105 results about "Cobalt acetate" patented technology

This invention belongs to the field of lithium-ion battery technology, specifically relating to a method for constructing Si@COF-Co materials using porphyrin COF as a conductive nano-protective layer for nano-silicon and its application. The invention first adds a methanol solution of PEI to a methanol solution of nano-silicon, then dries it at high temperature to obtain PEI-modified nano-silicon Si-PEI. Next, Si-PEI and PVP are dispersed in o-dichlorobenzene / n-butanol, and then COF monomer and glacial acetic acid are added. After maintaining the mixture at 110-130℃ for 70-80 hours, it is washed, dried, and ground to obtain Si@COF. Finally, Si@COF and cobalt acetate tetrahydrate are dispersed in methanol, reacted at room temperature, and then washed, dried, and ground to obtain Si@COF-Co. This invention offers a simple, high-yield, and effective method. The synthesized material effectively alleviates the volume expansion of nano-silicon, improves the stability and reversibility of the electrode material, and can be used as a negative electrode material for lithium-ion batteries.

The preparation method comprises the following steps: mixing cobalt acetate, a modified ligand, a modified additive and DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding deionized water and a modified filler, carrying out ultrasonic treatment, carrying out heating reaction, carrying out centrifugation to remove a supernatant, and carrying out drying treatment to prepare the rapid-charge high-capacity artificial graphite negative electrode material, when the cobalt acetate, the modified ligand, the modified additive and the modified filler are subjected to blending reaction, carboxyl on the modified ligand and carboxyl on the modified additive can form coordinate bonds with cobalt ions of the cobalt acetate, then a cobalt metal organic framework is formed on the surface of the modified filler, and a fluorine element in the modified ligand can react with lithium to form lithium fluoride; electron penetration is effectively blocked, and side reactions are reduced; the lithium ion diffusion energy barrier is reduced, rapid charging and discharging are achieved, pyridine groups on the surface of the modified filler can provide lone pair electrons and serve as binding sites of lithium ions, pseudocapacitance is formed, and then the capacity is increased.

The invention discloses a cobalt-based catalytic material for efficiently activating persulfate to degrade antibiotics and a preparation method of the cobalt-based catalytic material. The catalytic material is prepared by taking an H-Beta zeolite molecular sieve as a carrier, loading cobalt ions on the molecular sieve through an impregnation method and then carrying out high-temperature roasting treatment. The preparation method comprises the following steps: preparing a cobalt acetate tetrahydrate solution, adding an H-Beta zeolite molecular sieve into the solution to carry out ion exchange, and then carrying out drying and high-temperature roasting. The prepared catalytic material has highly dispersed cobalt active sites and excellent structural stability and catalytic activity. Compared with the prior art, the catalyst provided by the invention has the advantages of simple preparation process, lower cost, high catalytic efficiency, good stability, low cobalt ion dissolution rate, easiness in recovery and reuse and the like, and has a good practical application prospect.

The invention discloses a simple high-throughput preparation method of spinel type nano high-entropy oxide, which comprises the following steps: 1) dissolving ferric nitrate, cobalt acetate, nickel acetate and at least two other different metal salts in a solvent to form a feed liquid A; 2) dissolving a precipitant in the same solvent as the solvent in the step 1) to form feed liquid B; 3) starting the supergravity reactor; 4) simultaneously introducing the feed liquid A and the feed liquid B into a supergravity reactor through a peristaltic pump to carry out a coprecipitation reaction, and obtaining a high-entropy oxide precursor solution after the reaction; 5) centrifuging and washing the high-entropy oxide precursor solution, and dispersing the high-entropy oxide precursor solution in water to obtain a clean precursor solution; 6) introducing the clean precursor solution into a hydrothermal kettle for hydrothermal reaction, and obtaining a nano high-entropy oxide solution after the reaction; and 7) carrying out alcohol washing on the nano high-entropy oxide solution, and drying to obtain the nano high-entropy oxide. The prepared oxide is high in quality, the particle size is 10-100 nm, and the oxide still has good dispersity under the condition that a modifier is not added.

