364 results about "Alloy nanoparticle" patented technology

The invention discloses a preparation process of a modified porous carbon material catalyst. The preparation process comprises the following steps: (1) mixing and calcining a biomass precursor and a template agent to prepare graded porous carbon; (2) low-frequency plasma pretreatment and high-frequency plasma fluorination modification are adopted; (3) introducing the pulse plasma into a nitrogen doping site; (4) spraying ionic liquid and activating H2 plasma to form a B / F co-doped layer; and (5) loading alloy nanoparticles such as PtRu through pulse electrodeposition. According to the obtained catalyst, biomass derived porous carbon serves as a carrier, a fluorine / nitrogen co-doped active layer is constructed on the surface of the carrier through multi-frequency plasma synergistic modification and ionic liquid auxiliary modification, superfine precious metal nanoparticles are loaded, the hydrogen evolution overpotential of the catalyst is smaller than or equal to 28 mV under the current density of 10 mA / cm < 2 >, the activity attenuation is smaller than 5% after 1000 times of circulation, and the catalyst has a good catalytic activity. The water electrolysis hydrogen production device is suitable for a large-scale water electrolysis hydrogen production device.

The invention relates to the technical field of high polymer materials, in particular to a high-entropy alloy modified polyvinyl alcohol / polypyrrole composite hydrogel material as well as a preparation method and application thereof. Firstly, a polypyrrole aqueous solution is prepared through chemical oxidative polymerization, and high-entropy alloy nanoparticles are synthesized through a Joule thermal technology; and then mixing a polypyrrole aqueous solution, the high-entropy alloy nanoparticles and a polyvinyl alcohol aqueous solution, and adding a cross-linking agent and a catalyst to prepare the high-entropy alloy modified polyvinyl alcohol / polypyrrole composite hydrogel material. According to the composite hydrogel, under the synergistic effect of the high-entropy alloy, the light absorption performance is remarkably improved, wide-spectrum efficient absorption of ultraviolet rays, visible light and near-infrared light in a solar spectrum is achieved, and meanwhile the mechanical strength and chemical stability of the material are enhanced. The preparation process is simple, the cost is low, and the prepared composite hydrogel has wide application prospects in the fields of seawater desalination, wastewater treatment and the like as a solar interface evaporator.

The invention discloses a high-entropy alloy nanoparticle as well as application and a preparation method thereof, and belongs to the technical field of mature biological membrane removal. The high-entropy alloy nanoparticles comprise the following raw materials: metal powder Fe, Ni, Mn, Nb, Cu and Ag; wherein the molar ratio of Fe to Ni to Mn is 1: 1: 1; the molar ratio of Nb to Fe is x, the molar ratio of Cu to Fe is y, the molar ratio of Ag to Fe is z, x is larger than or equal to 1.0 and smaller than or equal to 12.0, y is larger than or equal to 0.5 and smaller than or equal to 1.5, and z is larger than or equal to 0.05 and smaller than or equal to 0.25. According to the high-entropy alloy nano-particles, the biological membrane removal effect is further enhanced through component regulation and control, and the high-entropy alloy nano-particles have excellent photothermal conversion capacity under sunlight irradiation, so that the biological membrane removal performance is more excellent; and an efficient and long-term stable biofilm removal effect can be realized by using a very small amount of high-entropy alloy nanoparticles.

The invention discloses gold-titanium alloy nanoparticles as well as a wet chemical preparation method and application thereof. The preparation method comprises the following steps: in a water-free and oxygen-free environment, uniformly dissolving a gold salt, a titanium salt and a support carrier in an ether solvent, mixing with lithium triethylborohydride, transferring into a high-pressure reaction kettle, stirring and heating to 180-220 DEG C under the inert gas pressure of 0.5-1 MPa, and keeping the temperature for 1-4 hours; and after the mixture is cooled to the room temperature, the product solution is diluted with normal hexane, cleaning and drying are conducted, and the gold-titanium alloy nanoparticles are obtained. According to the invention, gold salt and titanium salt adsorbed on a support carrier are reduced by using a strong reducing agent under the conditions of high temperature and high pressure, and highly dispersed nanoparticles with uniform particle size are prepared; by introducing the supporting carrier, the problem that the particle size is increased due to agglomeration of alloy nanoparticles at high temperature is avoided, the catalytic performance and the anti-sintering performance of the catalyst are enhanced through strong interaction with the carrier, and the catalyst has wide application prospects in the fields of CO thermal oxidation and CO electrochemical oxidation.

