217results about How to "Achieve doping" patented technology

The invention relates to an application of a porous carbon material with a grading pore structure in a lithium-air cell anode, and is characterized in that the carbon material has mutually communicated grading pore structure distribution which has a mesoporous structure for depositing the discharge products and a macroporous structure suitable for transmission of oxygen and an electrolyte. When the carbon material is taken as a material of the lithium-air cell anode, the space utilization rate of carbon material can be increased at maximum limitation during a charge and discharge process, specific discharge capacity, voltage platform and multiplying power discharge capability of the cell can be effectively increased, so that the energy density and power density of the lithium-air cell can be increased. The porous carbon material has the advantages that the preparation technology is simple, the material source is wide, the grading pore carbon material pore structure enables regulation and control, the regulation and control modes are various, and the doping of metal/metal oxide can be easily and simultaneously realized.

The invention discloses a preparation method for vanadium dioxide and doped powder thereof. The method comprises the following steps: 1, weighing vanadium pentoxide, hydrogen peroxide and distilled water, preparing the materials into a V<5+>-containing complex aqueous solution; 2, adding a reducing agent, a surfactant and a dopant to the complex aqueous solution, and stirring to form a clear solution; 3, transferring the resulting solution from the step 2 to a hydrothermal reaction kettle, and carrying out a reaction for 1-168 hours at a temperature of 140-220 DEG C to obtain the doped powderof the VO2(B); 4, placing the resulting doped powder of the VO2(B) from the step 3 in high pure argon atmosphere or nitrogen atmosphere, and annealing for 10-720 minutes at the temperature of 400-700DEG C to obtain the doped powder of the VO2(M). The method of the present invention has characteristics of low cost, simple process and easy control, and is suitable for the large-scale industrial production. With the method of the present invention, the doping of the VO2 powder material can be realized, and the doped atoms can be uniformly dispersed in the VO2.

The invention provides a preparation method of a supercapacitor carbon material. In the method, cheap and easily available biomass such as pericarp, vegetables and the like is taken as raw materials, and the supercapacitor carbon material is obtained through steps including thiourea hydro-thermal processing, impurity removing processing, freeze drying processing, calcining processing, alkali/microwave activation processing and the like. The material has the characteristics of a layered structure and a large specific surface area. Since a thiourea hydro-thermal step is carried out in a preparation process, S and N in thiourea molecules are introduced, the specific volume of the material is effectively improved, and an electrode prepared by use of the material has the advantages of large specific volume and good circulating stability. According to the invention, wastes such as watermelon peel, shaddock peel and the like and cheap vegetables such as sweet potatoes, radishes and the like are taken as the raw materials, such that the production cost is decreased, and the preparation method also accords with the strategy of sustainable development for environmental protection and has an important popularization value.

The invention belongs to the technical field of organic and inorganic composite materials, in particular to a preparation method of organic and inorganic composite fibrous materials with supercritical carbon dioxide. The method includes pre-treatment and activation treatment of cellulose, doping of inorganic sol to the cellulose, etc. The invention makes use of the strong permeability of the carbon dioxide under supercritical conditions, can activate the cellulose with cosolvent, or lead nano particles in the inorganic sol to be absorbed and settled on the surface of the cellulose to form an even, continuous and stable coating layer; meanwhile, some sol particles penetrate into the fiber, so as to dope plenty of cellulose. The supercritical carbon dioxide adopted by the invention is safe, reliable, non-toxic, no pollutant and recyclable, and is environment friendly green solvent. The method of the invention is simple and easy to be operated, and the hybrid material has broad application prospect.

Provided is an alkali metal doping method in the large-scale production of CIGS (copper, indium, gallium, selenium) thin-film solar cells. The method comprises a step of depositing an Mo metal back electrode layer on a glass substrate, a stainless indium substrate or a flexible substrate; a step of preparing a CIGS optical absorption layer; performing alkali metal element doping and deposition on the CIGS optical absorption layer; a step of performing thermal treatment on the alkali metal thin film formed after the deposition so as to make the alkali metal permeate into a CIGS crystal boundary and to improve characteristics of the crystal boundary; a step of cleaning alkali metal residues; a step of depositing a CdS, ZnS or InS buffer layer on the CIGS thin film after the cleaning of the alkali metal residues; and a step of depositing a high-resistance i-ZnO layer and a high-resistance ZnO:Al window layer, and thus a CIGS solar cell is formed. According to the alkali metal doping method, after annealing, the permeation of the alkali metal does not affect the generation of the CIGS crystal lattices; after the permeation of the alkali metal into the CIGS optical absorption layer, filling factors are substantially improved and the cell photoelectric conversion efficiency is improved when the open circuit voltage is improved.

