844 results about "Nanorod" patented technology

The invention relates to the field of aluminum materials, and provides an automobile corrosion-resistant aluminum material and a preparation method thereof.The automobile corrosion-resistant aluminum material is prepared from cerium oxide loaded aluminum oxide nanorods, scandium / boron nitride nanotubes, zirconium powder, magnesium powder, copper powder, manganese powder, silicon carbide nanoparticles, TiB2 nanoparticles, aluminum powder and stearic acid. Wherein the cerium oxide loaded aluminum oxide nanorod is composed of an aluminum oxide nanorod and cerium oxide nanoparticles loaded on the surface of the aluminum oxide nanorod, and the scandium / boron nitride nanotube is composed of a boron nitride nanotube and a scandium nanolayer uniformly coated on the surface of the boron nitride nanotube. The material is prepared through mechanical ball milling, cold isostatic pressing forming, vacuum sintering and aging treatment, and finally the aluminum-based composite material containing the Al3Sc nano precipitated phase and the boron nitride nanotube reinforced phase is formed. And an Al3Sc precipitated phase and an aluminum matrix form a coherent interface, so that the strength, the corrosion resistance and the wear resistance of the material are improved. Through nanostructure optimization, high performance of the aluminum alloy is achieved, and the aluminum alloy is suitable for the fields of automobiles, aerospace and the like.

The invention provides a metasurface based on spin decoupling and a preparation method thereof. The metasurface comprises a substrate layer and a plurality of rectangular nano columns located on the substrate layer. Wherein the lengths, the widths and the rotation angles of the rectangular nano-columns are different, and the rectangular nano-columns have high transmittance and [0, 2pi] all-phase coverage and meet the conditions of a half-wave plate; the plurality of rectangular nanorods regulate and control the left-handed circularly polarized light and the right-handed circularly polarized light through a preset phase, so that a preset function is realized; the preset phase comprises a propagation phase and a geometric phase. According to the metasurface provided by the invention, the substrate layer and the rectangular nanorod array with various sizes and different rotation angles are fused, so that accurate and independent phase regulation and control on the circular polarization state of incident light are realized, and the constraint of mutual interference of spinning states in a traditional optical element is thoroughly eliminated; different circularly polarized light signals can be distinguished and independently processed under a single wavelength, and the optical regulation degree of freedom is shown.

The invention discloses a crosslinked polyethylene insulated flame-retardant power cable, which sequentially comprises a cable core, a shielding layer, an inner sheath layer, an armor layer and an outer sheath layer from inside to outside, and is characterized in that the inner sheath layer or the outer sheath layer is obtained by respectively extruding a sheath material on the outer side of the shielding layer or the armor layer; the sheath material is prepared from the following raw materials: low-density polyethylene, high-density polyethylene, phosphate modified yttrium-graphene nano porous particles, hydroxyapatite porous nanorods, a cross-linking agent, an assistant cross-linking agent, an antioxidant and the like. The obtained power cable has excellent insulativity and flame retardance and has a good application prospect in the field of high-voltage power transmission.

The present invention provides an electrochromic fabric and a preparation method thereof. The conductive fabric is treated to make its surface rich in active functional groups; oxalic acid and sodium tungstate solution are mixed, hydrochloric acid is added to adjust the pH, and then n-butanol is added to obtain a precursor solution. The fabric is placed in the precursor solution for high-temperature reaction to obtain the electrochromic fabric. By pre-treating the fabric, the number of functional groups on the fabric surface is increased, and adjusting the pH enhances the binding force between WO3 and the fabric; n-butanol ensures the stable formation of tungsten trioxide, promotes the interaction between oxalic acid and the functional groups on the fabric surface, improves the interfacial interaction force between the WO3 crystal nucleus and the fabric, and at the same time affects the crystal nucleus growth direction, forming a nanorod-like or three-dimensional microsphere structure, and improving the electrochromic performance. Through the synergistic cooperation of each process and related parameters, the electrochromic fabric of the present invention has obvious color change, good cycle stability and high mechanical properties; and the process is simple, the cost is low, and it is suitable for industrial mass production.