The invention discloses a preparation method of a metal organic framework catalyst and application of the metal organic framework catalyst in biomass furfural hydrogenation, and belongs to the technical field of catalytic hydrogenation. The preparation method of the metal organic framework catalyst comprises the following steps: S1, dissolving cobaltous acetate, L-glutamic acid and phosphomolybdic acid in distilled water to obtain a solution marked as a solution A; dissolving 1, 3, 5-benzenetricarboxylic acid (BTC) in ethanol to obtain a solution B, pouring the solution B into the solution A, stirring, and centrifuging to collect a precipitate; and S2, calcining the precipitate in an inert atmosphere to obtain the metal organic framework catalyst. The specific steps of applying the catalyst to the furfural hydrogenation reaction are as follows: adding the prepared catalyst and furfural into deionized water, performing heating and pressurizing reaction through a hydrogenation reaction kettle to obtain a solution, extracting the solution with ethyl acetate, and performing GC quantitative detection on the product after the extraction reaction. The method is mild in reaction condition, has an efficient furfural hydrogenation effect, and can completely convert FFA within 2 hours under the condition that 50 mg of catalyst is added.

The application provides a method for improving the yield of oxygen-containing compounds in low-rank coal-derived soluble matters, and belongs to the technical field of low-rank coal pretreatment, and comprises the following steps: first, performing ozone oxidation pretreatment on low-rank coal to obtain modified low-rank coal; using cobalt acetate, copper acetate and iron acetylacetonate as a cobalt source, a copper source and an iron source respectively, using hydrazine hydrate as a strong reducing agent, and using a one-pot hydrothermal method to obtain magnetic Co-CuFe2O4 nanospheres; and using the prepared Co-CuFe2O4 nanosphere catalyst to perform catalytic ethanolysis reaction on the low-rank coal subjected to ozone oxidation pretreatment. In the application, appropriate ozone oxidation pretreatment can effectively improve the activity of the low-rank coal, and when the magnetic Co-CuFe2O4 nanospheres are applied to catalytic ethanolysis reaction of the low-rank coal subjected to ozone oxidation pretreatment and catalytic ethanolysis reaction of low-rank coal-related model compounds, the magnetic Co-CuFe2O4 nanospheres all exhibit excellent catalytic activity, higher-yield soluble components can be obtained, the yield of oxygen-containing compounds in the derived soluble matters is improved, and efficient and high-value utilization of the low-rank coal is realized.

This invention discloses a method for coupling physicochemical treatment and biodegradation of plastics. The method includes the following steps: S1. Mixing plastics, organic solvents, and a metal catalyst, and reacting to degrade them to obtain organic products. The metal catalyst is cobalt acetate and / or manganese acetate; S2. Biodegrading the organic products from step S1 using a mixed colony, which includes *Pseudomonas*, *Bacillus*, *Flavobacterium*, and *Rhodococcus*. This invention uses cobalt acetate and / or manganese acetate as metal catalysts. The catalytic oxidation of the metal catalyst can efficiently depolymerize traditional plastics, overcoming the bottleneck of C-C bond breaking that is difficult for microorganisms to achieve. It can successfully convert plastics into organic products mainly composed of dicarboxylic acids, benzoic acid, and terephthalic acid, and the mixed colony process completely mineralizes the organic products. This method achieves complete removal of plastics without producing any toxic or harmful substances.

The invention discloses a peach ketone synthesis method, which relates to the technical field of essence and perfume synthesis, and comprises the following steps: adding cyclopentanone and glacial acetic acid into a reaction container, starting stirring, adding manganese acetate (II) and cobalt acetate (II), and then adding acetic anhydride; introducing dried air below the liquid level, heating to 80-100 DEG C, dropwise adding D-limonene, and carrying out a heat preservation reaction after dropwise adding is finished; gC monitors the reaction endpoint, and the reaction is stopped when the product purity of the reaction liquid is not increased any more; after the reaction is finished, filtering, carrying out reduced pressure distillation to recover cyclopentanone, glacial acetic acid and unreacted D-limonene, after the recovery is finished, adding methanol and n-heptane into kettle liquid, carrying out water extraction, washing and liquid separation, washing an organic phase with a sodium bicarbonate aqueous solution, carrying out reduced pressure distillation on the organic phase to recover n-heptane, and after the recovery is finished, obtaining a peach ketone crude product; and carrying out crude drawing and rectification on the peach ketone crude product to obtain a peach ketone finished product. The method has the advantages of mild reaction conditions, low safety risk and few three wastes, and can obtain a high-purity peach ketone finished product.

