406results about "Cerium oxides/hydroxides" patented technology

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

The invention discloses preparation of a high-uniformity cerium oxide abrasive material and application of the high-uniformity cerium oxide abrasive material in a chemical mechanical polishing solution. According to a method, cerium nitrate or cerium oxalate is used as a cerium source, a cationic or nonionic surfactant is used as a structure-directing agent, and the high-uniformity cerium oxide abrasive material is prepared in a mixed solvent system formed by water and isopropanol or water and diethylene glycol according to a specific volume ratio. The preparation method comprises the following steps: regulating the particle size and the morphology structure through a solvothermal reaction, carrying out cleaning, drying and high-temperature calcination treatment on a reaction product to obtain sphere-like cerium oxide nano-particles with high particle size concentration ratio, moderate surface roughness and good dispersity, adding cerium oxide powder into deionized water, and carrying out ultrasonic dispersion to obtain the spherical cerium oxide nano-particles. And sequentially adding a dispersing agent and amino acid while stirring, uniformly stirring, fixing the volume, and adding a pH regulator to enable the solution to be weakly acidic, thereby obtaining the chemical mechanical polishing solution. The cerium oxide submicron powder which is different in surface appearance, particle size and distribution uniformity is prepared by adjusting the solvent ratio and other reaction conditions.

The invention discloses a synthesis method of a hydrazine dicarboxylate modified cerium dioxide abrasive, and belongs to the technical field of precise polishing materials. The method comprises the following steps: taking cerous nitrate as a raw material, and preparing a cerous carbonate precursor through an ammonium carbonate precipitation reaction; and grinding and calcining the obtained precursor and hydrazine dicarboxylate to obtain the CeO2 grinding material with the surface rich in oxygen vacancies. And Ce < 4 + > can be partially reduced into Ce < 3 + > by reducing fragments generated by decomposition of the hydrazine dicarboxylate in the calcining process, so that an oxygen vacancy structure is formed through induction, and the chemical activity and the reaction rate of the abrasive are improved. The obtained grinding material shows excellent performance in chemical mechanical polishing (CMP) of K9 glass, the material removal rate (MRR) is increased by about 3.6 times compared with that of unmodified CeO2, the surface roughness (Ra) is reduced to about 0.16 nm or below, and grinding material particles are good in dispersity and less in agglomeration. The used hydrazine dicarboxylate is stable, low in toxicity and mild in reaction, and the particle size can be prevented from excessively growing while the high oxygen vacancy concentration is kept.

The invention discloses a preparation method of monodisperse nano cerium oxide, and relates to the technical field of rare earth materials. The preparation method of the nano cerium oxide comprises the following steps: S1, adding hydrogen peroxide and a surfactant into a cerium salt solution, and uniformly stirring and mixing to obtain a pre-solution; s2, the pre-solution is adjusted to be in an alkaline environment through an alkaline solution, stirring is conducted for 0.5-1.5 h at the temperature of 60-90 DEG C, slurry is obtained, then suction filtration, washing, drying and calcination are conducted, and cerium oxide powder is obtained. The prepared nano cerium oxide particles are small in particle size, narrow in particle size distribution range and good in dispersity.

A particulate oxide composition comprising cerium oxide, trivalent dopant, and optional additional metal oxide, other than cerium oxide and trivalent dopant, is beneficial to aid in the removal of biological contaminants, such as bacteria, viruses, fungi, protozoa (e.g., amoebae), yeast and algae. This particulate oxide composition contains more cerium oxide than trivalent dopant and has a unique depth profile in which the average trivalent dopant to Ce ratio at about 0 nm to about 3.5 nm from the surface of the particulate composition is greater than the trivalent dopant to Ce ratio at about 15 nm from the surface of the particulate composition. These trivalent doped cerium oxide compositions can be used to remove these biological contaminants from fluids, including air and water, and from solid surfaces. Also described are methods of using compositions containing these trivalent doped cerium oxide compositions to remove biological contaminants.

