485 results about "Alloy catalyst" patented technology

The invention discloses a method for preparing a platinum-based alloy catalyst by using a plasma enhanced chemical vapor deposition low-temperature technology, relates to a preparation method of a platinum-based alloy catalyst, and aims to solve the technical problems that a carbon layer is not uniformly coated and metal particles of the catalyst are easy to agglomerate in a high-temperature calcination process in the existing platinum-based alloy catalyst prepared by carbon coating. The method comprises the following steps: 1, preparing Pt / C by a polyhydric alcohol reduction method; 2, pre-treating a Pt / C catalyst; 3, preparing M-Pt / C by a dipping evaporation method; 4, PECVD carbon shell coating is carried out; (5) alloying; and 6, removing a part of carbon shell to obtain the platinum-based alloy catalyst. When the Pt / C catalyst is used for preparing a membrane electrode of a proton exchange membrane fuel cell, the peak power density can reach 1.72-1.89 W / cm < 2 > under a hydrogen-air condition, which is improved by 20.3% and 32.2% compared with a membrane electrode of a commercial 20% Pt / C catalyst, and the Pt / C catalyst can be used in the field of proton exchange membrane fuel cells.

The invention provides a preparation method of a cobalt-based bimetallic alloy positive electrode lithium supplement composite material and an application technology of the cobalt-based bimetallic alloy positive electrode lithium supplement composite material in a battery. The lithium-supplementing composite material is a lithium salt, a cobalt-based bimetallic alloy catalyst for promoting low-pressure decomposition of the lithium salt, and a positive electrode material. The lithium salt is lithium oxalate, the cobalt-based bimetallic alloy catalyst is prepared from nitrogen and sulfur co-doped carbon impregnated in a transition metal salt solution through freeze drying and high-temperature calcination, and the positive electrode material comprises one of lithium iron phosphate, lithium cobalt oxide and ternary high nickel (LiMO2, M = Ni, Co and Mn). When the lithium supplement agent is applied to a secondary lithium ion battery, the decomposition voltage of the lithium supplement agent can be reduced, the irreversible loss of capacity is reduced, and the initial coulombic efficiency is improved.

The invention discloses a synthesis method of an in-situ carbon-loaded osmium-platinum single-phase solid solution nano-alloy catalyst and application of the nano-alloy catalyst in a hydrogen evolution reaction, and solves the technical problems that when an existing osmium-platinum alloy catalyst is used, the loading process is tedious and time-consuming, and the catalytic performance becomes poor due to non-uniform loading. The method comprises the following steps: respectively weighing an osmium compound and a platinum compound, mixing the osmium compound and the platinum compound, and adding the mixture into a polyol solvent until the mixture is completely dissolved to obtain a precursor solution; the preparation method comprises the following steps: preparing a carbon carrier, adding the carbon carrier into a polyol solvent until the carbon carrier is completely dissolved to obtain a carrier solution, and heating the carrier solution to 150-300 DEG C; in an inert atmosphere, adding the precursor solution into the heated carrier solution within two minutes, uniformly stirring, and preserving heat to obtain a mixed solution; and sequentially washing, centrifuging and drying to obtain the in-situ carbon loaded osmium-platinum solid solution nano-alloy catalyst. The method is simple in synthesis and high in synthesis efficiency, and the catalyst which is uniformly dispersed in a loaded state can be obtained.

The invention relates to a hollow mesoporous carbon sphere prepared based on a confinement polymerization method and a preparation method of a platinum alloy catalyst loaded by the hollow mesoporous carbon sphere and doped with rare earth metal. The method comprises the following steps: by taking mesoporous silica as a template, introducing an initiator and a small molecular organic matter precursor into mesopores, and carrying out confinement polymerization in the mesopores to obtain a silica / polymer composite; carrying out high-temperature calcination and etching treatment on the complex to obtain hollow mesoporous carbon spheres; the carbon sphere is used as a carrier to load a platinum alloy doped with rare earth metal. The hollow mesoporous carbon spheres prepared by the method have good spherical morphology and mesoporous channels and high specific surface area, and the problems of non-uniform morphology, unobvious mesopores and the like in a traditional method are solved. After platinum alloy particles doped with rare earth metal are loaded on the carbon spheres, the problems of agglomeration, wide particle size distribution, poor performance and the like of the platinum alloy particles are solved.

