38results about How to "Co-doping" patented technology

The invention provides a preparation method of heteroatom doped graphene-based material supported noble metal nanoparticles. The preparation method comprises steps as follows: preparation of a heteroatom doped graphene-based material: a graphene-based material is subjected to ultrasonic treatment, a heteroatom precursor is added, heteroatom doping is performed in a hydrothermal kettle at the temperature of 150-200 DEG C, and the heteroatom doped graphene-based material is obtained; preparation of the heteroatom doped graphene-based material supported noble metal nanoparticles: the heteroatom doped graphene-based material is dissolved in deionized water and subjected to ultrasonic treatment, a stabilizer and a metal precursor are added, metal in the metal precursor is platinum, palladium, gold or silver, the mixture is continuously stirred, pH is adjusted to range from 8 to 14, a reduction agent is added, the mixture is continuously stirred, and the heteroatom doped graphene-based material supported noble metal nanoparticles are obtained after vacuum drying. The synergistic effect of the heteroatom and the carrier on noble metal is used, the activity and the stability of a catalyst are effectively improved, and a preparation process is simple and suitable for industrial production and has higher economic value.

The invention relates to a method for synthesizing a heterogeneous atom doped carbon material through a one-step process. The method comprises the following steps of uniformly dispersing a carbon material and a heterogeneous atom source into water and/or ethanol to obtain a mixed solution, and carrying out hydrothermal reaction at 120-200 DEG C for 12-48 hours to prepare the heterogeneous atom doped carbon material, wherein a heterogeneous atom comprises at least one of N, S, B, P and F. The heterogeneous atom doped carbon material prepared according to the method disclosed by the invention is doped with the heterogeneous atom, keeps the original properties of the carbon material, namely surface area, aperture distribution, crystal structure and the like are basically unchanged, has good oxygen reduction property, hydrogen storage property, carbon dioxide adsorption property and the like and can be used for the fields of fuel-cell catalysts, lithium batteries, supercapacitors, absorption, gas storage and the like.

In the invention, magnetic control sputtering technology is used for growth of P-type ZnO crystal film. By the method, vacuum degree of reaction chamber is extracted to at least 4X10 to the power -3 pa, zinc-aluminium alloy that mass percent content is 0.1-0.3, NaO and O2 that purity is more than 99.99 percent are used as sputtering gas, the two gases are separately controlled by gas flomweter and mixed in buffer chamber, then are send to vacuum reaction chamber, under 3-5 Pa pressure, first step, substrate is heated to temp. 590-610 deg.C, a layer of N-Al codoped P type buffer film is deposited on the substrate, second step, the temp. of substrate is adjusted to 480-520 deg.C, then a layer of N-Al codoped P type ZnO crystal film is growth on the buffer layer. The crystal film produced by the invention has better doping uniformity, reproducibility, stability, super optical property and P type conducting characteristic.

The invention provides a preparation method of black phosphorus graphene composite material-loaded noble metal nanoparticles. The method comprises the following steps: firstly, preparing a black phosphorus graphene composite material: carrying out ball-milling on a black phosphorus nanometer lamellar material and a graphene nanometer lamellar material under the protection of argon, then respectively washing products with ethanol and water, carrying out suction filtration to obtain the black phosphorus graphene composite material, carrying out vacuum drying on the obtained black phosphorus graphene composite material, and collecting; then, dispersing the black phosphorus graphene composite material into ethanol, carrying out ultrasonic treatment and then adding a stabilizer and a metal precursor; continuously carrying out ultrasonic agitation, adjusting a pH value to 9-11, then adding a reducing agent, continuously stirring, and carrying out vacuum drying to obtain the black phosphorus graphene composite material-loaded noble metal nanoparticles. According to the black phosphorus graphene composite material-loaded noble metal nanoparticles, a black phosphorus graphene composite material carrier is better combined with noble metal, so that the electro-chemical activity and stability of a fuel-cell catalyst are effectively improved; furthermore, a preparation technology is easy to operate, thus being suitable for large-scale production.

The invention belongs to the technical field of an environmental material, and particularly relates to a molybdenum and carbon-codoped titanium oxide nanotube array thin film material and a preparation method thereof. The molybdenum and carbon codoping of a titanium oxide nanotube can be realized by introducing molybdenum element into the titanium oxide nanotube formed on a titanium sheet and the surface thereof through alloying, and then introducing carbon element through carbon monoxide atmospheric thermal treatment; in the obtained molybdenum and carbon-codoped titanium oxide nanotube array thin film material, a part of titanium atoms in the titanium oxide nanotube are replaced by molybdenum, a part of oxygen atoms are replaced by carbon, the ratio of the molybdenum atoms to carbon atoms ranges from 0.03 to 0.15, and the ratio of the doped carbon atoms to titanium atoms ranges from 0.01 to 0.09. The thin film material is attached to a titanium alloy substrate, and comprises orderly titanium oxide nanotubes perpendicular to the substrate. The photocatalysis and photo-electrochemical properties of the thin film material in visible light are far higher than those of the traditional titanium oxide thin film material, and the thin film material has excellent application prospects on the aspects of photocatalytically degrading organic matters in water and reducing heavy metal ions.

