146 results about "Platinum salts" patented technology

The invention provides a platinum-carbon catalyst taking hollow carbon nanospheres as a carrier and a preparation method of the platinum-carbon catalyst. The method comprises the following steps: adding a polymer monomer into a nano template dispersion liquid with a uniform size; then adding a proper amount of platinum salt into the solution to obtain a mixed solution, and stirring to react for 0.5-30 hours to obtain a reaction product; and annealing the reaction product, and then removing the nano template to obtain the platinum-carbon catalyst. The obtained platinum-carbon catalyst takes the hollow carbon nanospheres as a carrier and has a larger specific surface area, the platinum catalyst is loaded on the surfaces of the carbon nanospheres and can be in better contact with an electrolyte, and the obtained catalyst has good electrochemical activity and shows excellent electro-catalytic hydrogen evolution performance and oxygen reduction performance; and the related preparation method is simple and reliable, is suitable for preparation of an electrocatalytic hydrogen evolution electrode and an oxygen reduction electrode, and has a good application prospect in the fields of proton exchange membrane electrolytic cells, hydrogen fuel cells and the like.

The invention relates to the technical field of catalysts, in particular to a carbon monoxide oxidation catalyst and a preparation method thereof. The catalyst is prepared by the method. The method comprises the following steps: adding a required amount of platinum salt and assistant salt into water for dissolving to obtain a mixed solution; dropwise adding the mixed solution into a required amount of tungsten-titanium powder, and stirring while dropwise adding until a muddy substance is obtained; adding a binder into the mud, uniformly stirring and mixing, and extruding to obtain an integral honeycomb mud blank; sequentially carrying out first drying treatment and first roasting treatment on the integral honeycomb mud blank to obtain an integral honeycomb carrier; placing the integral honeycomb carrier in a tetrabutyl titanate alcoholic solution for soaking treatment; and sequentially carrying out second drying treatment and second roasting treatment on the soaked integral honeycomb carrier to obtain the carbon monoxide oxidation catalyst. According to the invention, the carbon monoxide oxidation catalyst with high catalytic activity, strong toxicity resistance and good stability can be prepared.

The application discloses a platinum-based high-entropy intermetallic compound and a preparation method and application thereof as a hydrogen fuel cell cathode catalyst, and belongs to the field of fuel cells.The preparation method comprises the following steps: S01, adding platinum salt, at least five other metal salts and a nitrogen-rich organic compound into an organic solvent, uniformly mixing, and obtaining a metal precursor mixed solution; S02, adding a carbon carrier into the metal precursor mixed solution, fully mixing, drying, collecting, and obtaining a precursor; and S03, heat treating the dried precursor under a reducing atmosphere, and performing heat preservation treatment, so as to obtain the platinum-based high-entropy intermetallic compound.The preparation method is simple, low in cost and good in repeatability, the prepared catalyst has the advantages of uniform particle size and high oxygen reduction activity, and has a good development prospect in the field of hydrogen fuel cell catalyst applications.

The present invention discloses a platinum electroplating solution, a preparation method thereof and an application in semiconductors, which comprises the following raw materials: 0.5-10 g / L of platinum salt PEP, 15-35 g / L of ethylenediamine sulfate, 5.0-29 g / L of malonic acid, 5.0-40 g / L of ammonium acetate, the balance being ultrapure water and ammonia water; the pH value of the platinum electroplating solution is adjusted to 7.0 with ammonia water; the method for preparing the coating comprises the following steps: S1, degreasing and pickling the semiconductor device to be processed; S2, selecting corresponding electroplating conditions and configuring a corresponding anode and its anode mask; S3, performing electroplating; S4, automatically adding the platinum salt PEP solution in a linked manner; S5, adjusting the pH value of the platinum electroplating solution; S6, stopping electroplating after reaching the target coating thickness or the preset electroplating time. The platinum metal film formed by the present invention has excellent morphology, uniform distribution, high wear resistance and excellent compactness.

