226 results about "Surface oxygen" patented technology

The invention provides an in-situ modified lithium-rich manganese-based precursor and a preparation method and application thereof.The preparation method comprises the following steps that a nickel-cobalt-manganese mixed metal salt solution, a precipitator solution and a complexing agent solution are introduced into a base solution for a first coprecipitation reaction, and after the first coprecipitation reaction is finished, feeding is stopped; and introducing a doped nickel-cobalt-manganese mixed metal salt solution, a precipitant solution, a complexing agent solution and a carbon source solution into a system after the first coprecipitation reaction is finished, and carrying out a second coprecipitation reaction to obtain the in-situ modified lithium-rich manganese-based precursor. According to the preparation method, doping elements and a carbon source are introduced when the lithium-rich manganese-based precursor is prepared through the coprecipitation reaction, in-situ uniform construction of oxygen vacancies and a carbon coating layer on the surface of the material is synchronously achieved, the in-situ modified lithium-rich manganese-based precursor is obtained, the treatment step of subsequent secondary coating can be reduced, the production cost can be reduced, and the method is suitable for industrial production. The technological process is shortened.

The invention provides a Cu2O-based heterogeneous composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: coating the surface of a Cu2O hollow sphere substrate with a carbon layer, and depositing layered double hydroxides (LDHs) and metal palladium (Pd) nanoparticles on the carbon layer. According to the material, through a Cu2O-carbon layer-LDHs-Pd multistage heterostructure design, space optimization of light absorption, charge transfer and catalytic sites is realized; cu2O-carbon layer-LDHs interface coupling promotes directed migration of photo-induced electron-hole pairs, and the surface plasmon resonance effect of Pd nanoparticles enhances the charge separation efficiency; the LDHs optimizes a charge transfer path through surface oxygen vacancy or metal valence cycle, so that synergistic oxidation of non-free radicals and free radicals is realized, the organic matter degradation efficiency is remarkably improved, the oxidation path is widened, and the performance bottleneck of a single material is broken through.

The invention provides a method for preparing a spinel type catalyst rich in oxygen vacancies under the assistance of magnetization treatment and application of the spinel type catalyst. The synthesis method of the catalyst comprises the following steps: (1) preparing a precursor of the catalyst by adopting a hydrothermal method: putting a metal foam carrier into a mixed solution of metal salt ions such as ferric nitrate, manganous nitrate and cobalt nitrate, adding ammonium fluoride and urea, carrying out hydrothermal reaction, repeating the hydrothermal reaction for several times, and washing and drying to obtain the precursor; and (2) putting the catalyst precursor into a magnetization reactor, putting the magnetization reactor in the center of an alternating magnetic field coil, and carrying out magnetization treatment on the catalyst precursor in an air or oxygen atmosphere to obtain the spinel type catalyst rich in oxygen vacancies. The method is simple in process and low in cost, and the obtained product is uniform in morphology and good in repeatability and has high photo-thermal catalytic oxidation toluene performance. Through a clean, pollution-free and in-situ directional heating electromagnetic induction auxiliary technology, removal of oxygen atoms on the surface of the spinel catalyst is promoted, so that rich oxygen vacancies are introduced into cobalt-manganese spinel, the exchange effect between the catalyst and oxygen molecules is accelerated, and the reaction rate of catalytic oxidation of VOCs is promoted. When the intensity of simulated sunlight is 500 cm <-2 >, the concentration of toluene is 1000 ppm, the air speed is 45000 mL.gcat <-1 >. H <-1 >, the conversion rate of toluene reaches 86% or above, and high-efficiency oxidation of toluene can be realized under the driving of the simulated sunlight.

According to the preparation method and the application of the high-nickel positive electrode material with the core-shell structure, the deep charge-discharge specific capacity and the cycling stability of the layered positive electrode material are remarkably improved by controlling the calcination condition of the high-nickel positive electrode material in an oxygen-free environment, regulating and controlling the oxygen vacancy on the surface of the material and synthesizing the sample with the core-shell structure. Meanwhile, the method is simple, effective and low in cost, and the prepared material is good in morphology uniformity and suitable for large-scale production.

