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43results about How to "In situ doping" patented technology

Method for preparing nitrogen-doped active carbon from nitrogen-enriched biomass raw material

The invention relates to a method for preparing nitrogen-doped active carbon from a nitrogen-enriched biomass raw material, and belongs to the technical field of preparation of carbon materials. In the method, an active carbon material with relatively high nitrogen doping amount and a large specific surface area is prepared from the biomass raw material with rich nitrogen through carbonization and activation in an inert atmosphere. The method has the advantages as follows: the raw material is environment-friendly and renewable; the preparation process is simple; in-situ nitrogen doping can be achieved; the nitrogen doping amount and a pore structure can be controlled at the same time; a new way is provided for high-added value utilization of the nitrogen-enriched biomass raw material. The prepared nitrogen-doped active carbon can be used as an efficient electrode material, an absorbent material and a catalyst carrier and applied to the field of energy and environmental protection.
Owner:BEIJING UNIV OF CHEM TECH

Preparation of nano-HAP coating/magnesium alloy composite biological material

The invention provides a method for making a nano HAP coating / magnesium alloy composite biomaterial. The method is as follows: the method takes a magnesium alloy as a cathode and graphite as an anode; the magnesium alloy and the graphite are placed in electrolyte containing NH4H2PO4, NaHO3 and Ca(OH3)2.4H2O so as to carry out stepped electrodeposition at a temperature of between 60 and 95 DEG C and a voltage of between minus 5 V to minus 1 V and 0 V, thereby effectively improving the interface bonding between a coating and a matrix and reducing hydrogen evolution during electrodeposition; meanwhile, the increase of magnesium ions at an interface can realize in-situ doping of magnesium ions and hydroxyapatite so as to generate a magnesium phosphate transition layer on the surface of the magnesium alloy and to increase bonding strength; thus, a degradable nano acicular hydroxyapatite / magnesium alloy coating composite biomaterial with excellent mechanical property, biocompatibility and corrosion resistance can be obtained. Meanwhile, the method also has the advantages of low cost of raw materials and simple technological operation, etc.
Owner:ZHENGZHOU UNIV

Biomass-based nitrogen-doped porous carbon material, and preparation method and application thereof

The invention provides a preparation method of biomass-based nitrogen-containing porous carbon with the advantages that simplicity is realized; the implementation is easy; the cost is low. According to the method, the in-situ doping of nitrogen atoms in the carbon material preparation process is realized by a one-step foaming method; cheap and reproducible protein-rich plants are used as carbon precursors; the in-situ doping of nitrogen atoms in the carbon material preparation process is favorably realized, so that the doping content is controllable, and the distribution is uniform. All raw materials are renewable resources; green and environment-friendly effects are achieved; simplicity is realized; the obtaining is easy; the resources are rich; the cost is low. Meanwhile, the method provided by the invention has the advantages that the nitrogen-doped porous carbon material with the large specific surface area can be obtained without complicated multistep operation; the preparation process is simple; the use of high-pollution chemical reagents such as ZnC12, strong base and strong acid is avoided; the environment-friendly effect is achieved; the operation is convenient; equipment cannot be corroded in the production and use processes; the method is suitable for large-scale production.
Owner:QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1

Preparation method for rare earth element-doped titanium dioxide nano material

The invention relates to a preparation method for a rare earth element-doped titanium dioxide nano material. The method comprises the steps of dissolving urea and rare earth element nitrate in absolute ethyl alcohol; adding liquid titanium source into the above solution to form a homogeneous solution; adding deionized water with stirring to form a transparent gel; performing hydro-thermal treatment on the above gel; washing, filtering and drying to obtain the rare earth element-doped titanium dioxide nano material. An object of doping titanium dioxide by using the rare earth element is realized through automatic regulation and control of pH value of a reaction system by slow decomposition of urea in the hydrothermal process. The preparation method is simple in process and flow, has wide parameter adjustable range, strong repeatability and low cost, and can be used for preparing different rare earth element-doped titanium dioxide nano materials or a plurality of the rare earth elements co-doped titanium dioxide nano material.
Owner:SHANGHAI NAT ENG RES CENT FORNANOTECH

