18 results about "Cobaltous sulfide" patented technology

The invention discloses a foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoS / NiS. The foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoS / NiS is prepared by the following steps: firstly, taking foamed nickel NF as a substrate, loading cobalt hydroxide on the surface of the NF through first electrodeposition, then converting the NF into ZIF-67 through an impregnation method, then vulcanizing through thioacetamide and hydrothermal reaction, and finally loading Ni3S2 nanoparticles through second electrodeposition. The nickel foam loaded cobalt sulfide / nickel sulfide NF-CoS / NiS can be obtained. The preparation method comprises the following steps: 1, preparing foamed nickel electro-deposition cobalt hydroxide; 2, preparation of the foamed nickel loaded cobalt hydroxide / ZIF-67; 3, cobalt hydroxide / cobalt sulfide NF-Co / CoS is loaded on the foamed nickel; and 4, preparation of the foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoSX / Ni3S2. When the material is used as a supercapacitor material, charging and discharging are carried out in a voltage window range of 0-0.5 V, and when the current density is 1mA cm <-2 >, the area specific capacitance is 8-9F cm <-2 >; and when the current density is 10mA cm <-2 >, 70-80% of the initial capacity is still kept after 5000 charge-discharge cycles are carried out.

The invention provides a method for comprehensively recovering lithium and cobalt from a waste lithium cobalt oxide battery positive electrode material, which comprises the following steps: (1) pretreating the waste lithium cobalt oxide battery positive electrode material to obtain a lithium cobalt oxide positive electrode active material; uniformly mixing the lithium cobalt oxide positive active material with a sulfenyl compound and a carbon source to obtain a mixture; the mixture is subjected to inert atmosphere roasting, grinding, leaching and filtering in sequence, and a lithium-containing solution and sulfur-containing filter residues are obtained; (2) carrying out acid leaching impurity removal on the sulfur-containing filter residues, and filtering to obtain cobalt sulfide residues; (3) roasting the cobalt sulfide slag in an oxygen atmosphere to obtain a roasted product; and (4) the roasted product is leached and filtered, and a cobalt sulfate solution and cobaltosic oxide are obtained. According to the method, soluble sulfate and high-purity cobalt oxide can be obtained, and the method is short in process, low in cost and high in lithium selectivity.

This invention discloses a method for preparing cobalt-manganese sulfide nanosheets@cobalt-copper sulfide nanowire arrays / nickel foam as a supercapacitor electrode material. The purpose of this invention is to design a core-shell structure composed of different components to improve the specific capacity and cycle performance of the electrode material. This invention mainly includes: 1. Hydrothermal preparation of cobalt-copper precursor / nickel foam (CoCu-pre / NF); 2. Hydrothermal sulfidation preparation of cobalt-copper sulfide nanosheet arrays / nickel foam (CuCo2S4 / NF); 3. Hydrothermal preparation of cobalt-manganese sulfide nanosheets@cobalt-copper sulfide nanowire arrays / nickel foam (MnCoS@CuCo2S4 / NF). This invention features a simple synthesis process, low cost, high yield, and no need for subsequent processing. The MnCoS@CuCo2S4 heterostructure exhibits stronger OH... ‑ The MnCoS@CuCo2S4 / NF electrode exhibits high capture capacity and excellent conductivity, thereby enhancing the efficiency of rapid redox processes. At 1 A g... ‑1 At that time, it obtained 1141.2 C g. ‑1 The specific capacitance at 10 A g ‑1 It exhibits excellent cycling performance of 90.7% over 10,000 cycles. (740.47 W kg) ‑1 At a power density of 64.38 Wh / kg, the hybrid supercapacitor (HSC) can provide 64.38 Wh / kg. ‑1 The electrode exhibits high energy density and can successfully light up LED bulbs. It has enormous application potential as a high-performance electrode material for supercapacitors.

The invention discloses an electrochemical sensor for simultaneously detecting dopamine and uric acid and a preparation method thereof, and the method comprises the following steps: a, forming a basic working electrode, a counter electrode and a reference electrode on a substrate, and preparing a three-dimensional titanium nitride-reduced graphene oxide porous aerogel electrode on the basic working electrode; and b, synthesizing a titanium nitride-reduced graphene oxide-cobalt sulfide electrode on the basis of the porous aerogel electrode, and taking the titanium nitride-reduced graphene oxide-cobalt sulfide electrode as a working electrode to complete the preparation of the electrochemical sensor. According to the electrochemical sensor, a three-electrode system is adopted, a carbon electrode serves as a counter electrode, Ag / AgCl serves as a reference electrode, a titanium nitride-reduced graphene oxide composite nanostructure is adopted for modifying a working electrode, and cobalt sulfide is prepared through electro-deposition so as to enhance the detection performance. The method is high in sensitivity, low in cost, easy to operate and suitable for medical diagnosis, biomedical research and personal health monitoring.

