393 results about "COBALTOUS NITRATE HEXAHYDRATE" patented technology

The invention discloses a preparation method of a cobalt electro-catalysis oxygen reduction material wrapping a nitrogen-doped carbon nanotube. The method includes the following steps of making melamine, cobalt nitrate hexahydrate and glucose react to obtain a self-assembled melamine precursor, and baking the self-assembled melamine precursor to obtain a cobalt nanoparticle hybrid material electro-catalysis oxygen reduction agent wrapping the nitrogen-doped carbon nanotube. In preparation of the precursor, a self-assembled body can be formed through the electrostatic interaction and the hydrogen-bond interaction by means of nitrate radicals and melamine under the acid condition, cobalt ions are adsorbed into the self-assembled body, ordered arrangement and assembly of materials in the high-temperature baking process are facilitated by the pre-assembled precursor, and therefore more catalysis active sites are exposed, and the improvement of the performance of a catalyst is facilitated.

The invention provides an electrocatalyst with a cobalt-based multi-stage nano-composite structure for oxygen production by electrolysis of water and a preparation method of the electrocatalyst. The preparation method comprises the following steps: dissolving cobalt nitrate hexahydrate, urea and ammonium fluoride in deionized water to obtain a precursor solution; transferring the precursor solution into a hydrothermal reactor; adding carbon fiber paper; enabling basic cobalt carbonate nanowires to grow on the carbon fiber paper through solvothermal reaction; after finish of reaction, naturally cooling; then taking out a product; washing and drying to obtain a carbon fiver paper loaded basic cobalt carbonate nanowire composite structure; by taking powdered sulfur as the raw material, preparing a carbon fiber paper loaded cobalt sulfide nanowire composite structure through low-temperature sulfuration reaction under the condition of an inert gas; and finally, electroplating the surface of the carbon fiber paper loaded cobalt sulfide nanowire composite structure with a layer of cobalt hydroxide nanosheets by use of the electrochemical deposition method so as to obtain the electrocatalyst with the cobalt-based multi-stage nano-composite structure for oxygen production by electrolysis of water. As the sulfide and the hydroxide of transition metal cobalt are adopted as the catalyst, in comparison with noble metals, the cost of the catalyst is lowered.

The invention discloses a preparation method of novel metal organic complex fibers and derivative porous carbon fibers thereof. The method comprises the following steps: respectively adding certain amounts of a precursor (zinc nitrate hexahydrate / cobalt nitrate hexahydrate) and dimethylimidazole to a methanol solution, and magnetically stirring above materials to obtain metal organic complex nano-particles; dispersing the metal organic complex nano-particles in an N,N-dimethyl formamide solution, and adding polyacrylonitrile to obtain an electrospinning solution; carrying out an electrospinning technology to obtain metal organic complex / polyacrylonitrile electrospinned fibers, collecting the metal organic complex / polyacrylonitrile electrospinned fibers with a copper mesh, and peeling to obtain a metal organic complex / polyacrylonitrile film; and calcining the film to obtain porous carbon fibers. The preparation method has the advantages of simple operation and high yield; and the derivative porous carbon fibers have high specific surface area and good electrocatalytic activity, and have very great application prospect in the fields of energy storage and conversion.

The invention relates to a preparation method of a NiCo2S4-coated porous carbon skeleton for a positive electrode material of a lithium-sulphur battery. The preparation method comprises the followingsteps: preparing a nitrogen-doped porous carbon skeleton; preparing a C@NiCo-LDH composite material: adding the nitrogen-doped porous carbon skeleton prepared in the last step, cobalt nitrate hexahydrate, nickel nitrate hexahydrate, urotropin and sodium citrate according to the molar ratio of (10-15): (60-120): (30-60):30:10 into deionized water, after stirring uniformly, carrying out oil bathingat a temperature of 70-90 DEG C, carrying out condensation and returning for 3-6 hours, centrifuging reaction products using the deionized water and alcohol, drying to obtain the NiCo-LDH-coated porous composite material which is marked as C@NiCo-LDH; preparing the C@NiCo2S4 composite material; and loading sulfur on the C@NiCo2S4 composite material.

