381results about How to "Promote commercial application" patented technology

The present invention relates to a nitrogen-doped porous carbon material for a lithium-air battery positive electrode, wherein the nitrogen-doped porous carbon material has an interconnected graded pore structure, N is uniformly doped in the C skeleton, N accounts for 0.2-15% of the carbon material atomic ratio, the graded pores comprise mass transfer pores and deposition holes, the deposition holes account for 40-95% of the total pore volume, and the mass transfer pores account for 4-55% of the total pore volume. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the energy density and the power density of the lithium-air battery can be effectively increased; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the nitrogen doping manner is easily achieved.

The invention relates to the chemical technology field, and concretely relates to a formaldehyde scavenging agent with oil solubility and a preparation method and a usage method. The formaldehyde scavenging agent with oil solubility can be prepared to paint, and can be used for coating on the furniture, floor or other decoration sheet materials, and has good purification efficiency on indoor free formaldehyde, and no secondary pollution can be generated. On the premise of no change of the sheet material application and construction technology in the prior art, and the release of indoor formaldehyde can be fundamentally controlled. The preparation method is simple, the usage is convenient, and the formaldehyde scavenging agent is suitable for large-scale production and business application for enterprises, has good application prospect, and has obvious economy and social benefit.

The invention discloses a composite carbon-based electrode material used for super capacitors and its preparing method, and it is composed of nano metals, nano metal composite oxide, activated carbon and nano carbon fiber, effectively using the activated carbon with high specific surface area and the nano carbon fiber to provide a double electric layer capacitor for a super capacitor, combining a Faraday quasi-capacitor provided by the nano metal oxide, and at the same time using the high electric conductivity of the nano carbon fiber and nano metals and the nano cooperation effect, thus increasing its capacitor and power densities and able to obtain the super capacitors with high energy and power densities, and the invention is low-cost and easy for commercial application.

The invention relates to a preparation method of a nitrogen-doped hollow carbon ball loaded palladium-based catalyst, which comprises the following steps of: dispersing o-phenylenediamine in a solvent for being stirred at a low temperature, adding an initiator for reacting for 12-24h, then extracting and filtering, and drying in vacuum to obtain a poly(o-phenylenediamine) hollow ball; pyrolyzing an o-phenylenediamine polymer at a high temperature for 2-6h under the protection of an inert gas to obtain a nitrogen-doped hollow carbon ball; and dispersing the nitrogen-doped hollow carbon ball into water, adding a chloropalladic acid solution for ultrasonic treatment, adding a reducing agent for ultrasonic treatment, extracting and filtering after the reaction is completed, and drying in vacuum to obtain the nitrogen-doped hollow carbon ball loaded palladium-based catalyst. The nitrogen-doped hollow carbon ball loaded palladium-based catalyst prepared by adopting the preparation method has the nitrogen content of 10.4-22.4wt%, has the advantages of excellent oxidization reaction catalysis property to alcohol, stable performance, low preparation cost and simple preparation process, and is a novel high-performance catalyst for a low-temperature direct alcohol fuel cell anode.

The invention discloses a lithium anode for a high-specific-energy secondary battery. The lithium anode for the high-specific-energy secondary battery consists of a conductive substrate, a nanotube array, lithium metal and a barrier layer, wherein the nanotube array grows on the conductive substrate in an oriented manner; the lithium metal exists in the nanotube array; the barrier layer covers the nanotube structure. The lithium anode for the high-specific-energy secondary battery has the advantages that the lithium metal exists in a pipeline structure in a sealed manner, lithium dendrites can be prevented effectively, and a metal organic frame (MOF) which is rich in electrolyte or another lithium conducting material is used as the barrier layer, so that overgrowth of the lithium dendrites in local nanotubes can be prevented effectively, and the safety of the battery is ensured.

The invention discloses a method for processing multi-dimensional data based on a virtual data cube. The method includes a definition phase of the virtual data cube and a service phase of the virtual data cube. The definition phase of the virtual data cube includes a, creating a virtual data cube structure; b, loading a database structure and displaying the database structure in a graphical manner; c, defining structure relation of data; and d, storing a data structure. The service phase of the virtual data cube includes steps of I, loading information; II, setting dimensions and measure; III, requesting for inquiring data and returning a result set; and IV, displaying in a row and column combined multi-dimensional mode. Simultaneously, the invention further discloses a multi-dimensional data processing system based on the virtual data cube. By the aid of the method, the multi-dimensional data cube structure is directly represented in a relation type database in a virtual manner, so that the data are displayed visually, freely and timely.

