84 results about "Metal doped" patented technology

The application provides a Sn-doped Fe-N-C catalyst, a preparation method and application thereof. The catalyst comprises a carrier and Sn atoms and Fe atoms supported on the carrier, and the carrier is an N-doped carbon material. The application dopes the p-block metal Sn with stronger electronegativity into the Fe-N-C catalyst, forms an electron-withdrawing environment around the FeN4 site, reduces the electronegativity of the FeN4 site, and weakens the adsorption strength of the FeN4 site on the oxygen reduction intermediate. Meanwhile, the metal Sn is weaker in reactivity with hydrogen peroxide produced by the reaction of oxygen via a two-electron process than Fe, reduces the concentration of free radicals produced by the reaction, improves the stability of the carrier and active sites, and can effectively prevent the shedding of Fe. The application uses the catalyst as a cathode catalyst of a proton exchange membrane fuel cell, is low in cost, and can simultaneously meet the requirements of high catalytic activity and good stability.

A catalytic electrode includes a nickel-based porous base material, and a plurality of catalytic alloy balls of nickel and another metal doped with elements, in which the another metal includes iron, the elements include C, F, and S, and the catalytic alloy balls are dispersed on the surface of the nickel-based porous base material. The catalytic electrode also includes a plurality of metal phosphide particles covering the nickel-based porous base material and the catalytic alloy balls, and the metal phosphide particle includes nickel phosphide, nickel iron phosphide, nickel cobalt phosphide, nickel copper phosphide, or nickel zinc phosphide.

This invention discloses a method for preparing a metal-doped anode material with high closed-pore ratio, comprising the following steps: pre-oxidation, liquid-phase coating, isostatic pressing, metal doping, and carbonization. By using glucose to liquid-phase coat pre-oxidized biomass char, followed by isostatic pressing to form a dense and uniform composite carbon framework, the pores are predominantly closed pores of 0.4-2 nm, and the carbon layer is tightly bonded to the matrix without cracks. Furthermore, by gas-phase doping with zinc, zinc is uniformly dispersed in the form of single atoms / clusters and embedded in the carbon lattice, forming a unique Zn-C coordination structure without metal particle agglomeration defects. Simultaneously, the high temperature of 1400-1600℃ promotes the migration of zinc atoms into the carbon lattice depth, improving the microcrystallinity of the carbon material while retaining sodium storage active sites, resulting in stronger structural stability and ultimately achieving a high closed-pore ratio, thereby improving the capacity and rate performance of the anode material.

This invention discloses a method for preparing a highly coordinated sulfur-doped single-atom catalyst and its application, comprising the following steps: S1, mixing and stirring zinc nitrate hexahydrate, dimethylimidazole, hexadecyltrimethylammonium bromide, a metal source, and deionized water to obtain metal-doped ZIF-8; S2, heating the metal-doped ZIF-8 under an argon atmosphere to obtain an undoped metal single-atom catalyst; S3, preparing the undoped metal single-atom catalyst into a highly coordinated sulfur-doped metal single-atom catalyst; S4, adding the highly coordinated sulfur-doped single-atom catalyst to antibiotic wastewater for treatment; This invention avoids coordination in the first shell of the metal atom by mixing the single-atom catalyst and thiourea and performing a second pyrolysis, thereby forming a sulfur-doped highly coordinated single-atom catalyst.

This invention relates to the field of wastewater treatment technology, specifically to a metal-doped bismuth ferrite-based perovskite composite material, its preparation method, and its applications. The molecular formula of the metal-doped bismuth ferrite-based perovskite composite material is Bi. 1‑x A x Fe 1‑y B y O3; 0 ≤ x < 1, 0

This invention provides a method for preparing an ultra-stable metal-doped aluminum fluoride catalyst and its application in photocatalytic carbon dioxide reduction, belonging to the field of catalytic materials. The invention first involves drying and grinding an aluminum-containing compound, then mixing it with a metal salt and introducing active metal sites and the key element fluorine through high-energy mechanical ball milling in a polytetrafluoroethylene (PTFE) ball mill jar. Subsequent heat treatment transforms the aluminum-containing precursor into a highly stable aluminum fluoride support through in-situ fluorination, successfully constructing an atomically dispersed metal-doped aluminum fluoride catalyst. This catalyst exhibits high activity and selectivity in CO₂ photoreduction and demonstrates excellent physical and chemical stability under extreme acid-base and high-temperature oxidizing environments. The preparation process of this invention is simple and environmentally friendly, breaking through the bottleneck of traditional catalysts' easy deactivation under extreme conditions, and providing a new path for developing highly stable photocatalytic materials.