The invention discloses a simple, easy-to-operate and environmentally friendly method for synthesizing a three-dimensional structure Co-MOF / NF material in situ. With a cobalt nitrate hexahydrate adopted as a cobalt source, terephthalic acid as an organic ligand, N,N-dimethylformamide as a solvent, absolute ethyl alcohol as an additive, and foamed nickel as a substrate, a one-step solvothermal method is adopted to obtain Co-MOF / NF; when being used as supercapacitor self-supporting electrode material, the Co-MOF / NF exhibits ultra-high area ratio capacitance (13.6 F cm<-2>), the performance of the Co-MOF / NF is far superior to the performance of previously reported MOF-based materials. With the method of the invention adopted, problems such as large contact resistance, insufficient applicationof active materials, and complex electrode preparation processes which are caused by the application of powder electrode materials can be solved. The Co-MOF / NF material is a novel energy storage material which has the advantages of ultra-high area specific capacitance, excellent rate performance and low cost.

The invention discloses a preparation method of a transition metal sulfide composite nanometer material and belongs to the technical field of preparation of transition metal sulfides. The preparationmethod comprises the following steps of dissolving cobalt nitrate hexahydrate and 2-methylimidazole into methanol, performing stirring at a room temperature, performing still standing on an obtained solution for 12-36h at the room temperature, and preparing an ZIF-67 precursor; dissolving the cobalt nitrate hexahydrate and the ZIF-67 precursor into ethanol, performing dispersion, and performing stirring at the room temperature to form an Ni-Co-LDH intermediate; dispersing the intermediate in deionized water, adding a sulfur source and a molybdenum source, performing full stirring, transferringa mixture into a reaction kettle, adopting a hydrothermal method to perform stepwise temperature rising on the intermediate, then collecting a product through centrifugal washing, and drying at a certain temperature to obtain an NiCo2S4@MoS2 nanometer material. The preparation method provided by the invention is simple and green without pollution and is high in practical degree; and the obtainedNiCo2S4@MoS2 nanometer material can be directly used as an electrode material for a supercapacitor.

The invention discloses a preparation method for a metal organic framework-derived tricobalt tetroxide-modified titanium dioxide nanotube array. The method comprises the following steps: firstly performing pretreatment on a titanium sheet substrate material; performing electrochemical treatment on the treated titanium substrate material by using an ethylene glycol solution containing ammonium fluoride and water as an electrolyte, and performing calcination by using a muffle furnace to change a titanium dioxide crystal form; secondly, performing cobalt hydroxide electrodeposition by means of athree-electrode electrochemical workstation and by using cobalt nitrate hexahydrate as an electrolyte, a titanium dioxide nanotube array as a working electrode, a platinum sheet as a negative electrode and silver / silver chloride as a reference electrode; performing hydrothermal treatment on the titanium dioxide nanotube array to form ZIF-67 in situ; and finally, performing secondary calcination byusing a muffle furnace to obtain the ZIF-67-derived porous tricobalt tetroxide-modified titanium dioxide nanotube array. The method disclosed by the invention can effectively improve absorption capacity of TiO2 on visible light, promote separation of electron hole pairs, and improve photocatalytic degradation efficiency of organic pollutants.

The invention relates to a preparation method of three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres, and relates to the technical field of multi-level structured nano-grade catalyst materials. First, nickel nitrate hexahydrate and cobalt nitrate hexahydrate are adopted as a nickel source and a cobalt source, a deionized water-isopropanol mixed phase with a proper proportion is adopted as a solvent, methanol is adopted as a reactant, and no additional base precipitating agent is adopted; a three-dimensional flower-shaped nano-sheet microsphere precursor is prepared in a Ni<2+>-Co<2+>-NH3-NH4<+>-SG<n->-H2O-IPA-CH3OH system (SG<n-> is CO3<2-> or HCOO<->); the temperature is increased to 300-400 DEG C in an air atmosphere with a speed of 1 DEG C / min, and the precursor is calcined for 2-3h, such that the three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres are obtained. According to the invention, co-precipitation of the formulated cobalt and nickel in the raw materials is realized. The prepared three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres are spinel cubic phases with high purity, and are formed by ultrathin nano-sheet self-assembly. The microspheres comprise rich mesopores, and have a large specific surface area. The method has the advantages of simple operation, appropriate conditions and easy control.