The invention discloses an oxide-coated ion-doped sodium ferric sulfate positive electrode material as well as a preparation method and application thereof. The positive electrode material is formed by compounding a sodium ferric sulfate bulk phase material doped with various valence metal cations and anions and coated with carbon similar to a positive temperature coefficient thermosensitive metal oxide. Wherein the metal cations with various valence states are doped on Na or Na / Fe ion sites of the sodium ferric sulfate, the doped anions occupy part of three-dimensional S-O tetrahedron positions, the inorganic carbon in the carbon compound is uniformly distributed in the sodium ferric sulfate bulk phase material, and the organic carbon is uniformly distributed outside the sodium ferric sulfate bulk phase material. The positive electrode plate assembled battery prepared from the positive electrode material has the advantages of high reversible charge-discharge capacity, excellent cycle performance and rate capability and high electron and ion migration rate in a low-temperature environment. The method is low in raw material cost, simple in synthesis method, short in production period and suitable for large-scale continuous production.

The invention belongs to the technical field of preparation and application of nano materials, and relates to a preparation method and application of amino-functionalized cerium oxide nano enzyme, and the preparation method comprises the following steps: adding 3-aminophenylboronic acid into a cerous nitrate hexahydrate aqueous solution to obtain a mixed solution; dropwise adding a sodium hydroxide aqueous solution into the mixed solution, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing and drying to obtain milk white powder, namely the amino-functionalized cerium oxide nano-enzyme. The boron element is introduced in the preparation of the cerium oxide nano-enzyme, and the amino-functionalized cerium oxide nano-enzyme is prepared by adopting a simple one-step hydrothermal synthesis method, so that the nano-enzyme has good phosphatase-like activity, has high selectivity and sensitivity to LPS, and is short in detection time, high in sensitivity, low in detection limit, simple in preparation process and high in preparation efficiency; the product is good in quality, high in stability, environment-friendly and extremely wide in market prospect.

The invention discloses a preparation method of a wear-resistant magnetic composite nano ferroferric oxide material, and belongs to the technical field of nano ferroferric oxide materials.The preparation method comprises the steps that coated modified ferroferric oxide composite powder, silver nitrate and absolute methanol are added into a reaction kettle, stirring and ultrasonic dispersion are conducted, then 2-aminoterephthalic acid is added, stirring and mixing are conducted, and a mixture is obtained; and after the reaction, separating to obtain the wear-resistant magnetic composite nano ferroferric oxide material. The wear-resistant magnetic composite nano ferroferric oxide material prepared by the preparation method disclosed by the invention overcomes the problem that an existing ferrite material is relatively single in electromagnetic loss mechanism in the aspect of nickel-phosphorus plated fabric, and the electromagnetic shielding effectiveness of the fabric is improved; the coated modified ferroferric oxide composite powder has good dispersity, a polydopamine coating layer on the surface of the coated modified ferroferric oxide composite powder improves the anchoring effect on silver MOF particles through a mussel-like adhesion interface, meanwhile, stress is dispersed and crack propagation is reduced through the buffering effect of the polydopamine coating layer, and the mechanical stability of the wear-resistant magnetic composite nano ferroferric oxide material is improved.

The invention discloses a preparation method of a nano-porous CeO2 catalyst, and the preparation method of the nano-porous CeO2 catalyst comprises the following steps: S1, adding a cerium source into deionized water, and dissolving to obtain a cerium-containing aqueous solution; s2, adding a mixed solvent into the obtained cerium-containing aqueous solution, and uniformly stirring to obtain a mixed solution; s3, putting the obtained mixed solution into a reaction kettle for hydrothermal reaction, after the reaction is finished, centrifugally washing to obtain a solid substance, and then sequentially drying, conventionally grinding and calcining the obtained solid substance at high temperature to obtain the nano-porous CeO2 catalyst. The invention also provides a nano-porous CeO2 catalyst, and an application of the nano-porous CeO2 catalyst. Compared with the prior art, the preparation method of the nano-porous CeO2 catalyst has the advantages that the operation is simple, and the prepared nano-porous CeO2 catalyst has a good catalytic conversion effect on VOCs (Volatile Organic Compounds) and the like.