The present invention belongs to the technical field of battery materials, and provides a lithium-rich lithium ferrite lithium supplementing agent, a synthesis method and a use thereof. In the synthesis method, a solid electrolyte, conductive carbon and elemental sulfur are mixed and subjected to low-temperature heat treatment to form a composite mixture, and then the composite mixture is secondarily mixed with lithium-rich lithium ferrite and subjected to low-temperature heat treatment to form a mixed coating layer on the lithium-rich lithium ferrite, thereby obtaining the lithium-rich lithium ferrite lithium supplementing agent. Sulfur in the mixed coating layer can absorb the surface oxygen released during the charging process of the lithium-rich lithium ferrite, thereby reducing gas generation. The solid electrolyte and the conductive carbon can form an ionic and electronic conductive network, avoiding the difficulty of Li+ extraction and the decrease of lithium supplementing capacity caused by too thick sulfur coating. At the same time, the low-temperature heat treatment causes the elemental sulfur to melt, which can play a role in dispersion and adhesion, realizing the uniform dispersion of the solid electrolyte and the conductive carbon and the effective coating of the composite mixture, which is beneficial to improving the binding property and compatibility. The obtained mixed coating layer can effectively improve the air stability of the lithium supplementing agent.

The invention relates to the technical field of heat storage materials, in particular to a simulation method for strengthening the heat storage performance of molten salt by using nano-particle oxygen vacancy defects. The method comprises the following steps: constructing a unit cell structure of silicon dioxide, determining a nanoparticle model containing a surface oxygen vacancy defect based on the unit cell structure of silicon dioxide, and constructing a final silicon dioxide-potassium carbonate nanofluid model based on the nanoparticle model containing the surface oxygen vacancy defect; performing molecular dynamics simulation based on the final silicon dioxide-potassium carbonate nanofluid model to obtain molecular dynamics simulation data; based on molecular dynamics simulation data, the final heat storage performance parameters of the silicon dioxide-potassium carbonate nanofluid model are determined, and by means of the setting mode, results obtained through simulation discover that the heat storage performance of the molten salt can be effectively improved through nano-particle oxygen vacancy defects.

The invention relates to the technical field of sodium ion batteries, in particular to an MOF-coated layered oxide positive electrode material, a preparation method thereof and a sodium ion battery. The preparation method comprises the following steps: ball-milling and mixing a metal source and a sodium source, and calcining to obtain a layered oxide positive electrode material; the preparation method comprises the following steps: adding Mn salt or Al salt and 2, 5-dihydroxy terephthalic acid into a mixed solvent composed of dimethyl amide, ethanol and deionized water, stirring, and reacting to obtain an MOF material; and mixing the layered oxide positive electrode material and the MOF material, and carrying out heat treatment to obtain the MOF-coated layered oxide positive electrode material. The MOF serving as a coating layer material has a large-aperture structure, a diffusion channel is provided for sodium ion transmission, and the migration rate of sodium ions is increased; mn-MOF or Al-MOF is used as a coating layer material, so that the surface oxygen defect concentration of the layered oxide positive electrode material can be adjusted, the reversibility of oxidation reduction of oxygen anions can be improved, and the coulombic efficiency and the cycling stability of the battery during charging and discharging under a high-voltage condition can be further improved.

The invention discloses a sodium metavanadate-based catalyst activity gradient regulation and regeneration system and method, and relates to the technical field of industrial catalyst regeneration, the sodium metavanadate-based catalyst is of a unique layered structure, the sodium metavanadate-based catalyst comprises an outer layer, a middle layer and an inner layer from the surface to the interior in sequence, and active components and doping elements of all the layers are different; the outer layer is doped with high-content sodium metavanadate and manganese oxide, reactant molecules can be quickly adsorbed and activated in the initial stage of the reaction, the manganese oxide can provide additional active sites, reduce reaction activation energy and promote quick start of the reaction, and the middle layer is doped with a proper amount of sodium metavanadate and cerium oxide, so that the reaction is more stable in the process of the reaction. The cerium oxide can adjust migration and conversion of oxygen species on the surface of the catalyst, optimize the reaction path, improve the selectivity of a target product and reduce side reactions, the inner layer is doped with the low-content sodium metavanadate and tungsten oxide, and the structural stability of the catalyst under high-temperature and long-time reaction is maintained by means of the high stability of the tungsten oxide.

