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39results about How to "High quality activity" patented technology
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Nano-grade composite catalyst, and preparation method and application thereof
ActiveCN105312087AExcellent quality and activityHigh quality activityCell electrodesOrganic-compounds/hydrides/coordination-complexes catalystsFiberCarbon fibers
The invention discloses a nano-grade composition, a preparation method thereof, and an application thereof as an electrochemical catalyst. The nano-grade composition provided by the invention is basically composed of a melamine derivative, a carbon material, and transition metal or transition metal alloy nano-cluster. The carbon material comprises at least one selected from conductive carbon black, activated carbon, carbon nano-horn, N-doped carbon nano-horn, carbon nano-tube, graphene, graphite and carbon fiber material. The metal nano-cluster is at least one selected from Pt, Ru, Pd, Rh and Ir nano-clusters. The alloy nano-cluster is nano-cluster formed by more than two elements selected from Pt, Ru, Pd, Rh, Ir, Fe, Cu and Ni. The mass percentage content of the transition metal or alloy nano-cluster is 0.1-90%. The size of the transition metal or alloy nano-cluster is 0.5-10nm. As a fuel cell catalyst, the nano-grade composition provided by the invention has excellent electrocatalytic activity upon reactions such as oxygen reduction and methanol oxidation.
Owner:无锡盛鑫氢能科技有限公司
Fresh keeping agent containing essential oil, for fruits, and application
InactiveCN106359567AImprove antioxidant capacityGood antibacterial effectFruit and vegetables preservationDistilled waterPolyphenol
The invention discloses a fresh keeping agent containing essential oil, for fruits, and an application. The fresh keeping agent for fruits is characterized by being compounded from lysozyme, tea polyphenols, nisin, essential oil A, essential oil B, Vc and distilled water in a certain proportion. According to the fresh keeping agent for fruits, disclosed by the invention, the essential oil is optimized to be used as a main component of the fresh keeping agent, so that the fresh keeping agent has excellent effects of bacteriostasis and oxidation resistance and is applied to corrosion resistance and fresh keeping of the fruits, the fresh keeping and storage period of the fruits can be greatly prolonged, the fruits are guaranteed to maintain original quality in the fresh keeping period, and the quality of the fruits is effectively guaranteed. The fresh keeping agent for the fruits, disclosed by the invention is simple in compounding method, and convenient to apply; and the fresh keeping agent is completely compounded from natural components, and harmful chemical substances are not added, so that the fresh keeping agent is safe and environmental-friendly, and has an important industrial value.
Owner:王开
Pdx@Pt/C core-shell structure cathode catalyst for fuel cell and preparation method of Pdx@Pt/C core-shell structure cathode catalyst
ActiveCN105633425AEasy to prepareSolve resource problemsMaterial nanotechnologyCell electrodesPrimary cellAniline
The invention discloses a Pdx@Pt / C core-shell structure cathode catalyst for a fuel cell and a preparation method of the Pdx@Pt / C core-shell structure cathode catalyst. The method comprises the following steps: (1) adding a palladium precursor and a conductive carrier to N,N-dimethyl formamide or ethanol, carrying out ultrasonic mixing, and then adding borane.N,N-diethyl aniline or sodium borohydride, reacting at a room temperature for 0.5-1.5h, carrying out centrifugal washing and vacuum drying and then obtaining a carbon-supported Pd catalyst, namely Pd / C; and (2) ultrasonically dispersing the Pd / C prepared in the step (1) into a formic acid solution with the concentration of 1-5ml formic acid / 20ml water, adding a water solution of a platinum compound at the atomic ratio of Pt to Pd being 1 to 1 or 1 to 2 or 1 to 3, reacting at the room temperature for 2-6h, and carrying out centrifugal washing and vacuum drying to obtain the product. The catalyst with high catalytic activity and stability is prepared by a primary cell reaction principle; the catalyst is lower than a pure Pt catalyst in cost; the preparation method is simple, convenient, mild in condition and easy to operate; and the problem that a high temperature and a surfactant are required for preparation of the core-shell structure catalyst by a conventional chemical reduction method is solved.