The invention discloses zwitterion co-doped CeO2 abrasive particles and a preparation method and application thereof.The preparation method includes the steps that a cerium source and a soluble carbonate precipitator are subjected to an aging reaction to obtain a cerium-based precursor, and the cerium-based precursor, fused salt, metal ions and a fluorinating agent are mixed and then roasted to obtain the zwitterion co-doped CeO2 abrasive particles; the synthesis method is simple, the size is controllable, the particle size distribution is uniform, and the spherical-like zwitterion co-doped CeO2 abrasive particles are obtained; the co-doped CeO2 abrasive particles have excellent photo-assisted chemical mechanical polishing performance; when the polishing solution prepared from the sphere-like co-doped CeO2 abrasive particles synthesized by the method is used for processing the surface of quartz glass, the material removal rate reaches 988.69 nm / min, and a high material removal rate is obtained due to the fact that the co-doped CeO2 abrasive particles synthesized by the two-step method shorten the forbidden bandwidth and have high chemical activity, so that the material removal rate is favorably improved.

The invention belongs to the field of water pollution treatment, and particularly relates to a method for degrading chlorophenol organic pollutants in water by activating persulfate with a cobalt-cerium dioxide monatomic catalyst in the presence of bicarbonate radicals. According to the invention, cerium nitrate hexahydrate is calcined in a muffle furnace to obtain cerium dioxide. A catalyst precursor is prepared by a traditional isovolumetric impregnation method. The prepared catalyst precursor is annealed at different temperatures to obtain a series of catalysts, the catalytic performance of Co1-CeO2-700 is optimal, and the Co1-CeO2-700 has more excellent catalytic performance in the presence of bicarbonate radicals. The preparation method provided by the invention has the advantages of simple steps, convenience in operation, quick effect of treating chlorophenol, high product yield and low cost, and has good economic value and social benefit. The prepared monatomic catalyst has the advantages of being high in atom utilization rate, good in stability, excellent in catalytic effect and the like, and is expected to become a key technology for solving actual water environment organic pollution.

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 battery positive electrode materials, discloses a manganese-based battery positive electrode material precursor as well as a preparation method and application thereof, and belongs to the technical field of battery preparation. According to the technology for preparing the manganese-based battery positive electrode material precursor, a solid-phase method is mainly adopted, a high-temperature melting technology is adopted, the manganese-based positive electrode material is subjected to doping modification through multiple elements at the same time, then surface coating is carried out, the density of the synthesized positive electrode material is improved, the structural stability of the synthesized positive electrode material is enhanced, and the morphology, the crystal face and the crystal boundary of the positive electrode material are optimized; the side reaction between the crystal interface of the positive electrode material and electrolyte is inhibited, the service life is prolonged, and the safety performance during use is enhanced. A small amount of water vapor and carbon dioxide gas generated in the preparation process are discharged at high altitude, so that the environment is not polluted.

The invention discloses a preparation method and application of CeO2 catalysts with different morphologies. The preparation method comprises the following steps: S1, pretreating to obtain a sample; s2, transferring the sample into a muffle furnace, and calcining at 400 DEG C for 4 hours at the heating rate of 2 DEG C / min; and S3, cooling and taking out to obtain CeO2 catalysts with different morphologies. According to the method, the catalysts with different morphologies including CeO2 nano particles, CeO2 nano square blocks, CeO2 nano rods and CeO2 nano hollow spheres are synthesized through the steps of pretreatment and calcination, the sizes of the catalysts are uniform, and the synthesis method is safe, convenient and high in repeatability. CeO2 catalysts with different morphologies are applied to a novel catalytic system, namely dielectric barrier discharge plasma synergistic CO2 conversion, and the reaction conversion rate and stability are good; the CeO2 nano hollow sphere synthesized by the method has a large number of oxygen vacancies, and the content of the oxygen vacancies is increased along with the proceeding of the reaction in the process of converting CO from dielectric barrier discharge plasma to CO2, so that the adsorption, activation and conversion efficiency of CO2 are obviously improved.

A polishing liquid for CMP, containing: abrasive grains; an additive; and water, in which the abrasive grains include cerium-based particles, a zeta potential of the abrasive grains is negative, the additive includes (A1) a 4-pyrone-based compound represented by General Formula (1) below, and a pH is 5.0 or more. A polishing liquid for CMP, containing: abrasive grains; an additive; and water, in which the abrasive grains include cerium-based particles, a zeta potential of the abrasive grains is negative, the additive includes (A2) a picolinic acid compound, and a pH is 5.0 or more.[In the formula, X11, X12, and X13 are each independently a hydrogen atom or a monovalent substituent.]

