35 results about "Transition metal nanoparticles" patented technology

The embodiment of the invention discloses a nano composite material and a preparation method, a use method and a device thereof, and the nano composite material is characterized by comprising a first nano particle and a second nano particle which are combined; the first nano-particles are transition metal nano-particles, and the second nano-particles are one or a combination of the following materials: lithium nitride nano-particles, lithium oxide nano-particles, lithium phosphide nano-particles, lithium selenide nano-particles and lithium sulfide nano-particles. The nano composite material can be subjected to magnetic regulation and control under low voltage, and high-speed and high-density electronic spin information storage is realized.

The invention relates to the technical field of gas sensors, in particular to a sensing material based on nanoparticle loading, a preparation method of the sensing material and a gas sensor, and the sensing material comprises a substrate material and transition metal nanoparticles and / or precious metal alloy nanoparticles loaded on the surface of the substrate material; the substrate material comprises one or more of defect oxide, MOF, sulfide, carbide, MXene and phosphide. The semiconductor characteristic of the substrate material is combined with the hydrogen dissociation capability of the transition metal nanoparticles and / or the noble metal alloy nanoparticles, so that the adsorption and dissociation efficiency of hydrogen can be improved; by loading the nanoparticles on the substrate material, the interface hydrogen overflow process is regulated and controlled, the energy barrier of hydrogen overflow is reduced, and the sensitivity and response speed of the hydrogen sensor are further improved. By optimizing the interface structure between the nanoparticles and the substrate material, the process of interface hydrogen overflow is improved, and the hydrogen sensing performance is improved.

The present invention discloses a composite carbon nanotube material containing sulfur and carbon nanotubes. The carbon nanotubes are curved or spiral in shape, have transition metal nanoparticles at their ends, and are hollow. The composite carbon nanotube material can be used in lithium-sulfur batteries to mitigate sulfur expansion, promote uniform sulfur distribution, reduce polysulfide shuttling, and improve the capacity, rate capability, and cycle stability of lithium-sulfur batteries.

A method for preparing a transition metal electrochemical catalyst according to an embodiment of the present disclosure includes dissolving a nitrogen precursor and a transition metal precursor in a polyol-based solvent so as to prepare a solution in which transition metal ions and free anions are coordinated, and mixing same with a support so as to prepare a mixture, igniting the mixture so as to carbonize the polyol-based solvent, thereby forming transition metal nanoparticles encompassed by carbon, performing heat treatment in order to carbonize remaining organic matter contained in the mixture, and removing, through acid treatment, impurities and transition metal nanoparticles not encompassed by carbon, and then removing remaining acid through washing and additional heat treatment, thereby a nanocatalyst having a structure in which a single-atom transition metal-nitrogen bonding structure and / or transition metal nanoparticles encompassed by carbon exist is synthesized.

The invention provides a nickel-based heterogeneous interface nano composite material for microwave thermal-power diagnosis and treatment integration. The nickel-based heterogeneous interface nano composite material is of a core-shell structure and comprises an inner core and an outer shell, and the outer shell covers the surface of the inner core; the inner core comprises a metal organic framework material of which the surface is loaded with nickel metal nanoparticles and transition metal nanoparticles; the shell comprises a covalent organic framework material. The nickel-based heterogeneous interface nano composite material has the characteristic of high microwave absorption performance in a medical frequency band, and has an ultrasonic imaging diagnosis function on the basis of meeting microwave thermal therapy and microwave power therapy. According to the nickel-based heterogeneous interface nano composite material, multiple functional units are organically combined, collaborative diagnosis and treatment of tumor microwave thermal therapy and microwave power therapy can be achieved under the guidance of real-time imaging diagnosis, and the nickel-based heterogeneous interface nano composite material has important significance in clinical diagnosis and treatment application of tumors.