The invention discloses a superfine nano platinum black catalyst with a three-dimensional self-supporting structure and a preparation method and application thereof, and relates to the technical field of catalysts.The preparation method comprises the following steps that platinum salt is dissolved in water, and a first solution is obtained; adding a water-soluble inorganic polymerization inhibitor into the first solution, and stirring and mixing at a first temperature to obtain a second solution; adding an alkaline solution into the second solution, and stirring and mixing at a second temperature to obtain a third solution; drying the third solution to obtain precursor powder; placing the precursor powder in a reducing atmosphere, and carrying out heat treatment at a third temperature to obtain a catalyst semi-finished product; soaking, dispersing, washing and drying the obtained catalyst semi-finished product in a small molecular alcohol water solution to obtain the platinum black catalyst, and interweaving platinum nanowires of the platinum black catalyst to form a three-dimensional network with a porous structure and a large specific surface area. The catalyst shows excellent catalytic activity, durability and mass transfer performance.

The invention discloses an electrolytic solution of a platinum-rhodium alloy, a preparation method and a preparation method of a plating layer of the platinum-rhodium alloy, and belongs to the technical field of precise electroplating. The electrolytic solution comprises a platinum salt, a rhodium salt, a first additive, a second additive, a first complexing agent, a second complexing agent, a first stabilizer and a second stabilizer, the first additive is a sulfamic acid compound containing 3-4 hydroxyalkyl groups, the second additive is sulfamic acid salt containing 3-4 hydroxyalkyl groups, and the first complexing agent and the second complexing agent are a platinum salt and a rhodium salt. The first complexing agent is a mixture of dicarboxylic acid and dicarboxylic acid containing amino or hydroxyl, the second complexing agent is a salt corresponding to the dicarboxylic acid, and the first stabilizer is a mixture of alkyl sulfonic acid and alkyl sulfonate. Through the synergistic effect of the additive, the complexing agent and the stabilizer, the additive, the complexing agent and the stabilizer form a five-membered to seven-membered heterocyclic coupling structure with platinum ions and rhodium ions, and the stability of the electrolytic solution is remarkably improved. And the obtained platinum-rhodium alloy coating is compact and uniform, and has excellent nitric acid steam and mixed gas corrosion resistance.

The invention discloses a platinum chemical plating solution and a preparation method and application thereof in semiconductors, the platinum chemical plating solution comprises the following raw materials: 0.5-10.0 g / L of platinum salt PEP, 2.1-10.0 g / L of ethylenediamine sulfate, 1.2-8.9 g / L of malonic acid, 5-50 g / L of ammonium acetate, 1.2-9.2 g / L of thiourea dioxide, and the balance of ultrapure water and ammonia water; and the pH value of the solution is adjusted to 7.0 by ammonia water. The platinum chemical plating solution disclosed by the invention is suitable for nano precision manufacturing and processing on the surface of an electronic element product of a semiconductor device, and a formed platinum metal film has excellent uniform distribution, compactness and high wear resistance; a semiconductor electronic component product with excellent plugging performance, corrosion resistance, high-precision conductivity and high-quality electronic signal transmission performance is obtained.

The invention discloses a preparation method of platinum-based multi-metal aerogel and application of the platinum-based multi-metal aerogel in an electro-catalysis hydrogen evolution reaction. The method comprises the following steps: firstly, sequentially adding platinum salt and other metal salts into pure water, uniformly mixing, then adding a sodium borohydride solution, uniformly mixing, quickly freezing the reaction solution with liquid nitrogen, melting to obtain wet gel, and then washing and drying the wet gel to obtain the aerogel. The obtained metal aerogel is applied to a hydrogen evolution electrocatalyst and shows excellent catalytic activity under an alkaline condition. The preparation method has the advantages that the synthesis process is simple, convenient and efficient, regulation and optimization of an electronic structure can be realized through interaction among multiple metals, so that the catalytic performance is improved, the porous structure of the aerogel effectively provides a high-speed mass transfer channel, the catalytic activity is improved, and the preparation method is suitable for industrial production. And a solid foundation is laid for wide application of the metal aerogel material in the field of industrial chemical engineering.

The invention provides a catalyst for preparing small-diameter single-walled carbon nanotubes and a preparation method thereof.The preparation method of the catalyst comprises the steps that soluble ferric salt, soluble platinum salt and auxiliaries are weighed, mixed and dissolved in water, the mixture is stirred to be uniform, and a solution A is obtained; adding a pretreated carrier into the solution A, uniformly stirring, continuing to heat and evaporate to dryness, and grinding to obtain a solid B; finally, the solid B is subjected to in-situ reduction with hydrogen at 500 DEG C for 1 h and then purged with nitrogen, and the catalyst for preparing the small-pipe-diameter single-wall carbon nanotube is obtained. The Fe-Pt alloy is used as a catalyst, Fe is used as a main active metal, and carbon source cracking and carbon tube nucleation are driven; the synergistic effect of Fe-Pt can improve the carbon deposition resistance of the catalyst, prolong the service life of the catalyst, further effectively reduce the pipe diameter of the SWCNTs and significantly improve the overall quality of the SWCNTs.

