58results about How to "The experimental design is ingenious" patented technology

The invention belongs to the technical field of transition metal sulfides, namely carbon materials, and particularly discloses a nickel cobalt sulfide/graphene/carbon nanotube composite material and a preparation method and an application thereof. The method comprises the following preparation processes: mixing graphene oxide with a carbon nanotube, and preparing a graphene oxide/carbon nanotube hybrid material through ultrasound; and carrying out in-situ growth of a nickel cobalt sulfide nanosheet on the graphene oxide/carbon nanotube hybrid material through a one-step hydrothermal process. The graphene oxide/carbon nanotube hybrid material prepared by the method has the advantages of a three-dimension porous space structure, excellent conductivity, large specific surface area, stable chemical property and the like; the final nickel cobalt sulfide/graphene/carbon nanotube composite material is controllable in morphology; the nickel cobalt sulfide nanosheet evenly grows on the graphene oxide/carbon nanotube hybrid material; and a unique base structure and high specific surface area of the graphene oxide/carbon nanotube hybrid material are fully utilized. The material disclosed by the invention can be used as an ideal high-performance electric catalytic material, and an electrode material for new energy devices of a lithium-ion battery, a super capacitor and the like.

The invention belongs to the technical field of transitional-metal sulfide-carbon materials, and concretely relates to a phosphorus-doped nickel cobalt sulfide/carbon nanotube-carbon nanofiber composite material and a preparation method thereof. The preparation method comprises preparing carbon nanotube-doped carbon nanofiber through electrostatic spinning and high-temperature carbonization, then growing nickel cobalt sulfide nanorod in situ through a hydrothermal process, and finally calcining a phosphorus-containing precursor at a high temperature in an atmosphere of an inert gas, so as to prepare the phosphorus-doped composite material. The prepared carbon nanofiber possesses relatively large specific surface area, and the electric conductivity is effectively enhanced by doping carbon nanotube. By taking the carbon naofiber as a substrate, nickel cobalt sulfide nanorod uniformly densely grows on the surface of the composite fiber, and the synergistic effect of various substances is fully displayed. By doping phosphorus, the electrochemical activity of the composite material is further improved. The prepared phosphorus-doped nickel cobalt sulfide/carbon nanotube-carbon nanofiber composite material is applicable as a high-performance electro-catalytic material and an electrode material of lithium ion battery, solar cells and other new-energy-source devices.

The invention belongs to the technical field of nanomaterial, and specifically discloses a nickel sulfide nanoparticle/nitrogen-doped fiber-based carbon aerogel composite material and a preparation method therefor. The composite material is prepared by the steps of adopting nickel salt and a sulfur source, and performing in-situ growth of the nickel sulfide nanoparticles on the nitrogen-doped cellulose-based carbon aerogel; the raw materials comprise a biomass material rich in fibers, nickel salt, thiocarbamide, dopamine and aniline monomer; the preparation process comprises the steps of preparing a poly-dopamine-coated fiber-based biomass material or a polyaniline-coated cellulose-based biomass material through a one-step polymerization method; preparing the nitrogen-doped cellulose-based carbon aerogel through a high temperature carbonization method; and performing in-situ growth of the nickel sulfide nanoparticles on the surface of the nitrogen-doped fiber-based carbon aerogel by adopting a one-step solvothermal method. The composite material prepared by the invention has the uniform distribution characteristic of the nickel sulfide nanoparticles on the nitrogen-doped fiber-based carbon aerogel, so that the composite material can be used as the ideal supercapacitor electrode material.

The present invention relates to a molybdenum selenide sulfide/carbon nanotube composite material, preparation and application thereof. According to the molybdenum selenide sulfide/carbon nanotube composite material, molybdenum selenide sulfide nanosheets uniformly wrap a carbon nanotube. Preparation of the composite material includes the following steps of performing mixed acid treatment on the carbon nanotube; then in-site growing molybdenum selenide on the carbon nanotube by using a solvothermal method so as to obtain a molybdenum selenide-carbon nanotube composite material; and doping sulphur in molybdenum selenide nanosheets through a high temperature replacement reaction so as to obtain the molybdenum selenide sulfide/carbon nanotube composite material. The composite material can be used in an electrocatalytic water decomposition device, a lithium ion battery, and a super capacitor. The molybdenum selenide and the carbon nanotube are compounded effectively, so that a good synergistic effect of the molybdenum selenide and the carbon nanotube can be achieved. The electronic structure is adjusted and controlled by doping sulphur. The prepared molybdenum selenide sulfide/carbon nanotube composite material has excellent electrochemical performance.