The invention discloses a method for preparing a three-dimensional flower-shaped graphene / molybdenum disulfide composite loaded fibrous counter electrode. The method for preparing the three-dimensional flower-shaped graphene / molybdenum disulfide composite loaded fibrous counter electrode uses a one-step hydrothermal reduction method, to be specific, adding molybdic acid or the water solution of molybdenum oxide, ammonium thiocyanate and graphene oxide in a hydrothermal reactor, vertically immersing carbon fiber in the reaction liquid, carrying out hydrothermal reduction reaction for 12 to 36 hours under 160 to 200 degrees centigrade, taking out the carbon fiber after ending reacting, using deionized water and absolute ethyl alcohol to wash, and drying. The method for preparing the three-dimensional flower-shaped graphene / molybdenum disulfide composite loaded fibrous counter electrode has advantages of simple technique, moderate reaction condition, high yield, good reproducibility, easiness in scale production and the like; the photoelectric conversion rate of a dye-sensitized solar cell composed of the prepared fibrous counter electrode is obviously higher than that of a dye-sensitized solar cell composed of an MoS2 or platinum loaded fibrous counter electrode, and the method for preparing the three-dimensional flower-shaped graphene / molybdenum disulfide composite loaded fibrous counter electrode is important for promoting the commercial application of the dye-sensitized solar cell.

An electrode process method for multiple Na / Br sulfide type energy storage battery is to mix carbon loading transition metal catalyst and perfluorinated sulfonic acid resin uniformly to be coated on the supporting carbon paper or felts as the negative pole, and mix carbon loading Pt catalyst and perfluorinated sulfonic acid resin evenly to be coated on carbon paper or felts as the positive pole. The inverted electrodes have rather high mechanical strength, good conductance.

The invention discloses a branch controllable titanium dioxide nanotube array thin film and a preparation method thereof. The thin film consists of an array of a titanium dioxide nanotube formed by connecting a main tube and a branch tube in series; the thickness of the thin film is 1-100mum, and the porosity factor is 40-60 percent. The preparation method comprises the following steps: preparinga main tube electrolyte according to the proportion that the mole ratio of ammonium fluoride to glycol to water is 0.05-0.15:17.7:0.015-0.025, and preparing a branch tube electrolyte according to theproportion that the mole ratio of hydrofluoric acid to glycol is 0.15-0.25:17.7; then firstly, putting one surface of a titanium sheet in the main tube electrolyte to serve as the anode; carrying outanode oxidization under the conditions that the DC voltage is 55-65V and the temperature is 0-35 DEG C for 0.5-6h; then using the glycol to clean the anode; subsequently, putting the surface which isanodized in the branch tube electrolyte to serve as the anode, and carrying out anode oxidization under the conditions that the DC voltage is 30-120V and the temperature is 0-35 DEG C for more than 30min, thereby preparing the thin film. The thin film can be widely used for fields of dye-sensitized solar cells, gas sensors, photolytic water hydrogen production and photonic crystal.

The invention provides a text abstract and sentiment classification combined training method, which is realized by adopting a text abstract and sentiment classification combined model, and specifically comprises the following steps of: preprocessing a text, and constructing a training set vocabulary; constructing a text abstract model, and carrying out text abstract task pre-training; adding an emotion classification layer on the basis of a text abstract model, constructing a layered end-to-end model, and jointly training emotion classification and text abstract tasks. The invention provides atext abstract and sentiment classification combined training method. Through combined training of the two types of tasks, the content consistency between the generated abstract and the input text canbe improved, the generated abstract can better contain emotion information of the input text, key information of the input text is extracted through the abstract task, and emotion prediction is moreaccurate.

A preparation method of graphene coated silica nanotube composite negative electrode material for lithium ion batteries is as follows: (1) dispersing zinc oxide nanorods to an ethanol solution, sequentially adding water, ammonia water and a TEOS solution to obtain zinc oxide / silica core-shell nanorods; (2) dispersing the products from the step (1) in to an aqueous solution of sodium chloride, and adding PDDA for modification; (3) dispersing the products from the step (2) and the graphene oxide into an aqueous solution, dropwise adding sodium borohydride to obtain graphene coated zinc oxide / silica core-shell nanorods; and (4) dispersing the products obtained from the step (3) in an excessive amount of acid solution to dissolve zinc oxide nanorods, so as to obtain the composite negative electrode material. According to the invention, zinc oxide nanorods are used as templates, and coated by silicon dioxide and graphene, and then the template is removed, so as to prepare the graphene coated silica nanotube composite material. The prepared composite material has the performances of high discharge capacity, long cycle life and high rate capability.