A metal oxide-loaded molecular sieve catalyst comprises pure cryptomelane type manganese dioxide and transition metal. A method for preparing the molecular sieve catalyst comprises the following steps: 1, preparing solution of potassium permanganate; 2, preparing solution of manganese acetate; 3, adding the solution obtained by the step one into a three-neck flask, and heating, condensing and refluxing the solution; 4, adding the solution obtained by the step two into the three-neck flask of the step three, condensing and refluxing the solution, filtering and drying the obtained black pasty sediment, and roasting the sediment to obtain an octahedral manganese oxide molecular sieve catalyst (OMS-2) solid; 5, adding cerium ammonium nitrate, cobalt nitrate hexahydrate, copper nitrate trihydrate, ferric nitrate nonahydrate or yttrium nitrate into deionized water to form solution; and 6, mixing the solid taken from the step four and the solution in the step five, soaking cerium on the octahedral manganese oxide molecular sieve catalyst (OMS-2) solid, and drying and roasting the obtained solid to obtain the metal oxide-loaded molecular sieve catalyst. The metal oxide-loaded molecular sieve catalyst has the characteristics of high purification efficiency, low price and good thermal stability.

The invention relates to a molybdenum disulfide-cobalt disulfide / graphene composite hydrogen evolution electro-catalysis material and a preparation method and belongs to the field of electro-catalysishydrogen evolution. The molybdenum disulfide-cobalt disulfide / graphene composite hydrogen evolution electro-catalysis material is mainly prepared through the following steps that firstly, an advancedHummers method is adopted to prepare graphene oxide; then with sodium molybdate dihydrate, cobalt nitrate hexahydrate, thiourea, graphene oxide and deionized water as raw material, and through a one-step solvent thermal reaction method under 200 DEG C, the ternary molybdenum disulfide-cobalt disulfide / graphene composite hydrogen evolution electro-catalysis material is prepared; and the electro-catalysis hydrogen evolution performance is analyzed. The preparation method has the beneficial effects of being easy to operate, low in energy consumption and the like; transition metal of cobalt and molybdenum for use is low in price, and it is hopeful that the material is applied in industrial production; and besides, a electro-catalysis hydrogen evolution performance test shows that the preparedmolybdenum disulfide-cobalt disulfide / graphene composite hydrogen evolution electro-catalysis material is large in electronic transmission rate and good in hydrogen evolution performance.

The invention discloses a preparation method for a cobalt-doped zinc oxide gas-sensitive material and application thereof, which relate to the technical fields of material chemistry and gas-sensitivesensors. Polyvinylpyrrolidone (PVP), zinc acetate and cobalt nitrate hexahydrate are dissolved in 75ml of ethylene glycol, wherein polyvinylpyrrolidone, the molecular weight of which is 400,000, is 0.3g, the molar ratio of cobalt nitrate hexahydrate to zinc acetate is between 0.025 and 0.233, and thereby the cobalt-doped nanoscale spherical zinc oxide gas-sensitive material is prepared. Because amicrowave-and-ultrasonic wave-co-assisted solvothermal method is adopted in the process of preparation, the cobalt-doped nanoscale spherical zinc oxide material has high detection sensitivity and goodselectivity; and the preparation method is simple and harmless to the environment, and effectively overcomes defects existing in the prior art, for example, preparation methods are complex and cost is higher and production process conditions are strict, and sensors have high working temperature, low response and recovery speed and short service lives.

The invention relates to a preparation method and application of a metal-organic framework material. The preparation method of the metal-organic framework material comprises the following steps: (1) adding cobalt nitrate hexahydrate and 5-(4-(5-tetrazyl) phenyl)m-phthalic acid into a mixed solvent of N,N-dimethylformamide and water, and stirring evenly to obtain mixed liquid; (2) putting the mixed liquid into an airtight high pressure reaction still, heating to 110 to 110 DEG C, preserving heat, and then cooling to room temperature to obtain a reaction product; (3) filtering the obtained reaction product to obtain a red blocky crystal; (4) exchanging the red blocky crystal with methyl alcohol, and then vacuum heating at 220 DEG C for 5 to 7 hours, thus obtaining the metal-organic framework material. The metal-organic framework material is used for selective adsorption separation on CO2 in a gas mixture of CO and the CO2.

