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42results about How to "Increase ORR activity" patented technology

Co@NC high-dispersion core-shell structure catalyst, and preparation method and application of catalyst

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

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

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

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

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

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

Co atom-doped polyhedral MOFs (Metal-Organic Frameworks) material as well as preparation method and application thereof

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

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

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

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

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

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

Iron-nitrogen doped core-shell carbon sphere material and preparation method thereof

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

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 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

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

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

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

A kind of n, s co-doped metal-free cns oxygen reduction catalyst and its preparation method

An N, S co-doped metal-free CNS oxygen reduction catalyst and a preparation method thereof belong to the technical field of energy materials and electrochemistry. The present invention uses glucose as carbon source, with g-C 3 N 4 As nitrogen source and soft template agent, polysulfide as sulfur source, three-dimensional porous carbon material catalyst was synthesized by hydrothermal-calcination two-step method. The obtained CNS catalyst is a three-dimensional porous graphene-like structure, and the surface contains a large number of pore structures. The ORR of the catalyst has an initial potential of 1.01V and a half-wave potential of 0.88V in an alkaline electrolyte, which is higher than that of a commercial Pt / C catalyst. Good catalytic performance. The invention has a large number of channels, which can expose more active sites, which is conducive to the transmission of ORR reaction substances and the improvement of the ORR catalytic activity of the material; the selected reagent has low toxicity, wide source of raw materials, low cost, and the preparation process is simple and convenient. Green and pollution-free, easy to scale up production, and conducive to large-scale application; it can be used in acidic and alkaline primary and secondary batteries involving ORR, such as fuel cells and metal-air batteries.
Owner:DALIAN UNIV OF TECH
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