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 application belongs to the field of photoelectric materials and devices, and discloses a method for preparing metal-doped graphene oxide conductive ink, which comprises the following steps: immersing a metal substrate into an aqueous solution of graphene oxide, and carrying out a redox reaction to obtain reduced graphene oxide ink loaded with metal oxide particles. The method realizes the preparation of reduced graphene oxide conductive ink loaded with metal oxide particles through in-situ spontaneous redox reaction of graphene oxide and the metal substrate. Compared with the traditional method for preparing metal-doped graphene ink, the method can realize in-situ low-temperature redox, avoids the use of organic solvents or ionic liquids, reduces the residual organic matter, and significantly improves the conductivity by in-situ embedding of metal oxide particles.

A composition of an indium oxide catalyst including an alkali metal dopant and a method for producing an indium oxide catalyst including an alkali metal dopant. The alkali metal dopant can include Li + , Na + , K + , Rb + , Cs + , and Fr + cations. The method for producing an indium oxide catalyst including an alkali metal dopant includes mixing a solution of an indium salt with a base to form precipitated indium hydroxide (100), contacting the precipitated indium hydroxide with a solution including an alkali metal salt to produce an indium hydroxide solution (102), and calcining the indium hydroxide solution to form indium oxide; thereby forming an indium oxide catalyst including an alkali metal dopant (104).

The application discloses a high-polishing-rate gallium arsenide CMP etching solution and application thereof, which comprises functional composite abrasive, oxidizing agent, pH regulator, complexing agent and aqueous medium; the functional composite abrasive is metal-doped mesoporous silicon oxide nanoparticles; the same polishing system is used for the first time to simultaneously consider extremely high material removal rate and extremely low surface roughness, and a long-term technical contradiction in the field is solved.

The application provides a metal-doped niobium oxide material, which is used as a catalyst to catalyze 1,4-butanediol to prepare tetrahydrofuran. The catalyst preparation method is simple, and the catalyst can be recycled and reused, and is safer and more environmentally friendly compared with a traditional strong acid homogeneous catalyst. In addition, the catalyst has a lower required temperature in a reaction process, a greatly prolonged catalyst service life compared with a traditional strong acid heterogeneous catalyst, and good hydrothermal stability. Therefore, the metal-doped niobium oxide material M@NbO x prepared by the application has certain industrial application prospects.

This invention discloses a method and application for preparing metal-doped composite catalysts based on ZIF-67, relating to the field of wastewater treatment technology. This invention constructs a multi-component synergistic system through the coordination of functional groups on the surface of biochar with ZIF-67 and the electronic coupling effect between rare earth metals and Co. Compared with traditional pure chemical support synthesis methods, this reduces costs and improves environmental compatibility. The metal-doped composite catalyst prepared by this invention is a novel heterogeneous catalyst. Through the electrostatic interaction between the biochar support and Co ions, and the metal-metal bonds formed between La / Ce and Co, it significantly enhances the stability of Co ions, effectively avoiding secondary pollution. The metal-doped composite catalyst prepared by this invention can efficiently activate persulfate to generate reactive oxygen species and synergistically remove multiple pollutants from complex water bodies containing sulfamethoxazole, tetracycline, levofloxacin, and other antibiotics such as methylene blue.