The invention belongs to the field of metal-organic framework (MOF) material synthesis, and discloses a method for preparing a UTSA-16 material through two-step ball milling and a product. The method comprises the following steps: putting citric acid and potassium hydroxide into a ball mill for ball milling; adding metal acetate into the ball mill, mixing the metal acetate with the obtained product, carrying out ball milling again, and then washing and drying the obtained product to obtain a UTSA-16 material; the metal acetate is zinc acetate or a combination of zinc acetate and one of cobalt acetate, magnesium acetate and copper acetate. According to the efficient and green method for preparing the high-quality UTSA-16 material, citric acid and potassium hydroxide are subjected to ball milling to prepare potassium citrate, then mechanical energy generated by ball milling is utilized again to promote the potassium citrate and metal acetate to be subjected to a coordination reaction, the ion concentration in the raw materials in the reaction process is higher, and the yield is higher. The method has the advantages of high synthesis efficiency, high yield and the like, and the preparation process has the advantages of mild reaction conditions, low energy consumption, greenness, high efficiency and the like.

The application provides an electrochemical synthesis method of glycine, improves catalytic activity of nitrate reduction and C-N coupling process through atom-dispersed Co-N active sites, and improves mass transfer efficiency through ordered mesoporous structure, thereby relieving the problem of limited substrate diffusion in the reaction process, so that higher glycine Faraday efficiency and yield can be obtained; through taking cobalt acetate tetrahydrate, 1,10-phenanthroline and magnesium hydroxide as raw materials, and sequentially performing reflux coordination, high-temperature pyrolysis and acid washing template treatment, uniform anchoring and atomic-level dispersion of cobalt species in the carbon skeleton can be realized, agglomeration of cobalt particles in the heat treatment process is avoided, and therefore the utilization rate and catalytic activity of cobalt active sites are significantly improved. Meanwhile, the magnesium hydroxide as a template material is removed in the subsequent acid washing process, and rich mesoporous structure can be formed in the catalyst, which is beneficial to rapid diffusion and mass transfer of reactants, intermediates and products, and diffusion limitation in the reaction process is relieved.

This invention discloses a ZIF-derived cobalt-based microwave absorbing and thermally conductive composite material and its preparation method, belonging to the field of microwave absorbing and thermally conductive composite material preparation. The invention first synthesizes a B / P in-situ doped ZIF-7 precursor at room temperature, then encapsulates it with tannic acid, and then reacts it in a methanol solution of cobalt acetate tetrahydrate to obtain a ZIF precursor. The obtained ZIF precursor is then calcined at high temperature to obtain a ZIF derivative with a cobalt single atom, cobalt nanoparticles, and a B / P-N co-doped porous carbon structure. This derivative is uniformly dispersed in an aqueous polyurethane matrix and polymerized to obtain a flexible microwave absorbing and thermally conductive composite material. The material obtained by this invention possesses both efficient electromagnetic wave absorption and thermal conductivity, and can be used to prepare integrated electromagnetic compatibility and thermal management structures for integrated circuit chips, thus showing good application prospects and significant economic benefits.

The invention relates to a preparation method and application of a biphase nanorod catalyst, and belongs to the field of hydrogen storage material catalysts.The preparation method comprises the following steps that ferric trichloride hexahydrate, cobaltous acetate tetrahydrate, nickel acetate tetrahydrate, sodium molybdate, ammonium metavanadate and terephthalic acid are weighed according to the molar ratio of 6: 6: 6: 6: 6: (1-2), and a mixture is obtained; adding the mixture into deionized water, stirring to obtain a homogeneous solution, carrying out hydrothermal reaction to form rod-like crystals, and finally obtaining light yellow precursor powder; the FeCoNiMoV-O / C biphase nanorod catalyst is obtained through reasonable proportioning, grinding, calcining and cooling of different raw materials, the FeCoNiMoV-O / C biphase nanorod catalyst has excellent catalytic performance, and the hydrogen absorption and desorption kinetics of MgH2 is remarkably improved.