Owner:WUHAN UNIV
Pd@PtNi/C metal nano-catalyst, and preparation method and use thereof
ActiveCN104368357AIncrease profitMild conditionsMaterial nanotechnologyCell electrodesNano catalystCitrinin hydrate
The invention discloses a Pd@PtNi nano-crystal with an octahedral core-shell structure, and a preparation method thereof for the first time. The preparation method of the crystal comprises the following steps: adding an octahedral Pd nanocrystal and hydrazine hydrate to an aqueous solution of PVP and citric acid monohydrate, injecting the obtained solution to a K2PtCl4 and NiCl2.6H2O mixed aqueous solution, heating, and stirring to obtain the Pd@PtNi nano-crystal with an octahedral core-shell structure. The invention also discloses a Pd@PtNi / C metal nano-catalyst, and a preparation method and a use thereof. The preparation method of the Pd@PtNi / C metal nano-catalyst comprises the following steps: injecting carbon black into the Pd@PtNi nanocrystal, carrying out ultrasonic treatment, washing, and drying to obtain the nano-catalyst. The nano-catalyst can be used in the fuel cell cathode oxygen reduction reaction process. The preparation method of the Pd@PtNi nanocrystal has mild and fast reaction, and the obtained Pd@PtNi nanocrystal has the advantages of uniform dimension, good dispersibility, enhancement of the utilization rate of Pt atoms, and enhancement of the catalytic activity on the fuel cell cathode oxygen reduction reaction.
Owner:UNIV OF SCI & TECH OF CHINA
Composite oxide carbon carrier-loaded nano Pt catalyst and preparation method and application thereof
ActiveCN106505214AImprove hydrophilicityImprove conductivityMaterial nanotechnologyCell electrodesHigh surfaceComposite oxide
The invention discloses a Pt-based fuel cell cathode catalyst of a transition metal element doped with TiO2 and a carbon compound with high specific surface area as a carrier, and a preparation method of the Pt-based fuel cell cathode catalyst. The method comprises the steps of adding a Ti compound and a transition metal M precursor to water, adding carbon with high specific surface area, carrying out ultrasonic mixing evenly and then obtaining a composite oxide carbon carrier C-Ti<x>M<1-x>O<2> by using a hydrothermal method; and mixing a platinum compound water solution with the C-Ti<x>M<1-x>O<2> and obtaining a composite oxide carbon carrier-loaded nano Pt catalyst, namely a Pt / C-Ti<x>M<1-x>O<2> catalyst by adopting an impregnation method. Compared with commercial Pt / C, the prepared Pt / C-Ti<x>M<1-x>O<2> catalyst has higher catalytic activity and stability due to interaction between a metal and the carrier; the preparation method is simple and convenient, mild in condition and easy to operate; the problems of high surface Pt agglomeration degree and poor stability of the catalyst prepared by adopting a conventional impregnation method are solved; and the composite oxide carbon carrier-loaded nano Pt catalyst is a powder catalyst suitable for a proton exchange membrane fuel cell.
