786results about How to "Fast preparation method" patented technology

The invention discloses a preparation method of a multilayer sandwich type electrostatic-spinning polymer nanofiber composite membrane. The preparation method comprises the steps of firstly, spinning a polymer spinning liquid into a fiber membrane in an electrostatic manner, then spraying a spraying liquid containing inorganic nano-particles to the surface of the electrostatic-spinning fiber membrane by virtue of a jetting technique, continuously spinning the fiber membrane, and repeatedly carrying out the steps according to specific conditions so as to prepare the multilayer sandwich type composite membrane. As the inorganic nano-particles are adhered to the surface of the fiber membrane, not only can the ultrahigh specific area and the specific structural advantage of a nanofiber be brought into full play, but also the selectable ranges of the spraying liquid and the polymer spinning liquid are flexible, so that spraying liquids containing different inorganic nano-particles can be sprayed to electrostatic-spinning fiber membranes made from different raw materials according to actual demands so as to prepare sandwich type composite membranes with different functions, stable structures and good properties, and the application range of the electrostatic-spinning polymer nanofiber composite membranes is expanded.

The invention provides a preparation method for an all-solid-state battery. The method comprises the steps of S1, mixing lithium salt, additive and initiator to obtain mixed solution, wherein the additive is micromolecule monomer comprising unsaturated bond; and S2, carrying out in-situ polymerization and adhesion by the solution in a cathode layer, a solid electrolyte layer and an anode layer andamong the layers, thereby obtaining composite solid electrolyte, wherein a solid electrolyte layer comprises inorganic solid electrolyte and adhesive. Compared with the prior art, the method has theadvantages that through utilization of flowability of the micromolecule monomer additive comprising the unsaturated bond, solid particles are wetted sufficiently, ion transport channels are constructed through in-situ polymerization and solidification, electrode layers are adhered once, and a battery is moulded; the compatibility of the solid-solid interface in the all-solid-state battery can be effectively improved; and the preparation method is simple and fast, is compatible with the existing battery technology and is beneficial for large-scale preparation.

The invention relates to an electronic map, in particular to an electronic map provided with roadside panoramic view picture strips, a method for manufacturing the same, and a method for marking interested places. The invention is dependent on road information of the prior electronic map and the correlation between the road information and the panoramic view picture strips for the overlay of the panoramic view picture strips showing both roadsides on roads displayed on the electronic map. Each panoramic view picture strip is a narrow picture which records all the scenes on a section of road, and users can comprehensively, continuously and intuitively know the conditions on both sides of a street through the panoramic view picture strip and determine the actual position of a place in the panoramic view picture strip on the electronic map.

The invention belongs to the technical field of high-polymer materials, and particularly relates to a polypropylene (PP) electret master batch material, a method for preparing the same and applicationof the polypropylene electret master batch material. The PP electret master batch material is mainly prepared from components including, by weight, 50-100 parts of polypropylene, 8-50 parts of electret agents, 0-3 parts of compatibilizers, 0.05-0.35 part of antioxidants and 0-3 parts of anti-aging agents. The components are molten and granulated to obtain the polypropylene electret master batch material. The polypropylene electret master batch material, the method and the application have the advantages that resin and auxiliaries are uniformly mixed with one another in melt blending modes, accordingly, obvious electret effects can be realized by melt-blow non-woven materials produced from the polypropylene electret master batch material prepared by the aid of the method, the melt-blow non-woven materials are high in filter efficiency and low in filter resistance, and the like.

The invention discloses normal-temperature processed cheese and a preparation method thereof. The normal-temperature processed cheese comprises the following components in percentage by weight: 0 to 15 percent of natural cheese, 10 to 25 percent of fat product, 10 to 33 percent of other milk solid substance except the natural cheese and the fat product, 4 to 12 percent of starch, 0.6 to 2.7 percent of stabilizer, 3 to 7 percent of plant protein, 0.1 to 0.2 percent of antioxidant, 1 to 1.8 percent of emulsifying salt and 25.8 to 40 percent of water. The normal-temperature processed cheese can keep the original characteristic flavor and functional properties in normal-temperature shelf life.

