107results about How to "Increase the transmission channel" patented technology

The invention relates to a micro-nano-structure anode material for a Li-air battery and a preparation method of the micro-nano-structure anode material. The preparation method comprises the following steps of: preparation of hollow composite precursor fibers through electrostatic spinning by blending a metal nitride catalyst precursor with a high-carbon polymer in an organic solvent, preprocessing of the precursor fiber material, nitridation of complex fibers, and pore-forming and pore-expansion through activation. The preparation method is simple in technique and convenient to operate and is easy to realize the uniform distribution of nanoscale catalyst particles in hollow carbon fibers. A prepared anode material tube is hollow internally, a plurality of holes are formed on the wall of the tube, and metal nitride catalysts are uniformly distributed in the three-dimensional holes of the wall of the tube, so that high specific surface area provides a sufficient place for the reaction of the battery, and the hollow pore passage in the tube can ensure an oxygen diffusion channel to be smooth and has good ion transport capacity and electrical conductivity. According to the invention, the charge-discharge capacity of the Li-air battery can be improved effectively, the power multiplying performance and the power density of the Li-air battery can be improved, the internal resistance of the battery can be reduced, and the charge-discharge polarization can be lessened through the uniform distribution of the nanoscale metal nitride, therefore, the micro-nano-structure anode material has good industrialization prospect.

The invention discloses a high ionic conductivity sulfide solid electrolyte material, and a preparation method and application of the high ionic conductivity sulfide solid electrolyte material in a full-solid lithium-sulfur battery. A chemical composition of the material is Li7P3-xMnxS11-(3x+y) / 2Iy, wherein x is greater than 0 and less than 0.5, and y is greater than 0 and less than 1. The preparation method of the material comprises the following steps: mixing and ball-milling Li2S, P2S5, MnS and LiI to obtain an initial solid electrolyte material; and performing heat treatment for the initial solid electrolyte material under the inert gas, and then grinding into powder to obtain the high ionic conductivity sulfide solid electrolyte material. The lithium-sulfur solid battery is prepared by preparing a composite positive electrode formed by ball milling and uniformly mixing sulfur, conductive carbon black and solid electrolyte, and the positive electrode is used for solving the disadvantages of low electron conductivity rate of the sulfur and low ion conductivity. The prepared lithium-sulfur battery has the advantages of high safety, high energy density and high cycling stability.

The invention relates to a thermal preparation method of a solution of a self-supported porous graphene-based membrane, relates to a preparation method of a self-supported porous graphene-based membrane, and aims to solve the technical problems that the size and the thickness of a conventional self-supported porous graphene-based membrane are limited and the electrochemical performance of the conventional self-supported porous graphene-based membrane is poor caused by severe interlay lamination of graphene sheets in the chemical reduction process. The thermal preparation method comprises the following steps: dispersing graphene oxide into water, adding or not adding a doped carbon material, concentrating, and spreading into a membrane, thereby obtaining a graphene oxide membrane; preparing a thermal treatment solution by using acid or alkali solute, putting the graphene oxide membrane into a reaction kettle with a polytetrafluoroethylene lining, adding the thermal treatment solution according to the standard that the membrane is submerged, sealing the reaction kettle, and subsequently performing thermal treatment, thereby obtaining the self-supported porous graphene-based membrane. The self-supported porous graphene-based membrane is prepared by orderly arranging graphene sheets in parallel, and due to the gaps among the graphene sheet layers, the self-supported porous graphene-based membrane can be used in electrochemical energy storage devices such as supercapacitors.

