4results about How to "Increase defect concentration" patented technology

The invention discloses an iron-based MOFs composite electrode and application thereof. The preparation method comprises the following steps: firstly preparing Cu-coated Fe-ZIF powder in a coprecipitation manner, then preparing Fe2O3-coated Cu-coated Fe-ZIF powder by a hydrothermal reaction, step-by-step ultrasonic and vacuum arc method, and then fusing with S at high temperature by a hot melting method; and preparing the active material Fe2O3 (at) Cu (at) Fe-ZIF (at) S for the iron-based MOFs composite electrode. The Fe-ZIF material is selected as a metal frame to coat the surface of Cu, the Fe-ZIF material and Fe oxide are mixed, calcined and subjected to a direct-current vacuum arc method to synthesize the wooden-stick-shaped nanosphere particles, the defect concentration in a Fe2O3 structure can be effectively increased under the synergistic effect of the advantages of Cu-coated Fe-ZIF components, more loading space is provided for subsequent components such as sulfur, and the Fe-coated Fe-ZIF composite material has a good application prospect. The sulfur loading effect is improved, the sulfur utilization rate is improved, the volume change is relieved, and the battery performance is further improved.

The invention provides a preparation method of black titanium dioxide and black titanium dioxide, and relates to the technical field of photocatalytic materials.The preparation method comprises the steps that white titanium dioxide and vanadium pentoxide are evenly mixed to obtain a mixed raw material; uniformly mixing melamine and the mixed raw material according to a mass ratio to obtain intermediate powder; and placing the intermediate powder in a furnace, and calcining in an inert atmosphere to generate black titanium dioxide. The preparation efficiency and safety of the black titanium dioxide can be improved.

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.

The present invention belongs to the technical field of gas-sensitive materials, and relates to a nickel nanocluster modified porous core-shell composite indium oxide material and its preparation method and application. Including indium oxide and metallic nickel, and the molar ratio of indium oxide to metallic nickel is 1: (0-0.2); the crystalline phase of indium oxide is a composite phase composed of a cubic phase and a rhombic corundum phase, and the structure of indium oxide is a porous hollow core-shell micron spherical structure, which is composed of a shell layer wrapping a core, and a hollow cavity is formed between the shell layer and the core, wherein the shell layer is composed of porous indium oxide nanoparticles, and the core is a micron sphere assembled from porous indium oxide nanoparticles; metallic nickel is dispersed on the surface of the porous hollow core-shell micron spherical structure in the form of nanoclusters. The material provided by the present invention can detect transient NO2 at a relatively low operating temperature with high sensitivity, high selectivity, and a wide concentration range, and has excellent practical application value and industrial production prospects.