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42results about How to "Increase ORR activity" patented technology
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Co@NC high-dispersion core-shell structure catalyst, and preparation method and application of catalyst
InactiveCN110176606AImprove stabilityHigh resistance to methanolMaterial nanotechnologyPhysical/chemical process catalystsCvd grapheneDecomposition
The invention discloses a Co@NC high-dispersion core-shell structure catalyst, and a preparation method and an application of the catalyst, and belongs to the technical field of energy source materials and electrochemistry. The preparation method of the catalyst comprises the steps of taking glucose as a C source, taking cyanoguanidine as a C-N source, taking Co(No3).6H2O as a Co source, and performing high temperature calcination. The cyanoguanidine performs high temperature decomposition to generate two-dimensional flaky g-C3N4; the glucose performs high temperature decomposition to generatea carbon intermediate and a metal species which are inserted into flakes of g-C3N4; and Co nanoparticles coated by an N-C layer in the catalyst are uniformly dispersed on a graphene carbon layer. Thecatalyst can serve as a cathode oxygen reduction electrocatalyst of a metal-air battery and a fuel battery. The catalyst is cheap and easy obtaining in raw material, and simple in preparation technology; amplification production is facilitated; in-situ decomposition of the cyanoguanidine provides rich N doped active sites for the catalyst; rich mesoporous structures are formed; the activity of the catalyst is improved; a channel is provided for transfer and transport of reaction participation substances in an ORR process; a mass transfer demand of a reaction process is met; and the catalyst is good in stability and high in methanol resistance.
Owner:DALIAN UNIV OF TECH
Nitrogen-doped carbon-supported monoatomic oxygen reduction catalyst and preparation method thereof
ActiveCN109841854ALarge specific surface areaHigh porosityCell electrodesBiological activationNitrogen doped
The invention relates to a nitrogen-doped carbon-supported monoatomic oxygen reduction catalyst and a preparation method thereof, and belongs to the technical field of electrocatalytic materials. Themethod is characterized in that a composite of a Zn-based bimetallic MOF and glucose is used as a precursor, the catalyst is obtained by high-temperature heat treatment and post-activation in ammoniagas, the monoatomic content is 2wt% to 4wt%, and the nitrogen doping amount is 4wt% to 15wt%. The addition of volatile Zn can increase the spatial distance of metal atomic nodes, the glucose can makea three-dimensional ZIF form a cross-linked structure, the structure and composition of a modulating material can improve the electrocatalytic activity, the nitrogen content can be further increased by post-activation treatment in the ammonia gas, and therefore, the electrochemical activity is improved. At the same time, the preparation method has the advantages of low cost, simple steps, mild conditions, good repeatability and easy mass production. The monoatomic catalyst exhibits good performance in an electrocatalytic oxygen reduction reaction (ORR) under an alkaline condition and has certain market application prospects.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Non-platinum bimetallic polymer electrolyte fuel cell catalysts
ActiveUS20090192030A1Low costPromote formationCell electrodesCatalyst activation/preparationNon platinumAlloy
A polymetallic nanoparticle alloy having enhanced catalytic properties including at least one noble metal and at least one base metal, where the noble metal is preferentially dispersed near the surface of the nanoparticle and the base metal modifies the electronic properties of the surface disposed noble metal. The polymetallic nanoparticles having application as a catalyst when dispersed on a carbon substrate and in particular applications in a fuel cell. In various embodiments a bimetallic noble metal-base metal nanoparticle alloy may be used as an electrocatalyst offering enhanced ORR activity compared to the monometallic electrocatalyst of noble metal.
Owner:UCHICAGO ARGONNE LLC
Preparation method for nitrogen-boron-doped carbon-based catalyst
ActiveCN104998675AOxygen reduction activity and good stabilitySimple processPhysical/chemical process catalystsCell electrodesDoped carbonMetallurgy
The invention discloses a preparation method for a nitrogen-boron-doped carbon-based catalyst, which belongs to the technical field of catalytic materials. The method comprises the following steps: pretreating a carbon material; then mixing the pretreated carbon material with a nitrogen supplying agent, a boron supplying agent and an activator and carrying out mechanical ball milling; then subjecting a mixture obtained after ball milling to nitrogen-boron co-penetration heat treatment of the carbon material at a temperature of 500 to 1100 DEG C under the protection of inert gas for 1 to 3 h; and finally carrying out pickling so as to prepare the nitrogen-boron-doped carbon-based catalyst. The nitrogen-boron-doped carbon-based catalyst prepared by using the method can be used as a negative electrode oxygen reducing catalyst for a fuel cell; the preparation method has the advantages of low prices of raw materials, simple process, low requirements on equipment and applicability to large-scale production of the catalyst; and the catalyst shows good oxygen reduction activity and stability under both acidic and alkaline conditions.