The invention belongs to the technical field of catalytic materials and hydrocarbon reforming, and particularly relates to a high-entropy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution containing lanthanum, chromium, copper, zinc, manganese, nickel, iron and cobalt ions with a chelating agent and a dispersing agent for reaction, carrying out ultrasonic cavitation treatment to obtain sol, adjusting the pH value, gelatinizing under an oil bath heating condition to obtain a colloidal precursor, drying, and calcining in an air atmosphere to obtain a perovskite type high-entropy oxide precursor; and then treating in a reducing atmosphere to obtain the FeZnCuNiCo perovskite type high-entropy alloy catalyst which contains metal components of La, Cr, Ni, Mn, Fe, Zn, Cu and Co and takes a multi-metal alloy active center of Fe-Zn-Cu-Ni-Co as a main component. The high-entropy catalyst can meet the harsh requirements of high temperature, strong carbon deposition driving force and long-period operation in a propane dry reforming reaction, and is suitable for industrial application scenarios of continuous production of high-temperature synthesis gas.

The invention belongs to the technical field of catalysts, and discloses a rare earth platinum alloy catalyst and a preparation method and application thereof. The catalyst comprises a nitrogen-doped carbon carrier, and a PtGd alloy and a Ni elementary substance are loaded on the nitrogen-doped carbon carrier. The preparation method comprises the following steps: (1) preparing a Gd-ZIF material; and (2) uniformly mixing the Gd-ZIF, the platinum source solution and the nickel source solution, carrying out vacuum drying treatment, heating to 700-1000 DEG C in a reducing atmosphere, keeping the temperature for 1-2 hours, and cooling to room temperature to obtain the rare earth platinum alloy catalyst. The invention discloses application of a rare earth platinum alloy catalyst which is used as a cathode oxygen reduction reaction catalyst of a hydrogen fuel cell. The preparation method disclosed by the invention is simple to operate and can be used for large-scale preparation; the Pt content of the rare earth platinum alloy catalyst prepared by the method is reduced to 13%, and the cost of raw materials is directly and greatly reduced; the maximum half-wave potential of the rare earth platinum alloy catalyst can reach 0.93 V vs.RHE which is far higher than that of commercial Pt / C.

The invention discloses a method for preparing a methanol fuel cell anode catalyst by doping a modified multi-walled carbon nanotube carrier. The method comprises the following steps: 1) acidizing an unmodified multi-walled carbon nanotube; (2) preparing the cerium oxide doped modified multi-walled carbon nanotube; and 3) preparing the cerium oxide doped modified multi-walled carbon nanotube carrier loaded PtFe bimetallic alloy catalyst. According to the method disclosed by the invention, the MWCNTs are induced by doping CeO2 to generate more oxygen vacancy defects, so that anchoring of more active sites of the PtFe alloy is facilitated, and MOR is promoted to improve the activity of the catalyst; the stable Ce < 4 + > can deform the surface structure of Pt, so that the binding bond energy of COads and-OH is stronger, and an anti-poisoning effect is achieved; the introduced Fe element and Pt have metal electronegativity difference, so that the adsorption bond energy of formic acid, formaldehyde and carbon monoxide intermediates generated by gradual dehydrogenation of Pt and methanol can be weakened, and the anti-toxicity effect is achieved; and the PtFe alloy and the CeO2 / MWCNTs are in synergistic interaction, so that the stability of the catalyst can be enhanced.

The invention relates to a membrane electrode and application thereof in deuterium-enriched water, and belongs to the field of clean energy development and utilization. The membrane electrode comprises a proton exchange membrane, an anode catalyst and a cathode catalyst, the anode catalyst is an iridium / iridium oxide catalyst with a three-dimensional porous network structure, and the cathode catalyst is a platinum-ruthenium alloy catalyst. The preparation method comprises the following steps: coating one side of the N117 proton exchange membrane with the anode catalyst, coating the other side of the N117 proton exchange membrane with the cathode catalyst, and then performing hot pressing to prepare the membrane electrode. The method comprises the following steps: assembling a membrane electrode into an electrolytic cell, and electrolyzing water by using the electrolytic cell to realize deuterium enrichment. The membrane electrode and the electrolytic cell are reasonable in design, the preparation process is simple and controllable, and the obtained product is high in efficiency and long in service life when used for enriching deuterium and facilitates industrial application.

