26 results about "Ferrocobalt" patented technology

A laminated core comprising a plurality of segments is provided. The segments each comprise a plurality of soft magnetic lamination sheets that are stacked one on top of another in a direction of stacking and attached to one another by means of a first connection type to form a segment. The segments are attached by means of a second connection type to form a laminated core, the first and second connection types being different.

The invention discloses an iron-cobalt spinel oxide, which is prepared by the following steps: with ferric salt and cobalt salt as raw materials, dissolving the ferric salt, the cobalt salt and sodium acetate in an ethanol aqueous solution to obtain a precursor solution, carrying out hydrothermal treatment on the precursor solution, and washing and drying a reaction product to obtain the iron-cobalt spinel oxide. The iron-cobalt spinel type oxide is stable in crystal structure, the leaching rate of metal ions is remarkably reduced due to existence of metal-oxygen bonds, the recycling rate is increased, and meanwhile the risk of secondary pollution of water is reduced. In the process of degrading nitrogen-containing organic wastewater by an advanced oxidation technology for generating sulfate free radicals based on peroxymonosulfate, the iron-cobalt spinel type oxide has good catalytic performance, and can basically complete degradation of multi-nitrogen organic pollutants in water; and the method has relatively strong capability of resisting interference of inorganic ions and organic matters, and has relatively great application potential in actual wastewater treatment. The invention also discloses a method for degrading the multi-nitrogen explosive wastewater by using the ferrocobalt spinel type oxide.

The invention belongs to the technical field of electrocatalytic nitrate reduction synthesis of ammonia, and particularly relates to a preparation method of a cobalt-iron alloy catalyst, which at least comprises the following steps: 1, preparing a cobalt-iron oxide precursor by adopting an epoxide gel method; and 2, mixing the cobalt-iron oxide precursor powder obtained in the step 1 with an alcohol solvent, water and a Nafion solution, carrying out ultrasonic treatment to prepare ink, spraying the ink on a current collector, and then carrying out electroreduction on a loaded cathode material with a constant current in an electrolyte protected by argon to generate the cobalt-iron alloy catalyst. Compared with the prior art, the CoxFey alloy catalyst with a lattice expansion effect and an adjustable electronic structure is prepared by combining an alloying strategy with an in-situ electrochemical reduction method, so that the problem of adsorption-activation imbalance of an intermediate of a Co-based catalyst in a low-concentration NO3 <-> environment is relieved, and the practical process of electro-catalysis NO3 <-> RR for low-concentration NO3 <-> wastewater treatment is accelerated.

In embodiments herein, a surface finish (SF) is formed on conductive contacts of a package substrate for connection to an embedded interconnect bridge circuit module die. In some embodiments, the SF may be electroless nickel plating and electroless palladium immersion gold (ENEPIG). In other embodiments, SF may be gold leaching electroless palladium leaching (IGEPIG). In other embodiments, the SF may include an electrolytic palladium gold layer on the indium layer or on the ferrocobalt layer.

A new MRAM memory cell and a manufacturing method therefor, which relate to the field of data storage. The method includes: sequentially including a reference layer, a magnesium oxide tunnel layer and a free layer in a stacking direction. The free layer sequentially includes an interfacial PMA free layer, a free spacer layer and a bulk PMA free layer in a stacking direction, wherein the interfacial PMA free layer is disposed on the surface of the magnesium oxide tunnel layer; the free spacer layer is configured to ferromagnetically couple the interfacial PMA free layer and the bulk PMA free layer; and the interfacial PMA free layer is at least one of a cobalt-containing alloy layer, an iron-containing alloy layer and a cobalt-iron alloy layer, and the bulk PMA free layer is a manganese-based ternary tetragonal alloy layer. In the present invention, an interfacial PMA free layer and a bulk PMA free layer are combined to provide a higher TMR. In addition, a new manganese-based ternary tetragonal alloy is also used as the bulk PMA free layer, which improves the process compatibility and also improves the data retention capability of a device.