The invention provides metal ion modified black phosphorus as well as a preparation method and an application of the metal ion modified black phosphorus. The preparation method comprises the following steps of placing black phosphorus raw materials in a metal ion organic solution, performing impregnating under the temperature of 0-50 DEG C for 5min to 2h, and then performing blow-drying under protective gas so as to prepare the metal ion modified black phosphorus. The invention further provides the metal ion modified black phosphorus prepared by the preparation method, and the application of the metal ion modified black phosphorus in thin-film transistor materials, battery negative electrode materials, flexible display materials, light emitting diode materials, optical switch materials and biosensor materials. The metal ion modified black phosphorus provided by the invention can utilize the metal ions to improve the structural stability and the property stability of the black phosphorus in the existence of water and oxygen gas under the condition of being not changing the intrinsic attributes of the black phosphorus, so that the antioxidant ability of the black phosphorus is improved.

The invention discloses an aptamer-based microfluidic chip capable of capturing cancer cells, which is formed by reversibly sealing an upper-layer polymer chip and a lower-layer slide carrier, wherein a cell capturing channel is arranged between the upper-layer polymer chip and the lower-layer slide carrier; the bottom surface of the channel is rough; and avidin is fixed on the bottom surface. The preparation of the microfluidic chip comprises the steps of making a chip die by photoetching, and casting to obtain a polymer chip; processing the slide carrier with hydrofluoric acid and bonding with the polymer chip; and fixing avidin in the cell capturing channel to obtain a microfluidic chip. The microfluidic chip disclosed by the invention can be used for separating cancer cells; and the separation comprises the steps of adding biotin-modified aptamer into a sample, and incubating; and leading the mixed solution after the incubation into the microfluidic chip, wherein the target cancer cells in the mixed solution are combined with the avidin through the biotin to realize separation of the target cancer cells. The microfluidic chip disclosed by the invention has the advantages of high cell capturing efficiency, convenience in operation, strong generality, low cost and the like.

The invention provides a preparation method of a noble metal-graphene nanometer composite, which comprises the steps of: oxidizing powdered graphite to prepare graphene oxide by oxidizing potassium permanganate; dispersing the graphene oxide in water; ultrasonically stripping a dispersed graphene oxide piece which is formed in water solution; reducing the graphene oxide piece with hydrazine hydrate under the existence of surface active agent to obtain graphene water solution which can be stably dispersed in water phase; centrifugally concentrating the graphene water solution; adding noble metal prodromic salt and electrolyte salt into surface active agent-containing water solution; adding water phase-dispersed graphene in proportion; adjusting PH value; reacting by means of ultrasonic electrochemistry under the density of the constant current and the intensity of ultrasound; centrifugally separating with high speed; and washing with ultrapure water to prepare the noble metal-graphene nanometer composite. The method has the advantages of convenience, speediness and controllability, etc. The prepared graphene nanometer composite has good dispersibility in water, can be stably existed for a long term, and has good electro-catalysis redox characteristic to organic matter.

The invention relates to the field of nano materials, and discloses the nano material and application of the nano material, and a method and a device for preparing the nano material. The nano material comprises a nano fiber, wherein at least two micro nano knots are arranged on the nano fiber and are formed by reuniting at least one micron or nano particle; and the nano material is mainly prepared by adding the micron or nano particles into a spinning polymer solution or a solvent by electrostatic spinning or plasma spinning. The nano material has a structure similar to a dumbbell; the integration degree and the performance of a device made of the nano material can be improved; when the device is used as an electric appliance, the charge conveying can be improved; the materials of the nano knots of the nano material can be controlled; the nano material can be designed to be a heterojunction or PN knot device; and the contact resistance of the electronic device can be effectively reduced. The nano material is suitable for the field of energy storage and power battery materials and devices, solar materials and devices, composite materials, sensors, transistors and the like.

The invention relates to a method for preparing a reduced-oxidized graphene / Fe3O4 / Ag nano composite wave-absorbing material. The method comprises the following steps: preparing GO / Fe3O4 by using a simplified coprecipitation method, and preparing the RGO / Fe3O4 / Ag ternary composite material by employing a wet chemical reducing method. The preparation method is simple and rapid, large-scale production can be realized, the prepared composite material is good in wave-absorbing performance, and different wave bands can be effectively absorbed by adjusting the ratio of RGO to Fe3O4 to Ag, the amount of the reducing agent and the thickness of the composite material.