This invention belongs to the field of catalyst technology, specifically relating to a multi-metal-doped cerium oxide catalyst and its preparation and application. The catalyst comprises a γ-Al₂O₃ support and an active component supported thereon, wherein the chemical formula of the active component is Ni. a Fe b Ru c Co d Ce1 a b c d O 2‑δ Wherein, 0.05≤a≤0.1, 0.04≤b≤0.06, 0.04≤c≤0.06, 0≤d≤0.06, and a+b+c+d≤0.2. The catalyst is prepared by solution impregnation, by preparing a metal salt solution and impregnating it on a γ-Al2O3 support to obtain a sol with a complexing agent, which is then aged, dried, and calcined in stages. The catalyst is used in the steam reforming reaction of aviation kerosene (n-dodecane simulation), and can achieve 100% catalytic conversion at 700 °C, without deactivation after 100 h of continuous operation, exhibiting low-temperature activity and anti-carbon deposition performance; wherein Ni 0.05 Fe 0.05 Ru 0.05 Co 0.05 Ce 0.8 O 2‑δ When reformed gas drives a tubular solid oxide fuel cell, the power density reaches 830.90 mW / cm³. 2 It operates stably for 100 hours without significant degradation. The process of this invention is simple and cost-controllable, and it is applicable to the fields of hydrogen production from aviation kerosene reforming and SOFC coupled power generation.

This invention relates to the field of wastewater treatment technology, and in particular to a bimetallic doped self-supporting electrode, its preparation method, and its application. Constructed via a two-step chemical vapor deposition method, the bimetallic doped self-supporting electrode MN-SnO2 / GF / NF comprises a foamed nickel substrate GF / NF coated with foamed graphite, and a bimetallic doped SnO2 layer MN-SnO2 grown in situ on the foamed nickel substrate GF / NF, wherein M and N are any two of Sb, In, Fe, Co, and Mn. This invention, employing the aforementioned bimetallic doped self-supporting electrode, its preparation method, and its application, possesses advantages such as tight interfacial bonding and fast electron transport, and can efficiently drive sulfate radical-mediated pollutant degradation reactions.

The invention provides a method for fabricating high-flow ceramic water filters with antimicrobial properties. The process involves preparing a ceramic suspension using mining waste, red clay, limestone, cassava starch, and a dispersing agent. The suspension is cast into dome-shaped metal molds, heated to gelatinize the starch, and thermally treated to create a porous ceramic matrix with about 57% apparent porosity and 4 MPa flexural strength. The porous filter is coated with a metal-doped ferrite oxide (e.g., Cu0.7Co0.3Fe2O4) to impart antimicrobial properties while maintaining high flow rates between 12 to 24 liters per hour. The filters effectively reduce turbidity to 0.14–4 NTU, maintain pH levels of 6.9–8.8, and eliminate microbial contaminants, including Escherichia coli and fecal coliforms. This cost effective method utilizes locally available raw materials, is scalable for industrial production, and is applicable for domestic and industrial water purification systems.

The application provides a silicon-carbon composite material with a core-shell structure, a preparation method of the silicon-carbon composite material and a secondary battery. The method comprises the following steps: S1. reacting a phenolic compound, an aldehyde compound and a metal salt compound under the condition of lye and a catalyst, and performing calcination treatment on the product after the reaction to obtain a metal-doped porous carbon material; S2. performing heat treatment on the metal-doped porous carbon material in step S1 and a silane mixed gas to obtain a metal-doped silicon-carbon material; and S3. performing calcination treatment on the metal-doped silicon-carbon material in step S2, a passivation gas and a carbon source to obtain the silicon-carbon composite material with the core-shell structure. The application utilizes phenolic aldehyde reaction to dope metal elements to improve the electronic conductivity of the inner core of the material, and coats the outer shell of the material with carbon nanotubes and amorphous carbon to bind the expansion of silicon.

The application belongs to the technical field of iodine-containing wastewater treatment, and specifically provides a method for treating iodine-containing wastewater, which comprises the following steps: mixing a metal-doped bismuth tungstate material for treating iodine-containing wastewater with a binder and a conductive agent to prepare a slurry, coating the slurry on a conductive substrate, and drying to obtain a membrane electrode, and using the obtained membrane electrode to treat iodine-containing wastewater; and a preparation method of the metal-doped bismuth tungstate material for treating iodine-containing wastewater, which comprises the following steps: 1) dissolving bismuth salt and iron salt in a solvent to prepare a mixed solution; 2) adding a tungstate solution to the mixed solution to form a suspension, and then performing a hydrothermal reaction, collecting the precipitate after cooling, and washing and drying to obtain the product. The metal-doped bismuth tungstate material prepared by the application has the advantages of high specific surface area and good photo-assisted electric adsorption performance.