Lithium-sulfur battery positive electrode material and preparation method thereof

The invention discloses a lithium-sulfur battery positive electrode material and a preparation method thereof. An electrostatic spinning solution with solutes of a carbon-containing polymer and a carbon-containing polymer and transnational metal salt is prepared firstly, and electrostatic spinning and carbonization processing are performed to obtain a dual-layer flexible transitional metal-in-situ-doped carbon nanofiber base material; then, liquid phase sulfur loading is performed through a sublimed sulfur / carbon disulfide solution to obtain a sulfur-loaded dual-layer carbon nanofiber base material; next, a four-layer carbon nanofiber base material with carbon nanofiber layers with in-situ doped transitional metal and uniformly loaded with sulfur in the middle two layers is constructed; then the temperature is heated to 150 DEG C and maintained for 15min; furnace cooling is performed to obtain the lithium-sulfur battery positive electrode material; the sulfur content is 40-60%; when the lithium-sulfur battery positive electrode material is directly used as the positive electrode of the flexible binder-free and self-supported lithium-sulfur battery, very high discharge specific capacity and stable cycle performance are achieved; and the high-rate charging-discharging performance is obviously improved compared with that of the lithium-sulfur battery positive electrode material inthe prior art.
Owner:UNIV OF SHANGHAI FOR SCI & TECH

Preparation method for cicada slough based porous carbon material used for electrochemical capacitor

The invention discloses a preparation method for cicada slough based porous carbon material capable of being used for an electrochemical capacitor. Cicada slough is adopted as a carbon source, an alkaline metal hydroxide is adopted as an activating agent, and the two steps of medium-temperature pre-carbonation and high-temperature activation are carried out, so that the cicada slough based porous carbon material for a high-performance supercapacitor is prepared; the prepared carbon material has the characteristics such as higher specific capacitance value, better cycle performance and higher multiplying power in a water system electrolyte, for example, in a 6.0 M KOH electrolyte, the weight specific capacitance value of the carbon material can reach 355 Fg<-1>, 288 Fg<-1> and 283 Fg<-1> respectively under the electric current density of 1 Ag<-1>, 10 Ag<-1> and 30 Ag<-1>, and after the carbon material is charged and discharged in a circulating manner for 3000 times under the condition of 10 Ag<-1>, the capacitance retention value of the carbon material is still 90% or above of the original value. According to the invention, biomass materials are fully utilized, the cost is low, the sources are wide, the preparation technology is simple, and the prepared porous carbon material has large specific surface area and excellent electrochemical capacitor performance, and has wide application prospect in the field of electrochemical energy storage.
Owner:SOUTHEAST UNIV

Dual-rare earth-co-doped titanium dioxide gas sensitive sensing material preparation

The invention relates to a dual-rare earth-co-doped titanium dioxide gas sensitive sensing material preparation. The method includes the following steps of: adding urea and nitrate of rare earth elements into absolute ethyl alcohol and dissolving the urea and the nitrate of the rare earth elements to obtain solution; adding liquid phase titanium sources into the solution to form a homogeneous solution; stirring and adding deionized water into the homogeneous solution to form transparent gel; and performing hydro-thermal treatment on the transparent gel, and then performing washing, filtering and drying to obtain a dual-rare earth-co-doped titanium dioxide gas sensitive sensing nano-material. Through automatic regulation of pH to a reaction system by means of slow decomposition of the urea in a hydrothermal process, the rare earth elements can be doped into titanium dioxide; the raw materials are cheap, the dual-rare earth-co-doped titanium dioxide gas sensitive sensing nano-material with excellent crystallization can be prepared at the normal temperature, and the material is lower than 10 ppm in detection limit of ammonia gas. The dual-rare earth-co-doped titanium dioxide gas sensitive sensing material can be applied to the field of gas sensitive sensors, and also can be applied to the fields of microwave absorption materials, supercapacitors, electrochromism, and photocatalysts.
Owner:SHANGHAI NAT ENG RES CENT FORNANOTECH

