376 results about "Cobalt alloy" patented technology

The present invention relates to the technical field of electroacoustic transduction. Disclosed in the present invention are a sound production unit and an electronic device. The sound production unit comprises a housing and a magnetic circuit system, which is arranged in the housing and comprises a magnetically conductive yoke, a central magnetic portion and a side magnetic portion, wherein the central magnetic portion and the side magnetic portion are arranged on the magnetically conductive yoke, and the side magnetic portion is arranged on an outer side of the central magnetic portion; the central magnetic portion comprises central magnetic steel and a central magnetically conductive plate, with two opposite sides of the central magnetic steel being respectively connected to the central magnetically conductive plate and the magnetically conductive yoke; the side magnetic portion comprises side magnetic steel and a side magnetically conductive plate, with two opposite sides of the side magnetic steel being respectively connected to the side magnetically conductive plate and the magnetically conductive yoke; the central magnetically conductive plate and / or the side magnetically conductive plate are / is made of a cobalt alloy material; and the magnetically conductive yoke is also made of a cobalt alloy material. A thinned design of the sound production unit of the present invention is realized, and the magnetic induction intensity of the magnetic circuit system is also effectively improved, thereby increasing the BL value, and thus the acoustic performance requirement of the sound production unit can be met.

A diffusion preparation method of a Fe-rich high-coercivity samarium-cobalt magnet belongs to the technical field of magnetic material preparation, solves the technical problems that the Fe-rich samarium-cobalt magnet is not easy to form a good cellular structure and the process flow is long, and comprises the following steps: S1, weighing a samarium-cobalt permanent magnet alloy raw material, and preparing an alloy ingot; s2, alloy particles are prepared through a mechanical crushing method, and the alloy particles are prepared into alloy powder; s3, the samarium-cobalt alloy powder is subjected to magnetic field orientation forming and cold isostatic pressing forming, and a green body is prepared; s4, performing sintering solution treatment on the green body to prepare a sintered samarium-cobalt permanent magnet blank, and processing the blank into a samarium-cobalt magnet sheet; s5, performing primary PrCu diffusion treatment on the samarium-cobalt magnet sheet; s6, the magnet sheet is subjected to secondary SnFe diffusion treatment; and S7, performing aging treatment on the secondary diffusion sheet to obtain the samarium-cobalt permanent magnet. The preparation method provided by the invention is easy to operate, control and industrialize, and the prepared Fe-rich sintered samarium-cobalt magnet is excellent in performance.

The invention relates to the technical field of cables, and discloses an anti-torsional fatigue and corrosion-resistant wind power cable and a manufacturing process thereof, the anti-torsional fatigue and corrosion-resistant wind power cable comprises a three-phase cable core main body, a dynamic compensation anti-torsion layer, a multifunctional corrosion-resistant barrier layer and an outer sheath, the three-phase cable core main body comprises a stranded conductor, a filling inner layer and an insulating layer; the dynamic compensation anti-torsion layer comprises an incongruous spiral supporting layer and a shape memory alloy compensation layer, and the incongruous spiral supporting layer comprises aramid fiber bundles and a nickel-cobalt alloy wire woven mesh; the multifunctional anti-corrosion barrier layer is arranged on the outer side of the dynamic compensation anti-torsion layer and sequentially comprises an anti-corrosion barrier bottom layer, an anti-corrosion barrier middle layer and an anti-corrosion barrier bottom layer surface layer from inside to outside. Through the gradient composite structure design, the problem of failure of a traditional wind power cable under long-term dynamic load and severe environment is effectively solved, and the torsional fatigue resistance, the corrosion resistance and the environmental adaptability are remarkably improved.

