5results about How to "Increase intrinsic activity" patented technology

This invention discloses a nickel-molybdenum hydrogen evolution electrode based on a surfactant complex, its preparation method, and its application, belonging to the field of water electrolysis for hydrogen production technology. The preparation method includes: pretreating a nickel mesh substrate and using it as the cathode for electrodeposition in an electroplating solution containing nickel salt, molybdate, complexing agent, and a complexed surfactant; the complexed surfactant consists of at least one anionic surfactant and at least one cationic surfactant. This invention, by introducing a complex system of anionic and cationic surfactants into the electrodeposition solution, synergistically regulates the electrocrystallization process, effectively refining the grains of the nickel-molybdenum alloy catalyst layer, increasing the number of active sites, and significantly reducing the hydrogen evolution overpotential. The electrode prepared by this method achieves a hydrogen evolution overpotential of 100 mA / cm². 2 At the specified current density, the overpotential can be as low as 92.8 mV, and it exhibits excellent stability. This method is simple, low-cost, and reproducible, making it suitable for large-scale preparation of high-performance water electrolysis hydrogen production cathodes.

The application discloses a ruthenium-based ammonia synthesis catalyst, a preparation method thereof and application of the catalyst in catalytic synthesis of ammonia. The ruthenium-based ammonia synthesis catalyst comprises a high-entropy oxide carrier and a ruthenium active component supported on the carrier; the high-entropy oxide is a single solid solution phase formed by oxides of at least three of Mg, Ca, Sr and Ba and at least two of La, Ce, Pr, Nd and Sm. The preparation method comprises the following steps: mixing soluble salts corresponding to each metal constituting the high-entropy oxide with an organic foaming agent in water, evaporating and concentrating to form a gel, heat-treating the gel at 110-150 DEG C to make the gel foam, and obtaining a porous and fluffy solid precursor; grinding the solid precursor and performing joule heating treatment in a non-oxidizing atmosphere, instantaneously heating the solid precursor to 600-1200 DEG C within 10 seconds, keeping the temperature for 1-10 seconds, and then cooling to obtain the high-entropy oxide carrier; and supporting the ruthenium active component on the high-entropy oxide carrier to obtain the ruthenium-based ammonia synthesis catalyst.

This invention relates to a C x N y This invention relates to a Pt@C fuel cell catalyst and its preparation method, belonging to the field of fuel cell catalyst technology. First, Pt@C is synthesized via a solvothermal reaction using ethylene glycol reduction. Then, it is mixed with a nitrogen-containing polymer material and cobalt chloride hexahydrate, and subjected to reduction in a reducing atmosphere, high-temperature treatment, carbon pyrolysis, and alloying to obtain porous nitrogen-containing carbon-coated Pt@C. x N y @PtCo / C catalyst. In the prepared catalyst, the porous coating layer significantly reduces the poisoning of catalyst particles by resin during fuel cell operation, improves cell activity, and extends cell life, exhibiting excellent activity and durability.

This invention relates to the field of fuel cell catalytic materials technology, specifically to a Pt anti-reverse electrode catalyst supported on molybdenum-ruthenium oxide for fuel cell anodes and its preparation method. The catalyst uses molybdenum-ruthenium oxide with a loose, porous structure as a support, and highly dispersed Pt nanoparticles as the active component, wherein Ru (Ru) serves as the active site for the oxygen evolution reaction (OER) under reverse electrode conditions. The method first utilizes a glucose blowing method and urea pyrolysis process to prepare a nitrogen-doped molybdenum-ruthenium oxide support through two-stage heat treatment under an oxidizing atmosphere. Subsequently, Pt nanoparticles are uniformly loaded onto the support surface using a polyol reduction method under an alkaline environment and an inert atmosphere. This invention utilizes the unique support structure and the OER activity of Ru to efficiently catalyze the OER reaction during anode reverse electrode conditions, suppressing excessive anode potential rise, thereby avoiding carbon support corrosion, protecting the integrity of the catalyst layer structure, and improving the durability and service life of proton exchange membrane fuel cells.

This invention discloses an indium oxide nanocrystal material and its preparation method, as well as a catalyst and its preparation method. The indium oxide nanocrystal material exhibits a sheet-like morphology with a size of 5-20 nm and a thickness of 2-5 nm. The preparation method of the indium oxide nanocrystal material is as follows: Under an air atmosphere, a solution containing an indium source and a reducing agent with a volume ratio of 0.3-0.4:10-20 and a molar ratio of 0.00075:1-0.0869:1 is reacted at a temperature of 140-220ºC for 4-48 hours to obtain the indium oxide nanocrystal material. This invention relates to the development of indium-based catalysts with higher activity, reducing the overpotential of formate formation, broadening the potential window for highly selective formate production, and improving the energy efficiency of ECO2RR.