Partially oxidized carbonaceous materials characterized by substantially homogenous, partially oxygenated surfaces thereof are enabled via microwave-assisted methods that are simple and fast. The exemplary methods include combining carbonaceous material(s), at least one mild oxidizer, at least one nucleophile, and an aqueous solvent system to obtain a mixture; and exposing the mixture to microwave radiation for a predetermined time to produce partially oxidized carbonaceous materials. The predetermined time may be in a range from about 5 seconds to about 2 hours, and the power of the microwave energy may be in a range from about 100 w to about 1700 W. The partially oxidized carbonaceous materials are characterized by a homogeneous distribution of oxygen content in surfaces thereof, in nonzero amounts up to about 10 at %, and a standard deviation of surface oxygen content in a range from about 0.1 at % to about 1.0 at %.

The invention discloses a preparation method of a full-spectrum response plasmon photocatalyst for reducing carbon dioxide to prepare methane, and belongs to the technical field of photocatalytic reduction of CO2. Tungsten hexacarbonyl and silver nitrate, nickel chloride or chloroauric acid are used as raw materials, and a solvothermal reaction is performed to obtain a plasmon W18O49 nanowire photocatalyst doped with different metal ions. According to the preparation method for preparing the CH4 plasmon photocatalyst through full-spectrum response CO2 reduction, the prepared Au, Ag or N metal ion doped plasmon W18O49 nanowires have high ultraviolet-visible-near infrared light absorption capacity and rich surface oxygen vacancy concentration, adsorption and activation of CO2 molecules are facilitated, meanwhile, the surface oxygen vacancy concentration is increased, and meanwhile, the surface oxygen vacancy concentration is increased. The surface of the catalyst can effectively stabilize a * CO intermediate generated in the photocatalytic CO2 reduction process, and the performance and selectivity of the original plasmon W18O49 for preparing CH4 through photocatalytic CO2 reduction are remarkably improved.

The invention belongs to the technical field of wire grinding, and particularly relates to a bare copper wire surface deoxidizing device and a using method thereof.The bare copper wire surface deoxidizing device comprises a grinding base and a control box installed at the top of the grinding base and further comprises a mounting plate, the mounting plate is fixedly installed on the side wall of the grinding base, and a plurality of oxidation detection units are inserted into the side wall of the mounting plate; each oxidation detection unit is used for detecting the surface roughness of the bare copper wire, the multiple insulation sleeves are fixedly inserted into the side wall of the polishing base, and a detachable mounting pipe is rotationally connected to the interior of each insulation sleeve. According to the device, the oxidation state and degree of the surfaces of the multiple bare copper wires can be monitored online in real time, the grinding time is automatically controlled based on the detection result, grinding piece abrasion is reduced, resource waste is reduced, the grinding efficiency is improved, meanwhile, grinding scraps can be rapidly collected, replacement of a loss piece is reminded in time, and the oxygen removal effect of the bare copper wires is prevented from being affected.

The invention belongs to the technical field of catalysts, and relates to a cerium oxide supported nickel catalyst and a preparation method and application thereof, and the catalyst is composed of a metal nickel active component and a cerium oxide carrier. The cerium oxide prepared by adopting a reversed-phase microemulsion method is dispersed in a nano-scale manner, has a large specific surface area and abundant oxygen vacancies on the surface, can realize high dispersion of metal nickel after loading nickel on the cerium oxide, has relatively high stability, and is beneficial to realizing efficient methanation of carbon dioxide hydrogenation. By changing the preparation conditions of the reversed-phase microemulsion, the number of oxygen vacancies on the surface of the catalyst can be effectively adjusted, and the CO2 hydrogenation reaction performance of the catalyst is regulated and controlled. The cerium oxide supported nickel catalyst prepared by the invention has the CO2 conversion rate of 83% and the CH4 selectivity of 97%, and shows excellent CO2 conversion rate and methane selectivity, which indicates that the cerium oxide-containing catalyst provided by the invention has excellent CO2 hydrogenation performance, shows excellent catalytic activity, product selectivity and stability, and can be used for preparing a catalyst for hydrogenation of CO2. And large-scale industrial application can be realized.