Owner:KUNMING UNIV OF SCI & TECH
FeCx@NC core-shell structured catalyst and preparation method therefor
The invention relates to a FeCx@NC core-shell structured catalyst and a preparation method therefor. The FeCx@NC core-shell structured catalyst takes iron and FeCx nanoparticle mixture as the core, and takes nitrogen and FeCx-doped carbon as the shell, and has a mesoporous structure with a specific surface area of 500-900m<2>g<-1>. The preparation method for the core-shell structured catalyst comprises the steps of preparing a polyaniline and glucose composite material firstly; performing calcining for one time to prepare a Fe-N-C catalyst; and finally performing calcining for the second time to obtain the FeCx@NC catalyst. The catalyst is high in oxygen reduction activity and high in stability; the raw materials, such as the carbon source and the nitrogen source used by the preparation method are low in cost, so that the production cost for producing a Fe-N-C material by the conventional pyrolysis method can be lowered; meanwhile, the preparation method is simple and easy to implement; and in addition, the core-shell structured catalyst provided by the invention has relatively high electrocatalytic activity, and can be widely applied to the negative electrode catalyst of a proton exchange membrane fuel cell, an alkali negative ion exchange membrane fuel cell, and a metal air battery.
Owner:DALIAN UNIV OF TECH
Method for preparing high-performance carbon catalyst
The invention relates to a method for preparing a high-performance carbon catalyst, and belongs to the technical field of new energy materials. The method comprises the following steps: firstly, carrying out coordination on aniline and a transition metal salt to prepare a suspension liquid; secondly, filtering the prepared suspension liquid to obtain a filter cake, soaking the filter cake with a mixed solution of one or more of ethanol, water, acetone, diethyl ether, methyl alcohol and formaldehyde at any ratio for 15-120 minutes, cleaning the filter cake and then carrying out suction filtration, drying and grinding to obtain a nano dentate polyaniline metal coordination polymer; and finally carrying out thermal treatment on the obtained nano dentate polyaniline metal coordination polymer to prepare the high-performance carbon catalyst under an atmosphere condition. A non-noble metal carbon catalyst prepared by the method is low in price of used raw materials, simple in preparation technology, low in equipment requirement and suitable for large-scale production of the catalyst.
Owner:KUNMING UNIV OF SCI & TECH
Preparation method of monodisperse platinum-series high-entropy alloy nanoparticle catalyst
ActiveCN111111693AHigh Pt utilizationEasy to prepareMetal/metal-oxides/metal-hydroxide catalystsPtru catalystHigh entropy alloys
The invention relates to the technical field of material chemistry, and particularly discloses a preparation method of a monodisperse platinum-series high-entropy alloy nanoparticle catalyst. The preparation method comprises the steps: preparing a silicon dioxide photonic crystal template, preparing a carbon precursor solution, and dissolving a platinum precursor and at least four other metal precursors in THF and CHCl3 to obtain a mixed solution; mixing a block copolymer F127, a carbon precursor solution and tetraethyl orthosilicate, respectively adding the mixture and a protonic acid solution into the mixed solution, and stirring to obtain a transparent solution; adding the transparent solution into the silicon dioxide photonic crystal template, drying, heating and curing to obtain a purple brown solid; calcining the purple brown solid to obtain a gray solid; and etching the gray solid by adopting strong base or strong acid, filtering and drying. The monodisperse platinum-series high-entropy alloy nanoparticle catalyst with the advantages of controllable particle size, good dispersity, excellent performance and the like is obtained by adopting the preparation method disclosed bythe invention.