The invention discloses a surface oxidation monatomic nano-alloy catalyst as well as a preparation method and application thereof, and belongs to the technical field of advanced nano-energy materials and electro-catalysis. A surface-oxidized monatomic nano-alloy catalyst comprises a hydroxylated carbon nanotube carrier and bimetallic nano-alloy particles loaded on the hydroxylated carbon nanotube carrier, in the bimetallic nano-alloy particles, non-noble metal elements are dispersed in noble metal nano-particles in a monatomic form, the size of the bimetallic nano-alloy particles is 3-4 nm, and the surface-oxidized monatomic nano-alloy catalyst is prepared from a surface-oxidized monatomic nano-alloy catalyst. An oxide layer with the thickness of 0.3-0.6 nm is arranged on the surface of the bimetallic nano-alloy particle; the loading amount of the noble metal is 5-15wt%. Ruthenium and other non-noble metal elements are alloyed and anchored on the carbon material substrate, the conductivity of the catalyst can be greatly improved, the size of alloy particles is accurately controlled within the range of 3-4 nm, active sites can be exposed to the maximum extent, and structural stability is considered.

The invention belongs to the technical field of new energy and electrochemistry, and particularly relates to a corrosion-resistant structured transition metal alloy electrode suitable for hydrogen production from alkaline water and a preparation method of the corrosion-resistant structured transition metal alloy electrode. The method comprises the following steps: sequentially carrying out sand blasting treatment and electrochemical activation treatment on a nickel net substrate so as to improve the surface roughness and the number of active sites; and then performing constant-current deposition in an electro-deposition solution containing nickel salt and ferric salt and / or cobalt salt, and constructing a nickel-based alloy catalyst layer in a micron array shape to obtain the alloy electrode. Through observation of a scanning electron microscope, the surface of the obtained electrode has a sphere-like microstructure, the arrangement is compact, and the catalytic efficiency and durability can be improved. The prepared structured alloy electrode has the advantages of being high in interface bonding force, high in electro-catalytic performance, high in alkali corrosion resistance and the like, and is suitable for efficient and long-term operation of hydrogen production through alkaline electrolysis of water.

The preparation method comprises the following steps: 1) mixing carbonate, a copper precursor, a silver precursor and a supporting electrolyte, and heating the mixture to 400-600 DEG C in a protective atmosphere to obtain a molten electrolyte; 2) introducing a protective atmosphere into a gas washing bottle containing deionized water, and continuously introducing gas flowing out of the gas washing bottle into the bottom of the molten electrolyte; and (3) taking a graphite sheet or a metal sheet as a cathode, taking a graphite rod as an anode, applying 1.8-2.5 V constant voltage or 100-300 mA. Cm <-2 > constant current to electrolyze for 0.5-10 hours, taking out the cathode, scraping off powder on the surface, and performing ultrasonic washing and drying. The preparation of the high-load and high-dispersion copper-silver double-monatomic alloy catalyst is realized, and the preparation method has the advantages of simple synthesis method, good process controllability, low production cost, environmental friendliness, high electrolytic efficiency and the like, and has a wide application prospect.

The invention discloses a coated SiC-coated NiFe microwave catalyst, a preparation method thereof and an application of the coated SiC-coated NiFe microwave catalyst in catalytic conversion of polyolefin plastics, and relates to the technical field of preparation of catalysts and chemical recovery of plastics. The coated SiC-coated NiFe microwave catalyst comprises a porous silicon carbide round rod and a nickel-iron alloy catalyst layer coated on the surface of the porous silicon carbide round rod. According to the coated SiC-coated NiFe microwave catalyst, a porous SiC rod is coated with NiFe-gel through a sol-gel method, a precursor is prepared, and then thermal reduction treatment is performed, so that the coated SiC-coated NiFe microwave catalyst is obtained. According to the coated SiC-coated NiFe microwave catalyst disclosed by the invention, polyolefin plastic can be quickly and highly selectively converted into hydrogen and carbon nanotubes. Compared with the traditional chemical recovery technology, the method has the characteristics of rapid reaction, high selectivity and environmental protection. And the coated SiC-coated NiFe microwave catalyst has the advantages of simple synthesis method, excellent wave absorbing performance, low energy consumption, stable performance and the like, is a recycled material which is more energy-saving and lower in cost, and shows wide practical application value.

