47 results about "Cobalt(II) nitrate" patented technology

The invention relates to a preparation method of a positive electrode material of a lithium-sulfur battery. The preparation method comprises the following steps of enabling cobalt nitrate and 2-methylimidazole to be dissolved into a solvent and performing standing, centrifuging and drying to obtain ZIF-67; performing carbonization on ZIF-67 in inert atmosphere and performing cooling to the room temperature to obtain Co-N-C; and performing carbonization on Co-N-C and dicyandiamide in the inert atmosphere, and performing cooling to the room temperature to obtain CNT@ Co-N-C. The lithium-sulfur battery comprises the positive electrode material used for the lithium-sulfur battery. Beneficial effects are achieved as follows: compared with the single metal organic framework compound-based composite material, the specific surface area and the conductivity of the positive electrode material disclosed in the invention are enlarged and improved, and sulfur load can be realized more effectively;in addition, a shuttle effect of polysulfide in the battery reaction process can be suppressed more effectively; and a constant-current discharge test on the assembled battery proves that the electrochemical performance of the composite material with the carbon nanotubes in an in-situ growth manner is more excellent.

The invention discloses a nickel-cobalt oxide electrode material as well as a preparation method and applications thereof. The nickel-cobalt oxide electrode material is NiCo2O4 oxide prepared by adopting a hydrothermal method. The method concretely comprises the following steps: adding nickel nitrate (Ni(NO3)2.6H2O) and cobalt nitrate (Co(NO3)2.6H2O) into distilled water and fully mixing, adding urea and methanol to provide hydroxyl groups, and adding PVP as a complexing agent, and reacting in a reaction kettle to obtain NiCo2O4 oxide. Different material shapes can be obtained by adopting different reaction parameters, so that different lithium ion battery performances can be realized. The method has the advantages of being simple in technology, wide in the sources of raw materials, capable of performing large-scale production, and the like. The first discharge capacity of the lithium ion battery cathode material prepared from the material can achieve 2000mAh/g, the capacity has no obvious change after being circulated for 20 times, and the charging and discharging performances are excellent. By adopting the lithium ion battery prepared, the capacity is high, the cyclic performance is good and the lithium ion battery can be used for industrial production.

The invention discloses a preparing method of cobalt nanometer materials. The preparing method comprises the following steps that firstly, cobalt-nitrate hexahydrate, a complexing agent and a dispersing agent are sequentially added into 0.1 L of deionized water, magnetic stirring is carried out, and a mixed solution is obtained; secondly, the solution is placed in a drying box with the temperature of 150-200 DEG C to be dried till the loose porous state is achieved; and thirdly, a precursor is placed in a tubular furnace with the temperature of 300-500 DEG C to be roasted at the high temperature for 5-7 hours, and then the cobalt nanometer materials can be obtained. Cobalt nitrate containing six kinds of crystal water and several common carbohydrate are adopted as raw materials, the raw materials are cheap and easy to obtain, cost is low, and industrial production is greatly facilitated.

A method for producing a cobalt on alumina catalyst is disclosed. The catalyst is prepared by thoroughly mixing cobalt nitrate into a peptized alumina slurry, and then spray-drying the slurry to form attrition resistant microspheres. The cobalt prepared by this invention is fully reducible. Optionally, metals such as ruthenium can be added to the cobalt/alumina catalyst by impregnation or methods known in the prior art.

The invention relates to a preparation method for a manganese-lithium phosphate and carbon nano tube nanocomposite. The method comprises the following processes: dripping phosphoric acid into a lithium hydroxide solution to prepare lithium phosphate, then adding manganese salt and ferric salt into a lithium phosphate dispersing solution and stirring uniformly to obtain a precursor solution, conducting a heat seal reaction to obtain manganese-lithium phosphate or iron-doped manganese-lithium phosphate, adding the manganese-lithium phosphate or iron-doped manganese-lithium phosphate and cobalt nitrate into deionized water, mixing, then dripping a sodium hydroxide solution, and washing, filtering in a suction manner, grinding, calcinating, reducing and growing a precipitate to obtain the manganese-lithium phosphate and carbon nano tube nanocomposite or an iron-doped manganese-lithium phosphate and carbon nano tube nanocomposite. According to the nanocomposite prepared with the method, a carbon nano tube grows uniformly on the manganese-lithium phosphate, the degree of graphitization is high, the process is simple, the defect of low electronic conductivity of manganese-lithium phosphate or iron-doped manganese-lithium phosphate is overcome, the charge and discharge properties of the nanocomposite are improved, and the application prospect is broad.

