7results about How to "Improve reaction kinetics" patented technology

This invention relates to the field of hafnium carbide technology and discloses a thermal decomposition preparation process for hafnium carbide precursors. The process includes: dissolving hafnium tetrachloride in anhydrous ethanol, adding propylene oxide dropwise for neutralization and acid removal to obtain a neutral ethanol-hafnium precursor solution; adding ethyl acetoacetate methacrylate and heating for coordination to obtain a hafnium coordination monomer solution; adding acrylonitrile and an initiator and heating for polymerization; when the viscosity of the reaction solution increases, injecting a dimethyl sulfoxide hot solution of melamine as a locking liquid; precipitating, separating, and drying to obtain the hafnium carbide precursor; and after oxidative crosslinking treatment, calcining at high temperature under an inert atmosphere to undergo carbothermic reduction to obtain hafnium carbide powder. This invention achieves molecular-level dispersion of precursor components through liquid-phase coordination and in-situ network locking, effectively reducing the reaction temperature and inhibiting grain agglomeration, thus producing high-purity, ultrafine hafnium carbide powder.

This invention belongs to the field of material surface treatment technology, specifically relating to a wafer polishing slurry, its preparation method, and its application. The wafer polishing slurry comprises abrasives, oxidants, dispersants, surfactants, pH adjusters, and water. The components of the wafer polishing slurry work synergistically, shortening polishing time and improving polishing efficiency when applied to wafer polishing. Furthermore, it significantly improves the surface quality of the polished wafer, markedly reducing scratches and defects, and lowering surface roughness to below 0.15 nm, thus meeting the surface quality requirements of fields such as power electronics and radio frequency devices.

This invention discloses Ni2Fe(SO4) 0.5 (OH)6(H2O) 3.85 This paper discusses / NF catalysts, their preparation methods, and applications, belonging to the field of catalyst synthesis technology. Using large-size nickel foam as a substrate, Ni₂Fe(SO₄) is directly prepared through one-step in-situ microwave-driven growth. 0.5 (OH)6(H2O) 3.85 The nanosheet array eliminates the need for subsequent loading or additional processing, simplifying the process and enhancing the bond between the catalyst and the substrate. This catalyst exhibits excellent performance in hydrogen production via water electrolysis, particularly in seawater electrolysis.

The application discloses a nitrogen-doped carbon lithium-sulfur battery positive electrode carrier material with directional pores and iron monatomic anchoring, and a preparation method and application thereof, and belongs to the technical field of lithium-sulfur battery positive electrode materials. Graphene oxide and cellulose nanofibers are dispersed in water to form a dispersion liquid; a mixed metal salt solution prepared by zinc salt and iron salt is added to the dispersion liquid, and a composite hydrogel is formed through electrostatic self-assembly; the composite hydrogel is placed on a pre-cooled metal substrate to perform directional freezing and freeze-drying, and an aerogel precursor with a directional pore structure is obtained; the aerogel precursor is subjected to programmed temperature carbonization with a solid nitrogen source, and a nitrogen-doped carbon lithium-sulfur battery positive electrode carrier material with directional pores and iron monatomic anchoring is obtained. Through the cooperation of directional freezing and gas-phase doping, vertical through pores are constructed, and iron monatomic atoms are anchored, the shuttle effect is inhibited, high specific capacity, excellent rate and long cycle life are realized, and the capacity retention rate reaches 88.5% after 600 cycles at 0.1C.

The application discloses a preparation method of a copper-cobalt-doped carbon nitride electrocatalyst, and a product and application thereof. The copper-cobalt-doped carbon nitride electrocatalyst is prepared by taking 3-amino-1,2,4-triazole as a precursor, 1,10-phenanthroline as a ligand, and a copper source and a cobalt source as metal sources, and has a C3N5 carrier and Cu / Co dispersed in the carrier. The catalyst has rich active sites and excellent conductivity, and through the synergistic effect of copper and cobalt, the hydrogen evolution side reaction is inhibited, and the activity, selectivity and stability of the electrocatalytic reduction of nitrate to produce ammonia are improved. The problems of low activity, low faradic efficiency, poor stability and high cost of the existing electrocatalytic nitrate reduction ammonia catalyst are effectively solved. The preparation method adopts a non-noble metal + non-metal substrate, raw materials are easy to obtain, the preparation process is simple, and the cost is low, and thus the method can realize large-scale production. The obtained catalyst is suitable for the field of electrocatalytic reduction of nitrate to produce ammonia, can realize water nitrate pollutant treatment and high-value ammonia resource recycling, and has dual benefits of environmental protection and economy.

The application relates to a method for preparing a nano-flower-shaped positive electrode material by modifying commercial V2O5, wherein commercial V2O5 is used as raw material, and a metal salt is used as a dopant; the commercial V2O5 and the metal salt are respectively added into deionized water, H2O2 is added after mixing, and continuous stirring is carried out until the solution is changed into a uniform orange-yellow liquid; the solution is transferred into a high-pressure reaction kettle, hydrothermal reaction is carried out, centrifugal separation is carried out, and drying is carried out in a freeze dryer, so that a nano-flower-shaped aqueous zinc ion battery positive electrode material is obtained. The aqueous zinc ion battery positive electrode material prepared by the method has the characteristics of good rate performance, high discharge specific capacity and high cycle stability, provides a feasible path for modification of V2O5 material, and provides a new selection for commercial application of the aqueous zinc ion battery.

This invention discloses a carbon-plastic bipolar plate for a zinc-bromine flow battery, its preparation method, and its application, belonging to the field of electrochemical energy storage technology. The method includes: dispersing nitrogen-doped hollow carbon nanotubes and spraying them onto the positive electrode side of a carbon-plastic bipolar plate; after drying, a nitrogen-doped hollow carbon nanotube-modified positive electrode carbon-plastic bipolar plate is obtained; dispersing boron-nitrogen co-doped carbon and spraying it onto the negative electrode side of a pretreated carbon-plastic bipolar plate, after drying again, a boron-nitrogen co-doped carbon-plastic negative electrode carbon-plastic bipolar plate is obtained. On the positive electrode side, the nitrogen-doped hollow carbon nanotubes catalyze the bromine reaction through nitrogen doping, reducing the overpotential; the hollow structure adsorbs bromine species and uses charge action to inhibit bromine permeation, reducing self-discharge. On the negative electrode side, the boron-nitrogen co-doped carbon uses B-N zinc-loving sites to guide uniform and dense zinc deposition, inhibiting dendrite formation; and inhibits hydrogen evolution through charge regulation. Both methods synergistically improve the bromine barrier performance, reaction kinetics, and dendrite suppression ability of the carbon-plastic bipolar plate.