The invention discloses a transition metal anchored heteroatom doped RuO2 fiber aerogel electrocatalyst and a preparation method and application thereof.The preparation method includes the steps that RuO2 fibers are prepared through an electrostatic spinning technology to serve as a catalytic substrate, and transition metal nanoparticles are anchored to a continuous conductive network formed by the RuO2 fibers through a metal self-organization technology; finally, one-dimensional fibers are recombined into a three-dimensional graded porous aerogel structure through a freeze drying technology, an efficient channel is provided for electrolyte mass transfer and gas product escape, and uniform distribution and full exposure of active sites are achieved. Wherein the transition metal nanoparticles are converted into M-OH in situ in the OER process, and then a deprotonation reaction is carried out to form a Lewis acid layer. Doped heteroatoms can be oxidized in an alkaline environment to form anion groups with negative electricity, and Cl <-> erosion can be effectively resisted through a charge repulsion effect. By establishing a Lewis acid-anionic charge repulsion dual corrosion-resistant mechanism, the bottleneck of poor stability of the catalyst in a seawater high-salt environment can be broken through.

The present application relates to the technical field of functional nanomaterials, and in particular to a tadpole-shaped functional carbon nanotube as well as a preparation method and application thereof.The tadpole-shaped functional carbon nanotube provided by the present application has the following characteristics: (1) the whole is a nitrogen-doped U-shaped carbon nanotube; (2) group VIII transition metal nanoparticles are encapsulated at the bottom of the U-shaped carbon nanotube to form the head of the tadpole-shaped carbon tube; and (3) a single-atom zinc is inlaid on the tadpole-shaped tail carbon tube.The tadpole-shaped functional carbon nanotube can realize the cascade of four tumor treatment methods of chemical kinetics, photodynamic kinetics, photo-thermal and chemotherapy, and achieve a beneficial effect of synergistic treatment of tumors.

The invention discloses a magnesium-based solid hydrogen storage material as well as a preparation method and application thereof, and relates to the technical field of solid hydrogen storage materials. The magnesium-based solid hydrogen storage material comprises a magnesium-based alloy and a composite catalyst, and the magnesium-based alloy comprises the following chemical components in percentage by mass: 1.0-10.0% of nickel, 1.0-5.0% of aluminum and the balance of magnesium; the composite catalyst is transition metal nanoparticles loaded on a carbon nanomaterial; the mass percent of the composite catalyst in the magnesium-based solid hydrogen storage material is 1%-20%. Through the synergistic effect of all the components, the material shows excellent hydrogen absorption kinetics at a low temperature of 250 DEG C, can absorb more than 6.0 wt% of hydrogen within 10 minutes, and can obviously reduce dehydrogenation activation energy to about 75 kJ / mol, so that the low-temperature kinetics performance and cycling stability of the material are comprehensively improved; the technical problem that a traditional magnesium-based material is difficult to consider high capacity, rapid dynamics and long service life at the same time is solved.

The present invention relates to nucleic acid-adsorbing materials and the applications thereof. The nucleic acid-adsorbing materials comprise transition metal nanoparticles coated with one or more modulators, and may further comprise a sensing carrier to form a nanocomposite. The nucleic acid-adsorbing materials can adsorb short or small polynucleotide fragments in a sample solution, which leads to a change in the absorption spectrum and can be detected, quantitated, or characterized with a spectrophotometer.

This invention discloses a two-dimensional layered ammonia oxidation catalyst based on MXene, its preparation method, and its application in low-temperature ammonia fuel cells. The catalyst comprises an active component and a support. The active component is one or two of the transition metals Pt, Ir, and Pd, and the support is accordion-shaped MXenes. The catalyst support prepared by this invention has a large specific surface area, in which the transition metal nanoparticles are uniformly dispersed and have strong interactions with the MXenes, which can significantly improve its ammonia electrocatalytic oxidation activity, showing good application prospects in ammonia fuel cells.

The application provides a rare earth-based permanent magnetic single crystal nanomaterial and a preparation method thereof, and belongs to the technical field of magnetic rare earth alloy nanomaterials, and the preparation method comprises the following steps: S1, rare earth metal is bombarded by an Ar / H2 ion beam to obtain rare earth hydride nanoparticles; S2, transition metal salt, oleic acid and oleylamine are mixed and reacted to obtain transition metal nanoparticles; S3, the rare earth hydride nanoparticles and the transition metal nanoparticles are ultrasonically dispersed to obtain rare earth hydride / transition metal nanocomposite powder; S4, the rare earth hydride / transition metal nanocomposite powder is subjected to vacuum annealing treatment to obtain the rare earth-based permanent magnetic single crystal nanomaterial; or, the rare earth hydride / transition metal nanocomposite powder is sequentially subjected to vacuum annealing treatment and ammonia atmosphere annealing treatment to obtain the rare earth-based permanent magnetic single crystal nanomaterial. The preparation method has the advantages of low annealing temperature, high yield and the like, and can be used for large-scale preparation of the rare earth-based permanent magnetic single crystal nanomaterial.