The invention belongs to the technical field of battery catalysts, and discloses a carbon-supported platinum-cobalt ordered alloy catalyst and a preparation method and application thereof. The carbon-loaded platinum-cobalt ordered alloy catalyst comprises a porous carbon carrier and an active component loaded on the porous carbon carrier, the active components comprise platinum and cobalt, and the platinum and the cobalt form a face-centered cubic structure with ordered atom arrangement. The carbon-supported platinum-cobalt ordered alloy catalyst has the advantages of better catalytic efficiency, stability and durability, and is beneficial to further improvement of the performance of the fuel cell.

The invention discloses a NiCu-based alloy catalyst for preparing high-value products through natural gas decarbonization and application of the NiCu-based alloy catalyst, and belongs to the technical field of natural gas high-value catalytic conversion. The preparation method of the NiCu-based alloy catalyst comprises the following steps: (1) adding nickel nitrate hexahydrate and urea into hot water, adding ethylene glycol, carrying out a stirring reaction at 120-150 DEG C, and calcining the obtained intermediate to obtain a nickel oxide precursor; (2) adding a copper nitrate aqueous solution and ammonia water into the nickel oxide precursor, so that copper ions are anchored on the surface of nickel oxide, drying and calcining to obtain a Ni-Cu alloy oxide precursor; and (3) adding the Ni-Cu alloy oxide precursor, bismuth trioxide and metallic tin into deionized water, adding a complexing agent, carrying out ultrasonic treatment, and carrying out H2 reduction calcination on the obtained precipitate to obtain the Ni < x > Cu < y > Bi < z > Snm alloy. The NiCu-based alloy catalyst is used in a natural gas decarburization high-value product preparation reaction, and the natural gas decarburization reaction is sufficient, and long-term efficient conversion and stable operation are achieved by combining the synergistic effect of ultrasonic waves and an alternating magnetic field.

The present invention belongs to the technical field of electrolytic water catalysts and relates to a low-Pt high-entropy alloy electrolytic water catalyst, a preparation method, and an application thereof. Five metal elements, namely, Mn, Ni, Cu, Pt, and any one of La, Mo, Co, V, and Ti, are selected and combined to prepare an efficient and stable high-entropy alloy catalyst. No pH adjustment is required during the process, and the process is simple, easy to operate, and the preparation cost is low, thus enabling industrial production. The MnNiCuPt (La, Mo, Co, V, Ti) high-entropy alloy catalyst prepared by the present invention exhibits excellent electrolytic water performance, thereby reducing the catalyst cost and improving the catalytic performance.

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 high-entropy alloy catalyst for coal chemical wastewater treatment and a preparation method thereof, and belongs to the technical field of catalysts. The preparation method comprises the following steps: taking hard shells as a raw material, crushing, introducing carbon dioxide into a tubular furnace for calcining and activating, cooling and sieving to obtain an activated carbon carrier with a high specific surface area; the preparation method comprises the following steps: performing acid modification on the prepared high-specific-surface-area activated carbon by using a nitric acid solution to increase the average pore size, total pore volume and mesopore volume of the activated carbon, soaking the modified carrier in a nitrate solution, and roasting to load cobalt oxide, manganese oxide and the like on the surface of the carrier; the high-entropy metal oxide enables metal ions to generate a synergistic effect, and the oxidation-reduction capability of the catalyst is enhanced, so that the degradation efficiency and the stability of the catalyst are improved; the prepared catalyst is stable in effect, especially has an excellent degradation effect on coal chemical wastewater, and has a wide market prospect.

