32results about How to "Excellent ORR performance" patented technology

A method of making carbon nanotubes doped with iron, nitrogen and sulphur for an oxygen reduction reaction catalyst includes the steps of mixing an iron containing oxidising agent with a sulphur-containing dye to form a fibrous fluctuate of reactive templates and using these for in-situ polymerisation of an azo compound to form polymer-dye nanotubes, adding an alkali to precipitate magnetite, and subjecting the nanotubes to pyrolysis, acid leaching, and heat treatment.

The invention discloses a nitrogen-doped graphene catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: drying and dehydrating glucose and urea, and mixing with melamine, wherein the mass ratio of the urea to melamine is 2-4; uniformly grinding the mixture, and calcining the mixture into a muffle furnace at the temperature of 550 DEG C for 3 hours; cooling and grinding uniformly, adding the mixture into a tube furnace, introducing into nitrogen protection, calcining at the temperature of 850-1000 DEG C for an hour, thereby obtaining the nitrogen-doped graphene catalyst. According to the in-situ nitrogen-doped graphene disclosed by the invention, the used raw materials are low in price, the method is simple, the yield is high, and graphite-like nitrogen doped graphene with the highest ratio is obtained by changing the rate of the raw materials and the temperature, so that the catalyst has a good oxidation-reduction effect, and expensive Pt can be replaced to a certain degree.

The invention relates to a nitrogen-doped carbon nanotube oxygen-reduction electrocatalyst and a preparation method thereof. The preparation method comprises the steps of growing a bimetal zeolite imidazate framework structure material (ZIF) on sheet-shaped graphite-phase carbon nitride (g-C3N4) in an in-situ way, and then performing high-temperature thermal processing, wherein g-C3N4 is obtainedby pyrolysis of a low-cost biologic material. The electrocatalyst is a porous nitrogen-doped carbon nanotube material wrapped with transition metal or a compound thereof. The preparation method is simple in process and low in cost, the low-cost biological material is introduced and is calculated at a low temperature to generate the g-C3N4 material, the bimetal ZIF material is carried, and the effective nitrogen-doped carbon nanotube electrocatalyst is obtained by high-temperature pyrolysis. The prepared nitrogen-doped carbon nanotube oxygen-reduction catalyst has a large amount of mesopores and high specific area, shows high catalytic activity on oxygen-reduction reaction and can be used as a negative catalyst widely applied to the field of a fuel cell and a metal-air battery.

The invention discloses a large-scale preparation method and an application of a metal and metal derivative composited 2D carbon plate aerogel material and belongs to the technical field of preparation of functional nano-materials. Water is added to an agarose and metal salt mixture, a mixed solution is subjected to microwave heating treatment in a microwave reactor, composite foam of metal salt-agarose is obtained, the foam is further calcined, and carbon aerogel consisting of metal nanoparticle composited 2D carbon plates is obtained. The carbon aerogel prepared with the method has high specific surface area, high graphitization degree and relatively large 2D area, thereby having the characteristics of high conductivity, rapid ion transmission channels, highly active sites and the like,and having the advantages of high power capacity, high stability and high activity in energy storage and electrochemical catalysis reaction. The whole preparation process of the material is simple, the raw materials are cheap, and the material is suitable for large-scale production.

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.

A method of preparing a tricobalt tetroxide material loaded by nitrogen-doped exfoliated carbon nanotubes is disclosed. The method includes subjecting carbon nanotubes to liquid-phase exfoliation witha strong oxidant and a concentrated acid to prepare exfoliated carbon nanotubes; and loading the exfoliated carbon nanotubes with tricobalt tetroxide nanoparticles through a hydrothermal reaction manner, wherein the exfoliated carbon nanotubes react with a nitrogen source and a cobalt source to obtain the tricobalt tetroxide material loaded by nitrogen-doped exfoliated carbon nanotubes. The method is simple in process, raw materials are easily available, and the method is prone to industrial production. In addition, the prepared tricobalt tetroxide material loaded by nitrogen-doped exfoliatedcarbon nanotubes has good ORR performance, excellent OER performance and a good application prospect in the field of oxygen electrocatalysis.