Owner:WUHAN UNIV
PtRu/C catalyst and its preparation method
InactiveCN104209122AHigh activityImprove stabilityCell electrodesMetal/metal-oxides/metal-hydroxide catalystsRoom temperatureSodium borohydride
The invention provides a preparation method of a PtRu / C catalyst, and belongs to the field of catalyst preparation methods. The method comprises the following steps: dispersing a carbon carrier in water to obtain a first suspension; adding a chloroplatinic acid solution and a ruthenium chloride solution to the first suspension to obtain a second suspension; and pouring the second suspension into a sodium borohydride solution, and stirring at room temperature to obtain the PtRu / C catalyst. The invention also provides the PtRu / C catalyst. The PtRu / C catalyst has the characteristics of small particle size, uniform dispersion, and good methanol electrooxidation reaction catalysis performance. Experiments show that when the capacity of the PtRu / C catalyst prepared through the method is 30wt%, the mass activity of the catalyst in a methanol solution with sulfuric acid as an electrolyte reaches 447mA / mg, and is 1 time higher than the mass activity of commercial PtRu / C catalysts.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Preparation method and application of iridium oxide nanoparticle catalyst
ActiveCN111375408ASmall particle sizeLarge electrochemical active areaMaterial nanotechnologyRuthenium/rhodium/palladium/osmium/iridium/platinum oxides/hydroxidesPtru catalystPlasma generator
The invention discloses a preparation method and application of an iridium oxide nanoparticle catalyst. A mixed solution containing a polymer and an iridium-containing compound is uniformly applied toa treated conductive substrate; calcining in an air atmosphere is carried out to convert the iridium-containing compound into iridium oxide and the polymer is decomposed at the same time; the iridiumoxide nanoparticle material which is small in particle size, amorphous and of a porous structure is obtained, polymers remaining on the iridium oxide nanoparticle material are removed through a plasma generator, and the surfaces of iridium oxide nanoparticles are rich in hydroxyl. The film formed by the polymer in the mixed solution is utilized to solve the problem that the iridium-containing compound is agglomerated to form large particles when being calcined to generate the iridium oxide nanoparticles, thereby obtaining the small-particle-size iridium oxide nanoparticles. Besides, the plasma generator is used for removing residual polymers in the calcining process, the contact area of the iridium oxide nano particles is increased, and therefore the catalytic efficiency of the iridium oxide nano particles is improved.
Owner:MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
Metal material for proton exchange membrane fuel cell cathode catalyst and preparation method thereof
The invention provides a metal material for a proton exchange membrane fuel cell cathode catalyst. An alloy formed by platinum and gallium has a one-dimensional nanowire structure having the length of40-80nm and the diameter of 1-2nm, is provide. The invention also provides a preparation method of the metal material. Firstly Pt nanowires are obtained by reduction of the divalent metal platinum under the organic liquid condition, and a trivalent metal gallium compound and a reducing agent are added into the Pt nanowires and the alloy of Pt and Ga with the one-dimensional nanowire structure isobtained through reduction reaction. The structure of the Pt-Ga alloy material is the one-dimensional nanowire structure, the mass activity of the catalyst supported by carbon is more than nine timesof that of the Platinum-carbon nano-catalyst, the area activity of the catalyst is more than seven times than that of the Platinum-carbon nano-catalyst and the mass activity performance loss of the catalyst is only 15.7% when it is recycled 30000 times in oxygen atmosphere. Besides, the preparation method can realize high content doping of Ga element to Pt nanowires and the content is controllable, the use of the Pt element can be effectively reduced according to the requirements and the battery cost can be reduced; meanwhile, the reaction condition is mild and operation is simple.
Owner:HUNAN UNIV
Noble metal catalyst with activated carbon confinement and preparation method and application thereof
InactiveCN110380069AHigh catalytic activityImprove stabilityMaterial nanotechnologyCell electrodesAlloyOxygen
The invention provides a preparation method of a noble metal catalyst with activated carbon confinement. According to the invention, clusters containing metal salt and ligands are enabled to be easilyadsorbed by conductive carbon black by utilizing the amphipathicity of organic small-molecule ligands and the complexation thereof for noble metals and alloy ions. The metal salt clusters adsorbed bythe conductive carbon black holes form a confined space, and small particles are formed in the calcining process, so that further agglomeration cannot be carried out, and thus the 2-5nm noble metal and intermetallic nanoparticles thereof can be synthesized. The confined space further enhances the local concentration of the reaction substrate so as to acquire high catalytic activity for oxygen reduction in a fuel cell. In addition, the formation of the confined space and the experimental synthesis means of high-temperature calcination greatly improve the stability of the catalyst. Furthermore,the invention has the advantages of simple process route, simple synthesis equipment and low cost, and is applicable to large-scale industrial production.