The invention relates to a lithium-sulfur battery composite positive electrode material and a preparation method thereof. The positive electrode material consists of following components by weight percent: 30-59.4% of a conductive agent with a mesoporous structure, 40-60% of sulfur and 0.1-10% of a modifying agent, wherein sulfur is dispersed into holes of the conductive agent, and the modifying agent is connected with the holes of the conductive agent through a chemical bonding manner. The preparation method comprises the steps of pouring sulfur into the conductive agent by adopting a molten suction method so as to obtain a conductive agent / sulfur composite material; and then modifying the obtained conductive agent / sulfur composite material to obtain the lithium-sulfur composite positive electrode material. According to the composite positive electrode material, not only can the good high-rate stability be realized, but also the loss of active substances and the influences of corrosion to a lithium negative electrode, rapid capacity fading and the like caused by the 'shuttle effect' due to dissolution of lithium sulfide can be effectively reduced, and the cycle performance of the lithium-sulfur battery can be obviously improved.

This invention relates to a method and a system for playing network stream media data including: A, a customer end gets information of channels, B, selecting channels to get related action node list of the channels, C, getting new fellow node information to realize distribution of stream media data between the customer end and the fellow nodes by a channel server. Said system includes a media source and a customer characterizing that the channel server stores updated channel information files in the channel issued Web server, which receives the channel sent by the channel server and stores its information files, the customer end gets new fellow node information based on the action node list to realize distribution and play of stream media data.

The invention is applicable to the data processing field and provides a road underground cavity detection system and a vehicle-mounted system. The road underground cavity detection system comprises a central control system, a satellite positioning system, a digital pre-processing system, a power supply system and a ground penetrating radar system, wherein the satellite positioning system, the digital pre-processing system, the power supply system and the ground penetrating radar system are connected to the central control system, and the digital pre-processing system is connected to the ground penetrating radar system. The invention can detect the cavities under the road, restores the cavities underground in advance and thus prevents the collapse accidents.

The invention discloses a manganese oxide electrode material with a metal cation intercalation structure. In the material, metal cations are inserted between the layers of the original manganese oxide, and a metal nano sheet is also grown on the surface. The insertion of the cations increases the layer spacing so as to facilitate insertion and removal of the ions in the electrolyte during the charging and discharging process. The increase of the specific surface area provides larger contact sites for the ions in the electrolyte. The preparation method of the electrode material is as follows: 1), placing 0.1-10mol / L metal salt solution in a three-electrode electrolytic cell, taking the Ag / AgCl electrode as a reference electrode and the platinum sheet as a counter electrode and putting the manganese oxide into the three-electrode electrolytic cell to form a three-electrode system; 2), using the scanning rate of 5-500mV / s to electrochemically embed the metal cations into the manganese oxide material, wherein the number of segments can be 200-2000 segments; and 3) repeatedly cleaning the black-brown product and vacuum drying.

The invention relates to a preparation method for graphene-based three-element composite transparent conductive thin-film. The three-element composite film comprises graphene, silver nanowires and poly(3,4-ethylenedioxy thiophene): polystyrene sulfonate. Graphene has advantages of excellent optical and electrical properties and low cost. The size of a graphene sheet obtained on the basis of reduction of oxidized graphene, chemically reduced graphene, stripped graphene and other precursors is too small, and the graphene sheet has multiple structural defects so that resistance of the graphene thin-film is much higher than that of a commercial indium tin oxide thin-film. According to the method, a mode that the silver nanowires, poly(3,4-ethylenedioxy thiophene): polystyrene sulfonate and graphene are composite is adopted so that photoelectric performance of the graphene-based transparent conductive thin-film is enhanced. The treatment process based on liquid phase dispersion can be applied to large-scale production, and the material also has flexibility so that the material can be used as substitute material of indium tin oxide to be applied to a flexible transparent device.

The invention relates to an optimized preparation method of a membrane electrode containing an anion exchange resin transition layer used for electrolysis. The membrane electrode subassembly includes a specific combination of an anion exchange resin transition layer, a catalyst layer, a cathode gas diffusion layer, an anode gas diffusion layer and an anion exchange membrane. The membrane electrode subassembly prepared by the invention has a good performance when the membrane electrode subassembly uses as alkaline solid polymer electrolyte (AEM) water electrolysis. The membrane electrode has a wide utilization value in regenerative fuel cell (RFC), photoelectrocatalysis and electrolytic hydrogen generator.