This invention provides a metal-doped electrode and a method for the electrochemical oxidation of phenol to prepare p-benzoquinone. The metal-doped electrode comprises a conductive substrate material and lead, manganese, and ruthenium metals attached to the surface of the conductive substrate material, wherein the mass ratio of lead, manganese, and ruthenium is 60-95%:2-25%:2-15%. The method for the electrochemical oxidation of phenol to prepare p-benzoquinone uses the metal-doped electrode of this invention as the anode and a lead electrode as the cathode in a two-chamber electrolytic cell containing a diaphragm, and electrolyzes phenol to prepare p-benzoquinone under acidic conditions. The electrode of this invention is corrosion-resistant under acidic conditions and has a long service life. Current density >4000 A / m 2 By controlling the current density, the selectivity of benzoquinone is >90%. The electrode materials used are inexpensive and readily available, the electrochemical process is simple, and the process is safe and reliable, showing great promise for industrialization.

The application discloses a thermal spraying flame heat recovery and recycling device based on emissivity regulation, and aims at solving the problems of serious flame heat dissipation, low energy utilization rate and insufficient melting of high melting point powder in the existing plasma thermal spraying process. The thermal spraying flame heat recovery and recycling device is provided with a heat recovery cover at the outlet end of a plasma thermal spraying device, the heat recovery cover is a high-temperature-resistant shell, the high-temperature-resistant shell is internally provided with a hollow cavity, the hollow cavity forms a vacuum heat insulation interlayer, the inner surface of the cover of the high-temperature-resistant shell is provided with a high-emissivity coating, the high-emissivity coating is a perovskite coating, a spinel coating or a pyrochlore / defect fluorite coating, the outer surface of the cover of the high-temperature-resistant shell is provided with a low-emissivity coating, and the low-emissivity coating is a metal-doped ZnO coating. The thermal spraying flame heat recovery and recycling device can not only significantly improve the energy utilization rate of the thermal spraying flame, but also improve the coating quality and service protection performance.

This invention discloses an alkaline earth metal Ca-doped W 18 O 49 This invention relates to a catalyst, its preparation method, and its application, belonging to the field of functional materials. The method includes: 1) mixing 40-50 mL of anhydrous ethanol and 10-20 mL of acetone and stirring to obtain mixed solution A; 2) weighing 0.001-0.003 mol of tungsten hexachloride and adding it to mixed solution A, and stirring to obtain mixed solution B; 3) weighing CaCl2 according to nCa:nW = 0.01-0.05 and adding it to mixed solution B, and stirring to obtain mixed solution C; 4) transferring mixed solution C to a reaction vessel, sealing it, and placing it in an oven, reacting at 190-210℃ for 6-12 h; 5) after the reaction is complete, washing the product with industrial alcohol by filtration, drying it in a vacuum oven at 50-80℃ for 10-30 min, and collecting the product. This invention solves the problem of single W 18 O 49 Catalysts often suffer from insufficient electronic conductivity, limited utilization of active sites, and poor stability. This invention increases the number of oxygen vacancies and the density of active sites, while simultaneously improving the ion transport channels of the material and enhancing its adsorption and anchoring ability for polar polysulfides.

This invention relates to a rare earth metal-doped sodium iron sulfate cathode material, its preparation method, and a battery thereof. The cathode material is expressed as Na. 2‑2x Fe 2‑2x R 2x (SO4)3, where 0.02 ≤ x ≤ 0.1, and R is selected from rare earth metal elements. The preparation uses iron, rare earth metal, and sodium sources as raw materials, and ascorbic acid as a reducing agent. The product is obtained through dissolution and drying. This invention utilizes rare earth ions to substitute Fe. 2+ The invention establishes a stable crystal structure, significantly suppresses Fe ion dissolution at high temperatures, and mitigates structural distortion during charge and discharge. The resulting material exhibits significantly improved capacity retention after 300 cycles at 45°C and 1C rate, demonstrating excellent high-temperature cycling stability. This invention utilizes a mild process, readily available raw materials, and high reproducibility, solving the problems of poor high-temperature cycling and rapid capacity decay in traditional sodium iron sulfate cathodes. It is suitable for high-performance sodium-ion batteries and possesses promising industrialization prospects.