Method for preparing nitrogen-doped porous carbon for supercapacitor by utilizing metal organic framework compound

The invention discloses a method for preparing nitrogen-doped porous carbon for a supercapacitor by utilizing a metal organic framework compound and belongs to the field of material preparation. The method comprises the following specific steps of firstly, dispersing nano CaCO<3>@PDA particles in methanol, then adding a certain mass of PVP (Polyvinyl Pyrrolidone) and zinc nitrate, and preparing solution A; secondly, dissolving a certain mass of 2-methylimidazole in the methanol, preparing solution B, rapidly guiding the solution B into the solution A, and standing for a period of time to obtain CaCO<3>@PDA@ZIF-8; finally, placing the CaCO<3>@PDA@ZIF-8 into a tubular furnace for high-temperature carbonization to obtain the product. The method disclosed by the invention has the beneficial effects that the preparation process is strong in controllability; the organic framework compound and the nano CaCO<3> can be uniformly compounded, and the prepared nitrogen-doped porous carbon is adjustable in specific surface area, porous structure and surface property and has better electrochemical property.
Owner:DALIAN UNIV OF TECH

Carbon quantum dot with fluorescence property, and preparation method and applications thereof

The invention provides a carbon quantum dot with a fluorescence property, and a preparation method and applications thereof. According to the preparation method, chrysanthemums are steamed, washed, and dried, then chrysanthemums are place in a baking oven to carry out reactions for 16 to 48 hours at a temperature of 150 to 220 DEG C, after reactions, the baking oven is cooled to the room temperature, the obtained brownish black product is subjected to centrifugation; the collected solution is filtered by a filter membrane, and after filtration, the obtained yellow or brown solution is the carbon quantum dots with a fluorescence property. The carbon quantum dot preparation technology is simple, the raw materials are easily available, the cost is low, and the carbon quantum dot can be used as a mark free fluorescent probe and can be used to detect the pH and trivalent iron high selectively and high sensitively.
Owner:INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY

Semiconductor device preparing method

The invention relates to a semiconductor device preparing method. The method comprises the following steps: a semiconductor substrate is provided, wherein the semiconductor substrate at least includes a gate structure; and grooves are formed in two sides of the gate and a SiGeB layer is grown in the grooves through epitaxial growth. The method is characterized in that B is doped in an in-situ manner while performing the epitaxial growth of the SiGe layer, and the epitaxial growth comprises two stages: the first stage is to increase the concentration of B in the SiGe layer to make the concentration of B in the SiGe layer reaches the peak concentration; and the second stage is to reduce the concentration of B in the SiGe layer so as to eliminate the short-channel effect. Through the method of the invention, not only a more flat doping tail contour can be acquired after the B doping process is performed so as to reduce the junction leakage phenomenon, and the method can skip the separate ion implantation process so as to make the stress in the channel region maintained; and but also the method can be used to make the doping concentration of B at channels is low so as to eliminate the short-channel effect to make prepared devices have good performances.
Owner:SEMICON MFG INT (SHANGHAI) CORP

Method of preparing room temperature ferromagnetism Zn(1-X)Mn(X)O diluted magnetic semiconductor nano-line

the invention discloses a preparing method of indoor-temperature magnetic Zn1-xMnxO nanometer line in the rare-magnetic semiconductor nanometer material preparing domain, which comprises the following steps: cleaning silicate through HCl and acetone; adopting Zn powder and MnCl2 powder and evaporating source in the adjacent quartz ship; making silicate as receiving substrate at intersecting part of two evaporating source vertically; setting the vertical distance between silicate and evaporating source at 6-8 mm; placing quartz ship in the pipe-typed furnace; aerating gas in the system inlet; conducting gas in the water through rubber conduct; aerating argon gas at 300-400ml / min for 5-8 min; changing the flow of argon gas at 30-50 ml / min; heating the pipe-typed furnace at 800-830 deg.c; maintaining the system pressure at atmospheric condition; keeping temperature for 120-150 min; cooling to indoor temperature naturally to obtain the even-distributing Zn1-xMnxO nanometer line.
Owner:UNIV OF SCI & TECH BEIJING

