169 results about "Cobalt sulfide" patented technology

The invention provides a carbon-coated cobalt sulfide material as well as a preparing method thereof and application of the carbon-coated cobalt sulfide material as a catalyst in the aspect of hydrogen production through the electric catalytic cracking of water and belongs to the fields of catalyst synthesis technologies and application. An organic matter rich in sulfur is used as a sulfur source and a carbon source, a cobalt salt is used as a cobalt source, the organic matter and the cobalt salt are forged in an inert atmosphere after being mechanically mixed uniformly, and the carbon-coated cobalt sulfide material can be obtained. The preparing method is simple and controllable, adopts cheap raw materials, has good sample repeatability, spends short time in the synthesis process, has low requirements on equipment and is suitable for massive production. As an active substance is effectively protected by a carbon coating layer from electrolyte corrosion, the electric conductivity of the material is improved, and accordingly, the material shows excellent hydrogen production electric catalysis performance in acid, neutral as well as alkaline electrolytes. The most important is that the development of the catalyst capable of being used in the whole pH range opens a novel path for the preparation of a cheap, efficient and environment-friendly non-noble metal electric catalysis material for hydrogen production.

The invention discloses an application method of binary metal sulfides in a chargeable magnesium battery. The binary metal sulfides comprise nickel sulfide, manganese sulfide, cobalt sulfide, ferric sulfide, tin sulfide, tungsten sulfide, zinc sulfide, vanadic sulfide and the like. The preparation method for preparing the chargeable magnesium battery with the binary metal sulfides as an anode material specifically comprises the steps of: grinding the binary metal sulfides; adding a conductive agent and a bonding agent into the binary metal sulfides, and agitating uniformly and coating on a current collector; placing the current collector in an oven to dry, punching into a pole piece by a punch, tabletting and placing into a vacuum oven to dry so as to obtain the anode material; and using magnesium as a cathode, adding an electrolyte and assembling the chargeable magnesium battery. The chargeable magnesium battery prepared by the method provided by the invention has the advantages of simpleness in preparation, abundance in materials, low cost, and easiness in mass production. The chargeable magnesium battery has a great advantage as a large energy storing battery and has a good application prospect as a green energy resource.

The invention belongs to the technical field of nanomaterials and electrochemistry and particularly relates to a preparation method of a zinc-cobalt sulfide/nitrogen-doped carbon composite material with a yolk-shell structure. The material can be used as a negative active material for a long-life and high-rate lithium-ion battery; the material has the yolk-shell structure of employing zinc-cobaltsulfide as a core and nitrogen-doped carbon as a shell and the size is 100-200nm, wherein the size of the zinc-cobalt sulfide is 80-100nm and the thickness of the carbon shell is 10-20nm. The zinc-cobalt sulfide/nitrogen-doped carbon composite material has the beneficial effects that the advantages of a metal-organic framework are utilized, a target product is obtained only through three steps ofprecursor preparation, carbon coating and vulcanization and calcination, the prepared material is high in productivity, good in stability and high in repeatability, and efforts are made for exploration of large-scale synthesized high-rate characteristic nanomaterials with excellent performance.

The invention discloses a preparation method of a cobalt nickel sulfide/foam nickel super capacitor electrode. According to the method, foam nickel, cobalt nitrate, nickel nitrate and thiocarbamide are used as raw materials; ammonium fluoride is used as an etching agent; polyvinylpyrrolidone is used as a morphology control agent; a hydrothermal reaction is performed in a hydrothermal reaction kettle at 100 to 180 DEG C for 2 to 8h; and nickel cobalt sulfide of an ultra-thin sheet layer-assembled cellular multi-stage structure deposits and grows on a foam nickel substrate, so that an active electrode is formed. The cobalt nickel sulfide electrode prepared by the preparation method provided by the invention can provide high pseudocapacitance, and has high electron and ion conductivity and excellent structure toughness at the same time, so that the specific capacitance and the rate capability of the capacitor can be comprehensively improved.