This invention discloses a heterostructured electrocatalyst, its preparation method, and its applications, belonging to the field of catalyst technology. The method includes the following steps: mixing MoS2 powder and nickel powder, followed by mechanochemical ball milling under an inert atmosphere to obtain the heterostructured electrocatalyst. The method provided by this invention can achieve integrated structural control and metal doping at room temperature and pressure, thereby significantly improving the hydrogen evolution activity and stability of the material in alkaline media. Furthermore, this invention has industrial advantages such as low energy consumption, no pollution, and simple post-processing, providing a new pathway for the large-scale preparation of high-performance, low-cost hydrogen energy materials.

The application discloses a transition metal doped cerium oxide-three-dimensional graphene composite material rich in oxygen vacancies and a preparation method. 2‑x The chemical formula of the composite material is TM-CeO 2‑x / 3D Gr, wherein x is in the range of 0.09-0.56, and TM is one of Fe, Co, Ni, Mn or Cr. The transition metal doping can introduce a large number of oxygen vacancies in CeO2 by using the difference in valence states, thereby optimizing the electronic structure of the material, improving the redox activity, and enhancing the conductivity of CeO2. The TM-CeO 2‑x / 3D Gr composite material has significantly improved electrochemical performance. When the composite material is assembled into a flexible supercapacitor and subjected to performance testing, the supercapacitor exhibits excellent electrochemical performance and mechanical properties.

An alkali metal-doped iron-based perovskite catalyst, its preparation method, and its application are disclosed. The catalyst uses an iron-based perovskite catalyst as a matrix, in which alkali metals are in-situ doped. The method includes mixing Nd(NO3)3·6H2O, Fe(NO3)3·9H2O, and deionized water to obtain a metal salt solution; mixing the metal salt solution with a complexing agent and adding ammonia to adjust the pH to neutral to obtain a sol; subjecting the sol to aging, drying, calcining, and grinding sequentially to obtain NdFeO3; mixing NdFeO3, carbonate, and deionized water to obtain an alkali metal-doped iron-based perovskite catalyst; introducing alkali metal elements into the iron-based perovskite catalyst through impregnation and physical mixing processes; constructing locally electron-rich regions on the surface of the iron-based perovskite catalyst with alkali metals; achieving surface enrichment of active sites; and significantly improving the catalyst activity and selectivity for low-carbon olefins.

Novel water / gas ratio reducer compounds comprising metal-doped carbon quantum dots, methods of their manufacture, sandstone and limestone gas well compositions containing the water / gas ratio reducer compounds and methods of their use are disclosed. The novel water / gas ratio reducer compounds are useful, inter alia, to decrease Kw / Kg ratio for the reservoir output, reduce the water permeability in the reservoir and / or increase gas permeability in the reservoir use, increase production rate, to increase total output from the reservoir, are more environmentally acceptable, employable at much lower concentrations, are reusable, may be used in a wider range of gas well drilling fluids including, for example, seawater-based drilling fluids and / or more cost-effective in use.

The application discloses alkali metal doped perovskite single crystal material and a preparation method and application thereof. A high-concentration alkali metal halide is introduced into a perovskite aqueous phase precursor, and an alkali metal doped perovskite single crystal is precipitated through a cooling method. The traditional cesium lead bromide perovskite light emitting wavelength band is near 520 nm, and wide spectrum emission cannot be realized. The scheme can prepare a centimeter level perovskite CsPb2Br5 single crystal with wide spectrum emission. Test results show that the alkali metal doped perovskite CsPb2Br5 single crystal fluorescence spectrum covers a visible light and near infrared light wavelength band (500-1000 nm).

A method for making a superconducting article, the method comprising: depositing a metal layer on a surface of a polycrystalline substrate; and focusing a pulsed laser beam on the metal layer to implant metal ions from the metal layer into the polycrystalline substrate, thereby forming a layered structure comprising: a polycrystalline substrate layer; and a metal-doped superconducting layer comprising a thickness ts greater than 10 μm and less than or equal to 50 μm, wherein the metal-doped superconducting layer comprises the metal ions.