The invention discloses an ammonia nitrogen electrochemical sensitive electrode based on a platinum-zinc-copper ternary alloy and a preparation method thereof, and belongs to the technical field of electrochemical sensing. The preparation method comprises the following steps: firstly, dissolving platinum salt, copper salt and zinc salt in deionized water according to a certain proportion to prepare a precursor solution for electrodeposition; and then, constructing a three-electrode system by taking the cleaned carbon cloth substrate as a working electrode, a platinum sheet as a counter electrode and Ag / AgCl as a reference electrode, and depositing a platinum-zinc-copper ternary nano-alloy sensitive material on the carbon cloth substrate through an electrochemical cyclic voltammetry to obtain the ammonia nitrogen electrochemical sensitive electrode based on the platinum-zinc-copper ternary alloy. Finally, the electrode is used for sensitive detection of ammonia nitrogen in water. The detection performance of the platinum-zinc-copper ternary alloy electrode on ammonia nitrogen is superior to that of a sensitive electrode of the same type, and the platinum-zinc-copper ternary alloy electrode has the advantages of low cost, high sensitivity, wide linear range, low detection limit and the like, shows good repeatability and interference resistance, and can realize rapid detection and real-time monitoring on ammonia nitrogen in water.

The invention discloses a preparation method and application of a boron nitride confined platinum single atom-platinum cluster double-site catalyst. The preparation method comprises the following steps: mixing urea, boric acid and carbon nanotubes, and grinding; the ground mixture is placed in an ammonia-argon mixed atmosphere environment for first pyrolysis, and powder is obtained; adding the powder into a boric acid solution, heating and stirring to obtain a defect-rich boron nitride carrier; and washing and drying the carrier, immersing the carrier in a platinum salt aqueous solution, carrying out ultrasonic dispersion, carrying out a vacuum freeze drying method, and finally carrying out second pyrolysis on the dried sample in an ammonia-argon mixed atmosphere to obtain the platinum single atom-platinum cluster composite structure (PtSA-C (at) eBN-CNT) material. The material can efficiently and synergistically catalyze an electrochemical hydrogen evolution reaction (HER) under an alkaline condition (1M KOH), can be applied to a membrane electrode electrochemical cell as a cathode catalyst, shows excellent catalytic activity and stability under working conditions, and has good industrial application potential.

The invention belongs to the technical field of functional metal cluster preparation, and particularly relates to a platinum cluster with nano-enzyme and visible light catalysis functions and a preparation method and application thereof. The platinum cluster takes 6-aza-2-thiothymine as a ligand and platinum salt as a precursor, arginine is added to modify the ligand, and the platinum cluster is synthesized through a hydrothermal method. The platinum cluster is suitable for an environment with a pH value of 3-7.4. The platinum cluster disclosed by the invention has relatively high peroxidase activity and visible light catalytic activity.

The invention relates to the technical field of catalyst preparation, in particular to a neodymium-doped titanium dioxide loaded platinum nanoparticle composite catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving an organic titanium salt and a soluble neodymium salt in ethanol to obtain a mixed solution; mixing the ethanol dispersion liquid of the SiO2 spheres, the mixed solution and ammonia water, and carrying out hydrothermal reaction to obtain Nd-SiO2 (at) TiO2 core-shell spheres; etching SiO2 in the Nd-SiO2 (at) TiO2 core-shell sphere by adopting a sodium hydroxide solution to obtain a neodymium-doped titanium dioxide hollow sphere; and dropwise adding a sodium borohydride solution into an aqueous solution of the neodymium-doped titanium dioxide hollow spheres and a soluble platinum salt, and carrying out a reduction reaction to obtain the neodymium-doped titanium dioxide loaded platinum nanoparticle composite catalyst. The preparation method provided by the invention not only improves the photocatalytic efficiency and electro-catalytic reaction activity of the neodymium-doped titanium dioxide loaded platinum nanoparticle composite catalyst, but also enhances the long-term stability and durability of the neodymium-doped titanium dioxide loaded platinum nanoparticle composite catalyst.

