5results about How to "Increase catalytically active sites" patented technology

The invention discloses a bimetallic asymmetric reduction Schiff base catalyst for synthesizing ethylene carbonate and a preparation method of the bimetallic asymmetric reduction Schiff base catalyst. According to the catalyst, a diamine compound is subjected to selective single-side protection, the imine reduction position is controlled, and a bimetallic active center is introduced; the controllable synthesis of a product for reducing the outer side imine and a product for reducing the inner side imine is realized; the obtained product is recrystallized to obtain a monoimine-monoamine type ligand with a clear asymmetric structure, the monoimine-monoamine type ligand and metal salt form a bimetallic catalyst, and the catalyst generates a synergistic effect through double active sites and shows high catalytic activity and excellent product selectivity.

The application discloses a cobalt hydroxide nanosheet / metal cobalt catalyst and a preparation method and application thereof, and belongs to the technical field of cobalt-based electrocatalysts. The preparation method comprises the following steps: taking pretreated porous foam metal cobalt as a substrate, and performing self-corrosion reconstruction in an alkaline nitrate aqueous solution to in-situ grow cobalt hydroxide nanosheets, so as to obtain the cobalt hydroxide nanosheet / metal cobalt catalyst. The preparation method is simple in operation, the synthesized catalyst can be directly used as an electrode, the high conductive characteristics of the metal substrate are maintained, the effective connection between the nanosheet and the substrate can be realized, and the catalytic active sites are increased. The catalyst can be applied to the efficient electrocatalytic synthesis of ammonia.

The invention relates to the technical field of composite material preparation, in particular to a Pd-coated ZIF-8 / CQDs / FeHCF ternary composite film gas sensitive material as well as a preparation method and application thereof. ZIF-8 in the ternary composite film gas-sensitive material provides a high specific surface area and a regular microporous framework, and is used for preliminary adsorption and enrichment of VOCs molecules; pd nano-particles are uniformly distributed inside and outside ZIF-8 pore channels, high catalytic activity sites are provided, and activation and reaction of toluene molecules are accelerated; the CQDs construct a rapid electron transport network, so that the interface conductivity is remarkably improved; feHCF is used as a Prussian blue analogue, so that the mechanical stability and the moisture resistance of the film are enhanced, and a multi-phase interface is provided. According to the Pd-coated ZIF-8 / CQDs / FeHCF ternary composite film gas-sensitive material disclosed by the invention, an adsorption-catalysis-electric conduction three-in-one multi-phase composite strategy is adopted, the bottlenecks of a traditional sensor gas-sensitive material in specific surface area, electric conductivity and stability are broken through, a brand new implementation path is provided for rapid detection of ppb-level VOCs (Volatile Organic Compounds) represented by methylbenzene, and the gas-sensitive material has a wide application prospect. And the method has good expansibility and industrialization potential.

The application discloses a preparation method of single-atom modified porous carbon material and application of the single-atom modified porous carbon material in lithium-sulfur batteries. The preparation method comprises the following steps: preparing zinc-based metal organic framework material Zn-MOF nanoparticles; coating phenolic resin (RF) on surfaces of the Zn-MOF nanoparticles to obtain Zn-MOF-RF nanoparticles; adsorbing X metal salt on the Zn-MOF-RF nanoparticles by using a solution immersion method; and obtaining X single-atom loaded hollow nitrogen-doped porous carbon (X-N / HNPC) composite material by high-temperature carbonization under an inert atmosphere. The composite material has a large specific surface area and rich pore size structure, and as a positive electrode material, can not only improve the utilization rate of active material sulfur, but also effectively adsorb polysulfides by high catalytic active sites, improve redox reaction kinetics, and further inhibit the shuttle effect of polysulfides. Based on the lithiumophilicity of metal single atoms, as a lithium negative electrode carrier, the lithium uniform deposition can be regulated, the growth of lithium dendrites can be relieved, and the stability of the battery can be improved.

The present application belongs to the technical field of photoelectrochemical hydrogen production, and discloses a P-doped nickel layered double hydroxide cocatalyst heterojunction photoanode and a preparation and application thereof. The P-doped nickel layered double hydroxide cocatalyst heterojunction photoanode comprises a Si substrate, an InN nanocolumn layer arranged on the Si substrate, a PM6 layer arranged on the surface of the InN nanocolumn, and a P-doped Ni LDH cocatalyst layer arranged on the surface of the PM6 layer. The present application further discloses a preparation method of the photoanode. In the photoanode, the P-doped Ni LDH cocatalyst not only increases the catalytic active sites of the reaction and reduces the activation energy required for HER, but also effectively reduces the onset potential of the heterojunction photoanode, promotes the dissociation, transport and reduction reaction of the photo-generated carriers at the electrode / electrolyte interface. The photoanode is used for photoelectrochemical water splitting to produce hydrogen, and solves the problems of high onset potential and low photoelectric conversion efficiency in the hydrogen production process.