The invention discloses a low-temperature solder for a photovoltaic solder strip of an HJT heterojunction and a preparation method of the low-temperature solder, and belongs to the technical field of packaging materials. The solder is based on tin-bismuth alloy, and the high-entropy alloy nanoparticles and the soldering flux are added, so that the melting point of the solder is remarkably reduced, reliable interconnection is achieved at the temperature lower than 250 DEG C, and damage of high temperature to an HJT battery piece is avoided. The low-temperature solder has excellent wettability, mechanical strength and corrosion resistance, the reliability of a photovoltaic module can be effectively improved, and the service life of the photovoltaic module can be effectively prolonged. In addition, lead-free environment-friendly materials are adopted, and the green and environment-friendly requirements are met. The preparation method is simple and feasible and is suitable for large-scale production. The invention provides an efficient, environment-friendly and low-cost interconnection material and process for the HJT heterojunction battery piece, and has a wide application prospect.

The invention discloses a method for preparing a carbon-coated high-entropy alloy by a photo-reduction method. The method comprises the following steps: (a) dissolving carbon quantum dots and transition metal salt in absolute ethyl alcohol to prepare a solution A; (b) dispersing a conductive carbon material into the solution A in the step (a) to prepare dispersion liquid B; (c) irradiating the dispersion liquid B obtained in the step (b) under a light source for 0.5-6 hours to obtain dispersion liquid C; and (d) carrying out centrifugal separation on the dispersion liquid C obtained in the step (c) to obtain a solid, and cleaning the solid to obtain the carbon-coated high-entropy alloy. According to the method, amorphous carbon can coat high-entropy alloy nanoparticles or atomic clusters, the catalytic activity and durability of the precious metal are remarkably improved, and the product is particularly suitable for the fields of hydrogen production through water decomposition, fuel cells and the like, can inhibit the reverse water decomposition reaction on the surface of the precious metal and has the advantages of being high in catalytic activity and good in cycling stability.

The invention belongs to the technical field of catalytic materials, and particularly relates to high-entropy alloy nanoparticles used as a biocatalyst and application of the high-entropy alloy nanoparticles. The PtFeCuCoNi high-entropy alloy nano-particles with pH adaptability are developed through a one-step solvothermal synthesis method, it is found that the PtFeCuCoNi high-entropy alloy nano-particles can serve as potent oxidase, can generate reactive oxygen species (ROS) and effectively kill bacteria such as MRSA under the acidic condition, and can play the functions of superoxide dismutase and catalase under the neutral condition, so that the PtFeCuCoNi high-entropy alloy nano-particles with the pH adaptability can be used for effectively killing bacteria such as MRSA. Active oxygen in cells is efficiently removed, oxidative stress is relieved, and the cell protection effect is achieved.

The invention discloses a non-noble metal M-doped carbon-supported PtM alloy catalyst as well as a preparation method and application thereof, relates to a PtM alloy catalyst as well as a preparation method and application thereof, and aims to solve the technical problems of poor catalytic activity and insufficient adaptability of the existing PtM alloy catalyst. According to the catalyst, PtM alloy nanoparticles are uniformly supported on a non-noble metal M-doped carbon carrier, wherein M is Co, Fe, Zn, Ni or Ce. The preparation method comprises the following steps: M-doped carbon is taken as a carrier, Pt is loaded by adopting a microwave reduction method, then the non-noble metal M-doped carbon-loaded PtM alloy catalyst is obtained through high-temperature alloying, the mass activity of PtCo / Co-NC-C and the mass activity of Pt / Fe-NC-C are 0.381 mA / [mu] gPt and 0.285 A / mgPt respectively and are about 3.4 times and 2.5 times of the mass activity of 20% Pt / C, and the catalyst can be used in the field of proton exchange membrane fuel cells.

