38results about How to "Excellent oxygen evolution catalytic performance" patented technology

A Heteroatom Nitrogen Surface Modified MoS 2 The preparation and application of nanometer materials belong to the technical field of electrocatalytic material synthesis. The prepared catalyst has excellent electrocatalytic oxygen evolution performance. The preparation process includes the following steps: (1) carbon cloth (3*3cm) is ultrasonicated in acetone, ethanol, and water for 10 minutes; (2) ammonium molybdate and thiourea are mixed in water in proportion and reacted with clean carbon cloth React at high temperature in the kettle. After cooling down to room temperature, rinse the carbon cloth with ethanol and water in turn, and dry it; (3) the MoS obtained in step (2) 2 Nanosheets and ammonia water are placed in a reactor at high temperature for a certain period of time to obtain heteroatom nitrogen-modified MoS 2 nanomaterials. The catalyst obtained in the invention exhibits excellent electrocatalytic performance, has a simple preparation process and low cost, and is suitable for large-scale production.

The invention relates to a FeNiCo oxygenated chemical nanosheet with adjustable metal proportion as well as a preparation method and application thereof. The preparation method comprises the followingsteps that S1, a metal organic framework ZIF-67 is prepared by adopting a normal-temperature standing precipitation method; S2, FeSO4*7H2O and NiSO4*6H2O are weighed according to a certain ratio andare fully dissolved in deionized water so as to obtain liquid A, and a proper amount of metal organic framework ZIF-67 powder obtained in the step S1 is taken and and is fully dispersed in absolute ethyl alcohol so as to obtain liquid B; S3, the liquid B is rapidly poured into the liquid A, and stirring is carried out; and S4, a product obtained in the step S3 is washed, and a centrifuged productis subjected to freeze drying so as to obtain the FeNiCo oxygenated chemical nanosheet with uniform morphology. The FeNiCo oxygenated chemical nanosheet as well as the preparation method and application thereof have the beneficial effects that the FeNiCo oxygenated chemical nanosheet serves as an anode for electrocatalytic water decomposition, and the oxygen evolution catalytic performance is excellent; and the material is simple in synthetic process, low in cost, environmentally-friendly and extremely high in repeatability.

The invention discloses an in-situ loading of SnO on foamed nickel 2 The preparation method of nanoparticle-doped graphite-carbon composite material and the application of electrolysis of water and oxygen evolution based on the catalyst belong to the technical fields of nanomaterials, nanocatalysis, and metal-organic framework materials. The main steps are electrodepositing nickel foam in terephthalic acid and iron (Ⅲ) solution with tin powder, and annealing the obtained composite material in air atmosphere at 300°C. The catalyst is prepared with low raw material cost, simple preparation process, low reaction energy consumption, and has industrial application prospects. The catalyst is used for efficiently catalyzing oxygen evolution in electrolyzed water, and has good oxygen evolution electrocatalytic activity and electrochemical stability.

The invention discloses a method for preparing a highly active ternary metal oxide oxygen evolution catalyst by using waste ternary nickel cobalt lithium manganate. Make powder, soak it in dilute hydrochloric acid, take the supernatant and record it as A; (2) Add NaOH solution to A until the solution is neutral to obtain B; (3) Add hexadecyl trimethyl to B Ammonium bromide to get C; (4) Put copper foam into C, use the copper foam as the working electrode and C as the reaction solution, soak the copper foam on the surface of the solution C, and discharge the copper foam plasma in an oxygen atmosphere to make the The chemical reaction occurs rapidly on the surface; (5) the above-mentioned self-supporting electrode is washed and then dried to obtain a highly active ternary metal oxide oxygen evolution catalyst. The method of the invention is simple, the conditions are mild, and the high-activity oxygen evolution catalyst can be rapidly prepared.

The invention discloses a preparation method of a MOF catalyst with enhanced catalytic activity of gluconic acid and an application based on the catalyst for water electrolysis and oxygen evolution, belonging to the technical fields of nano-catalysis, nano-materials and metal-organic framework materials. The main steps are as follows: after blending the isophthalic acid solution and the nickel nitrate solution at room temperature, adding the prepared gluconic acid solution, using the mixed solution as an electrolyte to deposit on the nickel foam, and after activation, the nickel gluconate-metaphthalic acid is obtained. Nickel formate composite catalyst, that is, MOF catalyst with enhanced catalytic activity of gluconic acid. The cost of raw materials used in the preparation of the catalyst is low, the preparation process is simple, the reaction energy consumption is low, and the catalyst has industrial application prospects. The catalyst is used for efficiently catalyzing the electrolysis of water for oxygen evolution, and has good electrocatalytic activity and electrochemical stability for oxygen evolution.