The invention relates to a construction of an electrochemical luminescence sensor for detecting acetyltransferase activity. The construction comprises the following steps: firstly, polishing, cleaning and activating a gold electrode, assembling captured DNA on the surface of the electrode through action of gold-sulfur bond, and enclosing non-specific binding sites on the surface of the electrode with MCH; then adsorbing a polypeptide chains through electrostatic action, performing acetylation treatment on the polypeptide chains under the action of HATp300, so as to separate from the surface of the electrode; secondly, performing hybrid chain reaction on the electrode in a hybrid chain solution containing two hairpin DNA, and reducing a silver cluster; and finally, detecting electrochemical luminescence signal of the assembled electrochemical luminescence sensor in the solution. The ECL biosensor has remarkable advantages on the quantitative analysis of HAT p300 and the activity analysis on HAT p300 in complicated cell lysis buffering solution.

The invention discloses a preparation method of an imitated cheese, comprising the following steps of: (1) shearing and premixing raw materials consisting of, by weight, 21-30% of chymosin casein,1-5% of other milky solid substances excluding the chymosin casein, 20-60% of a fat product, 1-3% of an emulsifying salt and 11-44% of water, wherein the emulsifying salt is phosphate and / or citrate; (2) stirring and emulsifying a slurry obtained by premixing; and (3) molding and cooling. The method provided by the invention is simple, fast and easy to operate. The imitated cheese prepared by the method can maintain the original local flavor and functional properties of the classic natural Mozzarella cheese. In addition, the applied raw materials and the product are easy to store, and the wire drawing performance of the product will not be changed with the storage time, thus effectively reducing cost and food safety risk.

The invention provides a carbon material-loading manganese dioxide nanowire array composite and a method for producing the same, and relates to a manganese dioxide nanocomposite and a method for producing the same. According to the invention, the material consists of a carbon material and manganese dioxide; and the method comprises the steps that the carbon material, potassium permanganate and sulfuric acid are taken as raw materials, and after simple technologies of mixing, stirring, oxidation-reduction reaction, solid-liquid separation, washing and drying, the product is obtained. The method is simple, is convenient to operate, is environment-friendly, consumes less energy, and is low in production cost and convenient to popularize and apply; and the product which is produced through the method has the characteristics of high conductivity, high specific surface area, high proton diffusion coefficient, quick charging and discharging capability, excellent electrochemical performance and the like. The method can be widely used for producing manganese dioxide nanocomposite, the product which is produced by adopting the method can be widely applied in lithium ion batteries, solar cells, supercapacitors and other new energy devices, and is particularly suitable for being used as electric and heat conduction materials, catalyst carriers, sensors and other materials.

The invention provides an extraction method for flavor components in tobacco. The extraction method comprises the following steps of carrying out equalization treatment or drying treatment on tobacco shred or tobacco leaves, and enabling the water content of a sample to be uniform; cooling after putting the tobacco shred or tobacco leaves in an extraction solvent for dipping; putting mixed liquor in an ultrasonic crusher, and crushing the tobacco shred or tobacco leaves by utilizing ultrasonic waves; sealing a container after crushing the tobacco shred or tobacco leaves, centrifugally removing a solid-phase matter after continuously dipping the tobacco shred or tobacco leaves, thus obtaining an extraction solution of the flavor components in the tobacco. The invention further provides the application of the extraction method for the flavor components in the tobacco in tobacco flavor component content analysis and tobacco extractive preparation. According to the extraction method of the flavor component in the tobacco, disclosed by the invention, in-advance crushing treatment does not need to be carried out on the tobacco shred or tobacco leaves through adopting an ultrasonic crushing and extracting technology, the loss of the flavor component is effectively reduced, the extraction efficiency is high, the extraction technology is simplified, the flavor component in the tobacco can be quantified, and the tobacco extractive can be effectively prepared.

The invention belongs to the field of a silicon-containing negative electrode material of a battery, and discloses a silicon-containing composite material and a preparation method and an application thereof. The silicon-containing composite material comprises silicon particles, phytic acid, graphene oxide and carbon nanotubes, wherein the surfaces of the silicon particles are coated with the phytic acid to form silicon-phytic acid particles; and the silicon-phytic acid particles, and the graphene oxide and carbon nanotubes are crosslinked to form a 3D network structure. The preparation method mainly adopts ball milling and freezing and drying processes. The silicon-containing composite material provided by the invention can be used for a lithium ion battery or a sodium ion battery, is high in charge-discharge capacity and cycling stability, has readable and writable, and printable features, and has quite high application prospect in the energy storage field; and in addition, the silicon-containing composite material provided by the invention has low production cost, rapid preparation method, and simplicity and feasibility.