This invention relates to a method for preparing high Q-value magnesium titanate base microwave medium ceramics by adopting a reactive sintering method. The steps are as follows: (1) mixing according to the ingredients of the magnesium titanate base microwave medium ceramics and the mass percent of the ingredients: MgTiO3- mwt%MO, wherein MO is an additive CoO, NiO, ZnO, MnO2, ZrO2 or SnO2, and mis larger than or equal to 0 and smaller than or equal to 10; (2) drying and screening ball-milled materials; (3) granulating and screening, pressing to form a green body, and sintering at the temperature of 1250-1400 DEG C; and (4) conducting physical and dielectric property detection. This invention omits pre-burning and secondary ball-milling of powder materials, saves time and energy costs, and provides the reactive sintering method of magnesium titanate base microwave medium ceramic materials, wherein the reactive sintering method is simple in preparation technology, has an extremely high quality factor and improves the resonant frequency temperature coefficient of the magnesium titanate base microwave medium ceramic materials; and with the method, the application of the materials in microwave communication is wider.

The invention belongs to a microdeformable mirror and the machining and preparing field thereof, concretely relating to a piezoelectric film drive-based microdeformable mirror and the preparing method thereof. And the mcirodeformable mirror comprises micro actuator array composed of actuating units and mirror surface, where the micro actuator array is of a centrosymmetric regular hexagonal structure and the mirror composed of monocrystalline silicon diaphragm is connected with upper electrodes through photosensitive high polymer boss; the preparing course comprises: preparing silicon substrate piezoelectric ceramic base film, using wet-etching process to etch the silicon substrate piezoelectric ceramic base film, using wet-etching process to etch silicon substrate piezoelectric ceramic thick film shape, preparing upper electrode array on the silicon substrate piezoelectric ceramic thick film array, and preparing connection boss on the upper surface of the upper electrode array and using photosensitive high polymer to fix the mirror surface on the actuator array. And the microdeformable mirror can drive the mirror to generate larger displacement so as to meet the requirements of the fields of astro-observation, amotio imaging, etc; and the preparing method has simple process, low cost and good commercial application prospect.

The invention discloses a floating-type wind energy and wave energy combined power generating system which comprises a wind power generating system and a plurality of oscillating water column type wave energy power generating devices of the same structure. As for the wind power generating system, the upper end of a tower tube is connected with a wind power generating unit, a plurality of buoys ofthe same structure are mounted at the lower end of the tower tube through a truss structure to serve as the oscillating water column type wave energy power generating devices, and each buoy is provided with a wave inlet, an air chamber and an air outlet sequentially from bottom to top; an air turbine power generator is mounted at each air outlet; and waves enter the buoys through the wave inlets to drive the air turbine power generators to generate power. The floating-type wind energy and wave energy combined power generating system is simple in structure, convenient to mount and construct, low in cost and wide in applicable water depth range; wind power generating and wave energy power generating are completed on the same supporting structure and shares a supporting platform and a power transmission mating system, and thus the power generating cost is lowered; and the wave energy power generating device adjusts platform damping, thus the motion stability of the system is improved advantageously, and the floating-type wind energy and wave energy combined power generating system is a reliable offshore renewable energy source power generating platform.

The invention provides a lithium ion battery anode material coated with piezoelectric material on the surface and a preparation method thereof. The surface of the battery anode material is coated witha layer of piezoelectric material with piezoelectric effect; the piezoelectric material comprises any one or more of barium titanate, lithium niobate, sodium niobate, lithium tantalite, sodium-potassium metaniobate and barium-strontium metaniobate with piezoelectric effect. The piezoelectric characteristic of the piezoelectric material is utilized to realize a coating modification function for the anode active materials so as to ensure that the volume phase structures of the anode active materials are not influenced and damaged, the growth of solid-electrolyte interface membranes is suppressed, and the diffusion speeds of active material-coating layer interface lithium ions are improved, thereby effectively improving the structure stability and electrochemical cycle performance of the lithium ion battery anode material, improving the pyrolysis temperature of the anode material and then enhancing the safety performance of the lithium ion batteries in the using process.

