46 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 a preparation method of a Prussian blue analogue (CoFe-PBA) and copper metal organic framework (HKUST-1) composite core-shell material and application of the composite core-shell material in oxygen evolution reaction (OER). The material is prepared through a step-by-step synthesis and composite process: firstly, synthesizing copper-based MOF (HKUST-1) and a ferrocobalt Prussian blue analogue (CoFe-PBA), then compounding the copper-based MOF (HKUST-1) and the ferrocobalt Prussian blue analogue (CoFe-PBA) through a solvothermal method to form a core-shell structure (HKUST-1-atCoFe-PBA), and further performing high-temperature oxidation and vulcanization treatment to obtain HKUST-1-atCoFe-O and HKUST-1-atCoFe-S materials. According to the composite material, the electron transmission efficiency and the catalytic activity are remarkably improved by utilizing the synergistic effect of multi-metal active sites of Cu, Co and Fe. No precious metal or strong corrosive reagent is used in the preparation process, the cost is low, and the green synthesis requirement is met. An electrochemical test shows that the OER overpotential of the optimized catalyst at the current density of 10mAcm is only 268mV, and the catalyst shows excellent catalytic performance. The material can be widely applied to the fields of water electrolysis hydrogen production and the like, and has important industrial application prospects.

The invention relates to the technical field of electrode materials, and particularly discloses a ferrocobalt oxalate / foamed nickel composite material and a preparation method and application thereof. Nanometer flower-shaped cobalt iron oxalate (CoFeC2O4) is loaded on a foamed nickel substrate through a simple coprecipitation method. Through the synergistic effect of components and morphology, the hydrazine oxidation reaction can be started at a lower overpotential, the reaction kinetics process is accelerated, meanwhile, the cathode hydrogen evolution reaction is promoted, and the efficiency of the whole water electrolysis hydrogen production system is synergistically improved; the chemical property of the ferrocobalt oxalate is relatively stable, and the structure and catalytic performance of the ferrocobalt oxalate can be maintained for a long time; in addition, the raw materials cobalt and iron are abundant in reserves, the cost is far lower than that of a noble metal catalyst, the preparation process is simple, the material can be prepared at the room temperature, industrial large-scale production is facilitated, the material shows huge application potential in the field of hydrazine oxidation assisted water electrolysis hydrogen production, and efficient and sustainable development of the hydrogen energy industry is expected to be promoted.

The invention relates to a preparation method and application of a thermal shock induced ferrocobalt double-doped metastable phase nickel / nickel oxide heterostructure (Co, Fe-Ni / NiO / NF) composite electrode. The preparation method comprises the following steps: cutting and cleaning the foamed nickel substrate; the preparation method comprises the following steps: growing a nickel-cobalt-iron layered double hydroxide nanosheet on a foamed nickel substrate through a constant-voltage deposition method; nickel-cobalt-iron prussian blue analogue nanoparticles grow in situ on the surface of the nickel-cobalt-iron layered double hydroxide nanosheet through an ion exchange method; and preparing the Co, Fe-Ni / NiO / NF composite electrode through a thermal shock method. The composite electrode has excellent catalytic activity and stability as a working electrode for hydrogen evolution and oxygen evolution reactions. The composite electrode can be directly used as a cathode and an anode of an anion-exchange membrane electrolytic cell to efficiently catalyze a full-water decomposition reaction at different temperatures, and the electrolytic cell can stably operate for 1000 hours and 240 hours under the current densities of 0.1 A cm <-2 > and 1.0 A cm <-2 > respectively, so that the composite electrode has a good application prospect.

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 discloses a preparation method of hydrangea-shaped cobalt coordination polymer / cobalt-iron layered double hydroxide nano-enzyme with five-enzyme simulation activity, which mainly comprises the following steps: preparing a Co HNFs (cobalt coordination polymer graded nanoflower) precursor from cobalt nitrate hexahydrate and pyridine-2, 5-dicarboxylic acid in a mixed solution of N, N-dimethylacetamide, methanol and water, and preparing the cobalt coordination polymer / cobalt-iron layered double hydroxide nano-enzyme with five-enzyme simulation activity. CoFe-LDH grows on the surface of the precursor through an etching method, the Co HNFs / CoFe-LDH composite material is prepared, the material is cheap in raw material, the preparation method is simple, the reaction energy consumption is low, the Co HNFs / CoFe-LDH composite material has a good industrial application prospect, and the catalyst has nano-enzymes with five enzyme activities, specifically oxidase, peroxidase and catalase, and has a good application prospect. The five natural enzymes such as superoxide dismutase and laccase have the same enzyme activity.

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.

The present invention discloses a nitrogen and selenium co-doped carbon cubic box-wrapped iron triselenide / cobalt iron alloy / nitrogen and selenium co-doped carbon composite material and a preparation method thereof. The composite material is prepared from cobalt nitrate, trisodium citrate, potassium ferricyanide, tris(hydroxymethyl)aminomethane and dopamine through room-temperature chemical precipitation, selenization and pyrolysis. The method of the present invention is simple and low in cost. The prepared composite material has a yolk-shell structure and can be expressed as Fe3Se4 / Co7Fe3 / NSeC@NSeC. When used as a negative electrode material for lithium-ion batteries, it has a high specific capacity, large rate performance, long cycle life and good stability, showing good electrochemical lithium storage performance.

