185 results about "Alloy nanoparticle" patented technology

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 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 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 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 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.

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.

The invention discloses a positive electrode photocatalytic material for a solid-state battery, a preparation method of the positive electrode photocatalytic material, a battery positive electrode and the solid-state battery. The positive electrode photocatalytic material comprises a one-dimensional semiconductor nano array composite structure containing vacancies / defects, the one-dimensional semiconductor nano array composite structure comprises an oxide semiconductor nano array structure containing oxygen vacancies / defects or a sulfide semiconductor nano array structure containing sulfur vacancies / defects; the multi-element alloy nano-particles are binary alloy particles and / or high-entropy alloy particles with more than three elements, and the sizes of the binary alloy particles and / or the high-entropy alloy particles are in sub-nanometer and nanometer scale ranges; and the multi-element alloy nano particles are assembled on the one-dimensional semiconductor nano array composite structure. According to the invention, the photocatalytic characteristic of the low-dimensional semiconductor nano array structure is coupled with the plasmon effect of the multi-component alloy nano particles, so that the wide-spectrum strong absorption of sunlight and the efficient light-heat-electric energy synergistic conversion are realized.

The invention discloses a universal synthesis method of medium-entropy / high-entropy alloy nanoparticles and application of the medium-entropy / high-entropy alloy nanoparticles. Comprising the following steps: 1) dissolving three or more metal precursor salts in deionized water according to a required molar ratio, and carrying out ultrasonic treatment until the salts are completely dissolved to obtain a metal precursor solution A; (2) adding polyvinylpyrrolidone into the solution A as a stabilizer, and uniformly stirring; 3) under a stirring condition, slowly dropwise adding 0.3-0.5 M of a sodium borohydride solution as a reducing agent into the solution A to form a reaction solution B; (4) carrying out constant-temperature reaction on the reaction liquid B at 60-80 DEG C for 4-5 hours to form uniform nano-particle colloid; and (5) centrifuging, washing and freeze-drying the nano-particle colloid to obtain black powdery alloy nano-particles. The reaction temperature of the preparation method is 1t; 90 DEG C; the overpotential of the alloy nanoparticles in the HER is lt; 10mA / cm < 2 > at 30mV.

The invention belongs to the technical field of fuel cells, and particularly relates to a high-durability alloy catalyst and a preparation method and application thereof. The prepared high-durability alloy catalyst comprises a metal monatomic carrier Q-N-C and PtM alloy nanoparticles loaded on the metal monatomic carrier Q-N-C, the metal monatomic carrier Q-N-C is composed of a nitrogen-doped carbon carrier N-C and a metal monatomic Q loaded on the nitrogen-doped carbon carrier N-C, and the PtM alloy nanoparticles are composed of Pt salt and M metal salt; the related preparation method can effectively adjust the interaction between the carrier and the alloy, has high durability, and can solve the problem that the second phase metal in the alloy catalyst is easy to dissolve out by using the monatomic catalyst as the carrier of the catalyst and using the carrier as a receiver for receiving the dissolution of the second phase of the alloy catalyst. Meanwhile, excellent electrochemical performance and relatively high stability are realized.

The invention discloses a preparation method of a copper-palladium alloy loaded nano titanium dioxide semiconductor material as a catalyst for a carbon dioxide reduction reaction. Firstly, alloy nanoparticles are generated through a sol-gel method, the morphology of the nanoparticles is controlled and agglomeration is prevented through oleylamine and oleic acid, and borane-tert-butylamine is added at the temperature of 170 DEG C to regulate and control the sizes of the generated alloy nanoparticles. A series of characterizations prove that the catalyst has a very good particle loading condition, uniform particle distribution and increased reaction active sites, and shows excellent activity when being applied to a carbon dioxide reduction reaction, when the loading capacities of copper and palladium are respectively 1%, the activity of the obtained catalyst is the highest, the methane generation rate can reach 20.23 mol / g / h, and the methane generation rate can reach 20.23 mol / g / h. The selectivity of methane reaches 100%.

Low-cost and earth abundant, Ni1-xMox alloy nanocrystals, with sizes ranging from 18-43 nm and varying Mo composition (0.0-11.4%), were produced by a colloidal chemistry method for alkaline HER reactions. For a water splitting current density of −10 mA / cm2, these alloys demonstrate over-potentials of −62 to −177 mV, which are comparable to commercial Pt-based electrocatalysts (−68 to −129 mV). The cubic Ni0.934Mo0.066 alloy nanocrystals exhibit the highest activity as alkaline HER electrocatalysts, outperforming commercial Pt / C (20 wt %) catalyst.