The invention relates to a ZIF-8 pyrolysis porous carbon-graphene composite material, a manufacturing method and an application thereof. The structure of the composite material is characterized in that graphene is wrapped on a surface of ZIF-8 pyrolysis porous carbon. The manufacturing method comprises the following steps of mixing zinc nitrate hexahydrate and 2-methylimidazole and dissolving in a solvent; standing for 1-2hs and acquiring a milk-shape solution; centrifuging, washing, carrying out vacuum drying and acquiring ZIF-8 crystal; and mixing the ZIF-8 crystal and potassium citrate, grinding, carrying out high temperature carbonization and acid pickling, drying and acquiring the material. The manufacturing method is simple and cost is low. The acquired ZIF-8 pyrolysis porous carbon-graphene composite material possesses advantages that a chemical property is stable, a capacitive character is good, a specific surface area is high and so on. A hierarchical pore and a three-dimensional conducting framework are fully used to increase electrochemical performance. Under a 1A/g current density, a specific capacitance reaches 300F/g. The material is an ideal high performance electrode material of a super capacitor.

The invention belongs to the technical field of a transition element sulfur group compound-carbon material and particularly relates to a nickel selenide/graphene/carbon nanotube composite material and a preparation method thereof. A preparation process comprises the following steps: preparing graphene oxide/acidified nanotube aerogel through liquid nitrogen quenching and freezing and drying; carrying out high-temperature carbonization and reduction to obtain graphene/nanotube aerogel; carrying out in-situ growth on the aerogel through chemical bath disposition to obtain a nickel hydroxide nano-sheet; and finally, carrying out selenization treatment. The graphene/carbon nanotube aerogel prepared by the invention has stable chemical properties and good conductivity; finally, the prepared composite material has a controllable shape; nickel selenide nano-particles are uniformly loaded on the graphene/nanotube aerogel, and a unique three-dimensional porous structure and a high specific surface area of the graphene/nanotube aerogel are sufficiently utilized; and the composite material can be used as an ideal high-performance electro-catalytic material and an electrode material of new energy source devices including sodium-ion batteries, super-capacitors and the like.

The present invention belongs to the technical field of transition metal sulfur group compound-carbon materials, and in particular relates to a molybdenum selenide/porous carbon nanofiber composite material and a preparation method and application thereof. The preparation process is as follows: porous carbon nanofiber is obtained by electrostatic spinning and high temperature carbonization of polystyrene as a pore-forming agent, and a one-step hydrothermal method is used for situ growth of molybdenum selenide nano chips on the porous carbon nanofiber. The prepared porous carbon nanofiber has the advantages of large specific surface area, chemical stability, good conductivity, excellent mechanical properties, and the like, the prepared molybdenum selenide/porous carbon nanofiber composite material is controllable in morphology, the molybdenum selenide nano chips are uniformly grown on the carbon nanofiber, and a unique base structure and a high specific surface area of the porous carbon nanofiber are fully used. The molybdenum selenide/porous carbon nanofiber composite material can be used as an ideal high-performance electro-catalytic material and an electrode material of lithium-ion batteries and solar cells and other new energy devices.

The invention belongs to the technical field of transition-metal chalcogenide-carbon material and specifically relates to a nickel selenide/hollow carbon-fibre composite and a preparation method thereof. The preparation process comprises the following steps: preparing hollow carbon fiber by the use of high-temperature carbonized cotton, then growing vertical nickel hydroxide nanosheet in situ on the hollow carbon fiber by a chemical bath deposition method, and finally selenizing the obtained nickel hydroxide/hollow carbon fiber composite so as to prepare the nickel selenide/hollow carbon-fibre composite. The prepared carbon fiber is a hollow structure and has large specific surface area and good conductivity. The preparation process is simple, and cost is low. The morphology of the finally prepared nickel selenide/hollow carbon-fibre composite is controllable. Nickel selenide uniformly grows on the internal and external tube walls of the hollow carbon nanofiber. By full utilization of the unique hollow tube structure and high specific surface area of the hollow carbon fiber, the product can be used as an ideal high-performance electrocatalysis material as well as an electrode material of new energy devices such as a sodium-ion battery and a supercapacitor, etc.