The invention relates to a preparation method for a Cu-Co-S-MOF nanosheet, which comprises the following steps: S1, cobalt nitrate hexahydrate is dissolved in deionized water to obtain a solution A, 2-methylimidazole is dissolved in deionized water to obtain a solution B, the solution A and the solution B are mixed, clean foamed nickel is then added for reaction, and foamed nickel with Co-MOF is obtained; S2, copper nitrate hexahydrate and the cobalt nitrate hexahydrate are dissolved in isopropanol, a mixed solution C is obtained after dissolution, and carbon disulfide and pentamethyldiethylenetriamine are added to the mixed solution C, and a mixed solution D is obtained; and S3, the foamed nickel with Co-MOF is added to the mixed solution D and is transferred to a reactor for a hydrothermal reaction, and after the reaction, the Cu-Co-S-MOF nanosheet is obtained. Compared with the prior art, the preparation method is environmentally-friendly, the preparation method is simple, large-scale production is facilitated, the obtained Cu-Co-S-MOF nanosheet can be applied to an electrode material, and excellent electrochemical performance can be obtained.

The invention relates to a cobalt-iron bimetal in-situ doped MCM-41 catalyst, a preparation method thereof, and an application of the catalyst in the degradation of dye wastewater. The preparation method comprises the following steps: an ethyl orthosilicate-ethanol mixed solution is added dropwise to an aqueous solution of cetyltrimethylammonium bromide and sodium hydroxide, the obtained solutionis continuously stirred to form a gel, an ethanol-water solution of cobalt nitrate and iron nitrate is added to the gel, the obtained mixture is crystallized in a reaction kettle, and the crystallizedmixture is filtered, washed, dried and calcined to obtain the MCM-41 molecular sieve catalyst with the framework doped with CoFe. The catalyst can be used to degrade methyl orange in the dye wastewater. The CoFe/MCM-41 catalyst has the advantages of simple preparation process, good structural stability, and uniform dispersion of metals in the molecular sieve framework, and can efficiently degradethe methyl orange by activating PMS or H2O2 under the action of microwave radiation.

The invention belongs to the technical field of nanometer material synthesis and relates to a "Z-Scheme" Co3O4/g-C3N4 composite system which is synthesized by one step by using a simple and rapid hydrothermal method and can be used for degrading tetracycline hydrochloride under visible light, wherein the surface of g-C3N4 is modified by a mesoporous Co3O4 nanosphere composed of monocrystal nanodots in the system. A sample is prepared by the steps: firstly, preparing g-C3N4 for later use; and then, controllably preparing the "Z-Scheme" Co3O4/g-C3N4 composite system, accurately weighing a certain quantity of cobaltous nitrate hexahydrate and cetyltrimethyl ammonium bromide, dissolving cobaltous nitrate hexahydrate and cetyltrimethyl ammonium bromide into a mixed solution of deionized water and methanol, then, adding g-C3N4, carrying out magnetic stirring for 24h after carrying out ultrasonic dispersion for 30min, then, transferring a suspension liquid into a 50ml high-pressure reactor, carrying out reaction in a baking oven at 180 DEG C for 24h to obtain a dark yellow sediment, and then, carrying out centrifuging, cleaning and drying.

The invention provides an active material used for a capacitor electrode and a preparation method of the active material. The preparation method comprises the following steps: nickel nitrate hexahydrate and/or cobalt nitrate hexahydrate are adopted as raw materials to prepare a mixed solution of 1-methyl-2-pyrrolidone and water; backflow stirring and solvent thermal reaction are performed on the mixed solution so that a hydroxide precursor is obtained; thermal treatment is performed on the precursor so that a nickel oxide, a cobalt oxide or a nickel and cobalt oxide active material is obtained. The manufactured nickel and cobalt oxide material is multistage and porous so that contact of the material and an electrolyte and transmission of ions can be effectively enhanced. Besides, because of the multistage structure of the material, a problem of agglomeration in the cycle process of nano-materials can be prevented. Any surfactants or soft and rigid templates are not introduced to the preparation process of the material so that the whole preparation process is simplified.