The invention provides a preparation method of a non-integer ratio graphene selenium cobalt nano sheet, belonging to the technical field of nano material preparation. The preparation method is characterized by comprising the following steps of: adding 0.1455g of cobaltous nitrate hexahydrate and 0.0866g of sodium selenite into a 25ml high-pressure reactor with a polytetrafluoroethylene liner, adding 20ml of ethylene glycol, stirring for 20min, closing the reactor, placing in a digital display temperature control furnace, and reacting for 24h at a temperature of 180 DEG C. A sample obtained with the preparation method is subjected to centrifugal washing three times and then dried to obtain a product. An organic template and a surfactant are not used in the invention, and the non-integer ratio graphene selenium cobalt nano sheet is synthesized with high yield,and is thin. The method has the advantages of simple preparation process and energy saving and is suitable for the industrialized production. The obtained non-integer ratio graphene selenium cobalt nano sheet has large specific surface area and strong adsorptive capacity to organic dye.

The invention provides a preparation method of a three-dimensional mesoporous NiCo2O4 / nitrogen-doped graphene composite electrode material. The preparation method comprises the following steps: step 1, implementing ultrasonic dispersion on graphene oxide in an acetonitrile system to obtain a uniform graphene oxide solution A; step 2, transferring the solution A to a polytetrafluoroethylene hydrothermal reactor to implement constant-temperature thermal reaction, and completing the reaction to obtain mixed liquid B; step 3, implementing extraction filtration, washing and drying on the mixed liquid B to obtain a product C; step 4, implementing uniform ultrasonic dispersion on the product C, cobalt nitrate hexahydrate, nickel nitrate hexahydrate and hexamethylenetetramine to obtain mixed liquid D; step 5, transferring the mixed liquid D to the polytetrafluoroethylene hydrothermal reactor to implement constant-temperature thermal reaction, and filtering and washing the liquid to obtain a nickel cobaltate precursor E; and step 6, putting the precursor E into a tubular furnace, and implementing calcination at an air atmosphere to obtain a reaction product namely the three-dimensional mesoporous NiCo2O4 / nitrogen-doped graphene composite electrode material. The preparation method provided by the invention is mild in reaction condition, easy to control, low in cost, and simple and convenient in process and procedure.

The invention discloses the preparation method of the sea-urchin-shaped cobalt acid copper nanometer material of a nickel foam load. In the method, cobalt nitrate hexahydrate, copper acetate monohydrate, ammonium fluoride and urea are used as raw materials, absolute ethyl alcohol and deionized water are used as a solvent, and through hydrothermal growth and a high temperature calcination method, the cobalt acid copper nanometer material possessing a sea urchin structure is prepared. By using the sea-urchin-shaped cobalt acid copper nanometer material of the nickel foam load prepared through using the method of the invention, especially when a calcination temperature is about 550 degree centigrade, the sea urchin shape of the acquired sea-urchin-shaped cobalt acid copper nanometer materialof the nickel foam load is uniform and ordered, and excellent electrochemistry performance and good multiplying power performance are achieved. The preparation technology is simple, the method is energy-saving and environmental-protection, the raw materials are cheap, time consuming is less and the method is easy for batch production. The sea-urchin-shaped cobalt acid copper nanometer material isapplied to a lithium ion battery cathode material and has the excellent electrochemistry performance.

The invention discloses a nanocomposite made of magnetic-metal-doped multiwalled carbon nanotubes / tin dioxide, and the nanocomposite can be widely applied to the aspect of electromagnetic wave absorption. A preparation method of the nanocomposite comprises the following steps: 1, conducting acidificaiton on multiwalled carbon nanotubes; 2, dispersing the acidified multiwalled carbon nanotubes treated in step 1 into water, obtaining dispersion liquid of the multiwalled carbon nanotubes, adding tin tetrachloride pentahydrate, then adding nickel nitrate hexahydrate or ferric nitrate nonahydrate or cobalt nitrate hexahydrate, then adding acid, then slowly adding stronger ammonia water, adjusting pH to be 7-10, conducting a reaction for 8-24 hours at the temperature of 120-180 DEG C, and obtaining the nanocomposite made of the magnetic-metal (M)-doped multiwalled carbon nanotubes / tin dioxide through aftertreatment, wherein M represents Fe, Co and Ni, and the massic volume ratio of the acidified multiwalled carbon nanotubes to the tin tetrachloride pentahydrate to the nickel nitrate hexahydrate or the ferric nitrate nonahydrate or the cobalt nitrate hexahydrate to the acid is 0.04 g: 1-4 g: 0.5-3 g: 0.5-4 mL.