The invention relates to a carbon-supported noble metal ordered alloy electrocatalyst capable of realizing mass production. The electrocatalyst comprises a carbon carrier and small-size noble metal ordered alloy nanoparticles loaded on the carrier, the loading capacity of the alloy is 20 to 90 weight percent; the average particle size of the precious metal ordered alloy nanoparticles is 1-10 nm; the noble metal ordered alloy comprises an alloy consisting of a noble metal and at least one different transition metal M; wherein the noble metal is platinum, palladium, iridium, rhodium or ruthenium. The method is used for solving the problem that the size of catalyst particles becomes large in the high-temperature ordering process, high metal loading capacity is achieved, the feed ratio is increased to 60 times, successful synthesis of the catalyst can be achieved on the gram scale level, and the method can be popularized to actual production to achieve large-scale production.

The invention relates to a preparation method and application of a CoNi alloy nanoparticle doped double-shell hollow carbon material, and belongs to the field of nano material preparation technology and electromagnetic wave absorption application. 3-aminophenol and formaldehyde are subjected to a condensation polymerization reaction to synthesize phenolic resin balls, the phenolic resin balls are placed in 3-aminophenol and formaldehyde again to react, and the double-shell hollow phenolic structure is obtained. And adding the double-shell hollow phenolic aldehyde structure into cobalt nitrate hexahydrate (Co (NO3) 2.6 H2O) and 2-methylimidazole for low-temperature reaction, then adding a solution of (Ni (NO3) 2.6 H2O) for reaction at high temperature and high pressure, and drying to obtain the CoNi alloy nanoparticle doped double-shell hollow carbon material. According to the preparation method disclosed by the invention, the double-shell structure is taken as a main template, and the CoNi alloy nanoparticles are used as active components to be doped in the double-shell hollow structure in situ, so that the cascade synthesis of the microstructure of the nano material is greatly enriched, and the obtained CoNi alloy nanoparticle doped double-shell hollow carbon material has excellent electromagnetic wave absorption performance.

The invention relates to the technical field of catalytic materials, in particular to a monatomic alloy catalyst and a preparation method and application thereof.The preparation method comprises the steps that a first solution obtained by mixing cobalt salt, silver salt and a solvent is mixed with a second solution obtained by mixing 2-methylimidazole and a solvent, stirring treatment is conducted, and a first precursor solution is obtained; and carrying out first heat treatment on the obtained precipitate in an inert atmosphere to obtain the fcc Ag1Co / C monatomic alloy catalyst. A first solution and a second solution are mixed to obtain an Ag / ZIF-67 precipitate which is a Co-based zeolite imidazate framework structure composite material, an organic framework of the Co-based zeolite imidazate framework structure composite material is decomposed and carbonized through high-temperature heat treatment, meanwhile, Ag and Co species are reduced and converted into nanoparticles, and the Ag / ZIF-67 precipitate is obtained. And finally, the composite material catalyst with the Ag1Co monatomic alloy nanoparticles embedded into the nitrogen-doped carbon matrix is formed. The catalyst shows the most excellent activity and selectivity, the removal rate of 4-NP reaches 100% within 6 min, and high catalytic activity can be achieved.

The invention discloses a preparation method of a high-resilience expanded polytetrafluoroethylene sealing material, and belongs to the technical field of high polymer material modification. According to the method, high-molecular-weight or modified polytetrafluoroethylene is used as a matrix, and high-orientation fibers are obtained through ultrasonic premixing, twin-screw melt extrusion, stretching and heat setting; dipping the fiber in a dispersion liquid containing high-entropy alloy nanoparticles, carbon nanotubes and graphene nanosheets, carrying out vacuum drying and gradient heat treatment to form a nano-reinforced precursor fiber, and constructing a porous anisotropic skeleton by adopting conventional or supercritical expansion and a specific weaving process; and interface strengthening and surface functionalization are realized through plasma surface treatment, silane coupling agent chemical grafting and wear-resistant coating coating. The obtained sealing material has low density, high strength, high resilience and low compression set, has excellent chemical medium resistance and anti-static performance, and is suitable for sealing parts of flanges, valves and the like under harsh working conditions of petrochemical engineering, electric power, hydrogen energy, aerospace and the like.

The application belongs to the technical field of carbon material preparation, and particularly relates to a waste fiber-based three-dimensional flexible functional carbon felt and a preparation method thereof. The carbon felt is made of waste textiles through steps of opening, mixing, three-dimensional needling, pre-oxidation, carbonization and surface modification. The application discloses that waste textiles are used as raw materials, a micron-level fiber network is constructed through three-dimensional needling technology, high-entropy alloy nanoparticles are synthesized on the surface of the carbonized fiber, and carbon nanotubes are grown, so that a unique multi-scale micro-nano interpenetrating network structure is formed. The structure not only improves the specific surface area and conductivity of the material, but also endows the material with excellent flexibility and mechanical properties. In addition, the preparation method realizes high-value utilization of the waste textiles, and has significant environmental and economic benefits. The material has wide application prospects in the fields of flexible electrodes, energy storage, electrochemical sensing and the like.