The invention belongs to the technical field of transition metal sulfide/carbon materials, and particularly discloses a cobalt zinc sulfide/graphene/carbon nanofiber composite material and a preparing method thereof. The preparing method includes the steps that a polyacrylonitrile nanofiber film is prepared through electrostatic spinning, polyacrylonitrile nanofibers are wrapped by graphene oxide with a solution soaking method, then a graphene/carbon nanofiber composite film is prepared through high temperature carbonization, and cobalt zinc sulfide nanometer particles grow on the graphene/carbon nanofibers with a one-step hydrothermal method in an in-situ mode. The prepared cobalt zinc sulfide/graphene/carbon nanofiber composite material is controllable in morphology, has the high specific surface area and the good electrical conductivity, and can serve as an ideal high-performance electro-catalysis material and an electrode material of new energy devices such as a lithium-ion battery and a solar cell.

The invention belongs to the technical field of transition metal oxide-carbon materials, and specifically provides a zinc cobalt oxide/graphene/carbon nanofiber composite material and a preparation method thereof. The preparation method provided by the invention comprises the following steps: preparing a polyacrylonitrile nanofiber membrane through electrospinning, coating graphene oxide on polyacrylonitrile nanofiber through a solution immersion process, preparing a graphene/carbon nanofiber composite membrane through high-temperature carbonization, and finally subjecting the graphene/carbon nanofiber to one-step hydrothermal process so as to realize in-situ growth of zinc cobalt oxide nanoparticles. The zinc cobalt oxide/graphene/carbon nanofiber composite material prepared by using the method provided by the invention has controllable morphology, high specific surface area and excellent conductivity, can be used as an ideal high-performance electrocatalytic material and an electrode material for new-energy devices like lithium ion batteries and solar cells.

The invention provides a Co-N-C composite material based on Bio-MOF-11 as well as preparation and application thereof. The Co-N-C composite material based on Bio-MOF-11 is characterized by being prepared from Bio-MOF-11 by virtue of high temperature carbonization, and Bio-MOF-11 is obtained by reaction between cobalt acetate and adenine. Biological MOF is prepared by virtue of metal organic coordination, and then, a high temperature carbonization technology is adopted to obtain a transition metal nitrogen-doped carbon material with high catalytic activity. The prepared Co-N-C composite material has higher ORR performance and electrochemical stability and simultaneously is an ideal zinc-air battery catalyst.

The invention relates to a gel pyrolysis-based cobalt-nitrogen-doped carbon composite material and a preparation method and an application thereof. The composite material is prepared by performing high-temperature carbonization on a gel precursor which is prepared from cobalt and an organic ligand in a coordination manner; and the preparation method comprises the steps of preparation of cobalt composite gel, preparation of dry gel, and preparation of the gel pyrolysis-based cobalt-nitrogen-doped carbon composite material, wherein the composite material is used for an oxygen reduction catalyst.The preparation method is an environmental protection, simple and green and chemical synthetic method; the obtained cobalt-nitrogen-doped carbon composite material has the advantages of stable chemical property, large specific surface area and high electro-catalytic property; and by making full advantage of transition metal Co and N doping, more active sites are provided, thereby improving the electro-catalytic property.

The invention belongs to the technical field of a transition metal selenide-conductive polymer and particularly relates to a molybdenum selenide/polyaniline nanofiber composite and a preparation method of the molybdenum selenide/polyaniline nanofiber composite. The preparation method comprises the steps of preparing polyaniline nanofibers by a solution method and growing molybdenum selenide nanosheets in situ on the polyaniline nanofibers by a one-step solvothermal method. The prepared molybdenum selenide/polyaniline nanofiber composite is controllable in pattern, has higher specific surface area and excellent conductivity, can serve as an ideal high-performance electrocatalysis material and an electrode material of new energy devices such as a lithium ion battery and a solar battery.