The invention discloses a composite film based on light-biological synergistic gradient degradation and a preparation method thereof, the composite film sequentially comprises a light response layer, a transition layer and a biological response layer from outside to inside, and the light response layer comprises a polycaprolactone matrix, a tetraphenylporphyrin iron photosensitizer and anatase type TiO2 nanorods; the transition layer is a gradient blend of polylactic acid and modified starch; the biological response layer comprises polyhydroxyalkanoate and bacterial cellulose nanofibers; through the design of the three-layer gradient structure and the construction of the bionic microchannel, the synergistic effect of light degradation, hydrolysis and biodegradation is realized; the composite membrane has excellent mechanical properties and environmental adaptability, the degradation period can be accurately regulated and controlled within 30-180 days, and the soil degradation rate within 60 days reaches 91% or above; the preparation method comprises the processes of electrostatic spinning, gradient co-extrusion and bacterial cellulose in-situ culture. The material can be widely applied to the fields of agricultural mulching films, food packaging and the like, and the problems that a traditional degradable film is poor in mechanical property and uncontrollable in degradation are solved.

The invention belongs to the technical field of conductive polymer materials, and particularly relates to a three-dimensional polypyrrole conductive material and a preparation method and application thereof. The preparation method of the three-dimensional polypyrrole conductive material comprises the following steps: (1) preparing a metal copper quantum dot and graphene oxide mixed dispersion liquid; (2) adding an oxidizing agent to obtain a reaction solution; (3) adding a pyrrole monomer, and carrying out a polymerization reaction to obtain a graphene oxide / polypyrrole composite dispersion liquid; and (4) adding a reducing agent to reduce the graphene oxide to obtain the three-dimensional polypyrrole conductive material. After the metal copper quantum dots are loaded on the graphene oxide sheet layer, the graphene oxide sheet layer becomes a structure-oriented core in subsequent polymerization, and finally the stable three-dimensional conductive composite material with graphene as a framework and polypyrrole nanosheets as connection points is formed. Compared with a traditional three-dimensional material formed by overlapping and integrating a two-dimensional graphene sheet layer and a conductive nanowire / nanorod, the three-dimensional material with the structure can form an efficient conductive path more easily under the condition of low filler content.

The invention relates to the field of solder materials, and provides a non-ferrous metal solder for low-temperature brazing and application, the solder is composed of carbon-coated copper nanorods, tin-bismuth alloy-coated silver nanoparticles, 2-mercaptobenzimidazole, rosin resin, an organic active agent, a dispersing agent, ionic liquid, hydroxyethyl cellulose, indium nitrate and citric acid. The silver particles are of a core-shell structure and are coated with tin-bismuth alloy layers, and continuous carbon layers are formed on the surfaces of the copper nanorods, so that the conductivity and the interface stability of the solder are effectively improved. The non-ferrous metal solder with excellent conductivity, low melting point and good wettability is prepared through step-by-step mixing, hot press molding and low-temperature heat treatment processes, and is suitable for electronic device packaging, power device connection and flexible circuit interconnection, and the defects of existing solder in the aspects of low-temperature welding and high conductivity are overcome.

The invention provides a fabric-reinforced electroactive nerve conduit and a preparation method and application thereof, and belongs to the field of biomedical materials.The fabric-reinforced electroactive nerve conduit comprises a nerve conduit inner layer and a nerve conduit outer layer, the nerve conduit inner layer is a woven skeleton formed by magnesium wires serving as parallel yarns and degummed silk through a three-dimensional weaving process, the pore diameter of the nerve conduit inner layer is 1.5-2 mm, and the thickness of the nerve conduit inner layer is 0.5-1 mm; the outer layer of the nerve conduit is a composite layer with a radial finger-shaped porous structure, which is formed by directionally freezing and casting a hydrogel cross-linked network formed by mixing potassium sodium niobate nanorods modified by polydopamine and a biopolymer material, and the thickness of the outer layer of the nerve conduit is 1-2mm. A three-dimensional weaving technology, a piezoelectric nano material and a biopolymer material are combined, a novel multifunctional nerve conduit is developed to repair nerve injury, a better solution is provided for nerve repair, and the fabric enhanced electric activity nerve conduit has important practical guiding significance in application of future clinical nerve injury repair.