The invention provides a manufacturing method of a space converter of a probe card. The manufacturing method comprises the following steps: sequentially forming a titanium layer and a first copper layer on the upper surface of a ceramic substrate; forming a first circuit pattern on the upper surface of the first copper layer; forming a second copper layer on the first circuit pattern; removing the titanium layer and the first copper layer except the titanium layer below the second copper layer; sequentially forming a nickel layer and a first gold layer on the upper surface of the structure; forming a polyimide layer on the upper surface of the structure; removing the polyimide layer on the upper surface of the target position of the first gold layer to form a second circuit pattern; forming a first nickel-cobalt alloy layer on the second circuit pattern, and then forming a third circuit pattern; forming a second nickel-cobalt alloy layer on the third circuit pattern, and then forming a fourth circuit pattern; forming a second gold layer on the fourth circuit pattern; and removing the photoresist to obtain the space converter. According to the manufacturing method of the space converter of the probe card, the installation position of the probe can be accurately adjusted, and the alignment precision of the probe is improved.

The invention relates to a pipeline ultrasonic guided wave detection system which comprises a plurality of detection units distributed in the circumferential direction of a pipeline, a tightening assembly is hinged between the head detection unit and the tail detection unit, a connecting assembly is hinged between the other adjacent detection units, each detection unit comprises a frame and a probe detachably fixed in the frame, and two supports are arranged on the two sides of the frame respectively. A guide rod is arranged in the support, a roller is mounted on the guide rod through a wheel carrier, a first spring is arranged between the wheel carrier and the support, the probe comprises a shell, and a bottom-layer insulating spacer, an annular permanent magnet, an upper-layer insulating spacer and a disc-shaped electromagnetic coil which are fixed in the shell, a rectangular hole is formed in the bottom wall of the shell, and strip-shaped stop blocks are arranged on the two sides of the rectangular hole respectively; the bottom insulation spacer is connected with a coupling patch through a flexible deformable body, the disc-shaped electromagnetic coil is connected with an industrial interface extending out of the shell, the flexible deformable body is made of silica gel, and the coupling patch is made of ferrocobalt. The device has the advantages of being simple in structure, convenient to operate and control, high in reliability and good in adaptability.

The present invention discloses a composite electroplating nickel-cobalt cathode hydrogen evolution catalyst and a preparation method thereof, wherein a double-sided sandblasted nickel mesh degreased with alkali solution is pickled and washed with water, then immersed in electrolytes of different concentrations, electroplated for a period of time under a three-electrode system, and after the electroplating is completed, it is washed three times with deionized water and calcined at high temperature to obtain a hydrogen evolution electrode catalyst with multiple active sites. Through the above manner, the present invention discloses a composite electroplating nickel-cobalt cathode hydrogen evolution catalyst and a preparation method thereof, and adopts a composite electroplating nickel-cobalt alloy method to prepare an electrocatalyst material with multiple active sites, which can not only effectively reduce production costs, but also can utilize the nickel-cobalt electrolyte to play a pore-forming role to increase the specific surface area of ​​the catalyst material, thereby increasing the active point of the catalyst and improving the catalytic activity of the catalyst.

A firearm suppressor is provided, including a tubular core, a baffle carried within the core, and a tubular mount. The core may be attached end-to-end to the mount. A cap may be attached end-to-end to the core opposite the mount. An intermediate member may be included, extending between the mount and the cap, and residing outboard of the core. The intermediate member may be welded to the mount and to the cap. The mount, the cap, and the intermediate member may be composed of one or more of titanium, aluminum, resins, polymers, composites, carbon fiber, and ceramics, whereas the core and the baffle may be composed of one or more of cobalt, nickel alloy, steel, stainless steel, and cobalt alloy.

