43 results about "Cerium doping" patented technology

The invention belongs to the technical field of air power supplies, and relates to modification treatment of an oxide, in particular to a cerium oxide doped transition metal oxide and a preparation method thereof, an air cathode and an air power supply. The preparation method comprises the following steps: dissolving cerium salt, cobalt salt and manganese salt in water, uniformly mixing to obtain a mixed solution, adjusting the pH value of the mixed solution to 9-11, and carrying out a sedimentation reaction to obtain a sediment; and drying the precipitate, and calcining in an air atmosphere at 300 + / -10 DEG C for 2-4 hours to obtain the cerium oxide doped transition metal oxide. The cerium oxide doped transition metal oxide is cerium doped cobalt manganese oxide with a spinel structure, and the doping amount of cerium is 20 + / -1wt%. The cerium oxide doped transition metal oxide provided by the invention is applied to an air cathode as a catalyst, and has good stability and high catalytic activity. The performance of an air power supply containing the oxide is remarkably improved. The method for preparing the oxide provided by the invention is simple and easy to operate, and is suitable for large-scale production.

The invention relates to the technical field of power cables, and provides a corrosion-resistant power cable protection tube and a preparation method thereof. The corrosion-resistant power cable protection tube comprises the following components in parts by weight: 60-70 parts of polypropylene resin, 5-10 parts of a flame retardant, 10-15 parts of an inorganic filler, 2-4 parts of a lubricant, 1-2 parts of an anti-aging agent, 1-2 parts of a coupling agent, 4-7 parts of a flexibilizer and 1-4 parts of color masterbatch, the inorganic filler comprises cerium-doped rectorite. By means of the technical scheme, the problem that in the prior art, a power cable protection pipe is insufficient in corrosion resistance is solved.

The application provides a variable-price rare earth element doped black titanium dioxide catalyst and a preparation method and application thereof, and belongs to the technical field of environmental functional materials and water pollution treatment. The catalyst is prepared by a sol-gel method combined with calcination in a hydrogen-argon mixed atmosphere, with tetrabutyl titanate as a titanium source and lanthanum nitrate and cerium nitrate as rare earth doping sources. Lanthanum / cerium doping can effectively inhibit the generation of rutile phase in the black titanium dioxide, increase the specific surface area, narrow the band gap and construct oxygen vacancy defects, and significantly improve the photocatalytic activity. The preparation process is simple, the cost is controllable, the catalyst has a remarkable selective degradation effect on specific dyes, and an efficient solution is provided for dye wastewater treatment.

The present application relates to the field of hydrogen production by alkaline electrolysis of water, and discloses a cerium-doped nickel-iron-based composite catalytic material, a preparation method and application thereof.The cerium-doped nickel-iron-based composite catalytic material comprises a nickel foam substrate and a cerium-doped nickel-iron-based electrode layer coated on at least part of the nickel foam substrate.The mass ratio of cerium, nickel and iron in the cerium-doped nickel-iron-based electrode layer is 1:60-75:20-40.The average pore diameter of the cerium-doped nickel-iron-based electrode layer is 1-3 microns.The electrode layer of the cerium-doped nickel-iron-based composite catalytic material has an attenuation rate of less than or equal to 0.05 mV / h at 1000 h, and the amount of nickel element deposited is less than or equal to 2 micrograms per liter and the amount of iron element deposited is less than or equal to 100 micrograms per liter at 1000 h, thereby having excellent oxygen evolution activity and stability.

The invention discloses a preparation method and application of a cerium-doped CoTeO3 nano-cluster catalyst, and belongs to the technical field of chemical energy materials. The preparation process comprises the following steps: firstly preparing a metal salt solution and a NaHTe solution, dropwise adding the NaHTe solution into the metal salt solution, stirring, centrifuging, cleaning and drying to obtain the cerium-doped CoTeO3 nano-cluster catalyst. The cerium-doped CoTeO3 nano-cluster catalyst prepared by the invention is constructed by a chemical reduction method, the conductivity of the catalyst is remarkably enhanced by introducing transition metal telluride, and the electronic structure of active sites is further optimized by doping rare earth cerium. In an electrocatalytic oxygen evolution reaction (OER), the catalyst breaks through the energy barrier limitation of a catalytic reaction intermediate by introducing a lattice oxygen oxidation mechanism (LOM), shows excellent catalytic activity and stability, and shows a good industrial application prospect.