The invention provides a six-element high-entropy alloy nanoparticle composite carbon fiber material and a preparation method thereof, and belongs to the technical field of lithium battery negative electrode materials. The preparation method comprises the following steps: dissolving metal salts of any six elements of target metal elements including Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Tc, Hf, Ta, W, Re and Mg as precursors to obtain a precursor solution; then, immersing a carbon fiber material into the precursor solution, wetting and drying to obtain a precursor-carbon fiber material; and finally, sintering the precursor-carbon fiber material by adopting a thermodynamic driving phase transformation method to obtain the six-element high-entropy alloy nanoparticle composite carbon fiber material, which improves the initial coulombic efficiency (ICE = 99.94%) of the lithium battery negative electrode material, effectively inhibits the growth of lithium dendrites, relieves the volume expansion and accumulated mechanical stress in the reaction process, and improves the performance of the lithium battery negative electrode material. Therefore, the integrity of the electrode is maintained, a stable SEI film is constructed, and the cycling stability of the battery is improved.

According to the preparation method, a proper amount of transition metal is introduced, the transition metal can be combined with precious metal, the use of the precious metal can be obviously reduced, synergistic interaction is achieved, the catalytic activity is improved, in addition, the ultrasonic-assisted cavitation effect is introduced, and polyhydric alcohol serves as a solvent and a reducing agent, so that the catalytic activity of the catalyst is improved. Under the synergistic effect of the stabilizer and the adjusting aid, agglomeration of nanoparticles can be effectively prevented, uniform reduction and nucleation of metal ions are greatly promoted, noble metal atoms and transition metal atoms are co-reduced to form atomic-scale dispersed alloy nano crystal nucleuses, and alloy nanoparticles with small and uniform particle sizes are formed; compared with the prior art, more specific surfaces can expose more active sites, the utilization rate of noble metal atoms can be increased, finally, after acid etching, a core-shell structure is formed through temperature programming reduction, the catalyst has better stability, the catalyst can still keep extremely high activity and stability after long-term operation, and the service life is remarkably prolonged.

The invention discloses a gold-silver alloy nanoparticle interface modified copper-zinc-tin-sulfur-selenium film, a preparation method thereof and a solar cell, and belongs to the technical field of photoelectric material new energy. Gold-silver alloy nanoparticles are uniformly distributed on the surface of the copper-zinc-tin-sulfur-selenium film. According to the invention, interface modification is carried out on the CZTSSe film by using the gold-silver alloy nanoparticles, so that the light absorption performance, Raman scattering performance and the like of the CZTSSe film are effectively improved, and then the performance of collection efficiency, open-circuit voltage, short-circuit current density, filling factors and the like of the solar cell is improved by applying the interface-modified CZTSSe to the solar cell. Therefore, the solar cell has more excellent use performance.

The invention discloses a hollow multilayer heterostructure catalyst for photo-thermal deoxidation of fatty acid and a preparation method. The inner layer of the catalyst is alloy nanoparticles of one or more of Ru, Pd, Au, Pt, Rh, Cu, Ni, Co and Ag, and the outer layer of the catalyst is a heterojunction formed by a metal organic framework material and one or two of TiO2 and C3N4. Metal or alloy is coated in a metal organic framework material, and then one or two of TiO2 and C3N4 are loaded on the outer surface of the metal organic framework material in a self-assembly or impregnation loading mode. The prepared catalyst is high in catalytic efficiency, capable of achieving efficient photo-thermal deoxidation of fatty acid to prepare alkane components, high in stability and wide in application range.

The present disclosure relates to a method and system for producing multimetal alloy nanoparticles (MMA NPs), such as high-entropy alloy nanoparticles (HEA NPs). The method includes the steps of introducing a metal source containing multiple metals into a heat zone of a plasma torch to obtain a metal vapor containing multiple metals; substantially homogenizing the metal vapor by plasma expansion and turbulence; cooling the metal vapor to co-nucleate and co-condense MMA NPs; and collecting the MMA NPs. The system includes a reaction chamber configured to substantially homogenize the metal vapor by generating either plasma expansion or turbulence, or both; a plasma torch; a reactor including an inlet for introducing the multimetal source into the plasma torch and configured to cool the metal vapor to co-nucleate and co-condense MMA NPs; and a collector.