The invention relates to a carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction, a catalyst, a preparation method and application thereof, and the scheme is innovated by the following steps: dipping conductive carbon black (such as ketjen black ECP600JD) and 60-70wt% phosphoric acid solution according to a solid-to-liquid ratio of 1g / (15-18) mL, preheating at 100-250 DEG C in an argon atmosphere, then carrying out a reaction for 10-100 seconds under the assistance of a microwave power of 100-600 W, and carrying out vacuum drying to obtain the carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction. The phosphorus content of the prepared carbon carrier material is 4-6wt%, and the graphitization degree of the carbon carrier material is improved (ID / IG value is 1.15-1.20). And after the platinum-cobalt alloy is further loaded, the particle size of the nanoparticles is uniform, the potential loss is only 3 mV after 5000 accelerated attenuation tests in the proton exchange membrane fuel cell, and the power density attenuation is reduced by 58%. The method has the advantages of quick reaction, low energy consumption, high corrosion resistance and the like, and the stability of the catalyst is remarkably improved.

The invention relates to the technical field of steel material surface protection, in particular to a method for plating nickel and cobalt on steel by combining direct current and pulse electrodeposition. Comprising the following steps: removing oil from a steel strip by adopting an electrochemical method to obtain an oil-removed steel strip; the oil-removed steel strip is activated, an oxide film on the surface of the base material steel strip is removed, and the pretreated steel strip is obtained; pre-plating a nickel plating layer on the pretreated steel strip by adopting direct-current electrodeposition; and plating a nickel-cobalt alloy layer on the nickel plating layer by adopting pulse electrodeposition. The nickel-plated cobalt steel strip prepared through the method has high corrosion resistance and punch forming capacity, the production efficiency is improved, and the industrial production requirement is met.

This invention relates to a method for synthesizing iron-cobalt alloy-doped carbon nanofibers for electrocatalysis using zinc oxide etching, belonging to the technical field of electrode materials and catalysts. The preparation method includes the following steps: 1) mixing DMF (dimethylformamide), PMDA (pyromellitic dianhydride), and ODA (4,4-diaminodiphenyl ether) in a certain proportion to prepare a PAA (polyamic acid) spinning solution; 2) preparing PAA nanofibers from the PAA spinning solution using an electrostatic melt-blowing device; 3) imidizing the PAA nanofibers using a programmed temperature rise method to obtain PI nanofibers; 4) impregnating the PI nanofibers in a salt solution; 5) carbonizing the impregnated PI nanofibers with a large number of metal ions on their surface in an inert atmosphere using a certain temperature rise program to obtain iron-cobalt alloy-doped carbon nanofibers. The iron-cobalt alloy-doped carbon nanofibers prepared by this method exhibit excellent performance as an ORR / OER bifunctional electrocatalyst and have wide applications.

The invention discloses a method for recovering platinum and palladium from high-cobalt nickel-containing carbonylation slag, and relates to the technical field of non-ferrous metal carbonylation metallurgy, the method comprises the following steps: S1, hydrogen reduction and activation; s2, feeding into a high-pressure carbonylation reactor; and S3, efficient carbonylation. According to the method, the carbonylation slag is subjected to hydrogen reduction activation treatment, nickel protoxide and cobalt oxide are changed into simple substance nickel, the simple substance nickel is fed into a carbonylation reactor for carbonylation under the protection of reducing gas or inert gas after activation treatment, 95% of Ni, 85% of Fe and 80% of Co are carbonylated to enter a gas phase after carbonylation, bonding of cobalt and a platinum solid solution is broken through carbonylation, and the nickel-cobalt-cobalt-cobalt-cobalt alloy is obtained. Nickel protoxide is difficult to dissolve in various strong acids and oxidizing acids, and a foundation is laid for further separation of base metals and non-metallic element sulfur from precious metals to produce high-grade platinum concentrate.