The invention relates to a nitrogen and iron doped conjugated microporous carbon material, and a preparation method and application thereof. A nitrogen-containing conjugated microporous polymer (CMP)is synthesized through a Sonogashira-Hagihara coupling reaction, then an iron element is directionally doped, and finally carbonizing is realized through high-temperature pyrolysis to prepare the nitrogen and iron doped conjugated microporous carbon material. According to the invention, the Fe element is directionally doped into the conjugated microporous polymer, so that the conjugated microporous polymer successfully shows good oxygen reduction catalytic activity, can be used as a positive electrode catalyst for a fuel cell and provides a new choice for positive electrode materials of fuel cells. The preparation method is simple in preparation process and convenient to control.

The invention discloses a catalyst with Pd-Co nano-alloy loaded on TiO2 containing oxygen vacancies and a preparation method and application thereof, the catalyst is composed of a carrier and an active component loaded on the carrier, the carrier is TiO2 containing oxygen vacancies on the surface, the active component is Pd-Co nano-alloy, and the total loading amount of the Pd-Co nano-alloy is 6-15 wt%, preferably 13 wt%; the mass ratio of the metal Pd to the metal Co is 5: 1-5: 10, preferably 5: 8. The preparation method of the catalyst is simple, green and environment-friendly, the Pd-Co nano-alloy active components of the prepared catalyst are uniformly distributed on the TiO2 carrier containing oxygen vacancies, and the catalyst shows good oxygen reduction characteristics and has wide application prospects.

The invention belongs to the field of nanometers, and particularly discloses metastable nanocrystal and a preparation method and application thereof. The metastable nanocrystal disclosed by the invention is Pd2MAg nanocrystal, wherein M is Fe, Co, Cu or Mn. The metastable nanocrystal has excellent ORR performance, and the ORR in a fuel cell can be efficiently catalyzed. Meanwhile, the preparation method is simple, the reaction temperature is low, the reaction time is short and the preparation method is suitable for mass production, and meets the industrial production requirements.

The invention relates to an electrocatalytic oxygen reduction catalytic material N-PC@CBC as well as a preparation method and application thereof. The preparation method comprises the following stepsof S1, dispersing bacterial cellulose (BC) and zinc nitrate hexahydrate into methanol, and dissolving 2-methylimidazole into a methanol solution with the same volume; S2, stirring the two solutions obtained in the step S1, and standing to form a ZIF-8-coated BC nanofiber composite material; and S3, freezing and drying the ZIF-8-coated BC material and carrying out high-temperature carbonization toobtain the N-PC@CBC material. The preparation method provided by the invention has the characteristics of excellent performance, simple process flow, low cost, safety, environmental protection and thelike, and compared with a commercial 20wt% Pt/C catalyst, the obtained catalyst shows better methanol tolerance and stability in an alkaline medium, and a sodium ion battery prepared by taking the obtained product as an electrode shows good cycling stability and has high specific capacity after multiple cycles.

The invention discloses a hollow bowl-shaped carbon carrier, a preparation method of the hollow bowl-shaped carbon carrier, a platinum-based catalyst and a membrane electrode. The preparation method of the hollow bowl-shaped carbon carrier comprises the following steps: a, adding tetraethoxysilane into a water-soluble dispersant, and mixing; b, a first component and a second component are added into the solution obtained in the step a, a solid product is obtained through filtering, washing and drying, the first component is selected from one of m-aminophenol, phenol, cresol, xylenol, resorcinol, tert-butyl phenol or bisphenol A, and the second component is selected from one of formaldehyde, acetaldehyde or furfural; c, carbonizing the solid product in the step b in an inert atmosphere, and then switching to an oxidizing atmosphere for activating treatment to obtain a sintered product; and d, adding the sintered product in the step c into a hydrofluoric acid aqueous solution to remove SiO2, filtering, washing and drying to obtain the bowl-shaped carbon carrier. According to the preparation method disclosed by the invention, the carbon carrier with the hollow bowl-shaped structure can be prepared, and the platinum-based catalyst prepared by using the carbon carrier as the carrier can be applied to the field of electro-catalysis and can show excellent catalytic performance.

The invention provides a preparation method and application of a FeSn compound coated NC electrocatalyst. The preparation method comprises the following steps: adding a ZIF-8 precursor into a methanol solution of ferric nitrate nonahydrate and tin acetate, soaking and stirring, centrifugally washing with methanol, drying in a vacuum drying oven, uniformly grinding the obtained powder in a mortar, placing in the center of a tubular furnace, and performing high-temperature pyrolysis in an inert atmosphere to obtain the FeSn compound-coated NC electrocatalyst. The catalyst has the advantages of larger specific surface area, excellent ORR catalytic activity and stability and the like, and has potential application in the field of oxygen reduction reaction.