The invention discloses a high-efficiency moisture-proof ozonolysis catalyst and a preparation method thereof, belonging to the technical field of ozone purification catalysts. According to the high-efficiency moisture-proof ozonolysis catalyst disclosed by the invention, the oxides of manganese, copper, nickel and cobalt are taken as active components; the preparation method of the high-efficiency moisture-proof ozonolysis catalyst is a sol-gel method; in the preparation process, manganese nitrate tetrahydrate, copper nitrate trihydrate, nickel nitrate hexahydrate and cobalt nitrate hexahydrate are dissolved in deionized water to obtain a nitrate solution; the nitrate solution is slowly added in a mixed solution of citric acid and a cationic surface active agent; after the pH value of the mixed solution is adjusted with ammonium hydroxide, constant temperature stirring is performed to obtain gel; and after the gel is dried, calcination is performed to obtain the ozonolysis catalyst. The preparation method disclosed by the invention is simple and low in costs, solves the problem that the ozonolysis catalyst is relatively poor in moisture-proof performance, and meanwhile, improves the ozonolysis efficiency; and the ozonolysis catalyst is long in service life, and the ozonolysis efficiency is not lowered when the ozonolysis catalyst is continuously used for a month.

The invention provides a low overpotential electrocatalyst for producing hydrogen by efficient water splitting and a preparation method of the electrocatalyst, and belongs to the technical field of catalyst preparation. The low overpotential electrocatalyst is prepared by in-situ growth of Co9Se8 on foamed nickel. The low overpotential electrocatalyst is prepared by one of cobalt nitrate hexahydrate, cobalt chloride, cobalt acetate or cobalt sulfate and one of sodium selenite pentahydrate, potassium selenite or seleninic acid in an organic amine environment in which the foamed nickel serves as a catalyst. The foamed nickel can serve as both a carrier and the catalyst of a synthetic reaction. The overpotential of the electrocatalyst is only -284mV when the electric current density is 80 mA / cm<-2> and is increased by more than 46.5% relative to that of pure foamed nickel with the overpotential of -530 mV when the electric current density is 80 mA / cm<-2>, and the electrocatalyst is a relatively low overpotential electrocatalyst in non noble metal electrocatalysts. The electrocatalyst is one of advanced technical means for the sustainable production of hydrogen energy, has good industrial application prospects and can be used to relieve an increasingly intense global energy supply pattern at present.

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.

The invention relates to an iron / cobalt duplex-metal organic framework material as well as a preparation method and application thereof. The preparation method comprises the steps: dissolving cobalt nitrate hexahydrate, iron dichloride tetrahydrate and terephthalic acid into N,N dimethyl formamide to obtain a precursor solution; performing hydrothermal reaction on the precursor solution for 14 to27 h under the temperature of 110 to 170 DEG C; cooling, washing and drying to obtain the iron / cobalt duplex-metal organic framework material. Duplex transition metal coordination sites which are highly dispersed in the prepared iron / cobalt duplex-metal organic framework material disclosed by the invention can enhance effective contact between the iron / cobalt duplex-metal organic framework material and persulfate and can efficiently catalyze the persulfate to generate sulfate radicals; thus, persistent organic pollutants in wastewater can be removed. The iron / cobalt duplex-metal organic framework material is suitable for treating varieties of organic wastewater and has the advantages of high activity, small use amount, wide application pH range, good durability, convenience in operation and environmental friendliness and wide prospect in treating toxic and harmful organic wastewater which is difficult to biodegrade.