The invention provides a ruthenium-cobalt target material for forming a component gradient thin film, which comprises a target material unit and a back plate, the target material unit has different ruthenium-cobalt proportions, and the target material unit is prepared by uniformly mixing ruthenium powder and cobalt powder according to different atomic ratios, carrying out die forming and then carrying out hot isostatic pressing sintering, the target material units with two different component proportions are sequentially and alternately spliced and fixed on the back plate to form the ruthenium-cobalt target material. The ruthenium-cobalt target material is composed of two ruthenium-cobalt alloy target materials with different ruthenium-cobalt proportions, the ruthenium-cobalt target materials are fixed to the same back plate, and the gradient film with the ruthenium-cobalt components continuously changing in the film thickness direction can be formed by adjusting sputtering parameters under the condition that the target material is not replaced.

The invention discloses a high-temperature pipeline magnetostrictive guided wave sensor and a monitoring method, and relates to the field of ultrasonic nondestructive testing. According to the sensor, a wrinkled iron-cobalt alloy belt is used as a sensitive element, and the sensor is in dry coupling contact with a to-be-detected pipeline; the high-temperature-resistant static magnetic field coil is wound on the outer side of the aluminum pre-tightening ring in a solenoid mode, and a bias pulse excitation mode is adopted. Alternately winding the bottom end of the wrinkle structure of the wrinkle-type ferrocobalt alloy belt and the back surface of the belt material, controlling the wrinkle-type ferrocobalt alloy belt to excite a guided wave signal in a pulse section, and receiving the guided wave signal in a bias section; the dynamic magnetic field and the static magnetic field generated by the two groups of coils are perpendicular in direction, and torsional mode guided waves are generated in the high-temperature pipeline based on the reverse Weidmann effect. The sensor is easy to install and stable in performance, the whole structure is resistant to high temperature for a long time, and the engineering problem of high-temperature failure is solved. The method provided by the invention comprises the steps of optimizing pre-tightening force, pulse voltage and bias current parameters, so that the transduction efficiency is improved, and the capability of detecting new defects of the pipeline in high-temperature and variable-temperature states is enhanced.

The invention discloses a hydrogen-corrosion-resistant coating material for a hydrogen-rich electrolyte environment and a preparation method thereof, and relates to the technical field of hydrogen-corrosion-resistant coating materials, the coating material comprises the following components by weight: a metal matrix reinforcing material: 30%-50% of nickel and 5%-10% of cobalt; the ceramic particles comprise 10%-20% of aluminum oxide and 5%-15% of The coating material disclosed by the invention shows excellent corrosion resistance, wear resistance and hydrogen embrittlement resistance in a hydrogen-rich electrolyte environment. The nickel-cobalt alloy layer is kept stable at high temperature and high pressure, hydrogen permeation is blocked, and material degradation is prevented. Aluminum oxide and silicon carbide improve the hardness and wear resistance of the coating, and the coating is kept intact in temperature circulation. The rare earth elements yttrium oxide and cerium oxide enhance the oxidation resistance and hydrogen embrittlement resistance. And the dispersing agent and the cross-linking agent further improve the uniformity, compactness and adhesion of the coating, so that the coating is suitable for industrial parts in high-pressure and high-stress environments.

The present invention provides a hydrogenation catalyst for petroleum resin, the hydrogenation catalyst comprises a catalyst, the catalyst contains an active component main body expressed as a general formula of M1-M2 / SiO2-Al2O3, M1 is an alloy of Ni and Co, and the atomic ratio of Ni to Co is 2: 1-4: 1; m2 is a composite oxide of Mo and W, and the molar ratio of Mo to W is 1: 1-3: 1; and SiO2-Al2O3 is used as an aluminum silicate precursor and is subjected to hydrolytic condensation to form a composite carrier with a three-dimensional silicon-aluminum bond network structure. The invention relates to the technical field of petroleum resin catalysts. The surface of the carrier is anchored with double active components, namely nickel-cobalt alloy capable of efficiently cracking hydrogen and generating active hydrogen atoms and molybdenum-tungsten composite oxide capable of selectively adsorbing aromatic rings and sulfide molecules; and cracked hydrogen atoms can be quickly migrated to adsorption sites through the surface of the carrier, and aromatic ring hydrogenation saturation and deep removal of sulfur impurities can be synchronously realized, so that the working efficiency of the hydrogenation catalyst is effectively improved.