The invention relates to a method for increasing performance parameters of a quantum dot sensitized solar battery. In the method, Ca<2+> is doped into CdS and serves as a sensitizing agent to assemble the quantum dot sensitized solar battery; the conduction band of Cds is enhanced, so electronic energy can be injected into TiO2 more effectively; meanwhile, the absorption state of the Cds quantum dot on the surface of an electrode material is improved, the dark current is restrained, and short circuit current and photoelectric conversion efficiency of the solar battery are improved. The processing method is simple, easy to operate, and low in cost.

The invention relates to a nitrogen-doped porous carbon material used for anode of a lithium-air cell, which has a mutually communicated graded pore structure, N is uniformly doped in a C frame, wherein N accounts for 0.2-15% of carbon material, the graded pore comprises a mass transfer pore and a deposition pore, the pore volume of the deposition pore accounts for 40-95% of total pore volume, and the pore volume of the mass transfer pore accounts for 4-55% of total pore volume. The carbon material as the lithium-air cell material can greatly increase the space utilization rate of the carbon material during a charge and discharge process at maximum limit, so that lithium-air cell energy density and power density can be effectively increased. The nitrogen-doped porous carbon material used for anode of lithium-air cell has the advantages that the preparation technology is simple, the material source is wide, the pore structure of the graded aperture carbon material enables regulation and control, and the regulation and control modes are various, and the nitrogen doping mode is easy to realize.

The present invention relates to a nitrogen-doped porous carbon material for a lithium-air battery positive electrode. The nitrogen-doped porous carbon material is characterized in that the nitrogen-doped porous carbon material has an interconnected graded pore structure, N is uniformly doped in the C skeleton, N accounts for 0.2-15% of the carbon material atomic ratio, the graded pores comprise mass transfer pores and deposition holes, the deposition holes account for 40-95% of the total pore volume, and the mass transfer pores account for 4-55% of the total pore volume. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the energy density and the power density of the lithium-air battery can be effectively increased; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the nitrogen doping manner is easily achieved.

The invention discloses a light emitting diode (LED) fluorescent powder with single matrix white light excited by near ultraviolet and a preparation method thereof, the chemical formula of fluorescent powder is that: NM1-x-y-zPO4:xR, yG, zB, wherein N is freely selected from at least one of a group formed by Li, Na and K; M is freely selected from at least one of a group formed by Mg, Ca, Sr, Ba and Zn; R is freely selected from at least one of a group formed by Mn and Sm; G is Tb; and B is freely selected from at least one of a group formed by Ce and Eu, and x is higher than 0 but lower than 0.25, y is higher than 0 but lower than 0.25, and z is higher than 0 but lower than 0.25. The particle size of the prepared fluorescent according to the method provided by the invention is small and uniform, doping of fluorescent material activator on a molecule level is realized, three bands of red, green and blue can be emitted by excitation of near ultraviolet of 350-410nm, the color display index is high, and can be used in the white light LED excited by near ultraviolet.

The invention relates to a preparing method for sulfur-doped graphene to mainly solve the problems that in the prior art, the preparing reaction temperature of sulfur-doped graphene is high, the requirement for equipment is high, raw materials are extremely poisonous, and productivity is low. The preparing method comprises the following steps that firstly, oxidized graphite is subjected to ultrasonic exfoliation in a solvent, and an oxidized graphene solution is obtained; secondly, the oxidized graphene solution and a sulfur compound are mixed and subjected to ultrasonic treatment to be dispersed and mixed evenly, and a mixture is obtained; thirdly, the mixture is subjected to a hydrothermal reaction, and the sulfur-doped graphene is obtained. The problems are well solved though the technical scheme, and the preparing method can be used for the industrial production of sulfur-doped graphene.

The invention relates to a method for growth of a germanium nitrogen codoped silicon carbide single crystal material. A PVT method is adopted according to the method; in the germanium-doped silicon carbide single crystal growth process, nitrogen at a certain proportion is led into a growth atmosphere, argon is led in to serve as a carrier gas with the pressure controlled to be 700-850 mbar, argon flow is 15-30 sccm, and the nitrogen flow is 0.5-2 sccm; and the germanium nitrogen codoped silicon carbide single crystal is obtained. On the one hand, high-concentration germanium element doping is implemented, and on the other hand, by adjusting specific doping concentration of germanium and nitrogen, the goal of increasing silicon carbide crystal lattice fitness degree, reducing crystal stress and improving crystal quality is achieved. Application of the silicon carbide crystal material to visible light and infrared light wave bands is expanded.