The invention discloses a preparation method for cobalt nanoparticles. According to the preparation method, cobalt nitrate is used as a raw material, low molecular alkylol amine is used as a reducing agent, vinyl pyrrolidone is used as a surfactant and a stabilizer, and absolute ethyl alcohol, absolute methyl alcohol or absolute propyl alcohol is used as a solvent; and the preparation method comprises the following steps of: dissolving the materials respectively and mixing uniformly; reacting with stirring under the temperature condition of 60-80 DEG C until the color of reaction solution becomes stable dark yellow; naturally cooling to room temperature; and concentrating and drying to obtain spherical cobalt nanoparticles. The method provided by the invention has the advantages of low toxicity in production, low production temperature, simple production process, simple equipment and low production cost; and the obtained cobalt nanoparticles are spherical and have high dispersibility and average particle diameter of not greater than 10 nm.

The invention discloses a cobalt-nitrogen doped carbon composite material and a preparation method thereof. The cobalt-nitrogen doped carbon composite material is prepared from cobalt nitrate, dopamine and melamine; the preparation method comprises the steps that cobalt nitrate, magnesium nitrate, aluminum nitrate and urea are added into deionized water, the solution is heated to 100 DEGC, and a layered double hydroxide is prepared; the layered double hydroxide is prepared into a solution after being washed; the ph value of the solution is regulated to be a slightly alkaline value, and dopamine hydrochloride is added; after a sample is dried and stirred with melamine to be uniform, and then thermal treatment is performed; a sample is sufficiently washed and dried. The prepared composite material is a high-performance oxygen reduction catalyst and has the good cyclic stability.

The invention provides a method for preparing a high-remanent-polarization BiFeO3 film with preferentially growing (110) crystal face by a sol-gel process, which comprises the following steps: dissolving bismuth nitrate, ferric nitrate, neodymium nitrate and cobalt nitrate used as raw materials in a mol ratio of 0.90:(1-x):0.15:x (x=0.01-0.03) in mixed ethylene glycol monomethyl ether and acetic anhydride (in a volume ratio of 3:1) to obtain a stable BiFeO3 precursor solution with the metal ion concentration of 0.3 mol/L, wherein bismuth ions are 5% excessive to compensate the volatilization in the film annealing process; and evenly coating the BiFeO3 precursor solution on an FTO (fluorine-doped tin oxide) substrate, drying to obtain a dry film, and carrying out layer-by-layer quick annealing at 550 DEG C to obtain the crystalline BiFeO3 film with expected thickness. The facility requests are simple, the experimental conditions can be easily achieved, and the BiFeO3 film with preferentially growing (110) crystal face, of which the remanent polarization is higher than 130 mu C/cm<2>, can be prepared by accurately controlling the solvent ratio of the precursor solution and the codoping of the A-B position.

The invention relates to a silver nanoparticle-dispersed cobalt oxide functional thin film material and a preparation method, and belongs to the field of photocatalysis. The material is characterized in that the general formula of chemical compositions of the thin film material is Agx / (Co3O4) 1-x, wherein x indicates the mole fraction of constituent element of Ag, and x ranges from 0.01 to 0.85. In the process, cobalt nitrate and silver nitrate are used as raw materials, and ethylene glycol monomethyl ether is used as a solvent; a precursor solution with accurate stoichiometric proportion and uniform compositions is synthesized by chemical solution method, and film is coated on a glass substrate by a spin coater, and finally the Agx / (Co3O4) 1-x composite film is obtained by thermal decomposition and annealing. Silver nanoparticles are uniformly dispersed in a cobalt oxide matrix, and the diameter of the silver particle is 1- 500nm; and the film can observe the plasma resonance absorption peaks of metal particles at a wave band of 350-450nm, and the film has excellent photocatalytic properties under the irradiation of visible light.

The invention relates to a preparation method of a cobalt and nitrogen codoped carbon nanoparticle-carbon nanotube composite material, and belongs to the technical field of preparation of nanocomposite materials. The problems of complex process, high cost, special expensive devices and adversity to large-scale production of existing preparation methods are solved. The preparation method of the cobalt and nitrogen codoped carbon nanoparticle-carbon nanotube composite material mainly adopts CdS nanowires, dopamine and cobalt nitrate as raw materials, the CdS nanowires are coated with the dopamine in the presence of cobalt nitrate, and the obtained sample undergoes high temperature calcination to obtain the composite material. The mass ratio of the CdS nanowires to the cobalt nitrate is controlled to adjust the morphology of the obtained material. The preparation method has the advantages of simple process and low cost. The composite material has a large specific surface area and rich meso-porous structures, so the material has an excellent oxygen reduction electrocatalysis performance, and has a wide application prospect in the fields of fuel cells, biological sensing, metal-air cells and supercapacitors.