Provided is a method for producing a transition metal nanoparticle support, the method including the steps of: (I) obtaining a mixture by mixing a polymeric organic compound, an oxide of at least one transition metal or a hydroxide of at least one transition metal, and an oxide or hydroxide of at least one element selected from alkali metals, alkaline earth metals, aluminum, and lanthanoids; (II) obtaining a solid residue by heating the mixture; and (III) obtaining, from the solid residue, a support in which nanoparticles of the transition metal are supported.

This invention belongs to the field of catalysis technology, specifically relating to a carbon catalytic material co-doped with single-atom and multi-atom transition metals, its preparation method, and its application. The invention involves plasma calcining activated carbon material with a transition metal salt to obtain a carbon material loaded with multi-atom transition metal nanoparticles. Then, through acid etching, some of the multi-atom transition metal nanoparticles are dispersed into single-atom transition metals, thus obtaining a carbon catalytic material simultaneously loaded with single-atom and multi-atom transition metal nanoparticles. Compared to single-atom transition metals, multi-atom transition metal nanoparticles exhibit stronger bonding and stability with the carbon material, and are less prone to aggregation during catalysis, thereby improving the stability of the carbon catalytic material. Furthermore, activation, plasma calcination, and acid etching increase the porous structure of the carbon material surface, increasing its specific surface area, which is beneficial for increasing active sites and thus improving catalytic activity.

This invention belongs to the field of electrochemical energy storage materials and devices, specifically relating to an artificial interface layer for lithium anodes, its preparation method, and its application. The artificial interface layer for lithium anodes provided by this invention comprises a composite of transition metal nanoparticles and carbon, and a fluoropolymer. It solves the problem in existing technologies where the use of low-ionic-conductivity organic binders in artificial SEI layers leads to slow lithium-ion transport kinetics at the interface, making it difficult to balance high mechanical strength and rapid ion transport. This results in an artificial interface layer with excellent rate performance and cycle stability.

Embodiments of the present application provide an electrode material for a spin capacitor, a spin capacitor, and a preparation method thereof. The electrode material includes transition metal nanoparticles derived from metal-organic frameworks. In the embodiments of the present application, the monodisperse metal-organic framework-derived transition metal nanoparticles have advantages such as small size, large specific surface area, and regular morphology, and the interfacial charge is sufficient to adsorb a large number of ions, thereby achieving an ideal spin specific capacity.

The application provides a carbon-based transition metal nanoparticle and single-atom synergistic electrocatalyst, a preparation method, application and a zinc-air battery, and belongs to the technical field of electrocatalysis and metal-air batteries. In the application, through the competitive anchoring and limited action of a nitrogen-containing metal chelating agent and a nitrogen-rich precursor on metal atoms in a pyrolysis process, in-situ construction and stable coexistence of transition metal nanoparticles and single atoms are realized in one step, a single-atom-nanoparticle synergistic structure is formed, the single-atom sites dominate the efficient oxygen reduction reaction, and the nanoparticle sites dominate the efficient oxygen evolution reaction. The method has the advantages of simple process, good repeatability, easy scaling from a kilogram to a kilogram, and consistent catalyst structure performance after scaling. The membrane electrode and the zinc-air battery based on the catalyst show excellent bifunctional catalytic activity, high power density and long cycle stability, and provide a complete technical solution from materials to devices for the commercialization of high-performance and low-cost zinc-air batteries.