The invention discloses a hydrogen energy fuel cell catalyst carrier based on a graphene graft polymer, which is characterized in that two-dimensional graphene is used as a substrate, the surface of the two-dimensional graphene is modified with an oxygen-containing functional group, and a functional polymer branch chain containing nitrogen, sulfur or phosphorus heteroatoms is covalently grafted to form a local three-dimensional network winding structure; the carrier is loaded with platinum, palladium, ruthenium and other metal or alloy nanoparticles, the particle size is 2-8 nm, the loading capacity is 10%-40%, and the particles are anchored to polymer functional sites or reduced in situ to a graphene defect area through coordination. A polymer branch chain has pH responsiveness and can adjust the local proton transmission efficiency; the grafting density is 3-15 grafting points per 100 carbon atoms, so that high dispersion and stable anchoring of metal particles are effectively realized; the specific surface area of the carrier is 400-800m < 2 > / g, the electrochemical active area is not less than 80m < 2 > / g, and the activity retention rate is greater than 80% after 5000 circles of accelerated durability tests. The activity, the stability and the proton conduction performance of the catalyst are remarkably improved, and the catalyst is suitable for high-performance fuel cells.

The invention relates to the technical field of energetic materials, in particular to a laser response type high-entropy alloy-based initiating explosive material and a preparation method thereof. The initiating explosive material is mainly formed by uniformly loading a heat-sensitive high-energy compound (such as lead stilbeneate or hexa (4-amino-3, 5-dinitropyrazole) copper) on high-entropy alloy nanoparticles containing five or more metal elements, wherein the heat-sensitive high-energy compound is such as lead stilbeneate or hexa (4-amino-3, 5-dinitropyrazole) copper. The preparation method comprises the following steps: mixing acetylacetone metal salt, a surfactant and a reducing agent in an organic solvent, and stirring and reacting at 180-220 DEG C to prepare high-entropy alloy nanoparticles; the nano particles and a high-energy compound are co-dispersed in a mixed solvent containing a dispersing agent, ultrasonic treatment is carried out to form suspension liquid, and freeze drying is carried out to obtain the nano particles. The method is characterized in that the excellent photo-thermal conversion performance of the high-entropy alloy is utilized, under low laser energy irradiation, a high-energy compound can be effectively excited, and stable detonation of secondary charge CL-20 is successfully achieved. According to the invention, the problems of high response threshold and low output energy of the existing laser initiating explosive material are solved.

The invention discloses a high-entropy alloy nanoparticle and application thereof. The nanoparticles are formed by specific noble metals, have multienzyme activity, and can effectively remove ROS (reactive oxygen species) at an inflammation part and remodel the free radical steady state of the inflammation part; the skin inflammation reaction can be inhibited by adjusting a JAK-STAT signal channel; skin inflammation caused by psoriasis can be relieved by down-regulating inflammatory factors IL-6, IL-17 and IL-23, and a new treatment scheme is provided for psoriasis treatment.

The invention relates to a PEM ternary alloy catalyst for water electrolysis hydrogen production and a preparation method thereof, and belongs to the technical field of water electrolysis catalysts. 1-butyl-3-methylimidazolium tetrafluoroborate is introduced in the generation of a carrier manganese dioxide to increase the specific surface area of the carrier, fluorine doping and oxygen vacancy construction are realized on the surface of the carrier through hydrofluoric acid treatment, and then a metal precursor is dispersed through an ethylene glycol / water system; and finally, loading and alloying of the alloy nanoparticles are completed through hydrothermal reduction and heat treatment. The morphology and electronic structure of the carrier are synergistically regulated and controlled through ionic liquid and fluorine doping, the specific surface area and active sites are remarkably increased, strong interaction of metal and the carrier is achieved through ternary alloy component optimization, and the oxygen evolution reaction activity and stability of the catalyst and the precious metal utilization rate are effectively improved.