The invention discloses a copper-doped cerium oxide antifouling agent and a preparation method and application thereof.The antifouling agent takes cerium oxide as a main body material, copper is introduced for doping, Cu < 2 + > partially replaces Ce < 4 + > to enter crystal lattices, charge imbalance is caused, more oxygen vacancies are induced to be generated, meanwhile, reduction conversion from Ce < 4 + > to Ce < 3 + > is promoted, and formation of the oxygen vacancies is further stabilized. The oxygen vacancies obviously enhance the surface catalytic activity of the material, H2O2 and Br <-> in seawater can be efficiently catalyzed to generate hypobromous acid (HOBr) with a bactericidal effect, the function of natural halogenated peroxidase is simulated, and long-acting and environment-friendly biological antifouling is realized. The antifouling agent provided by the invention can be synthesized by adopting a hydrothermal method, is simple and convenient in process, is suitable for large-scale preparation, is suitable for various marine environment antifouling scenes such as hulls, marine engineering equipment and underwater sensors, and has a good application prospect.

Complexes of polyoxometalate (POM) cluster anions and metal oxide nanocrystal (NC) cores (POM-NC) with tunable NC surface protonation are disclosed. These protonated POM-NC complexes enable precise control over catalytic properties, enhancing catalytic activity under near-neutral pH conditions while improving stability and solubility across various applications. The protonated POM- metal oxide complexes facilitate the activation of airborne O2 under ambient conditions and the production of reactive oxygen species (ROS), including hydroxyl radicals, superoxide, and peroxides. In certain catalytic processes, these complexes mimic enzymatic functions, such as oxidase, peroxidase, catalase, and superoxide dismutase activity, making them valuable for various biological, therapeutic, chemical and environmental applications such as applications related to oxidative catalysis and ROS scavenging.

The invention relates to cerium dioxide and a preparation method and application thereof, and the preparation method of the hexagonal cerium dioxide comprises the following steps: (1) carrying out first mixing on cerium salt, doped metal salt, a solvent, inorganic acid and organic acid to obtain a first mixture; the doped metal salt comprises praseodymium salt and / or neodymium salt; (2) under a hydrothermal condition, carrying out second mixing on the first mixture, ammonia water and ammonium salt to obtain a second mixture with the pH value of 3.5-6, and carrying out sol-gel reaction to obtain hexagonal cerium dioxide sol; and (3) carrying out post-treatment on the hexagonal cerium dioxide sol to obtain the hexagonal cerium dioxide. According to the preparation method of the hexagonal cerium dioxide, provided by the invention, a mixing process and a reaction process of cerium salt and specific raw materials are designed, so that the hexagonal cerium dioxide with regular particle shape, good size uniformity and high purity and crystallinity is obtained.

A polishing liquid for polishing undoped silicate glass, the polishing liquid having a pH of 3.0 or more. A polishing method including a step of polishing a surface to be polished of a member to be polished containing undoped silicate glass by using the above-described polishing liquid. A method for manufacturing a component, including obtaining a component by using a polished member polished by the above-described polishing method.

The invention belongs to the technical field of tungsten and tungsten products, and particularly relates to a doped tungsten oxide composite material and a preparation method and application thereof. The invention provides a method for preparing doped tungsten oxide by a chemical precipitation method, which comprises the following steps: dispersing two aqueous solutions in the form of tiny liquid drops in an atomization manner, and carrying out chemical reaction at the moment of contact and mixing, so that rare earth element cations are rapidly combined with hydroxyl anions in an alkaline environment; the preparation method comprises the following steps: adding ammonium paratungstate into an ammonium paratungstate precursor, quickly drying at high temperature, nucleating to obtain the doped ammonium paratungstate precursor, realizing uniform distribution of rare earth elements, and calcining at high temperature to obtain the doped tungsten oxide composite material with uniform particle size. The invention aims to provide a preparation method of a short-process doped composite material powder which can be efficiently industrialized and is uniform in nanoscale particle size.