The invention discloses a cobaltosic oxide / NiCoAl dual-layer hydroxide composite material and a preparation method thereof. According to the method, a cobaltosic oxide / NiCoAl dual-layer hydroxide compound with a core-shell structure is prepared by a twice hydrothermal method; according to the prepared cobaltosic oxide / NiCoAl dual-layer hydroxide compound with the core-shell structure, a cobaltosic oxide nanowire is taken as a core; NiCoAl dual-layer hydroxide is taken as a shell; and the cobaltosic oxide nanowire and the NiCoAl dual-layer hydroxide generate a synergistic effect to enhance the electrochemical property. Therefore, the technical problems of unstable structure, poor rate capability and the like in the prior art are solved; and the cobaltosic oxide / NiCoAl dual-layer hydroxide composite material is especially suitable for a super capacitor material; the preparation method is simple and fast; and large-scale production can be realized.

A thiaminogen composition in the form of injection or freeze-dried powder injection is prepared from the thiaminogen, surfactant, the water for injection and selective excipient.

The invention relates to a bioabsorbable bone repair material and its use and manufacturing method. The bioabsorbable bone repair material is prepared from a bioabsorbable polyester polymer and calcium phosphate. Through injection molding and material increasing manufacture (3D printing), the bioabsorbable bone repair material can be processed to form desired prosthesis bone, the surface of the prosthesis bone is coated with a bone induction promoting substance and the coated prosthesis bone is implanted into a limb. The prosthesis bone prepared from the bioabsorbable bone repair material can be used for fast and individular repair of bone injuries caused by various reasons, has good biocompatibility and has enough mechanical strength and bone induction functions.

The invention provides a novel skin anti-allergy and repair composition, and also provides skin repair cream containing the skin anti-allergy and repair composition, and a preparation method of the skin repair cream. An anti-allergy and anti-inflammatory traditional Chinese medicine composition extract aiming at sensitive or damaged skin multi-dermatitis is adopted, meanwhile, other component rawmaterials are supplemented, and after compounding, the skin repair cream has synergetic effects of clearing heat, detoxifying and cooling blood, and can be beneficial to diminishing inflammation, sterilizing, astringing, repairing, improving skin resistance, eliminating scytitis, astringing, moistening, lustring skins, repairing damaged parts, and recovering elasticity and luster of the skins. Theskin repair cream can be used for eliminating carbuncle swell, cleansing, lustring, nourishing and protecting the skins, and is suitable for skin types with skin allergy, pruritus, desquamation, inflammation and the like caused by misusing cosmetics.

The invention belongs to a preparation method of a biosensor, and relates to a preparation method of a graphene field-effect transistor biosensor. The preparation method comprises the following steps: (1) preparing a single-layer graphene copper plate; (2) preparing devices on a substrate layer of a sensor; (3) performing directional transfer on graphene; and (4) heating to bake the sensor, removing PMMA (polymethyl methacrylate) with acetone, performing vacuum annealing, and modifying the graphene with probes to obtain the graphene field-effect transistor biosensor. According to the preparation method provided by the invention, large-scale preparation of the biosensor based on CVD (chemical vapor deposition) graphene can be realized, the copper etching time is short, and the preparation method is simple and quick and can greatly lower the manufacturing cost; and in the preparation process, the PMMA polymer is used only once (in the traditional method, the PMMA polymer is used for more times, at least three times), thus greatly improving the surface cleanliness of the graphene, retaining the intrinsic high performance of the graphene and being more beneficial to subsequent probe modification.

The invention provides a multifunctional cigarette cracking capsule based on a liquid marble and a preparation method of the multifunctional cigarette cracking capsule, and belongs to the fields of colloid and interface science and micro-nano encapsulating. The multifunctional cigarette cracking capsule has a structure as shown below. The preparation method of the multifunctional cigarette cracking capsule comprises the following steps: I. dropwise adding liquid drops above a stabilizing agent which is hydrophobic powder, and preparing the liquid marble by virtue of a rolling dropping method; and II. immersing the liquid marble in a photo-curable coating which contains an initiating agent or spraying the photo-curable coating containing the initiating agent outside the liquid marble, and curing through ultraviolet radiation, so that a microcapsule is obtained. The multifunctional cigarette cracking capsule based on the liquid marble disclosed by the invention is simple and mild in preparation process, and is excellent in stability, water retention and moisture preserving properties, and disinfecting property; harmful ingredients in inhaled gas of a cigarette can be removed and cigarette taste can be enhanced; therefore, the multifunctional cigarette cracking capsule has broad application prospect.