The application belongs to the technical field of solid-state batteries, and relates to a solid-state electrolyte of a solid-state battery, in particular to a cerium doped MOFs based composite solid-state electrolyte and a preparation method and application thereof. 4+ / Ce 3+ / Ce 4+ The application induces the rich Zr 4+ / Ce 3+ / Ce 4+ Multi-valence active centers, combined with the regulation effect of the interface ion flow of the graphite phase carbon nitride (g-C3N4) two-dimensional layered material, significantly improve the comprehensive performance of the composite polymer solid-state electrolyte, such as ion conductivity, electrochemical window, electrochemical stability and the like.

The invention belongs to the technical field of new energy materials, and relates to a preparation method for preparing a copper-doped carbon nanofiber coated cerium-doped manganous oxide composite material serving as a high-cycle-stability zinc positive electrode of an aqueous zinc ion battery by combining an electrostatic spinning method and high-temperature annealing.

This invention discloses a cerium-doped diatom-based silicon-carbon anode material, its preparation method, and its application, belonging to the technical field of lithium battery anode materials and their preparation. Using a diatom shell as a framework, a bio-doping method is employed. When the diatoms grow to the early logarithmic phase in a culture medium, cerium ammonium nitrate is added to the diatom culture medium for co-cultivation. The co-cultivated diatom shells are then calcined at high temperature to obtain the cerium-doped diatom-based silicon-carbon anode material. This invention employs a two-stage cultivation strategy, introducing cerium ammonium nitrate after the diatoms have reached the early logarithmic phase to avoid toxic inhibition during the growth-sensitive period. Simultaneously, it utilizes the efficient absorption and doping capabilities of diatoms during the active biomineralization phase, achieving a balance between high doping efficiency and structural integrity. This method utilizes the biomineralization capabilities of diatoms to achieve uniform elemental doping, resulting in a simple, low-cost, and environmentally friendly process; providing a new approach for the development of high-performance silicon-carbon anode materials.

The application relates to the technical field of magnets, in particular to a cerium-doped high-coercivity neodymium-iron-boron magnet and a preparation process thereof. In view of the problem that the existing cerium-doped magnet has insufficient coercivity and reduced remanence due to uneven distribution of cerium, the process comprises the following steps: fluorination treatment on the surface of a main phase powder, cold pressure forming in a magnetic field, electrophoretic deposition to build a cerium fluoride skeleton, step-by-step vacuum impregnation of cerium salt and a fluorine source, and degreasing, sintering and grain boundary heat treatment. The method controls the uniform enrichment of cerium at the grain boundary, forms a continuous and dense grain boundary phase, effectively improves the intrinsic coercivity, remanence and high-temperature stability, simultaneously improves the corrosion resistance and reduces the dependence on heavy rare earths.

The invention belongs to the technical field of tungsten material manufacturing, and particularly relates to a tungsten-cerium alloy wire and a preparation method thereof.The preparation method comprises the steps that a cerium-containing solution and ammonium paratungstate are mixed through a spray mixing method and dried, and a mixture is obtained; the mixture is calcined at the temperature lower than or equal to 900 DEG C and reduced in the hydrogen atmosphere at the temperature of 800-1050 DEG C, and cerium-containing tungsten powder is obtained; the cerium-containing tungsten powder is subjected to isostatic pressing forming, sintered for 1-1.5 h at the temperature of 1500-1600 DEG C in the hydrogen atmosphere and then sintered for 5-8 h at the temperature of 2300-2450 DEG C, and a tungsten rod is obtained; and the tungsten rod is subjected to rolling, electric pulse treatment, forging and wire drawing treatment, and the tungsten-cerium alloy wire with the diameter being 20-28 microns is obtained. The cerium element is uniformly distributed in the alloy wire through solid-liquid cerium doping; through the two-stage sintering process, the compactness and the mechanical property of the tungsten rod are improved; the prepared tungsten-cerium alloy wire has excellent tensile strength, high elongation and excellent fatigue resistance, and shows low edge breakage rate, low wire breakage rate and long service life in silicon nitride ceramic substrate cutting.