Owner:CHONGQING UNIV
Non-platinum bimetallic polymer electrolyte fuel cell catalysts
ActiveUS8129306B2Low costPromote formationCell electrodesCatalyst activation/preparationNon platinumAlloy
A polymetallic nanoparticle alloy having enhanced catalytic properties including at least one noble metal and at least one base metal, where the noble metal is preferentially dispersed near the surface of the nanoparticle and the base metal modifies the electronic properties of the surface disposed noble metal. The polymetallic nanoparticles having application as a catalyst when dispersed on a carbon substrate and in particular applications in a fuel cell. In various embodiments a bimetallic noble metal-base metal nanoparticle alloy may be used as an electrocatalyst offering enhanced ORR activity compared to the monometallic electrocatalyst of noble metal.
Owner:UCHICAGO ARGONNE LLC
Cathode electrode for fuel cell
ActiveUS20150030966A1Limit performanceEnhanced ORR activityActive material electrodesSolid electrolyte fuel cellsChemistryPeak value
A cathode electrode for a fuel cell, includes a conductive carrier having pores and a catalyst having a platinum alloy supported in the pores of the conductive carrier, wherein the catalyst has in a pore diameter range of 2 to 6 nm when diameters of the pores is plotted in relation with volumes of the pores a peak value of more than 1 cm3 / g and also a BET specific surface area of 1300 m2 / g.
Owner:NISSAN MOTOR CO LTD
Negative expansion material compounded cobalt-based perovskite material, preparation method and solid oxide fuel cell
ActiveCN113381027AImprove electrochemical performanceLow thermal expansionCell electrodesFinal product manufactureComposite electrodeFuel cells
The invention relates to a negative expansion material compounded cobalt-based perovskite material, a preparation method and a solid oxide fuel cell, and belongs to the technical field of fuel cells. According to the invention, the negative expansion material is introduced into the cobalt-based perovskite oxide, so that the SOFC cathode material with good electrochemical performance and low thermal expansion is successfully prepared. A composite electrode achieves good mechanical tolerance in the SOFC, the volume change in the whole sintering process can be relieved, the composite electrode is stably transited to a high-temperature stage, the TEC of the composite electrode is only 12.9 * 10 <-6 > K <-1 >, and the composite electrode is completely matched with an SDC electrolyte; in addition, the composite material shows good ORR activity and TEC value, and meanwhile, the CO2 poisoning resistance of the composite material is very excellent.
Owner:NANJING TECH UNIV
Co atom-doped polyhedral MOFs (Metal-Organic Frameworks) material as well as preparation method and application thereof
InactiveCN113410481AImprove isolationAvoid reunionFuel and secondary cellsOther chemical processesPtru catalystPhysical chemistry
The invention provides a Co atom-doped polyhedral MOFs (Metal-Organic Frameworks) material as well as a preparation method and application thereof. The preparation method of the Co atom-doped polyhedral MOFs material comprises the following steps: adding dimethylimidazole, a zinc salt and a cobalt salt into a methanol solution to carry out a precursor synthesis reaction, and separating and drying a reaction product to obtain precursor powder; subjecting dicyandiamide to roasting treatment, and preparing g-C3N4 powder; grinding and uniformly mixing the precursor powder and the g-C3N4 powder to obtain mixed powder, and calcining the mixed powder in an inert atmosphere; subjecting a product obtained after calcination treatment to acid pickling with sulfuric acid, conducting solid-liquid separation, then drying, and obtaining the Co atom doped polyhedral MOFs material. The Co atom-doped polyhedral MOFs material prepared by the preparation method disclosed by the invention is relatively high in nitrogen content and relatively large in specific surface area, can be used as an electro-catalytic material of a zinc-air battery, and has more excellent electro-catalytic activity than a commercial 40% Pt / C catalyst.