High-elasticity anti-radiation nanofiber aerogel material and preparation method thereof

The invention relates to a high-elasticity anti-radiation nanofiber aerogel material and a preparation method thereof. The method comprises the steps of mixing and stirring tetraethoxysilane, phosphoric acid and water evenly for 1-24 h, then adding titanium dioxide nano powder, continuing stirring for 1-12 h, and conducting ultrasonic treatment to obtain composite hydrolysate; uniformly mixing a polyvinyl alcohol aqueous solution and the composite hydrolysate with water, conducting stirring for 1-12 hours, and then carrying out electrostatic spinning on the precursor solution to obtain a hybrid nanofiber membrane; carrying out heat treatment on the hybrid nanofiber membrane; adding the hybrid nanofiber membrane subjected to heat treatment, tetraethoxysilane, boric acid and aluminum chloride into water, adding a graphene oxide solution, and conducting stirring at a high speed to obtain a homogeneous dispersion liquid; and then sequentially subjecting the homogeneous dispersion liquid to freezing, freeze drying and post-treatment processes, so as to prepare the high-elasticity anti-radiation nanofiber aerogel material. The material prepared by the invention has high elasticity and also has excellent radiation resistance, temperature resistance and high-temperature heat insulation performance.
Owner:AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH

Device and method for preparing ordered mesoporous carbon-metal composite material and co-producing biological carbon from solid waste biomass

The invention belongs to the technical field of environmental protection materials, and provides a device and method for preparing an ordered mesoporous carbon-metal composite material and co-producing carbon from solid waste biomass. The device comprises a central control unit, a feeding unit, a double spiral mixing conveying device, a multi-functional reactor, a pH regulator, a solid-liquid separation device, a hydrothermal coupling carbonization device and a pyrolysis gas circulation device. In view of toxic and harmful carbon precursors such as phenol and formaldehyde in the ordered mesoporous carbon field, a dilute acid-coupled metal salt is researched and developed to catalyze hydrothermal acid-decomposition of solid waste biomass instead of toxic reagents, and high-value utilizationof the solid waste biomass is realized. In-situ doping of a metal salt can achieve preparation of the ordered mesoporous carbon-metal salt composite, and the product has both an electric double layerand pseudocapacitance energy storage characteristic, and excellent electrical reserves. In-situ catalysis of the metal salt results in preparation of a high-porosity biological carbon material. The design of integrated equipment realizes continuous operation of acid hydrolysis, solidification and carbonization, and is conducive to industrialization and application.
Owner:DALIAN UNIV OF TECH

N, S co-doped metal-free CNS oxygen reduction catalyst and preparation method thereof

The invention discloses an N, S co-doped metal-free CNS oxygen reduction catalyst and a preparation method thereof, and belongs to the technical field of energy materials and electrochemistry. Glucoseis used as a carbon source, g-C3N4 is used as a nitrogen source and a soft template agent, polysulfide is used as a sulfur source, and the three-dimensional porous carbon material catalyst is synthesized through a hydrothermal-calcination two-step method. The obtained CNS catalyst is of a three-dimensional porous graphene-like structure, the surface of the catalyst contains a large number of porestructures, and the ORR of the catalyst has the initial potential of 1.01 V and the half-wave potential of 0.88 V in an alkaline electrolyte and has better catalytic performance than a commercial Pt / C catalyst. The catalyst has a large number of pores, can expose more active sites, is beneficial to transmission of ORR reaction substances, and is beneficial to improvement of ORR catalytic activityof the material. The selected reagents are low in toxicity, wide in raw material source, low in cost, simple in preparation process, green, pollution-free, easy for large-scale production and beneficial to large-scale application. The catalyst can be used in fuel cells, metal-air cells and other acidic and alkaline primary and secondary cells involving ORR.
Owner:DALIAN UNIV OF TECH