The invention discloses a preparation method of a spinel / diatomite nano composite material with high oxygen vacancy. The preparation method comprises the following steps: S1, obtaining purified diatomite; s2, dispersing Fe (NO3) 3.9 H2O, Co (NO3) 2.6 H2O and the purified diatomite in an HNO3 solution, then dropwise adding a NaOH solution, and stirring to obtain a precursor; s3, performing hydrothermal synthesis reaction on the precursor under microwave radiation to obtain a reaction product; and S4, carrying out centrifugal washing, vacuum drying and grinding on the reaction product to obtain the high-oxygen-vacancy ferrocobalt spinel / diatomite nano composite material. The nano composite material has higher oxygen vacancy content and higher specific surface area, is applied to persulfate oxidation treatment of sewage as a catalyst, and synchronously excites the dielectric-magnetic loss synergistic effect and catalytic active sites of the material under the dual synergistic effect of the catalyst and microwaves, so that the photocatalytic activity of the material is improved. Efficient activation of persulfate and continuous generation of free radicals are achieved, and then deep purification of sewage containing diuron and other refractory organic pollutants is achieved.

This invention provides a method for preparing nickel hydroxide / cobalt-iron alloy nanosheet electrocatalysts and their applications. The method involves dissolving FeSO4·7H2O, CoSO4·7H2O, NH4H2PO4, and Na3(C6H5O7)·2H2O in deionized water to form a mixed solution; using nickel foam as the working electrode and the mixed solution as the electrochemical deposition solution for constant current cathode deposition for a certain period; then washing the obtained sample with deionized water and drying it to obtain the cobalt-iron alloy electrocatalyst; placing the obtained cobalt-iron alloy electrocatalyst in a nickel nitrate solution to allow it to spontaneously and uniformly corrode in the solution for a certain period; after corrosion, washing and drying the sample to obtain the nickel hydroxide / cobalt-iron alloy nanosheet electrocatalyst. The morphology, catalytic activity, and oxygen evolution stability of the prepared catalyst are all significantly improved. The nickel nitrate corrosion method proposed in this invention has advantages such as low cost, low energy consumption, and ease of large-scale production. Furthermore, this method is versatile in preparing excellent transition metal OER catalysts and shows great promise for industrial application in the field of water electrolysis for hydrogen production.

The invention belongs to the technical field of environmental functional materials, and discloses a preparation method and application of an oxygen-vacancy-enriched ferrocobalt spinel and carbon core-shell microreactor. According to the method, a cobalt-iron spinel and carbon core-shell catalyst with rich oxygen vacancies is constructed through a defect engineering and morphology engineering synergistic strategy, and peroxymonosulfate (PMS) is efficiently activated to degrade antibiotics in water. The method specifically comprises the following steps: synthesizing a ferrocobalt spinel-carbon core-shell structure by adopting hydrothermal, metal ion adsorption and pyrolysis processes, and introducing oxygen vacancies through KBH4 reduction to optimize electron transfer and catalytic activity of the ferrocobalt spinel-carbon core-shell structure. The carbon nucleus in the obtained catalyst effectively enriches pollutants and PMS, and the confinement effect shortens the migration path of active oxygen species; and the PMS activation efficiency is obviously improved by the introduced oxygen vacancies. The catalyst is efficient when used for degrading antibiotics such as ciprofloxacin, has the advantages of high reaction rate constant, high removal rate, wide pH adaptability, strong anti-interference capability, low metal leaching and the like, and has a wide application prospect in the field of environmental governance.

A phase unit 1 for an electric machine 3, the phase unit comprising a first carrier plate 10A and a second carrier plate 10B, a coil 13 arranged between the first plate 10A and the second plate 10B, and magnetic cores 11A-11D fixed to the first plate and the second plate and retaining the coil. The magnetic cores are respectively segmented into a first part fixed to the first carrier plate and a second part fixed to the second carrier plate. The first and second parts may respectively comprise a soft-magnetic compound where the compound may comprise soft-magnetic powder held together by a non-magnetic binder. The soft-magnetic powder may comprise a nickel-iron alloy or a cobalt-iron alloy. The first parts may be engaged with the respective second part via a form fit. A gap may be formed between the first and second parts of a respective magnetic core. A respective first part may be separated from the corresponding second part along a segmentation line where the segmentation line comprises a step or a protrusion. The first part and the corresponding second part together may form a ball joint. The phase unit may be configured for driving a rotor of the electric machine that may be a transverse flux machine used in an electric propulsion unit for an aircraft.