The invention discloses a preparation method of a fullerene C60 derived electrocatalyst, and relates to the technical field of catalyst preparation. The preparation method comprises the following steps: dissolving 800.0 mg of fullerene C60 in 300.0 mL of p-xylene, stirring, adding 30 mL of propane diamine, and then magnetically stirring; draining the mixed liquid obtained after stirring into a separating funnel, standing for layering, and collecting lower-layer turbid liquid; the turbid liquid is washed with a 0.1 mol/L hydrochloric acid solution, centrifugation and washing are conducted after washing, and after the turbid liquid is neutral, the turbid liquid is put into a vacuum drying oven to be dried; taking 200.0 mg of a dried sample, placing the dried sample in a porcelain boat, placing the porcelain boat in a vacuum tube furnace for calcination, introducing nitrogen into the vacuum tube furnace at a flow rate of 50-100 ml/min, heating to 300-700 DEG C at a heating rate of 5-10 DEG C/min, and keeping the temperature for 2-6 hours to obtain the fullerene C60 derivative electrocatalyst. The method disclosed by the invention is simple, convenient and rapid, and the fullerene C60 derivative electrocatalyst prepared by the method disclosed by the invention has a stable graphitized structure and excellent electrocatalytic oxygen reduction performance.

A Fe_43.4Pt_52.3Cu_4.3 heterogeneous phase structure polyhedron nanoparticle, a preparing method and an application as an efficient fuel cell oxygen reduction catalyst are provided. The Fe_43.4Pt_52.3Cu_4.3 heterogeneous phase structure polyhedron nanoparticle, includes: three elements of Fe, Pt and Cu; wherein the Fe_43.4Pt_52.3Cu_4.3 heterogeneous phase structure polyhedron nanoparticle has a heterogeneous phase structure in which face-centered cubic and face-centered tetragonal coexist; wherein the heterogeneous phase structure is a face-centered tetragonal phase shell and face-centered cubic core with a high crystal plane index; a surface of the polyhedron nanoparticle has 1 to 2 atomic layers of enriched with Pt; a diameter distribution of the nanoparticles is at a range of 4.5 to 14.5 nm, and an average size is 8.4 nm. In the invention, hexadecylamine, iron acetylacetonate, copper acetylacetonate, platinum acetylacetonate, and 1,2-hexadecanediol are uniformly mixed, and oleylamine and oleic acid are added, condensed refluxed at 320-330° C.

The invention discloses a Ni-Fe MMO film modified foamed nickel catalyst and a preparation method and application thereof, the catalyst is composed of a carrier and an active component loaded on the carrier, the carrier is commercial foamed nickel, and the active component is a Ni-Fe MMO film. The preparation process of the catalyst is carried out in a two-electrode working system, a platinum sheet electrode is used as a counter electrode, commercial foamed nickel is used as a working electrode, and a mixed aqueous solution containing ferric salt, nickel salt and ammonium salt is used as an electroplating solution to carry out electrolytic reaction, so that a layer of Ni-Fe MMO film is electrodeposited on the commercial foamed nickel, and the catalyst is obtained. The finally prepared catalyst can be well used for preparing a cathode of a hydrogen peroxide reaction module through oxygen reduction. The catalyst disclosed by the invention is simple in preparation process flow, low in metal loading capacity and low in cost, has good performance and stability of producing hydrogen peroxide through oxygen reduction, and has huge application potential.

The invention belongs to the technical field of new energy materials, and particularly discloses a preparation method of a high-breathability porous-structure carbon-based catalyst, which comprises the following steps: dissolving zinc salt, nickel salt and phthalocyanine iron in a solvent, and dispersing to obtain a solution A; dissolving an initiator in 1-vinyl imidazole, and heating and polymerizing under the protection atmosphere of inert gas to obtain a solution B; mixing the solution A and the solution B, performing hydrothermal treatment, washing and drying to obtain a reaction product; and carbonizing the reaction product to obtain the carbon-based catalyst. A polyvinyl imidazole-Zn series precursor is adopted as a carbon source and a nitrogen source, and iron phthalocyanine is added, so that a large number of micropores, mesopores and macropores are generated in the high-temperature carbonization process of the material, the prepared catalyst has a hierarchical porous structure, and the specific surface area can reach 985-1240m < 2 >/g; the half-wave potential of oxygen reduction reaches 0.82 to 0.88 V, and the overpotential of oxygen evolution of 10mA/cm < 2 > reaches 1.57 to 1.76 V.