The application relates to a porous carbon-coated cobalt sulfide nanosheet catalyst and a preparation method and application thereof, and belongs to the field of electrocatalytic materials and renewable energy technologies. The application constructs a composite nanosheet structure of Co9S8 nanoparticles embedded in a porous carbon matrix, so as to solve the problems of insufficient activity and stability of a bifunctional oxygen catalyst. The preparation method comprises the following steps: 1, preparing hexagonal alpha-Co(OH)2 nanosheets; 2, preparing a uniformly dispersed alpha-Co(OH)2 nanosheet loaded surfactant micelle template solution; 3, preparing a mesoporous melamine resin coated alpha-Co(OH)2 nanosheet composite; and 4, placing the mesoporous melamine resin coated alpha-Co(OH)2 nanosheet composite obtained in the step 3 and a sulfur source in a tube furnace respectively, and carrying out two-step high-temperature treatment under a protective atmosphere, so that the catalyst is obtained. The catalyst shows excellent bifunctional oxygen catalytic activity in an alkaline medium: the overpotential of an oxygen evolution reaction is as low as 324 mV (10 mA cm ‑2 ), and the starting potential of an oxygen reduction reaction reaches 0.92 V.

The invention relates to the technical field of new energy, and discloses a CoSC composite modified nickel foam film efficient electrode material, which comprises a nickel foam substrate, a graphene layer coated on the surface of the nickel foam substrate, a phase change material loaded between the graphene layer and the nickel foam substrate, and titanium particles dispersed in the composite material, the graphene layer completely coats the skeleton surface of the nickel foam substrate to form a three-dimensional through network structure. Through the synergistic compatibility design of the cobalt sulfide-carbon nanotube composite power generation material, the phase change material and the titanium particles, the function complementation advantages of all the components are fully played, the cobalt sulfide-carbon nanotube composite power generation material can enhance the electrocatalytic activity and the energy conversion efficiency, the phase change material achieves efficient regulation and control of heat, and the titanium particles guarantee that the material structure is stable; the three components cooperate with the nickel foam substrate, so that the problems of insufficient energy conversion efficiency and poor operation stability of a traditional nickel-based electrode material are effectively solved.

The electrode comprises a porous cobalt sulfide active layer which takes three-dimensional foamed nickel as a conductive framework and is formed by in-situ growth on the surface of the conductive framework, and the porous cobalt sulfide active layer and the conductive framework form an integrated self-supporting structure. The method sequentially comprises the steps of pretreatment of three-dimensional foamed nickel, in-situ synthesis of a metal organic framework precursor, formation of porous cobaltosic oxide through calcination and preparation of porous cobalt sulfide through ion exchange, and the obtained electrode does not need to use a binder or a conductive agent, and has high conductivity, large specific surface area and excellent ion transmission performance; and the multiplying power characteristic and the cycling stability of the electrode can be effectively improved. The structure is simple, the process is controllable, the cost is low, and the method is suitable for preparing high-performance super capacitors and flexible energy storage devices.

The invention provides a composite electrode material and a preparation method thereof, an anode electrode and a fuel cell, the composite electrode material comprises: an yttrium oxide-zirconium oxide carrier having a porous structure, the surface of the yttrium oxide-zirconium oxide carrier being divided into a pore inner surface and a pore outer surface, the yttrium oxide-zirconium oxide carrier being used as a structural skeleton of the composite electrode material; the cobalt sulfide coating layer is coated on the outer surface of the yttrium oxide-zirconium oxide carrier. The electrode material prepared by the method has better catalytic activity, the catalytic performance of the electrode material can be further improved, and the preparation method is simple to operate, mild in reaction condition and suitable for large-scale production.