The invention provides a gradient composite graphene electrolysis electrode plate and an in-situ preparation method thereof. The electrode plate comprises a metal conductive base material (such as titanium alloy), a porous ceramic skeleton layer (Al2O3-40% ZrO2, the porosity of which is 30 + / -5%), a chemical copper plating layer for filling pores, an electroplated nickel-ruthenium alloy catalytic layer (Ni: Ru = 9: 1) and 3-5 graphene functional layers (ID / IG is less than or equal to 0.08) grown in situ, wherein the porous ceramic skeleton layer (Al2O3-40% ZrO2) is laser-cladded on the surface of the porous ceramic skeleton layer (Al2O3-40% ZrO2). The preparation method comprises the following steps: performing laser cladding on a ceramic skeleton, wherein the power density is 300-500W / mm < 2 >, and sintering at 1600 DEG C to form metallurgical bonding; gradient plating: electroless copper plating (containing nano-diamond enhancement) and pulse electroplating of Ni Ru (duty ratio is 1: 5); and performing directional CVD growth: after reducing the catalyst layer by H2 at 1050 DEG C, introducing CH4 / H2 (the volume ratio is 1: 4) in a pulse manner, and realizing full coverage of the inner wall of the mesh by vortex air intake. The technical effects are as follows: (1) the overpotential of chlorine evolution in saturated salt water at 80 DEG C is as low as 268mV (1A / cm < 2 >); (2) strong acid environment service life gt; the time is 100 thousand hours (12 times that of the national standard); (3) the production cost is lt; and 620 / m < 2 > (90% lower than that of a traditional ruthenium-iridium coating). The problems of graphene transfer damage and special-shaped electrode covering are solved.

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 invention relates to a multi-conductive-agent composite conductive paste for a lithium battery and a preparation method of the multi-conductive-agent composite conductive paste, and belongs to the technical field of lithium battery conductive pastes.The multi-conductive-agent composite conductive paste is characterized in that an iron-molybdenum catalyst is loaded on expanded graphite, then vertical orientation carbon nanotubes and transverse graphene blades are grown in situ, the specific surface area is increased, and the expanded graphite serves as a layered carrier; a metal alloy catalyst can be uniformly loaded in natural pores of the carbon nanotube, a layered framework is kept from collapsing at a high temperature, support is provided for directional growth of a carbon material, electrons can be rapidly transmitted along the carbon nanotube when the composite conductive paste is prepared, gaps of the carbon nanotube are filled by graphene blades, a breakpoint-free conductive network is formed, and the composite conductive paste is prepared. And meanwhile, abundant pores provide channels for lithium ion diffusion, so that the conductive efficiency is improved from the source of the structure, and abundant specific surface area and subsequent nitrogen and sulfur loading provide sufficient sites.

The invention belongs to the technical field of catalytic materials, and particularly relates to a nickel-iron-cobalt entropy alloy nanowire three-dimensional interconnection grid film and a preparation method and application thereof. The preparation method comprises the following steps: taking an aluminum sheet containing copper impurities as a substrate, and preparing a three-dimensional ordered porous aluminum oxide template through anodic oxidation; then, the nickel-iron-cobalt entropy alloy nanowire is prepared in a pore channel limited range through direct current co-electrodeposition; the nickel-iron-cobalt entropy alloy nanowire three-dimensional interconnection grid film is obtained after the aluminum substrate and the 3D-AAO template are removed, the material is based on the mixed entropy effect and structural integrated design and can be directly used as a self-supporting electrode for efficiently and stably electrolyzing water for oxygen evolution, the three-dimensional grid structure and the self-supporting characteristic of the material promote electrolyte transmission and gas product desorption, and the oxygen evolution efficiency is improved. The mass transfer efficiency is improved, the use of a traditional binder is avoided, and the electrode stability is enhanced; the problems that an existing medium-entropy alloy catalyst is high in synthesis energy consumption, the catalytic activity is poor under the industrial-grade large-current working condition, active substances fall off in the reaction and the like are solved.