The invention provides an amphiphilic nano-metal catalyst for reducing viscosity of thickened oil while drilling as well as a preparation method and application of the amphiphilic nano-metal catalyst, and belongs to the field of oilfield chemistry in the petroleum industry. The preparation method of the catalyst comprises the following steps: dispersing nano silicon dioxide in absolute ethyl alcohol, adding a hydrophilic monomer and deionized water, and reacting to obtain modified nano silicon dioxide; mixing the modified nano silicon dioxide, a hydrophobic monomer and an ester monomer, and reacting to obtain amphiphilic modified nano silicon dioxide; the preparation method comprises the following steps: dispersing transition metal salt and amphiphilic modified nano silicon dioxide in ethanol, dropwise adding a reducing agent solution, and reacting. The catalyst disclosed by the invention is formed by loading transition metal nanoparticles on the surface of amphiphilic modified nano silicon dioxide, has good compatibility with an oil phase and a water phase, can realize high-efficiency viscosity reduction of heavy oil at a relatively low temperature, can adapt to the temperature lower than 150 DEG C in a shaft environment, can also keep a lasting high-efficiency viscosity reduction effect of the heavy oil, and has a good application prospect. Meanwhile, the heat stability is good.

The invention discloses a transition metal nanoparticle graphene oxide self-assembled catalytic membrane for effectively removing oxysalt in a water body, and belongs to the technical field of water treatment functional membranes. A transition metal nanoparticle (such as iron, manganese and the like) dispersion liquid and a graphene oxide dispersion liquid are directly mixed, and the composite catalytic membrane is formed through self-assembly by utilizing the interaction between nanoparticles and graphene oxide lamellas. Metal ion adsorption and in-situ reduction steps are not needed, the process is simple and efficient, and large-scale preparation is easy. The obtained composite membrane has a remarkable nano confinement effect, can efficiently activate sulfite to generate reducing free radicals and rapidly degrade oxysalt pollutants such as bromate in a water body, the removal rate of 80 micrograms / L bromate in 3 minutes exceeds 96%, and the composite membrane has good stability and reusability.

The invention belongs to the related technical field of batteries, and particularly relates to a perovskite material and a preparation method thereof, and a solid oxide electrolytic tank and a cathode thereof. According to the preparation method of the perovskite material provided by the invention, through high-temperature annealing and reducing atmosphere heat treatment, CeO2 nanocrystals and transition metal nanoparticles are sequentially subjected to in-situ precipitation on a perovskite oxide, so that a heterostructure of a CeO2-transition metal nanoparticle catalyst with thermodynamic stability is formed. Compared with an impregnation method and an in-situ precipitation method, the CeO2-transition metal nanoparticles obtained by the in-situ precipitation method are uniformly distributed on a perovskite oxide matrix and have a very good nesting effect with the matrix, the micro-nano structure is more stable, the phenomenon of performance reduction caused by particle aggregation in the operation process of the cell can be effectively prevented, and the performance of the cell is improved. And the innovative CeO2-transition metal nanoparticle catalyst is introduced, so that the catalytic activity of the electrode material and the overall performance of the electrolytic tank can be greatly improved.

The present invention provides an electrode catalyst which has high catalytic activity while maintaining good durability, substance conductivity, and electrical conductivity, and which can be manufactured at a low cost.　The present invention provides an electrode catalyst which is composed of a void-containing body having voids, wherein: the void-containing body is provided with a core part and a skin layer that covers the core part; the core part is composed of a metal; the skin layer is composed of Ni and an oxide that contains a second metal; the second metal is a metal that is different from Ni; in addition, the skin layer is loaded with transition metal nanoparticles that are dispersed on the surface of the skin layer; and the particle diameter of the transition metal nanoparticles is smaller than the particle diameter of the metal and the particle diameter of the oxide.

The application provides a Ru-based catalyst for hydrogen production by ammonia decomposition, a preparation method and application thereof, and belongs to the technical field of hydrogen production by ammonia decomposition. The Ru-based catalyst comprises a carrier and active metal nanoparticles loaded on the carrier, the active metal nanoparticles comprise transition metal nanoparticles loaded on the carrier and a Ru atomic layer coated on the transition metal nanoparticles, and the mass fraction of the Ru atomic layer is 0.2-3wt% based on the total mass of the Ru-based catalyst being 100wt%. In the Ru-based catalyst, the Ru atomic layer is coated on the surface of the transition metal nanoparticles to form active metal nanoparticles, the utilization rate of Ru is improved, meanwhile, the inner transition metal nanoparticles have significant electron transfer capacity and strain effect on the surface Ru atomic layer, the adsorption energy of the catalyst for intermediate reaction products in hydrogen production by ammonia decomposition is optimized, and the catalytic activity is improved.