Owner:UNIV OF SCI & TECH OF CHINA
Ligand-protected Pt6 sub-nanocluster and preparation method thereof, and catalyst and preparation method and application thereof
ActiveCN112599801AHigh quality activityImprove stabilityCell electrodesFuel cellsPtru catalystCombinatorial chemistry
The invention relates to the technical field of electrochemistry and provides a ligand-protected Pt6 sub-nanocluster and a preparation method thereof, and a catalyst and a preparation method and application thereof. According to the method, a phosphine compound is used as a ligand, a weakly polar solvent with the polarity value of 1-5 is used as a solvent of the ligand, an amine complex is used asa reducing agent, the number of Pt atoms in the cluster is accurately controlled under the cooperation of the phosphine compound, the weakly polar solvent and the amine complex, and synthesis of thePt6 sub-nanocluster is achieved. The carbon-loaded Pt6 sub-nanocluster catalyst provided by the invention comprises a carbon carrier and a ligand-protected Pt6 sub-nanocluster loaded on the carbon carrier, and under the protection of the ligand, the Pt6 sub-nanocluster can stably exist and is not easy to agglomerate in the catalytic process; the carbon-supported Pt6 sub-nanocluster catalyst provided by the invention has ultrahigh quality activity and good stability for hydrogen oxidation reaction, the quality activity and durability of the catalyst are higher than those of a commercial Pt / C catalyst, and the catalyst has a wide application prospect.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA) +1
A kind of preparation method of proton exchange membrane fuel cell catalyst
ActiveCN103285880BReduce contentSolve resource problemsCell electrodesMetal/metal-oxides/metal-hydroxide catalystsNanoparticleProton
The invention discloses a preparation method of a proton exchange membrane fuel battery catalyst. The novel fuel battery catalyst of a core-shell structure consists of a conductive carrier and ternary core-shell structured nano grains; and the preparation method comprises the following steps of: step one, preparing Co particles by reducing CoCl2.6H2O, namely, adding a PVP (Polyvinyl Pyrrolidone) ethanol solution into an ethanol solution of CoCl2 to be used as a stabilizer, and slowly adding a NaBH4 ethanol solution under stirring so as to carry out reduction to prepare the Co particles; step two, preparing Co@Ru core-shell type nano grains by reducing RuCl3 and a Co particle suspension solution by using ethylene glycol; and step three, preparing a ternary core-shell Co-Ru@Pt / C catalyst by further reducing H2PtCl6, the Co@Ru core-shell type nano grains and the mixed suspension solution by using ethylene glycol. The catalyst has the advantages of low Pt capacity and high catalysis activity.
Owner:ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
Iridium-based multi-component nano-porous catalyst as well as preparation method and application thereof
ActiveCN114540836ALower overpotentialHigh quality activityNanotechnologyElectrodesPtru catalystElectrolysis
The invention provides an iridium-based multi-component nano-porous catalyst as well as a preparation method and application thereof, belongs to the technical field of catalytic materials, and solves the defects of low anode electrolysis efficiency, large use amount of noble metal in the catalyst and relatively high cost of a water electrolysis hydrogen production catalyst in the prior art. The iridium-based multi-element composite nano-porous catalyst comprises iridium and / or iridium oxide and further comprises an oxide compounded with the iridium and / or iridium oxide, the oxide has conductivity, and the dielectric constant of the oxide is smaller than 80 F / m. The catalyst provided by the invention has low overpotential and high mass activity, the use amount of precious metal iridium can be reduced, and the energy consumed by oxygen evolution reaction is less.
Owner:CHINA THREE GORGES CORPORATION
Preparation method and application of palladium metal cluster catalyst
ActiveCN114849753AHigh activityLow costPhysical/chemical process catalystsHydrocarbon by hydrogenationNano catalystPtru catalyst
The invention relates to the field of metal cluster catalysts, and discloses a preparation method and application of a palladium metal cluster catalyst, the method comprises the following steps: S1, preparing a zeolite imidazole framework material ZIF8 through zinc nitrate and 2-methylimidazole, and annealing and heating the ZIF8 in Ar atmosphere to obtain a nitrogen-doped porous carbon material; s2, preparing a [Pd3Cl (PPh2) 2 (PPh3) 3] < + > [SbF6] <-> crystal as a reaction precursor by adopting a ligand-regulated liquid phase reduction method; and S3, dispersing the nitrogen-doped porous carbon in dichloromethane, dissolving the reaction precursor in dichloromethane, dropwise adding into the mixture, stirring, centrifuging, drying and separating out a supported sample, and annealing and heating in an Ar atmosphere to obtain the supported palladium metal cluster catalyst. According to the invention, the palladium metal cluster nano-catalyst with uniform dispersion and consistent morphology is prepared by a two-step annealing method, and the obtained catalyst shows excellent activity and selectivity on phenylacetylene hydrogenation reaction.