The invention discloses an 8-hydroxyl dictamnine platinum complex with high activity in vitro and vivo as well as a synthesis method and application thereof. According to the invention, 8-hydroxy dictamnine is used as an active ligand and reacts with cis-Pt (DMSO) 2Cl2 platinum salt to synthesize the 8-hydroxy dictamnine platinum complex. The 8-hydroxyl dictamnine platinum complex can inhibit the growth of human ovarian adenocarcinoma cis-platinum drug-resistant cells SK-OV-3 / DDP in a targeted manner, shows excellent anti-tumor activity, has potential medicinal value, and is expected to be used for preparing various anti-tumor drugs.

The invention relates to a preparation method of supported porous carbon for catalyzing hydrosilylation reaction, which comprises the following steps: (S1) mixing thermoplastic phenolic resin, polyindole boric acid and a stabilizer, and heating to react to obtain modified phenolic resin; the mass ratio of the thermoplastic phenolic resin to the polyindole boric acid is 100: (15-25); (S2) dissolving the modified phenolic resin, a pore-foaming agent and a curing agent in a solvent, removing the solvent, and crushing to obtain solid particles; (S3) carrying out thermocuring, pre-oxidation, carbonization, activation and oxidation treatment on the solid particles in sequence to obtain oxidized porous carbon; (S4) modifying the oxidized porous carbon with vinyl siloxane to obtain vinyl siloxane modified porous carbon; and (S5) dipping the vinyl siloxane modified porous carbon in an alcoholic solution of platinum salt to obtain the supported porous carbon. The supported porous carbon prepared by the invention has excellent catalytic efficiency and good stability when being used for catalyzing hydrosilylation reaction, and can be recycled.

The invention relates to a catalyst for oxidative removal of CO in low-temperature high-sulfur sintering flue gas of steel, the catalyst takes four mixed oxides of Al2O3, SiO2, TiO2 and ZrO2 as a carrier, Pt atoms dispersed in a monatomic layer as an active component and La2O3, CeO2, SnO2 and Nb2O5 as active auxiliaries, the four oxides are firstly mixed and roasted in the preparation process to obtain a catalyst carrier, and the catalyst carrier is added into the catalyst for oxidation removal of CO in the low-temperature high-sulfur sintering flue gas of the steel, so that the catalyst can be used for oxidation removal of CO in the low-temperature high-sulfur sintering flue gas of the steel. Then fully mixing the active auxiliary agent and the catalyst carrier, carrying out microwave heating to obtain catalyst pug, finally spraying a platinum salt solution to the surface of the catalyst pug in the form of steam to obtain a monatomic Pt-loaded catalyst pug precursor, and molding to obtain the catalyst. The catalyst prepared by the invention has good CO oxidation catalytic activity and poisoning resistance in steel sintering flue gas at 120-200 DEG C.

The invention provides a preparation method of a low-load RuPdPt ternary noble metal electrocatalyst. The preparation method comprises the following steps: etching foamed nickel in a hydrochloric acid solution, and soaking the etched foamed nickel in a mixed solution containing ferric chloride, copper chloride and sodium chloride for 3-12 hours to obtain a NixFeyCuzOOH substrate; ruthenium salt, platinum salt and palladium salt are mixed and then ground, water is added to prepare a mixed solution, then an alcoholic solution of dimethylglyoxime disodium salt octahydrate is added, and a precious metal mixed solution is formed after ultrasonic dispersion; the preparation method comprises the following steps: soaking a NixFeyCuzOOH substrate in a noble metal mixed solution, soaking for 1-6 hours under stirring and heating conditions, washing an obtained product with water, and drying to obtain the RuPdPt-NixFeyCuzOOH composite catalyst. According to the invention, the noble metals Ru, Pd and Pt are combined with the substrate NixFeyCuzOOH nanosheets through M1-M2-O bonds, so that monatomic-cluster sites of the noble metals Ru, Pd and Pt are effectively anchored, and the stability of the catalyst at high current density is greatly improved.