The invention provides a difunctional electrocatalyst prepared by using Joule heat and a preparation method and application thereof, and belongs to the technical field of new energy materials. The preparation method comprises the following steps: synthesizing an organic framework compound by adopting dimethyl imidazole, zinc nitrate and transition metal salt of cobalt (Co), then pyrolyzing to prepare a cobalt-nitrogen-doped carbon material with oxygen reduction (ORR) activity, mixing the cobalt-nitrogen-doped carbon material with a nickel compound and an iron compound respectively, and preparing the cobalt-nitrogen-doped carbon material. Nickel and iron compounds are reduced into alloy nanoparticles in an extremely short time by using Joule heat, and the alloy nanoparticles are directly loaded on the surface of a cobalt-nitrogen-doped carbon material to obtain a high-performance dual-function (ORR and OER) electrocatalyst which can be used as a cathode catalyst to be applied to a metal-air battery.

The invention discloses a preparation method and application of an AgCo / NiTiO3 ammonia borane alcoholysis hydrogen production catalyst with photocatalytic activity. NiTiO3 microrods are synthesized through a sol-gel method, then metal silver salt and cobalt salt are reduced into alloy through an ethylene glycol reduction method, the alloy is deposited on the surfaces of the NiTiO3 microrods, and the AgCo / NiTiO3 ammonia borane alcoholysis hydrogen production catalyst is obtained. The obtained sample has photocatalytic activity in the alcoholysis reaction of ammonia borane, and under the irradiation of visible light, the performance of catalyzing the alcoholysis of ammonia borane to produce hydrogen is remarkably improved. In addition, in the synthesis process, the silver-cobalt ratio can be regulated and controlled to further optimize the components of the catalyst; the whole preparation process is simple to operate, environment-friendly, good in experimental reproducibility, low in cost and easy for industrial production.

The application discloses a MOFs-derived high-entropy alloy / carbon composite wave-absorbing material, which has a structure of a plurality of connected cluster structures; the cluster structures are composed of a plurality of connected porous hollow spherical structures; the porous hollow spherical structures are formed by accumulation of nanometer spherical particles; and the nanometer spherical particles are composed of amorphous carbon and FeCoNiCuCr high-entropy alloy nanoparticles uniformly distributed therein. The application also provides a preparation method of the MOFs-derived high-entropy alloy / carbon composite wave-absorbing material. Through component design of a MOFs precursor and carbonization process regulation, the high-entropy alloy is uniformly distributed in the carbon skeleton of the MOFs derivative, the skin effect caused by large-particle magnetic particles is effectively avoided, the electromagnetic wave loss capacity is improved, and the wave-absorbing performance is effectively improved. Meanwhile, the prepared wave-absorbing material has relatively small density, and the preparation process is simple.

The invention relates to a preparation method of a ruthenium-based acidic water electrolysis hydrogen production catalyst, and belongs to the technical field of clean renewable energy nanometer materials and catalysis. The method is characterized in that a carbon carrier and a metal compound are adopted as precursors, a polyol reduction method is adopted, carbon-loaded ruthenium-based alloy nanoparticles are obtained, and then the ruthenium-based catalyst is prepared through low-temperature pyrolysis under the air condition. The ruthenium-based catalyst nanoparticles are uniform in size, compared with a conventionally adopted hydrothermal method, the method is simple in step, controllable in morphology and uniform in size distribution, and meanwhile, the prepared material has high catalytic activity and stability and can be applied to cathode and anode catalyst materials of a proton exchange membrane water electrolysis device.

The application belongs to the technical field of catalyst preparation, and relates to a preparation method and application of a CoCuNiPtRu high-entropy alloy nanoparticle catalyst. A one-pot wet chemical method is used to uniformly mix 4-amino pyridine solvent and metal precursors, and then ascorbic acid is quickly added for reduction in an oil bath at 95 DEG C. After reaction, washing and drying, the catalyst is obtained. The method has the advantages of simple process and convenient operation. The obtained catalyst has high activity and selectivity in catalytic degradation of polylactic acid waste plastics under alkaline conditions, can efficiently upgrade and convert the polylactic acid waste plastics into acetic acid, provides a new way for resource utilization of waste plastics, and has good environmental protection and resource recycling prospects.

This invention provides a hydrogen sensor based on nanoparticles, its preparation method, and its application, belonging to the field of hydrogen sensor technology. The nanoparticle-based hydrogen sensor provided by this invention includes a substrate and at least one pair of electrodes spaced apart on the surface of the substrate. The substrate surface between the electrodes is covered with nanoparticles, and the electrode surfaces and nanoparticle surfaces are covered with a thin film layer. The nanoparticles include one or more of palladium nanoparticles, platinum nanoparticles, and alloy nanoparticles, wherein the alloy nanoparticles contain palladium and / or platinum. The material of the thin film layer includes one or more of polymethyl methacrylate, naphthol, silica, alumina, polytetrafluoroethylene, diamond-like carbon film, silicon nitride, and silicon carbide. The nanoparticle-based hydrogen sensor provided by this invention has high sensitivity and excellent stability, enabling rapid and accurate determination of hydrogen in an air environment.