The invention discloses a SERS sensor of a sandwich structure for detecting tyrosinase, and a preparation and detection method thereof. The SERS sensor utilizes the specific recognition principle of the tyrosinase antigen antibody, and a solid phase antibody-to-be-detected antigen-labelled antibody sandwich structure is formed through the combination of the solid-phase antibody on a substrate andthe labelled antibody with the antigen through the adsorption of the magnetic substrate and the enhancement effect of the surface-enhanced Raman probe, the content of the tyrosinase is analyzed by recognizing a labelled molecular SERS signal, and then a surface-enhanced Raman analysis method for detecting the tyrosinase is established. The detection method disclosed by the invention has the advantages of being quick, sensitive, simple and less in sample consumption. Furthermore, the sensor for detecting the tyrosinase has good linearity, the detection limit is low, and can reach 1ng / mL. And meanwhile, the adding standard recovery rate of the tyrosinase in the human serum sample is in the range of 96.0%-136.0%. Therefore, the SERS sensor is expected to be an effective method for clinicallydetecting tyrosinase.

The invention discloses a supported noble metal nanoparticle composite material and a preparation method thereof, and in particular, relates to a stable-chemical-property metal organic framework supported noble metal nanoparticle composite material and a preparation method thereof. Noble metal nanoparticles in the composite material have uniform particle size and narrow distribution range, and have the particle size in the range of 3 to 4 nm. An inorganic noble metal acid is used as a precursor, a metal organic framework which has stable chemical properties and cannot be corroded by an inorganic noble metal acid aqueous solution in the preparation process is selected as a carrier, a specific wet impregnation and in-situ reduction method is combined, and thus the composite material is obtained. The method has the advantages of simple and fast operation and mild conditions, an exposed crystal face of the noble metal nanoparticles in the obtained composite can be controlled to be a face-centered cubic fcc (111) crystal face, and the application prospects are wide.

The invention relates to a preparation method of bromfenac sodium. The preparation method comprises the following steps of (a) reacting a compound represented by a formula (V) with an electrophilic substitutional reagent in the presence of N,N-dimethylformamide or dimethyl sulfoxide to obtain a compound represented by a formula (IV), (b) adding the compound represented by the formula (IV) into 2-methoxyethanol, adding phosphoric acid and carrying out acid hydrolysis to obtain a compound represented by a formula (III), (c) hydrolyzing the compound represented by the formula (III) with sodium hydroxide, extracting with dichloromethane and adding acetic acid to neutralize to obtain a compound represented by a formula (II) and (d) in the presence of an organic alcohol solvent, adding a sodium hydroxide solution, hydrolyzing the compound represented by the formula (II) to form a salt, adding the organic alcohol solvent, cooling and crystallizing to obtain bromfenac sodium. According to the preparation method disclosed by the invention, the reaction yield of the intermediate (IV) and the quality of the product are improved, high-purity bromfenac sodium can be obtained just by virtue of crystallizing with the organic alcohol solvent, the good environmental benefit is achieved and the generation of bromfenac sodium polymer impurity is reduced.

The invention discloses a preparation method of a diamond segment. The preparation method comprises the following steps in sequence: a certain amount of prealloy powder or elemental metal powder, diamond and additives are weighed and mixed; the diamond segment is formed through pressing; the pressed diamond segment is sintered; and the sintered diamond segment is polished, wherein the sintering is high-temperature continuous sintering. The preparation method of the diamond segment is simple, wide in application range and low in processing cost, the sharpness of a product is good, the production efficiency is high, edge breakage is almost avoided, and automatic batch production can be realized. According to the diamond segment finishing high-temperature continuous sintering, the diamond can be firmly held by the prealloy powder or elemental metal powder matrix, so that the diamond segment has longer service life and higher sharpness, the relative density of the sintered diamond segment can be higher than 90%-98%, and the hardness can reach HRB 100-115.

The invention relates to the technical field of fireproof coatings; for solving the problems that a building exterior wall thermal insulation material and other flammable materials have poor fireproof safety and are easy to age and burn, the invention provides a preparation method and application of an organosilicone flame-retardant fireproof coating. The organosilicone flame-retardant fireproof coating is prepared from the following components in parts by weight: 40-70 parts of organosilicone resin, 20-40 parts of an auxiliary agent, 0-15 parts of a flame-retardant filler, and 4*10<-4>-50*10<-4> parts of a catalyst. The organosilicone resin as a substrate is used for preparing the solvent-free type low-viscosity organosilicone coating which can be rapidly cured at room temperature, flame-retardant fireproof effects on combustible materials can be realized, and besides, the coating has the better ability to resist deformation and better adhesive property.