The invention discloses a preparation method and application of a Co3O4 material with a porous nanosheet structure, and relates to a preparation method and application field of a Co3O4 material. The invention aims to solve the problems of high working temperature and high energy consumption of the existing Co3O4 serving as a triethylamine gas sensitive material. The method comprises the following steps: 1, adding cobalt acetate tetrahydrate into distilled water, stirring and dissolving; 2, adding ammonia water; 3, heating in a water bath; and 4, sintering. According to the application, the material is used for preparing a triethylamine gas sensor. The invention relates to preparation and application of a Co3O4 material with a porous nanosheet structure.

The invention belongs to the technical field of sewage treatment, and provides a bimetallic Bio-MOF material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing adenine and N, N-dimethylformamide to obtain an adenine solution; mixing cobalt acetate, ferric trichloride hexahydrate and N, N-dimethylformamide to obtain a metal ion solution; and mixing the adenine solution and the metal ion solution for solvothermal reaction. The bimetal Bio-MOF material disclosed by the invention is high in porosity and rich in active sites, and Fe and Co form effective coordination with an organic ligand, so that the process of activating peroxymonosulfate is accelerated, and degradation of tetracycline antibiotics and adsorption of PO4 < 3-> are accelerated; inorganic ions such as antibiotics and PO4 < 3-> in the sewage can be synchronously removed; the leaching amount of metal ions is still lower than the standard concentration after repeated use for five times, and the capacity of adsorbing PO4 < 3-> and degrading tetracycline antibiotics is relatively good.

The invention discloses a knittable magnetic fiber material with an angle sensitive characteristic as well as a preparation method and application of the knittable magnetic fiber material. Cobalt acetate and nickel acetate are used as raw materials, under the alkaline condition, the magnetic fiber material of a CoNi single face-centered cubic crystal structure is prepared through solvothermal reaction under directional induction of a magnetic field, and the magnetic fiber material is in a long fiber shape with the smooth surface and has high orientation, angle sensitivity and weaving performance. According to the invention, the height orientation and the high length-diameter ratio of the magnetic fiber are realized through the oriented induction growth of the magnetic field, the magnetic anisotropy is obviously improved, and the material is endowed with angle-sensitive electromagnetic response. The shape of the magnetic fiber material is suitable for a weaving process, a fabric with functionality and certain flexibility can be prepared by combining conductive warp and weft materials, a woven body formed by weaving shows angle-dependent electromagnetic shielding and microwave thermal response performance, and the magnetic fiber material is suitable for the field of controllable electromagnetic protection and intelligent thermal management. And a new technical approach is provided for the development of flexible magnetic functional materials.

The invention relates to a preparation method and application of a porous cuprous oxide-titanium dioxide composite material, cobalt acetate, sodium citrate and potassium ferricyanide are respectively dissolved in water according to a certain proportion, an aging reaction is carried out at a certain temperature, and ferrocobalt Prussian blue complex nanoparticles are obtained; the preparation method comprises the following steps: dissolving and dispersing copper nitrate, formic acid, ammonia water, hexadecyl trimethyl ammonium bromide and titanium dioxide in a mixed solvent of ethanol and water according to a certain ratio; the porous cuprous oxide-titanium dioxide composite photocatalytic material is prepared by adding a methanol solution with cobalt iron Prussian blue complex nanoparticles into a mixed solvent and preparing the porous cuprous oxide-titanium dioxide composite photocatalytic material through a one-step solvothermal method, and the porous cuprous oxide-titanium dioxide composite photocatalytic material comprises cuprous oxide particles with porous structures, titanium dioxide nano-particles are uniformly distributed on the surfaces and in the cuprous oxide particles. The preparation method has the advantage that as a catalyst, the photocatalyst has more excellent performance of photocatalytic degradation of TCH and formaldehyde.

