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

The invention discloses a preparation method for preparing trimanganese tetraoxide / nitrogen-doped carbon nanotube composite material, which specifically comprises preparing exfoliated carbon nanotubes into a certain concentration of exfoliated carbon nanotube dispersion liquid, and then adding a certain amount of concentrated ammonia water to make the dispersion solution It becomes an alkaline dispersion solution with alkalinity; after the manganese salt is formulated into a manganese salt solution of a certain concentration, the manganese salt solution and nitrogen source are added to the alkaline dispersion solution, and after stirring for a certain period of time, the alkaline dispersion solution is put into The ultrasonic reactor device at a constant temperature reacts for a certain period of time to obtain a dispersed solution; finally, the dispersed solution is repeatedly suction-filtered, washed several times, and finally vacuum-dried to obtain a composite material of trimanganese tetraoxide / nitrogen-doped carbon nanotubes. The technical scheme of the invention can further optimize the preparation method and process of the transition metal oxide.

A preparation method for a carbon-supported nano-silver catalyst, comprising: using a -NH2 functional group-containing compound and AgNO3 as raw materials, synthesizing a high molecular metal complex by means of a coordination reaction, then calcining the high molecular metal complex at a high temperature, and then performing other post-treatments, so as to prepare a carbon-supported nano-silver catalyst which can be used for ORR. The catalyst uses a wide range of raw materials, and has low price and simple experimental operation. The active site Ag nanoparticles thereof are uniformly distributed. The catalyst exhibits excellent ORR performance, has universality, and can be prepared by using different NH2 functional group-containing compounds and solvents.

The invention discloses a method for preparing a zinc-air battery catalyst of a carbon-nitrogen-based iron material. The method comprises a step of obtaining a polypyrrole-iron complex by synthesis, astep of obtaining a bimetallic zeolite imidazole framework nanocrystal by synthesis, a step of obtaining a composite material formed by the synthesizing the bimetallic zeolite imidazole framework nanocrystal and a carbon-nitrogen-based iron material framework, and a step of dissolving a composite material as a catalyst and acetylene black in a solution containing ethanol and Nafion, performing ultrasonic processing to obtain a uniformly dispersed slurry, and uniformly applying the slurry to fiber paper processed by polytetrafluoroethylene to be a positive electrode of a zinc-air battery. Thecatalyst proposed by the invention has excellent ORR performance and excellent OER catalytic activity, the performance of the catalyst is better than the performance of a commercial Pt / C catalyst andis better than that of a bifunctional catalyst in the prior art.

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.

A Fe43.4Pt52.3Cu4.3 heterogeneous phase structure polyhedron nanoparticle, a preparing method and an application as an efficient fuel cell oxygen reduction catalyst are provided. The Fe43.4Pt52.3Cu4.3 heterogeneous phase structure polyhedron nanoparticle, includes: three elements of Fe, Pt and Cu; wherein the Fe43.4Pt52.3Cu4.3 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 belongs to the field of nanometers, and specifically discloses a Pd2PtAg nanocrystal and its preparation method and application. The Pd2PtAg nanocrystal disclosed in the invention has a multi-legged shape, and its crystal phase is a face-centered cubic phase. This Pd2PtAg nanocrystal has excellent ORR performance. At the same time, due to the "one-pot cooking" preparation method and the programmed temperature control mode to obtain Pd2PtAg nanobody, it has the industrial characteristics of simple process, low reaction temperature and short time, and is suitable for mass production.

A non-precious metal oxygen reduction reaction catalyst with highly dispersed metal active sites and a preparation method thereof, using calcium oxide (CaO) or magnesium oxide (MgO) generated in situ as a template, and natural product heme or heme containing Fe or Co Vitamin B12 (VB12) and different sulfur sources are used as catalyst precursors to prepare highly dispersed non-precious metal catalysts with active sites, the process is simple, the cost is low, and it is suitable for large-scale applications; the catalyst prepared by the invention has the characteristics of multi-level porous pore structure and High specific surface area, good metal dispersion, high catalytic activity for oxygen reduction reaction, high catalytic selectivity and electrochemical stability, ORR performance superior to commercial Pt / C, Can be used in fuel cells and metal-air batteries.

The invention discloses a preparation method of a sulfur-doped bifunctional oxygen catalyst based on ZIF-67 (zeolite imidazolate framework material) and conductive graphene, and belongs to the technical field of zinc-empty battery catalysts. Using ZIF‑67 as a template, adding a certain amount of conductive graphene and thioacetamide as a sulfur source, a carbon porous nanocomposite was prepared by one-step solvothermal synthesis and calcined in an inert atmosphere. The carbon material inherited The porous structure of ZIF effectively increases the specific surface area of ​​the catalyst, and the addition of conductive graphene and sulfur sources increases the active sites, the specific surface area of ​​the material, and the conductivity of the material, which is more conducive to the conduction of electrons. The obtained catalyst has good electrocatalytic activity for oxygen reduction (ORR) and oxygen evolution (OER) in alkaline medium, and the electrocatalytic performance of this bifunctional oxygen catalyst has been improved, which has potential application value in the field of energy conversion and storage.

A method of making carbon nanotubes doped with iron, nitrogen and sulfur for an oxygen reduction reaction catalyst includes the steps of mixing an iron containing oxidizing agent with a sulfur-containing dye to form a fibrous fluctuate of reactive templates and using these for in-situ polymerization 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.