The invention provides a preparation method of a nitrogen-doped titanium dioxide photochemical catalyst loaded with a foam metal carrier. In the preparation method provided by the invention, a vacuum arc ion plating process is used and a prepared nitrogen-doped titanium dioxide film of a photochemical catalyst can be uniformly distributed on the surface of a porous metal, so that the contact areafor a catalytic reaction of the photochemical catalyst is increased and the photocatalytic activity of the photochemical catalyst is higher.

The invention provides single matrix white light fluorescent powder for a white light LED and a preparation method thereof. The chemical composition of the fluorescent powder is Ca2SiO3Cl2: xEu2+, yMn2+, wherein the value ranges of the x and the y are 0.5 to 3 percent. The preparation method comprises the following steps of: dissolving calcium nitrate tetrahydrate and anhydrous calcium chloride into distilled water to obtain solution A; preparing europium nitrate solution B; dissolving the solution B and manganese nitrate tetrahydrate into the solution A together, and stirring the mixture uniformly to obtain solution C; adding anhydrous ethanol into the solution C, stirring the solution uniformly, then adding tetraethoxysilane into the solution, adjusting the pH to between 2 and 3, and stirring the mixture for 1 hour in a 80 DEG C water bath to obtain precursor sol; preparing the precursor sol into wet sol and then preparing the wet sol into dry sol, performing hydrothermal reaction on the dry sol in a reaction kettle, and naturally cooling the reaction product to room temperature after the reaction is finished; and finally, centrifuging and washing the reaction product to obtain a final product. The fluorescent powder prepared by the method emits three bands of 428 nanometers, 500 nanometers and 581 nanometers, and the three bands are superposed to generate white light for emitting; the fluorescent powder has small grain size and uniform distribution, and is like spheroid; and the preparation method is simple and has low energy consumption and low equipment requirement.

The invention belongs to the technical field of carbon-sulfur batteries and particularly relates to an amino functional carbon-sulfur composite material of a porous structure and a preparation method and application of the material. Polyimide serves as the raw material, is pre-oxidized and then synthesized into an amino-containing carbon material precursor of the porous structure by means of a pore forming agent at the nitrogen atmosphere through high-temperature carbonization, the precursor and elemental sulfur are subjected to heat treatment, and the carbon-sulfur composite material is obtained. The process is simple, reproducibility is good, and the prepared composite material has a rich pore structure and can be used for the positive pole of a carbon-sulfur battery. Amino groups in the composite material can enhance constraint to polysulfide anions, dissolution and migration of the polysulfide anions in electrolyte are reduced, electric chemical performance of the positive pole material of the carbon-sulfur battery is improved, and specific discharge capacity, rate capability and cycle performance are good.

The invention relates to a method for preparing nanometer zinc oxide whiskers doped with transitional mental. Zinc powder, zinc oxide, alkaline zinc carbonate or zinc hydroxide, and the like are used as zinc predecessors, and metal and metal chloride are used as doped element predecessors. After being mechanically mixed, the zinc predecessors and the doped element predecessors are added to plasma arcs to have a gas phase reaction after high-frequency induction plasma is instantaneously gasified at a high temperature, and then the uniformly doped nanometer zinc oxide whiskers are obtained by appearance control in a condensing process. The method is characterized by being applied to the doping of various elements and having high doping content and strong suitability, and the prepared nanometer zinc oxide whiskers are uniformly doped and have controllable appearance. The invention has short technological process and high yield and can continue mass production.

The invention relates to a bimetal supported magnetic visible-light composite catalytic material, and a preparation method and application thereof, belonging to the technical field of photocatalytic degradation. The invention provides the bimetal supported magnetic visible-light composite catalytic material, and the preparation method and application thereof to overcome problems in realization ofboth high catalytic activity and easy recoverability. The visible-light composite catalytic material comprises Fe/Zr-MOF, Fe3O4 and g-C3N4. Fe3O4 is doped into g-C3N4 to form Fe3O4-g-C3N4; and Fe/Zr-MOF is used as a carrier. The method comprises the following steps: adding urea and Fe3O4 into a solvent, carrying out dispersion and mixing, and performing desolventization and drying; then performingcalcining at a high temperature to obtain Fe3O4-g-C3N4; and adding Fe3O4-g-C3N4, an iron source, a zirconium source and an organic ligand into a water-soluble solvent and performing sintering. The composite catalytic material can be used for catalytic degradation of organic pollutants, is easy to recover and has high catalytic activity.