The invention discloses a transition metal nanoparticle embedded biomass-derived nitrogen-doped carbon electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of H2O2 preparation. The problems that a transition metal-carbon material catalyst is low in H2O2 selectivity, complex in preparation process and not environmentally friendly are solved. The preparation method of the electrocatalyst comprises the following steps: carrying out a hydrothermal reaction on a biomass fiber material and concentrated alkali liquor, then carrying out a hydrothermal reaction on obtained biomass cellulose, transition metal salt and an organic ligand to obtain a metal-loaded nitrogen-containing biomass carbon material, and carrying out heat treatment on the biomass carbon material to obtain the electrocatalyst. The electrocatalyst is used as a cathode to electrocatalyze two-electron oxygen reduction to synthesize H2O2. According to the invention, a nitrogen source easy to pyrolyze and oxidized fibers are coordinated and combined through hydro-thermal synthesis, and holes are etched and formed in the catalyst during high-temperature pyrolysis, so that the mesoporous content of the catalyst is increased; the catalyst has good ability of two-electron oxygen reduction electrosynthesis of H2O2, and the H2O2 selectivity and yield are high.

The invention provides a composite material, a preparation method thereof and a friction volt nano-generator, and the preparation method comprises the following steps: mixing a polymer monomer and a protonic acid solution to obtain a mixed modified solution, and placing a substrate in the mixed modified solution for reaction to obtain a mixed material; and mixing the mixed material with the metal oxide nanoparticles, adding an oxidizing agent to carry out polymerization reaction, taking out the composite substrate, and carrying out post-treatment to obtain the composite material. The polymer is modified through the synergistic effect of protonation and a metal-nitrogen coordination bond, synchronous improvement of material performance and stability is achieved, and the carrier concentration and conductivity of the polymer are effectively improved through the protonation effect of protonic acid; the transition metal nanoparticles and amido or imino in a polymer molecular chain form a firm coordinate bond, so that the interface bonding force and structural integrity between inorganic nanoparticles and an organic polymer matrix are greatly enhanced.

This invention discloses a double-layer-coated metal particle catalyst, its preparation method, and its application in the catalytic synthesis of pentanediamine. Transition metal nanoparticles are the active sites for decarboxylation reactions. Using them as the core of the catalyst, firstly, the rich pore structure of a molecular sieve is utilized to confine the metal nanoparticles, resulting in highly dispersed metal nanoparticles with a size of ~1.5 nm, preventing agglomeration during the reaction. Secondly, an acid-resistant silicon shell is grown in situ on the outer layer of the molecular sieve using a hydrothermal synthesis crystallization method to prevent corrosion from inorganic acids in the reaction solution. Compared with single-layer-coated catalysts, the double-layer-coated catalyst of this invention significantly improves the catalyst's stability. After 5 cycles, the lysine conversion rate reaches 80%, and the pentanediamine selectivity is 60%. This invention provides a new industrialization opportunity for the chemical decarboxylation of lysine to produce pentanediamine and has promising industrial application prospects.

The application provides a carbon-coated transition metal nanocomposite and application thereof. The nanocomposite has a core-shell structure with a shell layer and a core. The shell layer is a nitrogen and oxygen doped graphitized carbon layer, and the core is a transition metal nanoparticle. The nanocomposite is a mesoporous material with at least one mesopore distribution peak. The nanocomposite has abundant mesoporous structures and is a catalytic material with excellent performance. The nanocomposite can be used as a catalytic oxidation catalyst to treat volatile organic compounds in industrial waste gas and has a good industrial application prospect.

The invention relates to a method for preparing a coating solution, comprising the steps of dissolving (100) a copolymer of vinylpyrrolidone and vinyl ester in a glycol-based solvent, adding (200) a base or an acid to the solution to convert the copolymer of vinylpyrrolidone and vinyl ester into a copolymer of vinylpyrrolidone and vinyl alcohol, adding (300) a transition metal salt to the solution, and heating (400) the solution under stirring to build transition metal nanoparticles in the solution, wherein the method is performed in one-pot fashion.