The invention belongs to the technical field of biological medicine, and discloses a preparation method of ionizable cationic lipid. The preparation method comprises the following steps: reacting 7-oxoheptyl caprate with hydroxylamine or hydroxylamine salt in the presence of alkali in the presence of a reducing agent and a cobalt-ruthenium alloy catalyst; (9Z, 12Z)-octadecane-9, 12-dienal is added into the reaction product, the reaction continues in the presence of a reducing agent, and a hydroxylamine derivative intermediate is obtained; and performing amidation reaction with 4-dimethylaminobutyric acid or hydrochloride thereof in the presence of a condensing agent and a catalyst to obtain the ionizable cationic lipid. The invention also discloses an application of the ionizable cationic lipid, the lipid nanoparticle composition or the mRNA-loaded lipid nanoparticles obtained by the preparation method in preparation of a pharmaceutical composition or a kit for mRNA delivery. The LNP provided by the invention has good physicochemical properties, biocompatibility and efficient mRNA encapsulation and intracellular delivery capabilities, and can be applied to preparation of pharmaceutical compositions or kits for mRNA delivery.

The invention provides a carbon-supported platinum-cobalt-copper multifunctional alloy catalyst and a preparation method and application thereof, and belongs to the technical field of energy materials. Wherein the nanocarbon carrier solution is mixed with a chloroplatinic acid solution, a cobalt chloride solution and a copper chloride solution, a sodium hydroxide aqueous solution is added to adjust the pH value, ultrasonic dispersion and stirring are performed to obtain turbid liquid, and the molar ratio of platinum ions to cobalt ions to copper ions is 2: (0.5-1): (0.5-1); then, putting the turbid liquid into a reaction kettle, and reacting at 120-250 DEG C for 1-6 hours to obtain a black colloidal solution; then filtering, washing and drying the black colloidal solution to obtain black powder; and finally, carrying out acid treatment on the black powder, and grinding to obtain the carbon-loaded platinum-cobalt-copper multifunctional alloy catalyst. The catalyst is used for catalyzing an oxygen reduction reaction of a cathode in a hydrogen fuel cell and / or a methanol fuel cell, and / or catalyzing a methanol oxidation reaction of an anode in a direct methanol fuel cell.

The invention provides a nickel-molybdenum-based rare earth element doped core-shell catalyst for hydrogen production by alkaline electrolysis of water as well as a preparation method and application of the nickel-molybdenum-based rare earth element doped core-shell catalyst, and belongs to the technical field of hydrogen production by alkaline electrolysis of water. Aiming at the problems that Mo is easy to dissolve out in an alkaline medium, the stability is poor, the catalyst depends on a substrate, the preparation is complicated and the like in the existing nickel-molybdenum alloy catalyst, a Ni4Mo alloy is constructed as a core through trace RE doping, coprecipitation and reducing atmosphere annealing; the surface is coated with a core-shell structure of RE-MoO3-x rich in oxygen vacancies, a RE-MoO3-x shell layer accelerates water dissociation and generates a synergistic effect with a Ni4Mo core to drive a hydrogen intermediate to migrate to the core to realize efficient hydrogen evolution, and a formed Mo-O-RE bond can anchor Mo and inhibit the Mo from being dissolved out. When the catalyst is used for hydrogen production by alkaline electrolysis of water, the overpotential is as low as 53mV in 1M KOH under the current density of 10mA / cm < 2 >, the catalyst can stably run for over 300h, and the catalyst has high activity and high stability and is simple to prepare.

The invention relates to the field of preparation of catalysts, in particular to a production method of a carbon-based alloy catalyst. The production method comprises the following steps: (1) loading active metal on a carbon carrier to obtain a first precursor; (2) enabling first reducing gas to penetrate through the first precursor prepared in the step (1), and performing first fluidized calcination to obtain a second precursor; (3) sequentially carrying out acid pickling and drying on the second precursor obtained in the step (2) to obtain a third precursor; and (4) enabling a second reducing gas to penetrate through the third precursor prepared in the step (3), and carrying out second fluidized calcination. The catalyst is prepared through two-step fluidized calcination, macro preparation of the carbon-based alloy catalyst can be achieved, effective combination of laboratory basic research and actual industrial production is successfully achieved, the process of large-scale commercial application of fuel cells is expected to be promoted, and the prepared catalyst is high in alloying degree and good in industrial application prospect. The excellent electrochemical activity is shown.

