34results about How to "Control microscopic morphology" patented technology

The invention relates to the field of battery manufacturing and energy storage, in particular to a preparation method for an all-vanadium redox flow battery electrode material. The preparation method comprises the steps of taking alkaline lignin as a test material, partially substituting the hydroxymethylation alkaline lignin by a phenolic hydroxyl active functional group in an alkaline lignin structure, synthesizing organic gel from resorcinol and formaldehyde under the effect of a catalyst, preparing a precursor spinning liquid required for an experiment by taking the gel as a precursor, preparing a fiber precursor electrode material by an electrostatic spinning method, pre-oxidizing the electrode material precursor by a vacuum / atmosphere furnace, and performing carbonization in an inertia atmosphere to obtain the carbon fiber electrode material. In the vanadium battery carbon fiber electrode material prepared by the method, the fiber diameter is in nanoscale, and the specific area is greatly expanded compared with a traditional carbon felt electrode material; and due to pre-oxidization processing in post period, the oxygen content of the fiber surface is also greatly improved, and the method can be used for preparing the vanadium battery carbon fiber electrode material.

The invention provides an alkali cobalt phosphate nanoneedle-containing composite LTON photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps: firstly, synthesizing LaTiO2N by a polymerization complexation method and a high-temperature ammonia gas posttreatment means; then, growing Co3(OH)2(HPO4)2 nanoneedles on the LaTiO2N in situ by a hydrothermal method to obtain a target product. The alkali cobalt phosphate nanoneedle-containing composite LTON photocatalyst prepared by the preparation method provided by the invention has special morphology, and special heterojunctions are established between the LaTiO2N and the Co3(OH)2(HPO4)2 nanoneedles, so that compared with pure LaTiO2N, the LaTiO2N photocatalyst compounded with the Co3(OH)2(HPO4)2 nanoneedles has better catalytic oxygen production performance under visible light, and improvement on the catalytic oxygen production performance of the pure LaTiO2N under visible light is achieved.

The invention relates to a method for preparing a nanometer composite particle for electromagnetic shielding. The method for preparing the high electric and magnetic conduction nanometer composite particle for electromagnetic shielding is characterized in that the method comprises the following steps: 1) material selection; 2) ferrite and nickel salt are mixed, added with polyethylene glycol and cyclohexane, then added with water and are stirred and dispersed to obtain a mixed solution; 3) the mixed solution is added with a strong reducer at a temperature of between 25 and 90 DEG C, reacts for 5 to 60 minutes under alkali condition with PH value of between 9 and 13, is cooled to normal temperature, and is washed and dried to obtain FeNi alloy nanometer particles; and 4) the FeNi alloy nanometer particles are added into anhydrous ethyl ethanol, added with a weak reducer, subjected to ultrasonic dispersion for 30 to 60 minutes, then added with a silver ammonia solution, stirred at a temperature of between 25 and 90 DEG C, react for 0.5 to 2 hours, cooled to normal temperature and are washed and dried to obtain the high electric and magnetic conduction nanometer composite particle for electromagnetic shielding. The method has the advantages of simple process, environmental protection, low production cost and high yield; and the product has excellent magnetic and electric conduction performances.

The invention discloses an NH2-rGO / MnO2 composite material, a preparation method and an application thereof. Graphite oxide GO is prepared and the prepared graphite oxide is processed into an aqueoussolution; the aqueous graphite oxide solution and dimethyl formamide are stirred in a water-bath manner, p-phenylenediamine is added into the solution for reaction, the temperature rises, backflow stirring is carried out, an obtained reactant is washed by ethyl alcohol and deionized water until supernate becomes colorless and neutral, an obtained precipitate is dispersed into the deionized water,and then an aminated reduced graphene oxide NH2-rGO solution is obtained; and according to a hydrothermal method, potassium hypermanganate KMnO4 and the prepared NH2-rGO solution are mixed and stirredand then ultrasonic processing is carried out, the mixture is transferred to a reaction still, so that an NH2-rGO / MnO2 composite material is prepared. According to the invention, the prepared aminated graphene enables the conductivity of the manganese dioxide to be improved; because of the amino existence, the electrochemical activity of the material is enhanced and the infiltration property withthe electrolyte is improved; the microscopic appearance of the manganese dioxide can be improved; the specific surface area is increased; the dispersion of the materials is enhanced; and the performance of the super-capacitor is improved.

The invention discloses a method for synthesizing boron and nitrogen co-doped graphitized nano-carbon by using ion-exchange resin, which relates to a synthetic method of boron and nitrogen co-doped graphite carbon. According to the method, the problem of incapability of implementing industrial production caused by complex preparation technologies, harsh reaction conditions, uncontrollable microstructures of products, uncontrollable contents of boron and nitrogen, low yield and high cost of the boron and nitrogen co-doped graphite carbon is solved. The method comprises the following steps of: (1) pre-treating the ion-exchange resin; (2) coordinating functional ions and the ion-exchange resin; (3) pre-carbonizing; (4) heat-treating; and (5) inducing acid reflux and deionized water washing, and drying to acquire the boron and nitrogen co-doped graphite carbon. The microstructure of the boron and nitrogen co-doped graphite carbon acquired by the invention is controllable, the contents of boron and nitrogen are controllable, and the conductivity is good; and meanwhile, the preparation technologies are simple, the microstructure of the product is controllable, the contents of boron and nitrogen are controllable, the yield is high, and the cost is low. The method can be applied to the field of the storage and conversion of energy.

The present invention provides a method for preparing soft magnetic metal iron porous micro-wires. The present invention adopts divalent iron salt as raw material and anhydrous ethanol, isopropanol and ethylene glycol as solvent to prepare soft magnetic wire by solvothermal reduction method. Metal iron porous microwires. The method obtains iron micro-wires with different lengths, different diameters and different pore sizes by controlling factors such as reaction temperature, reaction time, reactant concentration, ligand and solvent types. The method for synthesizing the soft magnetic metal iron porous micrometer wire in one step requires simple equipment, simple preparation process and low production cost. The invention provides a new method for preparing soft magnetic metal iron porous micro-wires.

The invention belongs to the technical field of metal solid catalysts, and discloses a lignin-based nanoflower porous carbon carrier-supported Ru-based catalyst as well as a preparation method thereofand an application of the catalyst in lignin depolymerization. The preparation method comprises the following steps: lignin is used as a carbon source, magnesium oxide is used as a template agent, and a mixed solution system containing the lignin and the magnesium oxide is treated by utilizing microwaves to obtain a lignin and magnesium oxide precursor complex; and high-temperature calcination isperformed to obtain a lignin-based nanoflower porous carbon carrier, and an active component Ru is supported by using an impregnation method to prepare the lignin-based nanoflower porous carbon carrier-supported Ru-based catalyst. The obtained catalyst provided by the invention has a structure which is composed of a large number of irregular pleated nanoflowers and has developed pore channels andthe characteristics of smaller supported ruthenium nanoparticles (1.5-6 nm), a large specific surface area (5-180 m<2> / g), high dispersity and high stability, can be applied to the lignin depolymerization and exhibit excellent activity, and has a monophenol yield of 26.8% and good cycle stability.