A method to prepare membrane electrode by remaking quantum exchange membrane of perfluorosulphonic acid includes the following steps: 1) to placing the substance of perfluorsulphonic acid into water containing organic polarity solvent with low boiling point and dissolving it by heating in a sealed reactor, 2) drying the solution of perfluorosulphonic acid by heating, 3) adding high-boiling point organic solvent for dissolving the dried substance of perfluorosulphonic acid and placing it in the dryer for 24 hour for obtaining the membrane making liquid, 4) pouring the membrane making liquid into a mould after the mould being warmed and producing the membrance by vacuum heat drying, 5) spraying the membrane making liquid on the catalytic layer surface of multihole gaseous diffusion electrode and drying it by heating after it being airdried.

The invention relates to a novel stationary type wind energy and wave energy integrated power generation system, belonging to the technical field of marine renewable energy utilization. A single pile of a fan is fixedly connected with a sleeve near the sea level, and an oscillating wave energy power generation deice is connected with the sleeve positioned near the sea level through a fastening device. Two fastening devices are arranged on the sleeve. The wave energy power generation deice comprises a PTO energy catching system and floaters, and the floaters are symmetrically arranged on the two sides of a single pile foundation and reaches the first fastening device through hinges. The PTO energy catching system is hinged between the floaters and the second fastening device and is vertical to the floaters. The PTO energy catching system converts linear piston motion to electricity through a linear generator and is connected with the power transmission system of a wind driven generator. The power generation system improves the effective utilization ratio of sea area, reduces the construction cost and maintenance cost, makes full use of the existing mature fan technology, promotes the commercial application of a wave energy device, and is a reliable marine renewable energy power generation platform.

The invention provides a method of crossbreed seed producing which performs rhizocarpous regeneration by use of the cotton sterile male line and restorer line, and the steps are that: a. first year, in the region where the cotton is able to live through the winter, the cotton male sterile line and the restorer line are respectively planted, the restorer line is used as the male parent to crossbreed with the sterile line to produce the F1 crossbreed cotton seeds so as to being used for the large-area production; b. after gaining the seeds, the sterile line and the restorer line plant live through the winter in natural environment; c. next year, the sterile line and the restorer line plant through the winter are pruned and trained, subsequently, the restorer line is used as the male parent to crossbreed with the sterile line during the flowering period, again the F1 crossbreed cotton seeds are produced so as to being used for the large-area production; d. the two steps of b and c are repeated for 1 to 3 times. The invention promises one year planting and continuously gaining the crossbreed seeds for many years, the invention provides labor and time saving for crossbreed seed production with low cost; moreover, the advantages of the crossbreed can be kept for a long time and the planting output and the quality of the crossbreed cotton can be assured, which is convenient for the commercialized application and has extremely important significance in the popularization of the utilization technology of the cotton crossbreed advantages.

The invention discloses a preparation method of a lamellar stannic sulfide / silicon oxide nuclear shell nanorod for a lithium battery. The preparation method comprises the following steps of: adding a tin nanorod to ethanol solution and carrying out ultrasonic dispersion; and then sequentially adding a certain amount of water, ammonia water and tetraethoxysilane solution, reacting for 30-720 minutes, carrying out centrifugal separation and drying to obtain a tin / silicon oxide nuclear shell nanorod; carrying out vulcanization reaction on the tin / silicon oxide nuclear shell nanorod in a tube furnace for 30-720 minutes at 400-600 DEG C to finally obtain the lamellar stannic sulfide / silicon oxide nuclear shell nanorod. The preparation method provided by the invention can be used for mass production and is convenient for commercial application to the negative electrode material of a lithium ion battery. After the lamellar stannic sulfide / silicon oxide nuclear shell nanorod which is synthesized by the method disclosed by the invention is applied to the negative electrode material of the lithium ion battery, the cycle performance is remarkably improved.

The invention relates to high-strength two-phase ultralight magnesium lithium alloy and a preparation method thereof and belongs to the technical field of light metal material preparation. The high-strength two-phase ultralight magnesium lithium alloy disclosed by the invention comprises the following components in mass percent: 6.0-9.0 percent of Li, 1.0-6.0 percent of Al, 0.01-1.0 percent of Y and 0.21-0.5 percent of Ca. According to the preparation method disclosed by the invention, magnesium lithium alloy is smelted in a general resistance furnace by adopting a flux-covering and gas protection method, so that the high-strength two-phase ultralight magnesium lithium alloy with the room temperature tensile strength of 162-190Mpa, the yield strength of 150-170Mpa, the percentage elongation of 15-30 percent and the density of 1.43-1.48g / cm<3> is obtained. The preparation process is simple; the obtained products are excellent in performance and industrial production is facilitated.