Owner:ZHEJIANG UNIV OF TECH
High-activity Co-Ni-Fe co-inlaid non-noble metal catalyst as well as preparation method and application thereof
InactiveCN112691688AHigh activityThere will be no reunionCell electrodesMetal/metal-oxides/metal-hydroxide catalystsPtru catalystMetallurgy
The invention provides a high-activity Co-Ni-Fe co-inlaid non-noble metal catalyst as well as a preparation method and application thereof. Based on a preparation method of an organic metal framework compound, the high-activity Co-Ni-Fe co-inlaid non-noble metal catalyst is synthesized by optimizing the contents of Co, Ni and Fe. The multi-metal inlaid catalyst has three active sites of Co-N-C, Ni-N-C and Fe-N-C, and after optimization, the Co-Ni-Fe co-inlaid non-noble metal catalyst has no metal agglomeration phenomenon. Besides, due to rich active sites, the catalyst shows excellent electrochemical activity, the half-wave potential in a 0.1 M KOH solution is as high as 0.881 V (vs.RHE), and the half-wave potential in a 0.1 M HCLO4 solution is as high as 0.798 V (vs.RHE), which are far superior to those of a conventional non-noble metal catalyst. The catalyst has a huge application prospect in the aspect of effectively reducing the cost of the proton exchange membrane fuel cell.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Supported platinum-palladium-gold ternary alloy nano-catalyst as well as preparation method and application thereof
The invention discloses a supported platinum-palladium-gold ternary alloy nano-catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: S01, measuring a proper amount of HCl solution of PdCl2 in a beaker, slowly adding a certain amount of ammonia water under stirring conditions until the system is colorless, and continuously stirring for at least 30 minutes for later use; S02, weighing a certain amount of pretreated carbon support in another beaker, adding a proper amount of aqueous solution of H2PtCl6 and H2AuCl6, and uniformly dispersing in a low-temperature ultrasonic machine; S03, adding the solution in S01 into the beaker in S02, and uniformly dispersing at room temperature so as to obtain carbon mud; and S04, stirring and evaporating the carbon mud in S03 until obvious liquid does not exist in the carbon mud. The method is easy to operate, does not have any surfactant and is free from pollution and environmentally friendly, and the catalyst prepared by the method is stable in performance and high in repeatability and can be produced in batches.
Owner:KUSN INNOVATION INST OF NANJING UNIV +1
Electrode catalyst
InactiveUS20160104897A1Increase ORR activityHigh oxygen dissociation capacityFuel and primary cellsHeterogenous catalyst chemical elementsMetal catalystManganese
An electrode catalyst includes a carbon (C) carrier; a perovskite-type oxide catalyst containing lanthanum (La), manganese (Mn), and oxygen (O) elements; and a metal catalyst containing a silver (Ag) element. The perovskite-type oxide catalyst is located on the carrier and the metal catalyst is also located on the carrier.
Owner:TOYOTA JIDOSHA KK
Iridium monatomic catalyst and preparation method and application thereof
ActiveCN112892571AExcellent oxygen reduction activityIncreased oxygen reduction activityFuel and secondary cellsMicrobiological testing/measurementIridiumPhotochemistry
The invention discloses an iridium monatomic catalyst and a preparation method and application thereof, the catalyst is a nanostructure system, carbon atoms, nitrogen atoms and iridium atoms are distributed in the nanostructure system, in the nanostructure system, the carbon atoms form a carrier structure, and the iridium atoms and the nitrogen atoms are embedded in the carrier structure. After the prepared catalyst is applied, the problems that an energy supply system in a self-energy-supply sensing system is poor in stability and low in glucose detection sensitivity can be solved.
Owner:HUAZHONG NORMAL UNIV
A kind of preparation method of nitrogen-boron doped carbon-based catalyst
ActiveCN104998675BIncrease ORR activityImprove stabilityPhysical/chemical process catalystsCell electrodesFuel cellsNitrogen
The invention discloses a preparation method for a nitrogen-boron-doped carbon-based catalyst, which belongs to the technical field of catalytic materials. The method comprises the following steps: pretreating a carbon material; then mixing the pretreated carbon material with a nitrogen supplying agent, a boron supplying agent and an activator and carrying out mechanical ball milling; then subjecting a mixture obtained after ball milling to nitrogen-boron co-penetration heat treatment of the carbon material at a temperature of 500 to 1100 DEG C under the protection of inert gas for 1 to 3 h; and finally carrying out pickling so as to prepare the nitrogen-boron-doped carbon-based catalyst. The nitrogen-boron-doped carbon-based catalyst prepared by using the method can be used as a negative electrode oxygen reducing catalyst for a fuel cell; the preparation method has the advantages of low prices of raw materials, simple process, low requirements on equipment and applicability to large-scale production of the catalyst; and the catalyst shows good oxygen reduction activity and stability under both acidic and alkaline conditions.