The invention discloses a cobalt-based MOFs material. The cobalt-based MOFs material is formed by cobalt-nitrate hexahydrate which is reacted with terephthalic acid through a hydrothermal method, andthen is washed and dried through N, N-dimethyl formamide and an absolute ethyl alcohol solvent. A preparation method comprises the following steps: firstly, adding cobalt-nitrate hexahydrate in absolute ethyl alcohol, and performing magnetic stirring, so as to obtain a clear cobalt nitrate solution, adding terephthalic acid in N, N-dimethyl formamide, and performing magnetic stirring, so as to obtain clear a terephthalic acid solution, and performing mixed ultrasonic treatment on the two solutions; secondly, loading the solution subjected to mixed ultrasonic treatment into a reaction kettle, and arranging the reaction kettle into an oven, ensuring that the solution is reacted under a certain condition, and filtering, washing and drying a reaction product in certain condition after the reaction, so as to obtain the cobalt-based MOFs material. When the material is applied to the catalysis of hydrolysis of sodium borohydride, the hydrolysis speed reaches 1700 to 2400 mL min-1g-1, and thecatalytic performance keeps 47 to 50 percent of the original hydrogen yield after circulation. The material has excellent catalytic performance, and has a wide application prospect in the field of thepreparation of new energy resources.

The present invention relates to the super capacitor technology field, in particular to a method which uses the manganese nitrate tetrahydrate, the cobaltous nitrate hexahydrate, the glycerinum, the isopropyl alcohol and the graphene oxide as the raw materials to prepare the hollow CoMn2O4-RGO flexible super capacitor material, and is simple in preparation technology and low in cost. According to the present invention, by adopting the CoMn2O4 and GO materials of the hollow core-shell structures and by a vacuum filtration method, a CoMn2O4-RGO sandwich structure composite material is prepared for the first time, on one hand, the CoMn2O4 of the hollow core-shell structure has a larger specific area, and the hollow structure is more conducive to the permeation and transfer of an electrolyte; and on the other hand, a CoMn2O4 spherical structure also can support the intervals between the graphene layers, a channel for the flow of the electrolyte is provided, and the flow of the electrolyte in the interior of the material also can be accelerated. By the structure, the electrochemical performance of the material can be improved effectively.

The invention discloses a preparation method of vanadium nitride electrocatalyst and a product. The preparation method comprises the following steps: 1) fully mixing urea, ammonium metavanadate and cobalt-nitrate hexahydrate according to a formula ratio, and fully grinding to obtain reactant raw materials; 2) carrying out high-temperature reaction on the reactant raw materials prepared in step 1) under atmosphere protection at a reaction temperature of 700-900DEG C for 2-5h, removing impurities from powder obtained after cooling through diluted acid, washing lower-layer precipitates, drying the precipitates, and fully grinding to obtain the vanadium nitride electrocatalyst. The vanadium nitride electrocatalyst prepared with the preparation method disclosed by the invention has the characteristics of simple technical process, short reaction period, uniform material chemical composition, even morphology size, high electrocatalytic activity and stability and the like.

The invention discloses a preparation method of a three-dimensional layered structure Mn-doped CoP nanowire modified nanosheet array material (Mn-CoP NS@NW / NF) which is grown in situ on nickel foam. With cobalt-nitrate hexahydrate adopted as a cobalt source, manganese sulfate monohydrate adopted as a manganese source, ammonium fluoride and urea used to control the shape of the material, foamed nickel used as a substrate, a Mn-Co precursor can be prepared by using a hydrothermal method; and a low temperature preservation type phosphorization is carried out, so that the Mn-CoP NS@NW / NF can be synthesized. When being applied to a supercapacitor self-supporting electrode material, the Mn-CoP NS@NW / NF exhibits extremely high area specific capacitance (8.66 F cm<-2>) in 6 M KOH electrolyte, suchkind of performance of the Mn-CoP NS@NW / NF is much higher than that of an undoped CoP nanowire array material. On the basis of full utilization of the high specific surface area of a nano-array layered structure and the synergistic effects of various metals, the novel energy storage material has the advantages of high area ratio capacitance, long cycle life and low cost.