The invention relates to the technical field of electrocatalysts, and provides a preparation method of a cobalt sulfide doped nanoporous carbon electrocatalyst. The preparation method comprises the steps of mixing 2-aminoterephthalic acid, water-soluble aluminum salt and an organic solvent for the first time and then electrospinning to obtain a spun film; drying the spun film to obtain nitrogen-doped aluminum metal MOFs; mixing thiourea, water-soluble cobalt salt, an ethanol aqueous solution and n-hexane for the second time to obtain a mixed solution; carrying out two-phase interface coating on the nitrogen-doped aluminum metal MOFs and the mixed solution, and carrying out solid-liquid separation to obtain nitrogen-sulfur doped cobalt-aluminum bimetallic MOFs; pyrolyzing the nitrogen-sulfur doped cobalt-aluminum bimetallic MOFs in the N2 atmosphere to obtain the cobalt sulfide doped nanoporous carbon electrocatalyst. The cobalt sulfide doped nanoporous carbon electrocatalyst prepared by the method has excellent electrocatalytic activity and durability.

The invention discloses a zinc-cobalt sulfide/carbon nano negative electrode material and a preparation method thereof. The negative electrode material is of a hollow irregular spherical shell structure formed by distributing zinc-cobalt sulfide nano particles in a carbon matrix and on the surface of the carbon matrix, wherein the mass ratio of the zinc-cobalt sulfide to the carbon is (0.5 to 4.0): 1. The method comprises the steps of (1) adding a surfactant and 2-methylimidazole into an alcoholic solution, stirring, adding a zinc source alcoholic solution, stirring, standing and centrifuging;(2) dissolving in an alcoholic solution, adding a surfactant and 2-methylimidazole, stirring, adding a cobalt source alcoholic solution, stirring, carrying out solvothermal reaction, cooling, centrifuging, washing and drying; (3) adding trihydroxymethyl aminomethane into an alcoholic solution, stirring, adding dopamine hydrochloride, stirring, carrying out suction filtration, washing and drying;and (4) pre-roasting, cooling, mixing with sulfur powder, roasting and cooling. The material provided by the invention is excellent in electrochemical performance. The method provided by the inventionis mild, low in cost, environmentally friendly and suitable for industrial production.

The invention belongs to the technical field of the preparation of super capacitor materials, relating to a preparation method of a carbon nitride/cobalt sulfide two-dimensional sheet composite structure super capacitor electrode material. CoCl2-H2O and thiourea are weighed and placed in the beaker, anhydrous ethanol is added into the beaker, the magnetic stirring is carried out until complete dissolution, g-C3N4 is added, the ultrasonic processing is carried out until g-C3N4 is dispersed evenly, then ethylenediamine is added, an obtained dispersion solution is added into the reaction kettle of teflon, and the hydrothermal reaction is carried out. After natural cooling to a room temperature, the centrifugation, water washing and alcohol washing are carried out for many times, and after drying, a g-C3N4/CoS sample is obtained through grinding. The used CoS has stable chemical and physical properties, the original material is cheap and easy to obtain and is non-toxic, the reaction process of preparing the g-C3N4/CoS composite material is simple, the product production process is green and environment-friendly, and the capacitive property is excellent.

The invention provides a preparation method of a multifunctional molybdenum disulfide-cobalt sulfide-carbon in-situ composite electrode. According to the preparation method, molybdenum salts, cobalt salts, and carbon containing organic matters are dissolved in a volatile nonaqueous solvent; thiourea is taken as the sulfur source and is added into the solvent to obtain a Mo-Co-C-S precursor solution; the precursor solution is painted on a substrate, and then the substrate is dried and is placed in Ar or N2 air flow to carry out annealing and vulcanization. The preparation method has the advantages of low equipment requirements, cheap raw materials, easily controllable reaction conditions, simple production technology, good product uniformity, and little environmental pollution, and the prepared electrode can be used as a multifunctional electric catalyst for HER, OER, and ORR.