The present application relates to the technical field of lens mask, especially to a highway LED transparent lens mask and a preparation method thereof, which comprises the following components by weight: 80-90 parts of poly(methyl methacrylate)-b-poly(glycidyl methacrylate) block copolymer (PMMA-b-PGMA); 0.5-2.0 parts of nano-scale cerium-doped zinc oxide (Ce-ZnO) quantum dots; 5-10 parts of random ethylene-methyl acrylate-glycidyl methacrylate terpolymer; 1-3 parts of photochromic spiropyran derivative modified silica nanoparticles; and 1-3 parts of hyperbranched fluorinated polyether. The high light transmittance is ensured, and the active sites are provided through the PGMA block, which is conducive to the uniform dispersion and chemical bonding of other functional components. The nano-scale cerium-doped zinc oxide (Ce-ZnO) quantum dots are introduced to realize efficient ultraviolet blocking and light stability.

This invention discloses a cerium-doped InP-based single-photon avalanche detector for space communication and its fabrication method. The detector's epitaxial structure, from bottom to top, includes a substrate, an N-type buffer layer, an absorption layer, a band transition layer, an N-type charge layer, an intrinsic multiplication layer, an intrinsic InP layer, and a cerium-doped P-type contact layer. The core innovation lies in the dual radiation-resistant design of the Ce-doped P-type contact layer and the Ce-doped modified stacked passivation film. The fabrication method involves MOCVD epitaxial growth, spin-coating source diffusion to prepare the P-type contact layer, ICP etching and wet repair, magnetron sputtering doping, and electrode fabrication. This invention utilizes Ce's unique electronic structure to suppress radiation-induced defects and combines this with an SACM structure to optimize the electric field distribution, achieving low dark count rate, high detection sensitivity, and excellent neutron radiation resistance. The process is compatible with existing semiconductor production lines and is suitable for wafer-level mass production, meeting the high-reliability single-photon detection requirements of aerospace missions such as space laser communication and quantum key distribution.

The invention belongs to the technical field of electro-catalytic materials, and discloses a cerium-doped core-shell series catalyst, a preparation method and an application in preparation of ethylene by electro-catalytic reduction of carbon dioxide, the catalyst is an Ag coated Cu2O catalyst taking Ag as a core and cerium-doped Cu2O as a shell layer; wherein the mole percentage of Ce is greater than 0% to 10%, and the mole percentage of Ce is calculated based on the total mole number of Cu and Ce. The rare earth element cerium (Ce) is creatively introduced as a doping agent. Ce is famous for unique Ce < 3 + > / Ce < 4 + > redox pairs and excellent oxygen vacancy regulation and control capability, and is often used as an electronic auxiliary agent or a structure stabilizer in the field of catalysis. If Ce can be introduced into the Ag-coated Cu2O core-shell structure, the oxidation state of Cu is dynamically stabilized in the reaction process by utilizing the electron interaction between Ce and Cu, so that the catalytic active center is protected, and the stability and ethylene selectivity of the catalyst are improved.

