discloses a two-step pulse electrodeposition method for preparing a nickel-tungsten-cobalt ternary metal oxygen evolution electrode and its application. Specifically, it addresses the Ni... 2+ Co 2+ With W 6+ The large differences in reduction potential and the mismatch in reduction kinetics lead to elemental segregation in single-step deposition. This invention addresses this problem by employing a two-step pulsed electrodeposition strategy: first depositing a Ni-W metal layer, then depositing a Ni-Co metal layer. This strategy optimizes the plating bath composition and pulse parameters step-by-step to accommodate the reduction requirements of different metal ions. The method includes: pretreatment of the nickel-based substrate; performing a first-step pulsed electrodeposition in a solution containing nickel and tungsten salts; and then performing a second-step pulsed electrodeposition in a solution containing nickel and cobalt salts, followed by drying. This invention, through specific two-step deposition and the periodic regulation of the pulsed current, effectively optimizes the loading and dispersion of nickel, tungsten, and cobalt, resulting in a high-performance oxygen evolution electrode with stable and reliable performance, meeting the application requirements of large-scale industrial production.

This application provides a rubber composition for predicting the reversion resistance of natural rubber and a test method for predicting the reversion resistance of natural rubber. By weight, the rubber composition for predicting the reversion resistance of natural rubber comprises: 100 parts natural rubber, 40-80 parts carbon black, 1-10 parts zinc oxide, 0.5-3 parts cobalt salt, 1-3.5 parts adhesive resin, 1-5 parts adhesive, 3-6 parts vulcanizing agent, and 0.5-2 parts vulcanization accelerator; the rubber composition does not contain stearic acid. Through the specific ratio and synergistic effect of the above components, a detection formulation system with demasking and high response sensitivity is constructed. This formulation does not require the use of acetone or additional equipment; its vulcanization characteristics can be tested using a conventional vulcanizer, which can efficiently and accurately predict the reversion resistance of natural rubber, effectively solving the problem that existing detection methods are difficult to quickly and accurately assess the reversion resistance of natural rubber.

The application discloses a Ce-doped Co-MOF derived CuO composite oxide catalyst and a preparation method thereof, and belongs to the technical field of catalytic materials. The preparation method comprises the following steps: S1, obtaining rare earth waste residue containing Ce elements and Co elements, and processing the rare earth waste residue to obtain a cerium salt solution and a cobalt salt solution; S2, mixing the cerium salt solution and the cobalt salt solution with an organic ligand to prepare a Ce-Co-MOF precursor; S3, performing calcination and annealing treatment to obtain a Ce-Co-O porous composite oxide carrier; S4, preparing a copper salt solution, impregnating the Ce-Co-O porous composite oxide carrier with the copper salt solution, and then performing drying and calcination treatment to obtain a CuO@Ce-Co-O composite oxide; and S5, performing surface plasmon activation treatment to obtain the Ce-doped Co-MOF derived CuO composite oxide catalyst. The application can realize high-value utilization of rare earth resources and precise structure regulation of catalytic materials, and the prepared catalyst can exhibit excellent activity and stability in a low-temperature CO oxidation reaction.

This application discloses a method for preparing a high-entropy Prussian blue analogue composite flexible electrode material and a sodium-ion hybrid capacitor. First, disodium hydrogen phosphate, p-toluenesulfonic acid monohydrate, and pyrrole are dissolved in deionized water. Constant current electrochemical polymerization is then performed using carbon cloth as the working electrode to grow polypyrrole nanofibers in situ on its surface. Subsequently, high-temperature carbonization is carried out under an argon atmosphere to obtain a nitrogen-doped carbon nanofiber / carbon cloth substrate. Then, manganese salt, cobalt salt, nickel salt, copper salt, and iron salt are mixed with sodium citrate to prepare a mixed solution, which is then reacted with potassium ferricyanide solution. After aging, washing, and drying, a high-entropy Prussian blue analogue-loaded composite cathode material is obtained. This application constructs a hierarchical composite structure integrating flexible support, rapid conductivity, and efficient sodium storage, which can effectively shorten the ion diffusion path, improve the electron transport rate, and alleviate structural distortion during charging and discharging.

This invention proposes a boron-phosphorus co-doped multi-element alloy catalyst supported on a metal oxide substrate, its preparation method, and its application. It belongs to the technical field of sodium borohydride hydrolysis hydrogen production materials. The method involves loading cobalt salts (such as cobalt chloride or cobalt nitrate), iron salts (such as ferric chloride or ferric nitrate), and hypophosphite (such as sodium hypophosphite) onto a support (such as γ-alumina or titanium dioxide) using an initial wet impregnation method. Sodium borohydride solution is added for chemical reduction, and boron is added for doping. After washing the reduction product, the catalyst is dried to obtain the supported boron-phosphorus co-doped multi-element alloy catalyst. When used as a sodium borohydride hydrolysis hydrogen production catalyst, it provides a maximum hydrogen production rate of 12729.78 mL·g under optimal conditions. cat ‑1 ·min ‑1 It produces 100% of the theoretical hydrogen yield and features good catalytic performance, simple preparation method, abundant raw materials, and low cost.