Owner:UNIV OF SCI & TECH OF CHINA
Nanocomposite catalyst and its preparation method and application
ActiveCN105312087BExcellent quality and activityHigh quality activityOrganic-compounds/hydrides/coordination-complexes catalystsCell electrodesFiberCarbon fibers
The invention discloses a nano-grade composition, a preparation method thereof, and an application thereof as an electrochemical catalyst. The nano-grade composition provided by the invention is basically composed of a melamine derivative, a carbon material, and transition metal or transition metal alloy nano-cluster. The carbon material comprises at least one selected from conductive carbon black, activated carbon, carbon nano-horn, N-doped carbon nano-horn, carbon nano-tube, graphene, graphite and carbon fiber material. The metal nano-cluster is at least one selected from Pt, Ru, Pd, Rh and Ir nano-clusters. The alloy nano-cluster is nano-cluster formed by more than two elements selected from Pt, Ru, Pd, Rh, Ir, Fe, Cu and Ni. The mass percentage content of the transition metal or alloy nano-cluster is 0.1-90%. The size of the transition metal or alloy nano-cluster is 0.5-10nm. As a fuel cell catalyst, the nano-grade composition provided by the invention has excellent electrocatalytic activity upon reactions such as oxygen reduction and methanol oxidation.
Owner:无锡盛鑫氢能科技有限公司
Transition metal doped anode catalyst as well as preparation method and application thereof
InactiveCN112002916AImprove catalytic performanceImprove stabilityMaterial nanotechnologyCell electrodesOrganic acidSulfuric acid
The invention provides a transition metal doped anode catalyst as well as a preparation method and application thereof. The method comprises the following steps: treating carbon nanotubes with acetoneand sulfuric acid to obtain pretreated carbon nanotubes; mixing an alcohol solvent, tetra-n-butyl titanate, a stabilizer, metal acetate and the pretreated carbon nanotube under an organic acid condition, heating to obtain a precursor, and roasting in an ammonia atmosphere to obtain TiMN / NCNTs, wherein M is a transition metal; depositing platinum on the TiMN / NCNTs by adopting a pulse electro-deposition method to obtain the TiMN-coated Pt / NCNTs. According to the anode catalyst prepared by the method, titanium nitride doped with transition metal is used as a core; a layer of platinum is deposited on titanium nitride doped with transition metal through a pulse electro-deposition method, the transition metal is introduced into the titanium nitride to adjust the surface electronic structure ofthe titanium nitride, the synergistic effect between the platinum and a nitride core is enhanced, and the catalytic performance is improved. Good stability and anti-poisoning capability are also realized.
Owner:GUANGDONG UNIV OF TECH
Preparation method and application of platinum-carbon quantum dot/multi-walled carbon nanotube composite material
PendingCN111905722AHER highHigh activityCatalyst activation/preparationElectrolytic organic productionPtru catalystElectrolysis
The invention provides a preparation method and application of a platinum-carbon quantum dot / multi-walled carbon nanotube composite material. According to the method, platinum nanoparticles (Pt NP) and carbon quantum dots (CQDs) are prepared in situ under the auxiliary action of an electric field, and the Pt NP and the CQDs are subjected to subsequent thermal adjustment in the process of loading the Pt NP and the tetrabutylammonium hydroxide (TBAOH) by controlling electrolytic voltages (30V, 20V, 10V and 5V) and electrolytes (tetrabutylammonium tetrafluoroborate (TBABF4), tetrafluoride (TBACF3SO3)) and tetrabutylammonium fluoride). Thus, the Pt-CQDs / MWCNT composite catalyst is obtained. The adopted synthesis process is simple, in-situ synthesis is adopted, the prepared platinum-carbon quantum dot / multi-walled nanotube composite material is an electrocatalyst, and the mass activity of a hydrogen evolution reaction (HER) and an ethanol oxidation reaction (EOR) of a PtCQDs / MWCNT catalystis 14.8 times higher than that of commercially available Pt / C (the overpotential is -40 mV) and 5.6 times higher than that of a front peak.