The invention discloses a hydrogen storage hollow glass microsphere, a preparation method thereof and a hydrogen charging and discharging method. The hydrogen storage hollow glass microspheres are composed of borosilicate glass ball walls and hollow cavities wrapped by the ball walls, transition metal nanoparticles are dispersed in the borosilicate glass ball walls, and the transition metal nanoparticles are products obtained by reducing transition metal oxide nanoparticles through hydrogen. The preparation method comprises the steps of preparation of uniform glass frits, preparation of primary hollow glass microspheres, preparation of hydrogen storage hollow glass microspheres and the like. The hydrogen charging and discharging method comprises the two steps of hydrogen charging of the hydrogen storage hollow glass microspheres and hydrogen discharging of the hydrogen storage hollow glass microspheres. Under the catalytic action of the transition metal nanoparticles, the hydrogen adsorption free energy is reduced, the permeation and diffusion rate of hydrogen is increased, the hydrogen permeation coefficient of the hydrogen storage hollow glass microspheres at the low temperature of 100-200 DEG C is increased, the operation temperature of hydrogen charging and discharging is reduced, and the energy consumption is reduced.

The application belongs to the technical field of catalytic materials, and particularly relates to a porous catalytic material based on hyperbranched polyamide-amine and application thereof in biomass hydrodeoxygenation reaction. The porous catalytic material based on hyperbranched polyamide-amine is prepared by using maleic anhydride modified hyperbranched polyamide-amine as a carrier, loading transition metal nanoparticles on the carrier, and then performing cross-linking reaction between the carrier and a silicone prepolymer. The porous catalytic material based on hyperbranched polyamide-amine has a hierarchical pore structure, a high specific surface area, excellent mechanical strength and outstanding thermal stability. The cavity structure of the maleic anhydride modified hyperbranched polyamide-amine can effectively inhibit the agglomeration of transition metal nanoparticles at high temperatures. The silicone cross-linking network endows the porous catalytic material based on hyperbranched polyamide-amine with structural stability at high temperatures, so that the porous catalytic material based on hyperbranched polyamide-amine can exhibit high activity, high selectivity and excellent cycle stability in biomass hydrodeoxygenation reaction.

The present invention provides an amphiphilic nanometal catalyst for viscosity reduction of heavy oil while drilling, as well as its preparation method and application, belonging to the field of oilfield chemistry in the petroleum industry. The catalyst preparation method of the present invention comprises the following steps: dispersing nanosilica in anhydrous ethanol, adding a hydrophilic monomer and deionized water, and reacting to obtain modified nanosilica; mixing the modified nanosilica, a hydrophobic monomer, and an ester monomer, and reacting to obtain amphiphilic-modified nanosilica; and dispersing a transition metal salt and the amphiphilic-modified nanosilica in ethanol, dropwise adding a reducing agent solution, and reacting to obtain the catalyst. The catalyst of the present invention comprises amphiphilic-modified nanosilica with transition metal nanoparticles loaded on its surface. The catalyst has good compatibility with both oil and water phases, can achieve efficient viscosity reduction of heavy oil at relatively low temperatures, can adapt to temperatures below 150°C in wellbore environments, maintains a long-lasting and efficient heavy oil viscosity reduction effect, and exhibits good thermal stability.

The invention belongs to the technical field of new materials, and particularly relates to preparation and doping modification of rare earth oxide loaded transition metal nanoparticles for low-pressure ammonia synthesis. The supported synthetic ammonia catalyst provided by the invention comprises a cerium dioxide carrier (CeO2) with characteristic morphology and rich oxygen vacancies, a lanthanum-doped and modified cerium dioxide carrier (La-CeO2), and a metal nano-material which is supported on a rare earth metal oxide carrier and is generated through high-temperature gas phase reduction, the preparation method comprises the following steps: dissolving rare earth metal nitrate and an organic ligand in N-N dimethylformamide, then adding an initiator and a stabilizer, putting an obtained mixed solution into a hydrothermal kettle, and carrying out solvothermal reaction at high temperature; the preparation method comprises the following steps: centrifuging, washing, drying and calcining a metal organic framework precursor obtained by solvothermal reaction to prepare a rare earth metal oxide carrier, and loading transition metal chloride on the rare earth metal oxide carrier by taking acetone as a solvent through a rotary evaporation method; and performing high-temperature treatment in a reducing atmosphere to obtain the transition metal nanoparticle loaded rare earth metal oxide ammonia synthesis catalyst. The supported ammonia synthesis catalyst has very strong nitrogen activation capability and very high low-pressure ammonia synthesis performance.