The invention discloses a catalyst for the Fenton reaction. The catalyst is prepared from ferrous sulfate, copper sulfate and cobalt nitrate by dissolving ferrous sulfate, copper sulfate and cobalt nitrate in deionized water and then adjusting the pH value of the obtained aqueous solution of the metal salts to 3 to 4, wherein a mol ratio of ferrous sulfate to copper sulfate to cobalt nitrate is 1: 0.5: 1 to 1: 6: 1, and the ratio of the total amount of ferrous sulfate, copper sulfate and cobalt nitrate to the usage amount of deionized water is 0.8 to 1.5 mol: 1 L. The invention also discloses application of the catalyst for the Fenton reaction to treatment of electroplating wastewater containing organic matter complexes. The catalyst for the Fenton reaction is a composite catalyst containing ferrous iron, copper and cobalt and is simple to prepare; the catalyst can effectively eliminate organic matters in complexation states, and the removal rate of heavy metal complexes can reach 99% or above; and the catalyst allows nickel in effluent to reach the standard, enables the removal rate of COD to reach 85% or above and substantially reduces the COD value of the effluent.

The invention belongs to the field of preparation of electrode materials for supercapacitors, in particular to flexible composite electrode material, a preparation method and an application thereof. The flexible composite electrode material of the invention is prepared by uniformly mixing graphene oxide, H2SO4 and phytic acid in aqueous solution, transferring the mixture to a hydrothermal kettle,and hydrothermally reacting to obtain thiophosphorus doped graphene; Mixing anhydrous niobium pentoxide and hydrofluoric acid, transferring to a reaction kettle, hydrothermally reacting, adding ammonium oxalate, sulphur phosphorus doped graphene and cobalt nitrate into the obtained reaction liquid B, placing the mixture into a melamine sponge, raising the temperature, adding methyl amine solution,and obtaining cobalt niobium precursor; CoNb2O6/graphene/melamine sponge flexible composite electrode material was prepared by calcining melamine sponge under nitrogen atmosphere. The reaction condition of the invention is mild, easy to control and the process is simple; The prepared CoNb_2O_6 has good dispersibility, uniform and controllable size, and has high reversible specific capacitance when used as flexible electrode of supercapacitor, so it is expected to be industrially produced.

The invention discloses a method for preparing a cobalt carbonate-cobalt phosphate composite photocatalyst. The method comprises the following specific steps: weighing 12mmol to 16mmol of cobalt nitrate, preparing a 12mmol/L cobalt nitrate solution, weighing 6.6mmol to 8mmol of sodium carbonate, and preparing a 16mmol/L sodium carbonate solution; mixing the two kinds of solutions at the revolution rate of 350rpm to 400rpm so as to form a colloidal substance, carrying out sustained stirring for 3 to 4 hours, and subjecting sodium carbonate and cobalt nitrate to a reaction during stirring, so as to produce cobalt carbonate colloid; putting the cobalt carbonate colloid in a semi-permeable membrane bag, washing with distilled water for 3 to 4 times so as to remove free ions, then, adding the cobalt carbonate colloid into 60mL to 80mL of 2mol/L to 4mol/L sodium phosphate solution, carrying out soaking for 2 to 4 days so as to form cobalt phosphate nanoparticles on surfaces of cobalt carbonate particles, carrying out solid-liquid separation, washing solids with deionized water for 2 to 3 times, and carrying out drying at the temperature of 75 DEG C to 105 DEG C, thereby preparing the cobalt carbonate-cobalt phosphate composite photocatalyst. According to the method, a catalyst is formed on the surface of cobalt carbonate, and the catalyst and a support are combined tightly.