The invention discloses a metal oxide-sulfide composite oxygen evolution electrocatalyst, a preparation method and applications thereof, wherein the electrocatalyst is a composite material obtained bycoating zinc cobaltate nano-wires with nickel cobalt sulfide nano-sheets. According to the preparation method, zinc cobaltate nano-wires are synthesized by using a hydrothermal reaction, electrochemical deposition of sulfide nano-sheet is combined, and the zinc cobaltate nano-wires are coated with nickel cobalt sulfide nano-sheets so as to prepare the metal oxide-sulfide composite oxygen evolution electrocatalyst having a core-shell coating structure. According to the present invention, the prepared electrocatalyst has the specially designed chemical composition and the microstructure, such that the active sites and the surface area of the composite catalyst are improved, and the catalyst has high oxygen evolution activity and high stability are achieved compared with other oxide and sulfide electrocatalysts; the preparation method is simple and convenient; by using the low-cost non-precious metal raw materials, the large-scale synthesis of anode oxygen evolution catalysts required for water electrolysis reactions can be easily achieved; and the metal oxide-sulfide composite oxygen evolution electrocatalyst has good application prospect.

The invention provides a preparation method of an in-situ defect modified Co9S8-porous nitrogen-doped carbon electrode. The method comprises the steps of: dissolving cobalt salt, Tx-100, aniline and other carbon-containing organic matters in a volatile non-aqueous solvent, and adding thiourea as a sulfur source to obtain a Co-C-S precursor solution; and coating a carbon substrate with the precursor solution, performing drying and then annealing in Ar or N2 airflow to obtain an in-situ cobalt sulfide-carbon electrode, and continuously carrying out CVD calcination annealing on the in-situ cobaltsulfide electrode under dicyandiamide airflow to finally form the in-situ defect modified Co9S8-porous nitrogen-doped carbon electrode. The product obtained by the technical scheme provided by the invention has the advantages of the low equipment requirement, the low cost of required raw materials, the easily controlled reaction conditions, the simple production process, the good consistency of the formed product, the small environmental pollution and the like, and can be used for multifunctional electrocatalysts of OER and ORR.

The invention discloses a lamellar zinc-cobalt sulfide composite material based on MOFs, and a preparation method and an application thereof. The preparation method comprises the following steps: 1) synthesizing a white Zn MOFs nanosheet as a precursor; 2) adding white powder into an ethanol solution containing cobalt nitrate hexahydrate to obtain pinkish purple CO/Zn MOFs powder; and 3) performing two-step calcination and vulcanization on the pinkish purple powder in an inert atmosphere to obtain the ZnCoS@CNS composite material, namely, the lamellar zinc-cobalt sulfide composite material based on the MOFs. The ZnCoS@CNS composite material prepared by the method has a lamellar structure, so that the contact area of an electrolyte solution and the material can be enlarged, the transmissionof lithium ions is promoted, and meanwhile, a space is provided for the change of the volume of the material in a lithium intercalation/deintercalation process. When the material is used as a negative electrode material of a lithium ion battery, the material shows relatively good lithium storage performance.

The invention provides a preparation method of a dual-function cobalt sulfide and nitrogen-doped carbon composite array electrode. A chemical bath deposition method is adopted for preparing an alkalitype cobalt needle-shaped array in-situ electrode, after annealing is performed in air, a Co3O4 array is formed, and Co3O4 is annealed under the atmosphere of sulfur gas to form a CoS2 array. Then, dopamine is used for growing poly-dopamine on the surface of the Co3O4 or CoS2 array, then, an annealing reaction is performed under the protective atmosphere, poly-dopamine is converted into a nitrogen-doped carbon material in the reaction process, Co3O4 or CoS2 is converted into Co9S8-Co4S3 under the atmosphere of sulfur or inert gas. According to the product obtained through the technical scheme,due to the fact that the product has various high-electro-catalysis active loci including nitrogen-doped active loci in the carbon material and other lattice defects caused by the loci, and the excellent electro-catalysis oxygen reduction reaction (ORR) performance is achieved; the Co9S8-Co4S3 has the good electro-catalysis oxygen evolution reaction (OER) performance; in addition, the interface formed by Co9S8-Co4S3, the carbon material and the strong interface coupling effect has the excellent electro-catalysis OER and OER performance.

The invention discloses a porous cobalt sulfide and nitrogen-doped carbon composite material and a preparation method and application thereof. The composite material is mainly prepared from the following raw materials of a cobalt salt containing crystal water, o-phenylenedimine, o-vanillin and elemental sulfur. Compared with the prior art, the composite material obtained by the preparation method is used as a positive electrode material or a negative electrode material of a lithium ion battery, and excellent cycle stability and high rate performance are shown; and moreover, the preparation method does not need any solvent and is a green, simple and energy-saving preparation method for an electrode material.