The invention relates to the technical field of biomedical engineering, and discloses a preparation method of a nano-enzyme SERS (Surface Enhanced Raman Scattering) sensor for detecting diabetic retinopathy, which comprises the following steps: (1) synthesizing a bimetallic gold-palladium nanorod; (2) assembling a gold trioctahedron array; and (3) modifying the surface of the gold-palladium nanorod synthesized in the step (1) with single-stranded DNA1 to prepare a nano-enzyme probe, hybridizing an aptamer of a vascular endothelial growth factor (VEGF) with single-stranded DNA2, modifying the surface of the gold trioctahedron array assembled in the step (2) with the hybridized aptamer, preparing a capture substrate, and constructing the nano-enzyme SERS sensor by the nano-enzyme probe and the capture substrate. In the detection process, the VEGF triggers a competitive recognition mechanism to promote the nano-enzyme probe to be captured by the capture substrate and catalyze tetramethyl benzidine (TMB) to generate oxTMB with a strong SERS signal. The sensor has the advantages of high sensitivity, strong specificity and good accuracy, and can realize rapid quantitative detection of DR biomarkers in serum.

The invention discloses a barium ion single-doped / double-doped brookite titanium dioxide nanorod catalyst as well as preparation and application, the catalyst synthesized by a thermal decomposition method comprises brookite phase titanium dioxide and doped barium ions, and the nanorod-shaped catalyst containing oxygen vacancy defects has the width of 4-6 nanometers and the length of 20-50 nanometers. The piezoelectric property of brookite titanium dioxide is induced through doping of barium ions, charge separation is promoted through a built-in electric field, meanwhile, oxygen vacancies are induced through a charge compensation mechanism, the piezoelectric catalysis and photocatalytic efficiency is promoted, and the problems mentioned in the background technology are solved.

The invention relates to a surface-enhanced Raman scattering detection substrate, a preparation method thereof and a Raman scattering detection method. The surface-enhanced Raman scattering detection substrate comprises a silicon substrate, wherein at least one surface of the silicon substrate is provided with a functional area; the plurality of silicon nanorods are positioned in the functional region; the silicon nanorod comprises a main body part and a head part, the main body part is located between the head part and the silicon substrate, and the main body part is connected with the head part and the silicon substrate; the radial width of the head part is gradually reduced in the direction perpendicular to and away from the surface of the silicon substrate; the total area of orthographic projections of the silicon nanorods on the silicon substrate accounts for 1%-10% of the area of the functional area. According to the surface-enhanced Raman scattering detection substrate, enrichment of molecules to be detected in a three-dimensional space can be achieved, the signal enhancement capacity is high, and the detection sensitivity of target molecules can be remarkably improved.

The invention discloses an SERS (Surface Enhanced Raman Scattering) substrate for solution in-situ rapid detection as well as preparation and application thereof, and belongs to the technical field of substance detection. Comprising a substrate, a nanorod array film growing on the substrate, and metal nanoparticles deposited on the outer side surfaces of nanorods. The sensor has the advantages of portability of a solid substrate, strong plasmon resonance absorption in a broadband visible light region, strong surface enhancement effect and the like, and trace substances and microorganisms in a solution can be rapidly detected through the surface enhancement Raman effect; when substances in a solution are tested, pretreatment such as mixing, adsorption and drying is not needed, the limitation that in-situ detection of a traditional surface enhanced Raman base in the solution cannot be achieved is broken through, pretreatment-free in-situ and second-level ultrafast detection can be achieved, operation is easy, cost is low, and sensitivity is high. The problems that an existing SERS substrate is poor in stability and repeatability, and in-situ, ultrafast, trace and portable detection of substances in a solution cannot be achieved are solved.

The invention relates to the field of ceramic materials, provides a high-voltage-resistant PTC (Positive Temperature Coefficient) thermal sensitive ceramic material as well as a preparation method and application thereof, and aims to improve the voltage resistance and PTC effect stability of thermal sensitive ceramic. The material is composed of aluminum oxide-coated manganese-doped barium titanate nanorods, hollow-core silicon dioxide microspheres and a glass phase sintering aid, and the electric heating performance and the microstructure stability are optimized by constructing a core-shell structure and a three-dimensional composite system. A hydrothermal method and a sol-gel method are adopted to precisely control a raw material structure, and alcohol dispersion, tape casting and weak oxidizing atmosphere sintering are combined, so that the compactness and consistency of the ceramic are ensured. The material is suitable for high-voltage temperature control elements and over-current protection devices, and is widely applied to the fields of new energy automobile battery pack over-temperature protection, high-voltage power equipment current limiting elements, industrial automatic temperature control switches and the like.