The invention provides a preparation method of a nickel boride base oxygen evolution catalyst. The method comprises the following steps that a nickel net used for an afflux base is soaked in diluted hydrochloric acid to remove an oxidation layer, then ultrasonically washed with ethyl alcohol and redistilled water in sequence, and dried on the vacuum condition for standby application; a cobalt nitrate water solution and a sodium hydroxide solution of sodium borohydride are prepared respectively, and dissolved oxygen in the cobalt nitrate water solution and the sodium hydroxide solution of the sodium borohydride are removed for standby application; the nickel net is sequentially soaked in the cobalt nitrate water solution and the sodium hydroxide solution of the sodium borohydride, one-timesoaking in the cobalt nitrate water solution and the sodium hydroxide solution of the sodium borohydride is taken as one circulation, the circulation is repeated for a plurality of times, and a cobaltboride nanometer layer is generated on the surface of the nickel net and dried to obtain the nickel boride base oxygen evolution catalyst. The preparation method has the following beneficial effectsthat in comparison with a conventional method of synthesizing boride powder firstly and then dripping and spraying the solution to the afflux base, higher electrochemical stability and activity are possessed.

The invention discloses a double-core-cobalt bacteriostatic material and a preparing method thereof. The double-core-cobalt bacteriostatic material is a 5-methoxymethyl isophthalic acid cobalt coordination polymer, and the chemical formula of the basic structural unit is [CoL(bpa)], wherein L represents the complete proton-stripping state of 5-methoxymethyl isophthalic acid, and bpa represents 1,2-bis(4-pyridyl)ethane. According to the double-core-cobalt bacteriostatic material and the preparing method thereof, a hydrothermal reaction method is utilized, 5-methoxymethyl isophthalic acid and 1,2-bis(4-pyridyl)ethane serve as ligands and cobalt nitrate or cobalt acetate serves as a metal source, and 5-methoxymethyl isophthalic acid, 1,2-bis(4-pyridyl)ethane and cobalt nitrate or cobalt acetate are heated in water for 3 days at 130 DEG C to obtain the coordination polymer. The 5-methoxymethyl isophthalic acid cobalt coordination polymer has a double-core-cobalt structure; under the concentration of 2.5 g/L, the coordination polymer has the bacteriostatic annulus diameter of 17.00 mm on staphylococcus aureus, and has the bacteriostatic annulus diameter of 19.2 mm on escherichia coli, and can serve as the bacteriostatic material.

The invention discloses a nanometer copper-based catalyst and a preparation method thereof, and belongs to the field of chemistry. Dimethylimidazole and cobalt nitrate hexahydrate are used as raw materials for mixed calcination; a porous hollow nanometer crystal lattice is formed; then, copper nitrate hexahydrate is added; copper ions are mixed into the crystal lattice; the ligand active bodies are formed; the catalysis oxygen generation activity is enhanced in light driving water oxidization; the oxidization efficiency is improved. Cyanoguanidine and ammonium metavanadate are used as raw materials; through calcination, catalyst precursors doped with graphite phase carbon nitride are obtained; the oleic acid loading catalysis quantity is improved; the consumption of catalysts is reduced. The ferric trichloride hexahydrate, anhydrous sodium acetate, 1,6-hexamethylenediamine and the like are used as raw materials for forming magnetic loading articles; the superparamagnetic property is realized; the catalyst can be recovered to be repeatedly utilized; the use efficiency of the catalyst is improved. The catalyst and the preparation method solve the problems of low catalysis activity and great addition quantity of the existing catalyst.

The invention discloses a preparation method for an acid-alkali-resistant adherent enamel plate, and belongs to the technical field of decorative materials. According to the preparation method for theacid-alkali-resistant adherent enamel plate, quick lime and water react with each other to generate calcium hydroxide, the calcium hydroxide reacts with sulfate in blast furnace slag to generate dihydrate gypsum, high-density sintering of glaze is facilitated, and then the enamel plate surface has the high hardness and wear resistance; heavy metal ions in the glaze of the blast furnace slag mostly exists in the form of the sulfate, the heavy metal ions in the glaze can achieve complexing with triethanolamine, hydrogen ions are consumed under the acidic condition, and aluminum ions in the glaze and the heavy metal ions generate hydrated silicate on the surface under the alkaline condition; and cobalt nitrate and nickel nitrate are taken as an adherence promoter for the glaze, the cobalt nitrate and the nickel nitrate are molten and decomposed into cobalt oxide and nickel oxide at the low temperature in the firing process, therefore, the adherence of the glaze can be improved, the highacid and alkali resistance is achieved, and the wide application prospect is achieved.