The application discloses a preparation method and application of PTFE catalytic filter material, and the preparation of the PTFE catalytic filter material comprises MnCeTi catalyst preparation, PTFE catalytic fiber preparation, heteropoly acid functionalization and needling. The three-dimensional flower-shaped spherical structure of the prepared PTFE catalytic filter material is used to optimize the mass transfer and conversion channel of pollutants, the intermetallic interaction of Mn, Ce and Ti is used to regulate the surface acid sites and active sites of the catalyst, the surface oxygen vacancies, acid sites and other characteristics are further optimized through the heteropoly acid functionalization, and the low-temperature catalytic dioxin performance of the PTFE catalytic filter material is effectively improved. Meanwhile, the heteropoly acid can form polyoxometalate on the surface of the catalyst, the adhesion strength of the catalyst and the filter material is strengthened, the loss problem of the catalyst in the use process is effectively relieved, and the prepared PTFE catalytic filter material has high efficiency and long-term use performance.

The invention provides a silicon-based negative electrode material and a preparation method and application thereof, and particularly relates to the field of negative electrode materials, the negative electrode material comprises an inner core and a coating layer coating the surface of the inner core, the inner core is composed of a porous carbon matrix and silicon nano-particles deposited in pore channels of the porous carbon matrix, the coating layer is a short-range ordered high-texture carbon layer, and the coating layer is a silicon nano-particle coating layer. The thickness of the high-texture carbon layer is 0.5-30 nm, the length-diameter ratio of the carbon lines is 1-10, and the interlayer spacing is 0.33-0.37 nm. According to the technical scheme, through the synergistic effect of the surface oxygen passivation layer and the high-texture carbon coating layer formed at a high temperature, silicon volume expansion is effectively inhibited, side reactions are reduced, and meanwhile the electrode conductivity and cycling stability are remarkably improved.

The invention relates to the technical field of lithium ion batteries, in particular to a nickel cobalt lithium manganate positive electrode material and a preparation method thereof. According to the invention, the technical problems of poor cycle performance and low specific capacity of the existing nickel cobalt lithium manganate positive electrode material are solved. The preparation method comprises the following steps: synthesizing precursor powder by adopting a coprecipitation process; then carrying out high-shear mixing on the precursor, lithium hydroxide, nano niobium oxide and magnesium fluoride; after the mixed material is subjected to pre-oxidation and high-temperature oxygen-enriched gradient sintering, a gradient reduction etching process is adopted in the cooling stage, and strong wind quenching is matched for surface shaping; and finally, carrying out air jet pulverization and demagnetization to obtain the nickel cobalt lithium manganate positive electrode material. According to the method, lattice respiration stress is effectively dissipated by constructing a radial ordered structure, a bulk phase structure is stabilized through multi-element synergistic doping, interfacial ion transport kinetics is optimized through reduction-induced surface oxygen vacancies and a lattice distortion layer, and the synergistic strategy ensures high stability of the material structure and meanwhile, the material structure has a good application prospect. And the de-intercalation efficiency of the active lithium is greatly improved.

The invention discloses high-purity nickel powder prepared from plant polyphenol through field flow control, a system and a method, a sulfonated tannic acid-gallic acid bio-based system is used as a reduction-stabilizer, and green and efficient preparation of nickel nano powder is realized through a multi-physical field synergistic effect of a three-stage gradient continuous flow reactor and double-frequency ultrasonic-pulse microwave-nitrogen bubbling. The total residence time of the reaction is 25.1-37.7 min, mother liquor is reused after being subjected to salt separation treatment (nanofiltration desalination of a NiSO4 system and ion exchange Cl removal of a NiCl2 system), and the wastewater discharge amount is greatly reduced compared with that of a traditional process; the surface oxygen content of the product is smaller than or equal to 0.9 wt%, the PDI is smaller than or equal to 0.15, the tap density is larger than or equal to 4.0 g / cm < 3 >, the GB / T 33828-2017 standard is met, the method can be used for the high-end field of lithium ion batteries and the like, and green industrial production of the nanometer nickel powder is achieved from the source.

This invention discloses a copper-tungsten oxide / zinc oxide heterojunction photocatalyst, its preparation method, and its application, belonging to the field of nanomaterials and photocatalysis technology. Firstly, a single-atom copper-modified plasma W-type photocatalyst is synthesized using a solution-thermal method combined with an impregnation-thermal reduction process. 18 O 49 Nanowires were first prepared; then porous ZnO nanosheets were prepared via a hydrothermal method combined with calcination; finally, single-atom copper-modified plasma W was constructed via electrostatic self-assembly. 18 O 49 Nanowire / porous ZnO nanosheet heterojunction composite material. This invention utilizes the above-described preparation method to prepare Cu-W nanowires with matched band structures. 18 O 49 / ZnO heterojunction can realize the photogenerated electrons of ZnO into the plasma Cu-W 18 O 49 Nanowire implantation stabilizes and increases the surface oxygen vacancy concentration and free electron density, thereby enhancing the surface plasmon resonance effect and promoting the continuous generation of high-energy hot electrons. Single-atom copper active sites and W 18 O 49 The synergistic effect of nanowires enables the enriched hot carriers to efficiently and selectively photocatalytically reduce CO2 to CH4.