The invention belongs to the field of hydrogen sensors, and particularly relates to an MEMS hydrogen sensor based on a high-entropy alloy and a preparation method of the MEMS hydrogen sensor. The hydrogen sensor comprises an insulating substrate, an interdigital electrode and a hydrogen sensitive layer, the hydrogen sensitive layer is formed by compounding high-entropy alloy nanoparticles composed of at least five transition metal elements and a semiconductor metal oxide substrate, and the high-entropy alloy nanoparticles are uniformly dispersed on the surface of the semiconductor metal oxide substrate to form a heterojunction; the atomic percent of each transition metal element in the high-entropy alloy nanoparticles is 5%-35%; the semiconductor metal oxide substrate is of a SnO2 or ZnO nano structure, and the specific surface area is larger than or equal to 50 m < 2 > / g. The preparation method is the preparation method of the hydrogen sensor. The hydrogen sensor provided by the invention has an ultralow hydrogen detection limit, the response speed is within a second level, the consumption of noble metal is greatly reduced, and the activity attenuation in a high-temperature environment is small.

The invention discloses a FeNi-C-CNTs-carbon fiber composite material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) cutting carbon fibers into short fibers, dispersing the short fibers into fiber bundles, fixing the fiber bundles, and carrying out electrostatic dispersion; (2) spraying an adhesive on the surface of the dispersed carbon fiber to form an adhesive layer on the surface of the carbon fiber, and then pre-curing the adhesive; and (3) carrying out chemical vapor deposition by adopting a horizontal tube furnace and taking a mixture of ferric acetylacetonate and nickel acetylacetonate as a metal precursor. In the FeNi-C-CNTs-carbon fiber composite material, the FeNi alloy nanoparticles and the carbon nanotubes cooperatively construct a three-dimensional conductive network, wave absorbing mechanisms such as magnetic loss, dielectric loss and multiple scattering are strengthened by means of the unique structure, the wave absorbing performance is remarkably improved, the effective frequency band is widened, and the composite material has excellent microwave absorbing performance and structural stability.

The invention relates to a carbon-supported ternary metal ordered alloy nano-material as well as a preparation method and application thereof. The alloy nano-material comprises a carbon carrier and ternary metal ordered alloy nano-particles loaded on the surface or in a pore structure of the carbon carrier, the ternary metal ordered alloy nanoparticles comprise precious metal, transition metal and rare earth metal, and three metal atoms are arranged in order. The preparation method comprises the following steps: uniformly mixing a carbon carrier, a noble metal precursor, a transition metal salt precursor, a rare earth metal salt precursor and a nitrogen-containing precursor, and then calcining to obtain the carbon-supported ternary metal ordered alloy nano material. Compared with the prior art, the ternary ordered alloy is formed by introducing the rare earth metal, and the electronic structure of the precious metal can be effectively regulated and controlled, so that the catalytic activity of the ternary ordered alloy is improved.

The invention relates to the technical field of precoated sand casting, and discloses a precoated sand casting production line based on an intelligent casting island, the precoated sand casting production line comprises a machine body, a sand feeding pipe, a negative pressure sand suction pipe, a distance adjusting piece and a rotatable transmission shaft are respectively mounted in the machine body, and the distance adjusting piece is in transmission connection with two mold frames which are symmetrically arranged and have an adjustable distance; casting systems are arranged on the two mold frames, and each casting system comprises a toothed plate mounted on the machine body, a magnetic field generator mounted on the machine body, a casting frame capable of synchronously moving back and forth and left and right on the mold frames in a reciprocating manner, and a synchronous shaft capable of periodically and alternately rotating forwards and backwards. Technical breakthrough is achieved through the synergistic effect of the magnetic vibration coating and multi-mode vibration, Fe70Ga30 alloy nano-particles of the functional layer generate magnetic domain periodic orientation in an alternating magnetic field, micron-sized multi-axial vibration is excited, the surface of molding sand and a mold interface is deepened, intermolecular acting force is destroyed, deep-layer adhesive sand is stripped in a non-contact mode, and the surface of the mold is stripped in a non-contact mode. The problem that energy penetration of traditional impact type cleaning is insufficient is solved.

