10results about How to "Good activity and stability" patented technology

This invention provides a self-supporting one-dimensional nanorod array composite material, its preparation method, and its application, belonging to the field of clean energy harvesting technology. The preparation method provided by this invention includes the following steps: mixing soluble nickel salt, soluble molybdate, and water, and carrying out a hydrothermal reaction to obtain a NiMo precursor; heat-treating the NiMo precursor and a modifier under a protective atmosphere to obtain the self-supporting one-dimensional nanorod array composite material. Experimental results show that the composite material prepared by the method provided by this invention has excellent electrocatalytic water splitting activity and operational stability, and photo-assisted synthesis further enhances the electrocatalytic water splitting activity of the composite material, making it applicable to solar-driven electrocatalytic water splitting.

The invention relates to the technical field of high-activity metal powder, in particular to high-environmental-stability aluminum-lithium alloy powder and a manufacturing method and application thereof.The high-environmental-stability aluminum-lithium alloy powder comprises, by weight, 1.0-10.0 wt.% of Li, 1.0-10.0 wt.% of Al, 1.0-10.0 wt.% of Ti, 1.0-10.0 wt.% of Ti, 1.0-10.0 wt.% of Ti, 1.0- 0.1 to 5.0 wt.% of Zr; 0.01 to 2.0 wt.% of Ti; 0.05 to 3.0 wt.% of RE; wherein RE is a rare earth element and at least comprises Y, Ce, La or a combination thereof, the sum of Zr, Ti and RE does not exceed 8.0 wt.%, and the balance is Al and inevitable impurities. The method has the effect of improving the use stability and the machining consistency of the aluminum-lithium alloy powder.

The invention relates to a catalyst for hydrogen production through seawater electrolysis based on a metal ruthenium-doped copper nanowire composite structure and a synthesis method thereof, and belongs to the technical field of catalysis, the catalyst is composed of a copper nanowire skeleton derived from foamy copper and metal ruthenium clusters uniformly distributed on the surface of the copper nanowire skeleton; the method comprises the following steps: placing foamy copper in a solution containing sodium hydroxide and an oxidizing agent to generate a copper hydroxide nanowire; metal ruthenium is introduced by dipping in a solution containing ruthenium salt; and carrying out inert atmosphere heat treatment and electrochemical reduction to obtain the ruthenium-cluster-loaded copper nanowire composite catalyst. The fine regulation and control of the structure and components of the catalyst are realized by adjusting the concentration of the reaction solution, the dipping time and the treatment conditions. The electrocatalyst shows excellent hydrogen evolution activity and long-term stability under the acidic seawater electrolysis condition, the problems that a nickel-based current collector is prone to corrosion in an acidic medium and a traditional platinum-based catalyst is prone to inactivation in natural seawater are effectively solved, and a new technical scheme is provided for efficient and stable seawater electrolysis hydrogen production.

The application relates to a high-entropy alloy carbon nanofiber material and a preparation method and application thereof. The preparation method of the high-entropy alloy carbon nanofiber material comprises the following steps: S1. polyacrylonitrile is prepared into first spinning liquid, electrostatic spinning is carried out, and first nanofiber film is prepared; S2. polyvinylpyrrolidone, a cobalt source, a nickel source, a copper source, a zirconium source and a metal M source are prepared into second spinning liquid, the second spinning liquid is electrostatically spun, the formed second nanofiber film is covered on one face of the first nanofiber film, and a composite nanofiber film is obtained; and S3. the composite nanofiber film is subjected to pre-oxidation and carbonization treatment, and the high-entropy alloy carbon nanofiber material is obtained. The high-entropy alloy carbon nanofiber material has good flexibility and good hydrogen evolution catalytic performance brought by high content of active substances, and the preparation method does not need to use noble metals as raw materials.

A C-terminal truncated alginate lyase and its application. This invention belongs to the fields of bioengineering, genetic engineering, and enzyme engineering, and relates to a C-terminal truncated alginate lyase TY2 designed with molecular docking assistance, its encoding gene, recombinant vector, strain, and its application in the preparation of low-polymerization degree alginate oligosaccharides. Using wild-type MhAly6 as the parent, the truncation boundary was determined through structural prediction and molecular docking. A portion of the linker peptide was retained, and the C-terminal GH28 family domain was deleted to obtain the truncated form TY2. TY2 has approximately twice the specific activity of the wild-type enzyme, and even higher residual activity after incubation at 45°C for 1 hour, achieving a synergistic improvement in catalytic activity and thermal stability. + The relative enzyme activity reached 4.3 times that of the control group, which can degrade pretreated Sargassum powder. The product is mainly ΔDP2–ΔDP4 low-polymerization brown algae oligosaccharides, which are suitable for related enzymatic degradation and oligosaccharide preparation.