The present invention discloses a cathode material for a sulfur battery containing a graphene oxide composite and a preparation method thereof, which relates to the technical field of preparation of electrode materials; the cathode material for the sulfur battery containing the graphene oxide composite is composed of a host material loaded with selenium-doped cobalt sulfide, graphene oxide modified with polydopamine, and a zinc-based metal-organic framework composite coating material; after the host material loaded with Co nanoparticles is sulfided and selenized, the graphene oxide modified with polydopamine and the zinc-based metal-organic framework composite coating material form a coating layer on the surface of the host material loaded with selenium-doped cobalt sulfide, further enhancing the conductivity of the cathode material for the sulfur battery, improving the adsorption capacity and utilization rate of polysulfides, and at the same time providing sufficient buffer space for volume expansion, significantly enhancing the battery performance and cycle stability.

A cobalt disulfide / boron, nitrogen, and sulfur co-doped porous carbon composite material, its preparation method, and application are described. A colloidal precursor is prepared by mixing the metal-organic framework material ZIF-67, a nitrogen-containing carbon source, a boron source, and a confined solvent. The resulting precursor is subjected to high-temperature confined carbonization and then sulfurization to obtain a composite material composed of fine CoS2 nanoparticles dispersed in a boron, nitrogen, and sulfur co-doped porous carbon matrix. The composite material's large specific surface area enhances electrolyte wetting and penetration; the nanostructured porous carbon and CoS2 effectively shorten charge transfer distances and enhance electrochemical reaction kinetics; and the boron, nitrogen, and sulfur co-doped carbon matrix provides a richer set of electrochemical reaction active sites. Its abundant porous interconnected structure facilitates charge migration, mitigates volume changes in the electrode material during charge and discharge, and improves the electrochemical stability of the electrode material. This composite material can be used as an excellent anode material for sodium-ion batteries.

The invention discloses a sulfur battery positive electrode material containing a graphene oxide compound and a preparation method of the sulfur battery positive electrode material, and relates to the technical field of electrode material preparation. The sulfur battery positive electrode material containing the graphene oxide compound is prepared from a host material-loaded selenium-doped cobalt sulfide, polydopamine-modified graphene oxide and a zinc-based organic framework composite coating material, after a host material loaded with Co nanoparticles is subjected to sulfuration and selenylation, a polydopamine modified graphene oxide and zinc-based organic framework composite coating material forms a coating layer on the surface, loaded with selenium-doped cobalt sulfide, of the host material, so that the conductivity of the sulfur battery positive electrode material is further enhanced; the adsorption capacity and the utilization rate of polysulfide are improved, meanwhile, a sufficient buffer space is provided for volume expansion, and the performance and the cycling stability of the battery are remarkably enhanced.

The invention discloses a nitrogen-doped cobalt disulfide porous carbon nanotube as well as a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. Porous carbon nanotube packaging metal ions are prepared through electrostatic spinning, pore structures are generated on the surface and inside of carbon fibers through nitrogen-doped heat treatment, and the nitrogen-doped cobalt disulfide porous carbon nanotubes are obtained through vulcanization treatment. The porous structure can buffer the volume change caused by the reaction of the metal sulfide and sodium ions, the strong conductivity of the carbon fiber provides an effective electron transmission path for electron transfer, the metal sulfide improves the electrochemical performance, the porous structure of the material provides more active sites, and the sodium storage performance of the battery is improved. Therefore, the invention provides the sodium ion battery negative electrode material with high stability and high conductivity.

This invention discloses a method for preparing a molybdenum-doped basic cobalt carbonate nanosheets@cobalt sulfide nanosheet array / nickel foam composite material as a supercapacitor electrode material. The purpose of this invention is to carefully design a core-shell structure composed of different components to improve the specific capacity and cycle performance of the electrode material. This invention mainly includes: 1. Hydrothermal synthesis to prepare cobalt-metal-organic framework / nickel foam (Co-MOF / NF); 2. Hydrothermal sulfidation to prepare cobalt sulfide nanosheet array / nickel foam (Co3S4 / NF); 3. Hydrothermal preparation of molybdenum-doped basic cobalt carbonate nanosheets@cobalt sulfide nanosheet array / nickel foam (Mo-CCH@Co3S4 / NF). This invention features a simple synthesis process, low cost, high yield, and no need for subsequent processing. The Mo-CCH@Co3S4 / NF heterostructure exhibits excellent electrical conductivity and stronger OH- ions. ‑ The Mo-CCH@Co3S4 / NF electrode exhibits enhanced capture capability, thereby improving the efficiency of rapid redox processes. At 1 A g... ‑1 It was 1816.2 C g at that time. ‑1 The specific capacitance at 10 A g ‑1 It exhibits excellent cycling performance of 87.5% over 10,000 cycles.