The invention provides an ion conductor and heterostructure co-modified lithium ion battery positive electrode material and a preparation method and application thereof. The modified lithium ion battery positive electrode material is coated by an ion conductor and is co-acted with a heterostructure; the modified lithium ion battery positive electrode material comprises an ion conductor coating layer, a heterostructure layer and a material body, the ion conductor coating layer is formed by reaction of a polyanionic compound, doped element salt and residual lithium on the surface of the material, and the phase of the heterostructure layer is a spinel phase or / and a rock salt phase and is located between the coating layer and the material body. The preparation method comprises the following steps of uniformly mixing lithium ion battery positive electrode material powder with polyanionic salt, doped element salt, weak acid and other compounds in a solution, drying by distillation, and sintering to obtain the product. The product obtained by the invention is used in energy storage equipment.

The invention relates to a nitrogen-doped porous carbon material used for anode of a lithium-air cell, which has a mutually communicated graded pore structure, N is uniformly doped in a C frame, wherein N accounts for 0.2-15% of carbon material, the graded pore comprises a mass transfer pore and a deposition pore, the pore volume of the deposition pore accounts for 40-95% of total pore volume, and the pore volume of the mass transfer pore accounts for 4-55% of total pore volume. The carbon material as the lithium-air cell material can greatly increase the space utilization rate of the carbon material during a charge and discharge process at maximum limit, so that lithium-air cell energy density and power density can be effectively increased. The nitrogen-doped porous carbon material used for anode of lithium-air cell has the advantages that the preparation technology is simple, the material source is wide, the pore structure of the graded aperture carbon material enables regulation and control, and the regulation and control modes are various, and the nitrogen doping mode is easy to realize.

The present invention relates to a nitrogen-doped porous carbon material for a lithium-air battery positive electrode. The nitrogen-doped porous carbon material is characterized in that the nitrogen-doped porous carbon material has an interconnected graded pore structure, N is uniformly doped in the C skeleton, N accounts for 0.2-15% of the carbon material atomic ratio, the graded pores comprise mass transfer pores and deposition holes, the deposition holes account for 40-95% of the total pore volume, and the mass transfer pores account for 4-55% of the total pore volume. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the energy density and the power density of the lithium-air battery can be effectively increased; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the nitrogen doping manner is easily achieved.

The invention discloses a longsnout catfish fillet coating antistaling agent, a preparation method and a resh-keeping method thereof. Specifically, the longsnout catfish fillet coating antistaling agent comprises the following components in terms of the concentration in an aqueous solution, 10-25g / L chitosan, 1-3g / L a rosemary extract, 2.5-5g / L glycerol, 10ml / L acetic acid, 2.5-5g / L Tween-80, and water as the solvent. According to the invention, the rosemary extract is added into the chitosan solution to prepare the composite coating antistaling agent, and the bacteriostatic and antioxidant capacity of the coating antistaling agent can be greatly improved. After coating of longsnout catfish fillets, microbial growth can be inhibited, the grease oxidation rate can be slowed down, the juice loss is reduced, and longsnout catfish fillets can maintain good quality. By storing the longsnout catfish fillets using the composite coating antistaling agent under an environment of 0-5DEG C, the shelf life can reach 10-14d. The longsnout catfish fillet coating antistaling agent provided by the invention is simple to use, easy to operate and low in cost, and is conducive to commercial application.

The invention provides a negative electrode active material for a lithium-ion / sodium-ion secondary battery, a negative electrode and a battery, belonging to the technical field of electrochemistry and batteries. The negative electrode active material comprises a phosphorus-germanium compound, or / and a first complex formed by the phosphorus-germanium compound and elementary P or / and elementary Ge, or / and a second complex formed by the phosphorus-germanium compound and conductive components, or / and a third complex formed by the first complex and conductive components. The negative electrode provided by the invention comprises the negative electrode active material. The negative electrode has the advantages of high specific capacity, high initial Coulomb efficiency, small charge-discharge voltage platform difference and good high-current charge-discharge performance.

