44results about How to "Excellent OER performance" patented technology

The invention belongs to the technical field of energy materials, and discloses preparation of a heterostructure self-supporting electrode material and an application. The method comprises the following steps: (1) firstly enabling MIL-88A to grow on the surface of carbon cloth through a hydrothermal reaction; (2) then enabling Ni (OH) 2 to grow on the surface of MIL-88A through a secondary hydrothermal reaction, so as to finish the preparation of the heterostructure self-supporting electrode. The method is simple and low in cost; the prepared composite material has excellent oxygen productionperformance and excellent long-term stability. The carbon cloth is used as a self-supporting electrode, so the defect of poor intrinsic conductivity of MIL-88A is overcome, and the organic metal framework plays the maximum catalytic performance. The preparation method is free of a high-temperature calcination process, energy is saved while an organic metal framework structure is not damaged, and the method is environmentally friendly and has industrial prospects.

The invention discloses an in-situ composite electrode of a nitrogen-phosphorus co-doped carbon nanotube coated cobalt-iron bimetallic alloy catalyst, a preparation method and application thereof. The preparation method comprises: preparing an in-situ flaky MOF precursor on a carbon paper substrate; immersing the carbon paper growing the MOF precursor in a ferrous sulfate solution, and obtaining an iron-containing MOF in an aqueous solution cation exchange process; drying Then put it into the reaction kettle containing phosphorus source, and heat to realize gas-phase phosphorus doping; in Ar flow or N 2 In the gas flow, carbon nanotubes were prepared in situ by urea annealing. The product obtained by the technical solution of the present invention constructs a variety of highly electrocatalytic active sites, including metal particles coated on the top of carbon nanotubes, and nitrogen and phosphorus co-doped carbon active sites. It has excellent and stable three-functional catalytic activity of HER, OER and ORR.

The invention provides a preparation method of a bifunctional molybdenum-doped cobalt sulfide / nitrogen-carbon array electrode. The cobalt-based precursor array structure is obtained by chemical bath deposition-assisted drying or pre-oxidation or pre-sulfidation, and then a layer of polydopamine is grown on the surface of the cobalt-based precursor to adsorb molybdenum ions, and finally the reaction is annealed in a sulfur atmosphere. During the annealing process, polydopamine is gradually transformed into nitrogen-doped carbon material, and the cobalt-based precursor reacts with sulfur vapor to form cobalt sulfide. At the same time, molybdenum ions are dispersed due to the coordination and adsorption of nitrogen in polydopamine, and are located on the surface of polydopamine and isolated from cobalt elements. Then a molybdenum-doped cobalt sulfide / nitrogen carbon structure is formed. The Co-N-C bond structure formed by the cobalt sulfide / nitrogen-carbon interface in the technical solution of the present invention has good ORR and OER performance; The Mo-N are also highly active centers for OER and ORR, respectively.

The invention discloses an Al-Co-Mo nanocrystal composite material, and a preparation method and application thereof, and belongs to the field of nanometers. The Al-Co-Mo nanocrystal composite material has a heterogeneous structure and good oxygen evolution performance, can efficiently catalyze an oxygen evolution reaction (OER) in a fuel cell. Further, a simple solid-liquid phase solvothermal method is used for controllably synthesizing the Al-Co-Mo nanocrystal such that the method is simple in process and good in process controllability , meets the standards of industrial production, is suitable for mass production, and has important guiding significance on the technical development of renewable energy.

The embodiment of the present application provides an oxygen evolution reaction catalyst, preparation, application, electrolysis device and seawater cracking method. The oxygen evolution reaction catalyst comprises a foamed nickel substrate and amorphous / nanocrystalline basic iron carbonate supported on the foamed nickel substrate. The amorphous and nanocrystalline mixed structure of basic iron-nickel carbonate (FeNiCH) contains more surface adsorbed oxygen and oxygen vacancies, which may modulate the electronic structure of Fe(III) / Ni(II) and optimize the OER intermediate of adsorption energy. And the surface adsorbed oxygen and deficient oxygen may be related to its resistance to chloride and high corrosion resistance. Therefore, the electrocatalytic OER performance of the above-mentioned oxygen evolution reaction catalyst is less affected by chloride ions, and the electrolytic cell can still maintain its high performance when applied to the electrolytic cell for a long electrolysis time, and its performance in the electrolysis of alkaline offshore seawater Exhibits excellent OER performance and can meet high current density (≥500mA / cm 2 ) and low overpotential ≤ 300mV requirements.