71 results about "Cathodic catalyst" patented technology

The invention provides a preparation method of a bimetal organic framework composite material. According to the preparation method, the methanol solution of 2-methylimidazole is added into a zinc salt-containing solvent, and the methanol solution and the zinc salt-containing solvent are stirred uniformly, an obtained mixed solution stands still, so that ZIF-8 can be obtained; the methanol solutionof 2-methylimidazole is added into a solvent containing a proper amount of ZIF-8 and cobalt salt, and the methanol solution and the solvent are uniformly stirred, and an obtained mixed solution stands still, so that a bimetal organic framework precursor ZIF-8@ZIF-67 is obtained; the precursor is transferred into a tubular furnace so as to be subjected to high-temperature annealing, and porous carbon of a core-shell structure is obtained through derivation; the porous carbon material is mixed with PDDA, an obtained mixture is stirred, and the mixture is compounded with graphene oxide; and an obtained product is subjected to freeze-drying and high-temperature annealing sequentially, so that a porous carbon / graphene composite material is obtained. The porous carbon material prepared by the method disclosed by the invention is uniformly distributed on a graphene sheet layer; the composite material is good in stability and low in cost; and when the composite material is applied to an MFC cathode catalyst, the composite material shows good electrochemical catalytic performance.

The invention discloses a nano lithium manganite loaded carbon material cathode catalyst used for oxygen reduction of an air electrode as well as a preparation method of the nano lithium manganite loaded carbon material cathode catalyst. The nano catalyst is obtained by mixing organic dispersion solutions of potassium hypermanganate, lithium hydroxide and a carbon material through liquid-phase ultrasounds and carrying out a one-step hydrothermal reaction. Nano lithium manganite prepared by the method is uniformly loaded on the surface of the carbon material, and grains have uniform sizes and high purity. The catalyst can be applied to a metal-air battery and other energy conversion systems needing the oxygen reduction of the air electrode, and has relatively high coulombic efficiency, excellent multiplying power charge-discharge performances and good battery circulating stability; and the method for preparing the catalyst is simple, has good process repeatability, is low in cost and is suitable for industrial large-scale production.

The invention discloses a V-Ni3FeN / Ni (at) N-GTs full electrolysis water electric catalyst constructed on the basis of doping and heterojunction strategies. The preparation method comprises the following steps: firstly, growing a V-doped Ni Fe precursor on a nitrogen-doped graphene tube carrier through a hydrothermal method, then heating to 470 DEG C in a tubular furnace, introducing ammonia gas, and nitriding for 2 hours to obtain the electrocatalyst consisting of V-doped Ni3FeN and Ni nanoparticles grown on the nitrogen-doped graphene tube in situ, namely V-Ni3FeN / Ni-N-GTs. Based on the synergistic effects of effective regulation and control of V doping on Ni and Fe electronic structures in Ni3FeN, rearrangement of charges induced by a heterojunction interface of V-Ni3FeN and Ni, good conductivity of a nitrogen-doped graphene tube carrier and the like, the electrocatalyst shows excellent electrocatalytic activity and stability in hydrogen evolution reaction and oxygen evolution reaction in an alkaline medium; the catalyst can be used as an anode catalyst and a cathode catalyst at the same time, is used for catalyzing a full hydrolysis reaction, can reach the current density of 10mA cm <-2 > only by needing the cell voltage of 1.55 V, and shows excellent stability.

The invention discloses a preparation method of a porous carbon electrode, which comprises the following steps: adequately mixing water, polytetrafluoroethylene, black carbon and polymethylmethacrylate microspheres with the particle sizes of 5-250 mum, processing the obtained mixture into a needed shape, drying and determining the nature of the obtained mixture, and then, soaking the obtained mixture in a microsphere solvent or removing the polymethylmethacrylate microspheres by utilizing an extractive distillation method, and drying to obtain the porous carbon electrode. The porous carbon electrode prepared by the embodiment of the invention has an aperture and a porosity which are easy to control; further, pore structures are regular and orderly, so that a capacitor adopting the porous carbon electrode has the discharge capacity which is 12%-60% higher than that of a conventional similar container; furthermore, an organic solvent used in the preparation method can be utilized repeatedly and is energy-saving and environment-friendly; and in addition, as no expensive cathodic catalyst is necessary to be added, the production cost is decreased.

The invention relates to the technical field of building materials, and aims to provide a preparation method of a manganese phthalocyanine modified oxhorn-shaped carbon-based catalyst. The preparationmethod comprises the following steps: calcining a mixture of ammonium bromide and melamine to obtain carbon nitride, and pyrolyzing in a nitrogen atmosphere; and cleaning and drying the product to obtain the oxhorn-shaped carbon-based catalyst; dispersing the manganese phthalocyanine modified oxhorn-shaped carbon-based catalyst into an N-N-dimethylformamide solution, performing ultrasonic treatment, adding manganese phthalocyanine molecules, performing ultrasonic treatment, stirring, cleaning and drying to obtain the manganese phthalocyanine modified oxhorn-shaped carbon-based catalyst. The product provided by the invention has rich porous structure, high specific surface area, high content of pyridine nitrogen and pyrrole nitrogen active sites and good conductivity, and is an efficient cathode catalyst. The carbon-based catalyst with the horn-shaped structure has a tip effect to enrich charges under the action of an electric field, so that the efficient reduction reaction of CO2 is promoted. Manganese single atoms in phthalocyanine manganese molecules are used as active sites, so that the reaction energy barrier of reducing CO2 into an intermediate product COOH * is reduced, theconversion reaction of CO2 into a CO gas product is promoted, and the Faraday efficiency is high.

Provided is an apparatus containing, as a cathode catalyst, a metal oxide / carbon catalyst composition. The metal oxide / carbon catalyst composition includes 40 to 95 wt % porous Mn—Co spinel oxide nanoparticles of the formula MnxCo3-xO4. The nanoparticles have an octahedral morphology, an average particle size of 5-100 nm, and average pore sizes of 1-5 nm (where x is the atomic fraction of manganese and 3-x is the atomic fraction of cobalt). The metal oxide nanoparticles are supported on a carbon substrate that contains at least 96 atomic % carbon.