The invention discloses a Mo-Bi-based catalyst and a preparation method and application thereof.The catalyst comprises active components, the active components comprise spherical particles and molybdenum oxide nanorods attached to the surfaces of the spherical particles, and the spherical particles contain molybdenum and / or molybdenum oxide and bismuth and / or bismuth oxide. When the catalyst is applied to propylene oxidation synthesis of acrolein, the catalyst has the technical effect of high acrolein selectivity.

The invention discloses a dynamic linear polarization device design based on a phase-change diatomic metasurface, and relates to the technical field of phase-change metasurfaces, and the linear polarization device is a single-layer metasurface formed by a super unit composed of a dielectric material nano column 1 and a phase-change material nano column 2. Wherein the nanorod 1 is represented as a half-wave plate and is responsible for realizing the conversion of a polarization state, and the nanorod 2 can realize the change of a phase from 0 to pi by changing the state of a phase change material, so that the effect of maintaining the polarization is achieved. When light rays act on the two kinds of nano-columns at the same time, the nano-columns 2 allow transmission light to keep the original polarization state of incident light, and the nano-columns 1 change the polarization state of the transmission light. And the two kinds of transmission light are superposed subsequently, so that the transmission light output by the whole super-unit shows the linear polarization characteristic, and the polarization angle of the transmission light and the rotation angle of the nano-column are kept consistent or form an orthogonal relationship. According to the invention, a phase-change diatomic structure is adopted, so that the metasurface can realize a linear polarizer with an adjustable polarization angle under the incidence of any polarization angle.

The invention belongs to the technical field of carbon nanomaterials, and particularly relates to a highly graphitized carbon tube grid of a scaffold-like structure and a preparation method and application of the highly graphitized carbon tube grid. The preparation method comprises the following steps: taking aluminum oxide with interconnected pore channels inside as a template, and obtaining a three-dimensional interconnected nickel nanorod grid film through an electro-deposition method; by utilizing the catalytic graphitization property of metal nickel and regulating and controlling parameters of acetylene when the acetylene is decomposed on the surface of the metal nickel, the problem that three-dimensional highly-graphitized carbon with controllable morphology and size cannot be synthesized due to nickel deformation caused by a catalytic mechanism is solved, and the highly-graphitized carbon tube grid with a scaffold-like structure is obtained; and the crystallinity of the carbon tube grid film is effectively improved at a relatively low temperature. The preparation process is simple, feasible and environment-friendly, and equipment is low in cost and common. A smooth ion transport channel provided by the vertical carbon tube array and a rapid electron conduction network provided by the highly graphitized interconnected carbon tube structure are expected to be used in the fields of alternating current filtering, high power output and the like.

The invention discloses a preparation method of a Pt-CdZnS composite photocatalytic hydrogen production material, which is characterized in that Pt is deposited on a Cd0. 6Zn0. 4S nanorod by using a low-temperature vacuum reduction synthesis method to prepare the Pt-CdZnS composite material. The photocatalytic hydrogen production performance of the sample prepared by the method can be up to 10.25 mmol / g <-1 > h <-1 >, which is about 13.67 times that of pure Cd0. 6Zn0. 4S (0.75 mmol / g <-1 > h <-1 >).

The present invention discloses a preparation method and application of a cadmium sulfide nanotube array catalyst. First, a cadmium sulfide nanorod array is prepared on a conductive glass by a hydrothermal method; then, a cadmium sulfide nanotube array catalyst is prepared by etching the cadmium sulfide nanorod array using a photolithography method. The cadmium sulfide nanotube array catalyst prepared by the present invention utilizes the excellent visible light absorption characteristics of cadmium sulfide to improve the light energy utilization rate, and uses a tubular nanostructure with a large specific surface area to increase the active area of the photoelectrocatalytic water splitting reaction, effectively promoting the separation and transmission of photogenerated carriers, inhibiting the recombination of photogenerated carriers, and showing excellent photoelectrocatalytic water splitting hydrogen production performance. The process of the present invention is simple, the synthesized substance has high purity, the size is at the nanometer level, and the raw materials used are cheap, which is suitable for the field of photoelectrocatalytic water splitting hydrogen production.