The invention relates to a method for modifying and optimizing an iridium dioxide catalyst, in particular to a method for modifying and optimizing an anode catalyst of a membrane electrode assembly in pure water electrolysis hydrogen production technology, and belongs to the field of preparation of precious metal catalyst materials. The steps of the method are as follows: heat the iridium dioxide catalyst to 600°C to 900°C for 2h to 5h at a heating rate of 2°C / min to 10°C / min in an atmosphere of oxygen, and cool it after the heat treatment is completed. A modified and optimized iridium dioxide catalyst is obtained; the atmosphere with oxygen cannot contain gas that can react with oxygen. The method optimizes the performance and structure of the existing iridium dioxide catalyst through heat treatment, so that it has good oxygen evolution catalytic activity and stability.

The invention discloses a preparation method of a catalyst based on a nickel-based three-dimensional metal organic frame substance and an application of oxygen evolution by water electrolysis based onthe catalyst, and belongs to the technical field of nanomaterials, nano catalysis and metal organic frame substance materials. The method mainly comprises the steps of performing electro-deposition on polyaniline with foamed nickel to form a Ni@PANI composite, applying gel prepared from a ligand H3TATAB and cobalt nitrate on the Ni@PANI composite, and heating in an air atmosphere to form a Ni@Co2O3 / CN composite catalyst, namely the catalyst based on the nickel-based three-dimensional metal organic frame substance. Raw materials used for preparation of the catalyst are low in cost; a preparation technology is simple; the reaction energy consumption is low; and the catalyst has industrial application prospects. The catalyst is used for efficient catalysis of water electrolysis for oxygen evolution and has good oxygen evolution electrocatalytic activity and electrochemical stability.

The invention provides a kind of porous nano-flower Ni 2 The preparation method of P material includes the method of self-assembly induced by solvent volatilization to prepare nickel precursor, and then obtain nickel compound by roasting, and further use phosphorus source for phosphating treatment to obtain Ni 2 P material. Another aspect of the present invention provides a Ni 2 P material. Ni prepared by the present invention 2 The P material is used in the oxygen evolution reaction of electrolyzed water, and has fast catalytic kinetic performance and good catalytic stability. The invention has the advantages that the preparation method is simple to operate, the material has a stable morphology and structure, and has a porous structure, which is beneficial to the contact between the reactant and the catalyst during the catalytic reaction process, and the material transport of the reactant and the product.

The invention discloses a sulphur vacancy richened Ni3S2 nanorod oxygen evolution electro-catalysis material and a preparing method and application thereof, and belongs to the field of electrolytic water catalysis. The preparing method comprises three steps that firstly, a precursor film layer is prepared through anodic oxidation treatment of a nickel sheet; secondly, the precursor film layer is subjected to annealing treatment to obtain oxygen vacancy richened NiO film layer; and finally, the film layer obtained after annealing is subjected to hydrothermal sulfidizing to obtain the sulphur vacancy richened Ni3S2 nanorod oxygen evolution electro-catalysis material. As the existence of the sulphur vacancy, energy barriers needing to be overcome by a midbody on adsorption or desorption on the catalyst surface are reduced, and the oxygen evolution catalytic performance is greatly improved. Sulphur vacancy richened Ni3S2 nanorods grow on a nickel substrate in situ, the resistance between acatalyst and the substrate is reduced, and meanwhile, the oxygen evolution catalyzing stability is improved. The method is simple in operation, the requirement for preparing equipment is low, the material is environment-friendly, the preparing method has generalizability, and the development and application of the transition metal sulfide catalyst are further promoted.

The invention provides a preparation method of alpha-manganese dioxide. By the preparation method, regulation and control of the Mn<3+> content of the alpha-manganese dioxide can be achieved through change of the reaction temperature and the reaction time; moreover, a catalyst obtained after compounding the prepared alpha-manganese dioxide with nitrogen-doped conductive carbon powder has excellentoxygen reduction and oxygen evolution catalyzing performance; by the preparation method, doping of trivalent manganese ions and preparation of the alpha-manganese dioxide can be completed in one pot;in addition, a reaction condition is mild, the synthesis process is simple, and environment friendliness is achieved.

The invention discloses a FeSe-based amorphous thin film catalyst and its preparation method and application. The structural formula according to the atomic percentage of each element is: Fe x co y Se z , wherein 20≤x≤50, 20≤y≤50, 5≤z≤35, x+y+z=100, y≤x+z. The FeSe-based amorphous thin film catalyst of the invention is prepared by a method of magnetron sputtering coating, has good oxygen evolution performance, and can be used as an oxygen evolution catalyst.