The invention discloses a preparation method and application of a one-dimensional carbon-coated ferrocobalt microsphere self-assembled fiber, and belongs to the technical field of electromagnetic wave absorbing materials. According to the preparation method, nitrilotriacetic acid, cobalt ions and iron ions are subjected to chelation and hydrothermal treatment to generate a one-dimensional precursor, and the one-dimensional precursor is carbonized at high temperature to obtain the one-dimensional carbon-coated cobalt-iron alloy microsphere self-assembled fiber, so that the capacity of metal ions in the precursor is improved due to a multi-tooth structure of nitrilotriacetic acid, and the performance of the carbon-coated cobalt-iron alloy microsphere self-assembled fiber is improved. The magnetic particles in the derived one-dimensional carbon-coated ferrocobalt microsphere self-assembled fiber are good in dispersity and high in load rate; therefore, the magnetic loss capability of the composite material is obviously improved, and the effective absorption bandwidth of the composite material is widened; due to the excellent magnetic loss capability brought by the unique ferrocobalt alloy in a high-load and high-dispersion state, the performance index of effective absorption bandwidth is obviously improved, and the dielectric loss, matching impedance and reflection loss characteristics of the wave-absorbing material are effectively improved.

The present invention relates to a magnet assembly and a camera actuator including same and, more specifically, to a magnet assembly and a camera actuator including same, the magnet assembly having a yoke which contacts the lower surface and left side of a magnet unit and is made of a Co-Fe alloy. To solve the technical problem, the magnet unit includes a plurality of magnets which may be arranged in a Halbach array.

The application relates to the field of data storage, in particular to a novel MRAM storage unit and a manufacturing method thereof, which comprises a reference layer, a magnesium-containing oxide tunnel layer and a free layer in sequence in a stacking direction; the free layer comprises an interface PMA free layer, a free spacer layer and a bulk PMA free layer in sequence in the stacking direction; the interface PMA free layer is arranged on the surface of the magnesium-containing oxide tunnel layer; the free spacer layer is used for ferromagnetic coupling of the interface PMA free layer and the bulk PMA free layer; the interface PMA free layer is at least one of a cobalt-containing alloy layer, an iron-containing alloy layer and a cobalt-iron-containing alloy layer; and the bulk PMA free layer is a ternary tetragonal alloy layer of manganese. The application combines the interface PMA free layer and the bulk PMA free layer, provides higher TMR, and further adopts a novel ternary tetragonal alloy of manganese as the bulk PMA free layer, improves process compatibility and improves the data retention capability of the device.

The invention discloses a ferrocobalt bimetallic oxide catalyst as well as a preparation method and application thereof, and belongs to the technical field of electro-catalytic materials. The method comprises the following steps: dissolving a metal salt containing a cobalt source and an iron source in water to obtain a cobalt-iron bimetal salt solution; uniformly mixing the FeCo metal salt precursor with a carbon suspension, and evaporating a solvent to obtain a FeCo metal salt precursor loaded on the carbon source; and under the protection of nitrogen, applying constant current to the precursor, introducing H2O / N2 mixed gas with the volume fraction of 1-5%, and carrying out heat treatment to obtain a CoFe2O4 / C nano composite material prepared through hydrothermal-electrostatic field synergy, namely the ferrocobalt bimetallic oxide catalyst. The CoFe2O4 / C nano composite material with low crystallinity, small particle size, high electrochemical active area, rich surface oxygen species, high-proportion high-valence active sites and rapid charge transfer capability is prepared, so that the catalytic activity and stability of oxygen evolution reaction are remarkably improved.

The invention discloses an iron-doped ferrocobalt phosphate difunctional electrocatalyst and a preparation method thereof, belongs to the technical field of electrocatalyst preparation, and aims to solve the technical problem that the stability, conductivity and durability of the ferrocobalt phosphate difunctional electrocatalyst in the prior art need to be further improved. The graphene foam nickel-based electrocatalyst comprises the following components in parts by weight: 80-100 parts of a graphene foam nickel substrate and 44-69 parts of a precursor solution, and is prepared by modifying an electrocatalyst through pure foam nickel with positive charges, graphene oxide dispersion liquid with negative charges and a microwave-assisted hydrothermal method. The initial potential of hydrogen evolution reaction and oxygen evolution reaction is reduced, the current density is increased, and the service life is prolonged.