The invention relates to a pseudo capacitor electrode based on a nickel/cobalt sulfide three-dimensional hierarchical nanostructure and a preparation method thereof. The electrode comprises a nickel foam substrate and multiple nickel/cobalt sulfide nanosheets located on the nickel foam substrate. The nickel/cobalt sulfide nanosheets are mutually connected and are honeycomb. Multiple nanoscale holes are distributed on each nickel/cobalt sulfide nanosheet. The preparation method comprises the steps of 1), preparing the foam nickel containing cobalt/nickel hydroxide nanosheets through a hydrothermal method, wherein the cobalt/nickel hydroxide nanosheets are located on the foam nickel, are mutually connected and are honeycomb; 2), processing the foam nickel containing cobalt/nickel hydroxide nanosheets obtained in the step 1) through a sulfidization method, thereby transforming the cobalt/nickel hydroxide nanosheets into cobalt/nickel sulfide nanosheets; and 3), constructing evenly distributed nanoscale holes on the nickel/cobalt sulfide nanosheets through an alkali solution etching method. The method is simple in technology and low in cost. The prepared electrode has the three-dimensional hierarchical nanostructure, very high specific capacitance, good rate capability and excellent cyclic stability.

The invention relates to a graphene/amorphous carbon nanotube/nickel-cobalt sulfide composite hybrid material and a preparation method of the graphene/amorphous carbon nanotube/nickel-cobalt sulfide composite hybrid material, and refers to a novel electromagnetic wave absorbing material with high reflectivity and wide absorption frequency band and a preparation method of the novel electromagneticwave absorbing material. The preparation method comprises the following steps: preparing a precursor from nickel sulfate, cobalt sulfate, trisodium citrate and urea as raw materials, then adding sodium sulfide to prepare nickel-cobalt sulfide, preparing a graphene oxide solution by an improved Hummers method, and preparing an amorphous carbon nanotube by a CVD method, finally mixing nickel-cobaltsulfide, the graphene oxide solution and the amorphous carbon nanotube, thereby being capable of obtaining graphene/amorphous carbon nanotube/nickel-cobalt sulfide composite hybrid material through ahydrothermal method. The composite material prepared by the invention has the advantages of sandwich structure, large specific surface area, high electrical conductivity and the like, and can make theabsorbing material have the characteristics of high reflectivity, wide absorption frequency band and the like and greatly improves the absorbing properties of the material.

The invention discloses a cobalt-nickel-nitrogen sulfide-doped carbon nanofiber composite rich in sulfur vacancies and a preparation method thereof. The preparation method of the composite comprises the steps of pre-oxidizing a polyacrylonitrile nanofiber membrane obtained by electrostatic spinning and then carbonizing the polyacrylonitrile nanofiber membrane at the high temperature to obtain a nitrogen-doped carbon material; enabling Ni-Co precursor nanowires to grow in situ with the nitrogen-doped carbon material as a carrier; adopting an annealing process for obtaining a cobalt-nickel-nitrogen oxide-doped carbon nanofiber composite, and obtaining the cobalt-nickel-nitrogen sulfide-doped carbon nanofiber composite rich in sulfur vacancies through further vulcanization and annealing treatment. The composite prepared by means of the method has the advantages of uniform structure and appearance, high-conductivity nitrogen-doped carbon nanofibers are used as a substrate, a sulfur vacancy-doped cobalt-nickel sulfide uniformly grows outside the hollow nitrogen-doped carbon material, the agglomeration problem of cobalt-nickel sulfides is avoided, and the composite has the advantages oflarge specific surface area, high conductivity, stable physical and chemical properties, excellent electrochemical performance and the like.