Each component constituting electrode catalysis layer is in gradient distribution in Z direction of electrode (perpendicular to direction of catalysis layer). In macroscopy, electrode catalysis layer is in structure of multiple layers for example at least divided into two layers structure. First layer structure as partial hydrophobic catalysis layer composed of first catalytic activity metal, water repellent and conducting ionic polymer. Second layer structure as hydrophilic catalysis layer composed of second catalytic activity metal and conducting ionic polymer. Composite two layers constitute partial hydrophobic and partial hydrophilic composite electrode. Advantages of the structure of electrode are: enhancing capability of mass transfer of gas, especially when air as oxidant, meanwhile keeping enough capability of electron conduction and proton transfer; extending effective triphase interface of catalytic reaction; raising output power density.

The invention relates to a metal-doped Na3V2(PO4)3 composite electrode material and a preparation method and application thereof. The metal-doped Na3V2(PO4)3 composite electrode material is a Na3V<2-x>M<x>(PO4)3 / C composite electrode material in a micro-nano composite particle shape. According to the preparation method, an organic matter carbon source is added and can be coated on a surface of Na3V<2-x>M<x>(PO4)3 / C precursor particle in an in-situ way during the hydrothermal process, can be used for preventing the Na3V<2-x>M<x>(PO4)3 / C precursor particle from being grown and agglomerated and also can be decomposed to amorphous carbon during the thermal treatment process, the formation core is Na3V<2-x>M<x>(PO4)3 / C particle, and a shell is a core-shell structure of the amorphous carbon. Themetal-doped Na3V2(PO4)3 composite electrode material has the advantages of favorable conductivity, excellent cycle stability, rate performance and the like. The metal-doped Na3V2(PO4)3 composite electrode material belongs to the field of an electrode material.

The invention discloses a detecting and processing method for validity of a link among multiple nodes, and belongs to the field of multi-node link transmission of a TETRA digital trunking system. A multi-node data mutual transmission link generally has multiple phenomena, including, long-term validity, link long-term disconnection, link recovery after disconnection, disconnection in link validity process, and alternate link disconnection and recovery. Due to the phenomena, various abnormal conditions for applications are aroused in a practical running process. The detecting and processing method for validity of the link among multiple nodes comprises the steps of calculating time when a heartbeat request is sent at each time; dispersing the time on a time grid; detecting the validity of the link in a preset period; and performing detection for link recovery by adopting a hypothetical recovery strategy in a link recovery process. Through the ways mentioned above, feedback of the validity of the link is added, and accurate guarantee is provided for link selection of the applications.

The invention relates to a preparation method of high iron slag power doped wave-absorbing foam concrete, wherein the preparation method comprises the step of mixing cement, a physical foaming agent, an addition agent, microfiber, a polycarboxylic acid efficient water reducing agent and water. The preparation method is characterized in that the addition agent is high iron slag power, wherein the high iron slag power and cement are mixed according to the mass ratio of (10-40):(60-90). The adopted material for preparing the foam concrete comprises the high iron slag power which belongs to byproducts in the steel smelting process, wherein the high iron slag power contains a great amount of ferric oxide components, has the properties of magnetism loss and dielectric loss, and can act as a wave-absorbing agent of a cheap building material; and the high iron slag power has wide sources, is low in price, can turn waste into wealth when being used as the building material, and achieves the aim of energy conservation and environment friendliness.