The invention belongs to the technical field of lithium ion battery materials, and discloses a synthesis method of a precursor of a ternary positive electrode material. The precursor synthesis process comprises three stages, the first stage is a rapid nucleation stage, the second stage is a middle constant-speed growth stage, and the third stage is a slow growth stage. The morphology and performance of the precursor are controlled by adjusting the pH values of different stages, the flow of the mixed salt solution, the flow of the oxidizing gas and the rotating speed. The particle size of the precursor in the growth stage can be controlled by adjusting the pH value and the flow of the mixed salt solution; primary particles can be refined by adjusting the flow and the rotating speed of the oxidizing gas, the agglomeration phenomenon of the primary particles is improved, the sphericity degree of the precursor can be improved by adjusting the low ammonia concentration, and the precursor which is loose, porous and high in sphericity degree is obtained. In addition, the prepared precursor is large in specific surface area and high in tap density.

The invention provides an RGD polypeptide coordination complex of a radioactive nuclide label. According to the structure of the coordination complex, the radioactive nuclide is selected from 64Cu, 68Ga, 111In, 62Cu, 67Cu, 67Ga, 86Y, 89Zr or 18F; the ligand is a ligand compound containing an RGD structure, which is shown in a formula (I). The coordination complex has stronger ligand stability and high target / non-target ratio, and the appetency of the ligand with integrin AlphavBeta3 is stronger. The invention further provides a preparation method of the coordination complex, and an application of the coordination complex in preparing tumor developers.

The invention discloses nano ferric hydroxide and a preparation method thereof. The shape of nano ferric hydroxide is a nano-sheet cluster, wherein the cluster diameter of the nano-sheet cluster is between 400 and 500nm, and the sheet length of nano-sheets forming the nano-sheet cluster is between 200 and 250nm, and the sheet width is between 20 and 25nm, and the sheet thickness is between 2 and 5nm; the nano-sheet cluster is formed by orthorhombic system alpha-ferric hydroxide, and the specific surface area of the nitrogen adsorption and desorption representation is between 100 and 105m<2> / g. The method comprises the following steps of: mixing ethylene glycol and deionized water, and performing ultrasonic to prepare ethylene glycol aqueous solution; respectively adding ferrous sulfate into the ethylene glycol aqueous solution, and performing ultrasonic to obtain ferrous sulfate mixed solution; adding urea into ethylene glycol aqueous solution, and performing ultrasonic to obtain urea mixed solution; injecting the urea mixed solution into the stirring ferrous sulfate mixed solution at a speed of 0.8-1.2ml / min according to a volume ratio of (0.8-1.2):3 to prepare a reaction solution; and injecting air into the reaction solution at a speed of 2.5- 3.5ml / min to prepare the target product. The nano ferric hydroxide can be widely applied to adsorption and photocatalytic decomposition of organic matters.

The invention belongs to the technical field of nanometer material synthesis, and particularly relates to a nanometer silver particle and a synthetic method thereof. The nanometer silver particle is in a spherical shape or a similar spherical shape, the surface of the nanometer silver particle is provided with a biomolecule wrapping layer, and biomolecules contain carboxyl groups with negative charge oxygen atoms. The nanometer silver particle is of a cubic crystal structure, and the particle diameter of the nanometer silver particle is 50 to 150nm. The nanometer silver particle is prepared by a biological material reduction method, orange juice and Ag<+> solution are uniformly mixed, the stirring is carried out at 26 to 34 DEG C, the centrifugal separation is carried out after the reaction completion, precipitates are washed and dried, and the nanometer silver particle is obtained. The biomolecules in the orange juice are used as templates, AgNO3 solution is utilized for providing silver ions, and the nanometer silver particle with the spherical appearance is synthesized through regulation and control. In fruit and vegetable juice such as orange juice, oxygen atoms on the groups such as carboxyl contained in biomolecules such as amino acid and vitamin mostly carry residual negative charges, the residual negative charges generate mutual effects with Ag<+>, nucleation sites are provided, and the generation of the nanometer silver particle is induced, regulated and controlled.

The invention relates to a protective metal anode structure and a preparation method thereof. The protective metal anode structure comprises a metal anode and a composite protective film formed on the metal anode and contacted with the metal anode directly, wherein the metal anode comprises a metal selected from the following groups of an alkali metal and an alkaline earth metal; and the composite protective film comprises inorganic compound particles dispersed in an organic compound matrix. The invention also provides the method for preparing the protective metal anode structure.