The invention belongs to the technical field of gene engineering, and particularly relates to a 3-ketosteroid-delta1-dehydrogenase mutant with improved heat resistance and an application of the 3-ketosteroid-delta1-dehydrogenase mutant. The 3-ketosterone-delta1-dehydrogenase AuKsdD gene derived from arthrobacter urate oxydans is subjected to structural analysis and site-directed mutagenesis design, and a mutant with higher catalytic activity and remarkably enhanced heat resistance compared with a wild type AuKsdD is obtained through directed mutation of key sites E244, K267, T301 and A335. The mutant can keep high catalytic efficiency for a long time under a high-temperature condition, and is suitable for industrial synthesis of steroid drug raw materials.

The application relates to the technical field of inorganic materials, in particular to a sulfur-defect-rich CuS and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing CuS, a dispersing agent and an organic sulfur source in the presence of a solvent to form a slurry; S2, performing wet ball milling on the slurry, performing solid-liquid separation, taking the solid, washing and drying to obtain a precursor; S3, annealing the precursor under vacuum to obtain the sulfur-defect-rich CuS; wherein the wet ball milling process adopts intermittent ball milling at a rotating speed of 400-600 r / min for 2-4 h. Through the above wet ball milling, sulfur source induction and vacuum heat treatment steps, the sulfur-defect-rich CuS can efficiently remove selenium in wastewater.

The invention relates to the technical field of electrochemistry, in particular to a ruthenium / nickel-iron alloy co-embedded carbon fiber material and a preparation method and application thereof. The ruthenium / nickel-iron alloy co-embedded carbon fiber material catalyst is prepared through an electrostatic spinning-carbonization-reduction method, firstly, nanofibers are obtained through electrostatic spinning, active substances can be embedded into the carbon nanofibers through the electrostatic spinning technology, agglomeration of nanoparticles is effectively inhibited, meanwhile, corrosion resistance is improved, and the catalyst is used for preparing the carbon fiber material. The preparation method comprises the following steps: firstly preparing carbon nanofibers, then performing high-temperature carbonization to obtain Ni3Fe-CNFs, enabling the carbon nanofibers to have good electrical conductivity, facilitating electron transfer and charge transfer, and finally loading Ru onto the surfaces of the carbon nanofibers by adopting a sodium borohydride reduction method, so that the HER reaction process is greatly accelerated.

The invention discloses a high-entropy perovskite supported catalyst as well as a preparation method and application thereof. The catalyst comprises a perovskite carrier and iridium nanoclusters dispersed on the perovskite carrier, wherein the perovskite carrier is a high-entropy perovskite carrier of which the B site is occupied by five different transition metal elements, and the five different transition metal elements comprise Ir, Ti, Ni, Co and Mo; the mass ratio of the iridium nanocluster to the perovskite carrier is (0.6-1): 1; the catalyst has a rooting structure in which an active component iridium element is simultaneously distributed in a perovskite bulk phase and an iridium nanocluster. The prepared rooting type high-entropy perovskite carrier supported iridium catalyst shows good catalytic activity and catalytic stability in proton exchange membrane water electrolysis equipment, and the problem that iridium active species in a proton exchange membrane water electrolysis anode supported catalyst are prone to agglomeration and falling off under the reaction condition is effectively solved.

The application belongs to the field of OER catalysis, and specifically discloses a preparation method of a perovskite-based composite catalyst of surface in-situ desolventized cobalt-iron-nickel ternary alloy nanoparticles. 1‑x BO 3‑δ The perovskite precursor material with a structural formula of A 1‑x BO 3‑δ , wherein A is an alkaline earth or rare earth metal element, B includes Co, Fe and Ni, and 0.85<=x<1. The application also includes the catalyst prepared by the preparation method and OER catalytic application thereof. The preparation method can be used for preparing a material with special physicochemical properties and structure and excellent OER catalytic activity.