The present invention relates to a PtSn disordered alloy sub-nanometer catalyst for propane dehydrogenation. The catalyst uses γ-Al2O3 nanospheres as a carrier, and the active component Pt is diluted to a single-atom dispersion state by excessive Sn. During the high-temperature H2 reduction process, the Sn atoms around Pt are reduced by the hydrogen spillover effect of Pt atoms, and finally a PtSn disordered alloy sub-nanometer catalyst is formed. Among them, the mass percentage of Pt is 0.01-0.1%, the mass percentage of Sn is 0.08-2%, and the mass ratio of Pt to Sn is 1:10-1:12. This PtSn disordered alloy sub-nanometer catalyst has a simple preparation process and excellent catalytic performance, with high reaction activity and strong stability, and has broad application value in reducing the consumption of precious metals and improving reaction activity.

The invention discloses a RuNi alloy electrocatalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. Ruthenium acetylacetonate and nickel acetylacetonate are used as precursors, a dispersing agent of polyvinylpyrrolidone is added, the mixture is dissolved in a mixed solvent of benzyl alcohol and aniline, and a mixed solution is obtained; the preparation method comprises the following steps: uniformly stirring, sealing in a reaction kettle, continuously preserving heat at a certain reaction temperature, continuously stirring in the reaction process, and centrifugally drying after the reaction is finished to obtain the RuNi alloy catalyst. The agglomeration of the RuNi alloy nano-particles is effectively prevented, and the nano-particles are ensured to be uniformly dispersed in the synthesis process, so that the catalyst with uniform size and good dispersity is obtained. Through in-situ growth of the Ru element on the surface of the Ni nanostructure, catalytic sites of noble metal are utilized to the maximum extent, excellent conductivity and structural stability of Ni are exerted, the hydrogen evolution effect of the catalyst under the alkaline condition is remarkably improved, and the catalytic activity is improved.

The invention discloses a mercaptan-coated proton exchange membrane fuel cell cathode catalyst slurry, a preparation method and a membrane electrode, and the method comprises the following steps: step 1, dispersing carbon black in a water-alcohol solution and a surfactant to obtain a carbon black solution; 2, respectively preparing a platinum precursor solution and a cobalt precursor solution; 3, mixing the carbon black solution, the platinum precursor solution and the cobalt precursor solution, removing the solvent, and performing thermal reduction in reducing gas to obtain a binary ordered alloy catalyst; the temperature of the thermal reduction ranges from 700 DEG C to 1000 DEG C, and the time ranges from 0.5 h to 2 h. Step 4, dissolving the mercaptan powder in a mixed solvent of deionized water and isopropanol according to a ratio of 1: 1 to prepare a 1wt% mercaptan-containing solution; then, cooling the solution to 5 DEG C until solid substances are completely dissolved; and step 5, fully mixing the catalyst with the prepared mercaptan solution. And step 6, removing excessive mercaptan, and centrifuging the solution at the rotating speed of 10000 revolutions per minute for 10 minutes. And drying the precipitate in a vacuum drying oven for 12 hours to obtain the catalyst. The mercaptan-coated binary alloy catalyst prepared by the method can avoid poisoning effect of sulfonate radicals on Pt, improves expression of catalyst activity, and is helpful for improving performance of a fuel cell.

The invention relates to a ternary platinum-based ordered alloy catalyst, a preparation method thereof and a fuel cell, and the preparation method comprises the following steps: ball-milling and uniformly mixing an organic small molecule ligand, a Pt precursor, an M1 precursor, an M2 precursor and a carbon carrier, and calcining to obtain the ternary platinum-based ordered alloy catalyst, the small organic molecule ligand comprises doping elements, and the doping elements comprise an N element and / or an S element; in the precursors of M1 and M2, M1 and M2 are each independently a transition metal element. According to the preparation method, ball milling and high-temperature calcination are combined, small organic molecule ligands are added in the ball milling and mixing stage to participate in the reaction, coordination bonds can be formed among the small organic molecule ligands, Pt particles and transition metal particles, S and / or N in the small organic molecule ligands are doped into a bulk phase of alloy particles, meanwhile, the phenomenon of catalyst agglomeration caused by ball milling can be effectively prevented, and the catalyst stability is improved. No solvent is needed in the preparation process, especially no organic solvent is used, and the preparation method is simple, safe and suitable for large-scale production.

Compositions and methods for the catalysis of methane pyrolysis. Compositions include a catalyst that includes a medium entropy alloy particle. Methods include catalyzing the pyrolysis of methane using the catalyst.