The invention provides a preparation method for electro-deposited nickel and cobalt. According to the preparation method, ferrous sulfate or iron pyrite or zinc sulfide or nickel-cobalt sulfide serves as a reducing agent, and nickel-cobalt hydroxide is soaked completely through one step; then neutralizing and deironing are conducted through the nickel-cobalt hydroxide, silicon and aluminum are removed through neutralization by means of magnesium oxide, leaching residues are washed for recycling nickel and cobalt, P2O4/5O7 is removed out of a filtered solution, and saponification, extraction and impurity removal are conducted; and nickel is deposited by means of the P2O4/507 through electro-deposited nickel anolyte and industrial grade light-roasted powder or magnesium oxide, nickel hydroxide directly reacts with P2O4 or P5O7 for producing nickel soaps, and a P5O7/2O4 extraction solution is used for conducting electrodeposition on nickel or cobalt or conducting evaporative crystallization for producing the electro-deposited nickel or electro-deposited cobalt. A back extraction solution is used for producing manganese sulfate monohydrate and electro-deposited zinc. An anolyte nickel deposition post-solution is used for producing magnesium sulfate heptahydrate through evaporation. By the adoption of the preparation method, the P2O4 nickel soaps and the P5O7 soaps which meet scale production can be obtained, the production cost of the electro-deposited nickel and cobalt is substantially reduced, the problem that anolyte volume expansion is solved, and corrosion of anolyte evaporation to equipment is eradicated; and zero emission of production waste water of the electro-deposited nickel and cobalt is achieved, and environment protection and comprehensive resource utilization are facilitated.

The invention relates to a lithium sulfur battery cathode material and a preparation method thereof and belongs to the technical field of lithium sulfur batteries. The lithium sulfur battery cathode material comprises a sulfur-containing active cathode material, a conductive additive, a binding agent and a sulfur carrier, wherein the sulfur carrier is porous basic manganese oxide, a graphene-basicmanganese oxide composite or a graphene-basic manganese oxide-cobalt sulfide composite. The sulfur carrier is good in conductivity and dispersibility, capable of favorably bonding with an intermediate product of sulfur and a lithium-sulfur battery, good in processability and easy to coat to form a lithium ion battery electrode. The synthesis method is simple in process operation, environment-friendly, free of calcination and low in energy consumption and has an industrialized prospect.

The invention belongs to the technical field of capacitor materials, and particularly relates to a nickel hydroxide/cobalt disulfide composite material and a preparation method and application thereof. The preparation method of the nickel hydroxide/cobalt disulfide composite material comprises the following steps: providing carbon cloth, and growing a cobalt-based metal organic framework materialon the surface of the carbon cloth; putting the carbon cloth on which the cobalt-based metal organic framework material grows into an alcoholic solution containing a sulfur source, and carrying out heating treatment to generate cobalt disulfide nanorods on the surface of the carbon cloth; and then depositing nickel hydroxide on the surface of the cobalt disulfide nanorod, and obtaining the nickelhydroxide/cobalt disulfide composite material. The nickel hydroxide/cobalt disulfide composite material obtained by the preparation method has very good electrochemical performance and flexibility, and has relatively high energy density, long cycle performance and very good flexibility when being used as an electrode material in a flexible supercapacitor, so that the nickel hydroxide/cobalt disulfide composite material has very good application value.

The invention discloses cobalt disulfide-tin disulfide composite particles and a preparation method and application thereof. The preparation method of the cobalt disulfide-tin disulfide composite particles comprises the following steps: 1) dispersing a soluble cobalt salt and 2-methylimidazole in a solvent, and fully reacting to obtain a zeolite imidazolate framework structure material; 2) uniformly mixing the zeolite imidazate skeleton structure material and sulfur powder, putting the mixture into a protective atmosphere, and heating for vulcanization to obtain cobalt disulfide particles; 3)dispersing cobalt disulfide particles in a solvent, adding soluble tin salt and thioacetamide, and carrying out solvothermal reaction. The cobalt disulfide-tin disulfide composite particles are prepared into the sodium ion battery negative electrode material, and the sodium ion battery negative electrode material is assembled into the sodium ion battery. The cobalt disulfide-tin disulfide composite particle is good in conductivity and simple in preparation process, and when the cobalt disulfide-tin disulfide composite particle is used as a negative electrode material of a sodium-ion battery, the mobility of sodium ions is high, and the volume expansion in the charging and discharging process is small.