The invention discloses a three-dimensional reconstruction method for a soil microstructure. The three-dimensional reconstruction method comprises the following steps: I, acquiring a soil sample: acquiring the soil sample on which three-dimensional reconstruction is required to be performed, wherein the soil sample is a cylindrical soil sample; II, hierarchically scanning the soil sample: hierarchically scanning the soil sample from top to bottom by using a scanning electron microscope, wherein the soil sample is divided into a plurality of scanning surfaces from top to bottom, the scanning electron microscope is adopted during scanning of each scanning surface, and each scanning surface is divided into a plurality of regions for scanning, then a plurality of electron microscope scanning images acquired by scanning are spliced to acquire an entire electron microscope scanning image of the scanning surface; III, sorting the electron microscope scanning images; IV, positioning the images; V, performing three-dimensional reconstruction: calling a three-dimensional reconstruction module to process a plurality of entire electron microscope scanning images to acquire a three-dimensional space model of the soil. The method has the advantages of simple steps, rational design, convenience in implementation and good use effect, and the established soil three-dimensional space model can truly reduce the internal structure of the soil.

The invention discloses a processed cheese stored in the room temperature and a method for preparing the same. The processed cheese stored in the room temperature comprises the materials of, 15% to 60% of natural cheeses, 2% to 14% of fat products, 3% to 40% of other milk solids other than the natural cheeses and the fat products, 4% to 10% of starch, 3% to 7% of vegetable protein, 0.1% to 0.5% of antioxidants, 1.5% to 2.5% of emulsifying salt and 13% to 25% of water, wherein the percentages are the mass percentages that each material accounts for the total material amount; and the emulsifying salt is phosphate. According to the processed cheese stored in the room temperature and the method for preparing the same, the processed cheese can be stored in the room temperature and has at least a 4-month shelf life, and the situation that current state market cheeses can be only refrigerated is broken, so that the cheese market promotion is facilitated; the processed cheese has mild flavor and can maintain original characteristic flavors and functional characteristics of classical cheeses; the texture is hard, and the processed cheese can be packed into flexible and various snack forms.

The invention belongs to the field of a nano material and particularly relates to a method for preparing gold nanoparticles. The method selects 2,6-dipicolinic acid (PDCA) as a reducing agent to reduce chloroauric acid to generate the gold nanoparticles by reaction; and then the 2,6-dipicolinic acid is used as a protecting agent on the surfaces of the gold nanoparticles; and the reaction condition is moderate and the gold nanoparticles are spherical nanoparticles which are mono-dispersed and uniform. The obtained gold nanoparticles are characterized by an ultraviolet-visible light spectrum (UV-vis), a transmission electron microscope (TEM) and x-ray energy spectrum analysis. The result shows that the particles are spherical, are uniform in size, the diameters of the particles are 6-8nm and the dispersion degree of the gold nanoparticles is high. The method for preparing the gold nanoparticles has the advantages of convenience for operation, moderate condition, and high yield, adopts environment-friendly materials, and also can be used for controllably preparing the mono-dispersed gold nanoparticles.

The invention discloses a palladium-cobalt / graphene nano electro-catalyst and a preparation method thereof. According to the palladium-cobalt / graphene nano electro-catalyst, palladium serves as an active ingredient, cobalt serves as a cocatalyst, and graphene serves as a carrier; and in the catalyst, the mass fraction of the palladium is 10-40%, the mass fraction of the cobalt is 5-30%, and the balance is the carrier. According to the preparation method of the catalyst, graphite oxide nanosheets are ultrasonically dispersed into polylol, palladium salt liquid, cobalt salt liquid and sodium acetate liquid are then added and fully mixed uniformly, the mixture is then transferred into a microwave hydrothermal reaction kettle, and the filtering, washing and drying processes are carried out after reaction, thereby obtaining the palladium-cobalt / graphene nano electro-catalyst. The preparation method disclosed by the invention has the advantages of energy saving, high speed, simple process and the like; and the particle sizes of palladium and cobalt nanoparticles in the prepared palladium-cobalt / graphene nano electro-catalyst are uniform. The catalyst has high electro-catalytic activity to the electrooxidation of formic acid and is widely applied to fuel cells.