The application provides a cobalt acetate crystal preparation method based on waste cobalt residue and the cobalt acetate crystal. The preparation method comprises the following steps: S1, hydrogen reduction is performed on the waste cobalt residue to obtain a reduction product; S2, the reduction product is added into an inorganic acid solution, and a cobalt salt product is obtained through first stirring; S3, the cobalt salt product is added into an inorganic alkali solution, and a precipitation product and a residual liquid are obtained through second stirring; S4, the precipitation product is mixed with acetic acid, and the cobalt acetate crystal is obtained after reaction; the waste cobalt residue is a cobalt-containing waste catalyst generated in the oxidation reaction of trimethylphenol to trimethylbenzoquinone by using a supported cobalt catalyst. Through the design and optimization of the reduction, dissolution, precipitation and reaction steps of the waste cobalt residue, the waste cobalt residue is effectively utilized, the recycling of resources is realized, the cobalt acetate crystal prepared has high purity, low impurity content and good application performance.

This invention relates to the field of electrocatalyst technology, and in particular to a chiral CoFe-based oxygen evolution electrocatalyst, its preparation method, and its application. Iron salts, cobalt salts, and chiral tartaric acid are dissolved together in N,N-dimethylformamide solvent to form a homogeneous mixed solution. Hydrazine hydrate is added to the mixed solution and thoroughly mixed. The solution is then transferred to a high-pressure reactor and subjected to a solvothermal reaction at a set temperature to obtain a nanocatalyst precursor. The nanocatalyst precursor is then subjected to centrifugation, washing, drying, and vacuum calcination to obtain the product. This method successfully prepares a chiral CoFe-based nanocatalyst through the inductive effect of chiral tartaric acid, combined with a specific solvothermal reaction and subsequent heat treatment process. This chiral CoFe-based electrocatalyst exhibits significantly enhanced catalytic activity and stability in the oxygen evolution electrocatalytic reaction, demonstrating superior electrochemical performance compared to achiral catalysts.

This invention relates to a Co-Ni bimetallic nitroglycerin-based zinc-ion battery cathode material and its preparation method. The general chemical formula of the cathode material is Na. X Ni y Co z [Fe(CN)₅NO], where 0.5 ≤ x ≤ 1.5, 0.1 ≤ y ≤ 0.9, 0.1 ≤ z ≤ 0.9, and y+z=0.8~1.2. The preparation method includes: dissolving cobalt salt and nickel salt in deionized water in a specific ratio to prepare a bimetallic mixed solution A; dissolving sodium nitroprusside in deionized water to prepare a sodium nitroprusside solution B; adding solution A dropwise to solution B under stirring to co-precipitate, obtaining a suspension; aging the suspension at 0~25℃ in the dark for 0.5~10 days; finally, washing and drying the precipitate to obtain the cathode material. This invention utilizes the synergistic effect of bimetals to increase the framework stability of nitroprusside, suppress structural collapse and metal ion dissolution during charging and discharging, and provide abundant redox reaction sites, providing a cathode material for aqueous zinc-ion batteries. This method is simple, mild, and low-cost, suitable for industrial production.

This invention belongs to the field of methane combustion catalyst technology, specifically relating to a cobalt-aluminum composite material, its preparation method, and its application. The cobalt-aluminum composite material is a composite oxide of cobalt and aluminum, wherein the molar ratio of cobalt to aluminum is 1–11:1. This invention uses a wet grinding method with ethanol to mix and grind cobalt salt and aluminum salt precursors, followed by drying and calcination to obtain the composite material. This preparation method is green and simple. The resulting composite material exhibits high activity for the catalytic combustion of low-concentration methane (volume concentration ≤1%), particularly excellent sulfur resistance; its activity decreases slowly and can partially recover in a sulfur dioxide atmosphere, making it suitable for the catalytic purification of methane in industrial waste gas.

The application discloses a zeolite imidazolate framework / polyimide nanofiber composite membrane material based on cobalt metal defects and a preparation method and application thereof, constructs a nanofiber membrane with polyimide as a base, secondly, adopts an in-situ synthesis method of first impregnating a cobalt salt and then introducing a ligand, makes ZIF-67 nucleate and grow on the surface of the PI fiber, forms a firm anchoring structure, prevents particle agglomeration and ensures uniform distribution of active sites, finally, introduces controllable metal defects by immersing in a second metal salt solution, breaks the crystal symmetry to increase unsaturated coordination sites, significantly enhances the electrostatic adsorption and chemical capture capacity on fine particulate matters, simultaneously optimizes the pore structure, strengthens the interception effect under the premise of not increasing the pressure drop, and realizes the high-efficiency-low-resistance balance. The composite structure has high removal rate, low pressure drop and excellent flexibility.