The invention provides a spherical nano cerium oxide particle and a preparation method thereof, and a cerium oxide polishing solution and a preparation method thereof, and relates to the technical field of cerium oxide particle preparation, and the preparation method comprises the following steps: S1, adding an organic reducing acid into cerium carbonate micro powder to obtain an organic reducing acid cerium solution; s2, adding an organic weak base into the organic reduced acid cerium solution; adding an auxiliary reagent solution, and mixing to obtain a flocculent suspension containing the cerium element; s3, adding an organic modification reagent into the flocculent suspension containing the cerium element, then adding a reaction regulating agent, carrying out a heating reaction, and drying to obtain a crude product of particles containing the cerium element; and S4, carrying out high-temperature calcination on the cerium-element-containing particle crude product to obtain the spherical nano cerium oxide particles. The spherical nano cerium oxide particles prepared by the method are suitable for high-end chemical mechanical polishing liquid of semiconductor substrates or special glass, the preparation method is low in cost and simple in process, and no harmful gas is generated in the production process.

The invention discloses preparation and application of a cerium-doped porous carbon material, and the preparation method comprises the following steps: adding cerium salt and 1, 3, 5-benzene tricarboxylic acid into an organic solvent, mixing to obtain a first mixed solution, stirring and refluxing the first mixed solution, and filtering to take a solid to obtain Ce-MOF; under the inert atmosphere, the Ce-MOF is calcined, and C-CeO2 is obtained; and carrying out acid etching treatment on the C-CeO2 to obtain the cerium-doped porous carbon material. The rod-like Ce-MPC material with high specific surface area, excellent pore structure and excellent electrochemical performance is successfully synthesized by taking Ce-MOF as a precursor through an innovative method of combining low-temperature reflux, high-temperature calcination heat treatment and etching of carbon-coated oxide, and the rod-like Ce-MPC material can be applied to preparation of a sodium-sulfur battery electrode material. Due to the excellent performance, the carbon material shows potential sodium storage application value as a sulfur positive electrode material in a room-temperature sodium-sulfur battery.

The invention discloses a method for preparing a high-suspension easily-dispersed nano cerium oxide solution with the assistance of ammonium chloride, and relates to the technical field of nano material preparation, and the preparation process comprises the following steps: (1) preparing a cerium nitrate solution; (2) preparing a mixed solution; (3) preparing a colloidal solution; (4) aging treatment; (5) preparing a precursor; (6) calcining the precursor; and (7) sanding the slurry. Compared with the prior art, the nano cerium oxide solution has the characteristics of simple and stable preparation process, low requirement on equipment, fewer types of raw materials, high purity of the obtained product, uniform particle size distribution, good particle dispersity, no need of addition of any auxiliary agent and the like, and the prepared nano cerium oxide solution is suitable for ultra-precise polishing and grinding of liquid crystal displays, optical elements, AR glasses and electrical and electronic equipment.

This invention belongs to the field of cerium oxide nanomaterials technology, and relates to a hydrophilic cerium oxide nanosphere, its preparation method, and its applications. The hydrophilic cerium oxide nanospheres have a spherical structure with an average particle size of 50-500 nm, and are made of sulfur-doped cerium oxide; the water contact angle of the hydrophilic cerium oxide nanospheres is ≤30°. The preparation method involves mixing cerium salt with an alcohol compound and a hydrophilic modifier, followed by a solvothermal reaction to obtain a cerium-based precursor; under an oxidizing atmosphere, the cerium-based precursor is heated to 500-800℃ for calcination and pyrolysis. The hydrophilic cerium oxide nanospheres provided by this invention incorporate elements such as sulfur, changing the inert surface of cerium oxide to a hydrophilic surface, fundamentally altering the hydrophilic properties of cerium oxide, which is beneficial for improving its dispersion stability in water or alcohol, and shows broad application prospects in catalysis, polishing, luminescence, and ultraviolet absorption.