The invention discloses a preparation method of a micro-comb-tooth structure diamond grinding wheel with abrasive particle positive relief angles and the obtained diamond grinding wheel, and the preparation method comprises the following steps: step 1, preparing grooves which are arranged in order to form a certain array on the circumferential surface of a grinding wheel base body through precision milling, and directionally bonding diamond abrasive particles in the grooves by using conductive adhesive; nickel-cobalt alloy is deposited through a pulse electroplating method to achieve mechanical solidification of the abrasive particles; 2, the grinding wheel obtained in the step 1 is shaped through a pulse laser system, and effective control over the outer circumference run-out of the grinding wheel is achieved; 3, the abrasive particle positive relief angle, obtained in the step 2, of the grinding wheel is subjected to forming machining; and 4, micro comb tooth structure machining is conducted on the grinding wheel in the step 3.

The invention belongs to the technical field of electroplating, and particularly relates to palladium-cobalt alloy electroplating liquid as well as a preparation method and application thereof. The electroplating solution comprises a palladium salt, a cobalt salt, a component A, a component B, a component C, a complexing agent, a conductive salt, a surfactant, a pH regulator and water, the component A is one or more of benzenesulfonic acid and a benzenesulfonic acid derivative, and the derivative refers to at least one substituent group and / or corresponding salt on an aromatic ring; the component B is selected from one or more of compounds shown in the molecular formula I, and the component C is selected from inorganic salts with reducibility. According to the technical scheme provided by the invention, through the synergistic effect of the three added components, the palladium-cobalt alloy coating with low stress, high brightness and adjustable alloy ratio is obtained, and the technical blank is filled. R1-C is equivalent to C-R2 (I).

The invention relates to the field of preparation of metal nano materials, in particular to a preparation method of an iron-cobalt nano-alloy electrocatalyst, and solves the problems that in an existing iron-cobalt alloy preparation method, the requirement for reaction conditions is high, uniform small particle size cannot be synthesized, and the electrocatalytic performance is low. The preparation method comprises the following steps: uniformly dispersing an iron source and a cobalt source which are used as raw materials in different proportions in a water-alkali-alcohol-organic acid system, heating to a set temperature in a hydrothermal reactor, reacting for a period of time, cooling, cleaning and drying to obtain a cobalt-doped iron oxide precursor; and carrying out heat treatment on the oxide precursor in a tube furnace in a reducing atmosphere, and cooling to obtain the iron-cobalt nano-alloy electrocatalyst (the particle size is 10-20nm). The obtained nano-alloy particles are small in size, uniform in component and high in yield, efficient electrocatalytic reduction of nitrate radicals to prepare ammonia can be achieved in the water environment with the wide potential range, the wide electrolyte concentration and the wide nitrate concentration, and the large-scale application potential is achieved.

The invention belongs to but not limited to the technical field of dissimilar metal welding, and discloses a method and system for improving the erosion resistance of a laser cladding cobalt-based alloy coating. Carrying out surface pretreatment on the base material; preparing a cobalt-based alloy cladding layer through a laser cladding technology; and the clad material is subjected to stress relief annealing treatment. Through the key step of annealing treatment after laser cladding of the cobalt-based alloy, generation of micro cracks and defects in a cobalt-based alloy cladding layer is effectively reduced, and therefore the coating which is tightly combined with a base body, excellent in mechanical property and remarkably improved in erosion resistance strength is prepared. The invention further provides an effective solution for solving the problem that cracks are easily generated due to improper heating rate and heat dissipation conditions in the laser cladding process of the cobalt-based alloy, and the quality and reliability of a cladding layer are remarkably improved. The technical innovation is of great significance in promoting high-quality development of the manufacturing industry, especially in the aspect of prolonging the service life of key parts and improving the performance of the key parts.