The invention discloses a circulation-type photoelectric synergistic catalytic filtration system for removing new pollutant wastewater by efficiently activating molecular oxygen, which has multiple advantages of efficiently activating molecular oxygen, realizing photoelectric synergistic interaction and enhancing mass transfer by a flow system, and is beneficial to realizing efficient removal of new pollutants. The circulation type photoelectric synergistic catalysis filtering system comprises a shell, a negative electrode, a positive electrode and an interlayer, wherein an anode, a non-woven fabric interlayer, a cathode and a sealing ring are sequentially arranged in the shell; wherein the anode is a bismuth oxybromide / carbon nitride / samarium-bismuth vanadate photoelectrode, and the cathode is a ferrocobalt diatom confinement carbon nanotube electrode; the broadband spectral response material and the novel catalyst design significantly improve the anti-interference performance, and adapt to complex water quality and low-concentration pollution scenes. New pollutant wastewater can be efficiently removed after being illuminated and electrified in the circulation type photoelectric concerted catalytic filtration system in a circulation flow mode, and the removal rate of ibuprofen within 2 hours can reach 96%. The method is simple in design, easy to operate, low in cost and small in energy consumption, solves the problems of low removal efficiency, high energy consumption and the like of a common treatment system, further reduces the operation cost in cooperation with solar full spectrum utilization and low catalyst dosage design, and shows the comprehensive advantages of high efficiency, stability, economy and environmental protection.

The invention discloses preparation and application of a self-supporting electrode based on porous ferrocobalt layered double hydroxides, an electrode material is a composite material formed by loading the porous ferrocobalt layered double hydroxides (CoFe-LDH) on foamed nickel (NF), the composite material is recorded as CoFe-LDH / NF, the molar ratio of cobalt to iron is 1: 3, 2: 2 or 3: 1, the electrode is used as the self-supporting electrode to be applied to a supercapacitor, and the self-supporting electrode is used for supporting the supercapacitor. The electrode is prepared through a one-step hydrothermal method, in a Raman spectrum, when the potential is increased to 0.5 V from 0 V, the characteristic vibration peaks of M-OH (metal-hydroxyl) and M-O (metal-oxygen) are both weakened, and meanwhile, the vibration peak of iron / cobalt oxide appears along with the characteristic vibration peaks of M-OH (metal-hydroxyl) and M-O (metal-oxygen). And in the process of discharging from 0.5 V to 0V, the vibration peak of the iron / cobalt oxide gradually disappears, and the characteristic vibration peak intensity of the M-OH and the M-O is recovered to the intensity in the open circuit state. It is proved that Co2Fe2-LDH / NF has excellent stability and reversibility in the charging and discharging process as a supercapacitor electrode material.

The invention discloses a preparation method for in-situ growth of ferrocobalt-layered double hydroxides (LDH), CoFe-LDH and a nanosheet catalyst through an electro-deposition method and application of the ferrocobalt-layered double hydroxides, the CoFe-LDH and the nanosheet catalyst. The LDH is a two-dimensional layered anion intercalation clay mineral, is rich in hydroxyl, has an adjustable surface electron structure, alkalinity and coordinated unsaturated active sites, is a good candidate for nitrogen reduction and CO2 conversion catalysts, and has a huge application prospect in many catalysts. On the basis, the CoFe-LDH nanosheet is loaded on a required substrate through a simple electro-deposition method and is directly used as a cathode for synthesizing urea through electro-catalytic reduction of NO2 <-> and CO2, and a good effect is achieved.