The application discloses a supported PtNi b-site adiponitrile hydrogenation catalyst and a preparation method and application thereof, and belongs to the technical field of thermal catalysis. The preparation method comprises the following steps: (1) dispersing ammonium tungsten oxide pentahydrate in water, adding an acidic solution, condensing and refluxing, heating and reacting, centrifugal filtering and drying the precipitate to prepare tungsten oxide nanorod carriers; (2) dispersing the tungsten oxide nanorod carriers in a solvent, adding a platinum salt solution, stirring, evaporating the solvent, and calcining the solid to prepare a catalyst precursor; and (3) dispersing the catalyst precursor in a solvent, adding a nickel salt solution, stirring, evaporating the solvent, and calcining the solid to prepare the catalyst. The application introduces Pt and Ni on the reducible WO3 carrier to construct a bimetallic active site catalyst, and the bimetallic active site catalyst can catalyze the reaction of adiponitrile hydrogenation to prepare primary amine under mild conditions, has the characteristics of low noble metal loading, high activity and high selectivity, and has important industrial application value.

The application relates to the technical field of graphene, in particular to platinum-loaded nitrogen-doped graphene as well as a preparation method and application thereof. The preparation method of the platinum-loaded nitrogen-doped graphene comprises the following steps: mixing graphene oxide, a platinum salt and a solvent to form a mixed solution, and then performing a hydrothermal reaction to prepare graphene oxide-platinum salt composite powder; mixing the graphene oxide-platinum salt composite powder with an amino compound, and performing ball milling to prepare amino-modified graphene oxide-platinum salt composite powder; and performing microwave irradiation on the amino-modified graphene oxide-platinum salt composite powder to prepare platinum-loaded nitrogen-doped graphene. The preparation process is simple, and the prepared platinum-loaded nitrogen-doped graphene has good oxygen reduction catalytic activity.

This invention discloses a method for preparing a Pt / C catalyst by vacuum impregnation with an ionic liquid and its application. First, a carbon support is mixed with water and alcohol, ball-milled, and then mixed with nitric acid to obtain an acid-treated carbon support. Next, a precursor solution is prepared by mixing a platinum salt, an organic solvent, a surfactant, and water, and then an imidazole ionic liquid is added to it in portions to obtain a precursor solution containing the ionic liquid. This solution is mixed with the acid-treated carbon support and vacuum ball-milled to obtain a mixed slurry. This slurry is then vacuum freeze-dried to obtain a freeze-dried powder. Reduction and heat treatment are then performed to obtain the ionic liquid-doped Pt / C catalyst. The catalyst is then coated onto both sides of a proton exchange membrane to form a catalytic layer. Through this method, this invention not only effectively inhibits the aggregation, migration, and ripening of platinum particles during electrochemical processes, thereby significantly improving the catalyst's durability, but also enhances the catalyst's proton conductivity under low humidity conditions.

The invention relates to a fuel cell catalyst and a preparation method thereof, and belongs to the technical field of fuel cells. The preparation method of the fuel cell catalyst provided by the invention comprises the following steps: (1) performing heat treatment on conductive carbon black to obtain graphitized conductive carbon black; (2) mixing ammonium iodide with the graphitized conductive carbon black obtained in the step (1) to obtain mixed powder, and calcining the obtained mixed powder to obtain an iodine-doped carrier; and (3) dipping the iodine-doped carrier obtained in the step (2) in a platinum salt solution, drying, and carrying out heat treatment in a reducing atmosphere to obtain the fuel cell catalyst. According to the preparation method, ammonium iodide easy to sublimate and conductive carbon black subjected to graphitization heat treatment are uniformly mixed, the ammonium iodide sublimates to the surface of the graphitized conductive carbon black in the heat treatment process to realize in-situ doping, an iodine-doped voltage-resistant carrier is formed, and then Pt is loaded on the iodine-doped voltage-resistant carrier, so that the Pt-loaded iodine-doped voltage-resistant composite material is obtained. The fuel cell catalyst with high stability and excellent electrochemical performance is obtained.

The invention discloses a dysprosium-doped platinum-based catalyst and a preparation method and application thereof, and belongs to the technical field of battery materials.The preparation method of the dysprosium-doped platinum-based catalyst comprises the following steps that a dysprosium-containing carbon carrier is placed in a first solvent to be subjected to ultrasonic dispersion, and turbid liquid is obtained; adding a soluble platinum salt and a soluble transition metal salt into the turbid liquid, and mixing to obtain a mixed liquid; removing the first solvent in the mixed solution to obtain a solid product; and calcining and etching the solid product to obtain the dysprosium-doped platinum-based catalyst. The dysprosium-containing carbon carrier is adopted to load the platinum-based intermetallic compound, so that dysprosium and the platinum-based nanoparticles can realize relatively strong association and generate interaction among electrons, atom diffusion is further promoted, the crystallinity is improved, and the electronic structure of the platinum nanoparticles is favorably adjusted. The dysprosium-doped platinum-based catalyst is relatively high in internal order degree, and has relatively high activity and stability when being applied to an acidic ORR reaction.