The invention relates to a Na3V2(PO4)3 cathode material for a sodium-ion battery as well as preparation and application of the cathode material. An intermediate phase with laminar morphology and highdegree of crystallinity is synthesized from cheap raw materials to serve as a template, and formation of a final product, namely, nanoscale Na3V2(PO4)3 with laminar morphology, is controlled. According to the preparation method, the raw material cost is low, the preparation process is simple and easy, Na3V2(PO4)3 synthesized from the intermediate phase as the template is of a flower-like structurestacked in a nanosheet shape, and shows excellent rate performance and excellent cycling stability when used as the cathode material to be applied to the sodium-ion battery.

The invention discloses a sodium ion gradient doped spinel structure positive electrode active material and a preparation method thereof. The sodium ion gradient doped spinel structure positive electrode active material comprises lithium-containing compound particles of which the chemical formula is Li < 1 + x > Na < y > Ni < 0.5-z > Mn < 1.5-r > O , wherein-0.2 < = x < = 0.2, -0.2 < = y < =0.2, -0.2 < = z < = 0.2, -0.2 < = r < = 0.2, and 3.8 < = u < = 4.2, the lithium-containing compound particles are doped with sodium ions, the concentration of the sodium ions is gradually reduced fromthe surface to the interior, and the doped precursor of the sodium ions is -COONa-containing organic sodium salt. With utilizing of the thickening, bonding, dispersing and stabilizing effects of theorganic sodium salt in the aqueous solution, the electrochemical performance of the spinel lithium nickel manganese oxide positive electrode material can be remarkably improved, the overall performance of the battery is optimized and improved, and the material has a wide application prospect in application and development of the spinel positive electrode material.

The invention provides an NCMA quaternary system material and a preparation method thereof, a lithium battery positive electrode material and a lithium battery. The NCMA quaternary system material comprises an NCMA quaternary positive electrode material and a coating layer, wherein the coating layer comprises Co3O4 and V2O5. The co-coating layer of Co3O4 and V2O5 not only can solve the problem ofresidual alkali on the surface of the material, but also can inhibit the dissolution of transition metal in the NCMA quaternary positive electrode material. Through the mutual synergistic effect of Co3O4 and V2O5, the charge transmission rate of the material body and the ion transmission rate between the material and the electrolyte are further improved, so that intercalation and deintercalation of lithium ions are promoted, side reactions of residual lithium and the surface of the NCMA quaternary positive electrode material are reduced, and the electrochemical properties such as capacity andstability of the NCMA quaternary positive electrode material are further improved.

The invention relates to a transparent wood with an optical regulation and control function and a preparation method thereof. The transparent wood comprises a transparent wood substrate and inorganicparticles with an optical regulation and control function uniformly dispersed in the transparent wood substrate, wherein the inorganic particles with the optical regulation and control function are selected from at least one of nano silver, nano vanadium oxide, nano cesium tungstate, nano ATO and nano ITO. According to the transparent wood provided by the invention, the characteristic of high hazeof the transparent wood is utilized, the propagation channel of light in the transparent wood matrix is increased, and the functional benefit of inorganic nano-particles with the same concentration is improved.

The invention relates to a preparation method of a silicon-based lithium ion battery negative electrode material. The preparation method comprises the steps of dissolving graphene oxide in water to obtain graphene oxide paste; adding an aniline monomer in the graphene oxide paste to obtain first mixed paste; adding phytic acid in the first mixed paste to obtain second mixed paste; adding silicon nano particles in the second mixed paste to obtain third mixed paste; adding an initiator in the third mixed paste to obtain fourth mixed paste; and coating and drying the fourth mixed paste directly to obtain the silicon-based lithium ion battery negative electrode material. The invention further provides the silicon-based lithium ion battery negative electrode material prepared by the mentioned method. The silicon-based lithium ion battery negative electrode material has a polyaniline skeleton porous microstructure wrapped by graphene oxide and stuck with silicon nano particles. The preparation method is simple, the production process is highly safe, the raw materials are abundant, the production cost is low, and the preparation method can be used for large-scale production.