The invention discloses a preparation method and application of an HPW and Ru co-modified CeO2 porous nanorod catalyst, and belongs to the technical field of catalytic materials. The method comprises the following steps: (1) preparing cerium dioxide porous nanorods; (2) loading HPW on the cerium dioxide porous nanorod to obtain CeO2-HPW; and (3) loading Ru nano particles on the CeO2-HPW, so as to obtain the CeO2 porous nanorod catalyst Ru / CeO2-HPW co-modified by the HPW and the Ru. The catalyst disclosed by the invention is of a porous rod-like structure and has the characteristics of high pore diameter, high acid capacity, multiple oxidation-reduction active sites, water vapor resistance and the like. The catalyst disclosed by the invention is applied to the catalytic oxidation reaction of 1, 2-DCE, and shows excellent catalytic performance at 90% conversion rate temperature T90 of 273 DEG C, the carbon dioxide mineralization rate of 1, 2-DCE reaches 90% at 279 DEG C, and the generation of by-products is reduced.

The invention discloses a nanorod-shaped Ni / Ni3S2 / VN electro-catalytic material and a preparation method and application thereof.The preparation method comprises the steps that firstly, a nickel source is loaded on the surface of bacterial cellulose, and a Ni / Ni3S2 / VN electro-catalytic hydrogen evolution material with the nanorod-shaped morphology is prepared through a solid-phase sintering method; the bacterial cellulose is a pure natural biomass element, has no pollution to the environment, is green and environment-friendly, has a large number of carboxyl functional groups on the surface, can effectively complex free nickel ions in a solution as a template agent, and keeps good catalytic stability after being carbonized into carbon nanofibers, and Ni3S2 and VN are compounded, so that the catalytic performance of the carbon nanofibers is improved. According to the preparation method, a nanorod-shaped heterostructure is formed, part of Ni metal is reduced, all the components have a synergistic effect, the excellent electro-catalytic hydrogen evolution performance is shown in an alkaline environment, the preparation process is green, simple and convenient, and reaction conditions are easy to control.

The invention relates to a porphyrin-based iron metal organic framework (Fe-TCPP) catalyst for improving photoresponsiveness, which is characterized in that the Fe-TCPP nano catalyst is prepared by using an iron source and meso-tetra (4-carboxyphenyl) porphin (TCPP) as precursors through a simple solvothermal method, assisting coordination by virtue of polyvinylpyrrolidone (PVP), performing sealed reaction after ultrasonic dispersion, and preparing the Fe-TCPP nano catalyst. A purple suspension is obtained. And centrifuging, washing and drying to obtain the nano rod-shaped Fe-TCPP metal organic framework material. The Fe-TCPP catalyst prepared by the preparation method disclosed by the invention has a regular crystal structure and good dispersity, and can be stably coordinated to form a Fe-O cluster structure. The effective introduction of the TCPP enhances the charge transfer (LCCT) capability from the ligand to the metal cluster, effectively promotes the Fe (III) / Fe (II) circulation, and improves the photocatalysis-ozonation catalytic efficiency. The catalyst has the advantages of high thermal stability, less metal ion dissolution, good cycle performance and the like, and has wide application potential in the field of water treatment.

The invention belongs to the technical field of lithium ion battery electrode materials, and particularly discloses a diameter-controllable one-dimensional lithium manganate nanorod as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing manganese sulfate, potassium permanganate, a structure-directing agent and a surfactant into a solvent, and carrying out hydrothermal reaction to obtain a black precipitate; sintering the black precipitate to obtain a manganese dioxide nanorod; and mixing the manganese dioxide nanorod with lithium hydroxide, and carrying out two-stage sintering to obtain the one-dimensional lithium manganate nanorod. The prepared lithium ion battery anode material is uniform in thickness and very small in surface energy, can effectively shorten the transmission path of lithium ions when being used as an anode material, is not easy to agglomerate, has good flexibility, can maintain the structural integrity in a large-current long-time service process, and is beneficial to improving the rate and cycle performance of an electrode. In addition, by adjusting the concentration of potassium permanganate and the hydrothermal reaction temperature, the diameter of manganese dioxide can be accurately adjusted, and controllable preparation of one-dimensional lithium manganate is realized.