Owner:山西师范大学
Comment extension method and device
PendingCN111723548AGuaranteed to be heatedReduce labor costsDigital data information retrievalNatural language data processingEngineeringNetwork model
The invention provides a comment extension method and device, electronic equipment and a computer readable storage medium, and relates to the technical field of natural language processing. The methodcomprises the steps of obtaining to-be-extended source comments and source news corresponding to the source comments; inputting the source comments and the source news into a pre-trained neural network model to obtain a plurality of target comments for the source comments and the source news, wherein the neural network model is obtained by training according to training pairs including sample comments and sample news corresponding to the sample comments, and training results corresponding to the training pairs, and is used for expanding the sample comments. According to the method and device,a large number of relevant and diverse comments can be generated, and the high-quality activeness of source news topics is improved.
Owner:TENCENT TECH (SHENZHEN) CO LTD
Preparation method and application of fibronectin-functional cell composite type microencapsulation transplant
InactiveCN106963782AEliminate the risk of heterologous infectionPromote adhesionPeptide/protein ingredientsMetabolism disorderMicroencapsulationsTreatment effect
The invention relates to a preparation method and application of a fibronectin-functional cell composite type microencapsulation transplant. The method includes: selecting an adult or an SPF mammal as a functional cell donor, separating cells with specific functions from the adult or the SPF mammal, and purifying the separated cells; using an FN serum-free culture medium to perform in-vitro culture on the purified functional cells so as to obtain a large amount of high-quality active functional cells through amplification; using the microencapsulation immune isolation technology to jointly embed fibronectin and the functional cells into an APA micro-capsule according to a certain proportion so as to form the fibronectin-functional cell composite type microencapsulation transplant. The preparation method has the advantages that technical difficulties that high-quality active functional cells are insufficient, allosome or xenogeneic immunological rejection exists, the surviving period of transplanted functional cells in a receptor is short, the long-term treatment effect is poor, and the like in the current clinical application using cell transplanting to treat serious diseases such cardiovascular disease and diabetes can be solved, and a new technical manner and method using the cell transplanting to treat various serious diseases is provided.
Owner:王斌
Preparation method and device of novel two-dimensional configuration electrode
The invention discloses a preparation method and device of a novel two-dimensional configuration electrode. The preparation method comprises the following steps: arranging a preset electrode mask on the surface of a preset diaphragm; coating the surface of the diaphragm with preset electrode catalyst slurry for electrode processing; and removing the electrode mask from the surface, and generating a novel two-dimensional configuration electrode with a plane concave-convex configuration on the surface. By applying the method and the system, the novel two-dimensional configuration electrode is obtained in a simple, efficient, simple and convenient to operate and environment-friendly in preparation and processing process, the novel two-dimensional configuration electrode has the advantages of high performance, low cost, long service life and the like, meanwhile, the edge effect of the electrode is fully utilized, and the application prospect is wide. And the performance is ensured, and the catalyst loading capacity is reduced at the same time.
Owner:HAINAN UNIVERSITY +2
Ultrafine ptrh nanowire and its catalyst preparation method and application
ActiveCN106925771BAtom utilization is highImprove activity stabilityMaterial nanotechnologyTransportation and packagingNano catalystNanowire
The invention discloses an ultrafine PtRh nanowire, wherein Rh atoms are uniformly doped in the Pt ultrafine nanowire. The invention also discloses a preparation method of the ultrafine PtRh nano wire. The invention also discloses a PtRh / C metal nanometer catalyst. The invention also discloses a preparation method of the above-mentioned PtRh / C metal nano catalyst. The invention also discloses the application of the above-mentioned PtRh / C metal nano-catalyst as a catalyst in the fuel cell cathode oxygen reduction reaction process. The nano crystal obtained by the invention has uniform size, good dispersion, good stability and high catalytic activity.