Owner:KUNMING UNIV OF SCI & TECH
Fuel cell catalyst with high-density active sites and preparation method thereof
The invention relates to a fuel cell oxygen reduction catalyst with high-density active sites and a preparation method thereof, the catalyst is composed of specially designed high-density Fe-Nx-C and platinum nanoparticles loaded on the Fe-Nx-C, and the catalyst is characterized in that the high-density Fe-Nx active sites are not mutually agglomerated; however, the Fe-Nx-C substrate with a special structure has very good oxygen reduction activity, and a small amount of nano platinum particles loaded on the Fe-Nx-C substrate can fully exert the activity of the Fe-Nx-C substrate due to the synergistic effect of a carrier and metal instead of regional intensive active sites under the action of thermal coupling. According to the method, the problem of insufficient performance of a traditional carbon substrate is solved to a certain extent, the use amount of platinum is reduced, and the fuel cell oxygen reduction catalyst has a good prospect in practical application of the low-temperature hydrogen energy fuel cell.
Owner:NANJING UNIV OF TECH
Catalyst with low Pt loading capacity as well as preparation method and application thereof
PendingCN114284516AHas ORR activityIncrease ORR activityCell electrodesPtru catalystPhysical chemistry
The invention provides a catalyst with low Pt loading capacity, a preparation method and application thereof, and the method comprises the following steps: loading PtCeO2 on a non-noble metal catalyst to prepare PtCeO2 (at) M-N-C, M being a non-noble metal, C being a carbon element, and N being a nitrogen element. The method is suitable for various forms of non-noble metal catalysts, in addition, the reaction conditions of the Pt salt and the Ce salt are mild, a subsequent high-temperature pyrolysis process is not needed, Pt and CeO2 are in a highly dispersed state, and the utilization rate of Pt can be improved by improving the dispersity of Pt, so that the cost is reduced.
Owner:ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER +1
Preparation method of Fe3C nanoparticle-loaded porous nitrogen-doped graphene oxygen reduction catalyst
The invention discloses a preparation method of a Fe3C nanoparticle-loaded porous nitrogen-doped graphene oxygen reduction catalyst. The preparation method comprises the following specific steps: mixing and stirring graphene oxide, ferroporphyrin and a hard template agent SiO2, and carrying out centrifugal drying to obtain a material A; transferring the material A to a nickel boat, placing the nickel boat in a tubular furnace, conducting heating to 700 DEG C at a heating rate of 10 DEG C / min under the protection of inert gas, carrying out heat preservation for 180 min, and naturally conducting cooling to room temperature to obtain a material B; and transferring the material B into a container, adding an acidic solution, conducting soaking for 24 hours, washing the filtrate with high-purity water until the filtrate is neutral, and conducting drying in a blast drying oven at 80 DEG C for 12 hours to obtain the Fe3C nanoparticle-loaded porous nitrogen-doped graphene oxygen reduction catalyst. By adding the hard template agent SiO2, the specific surface area of the material is regulated and controlled, the pore structure is enriched, and the active sites of the oxygen reduction catalyst are increased, so that the oxygen reduction catalytic activity is improved.
Owner:HENAN NORMAL UNIV
Non-precious metal catalysts prepared from precursor comprising cyanamide
ActiveUS9169140B2Increase ORR activityStability is not easyWater treatment parameter controlGroup 8/9/10/18 element organic compoundsIron sulfateSulfur containing
Catalyst comprising graphitic carbon and methods of making thereof; said graphitic carbon comprising a metal species, a nitrogen-containing species and a sulfur containing species. A catalyst for oxygen reduction reaction for an alkaline fuel cell was prepared by heating a mixture of cyanamide, carbon black, and a salt selected from an iron sulfate salt and an iron acetate salt at a temperature of from about 700° C. to about 1100° C. under an inert atmosphere. Afterward, the mixture was treated with sulfuric acid at elevated temperature to remove acid soluble components, and the resultant mixture was heated again under an inert atmosphere at the same temperature as the first heat treatment step.
Owner:TRIAD NAT SECURITY LLC
Iron-nitrogen doped core-shell carbon sphere material and preparation method thereof
InactiveCN112331868AHigh active site densityImprove performanceMaterial nanotechnologyCell electrodesPtru catalystMetallurgy
The invention discloses an iron-nitrogen doped core-shell carbon sphere material and a preparation method thereof, and relates to the technical field of core-shell materials. The preparation method ofthe iron-nitrogen doped core-shell carbon sphere material comprises the following steps: (1) preparing polydopamine spheres; (2) preparing an iron-doped metal organic framework coated polydopamine sphere compound; and (3) preparing the iron-nitrogen doped core-shell carbon sphere material. Compared with a Pt / C catalyst sold in the market, the iron-nitrogen doped core-shell carbon sphere materialprepared by the method provided by the invention shows higher ORR activity.