The invention discloses a preparation method of a cerium-doped MnCO3-Mn2O3 composite material, and belongs to the technical field of aqueous zinc ion batteries. The preparation method comprises the following steps: dissolving a manganous nitrate aqueous solution, urea and cerium nitrate hexahydrate in purified water, and carrying out hydrothermal reaction, filtering, drying and calcining treatment to obtain the cerium-doped MnCO3-Mn2O3 composite material. The microstructure shows that the composite material is composed of micron-sized blocky cubes and spherical-like particles stacked by sheet layers, the micron-sized blocky cubes and the spherical-like particles are consistent in orientation and provided with triangular pyramid-shaped protrusions, and the spherical-like nanoparticles of 50-200 nm are evenly anchored on the surfaces and in gaps of the composite material. The directional anchoring structure is beneficial to construction of a continuous electron conduction network and exposure of a rich active interface to form a stable cerium-doped double-phase composite system, so that the reaction kinetic performance of an electrode is remarkably improved, and the electrochemical performance of the composite material is improved.

The invention provides a preparation method of a high-power and high-energy-density lithium iron phosphate material. The preparation method comprises the following steps: (1) preparing a lithium iron phosphate precursor; (2) precursor pretreatment: carrying out ball milling on the lithium iron phosphate precursor and a liquefied paraffin / polyvinyl chloride binder in a solvent, and carrying out vacuum drying to obtain a pretreated precursor; (3) cerium doping: mixing a cerium salt solution with the pretreated precursor, and then performing spray drying to obtain a cerium-doped precursor; (4) two-stage sintering: first-stage sintering: sintering the cerium-doped precursor in an inert atmosphere to obtain a sintered intermediate; and second-stage sintering: adding a titanium source into the sintering intermediate to obtain a mixture, and continuously sintering the mixture in an inert atmosphere to obtain the lithium iron phosphate material, wherein the sintering temperature of the first-stage sintering is higher than that of the second-stage sintering. The lithium iron phosphate material prepared by the preparation method disclosed by the invention has relatively high energy density and power density.

This invention discloses a cerium-doped nickel-iron layered double hydroxide supported on nickel foam, which is prepared from cerium-doped nickel-iron layered double hydroxide NiFeCe-LDH. NiFeCe-LDH is prepared in situ by one-step electrodeposition on the surface of nickel foam NF using a nickel source, an iron source, and a cerium source. The lattice spacing of the (012) and (018) crystal planes is increased to 0.27 nm and 0.21 nm, respectively; and oxygen vacancies are present within the lattice. The basic microstructure is a three-dimensional "micro-flower" nanocluster structure with uniformly grown open surfaces, wherein the nanocluster structure is formed by interwoven and interconnected nanosheets. When the cerium-doped nickel-iron layered double hydroxide supported on nickel foam is used as an OER catalyst for water electrolysis, at a current density of 50 mA cm⁻¹... ‑2 Under these conditions, the OER overpotential is 210–220 mV; at a current density of 100 mA cm⁻¹ ‑2 Under these conditions, the OER overpotential is 220–230 mV; at a current density of 50 mA cm⁻¹ ‑2 Under these conditions, when the running time is 120 h, the potential is 0.6-0.7 V; compared with the initial potential, there is no significant fluctuation, and the decrease is 2-4%.

The application discloses a preparation method of a high-density cerium-doped indium oxide target material, which comprises the following steps: wet ball milling of raw material powder to obtain an ICO slurry, granulation of the ICO slurry to obtain ICO granulated powder, first compression molding of the ICO granulated powder to obtain an ICO blank, degreasing of the ICO blank, multiple compression molding of the ICO blank to obtain an ICO green body, and sintering of the ICO green body to obtain the cerium-doped indium oxide target material; the raw material powder is composed of In2O3 coarse powder, In2O3 fine powder and CeO2 powder; the particle size of the In2O3 coarse powder is 120-300 nm, and the particle size of the In2O3 fine powder is 20-50 nm. The application solves the bottleneck problem of the preparation technology of the high-density ICO target material, and the obtained ICO sintered target material has excellent properties of high density, low resistivity and high strength, and the process flow is simple, low in cost, green and pollution-free, and is suitable for large-scale production.