The invention discloses nano cerium oxide, a preparation method thereof and a polishing solution applying the nano cerium oxide, and aims to solve the problems of low purity, non-uniform particle size distribution, easy breakage of polishing powder and low polishing rate in the prior art. The average particle size of the nano cerium oxide is any value in a range of 15-100 nm, and the polydispersity index PDI of the particle size of the nano cerium oxide is less than or equal to 0.3. The nano cerium oxide is high in purity, narrow in particle size distribution and not easy to break, and is used for the polishing solution, so that the polishing efficiency and the surface quality of the chemical mechanical polishing solution are remarkably improved.

Herein described is a method for making a composite material, comprising the steps of (a) swelling a blank hydrogel or a blank organogel using an inorganic precursor mixture to form an inorganic precursor-containing solvent-containing gel, wherein the inorganic precursor mixture comprises a solvent and one or more inorganic precursors, and (b) converting the inorganic precursor into ceramic or metal within the solvent-containing gel by introduction of reagents and / or stimuli to obtain a composite material. Optionally, the composite material can be converted into an inorganic material with an additional step (c) comprising thermally treating the composite material. Also described are the resultant composite material and the optional resultant inorganic material.

The present application relates to a kind of spheroidal doped ceria and its preparation method and application, the preparation method includes the following steps: after cerium salt, doped metal salt, solvent, acidic reagent and precipitant are mixed, hydrothermal reaction is carried out, and the precipitate is obtained, the precipitate is calcined, and the spheroidal doped ceria of the present application is obtained;The doped metal salt includes praseodymium salt and / or neodymium salt.The present application uses cerium salt and praseodymium salt and / or neodymium salt as doped metal salt as raw material, by the design of mixing process and reaction procedure and the selection of preparation process, the preparation of spheroidal doped ceria is realized, the doped ceria of nanometer level particle is obtained, and its appearance is regular and particle size is uniform, and, the preparation method used in the present application is simple, reaction time is short, and can be used for mass production.

The invention relates to the field of nano materials and photonic crystal materials, in particular to nano particles, preparation of the nano particles and application of the nano particles in self-assembly of three-dimensional non-close-packed photonic crystals. The nanoparticles can be self-assembled into a three-dimensional non-close-packed photonic crystal in a concentration range of 1 wt%-60 wt%. According to the invention, the problem that the self-assembly of the three-dimensional non-close-packed colloid photonic crystal is difficult to realize at low concentration at present is solved. By adjusting the mass fraction of the particles in a solution, the three-dimensional non-close-packed colloidal photonic crystal with rich colors can be formed through self-assembly, and the three-dimensional non-close-packed colloidal photonic crystal has wide application prospects in the fields of sensing, display and the like.

The invention belongs to the technical field of electrocatalytic materials, and discloses a CeO2 / NiCo2O4 heterojunction oxygen evolution reaction electrocatalyst and a preparation method thereof. According to the electrocatalyst, a composite protection layer composed of nitrogen-doped carbon quantum dots and CeO2 is constructed on the surface of a NiCo2O4 nanosheet array, cobalt ions are captured and dissolved out through pyridine nitrogen, reintegration is promoted through CeO2 oxygen vacancy, and interface dynamic self-repairing is achieved. And the nitrogen-doped carbon quantum dots are embedded into the CeO2 layer and are in direct contact with NiCo2O4 to synergistically inhibit cobalt loss and maintain structural integrity. By constructing the CeO2 / nitrogen-doped carbon quantum dot composite interface layer with dynamic ion capture and self-repairing capabilities, the problems of structure instability and performance degradation caused by cobalt ion dissolution of the NiCo2O4-based oxygen evolution reaction electrocatalyst under the working condition of strong oxidizing property are successfully solved; the method has important application value and industrialization prospect in the technical field of green hydrogen energy electrolyzed water.

The invention discloses nano cerium oxide synthesized based on a Taylor vortex reactor as well as a preparation method and application of the nano cerium oxide. The specific method comprises the following steps: dissolving cerium salt and a dispersing agent in water to form a reaction solution A, transferring the reaction solution A into a Taylor vortex reactor, dropwise adding an alkali solution, regulating and controlling the temperature of the Taylor vortex reactor and the material retention time to obtain a precursor, and burning out the precursor to obtain the cubic and / or rod-like nano cerium oxide. The cubic and / or rod-like nano cerium oxide prepared by the method has smaller particle size and better uniformity, and has wide application value.