The present application relates to the field of fossil resource recycling and fuel cell catalyst technology, and specifically to a method for preparing a platinum iron carbon catalyst using waste rubber powder, a platinum iron carbon catalyst and its application. The method of the present application comprises: subjecting a first waste rubber powder to pyrolysis treatment to obtain pyrolytic carbon; mixing the pyrolytic carbon with a metal salt, a chelating agent and water to obtain a first mixture; the metal salt comprises a platinum salt and an iron salt; heating the first mixture under stirring to obtain a sol; drying the sol and then calcining it to obtain a catalyst precursor; mixing a second waste rubber powder with a catalyst precursor to obtain a second mixture; subjecting the second mixture to microwave radiation treatment to obtain a platinum iron carbon catalyst. The technical solution of the present application provides a method for preparing a high-activity platinum carbon iron catalyst with a simple process and low cost, and also realizes the high-value recycling of waste rubber.

The invention discloses a method for selectively preparing C6 ketone and 1, 2-hexanediol by accelerating cellulose hydrolysis based on a crude hydrogen atmosphere. The method comprises the following steps: by taking cellulose as a raw material, water as a solvent and activated carbon supported Pt as a catalyst, reacting for 1-6 hours under the conditions that the total pressure of hydrogen source gas containing CO and CO2 is 0.5-4.0 MPa and the temperature is 210-260 DEG C, and accelerating cellulose hydrolysis to obtain a product mainly comprising a C6 ketone compound and 1, 2-hexanediol; the catalyst is obtained by adding a pretreated carbon carrier into an ethanol solution, adding a platinum salt precursor solution, sealing, carrying out a hydrothermal reaction, carrying out suction filtration, washing and drying. According to the invention, the yield of C6 ketones is up to 53.4%, and the yield of 1, 2-hexanediol is up to 15.6%.

The invention discloses a purple phosphorus-based monatomic catalyst for efficient hydrogen evolution and a preparation method of the purple phosphorus-based monatomic catalyst, and belongs to the technical field of catalysts. The preparation method comprises the following steps: treating block purple phosphorus by a liquid-phase ultrasonic stripping method to obtain a purple phosphorus precursor serving as a carrier; mixing a platinum salt solution with the purple phosphorus precursor to form a mixed solution; and carrying out irradiation treatment on the mixed solution by adopting a standard solar spectrum, so that platinum ions in the platinum salt are reduced and anchored on the purple phosphorus precursor in a monatomic form, thereby obtaining the purple phosphorus-based monatomic catalyst. The whole technological process only relates to common raw materials such as purple phosphorus and trace platinum salt, operation is easy and convenient, cost is low, and product purity is high. According to the method, the monatomic catalyst with a clear structure is successfully constructed through ingenious process design by utilizing the confinement effect of purple phosphorus and the synergistic effect of photoreduction, and a solid foundation is laid for the monatomic catalyst to show high catalytic activity and excellent stability in a hydrogen evolution reaction.

The invention belongs to the technical field of fuel cells, and particularly relates to a platinum-based alloy electrocatalyst for enhancing a built-in electric field based on heterogeneous transformation as well as a preparation method and application of the platinum-based alloy electrocatalyst. The preparation method comprises the following steps: dissolving a soluble platinum salt, a soluble palladium salt, a soluble tin salt and a soluble bismuth salt in a mixed solvent of oleylamine and 1-octadecene, then adding ascorbic acid, and ultrasonically mixing uniformly; the platinum-based alloy electrocatalyst is prepared by the following steps: putting the platinum-based alloy into an oil bath for heating, carrying out two-step heating reaction, washing, centrifuging and collecting, loading activated carbon, and then carrying out electrochemical reconstruction to obtain the platinum-based alloy electrocatalyst based on the heterogeneous transformation enhanced built-in electric field. According to the platinum-based alloy electrocatalyst, a simple wet chemical method is adopted, the prepared platinum-based alloy electrocatalyst for enhancing the built-in electric field based on heterogeneous transformation is subjected to heterogeneous transformation, and the built-in electric field is enhanced, so that the platinum-based alloy electrocatalyst has excellent catalytic activity, toxicity resistance and stability, and has wide application prospects in the fields of ethanol electrocatalysis and fuel cells.