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

The application discloses a high-efficiency stable Lewis acid-containing heterogeneous catalyst and a preparation method and application thereof, and belongs to the technical field of cycloaddition reaction catalysts.The heterogeneous catalyst has strong nucleophilic groups and strong electrophilic groups.The Lewis acid-containing raw material is selected from one of zinc acetate, cobalt acetate, copper acetate, ferrous acetate, magnesium acetate, nickel acetate, calcium acetate, manganese acetate, lead acetate and tin acetate.The prepared Lewis acid-containing heterogeneous catalyst is applied to catalyzing the cycloaddition reaction of an epoxide and CO2, and the cycloaddition reaction of ethylene oxide (EO) / propylene oxide (PO) and CO2 is preferentially adopted.The problems of difficult separation of a homogeneous catalyst and insufficient activity of a heterogeneous catalyst are preferably solved.

The invention discloses a preparation method of a bionic enzyme catalytic material, and belongs to the technical field of bionic enzyme catalytic materials. Comprising the following components in parts by mass: 100 parts of a phenolic resin precursor, wherein phenolic resin is resin obtained by condensing catechol and formaldehyde; 5-12 parts of a metal salt solution, wherein the metal salt is one or more of ferric nitrate, cobalt acetate and copper nitrate; 3-7 parts of an amino acid derivative regulating agent, wherein the regulating agent is lysine, histidine or a salt thereof; 1 to 5 parts of an auxiliary confinement template, wherein the template is a ZIF-8 or ZIF-67 nanocrystal; 1-3 parts of a surface functionalization modifier which is an artificial bionic peptide containing alkynyl at the tail end; according to the preparation method, a uniformly dispersed metal-phenolic aldehyde precursor is constructed through complexation reaction of phenolic resin and metal salt in ethanol, so that the problems of metal agglomeration and random distribution of active sites in a traditional impregnation method are avoided, and the catalytic activity and the site utilization rate are effectively improved.

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.

A process for the preparation of a 2,5-tetrahydrofurandimethanol difatty acid ester, comprising the following steps: providing a reaction system containing 2,5-tetrahydrofurandimethanol with a monobasic acid, wherein the structural formula of the monobasic acid is R-COOH, where R is an alkyl group from C5 to C20; esterification in the presence of a catalyst to obtain the 2,5-tetrahydrofurandimethanol difatty acid ester, wherein the catalyst is at least one of calcium acetate, tetraalkoxytitanium, manganese acetate, cobalt acetate, aluminum oxide, zinc oxide, and zinc-aluminum spinel; wherein the 2,5-tetrahydrofurandimethanol difatty acid ester has a structural formula as shown in Formula I, characterized in that the calcium acetate, tetraalkoxytitanium, manganese acetate, cobalt acetate, aluminum oxide, zinc oxide, and zinc-aluminum spinel have a particle size of have less than or equal to 80 mesh, and the reaction system includes a solvent,wherein the solvent is at least one of dimethyl sulfoxide and dimethylformamide.

The invention relates to the technical field of catalysts, in particular to a preparation method of an oxygen functionalized cobalt-nitrogen-carbon catalyst and application of the oxygen functionalized cobalt-nitrogen-carbon catalyst in electrosynthesis of hydrogen peroxide, and the preparation method comprises the following preparation steps: S1, dissolving melamine and glucose in deionized water, adding cobalt acetate and a precursor modifier, and stirring to obtain a uniform mixed solution; s2, heating and stirring the mixed solution until moisture is evaporated, drying, adding into a tubular furnace, heating from room temperature to 850-900 DEG C, keeping the temperature for 1-2 hours, and grinding into powder, so as to obtain a modified precursor material; and S3, adding the oxygen-functionalized modified liquid into the modified precursor material, stirring after ultrasonic dispersion, carrying out centrifugal separation, washing to be neutral, and drying to obtain the oxygen-functionalized cobalt-nitrogen-carbon catalyst. Through the synergistic effect of the precursor modifier and the oxygen functionalization modification liquid, the electrocatalytic oxygen reduction reaction activity and the hydrogen peroxide selectivity are improved, and excellent electrochemical stability and structural durability are shown while the high activity is kept.