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 invention relates to the technical field of catalysts, in particular to a platinum-nickel alloy / carrier type catalyst and a preparation method and application thereof. The preparation method of the platinum-nickel alloy / carrier type catalyst comprises the following steps: mixing TiO2 with soluble Pt salt and soluble Ni salt, and carrying out hydrothermal reaction to induce alloy generation to obtain an alloy solution; and carrying out suction filtration on the alloy solution, drying and calcining to obtain the platinum-nickel alloy / carrier type catalyst. The prepared catalyst has the unique advantages that the particle size of the alloy nanoparticles is controlled to be 4-5 nm, the particle size is smaller than that of other catalysts, and more excellent performance is shown. The alloy nano-particles are uniform in dispersion and accurate in size, and show remarkable high efficiency in the aspects of activity, stability and selectivity of a target product.

The invention provides a hydrogen fuel cell catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts, the catalyst comprises an N atom modified carbon carrier and platinum alloy nanoparticles loaded on the surface of the carbon carrier, the platinum alloy nanoparticles are binary or multicomponent alloys formed by Pt and metal M, the molar ratio of platinum to the metal M is (0-10): 1, and the molar ratio of platinum to metal M is (0-10): 1. The weight ratio of the N atom modified carbon carrier to the platinum alloy nanoparticles is (25-80): (75-20). According to the preparation method of the hydrogen fuel cell catalyst, the N-modified carbon-supported PtFe alloy is prepared by a two-step pyrolysis method, so that the use amount of Pt is effectively reduced, the cost is controlled, and the utilization rate of Pt is increased; through the strong coordination capability of the 1, 10-phenanthroline, the formed Fe-N-C layer can restrain the growth and agglomeration of the PtFe alloy nanoparticles, the adsorption to a reaction intermediate is weakened, and the oxygen reduction activity and stability of the alloy catalyst are improved.

The invention provides a methane catalytic cracking hydrogen production catalyst and a preparation method thereof, the structural formula of the catalyst is x (Nia-Feb). YA.zB, the catalyst takes nickel-iron alloy nanoparticles as an active center, A is an auxiliary metal element, B is a carrier, x, y and z are the mole numbers of nickel-iron alloy, auxiliary metal and the carrier respectively, a and b are the mole numbers of Ni and Fe, x: z = 1: 1-10: 1, x: y = 5: 1-20: 1, and a: b = 1: 1-9: 1. The invention further provides a method for producing hydrogen through continuous methane cracking and generating a carbon nanomaterial, by adopting the catalyst for producing hydrogen through methane catalytic cracking, catalytic cracking at relatively low temperature and low pressure can be achieved, the method is simple in process (one-step method), high-energy-consumption steam is not needed, and energy consumption and production cost are greatly reduced; the hydrogen and the carbon nanomaterial can be generated by efficiently cracking methane, the methane conversion rate exceeds 60%, and the yield of the carbon nanomaterial exceeds 20 gc / gcat.

The embodiment of the invention discloses a bifunctional catalyst for direct synthesis and catalytic oxidation of hydrogen peroxide and a preparation method of the bifunctional catalyst. The catalyst with the dual functions is provided with Pd-based alloy nanoparticles and high-dispersion monatomic transition metal sites at the same time. The preparation method comprises the following steps: preparing a zeolite-like molecular sieve carrier taking transition metal as link ions through a rolling hydrothermal method; then loading gold and palladium metals on the zeolite-like molecular sieve carrier by adopting a low-temperature liquid phase reduction method to obtain a bifunctional catalyst; the bifunctional catalyst for direct synthesis of hydrogen peroxide and preparation of methanol through methane oxidation has high methane conversion rate, methanol selectivity and yield.