The invention provides a graphene-titanium dioxide aerogel composite material and preparation and application thereof. The graphene-titanium dioxide aerogel composite material is characterized in thatnano titanium dioxide particles are grown in a graphene oxide lamellar structure by in-situ polymerization. According to the invention, a porous three-dimensional network structure anode material isprepared by virtue of the high specific surface area of graphene aerogel, the high specific capacity of sulfur and the strong adsorption force of nano titanium dioxide on lithium polysulfide, so thata shuttle effect of lithium polysulfide can be effectively solved, and the electrochemical performance of a lithium-sulfur battery can be fully improved. Related test results show that the first cyclespecific discharge capacity of the anode material is 1520mah/g at a current density of 0.5C, and the specific discharge capacity remained at 800mah/g after 100 cycles of circulating. The composite material provided by the invention provides a simple way for preparing the anode material of the lithium-sulfur battery, and has a good application prospect.

The invention relates to the field of thermal insulation materials and provides a preparation method of polyimide aerogel. The method is characterized by comprising the following steps: step 1, preparing polyamide acid hydrogel; step 2, freezing the polyamide acid hydrogel at low temperature, and performing freeze drying and thermal imidization to obtain the polyimide aerogel. The prepared polyimide aerogel has low density, high strength and high flame retardant capacity, isotropic and anisotropic thermal insulation materials can be obtained, various application scenarios can be met, the preparation process is simple and easy to operate, shorter time is needed, cost is low, environmental protection is realized, toxic solvents are not used, and the potential of large-scale application is provided.

The invention relates to a molybdenum sulfide/ferric oxide composite material and a preparation method and an application thereof. The composite material is characterized in that ferric oxide nanorods are grown on a molybdenum sulfide nanosheet. The preparation method comprises the following steps: stripping molybdenum sulfide ore through a liquid phase method to obtain the molybdenum sulfide nanosheet; transferring the molybdenum sulfide nanosheet into water through a solvent transfer method and carrying out ultrasonic dispersion to obtain a molybdenum sulfide nanosheet water-phase dispersion liquid; and growing a ferric oxide precursor nanostructure on the molybdenum sulfide nanosheet through a chemical bath deposition method, and then, carrying out high-temperature heat treatment to obtain the molybdenum sulfide/ferric oxide composite material. The composite material has good uniformity and consistency; electrochemical activity and conductivity of the material are good; when the composite material serves as an electrode material for a super capacitor, good charge-discharge rate and cycling stability are realized; and the composite material is convenient and environmentally friendly in the preparation process, low in reaction temperature, high in safety coefficient, and easy for industrial production.

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 polytriphenylamine-carbon nanofiber composite material, and a preparation method and an application thereof. The preparation method of the polytriphenylamine-carbon nanofibercomposite material comprises the following steps: performing electrospinning, imidization and high-temperature carbonization to prepare flexible carbon nanofibers, and growing polytriphenylamine on the surface of the carbon nanofibers by an in-situ polymerization technology. The carbon nanofibers prepared in the invention have the advantages of stable chemical properties, good electrical conductivity and good mechanical properties. The polytriphenylamine/carbon nanofiber composite material prepared in the invention has the characteristics of self-supporting property, controllable morphology, uniformity of the polytriphenylamine growing on the surface of the carbon nanofibers, and fullness in utilization of the unique base structure and the high specific surface area of the carbon nanofibers. The self-supporting polytriphenylamine/carbon nanofiber composite material prepared in the invention is an ideal electrode material in novel energy fields of high-performance flexible devices, secondary batteries, supercapacitors and solar batteries.

The invention provides a method for preparing a three-dimensional pore channel structure by taking wood as a raw material, and belongs to the technical field of battery negative electrode materials. According to the method, wood is used as a precursor, and the three-dimensional pore channel structure is obtained through three steps of chemical treatment, freeze drying and high-temperature carbonization. The three-dimensional pore channel structure regulated and controlled by the invention has excellent hierarchical pores, and has the following advantages as an electrode material of a battery and a supercapacitor: 1) the transmission distance of ions can be effectively shortened, and a continuous electron transmission path is provided; and 2) the micropores can provide a large number of adsorption sites for electrolyte ions, the mesopores can provide rapid ion migration channels, and the macropores can store the electrolyte in blocky particles, so that the transmission distance of the electrolyte ions from the electrolyte to the surface of the electrode is shortened.