The invention discloses a photo-thermal coupling methane dual-reforming catalyst as well as a preparation method and application thereof. The catalyst comprises a CeO2 nano flower ball carrier, NiCo alloy and La2O3, wherein the NiCo alloy and the La2O3 are loaded on the CeO2 nano flower ball carrier; the mass percentage of Ni is 5-15 wt%, the mass percentage of Co is 1-7 wt%, and the mass percentage of La2O3 is 5-15%. The preparation method comprises the following steps: forming a first solution; gradually adding an ammonia solution, adjusting the pH value, and continuously violently stirring; carrying out hydrothermal reaction; centrifuging and washing to obtain a precipitate, and drying and grinding the precipitate to prepare a CeO2 nano flower ball carrier; adding nickel acetate tetrahydrate, cobalt acetate tetrahydrate, lanthanum acetate tetrahydrate and the CeO2 nano flower ball carrier into deionized water, and carrying out ultrasonic dispersion to obtain a mixed solution; and drying, calcining and reducing. The catalyst obtained by the invention enhances the adsorption and activation capabilities of CH4, CO2 and H2O, and inhibits carbon deposition.

The application provides a synthesis method of high-hygroscopic-dispersing-dye easy-to-dye functional polyester, which comprises the following steps: step one, esterification one-pot; step two, esterification two-pot; step three, final polymerization pot (polycondensation); and step four, discharging and slicing. The polyester is prepared by a continuous polymerization or an intermittent polymerization mode, p-terephthalic acid, ethylene glycol and ethylene glycol antimony are added in the esterification one-pot, polyethylene glycol, nano montmorillonite, cobalt acetate, stabilizer Irganox1010 and triphenyl phosphite are added in the esterification two-pot; the low-temperature coloring and the hygroscopic property of the polyester are realized by adding the polyethylene glycol, the easy-to-dye and the hygroscopic property of the polyester are realized by adding the nano montmorillonite, the ethylene glycol antimony is added as a catalyst, the polymerization reaction and the stability of the polyester are realized by adding the cobalt acetate, the stabilizer Irganox1010 and the triphenyl phosphite, and finally the easy-to-dye and the hygroscopic effect of the polyester are realized.

The application belongs to the technical field of electrochemical bifunctional overall water splitting catalyst materials, and particularly relates to a bifunctional boron-doped molybdenum-cobalt microsphere overall water splitting catalyst as well as a preparation method and application thereof. ‑2 The application is prepared by dissolving ammonium heptamolybdate and cobalt acetate tetrahydrate in water in a small amount of sulfuric acid and sodium citrate borate system according to a certain molar ratio, heating to a transparent liquid at a constant temperature, taking foamed nickel as a working electrode, taking a platinum sheet and an Ag / AgCl electrode as a counter electrode and a reference electrode, and taking a current density of-300 to-200 mA cm ‑2 at 20-50 DEG C for 10-30 minutes, rinsing the surface of the foamed nickel with deionized water after the electrodeposition is completed, and vacuum drying to obtain a black microsphere boron-doped MoCo material loaded on the foamed nickel. The catalyst prepared by the application has the characteristics of low cost, non-toxicity, high chemical activity and stability, exhibits high hydrogen evolution and oxygen evolution activity, and low overpotential.

The application discloses a preparation method of a low-noble-metal heterojunction fuel cell catalyst, which comprises the following steps: (1) preparing Pt-Co alloy nanoparticles; (2) preparing a cobalt acetate ethanol solution, placing the Pt-Co alloy nanoparticles in the cobalt acetate ethanol solution, stirring, growing a cobalt acetate film layer on the outer surface of the Pt-Co alloy nanoparticles, and obtaining the low-noble-metal heterojunction fuel cell catalyst. The preparation method can effectively reduce the use of Pt, reduce the preparation cost of the catalyst, and is suitable for large-scale application. The low-noble-metal heterojunction fuel cell catalyst has high oxygen reduction activity and can effectively improve the catalytic reaction efficiency.