Owner:WUYI UNIV
a mn 5 o 8 Nano cage oxygen reduction electrocatalyst and preparation method thereof
ActiveCN113690453BHigh catalytic activityHigh half-wave potentialMaterial nanotechnologyCell electrodesCrystal systemCubic crystal system
The invention discloses a kind of Mn 5 O 8 Nano cage oxygen reduction electrocatalyst and preparation method thereof. The MnO nanoflower-like material with coexistence of cubic crystal system and orthorhombic crystal system and containing oxygen vacancies is generated in situ by electrochemical reduction reaction. 5 O 8 Nano-caged oxygen reduction electrocatalyst, wherein the Mn 5 O 8 The nano-cage oxygen reduction electrocatalyst is monoclinic and presents a nano-cage structure formed by stacking nanosheets.
Owner:SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
A kind of porous concave cube conp@cosa-n-c catalyst and its preparation method and application
Owner:XIAMEN UNIV
A method for preparing high-performance carbon-based catalysts
The invention relates to a method for preparing a high-performance carbon catalyst, and belongs to the technical field of new energy materials. The method comprises the following steps: firstly, carrying out coordination on aniline and a transition metal salt to prepare a suspension liquid; secondly, filtering the prepared suspension liquid to obtain a filter cake, soaking the filter cake with a mixed solution of one or more of ethanol, water, acetone, diethyl ether, methyl alcohol and formaldehyde at any ratio for 15-120 minutes, cleaning the filter cake and then carrying out suction filtration, drying and grinding to obtain a nano dentate polyaniline metal coordination polymer; and finally carrying out thermal treatment on the obtained nano dentate polyaniline metal coordination polymer to prepare the high-performance carbon catalyst under an atmosphere condition. A non-noble metal carbon catalyst prepared by the method is low in price of used raw materials, simple in preparation technology, low in equipment requirement and suitable for large-scale production of the catalyst.
Owner:KUNMING UNIV OF SCI & TECH
A serial continuous flow microbial fuel cell system and its preparation method and its application in degrading nitrobenzene wastewater
ActiveCN113471501BImprove conductivityIncrease ORR activityWater treatment parameter controlTreatment by combined electrochemical biological processesOrganic matter mineralizationModified carbon
The invention belongs to the technical field of environmental protection water treatment and biological fuel cells, and provides a serial continuous flow microbial fuel cell system and preparation thereof in order to improve the limitation of nitrobenzene degradation rate of a single microbial fuel cell and improve the salinity of organic matter and power generation. The method and its application in degrading nitrobenzene wastewater are composed of two double-chamber microbial fuel cells MFC1 and MFC2. The anodes of MFC1 and MFC2 are left standing separately, and the cathodes are connected in series; the anode chamber and the cathode chamber are separated by an ion exchange membrane. On, the electrodes in the anode compartment and cathode compartment of MFC1 and MFC2 are Fe@Fe 2 O 3 / PANI / PEG modified carbon felt; a saturated calomel electrode is set in the cathode chamber as a reference electrode; the anode and cathode are connected to an external resistance of 1000Ω through copper wires to form a complete circuit loop, and a voltage collector is connected in parallel with the external resistance. The electron transfer and the mass transfer and throughput of the system are improved, and the performance and efficiency are improved.
Owner:TAIYUAN UNIV OF TECH
A kind of preparation method of monodisperse platinum series high entropy alloy nano particle catalyst
ActiveCN111111693BHigh Pt utilizationEasy to prepareMetal/metal-oxides/metal-hydroxide catalystsPtru catalystHigh entropy alloys
The invention relates to the technical field of material chemistry, and specifically discloses a method for preparing a monodispersed platinum-based high-entropy alloy nanoparticle catalyst, which includes the preparation of a silicon dioxide photonic crystal template and the preparation of a carbon precursor solution. The platinum precursor and a lot of In four other metal precursors dissolved in THF and CHCl 3 to obtain a mixed solution; mix the block copolymer F127, carbon precursor solution and tetraethyl orthosilicate, and add the protonic acid solution to the mixed solution respectively, and stir to obtain a transparent solution; add the transparent solution to the silica photon In the crystal template, it is dried and then heated and solidified to obtain a purple-brown solid; the purple-brown solid is calcined to obtain a gray solid; the gray solid is etched with strong alkali or strong acid, and then filtered and dried. The preparation method in this patent is used to obtain a monodisperse platinum-based high-entropy alloy nanoparticle catalyst with the advantages of controllable particle size, good dispersion and excellent performance.