The invention belongs to the technical field of fuel cell catalysts, and particularly relates to a platinum-based hydrogen fuel cell catalyst and a preparation method and application thereof. The preparation method comprises the following steps: carrying out step-by-step gradient heating oxidation treatment on a carbon carrier in an air atmosphere, then mixing with a platinum salt solution, and then carrying out step-by-step gradient heating reduction treatment on the mixed reaction solution under the protection of inert gas so as to regulate and control the particle size, dispersity and stability of platinum particles. The obtained platinum-based hydrogen fuel cell catalyst is high in activity and good in stability, the catalyst shows excellent performance on a membrane electrode, and meanwhile the preparation method is simple in synthesis process and low in cost.

The present application relates to a nitrogen-doped carbon-supported Pt / Ca bimetallic atom electrocatalyst and its preparation method and application, and belongs to the field of catalyst preparation technology. The preparation method of the electrocatalyst of the present application comprises the following steps: S1, dissolving dimethylimidazole in methanol I, marked as solution A; dissolving zinc salt, platinum salt and calcium salt together in methanol II, marked as solution B; pouring solution B into solution A, and vigorously stirring to form a uniformly dispersed solution; S2, hydrothermally reacting the uniformly dispersed solution, and naturally cooling to room temperature after the reaction is completed, centrifuging, washing and vacuum drying the product to obtain a Pt‑Ca‑ZIF8 precursor; S3, grinding the Pt‑Ca‑ZIF8 precursor to granular form, adding sodium chloride, performing high-temperature pyrolysis under a protective atmosphere, stirring, washing, filtering and vacuum drying to obtain a nitrogen-doped carbon-supported Pt / Ca bimetallic atom electrocatalyst. The electrocatalyst of the present application reduces the price cost while maintaining excellent performance and stability.

The invention discloses a preparation method of a Pt-coated Ce-N-C catalyst, the Pt-coated Ce-N-C catalyst, a membrane electrode and a fuel cell, and relates to the technical field of cells, the preparation method of the Pt-coated Ce-N-C catalyst comprises the following steps: S1, mixing soluble cerium salt, soluble zinc salt, an organic ligand and a solvent for a first time for reaction to obtain Ce-ZIF-8; s2, under the protection of a nitrogen atmosphere, mixing Ce-ZIF-8, a soluble platinum salt and a reducing agent for the second time, and performing reduction treatment to obtain a Pt-coated Ce-ZIF-8 precursor; and S3, carrying out calcination treatment on the Pt-coated Ce-ZIF-8 precursor in an argon atmosphere, and carrying out acid pickling to obtain the Pt-coated Ce-N-C catalyst. According to the present invention, the composite carrier having functions of cerium-doped free radical active scavenging, nitrogen-doped carbon armor structure passive shielding and platinum poisoning resistance is constructed, such that the catalytic activity, the durability and the poisoning resistance of the fuel cell are synergistically improved.

The invention discloses a high-current high-stability hydrogen evolution platinum-based catalyst, a preparation method thereof and a water electrolysis hydrogen production method. The preparation method of the hydrogen evolution platinum-based catalyst comprises the following steps: S1, carrying out precipitation reaction on dimethylimidazole, a sulfur source, a zinc source and a cobalt source in water to obtain a cobalt-zinc bimetal organic framework material; s2, pyrolyzing the cobalt-zinc bimetal organic framework material under the protection of inert gas so as to evaporate zinc to leave vacancies during carbonization, thereby obtaining a cobalt nanoparticle-loaded nitrogen-sulfur co-doped carbon carrier; and S3, carrying out chemical reduction reaction on the cobalt nanoparticle-loaded nitrogen-sulfur co-doped carbon carrier and platinum salt under the action of a reducing agent to load platinum nanoparticles on the carrier, thereby obtaining the hydrogen evolution platinum-based catalyst. The sulfur element can improve the specific surface area of the substrate material and the dispersibility of platinum and cobalt elements, so that the active sites are greatly improved; the catalyst has excellent hydrogen evolution activity and stability, and the utilization rate of precious metal platinum can be effectively increased.