The invention discloses a graphene oxide / cobalt-nickel sulfide loaded nickel-manganese layered double hydroxide, which is prepared by the following steps: firstly, by taking nickel acetate tetrahydrate, cobalt acetate tetrahydrate, thiourea, ethylene glycol and graphene oxide as raw materials, preparing black graphene oxide loaded cobalt-nickel sulfide rGO / NiCo2S4 (rGO / NCS for short) through a hydrothermal method; then, nickel chloride hexahydrate, manganese chloride tetrahydrate, hexamethylenetetramine and deionized water are used as raw materials, rGO / NCS is used as a carrier, layered hydroxide NiMn-LDH is loaded through a hydrothermal method, and grey green graphene oxide / cobalt nickel sulfide loaded nickel manganese layered double hydroxide rGO / NiCo2S4 / NiMn-LDH is obtained; the microstructure is of a flower-shaped structure, and the size is 1-2 microns. When the material is used as a supercapacitor electrode material, the material is charged and discharged in a range of 0-0.5 V, and when the discharge current density is 1Ag <-1 >, the specific capacitance of rGO / NCS / NiMn-LDH is 1900-2000Fg <-1 >; when the discharge current density is 10 Ag <-1 > and the cycle index is 5000, the capacitance retention rate is 60-70%, and the coulombic efficiency is 90-100%.

The application belongs to the technical field of electrochemical energy storage materials, and particularly relates to a cobalt Prussian blue positive electrode material and a preparation method and application thereof. The application uses sodium citrate dihydrate as a structure directing agent, forms a precursor solution by dissolving sodium citrate dihydrate and cobalt acetate in water together, drops the precursor solution into a potassium cobalt cyanide aqueous solution in a linear manner, stirs the reaction under a fixed rotating speed, and obtains the cobalt Prussian blue positive electrode material after freeze-drying. The application realizes precise construction of the nanostructure of the product by regulating the coordination environment of sodium citrate and cobalt ions and the dropping process. The obtained material is composed of highly dispersed and uniform nanocubes, has high crystallinity and no agglomeration. When the material is used as a positive electrode of a water-based zinc ion battery, it has high specific capacity, excellent rate performance and super-long cycle stability, and has a wide application prospect in the field of large-scale energy storage.

The present application relates to the technical field of catalyst preparation, in particular to a Co-N-C catalyst and its application in the synthesis of glycolic acid from glycol, which comprises the following steps: step one: adding cobalt acetate tetrahydrate and 1,10-phenanthroline into a solvent to mix, obtaining a mixture, heating the mixture in an oil bath, then adding a template agent into the heated mixture to stir; step two: removing the solvent in the mixture by rotary evaporation to obtain a mixed solid, grinding the mixed solid into fine powder after vacuum drying; step three: pyrolyzing the fine powder under a nitrogen atmosphere to obtain a pyrolysis product; step four: treating the pyrolysis product with acid washing to remove the template agent, then vacuum drying to obtain the Co-N-C catalyst; the present application solves the problems of low catalyst activity, poor selectivity, poor stability and high cost of noble metal catalysts in the existing technology of catalytic dehydrogenation of glycol to glycolic acid.

The present invention relates to a method for preparing an efficient and stable porous PtCoV fuel cell cathode catalyst, belonging to the field of new energy nanomaterials and catalytic technology. The main purpose is to solve the problems of low utilization rate of precious metal atoms, limited activity, and poor stability in Pt catalysts. The main scheme is to use electrospinning technology to prepare cobalt acetate tetrahydrate Co(Ac)2·4H20, vanadium diacetylacetonate C 10 H 14 PAN / Pt / Co / V composite nanofibers were constructed using O5V, chloroplatinic acid (H2PtCI6·6H2O), polyacrylonitrile (PAN), and N,N-dimethylformamide. These fibers were then hydrolyzed in a mixture of ethanol, water, and ammonia, and tetraethyl orthosilicate was added. This resulted in a layer of silicon dioxide (SiO2) coating the composite fibers. This was then pyrolyzed and etched with HF to remove the inactive SiO2 and excess metal precursors. Leveraging the confinement effects of the excess transition metal salt, PAN, and SiO2 coating, along with the high-temperature-driven Kirkendall effect, a porous PtCoV alloy catalyst embedded within a hollow, porous carbon fiber support was effectively prepared.