The invention relates to the technical field of tungsten carbide coatings, and discloses a tungsten carbide composite coating and a preparation method and application thereof. The tungsten carbide composite coating comprises the following raw materials in parts by mass: 5-10 parts of modified tungsten carbide, 1-2 parts of nickel-cobalt alloy and 0.2-0.5 part of titanium carbide. The minimum corrosion rate of the tungsten carbide composite coating in a 3.5% NaCl corrosion medium can reach 0.009 g / m < 2 > h, the minimum corrosion rate of the tungsten carbide composite coating in a 0.1 mo l / L NaOH corrosion medium can reach 0.017 g / m < 2 > h, the minimum corrosion rate of the tungsten carbide composite coating in a 0.1 mo l / L H2SO4 corrosion medium can reach 0.025 g / m < 2 > h, and the tungsten carbide composite coating has good corrosion resistance; according to the tungsten carbide composite coating provided by the invention, the corrosion rate change rate is only 30.0% in a corrosive medium of 3.5% NaCl, the corrosion rate change rate is only 10.0% in a corrosive medium of 0.1 mo l / L NaOH, the corrosion rate change rate is only 10.0% in a corrosive medium of 0.1 mo l / L H2SO4, and the tungsten carbide composite coating has good high-temperature oxidation resistance.

The present invention relates to the technical field of electro-acoustic transduction, and disclosed in the present invention are a sound generation unit and an electronic device. The sound generation unit comprises a housing and a magnetic circuit system, wherein at least part of the housing is formed of a cobalt alloy material; the magnetic circuit system is arranged in the housing and comprises a magnetic yoke, a central magnetic portion and a peripheral magnetic portion; the central magnetic portion and the peripheral magnetic portion are both arranged in the magnetic yoke, and the peripheral magnetic portion is arranged on an outer side of the central magnetic portion; and the peripheral magnetic portion is connected to the housing. The present invention aims to provide a sound generation unit that meets the requirements of slim design and acoustic performance. The sound generation unit effectively increases the magnetic induction intensity of the magnetic circuit system while having the slim design, thereby improving the BL value, and meeting the requirements of the acoustic performance of the sound generation unit.

The invention relates to a tungsten-tantalum-nickel-iron-cobalt alloy and a preparation method and application thereof. Belongs to the technical field of tungsten heavy alloy preparation. The tungsten-tantalum-nickel-iron-cobalt alloy is composed of tungsten, tantalum, cobalt, nickel and iron, and the mass ratio of the tungsten to the tantalum to the nickel to the iron to the cobalt is (84-90): (1-10): (5.38-8.08): (2.31-3.46): (0.2-2). The preparation method adopts a powder metallurgy method, and the product is obtained through material mixing, cold isostatic pressing and vacuum sintering. The sintered tungsten-cobalt-nickel-iron-cobalt alloy obtained after optimization can obtain the tensile strength of 1260 MPa or above and the total elongation of 30% or above. The obtained product is excellent in performance, high in tensile strength and high in elongation, the problem that the elongation of the high-strength tungsten alloy is low is solved, and the application range of the tungsten alloy is widened.

A method for extracting metals from saprolite lateritic nickel ore, comprising: subjecting saprolite lateritic nickel ore to ore dressing and ore milling, so as to obtain lateritic nickel ore powder; mixing the lateritic nickel ore powder, water, an acid and a reducing agent and performing normal-pressure acid leaching, so as to obtain a leaching residue and a leachate; adding a soluble fluoride salt and sodium salt into the leachate so as to obtain a silicon-aluminum residue and a silicon and aluminum-removed liquid; adding a phosphorus source into the silicon and aluminum-removed liquid, and performing solid-liquid separation to obtain ferric phosphate and a post-iron-precipitation liquid; performing primary cyclone electrolysis on the post-iron-precipitation liquid, so as to obtain a zinc-chromium alloy and a post-primary-cyclone-electrolysis liquid; performing secondary cyclone electrolysis on the post-primary-cyclone-electrolysis liquid, so as to obtain a nickel-cobalt alloy, manganese oxide and a post-secondary-cyclone-electrolysis liquid; and adding sodium carbonate into the post-secondary-cyclone-electrolysis liquid to perform a precipitation reaction, so as to obtain magnesium carbonate and a post-magnesium-precipitation liquid. The method achieves short-process separation and extraction of different valuable metal elements such as zinc, chromium, nickel, cobalt and manganese from saprolite lateritic nickel ore, and is an economical, efficient, green and environment-friendly extraction technique.