N, S co-doped porous carbon coated carbon nanotube bifunctional oxygen electrode catalyst and preparation method thereof

The invention discloses an N, S co-doped porous carbon coated carbon nanotube bifunctional oxygen electrode catalyst and a preparation method thereof, and belongs to the technical field of energy materials and electrochemistry. The preparation method comprises the following steps of: dispersing a polysulfide precursor into a solvent, transferring an obtained mixture into a reaction container, andreacting at 50-300 DEG C to obtain a polysulfide precursor material; preparing a precursor of the N, S co-doped porous carbon coated CNT catalyst; and finally, putting the obtained NSC-CNT-Px materialinto a reaction furnace, heating to 600-1200 DEG C, and carrying out heat treatment to obtain the N, S co-doped porous carbon coated CNT catalyst. The catalyst prepared by the invention has a large number of pores and a high specific surface area, is beneficial to improving the ORR / OER catalytic activity of a material, is simple in preparation process, is green and pollution-free, is easy for large-scale production, and is beneficial to large-scale application.
Owner:DALIAN UNIV OF TECH

Metal-carbon composite negative electrode material as well as preparation method and application thereof

The invention belongs to the field of battery materials, and particularly relates to a preparation method of a metal-carbon composite negative electrode material; the preparation method comprises thesteps of mixing bituminous coal with a metal source to obtain a mixture; and sequentially performing first-stage sintering, second-stage sintering and third-stage sintering on the mixture to obtain the composite negative electrodes material, wherein the sintering temperature is 300 DEG C or below in the first-stage sintering; the sintering temperature is 400-600 DEG C in the second-stage sintering; and the sintering temperature is 700-1,200 DEG C in the third-stage sintering. The invention also discloses the negative electrode material prepared by adopting the preparation method and an application of the negative electrode material in preparation of a negative electrode of a lithium ion battery. According to the method, bituminous coal is creatively adopted as a raw material; and the raw material is matched with the metal source, and the battery negative electrode material with excellent electrical property can be prepared under the special three-stage sintering mechanism.
Owner:HUNAN JINYE HIGH TECH CO LTD

Carbon microspheres and preparation method thereof

The embodiment of the invention discloses a carbon microsphere and a preparation method thereof, and relates to the technical field of preparation of activated carbon. The invention discloses a preparation method of carbon microspheres, which comprises the following steps: mixing a biomass raw material and biogas slurry according to a mass ratio of 1: (5-20) to obtain a mixed solution; the biogas slurry is alkaline, and the biogas slurry contains a nitrogen element. Placing the mixed solution in a closed space for a hydrothermal reaction to obtain a reaction solution, standing the reaction solution, taking a supernatant, and performing first filtration to obtain first carbon microspheres; nitrogen-containing biogas slurry is selected as a raw material, and in-situ doping of nitrogen is achieved. Moreover, the nitrogen-containing biogas slurry can provide an alkaline environment, a resistance barrier of the biomass raw material can be effectively removed in the hydrothermal reaction process, hydrolysis, polymerization, condensation and carbonization reactions are promoted, and the yield of the carbon microspheres is increased. In addition, the carbon microspheres can be separated in a filtering mode, and the separation mode is simple.
Owner:PEKING UNIV SHENZHEN GRADUATE SCHOOL

Method and device for preparing passivation contact solar cell by plate-type equipment