An electrode which includes nanoparticles of a carbon-doped tin oxide of formula C—SnO2-x where x=is from 0.001 to 0.1, having surface oxygen vacancies. The electrode includes a fluorine-doped tin oxide substrate. A film of the nanoparticles is present on at least one surface of the fluorine-doped tin oxide substrate. The surface oxygen vacancies correspond to an O 1s peak shift of 0.5-2 eV in the X-ray photoelectron spectroscopy (XPS) for C—SnO2-x compared to C—SnO2 without surface oxygen vacancies.

The invention discloses a sodium ion battery hard carbon negative electrode material and a preparation method thereof, and belongs to the technical field of carbon material synthesis and electrochemistry. The hard carbon negative electrode material is prepared by carrying out pre-oxidation treatment, inert atmosphere pyrolysis, constant-speed cooling and crushing treatment on an animal hair generating substance material. According to the invention, the corresponding relationship among the interlayer spacing, the micropore number and the surface oxygen-containing groups of the animal hair generating substance fiber under the preoxidation-inert atmosphere temperature-changing pyrolysis, the sodium storage capacity and the cycling stability is determined; the rabbit hair-based hard carbon negative electrode prepared under the optimal condition realizes the sodium storage specific capacity of 265.30 mAh g <-1 > and the capacity retention ratio of 88.55% after 300 cycles under the current density of 50mA g <-1 >. The low-cost large-scale preparation scheme of the hard carbon negative electrode material, which can be industrially popularized, provided by the invention provides technical reference for industrial development of the sodium-ion battery.

The invention discloses a photochromic TiO2-PEG200 (Polyethylene Glycol 200) nano particle and an application of the photochromic TiO2-PEG200 nano particle in photocatalytic oxidation of a C-H bond. The catalyst is synthesized through a solvothermal method, PEG200 is used as a solvent and a modifier, and self-doped Ti < 3 + > and surface oxygen vacancies are introduced into TiO2. Under the irradiation of blue light (405nm), the catalyst generates a photochromic effect, Ti < 4 + > is reduced into high-concentration Ti < 3 + > in situ, and meanwhile, a large amount of superoxide free radicals (O < 2 + >) are generated. A photo-generated hole directly activates an ethylbenzene alpha-C-H bond to generate a benzyl free radical, and the benzyl free radical reacts with a superoxide free radical (O2.) and is finally converted into acetophenone. The catalyst has excellent visible light response and charge separation efficiency, and the acetophenone yield is up to 56 mmol.g <-1 >. H <-1 > and is 10 times that of traditional TiO2. The reversible circulation of Ti < 3 + > / Ti < 4 + > enables the catalyst to maintain good stability, and the activity is still maintained at 95% or above after five times of circulation. The operation conditions are mild (room temperature and normal pressure), a strong oxidant is not needed, an efficient, stable and environment-friendly photocatalysis solution is provided for C-H bond activation, and the method has important application value in the field of fine chemical synthesis.

A thin film transistor may be manufactured by forming a gate electrode in an insulating layer over a substrate, forming a gate dielectric over the gate electrode and the insulating layer, forming an active layer over the gate electrode, and forming a source electrode and a drain electrode contacting a respective portion of a top surface of the active layer. A surface oxygen concentration may be increased in at least one of the gate dielectric and the active layer by introducing oxygen atoms into a surface region of a respective one of the gate dielectric and the active layer.