The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to a preparation method of a high-consistency cerium-doped lutetium silicate crystal. The preparation method of the high-consistency cerium-doped lutetium silicate crystal comprises the following steps: (1) processing a cerium-doped lutetium silicate single crystal, so that the size of the cerium-doped lutetium silicate single crystal in at least one dimension is not greater than 20mm; and (2) placing the processed cerium-doped lutetium silicate single crystal in a high-temperature furnace, introducing an oxygen-containing atmosphere into the furnace, raising the temperature of the furnace to 1100-1400 DEG C, keeping the temperature for 30-120 hours, and then cooling to room temperature along with the furnace. Through the method which is simple in process, remarkable in effect and suitable for large-scale production, the cerium-doped lutetium silicate crystal high in consistency is obtained, and the light output and the energy resolution of the cerium-doped lutetium silicate crystal can be stably and repeatedly improved to the high level.

The application provides a method for improving sintering quality of lithium battery positive electrode material by using an insulating refractory, and the method comprises the following steps: forming an insulating material by using a cerium-doped lanthanum zirconate solid solution and a high-temperature binder, spraying the insulating material on the surface of the kiln wall and the kiln roof refractory of a sintering kiln to obtain a sintering kiln with the insulating refractory; compared with a conventional sintering kiln, the sintering kiln with the insulating refractory can isolate the pollution of metal ions in the refractory to the positive electrode material, and can also isolate the erosion and corrosion of the alkaline compound of the positive electrode material to the refractory, so that the qualified rate of the sintered positive electrode material is increased by more than 10%, the energy saving of per ton of positive electrode material is more than 15%, and the service life of the sintering kiln is increased by more than one time. The insulating material is applied to the sintering kiln for the lithium battery positive electrode material, and the bottleneck problem that has plagued the sintering of the positive electrode material is solved.

The invention provides a chiral electrochemical sensor based on beta-cyclodextrin / cerium-doped copper-based metal organic framework / carboxylated multi-walled carbon nanotube (beta-CD / Ce-doped Cu-MOF / MWCNTs-COOH), a preparation method of the chiral electrochemical sensor, and a detection method for carrying out chiral recognition on an ofloxacin enantiomer by using the sensor. According to the chiral electrochemical sensor, a glassy carbon electrode is used as a substrate, a composite conducting layer of a carboxylated multi-walled carbon nanotube (MWCNTs-COOH) and a cerium-doped copper-based metal organic framework (Ce-doped Cu-MOF) is modified firstly, and then a beta-cyclodextrin (beta-CD) chiral recognition layer is modified on the surface through an electrochemical polymerization method. According to the design, the electro-catalytic activity of the Ce-doped Cu-MOF, the high conductivity of the MWCNTs-COOH and the chiral selectivity of the beta-CD are integrated, so that a synergistic enhancement effect is generated. By utilizing the sensor and combining a linear sweep voltammetry (LSV), high-sensitivity and high-selectivity detection of levofloxacin can be realized. The method has the advantages of being simple in instrument, easy and convenient to operate, rapid in detection, high in sensitivity, high in selectivity, good in stability and the like, is suitable for rapid analysis of levofloxacin in pharmaceutical preparations, food and environmental samples, and has wide application prospects in the fields of drug quality control and safety monitoring.

The invention discloses a cerium modified ZIF-8 / wood composite material for selectively adsorbing VOCs as well as a preparation method and application of the cerium modified ZIF-8 / wood composite material, and belongs to the technical field of functional composite materials. According to the composite material, pretreated wood serves as a three-dimensional carrier, ZIF-8 nanoparticles formed by coordination of zinc ions, cerium ions and 2-methylimidazole are loaded through an in-situ growth method, and the molar ratio of zinc to cerium is 3: 1-6: 1. The preparation method comprises the following steps: wood alkali pretreatment, zinc ion adsorption, in-situ coordination reaction with a solution containing cerium and a ligand, and post-treatment. The pore channels and surface properties of ZIF-8 are effectively regulated and controlled through cerium doping, so that the composite material has high adsorption capacity and excellent selectivity on benzene, methylbenzene, xylene and formaldehyde, and especially can preferentially adsorb benzene; meanwhile, the material is of a block structure capable of being directly applied, the engineering problem of MOF powder is solved, the material is suitable for the fields of furniture manufacturing and air purification, and a new scheme is provided for VOCs source treatment.