The invention discloses a surface hardening method for a universal joint of a screw drill and the related universal joint. The method comprises the following steps: carrying out thermal refining and finish machining on a universal joint blank subjected to rough turning to obtain a universal joint body; after the universal joint body is preheated, spot welding is conducted on the tungsten-cobalt alloy block wrapped by the nickel-based brazing filler metal to the wear-resisting contact face at one end of the universal joint body; spraying and welding nickel tungsten carbide powder and nickel-coated boron carbide composite powder on the wear-resistant contact surface to form a hardened layer on the wear-resistant contact surface; after cooling, the spray welding working face is ground to the designed size; checking pores of the spray welding working surface after grinding, filling the pores with composite powder of nickel tungsten carbide powder and nickel-coated boron carbide, and heating and melting to seal and fill the pores; and after cooling, the universal joint is finely ground to the designed size. The wear resistance and the impact fracture resistance of the universal joint are greatly improved, so that the universal joint can be matched with other screw drilling tool parts resistant to the high temperature of 350 DEG C to jointly form a screw drilling tool resistant to the high temperature of 350 DEG C.

The invention discloses a copper-cobalt alloy / lanthanum hydroxide heterojunction catalyst and a preparation method and application thereof.The preparation method includes the steps that lanthanum-based perovskite oxide LaCu (1-x) CoxO3 is prepared through a sol-gel method, and x is equal to 0.1-0.5; laCu1-xCoxO3 is placed in hydrogen and argon mixed gas for reduction treatment, and the copper-cobalt alloy / lanthanum hydroxide heterojunction catalyst is obtained and used for preparing ammonia through electro-catalysis nitrate radical reduction. According to the preparation method, an in-situ dissolution strategy is adopted, a copper-cobalt alloy / lanthanum hydroxide strong interface coupled heterostructure is constructed, CuCo alloy nanoparticles provide high conductivity and rich active sites and form a heterostructure with La (OH) 3, the d-band center of the active sites is optimized through interaction of strong electrons, NO3 <-> adsorption and reaction intermediate stability are promoted, and the stability of the reaction intermediate is improved. The excellent electro-catalytic performance is realized.

The invention discloses a preparation method and application of a pine needle nanosheet composite copper-cobalt alloy phosphide hydrogen evolution catalyst, and relates to the technical field of electro-catalysis. The copper-cobalt alloy phosphide hydrogen evolution catalyst is obtained by adopting electrolyte containing a copper source, a cobalt source, a phosphorus source and an inorganic fluoride complexing agent, taking foamed nickel as a working electrode and carrying out electro-deposition by utilizing a constant voltage method. On the basis of low cost and a simple synthesis method, the electronic structure of the catalyst is adjusted, and the electron transfer efficiency and the stability of active sites are improved, so that an excellent water electrolysis hydrogen evolution effect is realized, and a new solution is provided for the development of the field of clean energy.