The invention discloses a method for manufacturing a graphene / two-dimensional Co-Zn dual-core metal frame structure composite material. The method comprises: adding an aqueous solution of zinc nitratehexahydrate to a 2-methylimidazole aqueous solution, mixing uniformly, stirring, and performing water centrifugal washing, and then freezing and drying to obtain a precursor two-dimensional organometallic frame structure material ZIF-8; then dispersing the precursor two-dimensional organometallic frame structure material ZIF-8 into an aqueous solution of graphene oxide, stirring at room temperature to make the precursor two-dimensional organometallic frame structure material ZIF-8 uniformly dispersed, adding cobalt nitrate hexahydrate, and then continuing to stir and performing centrifugal washing to obtain an intermediate product; performing low temperature pyrolysis on the intermediate product under a nitrogen atmosphere, to obtain a target product graphene / two-dimensional Co-Zn dual-core metal frame structure composite material. The composite material prepared by the method has uniform morphology, stable structure and good toughness, and the process is green and energy saving, andis efficient and simple, and easy for scale production.

The invention discloses a preparation method of a negative electrode material of a lithium-ion battery, and belongs to the technical field of lithium-ion batteries. The preparation method comprises the following steps: adding cobalt nitrate hexahydrate, nanometer silicon powder and 2-methylimidazole into a methanol solution respectively, then stirring with a magnetic stirrer and dispersing with anultrasonic generator for 30 minutes respectively, rapidly mixing the two solutions together, stirring at room temperature for 24 hours, and performing vacuum suction filtration and drying to obtain apurple black composite material; transferring the powder into a crucible for sintering, and naturally cooling to room temperature in order to obtain Co / N / C / Si composite powder with a porous structure. The Co / N / C / Si composite powder with the porous structure prepared by the method has the advantages of small particle size, uniformity, large specific surface area, high coating property of Si and the like. In a heat treatment process, the heating rate is low and the temperature preservation time is shorter, thereby ensuring that the particles are uniform and fine without excessive structural collapse.

The invention discloses preparation method and application of a cobalt-based sulfide nanosphere carbon fiber integrally comprising a core-shell structure. The preparation method comprises the steps offirstly, preparing cobalt precursor nanoparticle by taking cobalt nitrate hexahydrate as a cobalt source and glycerol-containing mixed alcohol as a solvent and by a solvothermal method; secondly, preparing polyproplylene (PAN)-coated cobalt precursor nanosphere by electrostatic spinning; and finally, preparing core-shell structure cobalt-based sulfide particle by high-temperature calcination andvulcanization, carbonizing an organic polymer to obtain the cobalt-based sulfide nanosphere carbon fiber integrally comprising the core-shell structure. By distribution of cobalt-based sulfide core-shell structure nanosphere in the carbon fiber, gradual and accurate control from a single sphere to multiple spheres can be achieved. The core-shell structure cobalt-based sulfide nanosphere carbon fiber is used as a lithium ion battery negative electrode material applied to a lithium ion battery, and the obtained lithium ion battery has favorable rate performance and excellent cycle stability.

The invention discloses a dye-sensitized solar cell counter electrode and a production method thereof. The production method thereof includes 1, dissolving cobalt nitrate hexahydrate and 2-methylimidazole with methyl alcohol, then mixing and stirring methanol solutions of the cobalt nitrate hexahydrate and 2-methylimidazole for 20-40 minutes before centrifuging the same, and obtaining ZIF (zeolite imidazole ester skeleton structure structure)-67 by separating, washing and drying the mixture; 2, roasting the ZIF-67 for 2 hs under 600-850 DEG C in the inert gas atmosphere; 3, dissolving the mixture obtained from the step 2 with isopropanol before subjecting the same to ball grinding for 6-8 hs to obtain particulate matters, and spraying and drying the particulate matters on the surface of FTO (fluorine-doped tin oxide) conductive glass. The production method thereof is easy to operate and low in cost, and the dye-sensitized solar cell is high in photoelectric converting efficiency.

The invention discloses melamine@ZIF-67 modified sponge oil absorption material as well as a preparation method thereof. The method adopts melamine sponge, dimethylimidazole and cobalt nitrate hexahydrate as raw materials, the melamine sponge is soaked in ZIF-67 precursor suspension to prepare low-density block-shaped MS@ZIF-67 sponge body oil absorption material. The melamine@ZIF-67 modified sponge oil absorption material is simple in process, low in cost and capable of being directly synthesized into a material with excellent performance in a one-step method. The melamine@ZIF-67 modified sponge oil absorption material has high porosity, low density, large surface area and high hydrophilic performance, can be floated on the water surface, has high oil absorption rate (the absorption ratefor diesel is 103 times) and is suitable for treating oil pollution of water.