The invention provides a method for preparing a solar cell with a passivation contact structure by plate-type equipment. The method comprises the following steps: S1, selecting a crystalline silicon substrate; S2, in the plate-type integrated continuous coating equipment, enabling the crystalline silicon substrate to firstly enter an ALD process cavity to deposit a tunneling oxide layer and then enter a PECVD process cavity to continuously deposit a doped amorphous silicon layer; S3, annealing the crystalline silicon substrate to form a doped polycrystalline silicon layer; S4, preparing a silicon nitride anti-reflection layer on the surface of the doped polycrystalline silicon layer, and preparing an aluminum oxide passivation layer and a silicon nitride anti-reflection layer on the othersurface of the doped polycrystalline silicon layer; and S5, preparing metal conductive electrodes on the front surface and the back surface of the crystalline silicon substrate in a silk-screen printing manner. Plate-type transmission is adopted, the tunneling oxide layer and the doped amorphous silicon layer can be continuously prepared in one set of equipment, so procedures are reduced; the ALDand PECVD process temperature is low, so that the badness caused by bending of the silicon wafer can be reduced; and the PECVD process is free of winding plating, the later cleaning step is reduced, and in-situ doping can be realized to reduce the subsequent independent phosphorus doping process.
Owner:江苏杰太光电技术有限公司

Coal-based battery negative electrode material and preparation method and application thereof

ActiveCN110061197AIncrease spacingIncrease the location of lithium storageCell electrodesSecondary cellsSoft CoalsLithium electrode
The invention relates to the technical field of a battery negative electrode material, and particularly discloses a preparation method of a coal-based battery negative electrode material. The preparation method comprises the steps of mixing soft coal and graphene to obtain a mixed material; performing one-segment sintering on the mixed material under 400-500 DEG C, and then performing two-segmentsintering on the mixed material under 700-1,000 DEG C; and obtaining the coal-based battery negative electrode material. The invention also discloses the negative electrode material prepared by the method and application of the negative electrode material used as a negative electrode of a lithium ion battery or a sodium ion battery. The soft coal is creatively used as a raw material, the raw material is matched with the graphene, and the battery negative electrode with excellent electrical performance can be prepared under a special two-segment sintering mechanism.
Owner:HUNAN JINYE HIGH TECH CO LTD

Bio-based carbon microsphere material, preparation method and applications thereof

The invention relates to a bio-based carbon microsphere material, a preparation method and applications thereof, wherein the catalyst adopts biomass chitosan and gallic acid as raw materials. The preparation method comprises: 1) weighing chitosan and gallic acid according to a certain ratio, adding into a reaction kettle having a polytetrafluoroethylene liner, carrying out a reaction for 24-48 h at a temperature of 160-220 DEG C, cooling to a room temperature after completing the reaction, separating and drying the obtained black product to obtain a biomass non-metal catalyst material, washing, and drying to obtain the nitrogen-doped carbon material capable of catalyzing ORR, wherein the material has characteristics of high nitrogen content, rich active sites, suitable surface area and suitable pore volume, can be used as the catalyst in the oxygen reduction catalytic reaction of fuel cells, and can enhance the storage ability of lithium battery electrodes. According to the present invention, the preparation method is simple, the raw materials are the biomass with rich source, the cost is low, the method is environmentally friendly, and the obtained catalyst has excellent performance, and is the promising fuel cell catalyst and the lithium ion battery electrode material.
Owner:INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY

Preparation method for rare earth element-doped titanium dioxide nano material

The invention relates to a preparation method for a rare earth element-doped titanium dioxide nano material. The method comprises the steps of dissolving urea and rare earth element nitrate in absolute ethyl alcohol; adding liquid titanium source into the above solution to form a homogeneous solution; adding deionized water with stirring to form a transparent gel; performing hydro-thermal treatment on the above gel; washing, filtering and drying to obtain the rare earth element-doped titanium dioxide nano material. An object of doping titanium dioxide by using the rare earth element is realized through automatic regulation and control of pH value of a reaction system by slow decomposition of urea in the hydrothermal process. The preparation method is simple in process and flow, has wide parameter adjustable range, strong repeatability and low cost, and can be used for preparing different rare earth element-doped titanium dioxide nano materials or a plurality of the rare earth elements co-doped titanium dioxide nano material.
Owner:SHANGHAI NAT ENG RES CENT FORNANOTECH