The application discloses a preparation method of nickel sulfide / cobalt sulfide for a nickel-zinc battery based on sulfur vacancy enrichment, and is specifically implemented according to the following steps: step 1, preparing Ni-doped Co5(O 9.48 H 8.52 )NO3 nanosheet material; step 2, preparing Ni3S2 / Co3S4 nanosheet heterojunction material; and step 3, preparing Ni3S2 / Co3S4 nanosheet heterojunction material with sulfur vacancy enrichment. The positive electrode material is green and environment-friendly, has high specific surface area and high electrical conductivity, and has high power density and area specific capacity compared with other positive electrode materials of an alkaline Ni-Zn battery.

The invention provides a three-dimensional flexible self-supporting carbon cloth-nickel-cobalt sulfide hollow nano-porous cage lithium ion battery electrode which is composed of carbon cloth, a metal nickel layer and cobalt sulfide, the metal nickel layer is a current collecting layer formed by wrapping the surface of the carbon cloth through electro-deposition, the carbon cloth is wrapped by the metal nickel layer, and the cobalt sulfide layer is a current collecting layer formed by wrapping the metal nickel layer on the surface of the carbon cloth. And cobalt sulfide forms a cobalt sulfide layer with a porous cage structure on the surface of the carbon cloth wrapped by the nickel layer. The invention also provides a preparation method of the three-dimensional flexible self-supporting carbon cloth-nickel-cobalt sulfide hollow nano porous cage lithium ion battery electrode. The production process of the negative electrode of the lithium ion battery can be simplified, the active components are prevented from falling off in the charging and discharging process of the lithium ion battery, and the first coulombic efficiency, the cycle performance and the rate capability of the negative electrode of the lithium ion battery are effectively improved.

The present application belongs to the technical field of hydrogen production device and its supporting catalyst, and particularly relates to a novel hydrogenation catalyst and a preparation method thereof. The novel hydrogenation catalyst is characterized in that: the active component is molybdenum sulfide and molybdenum oxide, wherein the content of molybdenum sulfide accounts for 6-10% of the mass of the catalyst, the content of molybdenum oxide accounts for 2-8% of the mass of the catalyst; the content of cobalt sulfide accounts for 1-3% of the mass of the catalyst; the content of nickel sulfide accounts for 1.5-5% of the mass of the catalyst; and the remaining component of the catalyst is a composite carrier. The present application provides a novel hydrogenation catalyst, which has the advantages of sulfur-free, high activity, no sulfur release and environmental friendliness, and is suitable for processing of hydrocarbon steam hydrogen production raw materials and provides a preparation method of the novel hydrogenation catalyst.

The application discloses application of a sulfur-defect-rich cerium monatomic doped cobalt sulfide nanomaterial in catalytic degradation of antibiotics. 4‑x As an electron transfer station, the sulfur vacancy defect in the nanocatalyst induces stronger electron-vibration coupling, captures and promotes the active site to induce PMS to give a high redox potential; when the antibiotic with rich electrons approaches the PMS molecule activated by the catalyst, a ternary system of electron donor-mediator-receptor is formed, electrons are directly taken from the antibiotic to induce oxidation, and the chain reaction is initiated by the breakage of the peroxide bond in the PMS molecule, so that the antibiotic is oxidatively degraded. The application can realize almost 100% removal rate of tetracycline within 10 minutes and almost 100% removal rate of sulfamethoxazole within 15 minutes.

The invention relates to the technical field of batteries, and discloses a modified high-nickel positive electrode material and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing a cobalt salt, an organic ligand and a solvent to obtain an MOF precursor solution; (2) dispersing a high-nickel positive electrode material in the MOF precursor solution for reaction to obtain an intermediate product; and (3) carrying out solid-phase mixing on the intermediate product and a sulfur source, and carrying out heat treatment to obtain the modified high-nickel positive electrode material, the modified high-nickel positive electrode material comprises a high-nickel positive electrode material and a composite coating layer, wherein the composite coating layer comprises cobalt sulfide and a carbon material. According to the preparation method provided by the invention, the MOF material is grown in situ on the high-nickel positive electrode material, and then the sulfur source is used for vulcanization, so that the uniform and compact composite coating layer which is firmly combined with the matrix on the nanoscale is formed on the surface of the positive electrode material, the interface stability, the thermal stability and the conductivity of the material are improved, and the electrochemical performance of the battery material is further improved.