The present application relates to a kind of biochar load cobalt iron alloy composite catalyst and its preparation method and application, with agricultural and forestry waste wheat straw and cobalt iron prussian blue derivative (CoFe-PBA) as precursor, by coprecipitation method and high-temperature calcination method, biochar load cobalt iron alloy (CoFe@BC) Composite catalyst is successfully prepared.Catalytic performance is explored by using tetracycline (TC) as target pollutant, with the catalyst activated persulfate (PMS) degradation TC.The catalyst can effectively and quickly activate PMS, and the degradation rate of TC is as high as 99.96%.After repeated use for 5 times, the degradation rate still remains above 70%.The present application provides a simple, low-cost strategy for preparing efficient PMS activator for antibiotic wastewater remediation.

The invention discloses a method for electrocatalytic reduction of nitrate by using a modified cobalt-iron layered double hydroxide electrode material, the modified cobalt-iron layered double hydroxide electrode material is used as a working electrode to carry out electrocatalytic reduction treatment on the nitrate, and the modified cobalt-iron layered double hydroxide electrode material comprises foamed nickel. The surface of the foamed nickel is loaded with copper-doped ferrocobalt layered double hydroxides, and the copper-doped ferrocobalt layered double hydroxides have oxygen vacancies. The modified ferrocobalt layered double hydroxide electrode material adopted by the invention has the advantages of high selectivity, high Faraday efficiency, high ammonia synthesis rate and the like, can convert more nitrate into ammonia under low voltage and low nitrate concentration, and has the advantages of high selectivity, high Faraday efficiency, high ammonia synthesis rate and the like when being used as a working electrode for treating nitrate. The method can realize efficient resource utilization under different nitrate concentrations, has the advantages of simple operation, mild conditions, environmental protection, low energy consumption, good applicability, high nitrate removal rate, good ammonia conversion effect and the like, and is high in use value and good in application prospect.

The present application relates to a kind of battery grade phosphorus iron preparation method of cobalt iron alloy acid leaching solution high pressure hydrolysis product as raw material, comprising the following steps: (1) cobalt iron alloy acid leaching solution high pressure hydrolysis product powder is added in deionized water, mixed and stirred again join phosphoric acid solution, after stirring evenly, obtain yellow mixed solution, heating reaction, filtration, obtain clear solution, control solution pH value is 1.10-1.20;(2) the clear solution obtained in stirring case, join the reducing iron powder, again join H2O2, continue stirring, again filter;(3) the solution obtained after filtering in step (2) is adjusted to the pH value between 2.85-3.50, obtain white precipitate and filter, wash, dry, i.e. battery grade phosphorus iron FePO4 Product.Compared with prior art, the method has the advantages of simple process route, low preparation cost and easy to enlarge, etc.

The invention relates to the technical field of oxygen reduction reaction catalysts, and provides a pH universal core-shell ferrocobalt bimetal oxygen reduction catalyst and a preparation method and application thereof. The invention reports a strategy of a core-shell structure ZIF, namely, ZIF-8 (ZnCo-ZIF coated Fe / ZIF-8) containing ferric acetylacetonate is grown outside a prepared ZnCo-ZIF core, so that the bimetallic catalyst Co coated Fe-NC rich in defects is prepared on layered porous nitrogen carbon. The Co-coated Fe-NC catalyst prepared by the preparation method disclosed by the invention shows excellent ORR electrocatalytic activity in an electrolyte with universal pH (Potential of Hydrogen), especially in a neutral medium. The core-shell ferrocobalt bimetal oxygen reduction catalyst prepared by the invention opens up a new breakthrough point for assembling a zinc air battery, and shows huge application potential and value.

The invention provides a ferrocobalt bimetal organic framework material as well as a preparation method and application thereof, and belongs to the technical field of hydrogen evolution catalysts. The organic amine alkaline regulator is added, so that carboxylic acid organic ligands are effectively coordinated with cobalt ions and iron ions; through the cavitation effect of ultrasonic treatment, the coordination reaction between cobalt ions and iron ions and carboxylic acid organic ligands can be accelerated, efficient mixing and homogenization can be achieved, cluster or gel is prevented from being formed under the effect of an organic amine alkaline regulator, and a more uniform precursor complexing system is formed; in addition, a large number of tiny and uniform crystal nucleuses can be induced to be formed through ultrasonic treatment, the formed crystal nucleus structure is closer to the final MOF crystal structure, good thermodynamic stability is achieved, the crystal nucleus can serve as seeds for follow-up crystal growth, crystal activation energy is reduced, and high crystallinity is achieved at the low hydrothermal reaction temperature.