The invention belongs to the technical field of biomedical materials, and particularly relates to application of a HAp-MXene nano composite material in regulation and control of an osteogenesis immune microenvironment. The HAp and MXene nanocomposite is obtained by combining hydroxyapatite nanorods and MXene nanosheets, the HAp and MXene nanocomposite is interfered by adjusting an external magnetic field, so that the HAp and MXene nanocomposite shows one effect of regulating and controlling polarization of macrophage M1 or macrophage M2; then, the HAp-MXene nanocomposite is implanted into a bone defect area, and in the initial stage of the operation, the magnetoelectric effect of MXene is excited by applying a rotating magnetic field, polarization of M1 type macrophages is promoted, proinflammatory factors are generated, and bacterial infection is inhibited; then, in the middle stage, through removing a magnetic field, releasing calcium ions, promoting polarization of the M2 type macrophages, relieving inflammatory response and promoting bone regeneration, programmed regulation and control of the macrophages are achieved in different repair stages.

The invention discloses an intelligent purification coating with a bionic pulmonary membrane type respiratory metabolism function. The intelligent purification coating comprises a sensing and adsorption layer, a driving and transportation layer and a catalysis and metabolism unit, the sensing and adsorption layer is composed of a chemical heterojunction network formed by two-dimensional transition metal carbonitride MXene and a zeolite imidazate framework structure material through an in-situ coordination reaction of metal ions and hydroxyl groups on the surface of MXene; the driving and transporting layer takes a cross-linked liquid crystal elastomer network as an intelligent response matrix, and high-length-diameter-ratio magnetic ferroferric oxide nanorods of which the surfaces are modified by a silane coupling agent are uniformly dispersed and embedded into the matrix; and the catalysis and metabolism layer is anchored on a preset key mass transfer path in the driving and transporting layer in a discrete metabolism island form. According to the coating, various volatile organic compounds (VOCs) and enzyme-light synergistic deep mineralization can be realized under mild conditions, and the energy metabolism function of mitochondria can be accurately simulated.

The invention provides a polarization multiplexing metasurface-based depolarization holographic method, which comprises the following steps of: describing a polarization state of light by using Jones calculation, and defining a propagation model of a wave; the pixel pitch of the metasurface and the height of the nanorod are determined, and a function between the length and width (l, w) of the nanorod and the modulation phase is obtained; a strict coupling wave analysis RCWA method is used, and electromagnetic response of the nanostructure is simulated under local period approximate LPA; fitting the libraries of phi xx and phi yy through a linear quadratic polynomial at each wavelength so as to represent a Jones matrix of the metasurface; introducing a noise function fnoise, applying the noise function fnoise to the metasurface, and calculating the complex amplitude of the metasurface by using an agent model; and establishing a joint optimization process, optimizing the metasurface geometric diagram and the SLM phase diagram, generating a focal length stacking hologram of the target image data set, and performing verification by using a CITL calibration model. According to the method, the image quality can be improved.

The invention discloses an industrial flue gas denitration filter bag and a preparation method thereof, and relates to the technical field of flue gas denitration. The industrial flue gas denitration filter bag comprises PTFE (Polytetrafluoroethylene) fibers, PPS (Polyphenylene Sulfide) fibers, PI (Polyimide) fibers and PTFE loaded fibers. Wherein the PTFE loaded fiber is a PTFE fiber layer loaded with a modified molecular sieve catalyst; the modified molecular sieve catalyst takes a molecular sieve coated with modified nanorods as a carrier, a vanadium-titanium composite oxide as an active catalytic component and a cerium-titanium composite oxide as a co-catalytic component; the modified nanorod is a molybdenum-tungsten composite oxide modified cerium dioxide nanorod. By introducing the modified molecular sieve catalyst prepared from cerium dioxide nanorods, lanthanum nitrate, molybdenum trioxide and other raw materials, the denitration capacity, the ammonia escape prevention capacity, the sulfur poisoning resistance, the hydrothermal stability and the working life are further improved, and an active temperature window is widened. Therefore, the method has a wider application prospect.