The invention provides a high-entropy intermetallic compound bifunctional catalyst as well as a preparation method and application thereof, and belongs to the technical field of energy materials. A wet chemical synthesis method and a controllable annealing process are combined to prepare the high-entropy intermetallic compound bifunctional catalyst, the catalyst comprises carbon-loaded platinum-cobalt-copper-tungsten-molybdenum five-element high-entropy alloy nanoparticles, the alloy nanoparticles have a high-entropy effect and an ordered structure at the same time, the particle size is 4-7 nm, and the particle size of the alloy nanoparticles is 4-7 nm. The molar ratio of metal atoms, namely platinum to cobalt to copper to tungsten to molybdenum, is 4: (1.75 to 2.5): (1.75 to 2.5): (0.01 to 0.5): (0.01 to 0.5). The platinum loading capacity in the catalyst is 20-70 wt%, the catalyst is used for oxygen reduction reaction catalysis of a cathode in a hydrogen fuel cell and / or methanol oxidation reaction catalysis of an anode in a direct methanol fuel cell, the half-wave potential in an acid medium exceeds a commercial Pt / C catalyst by 30 mV or above, and the methanol oxidation peak current density is 1.4-2.5 times that of the commercial Pt / C catalyst or a commercial PtRu / C catalyst.

The invention provides a carbon-loaded small-size spherical platinum-based alloy catalyst as well as a preparation method and application thereof, and belongs to the field of fuel cells. The carbon-loaded small-size spherical platinum-based alloy catalyst is synthesized by a one-step solvothermal reduction method. In the synthesis process of the platinum-copper alloy catalyst, the synthesis of spherical nanoparticles is realized by introducing gallium and gold and utilizing the induction effect of the gallium, and under the synergistic effect of the gallium and the gold, the agglomeration of platinum-based nanoparticles is inhibited, and the formation of small-size platinum-based alloy nanoparticles is realized; meanwhile, the introduction of gallium and gold leads to further decline of the d-band center of platinum, so that the electron structure of platinum is regulated and controlled to optimize the adsorption and desorption capability of platinum on the oxygen-containing intermediate. Under the combined action of size effect, morphology regulation and control and electronic structure optimization, the electro-catalytic oxygen reduction reaction performance of the catalyst is improved. The invention provides a method for regulating and controlling the size and morphology of the catalyst, and the catalyst is simple in preparation method and suitable for batch production and application.

The present invention provides a FeNiHo / carbon nanofiber composite absorber and a preparation method thereof, an absorbent material and a preparation method thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The present invention first mixes iron salt, nickel salt, holmium salt and polyvinyl pyrrolidone in a mixed solvent, and electrostatically spins the obtained spinning precursor solution to obtain a nanofiber membrane; the nanofiber membrane is sequentially subjected to pre-oxidation treatment and carbonization treatment to obtain a FeNiHo / carbon nanofiber composite absorber. The FeNiHo / carbon nanofiber composite absorber, paraffin and petroleum ether are mixed, and then pressed and irradiated with ultraviolet light to obtain an absorbing material. The FeNiHo alloy nanoparticles in the composite absorber improve the impedance matching performance and electromagnetic wave attenuation ability of the carbon nanofiber. The obtained absorbing material can achieve the purpose of real-time adjustment of the absorption frequency by irradiation with ultraviolet light.

A lithium metal anode protective film according to one specific embodiment includes lithium nitride (Li3N) nanoparticles, lithium-magnesium (Li-Mg) alloy nanoparticles, or a combination thereof. The lithium metal negative electrode protective film can effectively inhibit the growth of lithium dendrites in the battery charging / discharging process by inducing the uniform electro-deposition behavior and distribution of lithium ions.

