42results about How to "Preparation high" patented technology

The invention relates to a method for preparing flexible iron sesquioxide / ferroferric oxide and nitrogen doped carbon composite nano-fibers. The method has the advantages that the problem of poor toughness and electric conductivity of existing metal oxide can be solved by the aid of the method; flexible macromolecules are used as supports and are subjected to composition with metal organic gel precursors with plasticity to obtain precursors, and the precursors are subjected to pyrolysis in inert atmosphere and air atmosphere to obtain the flexible iron sesquioxide / ferroferric oxide and nitrogen doped carbon composite nano-fibers which are flexible metal oxide and nitrogen doped carbon composite nano-fibers; the problems of complicated and harsh conditions for preparing flexible metal oxide and carbon composite materials, high costs and difficulty in large-scale production at present can be solved by the aid of the method; raw materials for the flexible iron sesquioxide / ferroferric oxide and nitrogen doped carbon composite nano-fibers are low in cost, processes for preparing the flexible iron sesquioxide / ferroferric oxide and nitrogen doped carbon composite nano-fibers are simple, and the method is short in synthesis period, good in repeatability and high in yield, and industrial production can be facilitated; the flexible iron sesquioxide / ferroferric oxide and nitrogen doped carbon composite nano-fibers can have characteristics of bendable properties and excellent electrochemical performance, accordingly, the method has an extremely broad application prospect in the field of wearable electronic devices, and the like.

The invention discloses a preparation method for a PPy and NCCs compound film electrode material. The preparation method is characterized by comprising the steps of performing pretreatment and hydrolysis on plant raw materials to obtain NCCs from the plant raw materials, mixing the obtained NCCs with pyrrole monomers to form an electrolytic solution, and obtaining the PPy and NCCs compound film electrode material through preparation by an electrochemical method. According to the preparation method, the PPy and NCCs compound film electrode material with the electrochemical property enhanced is obtained by using cheap plant raw materials or even waste plant raw materials; the preparation method is fast and environmentally friendly, mild in synthesis condition and low in cost. The preparation method can also be broadened to be applied to preparation of various conductive polymer composite materials, such as polyaniline, polyacetylene, polythiophene and poly-phenylene vinylene.

The invention discloses a core-shell structure palladium-copper catalyst and a preparation method thereof and catalytic application thereof, and belongs to the field of nanocatalysis. The core-shell structure palladium-copper catalyst comprises a palladium nanosheet and a copper shell layer coating the surface of the palladium nanosheet, wherein the palladium nanosheet has a size of 5 to 200 nm and a thickness of 0.5 to 3 nm; and the thickness of the copper shell is 0.1 to 10 nm. The palladium nanosheet is dispersed in water, hydrogen gas is introduced, after the reaction, an aqueous solutioncontaining copper ions is added, and sealing reaction is continued to obtain the core-shell structure palladium-copper catalyst. An catalytic application method is as follows: the core-shell structurepalladium-copper catalyst is collected by centrifugation, washed with ethanol and dried to obtain catalyst powder; the catalyst powder is dispersed in ethanol, phenylacetylene is added to a water bath and stirred, and H2 is introduced to react.

The invention discloses an activated carbon fiber used for a supercapacitor and a preparation method thereof, comprising: (1) using concentrated sulfuric acid to carry out hydrophilic finishing on the activated carbon fiber; (2) sequentially washing the activated carbon fiber with ethanol, acetone and deionized water (3) Prepare manganese acetate solution and ammonium acetate solution, then add dimethyl sulfoxide solution and mix evenly to obtain a precursor solution; (4) Immerse the activated carbon fiber in step (2) in the precursor solution, and use electric Manganese dioxide nanomaterials are deposited on the surface of activated carbon fibers by chemical deposition; (5) After the reaction is completed, the products are washed with ethanol and deionized water, dried, and calcined to obtain the product. The process of the invention is simple, economical and high in production efficiency; needle-like manganese dioxide nano-arrays can be obtained, which are uniformly distributed radially on the surface of activated carbon fibers, and can be prepared in a large area without templates; and have excellent electrochemical properties, and have great application prospects broad.

The invention belongs to the technical field of inorganic porous materials and catalysts, in particular to a zeolite molecular sieve-mesoporous titanium oxide composite material with a high specific surface area egg yolk-eggshell structure and a preparation method thereof. The composite material uses zeolite molecular sieve materials as egg yolk, and mesoporous titanium dioxide nano crystal grain aggregates as eggshell, and there is a cavity with adjustable size between the zeolite molecular sieve and mesoporous titanium dioxide. The preparation method is to wrap a layer of phenolic resin macromolecule or amorphous silica on the surface of zeolite molecular sieve, and then wrap a layer of amorphous titanium dioxide, convert the titanium dioxide into crystalline titanium dioxide nanocrystals by calcining, and finally remove the phenolic resin polymer layer or amorphous silica to obtain the target composite material; the method is simple and the control is easy. The composite material has a multi-level porous structure and can be used as a catalyst or catalyst carrier for continuous reactions, and can also be used as an adsorption-catalysis composite material.