The invention belongs to the technical field of electrocatalytic materials and clean energy, and discloses a sulfur-hydrophobic self-cleaning porous nanosheet array electrocatalyst as well as a preparation method and application thereof. The method comprises the following steps: (1) substrate pretreatment: carrying out ultrasonic cleaning on ferrocobalt foam by using acetone, ethanol and deionized water in sequence, blow-drying, and carrying out double-sided etching treatment by using a DBD plasma technology to obtain a PCFF; (2) electro-deposition of a copper layer: performing constant-potential electro-deposition of copper on the surface of the PCFF to obtain a CuCoFe / PCFF alloy precursor; and (3) hydrothermal vulcanization: performing vulcanization treatment on the CuCoFe / PCFF alloy precursor in a hydrothermal environment containing a sulfur source to obtain the CuCoFeS / PCFF electrode. The problems that an SOR electrode is prone to being passivated by sulfur and short in service life are solved, the low-cost and high-activity non-noble metal electrode preparation method is provided, and an electrode structure which can still keep stability under high current density is achieved.

The invention discloses an electro-catalysis cathode material suitable for nitrogen heterocyclic pesticide wastewater treatment and a preparation method and application of the electro-catalysis cathode material, a FeCo-C electro-catalysis material is composed of a cobalt-iron alloy and a one-dimensional carbon fiber substrate, and the FeCo-C electro-catalysis cathode material is prepared through the specific preparation method. Raw materials and solvents required for preparation are few in types, the process is simple, and controllability is high. And in the FeCo-C electro-catalytic cathode material, metal iron and cobalt mainly exist in the form of alloy and non-metal oxide. The FeCo-C electrocatalytic cathode material prepared by the method has excellent catalytic performance stability and reusability, is high in water matrix interference resistance and wide in applicable pH and pollutant concentration range, and can be effectively applied to efficient degradation of nitrogen heterocyclic pesticide.

The invention discloses a preparation method of an iron-cobalt-based magnetic matrix material and application of the iron-cobalt-based magnetic matrix material in immobilized trypsin, the material structure is controlled by changing the proportion of iron and cobalt and preparation conditions, porous iron-cobalt matrixes with different structures and morphologies are prepared, then the surfaces of the porous iron-cobalt matrixes are coated with silicon dioxide, and the iron-cobalt-based magnetic matrix material is prepared. And forming a silicon dioxide coating, performing alkali etching on the silicon dioxide coating to form small dents on the surface, and further performing pore expansion by using salts with different concentrations to prepare the iron-cobalt-based magnetic matrix material. And combining the iron-cobalt-based magnetic matrix material with trypsin to obtain the immobilized trypsin. The preparation method has the beneficial effects that the material preparation process is simple, the magnetism of the matrix material is strong and stable, and the surface area is large, so that the modification capacity of trypsin is improved, and meanwhile, the prepared immobilized trypsin has different pore structures and material morphologies, can realize rapid and efficient enzymolysis of protein, and has a magnetic separation effect.

The invention discloses a ferrocobalt bimetal hydrogen evolution catalyst and a preparation method and application thereof, and relates to the technical field of water electrolysis hydrogen production, the ferrocobalt bimetal hydrogen evolution catalyst comprises a Co-ZIF material and an Fe element freely dispersed in a cavity of the Co-ZIF material; based on the total weight of the catalyst being 100%, the weight percentage of the Co element in the catalyst is 32%-50%; the weight percentage of the Fe element in the catalyst is 1%-12%. The synergistic effect of the bimetallic active sites of the catalyst can improve the water electrolysis hydrogen evolution activity of the material and promote the transfer and transfer of electrons in the system, and the catalyst has excellent hydrogen evolution performance. Under the condition of 1MKOH, when the current density can reach 10mA / cm < 2 >, the hydrogen evolution overpotential of the working electrode can reach 177mV, the 12-hour attenuation rate can reach 1.58%, and the Tafel slope can reach 98mV / dec.