The invention discloses a porous carbon catalyst embedded with high-density alloy nanoparticles as well as a preparation method and application of the porous carbon catalyst, and belongs to the technical field of fuel cells or water electrolysis catalytic materials. The porous carbon catalyst embedded with the high-density alloy nanoparticles is a nitrogen and oxygen co-doped carbon carrier which has a porous structure and is partially graphitized, the high-density and high-crystallinity alloy nanoparticles which are uniformly dispersed are embedded in the carbon carrier, and the particle size distribution is below 6nm. According to the porous carbon catalyst embedded with the high-density alloy nanoparticles, the dispersity and the utilization rate of the metal alloy nanoparticles are remarkably improved, and meanwhile, the conductivity and the stability of a carbon carrier are improved, so that the catalytic activity of the carbon carrier in an oxygen reduction reaction and an oxygen evolution reaction in an alkaline medium is effectively enhanced; the catalyst has very excellent bifunctional oxygen catalysis performance, and has a wide application prospect in the field of renewable energy source conversion and storage.

The invention discloses a high-efficiency hydrogen evolution catalytic material for carbon nanosheets loaded with RuCo alloy nanoparticles through in-situ growth on carbon nanofibers, which is characterized in that nanofibers prepared by an electrostatic spinning technology are used as a substrate, and ruthenium-doped ZIF-L nanosheets are grown on the nanofibers in situ by combining a soaking method; and after carbonization, RuCo alloy nanoparticles formed by high-temperature decomposition are uniformly dispersed on the ZIF-L derived carbon nanosheets. The catalytic performance of the prepared catalytic material is greatly improved, the usage amount of precious metal can be reduced, the production cost is reduced, meanwhile, excellent HER catalytic activity in alkaline electrolyte is achieved, and good stability and durability are achieved.

Herein is described a composite material, the composite material comprising composite 5 particles comprising particles of a mesoporous carbon support material having dispersed on their surfaces noble metal nanoparticles and / or noble metal-M alloy nanoparticles and optionally particles of the elemental metal M or metal oxide MOy, wherein y is >0 to a stoichiometric value of the metal oxide, wherein M is a less noble metal than the noble metal, wherein the composite particles have a BJH average pore diameter of from 2 to 0 50 nm and a particle size D90, as measured by laser diffraction and volume distribution, of 10 µm or less.

There is provided a photocatalyst for the direct synthesis of methanol from methane and carbon dioxide. The photocatalyst comprises an AuPd alloy nanoparticles dispersed on a support comprising GaN, InN, AlN, BN, TlN, GaP, InP or a combination thereof. The AuPd alloy nanoparticles are uniformly dispersed on the support such that at least 90% of the AuPd alloy nanoparticles are positioned at a distance of from 1 nm to 15 nm from other AuPd alloy nanoparticles. There is also provided a method of synthesizing methanol from methane and carbon dioxide with a photocatalyst comprising a transition metal dispersed on a support comprising GaN, InN, AlN, BN, TlN, GaP, InP or a combination thereof.

The invention discloses an electro-catalytic hydrogen evolution catalyst and preparation and application thereof, the catalyst comprises a porous carbon carrier loaded with metal elements capable of catalyzing electro-catalytic hydrogen evolution reaction, the porous carbon carrier contains hierarchical pore channels in which micropores, mesopores and macropores coexist, and the porous carbon carrier is doped with non-metal elements. The preparation method comprises the following steps: by taking heteroatom-doped graphene quantum dots (GQDs) as a carbon source and M / Zn-ZIF-8 as a metal source and a self-sacrifice template, adding Ru salt, and performing freeze drying to obtain a precursor; by regulating and controlling the mass ratio of GQDs, M / Zn-ZIF-8 and Ru salt in a precursor, a tightly connected mesoporous / macroporous structure is constructed, so that MRu alloy nanoparticles are uniformly distributed on a carbon wall with a cavity, the hierarchical pore MRu catalyst is formed, and the difficulty that a GQDs derivative catalyst only contains micropores is overcome. The catalyst has excellent mass transfer characteristic and high specific surface area, and the reaction activity of HER is remarkably improved.