The invention discloses a method for preparing a self-doped Fe-N-C oxygen reduction electrocatalyst through animal blood salting-out thermal polymerization. The method comprises the following steps: performing salting-out thermal polymerization on animal blood to obtain a precursor, removing water in the precursor to crush, putting the crushed polymer powder under inert atmosphere to perform high-temperature thermolysis, and washing, and performing vacuum freeze-drying to obtain the self-doped Fe-N-C oxygen reduction electrocatalyst, wherein the salting-out thermal polymerization refers to separating out precipitates after adding salt into the animal blood, and adding the precipitates into water to boil, wherein the salt is sodium chloride or potassium chloride. The catalyst prepared by the method has excellent oxygen reduction and electro-catalytic performance.

The invention discloses a carbon material, a preparation method therefor and an application of the carbon material. The carbon material is ferrum, nitrogen and sulfur codoped multistage-pore nano-carbon, wherein a catalyst has a thin-layer flake texture. The carbon material serves as a fuel cell cathode, the catalyst is a ferrum, nitrogen and sulfur codoped multistage-pore nano-carbon redox catalyst, multistage-pore nano-carbon is doped with ferrum, nitrogen and sulfur elements, and multistage pores comprise micropores, mesopores and macropores. The carbon material has efficient redox catalysis performance and can be applied to air electrode catalysts of hydrogen-oxygen fuel cells, zinc-air fuel cells, magnesium-air fuel cells and aluminum-air fuel cells.

The invention provides a preparation method of nickel nitride graphene composite material-loaded previous metal nanoparticle. The preparation method comprises the steps of preparing a nickel nitride graphene composite material; respectively washing a nickel nitride nanosheet and a graphene nanosheet layer material with ethyl alcohol and water after ball-milling under argon protection, performing filtering to obtain the nickel nitride graphene composite material, and performing vacuum drying and collection; and dispersing the nickel nitride graphene composite material in the ethyl alcohol, adding a stabilizing agent and a metal precursor after ultrasonic treatment, continuing to perform ultrasonic stirring, adjusting pH to be 9-11, adding a reducing agent, continuing to stir, and obtainingthe nickel nitride graphene composite material-loaded previous metal nanoparticle after vacuum drying. The nickel nitride graphene composite material carrier is combined very well with previous metal,the electrochemical activity and the stability of a fuel cell catalyst are effectively improved, and moreover, the preparation process is easy to operate and is suitable for mass production.

The invention discloses a method for preparing rare earth-doped quartz glass microstructure optical fibers by a laser melting technology. The method comprises the following steps of powder preparation, melting, doped rod treatment and optical fiber precast rod preparation, and rare earth-doped quartz glass microstructure optical fiber drawing. The invention discloses a use of the uniformly doped quartz glass rod in an all solid state laser and a microstructure optical fiber. The invention discloses a laser melting system. The laser melting system comprises a powder feeding device, a laser source, a mother rod, a clamp, a motor and a guide rail. The prepared rare earth-doped powder and the quartz glass microstructure optical fibers realize uniform doping of a plurality of rare earth ions. The prepared doped microstructure optical fibers have a rare earth ion effective-doping concentration more than 10000ppm.

The invention discloses a preparation method of a lithium and nitrogen co-doped diamond film. The preparation method comprises the following steps: coating a layer of suspension liquid containing a lithium source on the surface of a substrate on which a diamond film is pre-deposited; after drying, putting into a reaction chamber of a heater chemical vapor deposition system, heating in a hydrogen atmosphere to melt powder containing the lithium source and allowing lithium to be dispersed in diamond; subsequently further depositing the lithium and nitrogen co-doped diamond film in a nitrogen-containing atmosphere by adopting a heater chemical vapor deposition method. The lithium and nitrogen co-doped diamond film has low surface work function, is liable to emit electrons under the effect of heat and the effect of an electric field, and can be applied to thermo-electron energy transforming components and field emission display components.

The invention discloses topological chemical reduction Eu < 3 + >/Eu < 2 + > co-doped UV-LED white light microcrystalline glass and a preparation method thereof. The topological chemical reduction Eu < 3 + >/Eu < 2 + > co-doped UV-LED white light microcrystalline glass is prepared from, by mole, 40%-60% of SiO2, 10%-25% of Al2O3, 10%-20% of Na2CO3, 8%-15% of YF3, 6%-15% of NaF, 0.1%-0.5% of Eu2O3 and 0.02%-0.1% of a reducing agent, the reducing agent is nitride or carbide, all the raw material components are mixed and ground according to the set proportion, and melting and annealing are carried out to obtain the white light microcrystalline glass. According to the invention, a high-temperature solid-phase melting reaction is directly carried out in air, Eu < 3 + > is partially reduced in situ by using a nitride or carbide reducing agent so as to realize co-doping of Eu < 3 + > and Eu < 2 + >, and white light is generated under excitation of 395nm ultraviolet, so that the white-light microcrystalline glass is obtained.