The application provides a lithium supplement additive and a preparation method and application thereof. The lithium supplement additive comprises a lithium-rich material, and the lithium-rich material is a lithium-rich oxide. The particle structure of the lithium-rich material comprises a central region and a surface layer region arranged in sequence from inside to outside. The surface layer region contains first oxygen vacancies, and the concentration of the first oxygen vacancies gradually decreases from the side close to the central region to the side far from the central region. The lithium supplement additive provided by the application comprises a lithium-rich material, and the lithium-rich material comprises a central region and a surface layer region. In the surface layer region, the concentration of oxygen vacancies gradually decreases from inside to outside. The arrangement can effectively reduce the diffusion of surface oxygen vacancies to the inside and the structural instability and continuous oxygen and gas production caused thereby, and can also reduce the occurrence of electrolyte side reactions, thereby reducing gas production.

The application discloses a preparation method of a lightweight oxidation-resistant coating on a carbon-based composite material surface, which comprises the following steps: brushing a slurry containing a carbon source on the surface of the carbon-based composite material, solidifying, forming a carbon source transition layer on the surface of the carbon-based composite material, and then performing a molten salt assisted infiltration treatment on the surface of the carbon source transition layer to obtain the lightweight oxidation-resistant coating. The preparation method of the application provides the carbon source for the subsequent process by pretreating the carbon-based composite material, and adds a suitable reinforcing phase to improve the bonding force between the coating and the substrate. Then, the molten salt disproportionation reaction is used to prepare the coating, the thickness and microstructure of the coating are strictly controlled by controlling the infiltration process, and finally, the smooth, uniform and dense lightweight oxidation-resistant carbide ceramic sealing layer is obtained. In the oxidation process, a glassy film is formed to seal the surface oxygen diffusion channel, the short-term ablation resistance is excellent, and the lightweight high-strength requirement of aerospace vehicles can be met.

The present invention belongs to the technical field of composite catalytic material preparation and relates to a polypyrrole-coated defective molybdenum trioxide catalyst for use in oxidative desulfurization. A method for preparing the catalyst is also disclosed, comprising uniformly dispersing molybdenum powder in n-butanol, slowly adding hydrogen peroxide with continuous stirring, and adding pyrrole when the reaction solution turns bright yellow and transparent. Stirring is continued at room temperature overnight. The solution is placed in an autoclave and subjected to a hydrothermal reaction at 100-160°C for 12-20 hours. After cooling to room temperature, the reaction is centrifuged, and the precipitate is washed with deionized water and anhydrous ethanol, respectively. The resulting precursor is collected and vacuum dried to obtain the catalyst. Using molybdenum powder and pyrrole as raw materials, the present invention employs a one-step hydrothermal synthesis method to produce a polypyrrole-coated defective molybdenum trioxide catalyst with abundant surface oxygen vacancies. This catalyst enhances light absorption efficiency and photothermal conversion efficiency, thereby improving photocatalytic oxidative desulfurization performance. The prepared composite catalyst exhibits advantages such as good selectivity, high stability, and a stable structure.

The application discloses a gradient nickel oxide film and a preparation method and application thereof, and comprises the following steps: first, vacuumizing a reaction chamber, then putting a target material into the reaction chamber, inputting argon, and starting illumination, wherein the target material is a pure nickel target; then inputting oxygen, gradiently adjusting the oxygen content, adopting a reaction magnetron sputtering method to deposit sputtering on the target material in an argon and oxygen mixed gas atmosphere, setting sputtering power and deposition time, and obtaining the gradient nickel oxide film with gradiently changed surface oxygen content; compared with an existing chemical deposition method, the preparation method is stable in process and stable in component, the obtained nickel oxide film has a thickness of 10 nm, small crystal grains make the film have the best conductivity, the film can not only block the electrons in the absorption layer from going to a bottom electrode ITO layer, but also can guide away holes due to the good conductivity, so that invalid recombination is reduced, and finally the battery efficiency is improved.

This invention discloses a low-vacuum laser welding device for medium-thick aluminum alloy plates, belonging to the field of metal welding technology, aiming to solve the problems of prominent porosity defects and insufficient mechanical properties in the welding of medium-thick aluminum alloy plates. The device consists of a laser cleaning and oscillating welding integrated module, a low-vacuum welding chamber module, a control system, and a detection module. The laser cleaning module uses a pulsed fiber laser to remove the oxide layer at an optimal energy density of 13.24 J / cm² under nitrogen protection, reducing the surface oxygen content to 9.66%. The low-vacuum welding chamber module constructs a negative pressure environment of 10²-10³ Pa to suppress plasma plumes. The oscillating laser welding module optimizes the stirring of the molten pool by achieving circular oscillation with a frequency of 80 Hz and an amplitude of 1 mm. The control system coordinates and regulates the parameters of each module, and the detection module monitors the weld quality in real time. This device reduces the weld porosity to below 0.032% and the tensile strength to 388.62 MPa (83.16% of the base material), making it suitable for welding medium-thick aluminum alloy plates for aerospace applications.