The invention particularly relates to preparation of a nitrogen-doped carbon fiber packaged tin-cobalt alloy nanoparticle material and application of the nitrogen-doped carbon fiber packaged tin-cobalt alloy nanoparticle material to a negative electrode of a lithium ion battery. Through electrostatic spinning and thermal reduction methods, the CoSn-C-N composite material with N-doped carbon nanofibers embedded in CoSn alloy is prepared, and the CoSn-C-N composite material is applied to the negative electrode of the lithium ion battery. A large number of gaps exist among the CoSn alloy particles, stress caused by Sn volume change can be effectively reduced, and volume expansion is relieved; the highly dispersed CoSn nano-alloy particles are completely packaged in the porous carbon fibers, a considerable buffer space is also provided for volume expansion, and the carbon nanofibers not only can prevent structural fracture in the circulation process, but also are beneficial to electrolyte permeation, improve mass and load transfer capacity and enhance reaction kinetics. The preparation method disclosed by the invention is simple in process, low in cost and easier for large-scale production, and the prepared CoSn-coated C-N composite material is excellent in cycle performance and rate capability in a lithium ion battery.

The invention discloses a metal organic framework derived carbon coated iron-cobalt alloy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an iron-based metal organic framework, phenanthroline, cobalt salt and an organic solvent into a precursor mixed solution, and performing solvothermal reaction and pyrolysis to obtain the iron-cobalt alloy catalyst. According to the preparation method disclosed by the invention, cheap and easily available raw materials are adopted, and the green and environment-friendly metal organic framework derived carbon coated iron-cobalt alloy catalyst which is large in specific surface area, rich in active sites, stable in structure and excellent in catalytic performance can be prepared through a mild solvent volatilization-calcination two-step method; the method can be used for advanced treatment of organic pollutant wastewater, can realize efficient removal of organic pollutants, and is high in use value and good in application prospect. According to the preparation method disclosed by the invention, the iron-based metal organic framework is directly used as an iron source, so that additional addition of iron salt is avoided, the risk of iron precipitation and impurity introduction is fundamentally eliminated, and pH regulation is not needed.

The application provides a preparation method of a platinum-cobalt alloy catalyst, which comprises the following steps: preparing a hexadecyl trimethyl ammonium bromide clear solution; preparing a platinum compound, a transition metal cobalt salt and a dimethyl imidazole dispersion solution; adding the dispersion solution into the hexadecyl trimethyl ammonium bromide clear solution in sequence, stirring, adding a carbon black, a ketchen black, a cabot black or a carbon nanotube slurry, and continuously stirring to obtain a mixed solution I; then centrifuging, vacuum drying and grinding the mixed solution I to obtain an intermediate powder; then performing a different temperature staged calcination on the intermediate powder under a reducing / inert atmosphere to obtain an ordered low platinum-cobalt alloy catalyst powder; and then performing an acid washing, suction filtration, vacuum drying and grinding on the ordered low platinum-cobalt alloy catalyst powder to obtain a catalyst product which can be used in a fuel cell. The platinum-cobalt alloy catalyst prepared by the application can be applied to a proton exchange membrane fuel cell as a cathode oxygen reduction catalyst, and the platinum-cobalt alloy catalyst can improve the utilization rate, catalytic activity and durability of the noble metal Pt in the fuel cell cathode ORR catalyst, and can reduce the manufacturing cost and use cost of the fuel cell.

The application provides a preparation method of a nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst. The method comprises the following steps: (1) stirring and mixing a nitrogen-doped carbon carrier with an alcohol solvent to obtain a uniformly dispersed system A; (2) uniformly mixing a metal precursor with an alcohol solution by ultrasonic mixing to obtain a uniformly dispersed system B; (3) uniformly stirring and mixing the system A and the system B, then performing oil bath heating, and then performing washing and drying to obtain a nitrogen-doped carbon-supported platinum-cobalt alloy; and (4) placing the product obtained in step (3) into a porcelain boat, annealing the product in an inert atmosphere at a high temperature, and cooling the product to room temperature to obtain the nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst. The nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst prepared by the method has a uniform particle distribution and exhibits good catalytic activity and stability in an oxygen reduction reaction (ORR) of a fuel cell.