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a catalyst for catalyzing hydrolysis of ammonia borane to produce hydrogen as well as a preparation method and application of the catalyst. The phosphorus-and-copper co-doped cobalt oxide composite material catalyst is prepared by taking a ZIF-67 zeolite imidazate framework structure material as a precursor and performing carbonization doping with Cu and P elements, wherein active components are Cu, Co, O and P elements, and the catalyst is marked as P-Cu-Co3O4@C. The catalyst shows excellent catalytic activity in the reaction of hydrogen production through hydrolysis of ammonia borane, catalytic activity can reach 111.06 mol H2.mol<-1> cat. min<-1 >, apparent activation energy is 38.31 kJ/mol, and 68% of catalytic activity is kept after five times of cyclic catalytic reaction. The catalyst is simple in preparation process and low in cost, raw materials are easy to obtain, and the catalyst has wide application prospects. Meanwhile, the anion-cation co-doping method also provides a new thought for design and synthesis of the high-performance catalyst.

The invention provides a preparation method of an N/S doubly doped metallic carbon compound material. The preparation method comprises the following steps: preparing an organic complex material, namely dissolving dithizone in ethanol, then adding a metal atom precursor, wherein the molar ratio of a dithizone organic ligand to the metal atom precursor is (1-4):1, stirring the mixed solution at the temperature of 30-85 DEG C, and then drying; and then preparing the N/S doubly doped metallic carbon compound material, namely putting the organic complex obtained after drying into a tubular furnace, carrying out heat preservation for 1-12 hours at the temperature of 400-900 DEG C under the nitrogen protection condition, then cooling to room temperature, then carrying out acid pickling, finally activating according to the mass ratio of the material to potassium hydroxide of 1:(2-6), and then washing to be neutral with deionized water, so that the N/S doubly doped metallic carbon compound material is obtained. The preparation method provided by the invention has the advantages that a strong oxidation bridge effect among metal, carbon and hetero atoms is combined, and electrochemical properties of the metallic carbon compound material are effectively improved.

The invention discloses a filter screen usable for an air purifier and a preparation method of the filter screen. The filter screen comprises a substrate layer and an activity layer, the substrate layer is provided with a modified foam nickel screen coated with a carbon micro-sphere coating, and the activity layer is provided with TiO2 co-doped Pt, Ag, N and F. The preparation method of the filterscreen includes the steps: firstly, performing reaction on the foam nickel screen in sugar solution, and performing drying and roasting to obtain the substrate layer; secondly, soaking the substratelayer into mixed solution of ammonium fluorotitanate, urea and deionized water to perform reaction, drying and roasting to obtain the filter screen with the surface with N and F co-doped TiO2 coatings; dissolving chloroplatinic acid and silver nitrate in distilled water, stirring mixture for 30 minutes at room temperature, adding sodium dodecyl benzene sulfonate to continue to stir mixture for 30minutes, and dripping sodium borohydride solution into solution to obtain impregnation liquid; soaking the filter screen with the surface with N and F co-doped TiO2 coatings into the impregnation liquid to perform reaction and drying to obtain the filter screen. The filter screen is small in air resistance and good in catalytic performance.

The invention discloses a boron-nitrogen co-doped carbon nanotube film and a preparation method and application thereof. The preparation method comprises the following steps of: 1) weighing ethanol, ferrocene and thiophene according to a mass ratio of (90-100): (1.3-1.7): (0.5-1.5) to obtain a mixed solution, adding 1-3wt% of boric acid and 2-4wt% of pyridine into the mixed solution, and uniformlydispersing at 40-60 DEG C to obtain a precursor solution, 2) completely sealing a CVD furnace, continuously introducing inert gas to remove air in the furnace, adjusting the temperature of the CVD furnace to 1100-1200 DEG C, and keeping the temperature for 2-5 hours to provide a constant-temperature environment for subsequent growth of the carbon nanotube film, 3) closing the inert gas, continuously introducing H2 as a reaction gas until the whole hearth is filled with H2, injecting the precursor solution obtained in the step 1 into the furnace at a liquid injection rate of 3-8 mL/h by virtueof an ultrasonic atomization device in a uniformly dispersed vaporific droplet manner, and collecting the boron-nitrogen co-doped carbon nanotube film at the bottom of the hearth after 10-30min. Andthe mass specific capacitance of the film is 130-150 F.g<-1>.