Owner:INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
A ligand protects pt 6 Sub-nano cluster and its preparation method as well as a catalyst and its preparation method and application
ActiveCN112599801BHigh quality activityImprove stabilityCell electrodesFuel cellsPtru catalystCombinatorial chemistry
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA) +1
A high-efficiency doping method for doped nbox platinum-based catalysts for fuel cell catalysts
ActiveCN106334553BImprove physical and chemical propertiesImprove conductivityCell electrodesMetal/metal-oxides/metal-hydroxide catalystsFuel cellsFiltration
The invention discloses a high-efficiency doping method of a doped NbOx platinum-based catalyst used for fuel cell catalysts, and relates to a preparation method of doped NbOx powder. The purpose of the invention is to solve the problems of low conductivity and poor catalysis activity of present NbOx oxides. The method comprises the following steps: 1, preparing a precursor; 2, roasting; 3, doping; and 4, adjusting the pH value of a reaction solution III, carrying out suction filtration, cleaning, and drying to obtain the doped NbOx platinum-based catalyst used for fuel cell catalysts. The half-wave potential of the doped NbOx platinum-based catalyst used for fuel cell catalysts, prepared in the invention, is 0.79-0.86 V, and is more positive than that of a carbon supported platinum catalyst, and the mass activity of the doped NbOx platinum-based catalyst is high, can reach 173.44 mAmgPt<-1> and is 2.96-5.3 times higher than that of the carbon supported platinum catalyst. The doped NbOx platinum-based catalyst used for fuel cell catalysts can be obtained through the high-efficiency doping method.
Owner:HARBIN INST OF TECH
A kind of preparation method and application of iridium oxide nanoparticle catalyst
ActiveCN111375408BSmall particle sizeLarge electrochemical active areaMaterial nanotechnologyRuthenium/rhodium/palladium/osmium/iridium/platinum oxides/hydroxidesAir atmospherePtru catalyst
Owner:MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
Catalyst
PendingCN112042023AHigh quality activityIncrease the areaCell electrodesCatalyst activation/preparationPtru catalystFuel cells
Provided is a catalysts comprising a Ta layer having an outer layer with a layer comprising Pt directly thereon, wherein the Ta layer has an average thickness in a range from 0.04 to 30 nanometers, wherein the layer comprising Pt has an average thickness in a range from 0.04 to 50 nanometers, and wherein the Pt and Ta are present in an atomic ratio in a range from 0.01:1 to 10:1. Catalyst described herein are useful, for example, in fuel cell membrane electrode assemblies.
Owner:3M INNOVATIVE PROPERTIES CO
Pt-Au@Pt core-shell structure fuel cell cathode catalyst and preparation method thereof
InactiveCN103084175BSolve resource problemsAbundant resourcesCell electrodesMetal/metal-oxides/metal-hydroxide catalystsFuel cellsCore shell
The invention discloses a Pt-Au@Pt core-shell structure fuel cell cathode catalyst and a preparation method thereof. The Pt-Au@Pt core-shell structure fuel cell cathode catalyst consists of a conductive carrier and Pt-Au@Pt core-shell structure nanoparticles. The preparation method comprises the following steps of: reducing a gold compound by using sodium borohydride to obtain Au nanoparticles, and loading the Au particles on the surface of a carbon carrier to obtain Au / C; and putting Au / C in a platinum compound water solution to obtain loaded-type Pt / Au alloy nanoparticles after Pt is subjected to spontaneous reductive deposition on the Au surface, depositing a Cu atom monolayer on the surface of the Pt-Au alloy nanoparticles by using an underpotential deposition method and then displacing the Cu atom monolayer with Pt to obtain the Pt-Au@Pt core-shell structure fuel cell cathode catalyst. The catalyst prepared by using the preparation method disclosed by the invention is high in catalytic activity and stability and low in cost relative to a pure Pt catalyst; and the preparation method is simple and convenient, mild in condition and easy to operate and can be used for solving the problem that a core-shell structure catalyst prepared by using a conventional chemical reduction method is high in Pt agglomeration degree on the surface and a catalyst prepared by using a single underpotential deposition method is low in Pt coverage degree on the surface.