The invention belongs to the technical field of water electrolysis hydrogen production catalysis, and particularly relates to a ruthenium molybdenum oxide nanorod electrocatalyst, a preparation method and application. In the electrocatalyst, the molar ratio of Mo to Ru is 1: 1-1: 9, and Mo atoms enter ruthenium oxide crystal lattices in the form of replacing Ru atoms; the method comprises the following steps: adding ammonium-containing molybdenum salt and NaNO3 crystals into a ruthenium salt solution, drying, grinding, calcining in air, cooling, and washing with deionized water to remove the NaNO3 crystals to obtain the electrocatalyst. According to the preparation method of the electrocatalyst, the problems of poor stability, high cost, complicated preparation and the like in the preparation process of an anode end catalyst in a proton exchange membrane water electrolysis hydrogen production technology are solved, the prepared electrocatalyst presents an ultra-small nanorod morphology, and a large number of edge and corner sites are generated for an oxygen production reaction; the Ru-O coordination structure of the electrocatalyst is in an unsaturated state, the Ru-O covalent interaction is significantly weakened, the introduction of Mo with low electronegativity inhibits the excessive oxidation of the electrocatalyst, and the oxygen production stability is high.

The invention belongs to the technical field of hydrolysis hydrogen production, and particularly relates to a preparation method of a CoPx-CeO2 loaded platinum catalyst with a core-shell structure and application of the CoPx-CeO2 loaded platinum catalyst in seawater electrolysis hydrogen production. A Co (CO3) 0.5 (OH) nanorod precursor is prepared on foamed nickel through a hydrothermal method and then calcined to obtain CoPx, a CeO2 film is electrically deposited to obtain a CoPx-CeO2 composite carrier, and platinum is impregnated and loaded to obtain the CoPx-CeO2-Pt catalyst. The catalyst shows excellent hydrogen evolution catalytic activity in seawater, and the CoPx-CeO2 composite carrier prevents Pt nano-particles from being agglomerated through interaction of metal carriers, so that the atom utilization rate of Pt is increased. Meanwhile, the CeO2 film actively enriches OH <-> in an alkaline electrolyte to construct a local high-alkalinity microenvironment on the surface of the catalyst, Cl <-> in seawater is prevented from getting close to an active site corroding the catalyst through electrostatic repulsion, and the stability and durability of the catalyst are improved.

The invention belongs to the field of nano material preparation, and discloses a nickel-molybdenum-iron compound growing on foamed nickel and a preparation method and application of an anion exchange membrane. The difunctional electrocatalyst Ni2P / MoOx / Fe2P with an amorphous MoOx and crystal Ni2P / Fe2P heterogeneous structure is prepared through a hydrothermal-etching-phosphating method. Ni2P / MoOx / Fe2P is used as a cathode and an anode, an overall water decomposition (OWS) performance test is carried out in an electrolyte containing 1M of KOH, and the required voltage is only 1.815 V when the current density reaches the large current density of 250mA cm < 2 >. This is attributed to sufficient active sites, abundant phase interfaces and a unique nanorod array structure in the nickel-molybdenum-iron compound. The material still has excellent stability under the ultrahigh constant current density of 500 mA cm < 2 >. The PVA / PDDA-OH <-> membrane with anion selectivity is prepared through physical crosslinking of PVA and PDDA, and the PVA / PDDA-OH <-> membrane has good OH <-> conductivity. The anion exchange membrane water electrolyzer assembled by using the Ni2P / MoOx / Fe2P catalyst and PVA / PDDA-OH <-> stably operates for 250 hours under the current density of 1 A cm <-2 >, the hydrogen production Faraday efficiency is about 94.8% through calculation, and the potential of the anion exchange membrane water electrolyzer in the actual application of large-current hydrogen production is highlighted.

The invention discloses a method for generating a multi-focus circular beam based on an all-dielectric metasurface, and the method specifically comprises the following steps: 1, constructing the all-dielectric metasurface which is composed of a plurality of arranged super atoms; the super atom comprises a square SiO2 substrate, and a rectangular Si nanorod is arranged on the SiO2 substrate; and 2, irradiating the all-dielectric metasurface by using left-hand circularly polarized light as incident light, and modulating the incident light by using a geometric phase and a propagation phase, so that emergent light of the all-dielectric metasurface forms a right-hand circularly polarized multi-focus circular light beam. According to the invention, the circularly symmetrical light beams with a plurality of self-focusing focuses can be efficiently and flexibly generated, and the number and the focal depth of the focuses can be adjusted as required.