Owner:CHONGQING UNIV
Cobalt-based oxygen reduction electro-catalytic material and preparation method thereof
The invention relates to a cobalt-based oxygen reduction electro-catalytic material and a preparation method thereof, and solves the problems of low catalytic activity, small catalytic active site density, low active site utilization rate, complicated preparation, high cost and the like of the existing non-noble metal ORR catalyst. ZIF-67 is used as a precursor, the coordination environment of a carbon-supported cobalt-based catalyst is accurately regulated and controlled through process parameters of carbonization and vulcanization processes, an electro-catalytic material which is mainly composed of Co-S-C, coexists with Co-N-C and Co-C and has a phase composition of Co1-xS is obtained, and the electro-catalytic activity of a single active site is remarkably enhanced. Moreover, cobalt atoms of the material are uniformly distributed in a carbon skeleton at high density, so that the density of active sites is improved; meanwhile, the material has a larger average pore size on the basis of high specific surface area, and the utilization rate of active sites is improved. The preparation method of the cobalt-based electrocatalyst is easy and convenient to operate, the consistency of synthetic materials is high, and the cobalt-based electrocatalyst has application and popularization value.
Owner:UNIV OF SCI & TECH BEIJING
Polyimide-Based Catalytic Cathodic Carbon Membrane Supporting Single Atom Catalyst and Its Application
ActiveCN111039388BEasy to prepareEasy to produceTreatment by combined electrochemical biological processesWater contaminantsCarbon filmPtru catalyst
The invention provides a polyimide-based catalytic cathode carbon membrane loaded with a single-atom catalyst and its application. Using the principle of MOF-based in-situ derivation of a single-atom catalyst, polyimide is used as the precursor of the carbon membrane, and the prepared Mix and disperse the MOF precursor and conductive nanomaterials in an organic solvent, then add the above solution into the polyamic acid solution, and scrape-coat the MOF polyamic acid hybrid film on a glass plate; finally, use the temperature programming method in the inert Carbonization is carried out in a gas atmosphere. During the carbonization process, the metal ions in the MOF are pyrolyzed in situ and reduced to single-atom catalysts. The polyamic acid is first converted into polyimide and then further forms a carbon film. The invention prepares a conductive cathode catalytic membrane with high mechanical properties, chemical corrosion resistance, high stability and high ORR activity. It is used in EMBR system, microbial fuel cell system, and electrocatalytic system, and is suitable for membrane treatment of high-concentration refractory organic industrial wastewater.
Owner:SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
A kind of fecx@nc core-shell structure catalyst and preparation method thereof
The invention relates to a FeCx@NC core-shell structured catalyst and a preparation method therefor. The FeCx@NC core-shell structured catalyst takes iron and FeCx nanoparticle mixture as the core, and takes nitrogen and FeCx-doped carbon as the shell, and has a mesoporous structure with a specific surface area of 500-900m<2>g<-1>. The preparation method for the core-shell structured catalyst comprises the steps of preparing a polyaniline and glucose composite material firstly; performing calcining for one time to prepare a Fe-N-C catalyst; and finally performing calcining for the second time to obtain the FeCx@NC catalyst. The catalyst is high in oxygen reduction activity and high in stability; the raw materials, such as the carbon source and the nitrogen source used by the preparation method are low in cost, so that the production cost for producing a Fe-N-C material by the conventional pyrolysis method can be lowered; meanwhile, the preparation method is simple and easy to implement; and in addition, the core-shell structured catalyst provided by the invention has relatively high electrocatalytic activity, and can be widely applied to the negative electrode catalyst of a proton exchange membrane fuel cell, an alkali negative ion exchange membrane fuel cell, and a metal air battery.
Owner:DALIAN UNIV OF TECH
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