The invention discloses a preparation method of a high-efficiency Na-modified solid solution catalyst and application of the Na-modified solid solution catalyst in a reaction for preparing high-carbon alcohol and co-producing high-carbon olefin from synthesis gas. The catalyst comprises a solid solution component and an auxiliary agent component, the solid solution component is a ferrocobalt solid solution, the auxiliary agent component is a sodium elementary substance or oxide, and a reaction active center is the ferrocobalt solid solution, cobalt and cobalt carbide or cobalt oxide species and the sodium elementary substance or oxide. The invention provides a preparation method and application of a novel Na modified ferrocobalt solid solution catalyst, the catalyst has high activity, high C6 + alcohol and C5 + olefin selectivity and stability, the operation temperature can be in a range of 200-350 DEG C, and the reaction pressure is in a range of 0.5-10 MPa. The catalyst is stable in structure in the reaction process, the preparation method is simple and easy to repeat, and industrial application is facilitated.

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.

The invention belongs to the technical field of non-ferrous metal secondary resource hydrometallurgy, and relates to a method for wet separation of ferrocobalt and preparation of iron oxide red. According to the method, the ferro-cobalt alloy is leached with low acid, the ferro-cobalt leach liquor with low iron ion concentration is obtained, iron precipitation can be directly conducted through the oxygen pressure hydrolysis method, the technical problem that iron and cobalt of the high-iron low-cobalt alloy are difficult to separate is solved, and high-valued utilization of iron is achieved in the form of iron oxide red.

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 a core loss calculation method and system for a full-speed-domain multiphase ferrocobalt motor, the multiphase ferrocobalt motor is decoupled to a fundamental wave sub-plane and a harmonic wave sub-plane through coordinate transformation, the core loss generated by low-frequency harmonic current is reduced by using a maximum six-vector SVPWM control strategy, and the control performance is improved; the magnetic density is obtained through the sideband harmonic current under the static coordinate system, the magnetic density is substituted into a traditional iron core loss separation formula, fitting is carried out again, and the iron core loss separation formula is obtained and used for formulating motor modulation strategies under different working conditions, so that the iron core loss generated by the high-frequency harmonic current is restrained, and the efficiency of a motor control system is improved.

The invention discloses an NF / CoFeS-CoP-FeP composite material with a three-phase heterostructure, which is prepared by taking foamed nickel as a substrate and a self-supporting framework, taking cobalt nitrate hexahydrate and iron nitrate nonahydrate as raw materials, taking thiourea as a sulfur source, growing partially vulcanized ferrocobalt sulfide and ferrocobalt hydroxide on the foamed nickel, and then taking sodium hypophosphite as a phosphorus source to prepare the NF / CoFeS-CoP-FeP composite material with the three-phase heterostructure. The ferrocobalt hydroxide is converted into ferrocobalt phosphide; the Co8FeS8 is of a spherical magic cube-shaped structure; co2P is of a spherical nano sheet structure; the Fe2P is of a nano sheet structure; co8FeS8 and Co2P are combined with Fe2P to form a three-phase heterostructure. The preparation method of the NF / CoFeS-CoOH-FeOH composite material comprises the following steps: 1, preparing NF / CoFeS-CoOH-FeOH; and 2, preparation of the NF / CoFeS-CoP-FeP is carried out. When the NF / CoFeS-CoP-FeP composite material is applied as a hydrogen evolution catalyst material, the NF / CoFeS-CoP-FeP composite material reacts in a 1M KOH solution, and in a range of 0 to-0.1 V, when the current density is 10mA. Cm <-2 >, the overpotential of the NF / CoFeS-CoP-FeP is 61 to 67 mV, and the Tafel slope is 99.51 to 105.23 mV. Dec-1; and the current retention rate of NF / CoFeS-CoP-FeP is 98% under the condition that the cycle time is 24 h.

The invention relates to the technical field of electrocatalytic hydrogen evolution, and discloses a method for neutral electrocatalytic hydrogen evolution. The ferrocobalt bimetallic phosphide nanosheet material is used as a hydrogen evolution working electrode, neutral electro-catalytic hydrogen evolution is carried out in neutral electrolyte or neutral simulated seawater, and the ferrocobalt bimetallic phosphide nanosheet is of a nanosheet stacked structure and is good in dispersity; the nanosheet is thin and smooth, the thickness of the nanosheet is 50-200 nm, and the size of the nanosheet is 2-3 microns. The method provided by the invention can be used for producing hydrogen by electrolyzing water in a neutral environment, is free from the problem of corroding an electrolysis device, and has the capability of continuously working under relatively high current.

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 invention discloses a specially vulcanized CoFe prussian blue as well as preparation and application thereof. The porous three-dimensional graded non-noble metal sulfide catalyst is prepared by taking a ferrocobalt Prussian blue analogue as a template through calcination treatment and vulcanization. The catalyst is of a cubic porous structure, has high porosity and good conductivity, and has excellent hydrogen evolution and oxygen evolution electrocatalytic activity in an alkaline medium. The invention aims to provide a Prussian-blue-like electrocatalyst subjected to special vulcanization, the Prussian-blue-like electrocatalyst is used as a working electrode for an electrochemical test, the result shows that the Prussian-blue-like electrocatalyst has good electrocatalytic activity, the OER overpotential is as low as 237 mV and the HER overpotential is 156 mV when the Prussian-blue-like electrocatalyst is 10 mA cm <-2 >, and the Prussian-blue-like electrocatalyst also shows good stability in an alkaline solution.