Multi-metal in-situ doped desulfurizing agent based on low-coalification-degree inferior coal and preparation method thereof

The invention discloses a multi-metal in-situ doped desulfurizing agent based on low-coalification-degree inferior coal and a preparation method thereof. The preparation method comprises the following steps of: (1) screening out a type of low-coalification-degree coal containing multiple metal elements according to industrial analysis and element analysis of coal; (2) drying, crushing and screening the screened low-coalification-degree coal to obtain pulverized coal; and (3) carrying out heat treatment on the pulverized coal to obtain the multi-metal in-situ doped desulfurizing agent. According to the method, the defect that raw materials are expensive when the hydrogen sulfide adsorbent is prepared is overcome, meanwhile, the characteristic that the low-coalification-degree inferior coal is rich in iron, calcium, magnesium and other metal components is utilized, the low-coalification-degree inferior coal serves as an active component to prepare the desulfurizing agent, no agent needs to be added, the waste of resources is avoided, meanwhile, the solid waste, namely the inferior coal, is effectively utilized, and the purpose of preparing an efficient and cheap hydrogen sulfide adsorbent is achieved.
Owner:长沙工研院环保有限公司

Carbon material with catalytic performance for oxygen reduction reaction and its preparation method and application

The invention provides a carbon material with a catalytic performance on ORR (Oxygen Reduction Reaction) as well as a preparation method and application of the carbon material. The preparation method comprises the following steps: washing chrysanthemum flowers and drying; weighing the chrysanthemum flowers and distilled water and adding into a reaction kettle provided with a polytetrafluoroethylene liner; reacting at 150DEG C to 220 DEG C for 16h to 48h; after reacting, cooling to room temperature and carrying out solid-liquid separation on an obtained brownish black product; carrying out activation treatment on a collected black solid with zinc chloride at the room temperature; then putting the black solid into a tubular furnace and carbonizing at 700 DEG C to 900 DEG under an inert atmosphere for 1h to 4h; washing and drying to obtain the carbon-doped carbon material with the catalytic performance on the ORR. The carbon material provided by the invention has the excellent catalytic performance on the ORR and excellent lasting stability; a preparation process is simple, raw materials re easy to obtain and the cost is low.
Owner:INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY

A method for preparing nitrogen-doped porous carbon for supercapacitors using metal-organic framework compounds

The invention discloses a method for preparing nitrogen-doped porous carbon for supercapacitors by using a metal-organic framework compound, which belongs to the field of material preparation. The specific preparation method is as follows: first, the nano-CaCO 3 Disperse @PDA particles into methanol, then add a certain mass of PVP and zinc nitrate to configure solution A. Secondly, dissolve a certain amount of 2-methylimidazole in methanol, configure solution B, quickly introduce solution B into solution A, and let it stand for a period of time to obtain CaCO 3 @PDA @ZIF‑8. Finally, the CaCO 3 @PDA@ZIF‑8 was placed in a tube furnace for high-temperature carbonization to obtain the product. The preparation process of the present invention is highly controllable; the organic framework compound and nano-CaCO 3 It can be uniformly compounded, and the prepared nitrogen-doped porous carbon has adjustable specific surface area, pore structure and surface properties, and has good electrochemical performance.
Owner:DALIAN UNIV OF TECH