Owner:WUHAN UNIV
Nano-catalyst for electrochemical preparation of hydrogen peroxide, and preparation method and application thereof
InactiveCN111617775AMany catalytically active sitesTuning the electrochemical properties of the surfaceTransportation and packagingMetal-working apparatusNano catalystPtru catalyst
The invention provides a nano-catalyst for electrochemical preparation of hydrogen peroxide, and a preparation method and application of the nano-catalyst. The preparation method comprises the following steps: preparing a seed solution; preparing a growth solution; preparing gold nanoparticles; preparing gold-platinum nanometer particles; and preparing the nano-catalyst for electrochemical preparation of hydrogen peroxide. The catalyst prepared by the preparation method provided by the invention can be used for catalyzing a reaction for electrochemical preparation of hydrogen peroxide, and theselectivity of hydrogen peroxide is 95% or above.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Cathode catalyst active material for hydrogen fuel cell, preparation method and catalyst
ActiveCN112054219BInhibit sheddingIncrease profitMaterial nanotechnologyCell electrodesNanowirePtru catalyst
The invention provides a cathode catalyst active material for a hydrogen fuel cell, a one-dimensional PtNiGaRe quaternary alloy nanowire formed by Pt, Ni, Ga and Re metal elements; and a one-dimensional PtNiGaRe quaternary alloy nanowire loaded on carbon A cathode catalyst for a hydrogen fuel cell can be obtained. Also provided is a preparation method of a quaternary alloy nanowire, which comprises dispersing Pt-containing salt, Ni-containing salt, Ga-containing salt, perrhenate and quaternary ammonium salt containing hexadecyltrimethyl molecular chain In oleylamine, ultrasonication forms a homogeneous system, and then adds W(CO) 6 Adding it into the above system at a certain temperature, reacting for a certain period of time, and then centrifuging and cleaning to obtain one-dimensional ultrafine PtNiGaRe nanowires. The quaternary one-dimensional alloy nanowire material of the present invention is a brand-new quaternary alloy catalytic system, which not only increases the utilization rate of platinum atoms on the surface, but also improves the activity and stability of the catalyst. The invention adopts the wet chemical method for the first time to synthesize the alloy nanowires of four metals in one step, not only the operation is simple, but also the reaction conditions are relatively mild, and the use of Pt can be greatly reduced.
Owner:HUNAN UNIV
A kind of hydrogen evolution electrocatalyst and its preparation method and application
The invention discloses a hydrogen evolution electrocatalyst and its preparation method and application. The catalyst includes a composite material doped with Co and Pt double single atoms, and both Co and Pt in the composite material exist in the form of single atoms, wherein, The Co active site contains Co-N coordination, and the Pt active site contains Pt-N / C coordination. The preparation method comprises: preparing a transition metal-doped carbon carrier; making the carbon carrier physically adsorb platinum ions; reducing the platinum by using an electrochemical reduction method, and the platinum and cobalt in the obtained catalyst both exist in the form of single atoms. Both Co and Pt in the catalyst of the present invention exist in the form of single atoms and contain two kinds of active sites; the carbon carrier doped with transition metals has a large specific surface area and many defects have a strong ability to anchor platinum single atoms; the obtained single The atomic catalyst has excellent hydrogen evolution activity, and the preparation method is mild and simple, which can be applied in electrolysis of water.
Owner:NANJING UNIV
Graphene-polypyrrole/platinum nano modified glassy carbon electrode, preparation method for same and application thereof
InactiveCN102361087BImprove electrical activityLarge electroactive areaCell electrodesPtru catalystFuel cells
The invention discloses a graphene-polypyrrole / platinum nano modified glassy carbon electrode and a preparation method for the same. The preparation method particularly includes the steps of polishing a glassy carbon electrode, and preparing a grapheme modified glassy carbon electrode, a graphene-polypyrrole modified glassy carbon electrode and the graphene-polypyrrole / platinum nano modified glassy carbon electrode. The obtained graphene-polypyrrole / platinum nano modified glassy carbon electrode is used as a catalyst for methanol oxidation in a methanol fuel cell. The graphene-polypyrrole / platinum nano modified glassy carbon electrode has the advantages of high dispersion, high catalytic activity and high anti-toxicity.
Owner:NORTHWEST NORMAL UNIVERSITY
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