The invention discloses a novel descaling process for ER70S-6 steel billets, and belongs to the technical field of metal material surface treatment. According to the process, an inorganic modified material pretreatment step is introduced before conventional high-pressure water descaling. The modified material is a cerium-doped ferrocobalt layered bimetal hydroxide-phosphate hybrid nanosheet, and is obtained through multi-step complex synthesis. The material is prepared into a suspension and then atomized and sprayed to the surface of a high-temperature steel billet, the catalytic activity of the material is activated by waste heat of the steel billet, so that the interior of compact oxide skin is subjected to redox and complexation reaction to be loosened and weakened, and then the compact oxide skin can be efficiently removed only by low-pressure water flow. The whole descaling process does not need strong acid, is energy-saving and environment-friendly, has no damage to a matrix, can be seamlessly integrated with an existing hot conveying and hot charging production line, and remarkably improves the surface quality and the production efficiency of the ER70S-6 welding wire steel.

The application belongs to the technical field of gas sensitive materials, and particularly relates to a cerium doped modified bismuth cuprate gas sensitive material and a preparation method and application thereof. The preparation method of the cerium doped modified bismuth cuprate gas sensitive material comprises the following steps: (1) adding a cerium source solution dropwise into a mixed solution of a copper source and a bismuth source, stirring uniformly, adding an alkaline substance as a precipitant, and stirring again to obtain a uniform suspension; (2) allowing the uniform suspension to react by warming; and (3) after the reaction is completed, performing solid-liquid separation, cleaning and drying the obtained solid, and thus the cerium doped modified bismuth cuprate gas sensitive material is obtained. The cerium doped modified bismuth cuprate gas sensitive material can help to solve or improve the problems of poor humidity resistance (failure when encountering water) and low response value when pure bismuth cuprate is used for detecting formaldehyde.

This application discloses a method for fabricating a cerium-doped hafnium oxide-based ferroelectric thin-film capacitor and the capacitor itself. The method includes: S1: selecting and cleaning a substrate; S2: depositing a bottom electrode layer on the substrate surface by magnetron sputtering in an inert gas atmosphere; S3: depositing a ferroelectric layer on the bottom electrode layer using atomic layer deposition with tetradimethylaminohafnium as a hafnium precursor, cerium tetramethylheptanediketone as a cerium precursor, and ozone as an oxygen source, at a deposition temperature of 250~300℃; controlling the ratio of hafnium precursor to cerium precursor. The pulse cycle ratio is adjusted to achieve a cerium doping concentration of 2-8 at% in the ferroelectric layer; the total number of atomic layer deposition cycles is controlled to achieve a ferroelectric layer thickness of 10-25 nm; S4: A top electrode layer is deposited on the ferroelectric layer by magnetron sputtering in an inert gas atmosphere; S5: The sample obtained in step S4 is rapidly annealed in a nitrogen atmosphere to obtain a cerium-doped hafnium oxide-based ferroelectric thin film capacitor; wherein the annealing temperature is 600-800℃ and the holding time is 30-60s.

The application discloses a preparation method of cerium-doped goethite adsorption material and application thereof. The cerium-doped goethite adsorption material Ce-FeOOH is composed of metal cerium Ce doped goethite FeOOH; the Ce doping amount is 1.5-10.9 wt%, Ce is loaded on the surface of FeOOH in the form of mixed valence of Ce(III) and Ce(IV), and the proportion of Ce(III) is 17.8-30.0%. The Ce-FeOOH adsorption material maintains excellent adsorption stability in extracellular antibiotic resistance gene eARGs contaminated water bodies in a wide pH range and high ionic strength. The controllable doping method solves the problems of limited adsorption capacity and pH sensitivity of traditional materials, has high efficiency and economy in the treatment of eARGs pollution in a complex salinity water environment, and provides an innovative solution for water eARGs pollution control.