Method of preparing room temperature ferromagnetism Zn(1-X)Mn(X)O diluted magnetic semiconductor nano-line

the invention discloses a preparing method of indoor-temperature magnetic Zn1-xMnxO nanometer line in the rare-magnetic semiconductor nanometer material preparing domain, which comprises the following steps: cleaning silicate through HCl and acetone; adopting Zn powder and MnCl2 powder and evaporating source in the adjacent quartz ship; making silicate as receiving substrate at intersecting part of two evaporating source vertically; setting the vertical distance between silicate and evaporating source at 6-8 mm; placing quartz ship in the pipe-typed furnace; aerating gas in the system inlet; conducting gas in the water through rubber conduct; aerating argon gas at 300-400ml / min for 5-8 min; changing the flow of argon gas at 30-50 ml / min; heating the pipe-typed furnace at 800-830 deg.c; maintaining the system pressure at atmospheric condition; keeping temperature for 120-150 min; cooling to indoor temperature naturally to obtain the even-distributing Zn1-xMnxO nanometer line.
Owner:UNIV OF SCI & TECH BEIJING

MPCVD equipment capable of realizing effective doping

An MPCVD device capable of achieving effective doping comprises a reaction chamber and a gas input structure, the gas input structure comprises two reaction gas pipelines, a distributor connected with the first pipeline evenly conveys gas into the reaction chamber, a gas outlet is located near the top of the reaction chamber, reaction gas is evenly conveyed into the reaction chamber, and the reaction gas is evenly conveyed into the reaction chamber. The gas distributor is located in the top area of the chamber; the first pipeline is used for transmitting a first reactant, the second pipeline is used for uniformly inputting doped reaction gas to the surface of a substrate through a circular ring gas distributor, the horizontal height of a gas transmission ring of the second pipeline is consistent with that of a substrate support, and the gas transmission ring can be placed at the central position and is of an inner concentric structure with the support; the gas transmission ring can also be placed on the periphery of the support, and the gas transmission ring and the support are of an outer concentric structure. According to the invention, the two pipelines are adopted to transmit the reaction gas respectively, so that the doping effect of MPCVD can be effectively realized.
Owner:NANJING UNIV

A kind of lithium-ion battery silicon-based composite negative electrode material and preparation method thereof

The invention provides a silicon-based composite negative electrode material for a lithium ion battery and a preparation method thereof. The silicon-based composite negative electrode material is composed of silicon, silicon oxide, doped metal and carbon material, wherein silicon and doped metal are dispersed in silicon In the substrate formed by oxides, the carbon material is evenly coated on the surface of the material particles, and the negative electrode material is an in-situ nanoscale bulk phase doped metal; the doping metal is selected from the fourth and fifth period transition metal elements and / or the first One or more of the four or five main group metal elements; the total mass of the silicon-based composite negative electrode material is calculated as 100%, the mass of the doped metal accounts for 3-12%, and the mass of the carbon material accounts for 1-10% . Doping metal in silicon oxide can release a part of lithium in the buffer layer through the reverse conversion reaction, and inhibit the agglomeration and growth of the silicon crystal region during the cycle, and improve the first Coulombic efficiency, rate and cycle performance of the negative electrode material.
Owner:BEIJING IAMETAL NEW ENERGY TECH CO LTD +1

A kind of preparation method of semiconductor device

The invention relates to a semiconductor device preparing method. The method comprises the following steps: a semiconductor substrate is provided, wherein the semiconductor substrate at least includes a gate structure; and grooves are formed in two sides of the gate and a SiGeB layer is grown in the grooves through epitaxial growth. The method is characterized in that B is doped in an in-situ manner while performing the epitaxial growth of the SiGe layer, and the epitaxial growth comprises two stages: the first stage is to increase the concentration of B in the SiGe layer to make the concentration of B in the SiGe layer reaches the peak concentration; and the second stage is to reduce the concentration of B in the SiGe layer so as to eliminate the short-channel effect. Through the method of the invention, not only a more flat doping tail contour can be acquired after the B doping process is performed so as to reduce the junction leakage phenomenon, and the method can skip the separate ion implantation process so as to make the stress in the channel region maintained; and but also the method can be used to make the doping concentration of B at channels is low so as to eliminate the short-channel effect to make prepared devices have good performances.
Owner:SEMICON MFG INT (SHANGHAI) CORP
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