The invention relates to the technical field of laser coating, in particular to a high-power laser cavity surface coating device which comprises a box body, a vacuum chamber is arranged in the box body, a key removing station used for placing a laser bar is arranged in the vacuum chamber, a key removing accompanying strip located over the key removing station is arranged in the vacuum chamber, and the laser bar is placed in the key removing accompanying strip. The material of the de-bonding strip is the same as that of the laser bar, a plurality of activation strips are arranged on one side, facing the de-bonding station, of the de-bonding strip, the activation strips are made of Pt, an air blowing pipe is arranged between the de-bonding strip and the de-bonding station, and hydrogen is introduced into the air blowing pipe. Hydrogen blown out of the gas blowing pipe is rapidly dissociated into atomic state H + after encountering the activation strip, the atomic state H + has the energy of about 1 eV, has high reducibility and can rapidly reduce dangling bond molecules on the cavity surface, so that after oxygen molecules and water molecules on the surface are removed, the molecules can be pumped away along with a vacuum system under the vacuum condition, and the hydrogen is discharged out of the cavity surface. And a clean laser surface is left.

The invention belongs to the technical field of selective catalytic reduction, and particularly relates to a preparation method of a CeO2-CuNi0. 5Mn1. 5O4 composite catalyst and application of the CeO2-CuNi0. 5Mn1. 5O4 composite catalyst in stable CO-SCR denitration in an aerobic environment. The CeO2-CuNi < 0.5 > Mn < 1.5 > O < 4 > composite catalyst synthesized by a solution-gel method can be applied to the field of CO-SCR (selective catalytic reduction). Compared with an existing catalyst, the CeO2-CuNi0. 5Mn1. 5O4 composite catalyst has the advantages that the number of surface active sites is large, richer surface oxygen vacancies are provided, a CeO2 fluorite structure serves as a rigid framework to inhibit spinel phase grain aggregation, spinel phase compact crystal lattices lock metal ions, XRD crystal phases are not obviously changed before and after the reaction, the structural stability is remarkable, and the catalyst is suitable for industrial production. And the catalyst still has excellent CO-SCR performance in an aerobic environment.

The invention relates to the field of lithium primary batteries, in particular to an all-weather double-high lithium / carbon fluoride battery as well as a preparation method and application thereof. According to the invention, mixed acid pretreatment is carried out on the surface of CFx, an oxygen-containing functional group is introduced for surface oxygen modification, and the components of a discharge product are obviously changed through the design of a low-melting-point electrolyte, so that the lithium / carbon fluoride primary battery which can be used in all weathers is designed. The technical problems that a traditional Li / CFx primary battery electrolyte is high in melting point, high in viscosity, slow in ion transport kinetics at low temperature, high in electrode / electrolyte interface resistance and the like are solved, and the energy density and the power density of the Li / CFx primary battery in a wide temperature range are comprehensively improved. The preparation process of the electrolyte is simple, the yield is high, and the electrolyte is suitable for large-scale production and has a wide application prospect.

The application belongs to the technical field of organic solid waste resource utilization and high-value conversion, and specifically discloses a dual-phase rare earth metal-based high-entropy oxygen carrier for waste plastic gasification, a preparation method and application thereof. a Ni b Co c Mg d M e O y , wherein a, b, c, d and e are respectively 5% to 35% of atomic percentage, a+b+c+d+e=100% is satisfied, M is a rare earth metal Ce or La, and y is in the range of 0 to 4 but not 0. The dual-phase structure formed after the introduction of the rare earth metal enhances the surface oxygen vacancy content of the oxygen carrier, is beneficial to the migration of the lattice oxygen to participate in the gasification reaction, the high-entropy oxygen carrier lattice is distorted, the metal-oxygen bond is weakened, and then the oxygen release capacity is promoted, the catalytic cracking capacity for waste plastics is improved, and the syngas yield and the oxygen carrier circulation stability are improved. The preparation method of the oxygen carrier is simple, can be widely used in the field of waste plastic gasification, and has high use value.