The invention belongs to the technical field of photovoltaic cells, and provides a cerium-doped indium oxide-based evaporation target material and a preparation method and application thereof. The cerium-doped indium oxide-based evaporation target material is of a concentric cylinder structure and comprises a central cylinder and a hollow annular cylinder wrapping the periphery of the central cylinder, the central cylinder and the hollow annular cylinder share the same center, the central cylinder and the hollow annular cylinder are indium cerium oxide, but the cerium content of the central cylinder and the cerium content of the hollow annular cylinder are different, and the cerium-doped indium oxide-based evaporation target material comprises 95-98 wt% of indium oxide and 5-10 wt% of cerium oxide. 3-5 wt% of cerium oxide; in the hollow annular cylinder, the indium oxide accounts for 99-99.9 wt%, and the cerium oxide accounts for 0.1-1 wt%. The density of the target material is 4.169-4.226 g / m < 3 >, the resistivity is as low as 78.9-86.3 omega.cm, the evaporation efficiency and uniformity of the target material can be effectively improved, target material residues are avoided, and the utilization rate of the target material is improved.

The present application relates to the technical field of ceramic products, in particular to a daily-use environment-friendly ceramic product based on easy-to-clean functional glaze water modification and a preparation process, comprising the following steps: first, preparing a ceramic body, then coating the easy-to-clean functional glaze water on the surface of the ceramic body by spraying, with a glaze layer thickness of 0.2-0.4 mm, and finally sintering to form a daily-use environment-friendly ceramic product. The environment-friendly ceramic product is made of kaolin, sodium feldspar and other raw materials to form a ceramic body, and then an easy-to-clean functional glaze layer is formed by coating. The cerium doping liquid, the additive based on wollastonite and the modified graphene agent in the glaze water cooperate with each other to improve the ceramic product, which is easy to clean for a long time, stable in corrosion resistance and has remarkable durability effect.

The application belongs to the technical field of sodium ion batteries, and discloses a carbon nitride-coated sodium manganese pyrophosphate-based positive electrode material, a preparation method and application. The positive electrode material comprises a core and a coating layer arranged on the surface of the core, the core is cerium-doped sodium manganese pyrophosphate, and the coating layer is carbon nitride; the chemical general formula of the positive electrode material is Na b‑a Ce a Mn 2.9‑a (PO4)2P2O7 / C3N4, wherein 0.001<=a<=0.3 and 3.95<=b<=4.1. The carbon nitride-coated sodium manganese pyrophosphate is used to improve the electrical conductivity, and the cerium element is used to improve the ion conductivity. The cerium element optimizes the bulk electron / ion conduction in the positive electrode material and stabilizes the skeleton of the positive electrode material. The carbon nitride provides a high-speed electron channel and physical / chemical protection outside the positive electrode material, and solves the problem of poor rate performance of the sodium manganese pyrophosphate material in the prior art.

The invention provides a cerium-doped and polyethylene glycol-modified cobalt oxide supported catalyst as well as a preparation method and application thereof, and belongs to the technical field of electrocatalysts and electrochemical organic synthesis. The cerium-doped and polyethylene glycol-modified cobalt oxide supported catalyst comprises a cerium-doped and polyethylene glycol-modified cobalt oxide catalyst which is supported on a porous carrier in the form of nanoparticles. Cerium doping is carried out on cobalt oxide, when the cobalt oxide is subsequently applied to electrocatalysis to adipic acid, electron transfer between adsorbed cyclohexanol and the catalyst is enhanced, and the cyclohexanol conversion rate of the catalyst is increased; in addition, polyethylene glycol is used for modification, and enrichment and adsorption of cyclohexanol reactants by the surface of the catalyst are effectively enhanced.