The invention relates to a preparation method of a gel type polymer electrolyte framework material based on low-crystal porous nano fibers, and belongs to the field of polymer lithium ion batteries. The preparation method comprises the following steps: (1) preparing a blend type polymer electrostatic spinning solution; (2) preparing a blend type polymer nano fiber with a porous surface by utilizing an electrostatic spinning technique; and (3) drying and cutting a nano fiber film, and stacking and pressing to form a polymer gel electrolyte framework. According to the electrolyte framework frame, crystallization is inhibited via the blending of a polymer and an electrostatic spinning technology; the surface porous nano fiber and the film thereof have very high adsorption and long-lasting retentivity for electrolyte; the prepared gel type polymer electrolyte is high in ion conductivity and high in energy density, has a stable electrochemical window and good charge and discharge performances, and can be applied to the preparation of secondary lithium ion batteries.

The invention relates to a rare-earth-doped lithium manganese silicate positive electrode material and a microwave-assisted preparation method thereof. The preparation method mainly comprises the following steps that firstly, a certain quantity of lithium sources, manganese sources, silicon source compounds, carbon source additives and rare earth compounds serve as raw materials to prepare a rare-earth-doped lithium manganese silicate material precursor; secondly, the precursor is placed in a microwave field for microwave sintering under a protective gas atmosphere to obtain the rare-earth-doped lithium manganese silicate positive electrode material. According to the preparation method, the stability of the material is improved through the octahedral site preference energy characteristic of rare earth elements; the excellent wave absorbing property of the rare earth elements and microwave-assisted thermal treatment are combined, so that the wave absorbing property of the material is remarkably improved, then reaction frequency is increased when microwaves are propagated in a base material, a reaction can be conducted more sufficiently, the purity of the product is improved, and theelectrochemical performance of the material is further optimized; the synthesis period is shortened, and the production efficiency is improved.

The invention provides a sulfide solid electrolyte, a preparation method thereof and an all-solid-state battery. The chemical formula of the solid electrolyte is Li6PS5Cl1-x (BH4)x, and the preparation method comprises the following steps: uniformly mixing Li2S, LiCl, LiBH4 and P2S5 in proportion to obtain a mixture; placing the mixture in a ball milling tank for ball milling; and tabletting the ball-milled sample, and sintering to obtain the sulfide solid electrolyte. According to the sulfide solid electrolyte disclosed by the invention, a BH4 <-> anion group is introduced into the solid electrolyte to replace a part of Cl <-> sites, so that a larger transmission channel is provided; and the conduction of Li < + > is promoted by the unique rotary motion of the BH4 <-> anion group, and after the BH4 <-> anion group is introduced, the ionic conductivity of the electrolyte is greatly improved on the basis of a lithium-argyrodite electrolyte Li6PS5Cl.

The invention discloses a porous silicon / carbon shell composite material and a preparation method thereof. The porous silicon / carbon shell composite material comprises a porous silicon core and a carbon shell, wherein the outer wall of the porous silicon core is attached to the inner wall of the carbon shell, and discrete pores are maintained between the outer wall of the porous silicon core and the inner wall of the carbon shell. The preparation method of the porous silicon / carbon shell composite material comprises the steps of 1) mixing magnesium silicide, a carbon source and an organic solvent, uniformly dispersing, and heating until the organic solvent is completely volatilized to obtain an intermediate product; and 2) carrying out heat treatment on the intermediate product prepared inthe step 1) in a nitrogen atmosphere, and carrying out post-treatment to obtain the porous silicon / carbon shell composite material. The invention discloses a porous silicon / carbon shell composite material with a novel structure and a preparation method of the porous silicon / carbon shell composite material. The porous silicon / carbon shell composite material has excellent rate performance and cycleperformance and is expected to be widely applied to the field of lithium ion batteries.

The invention provides an optical module. The optical module includes a circuit board, a first driving chip, a first optoelectronic chip, a second optoelectronic chip, a second driving core and a lensassembly. The upper surface of the lens assembly is provided with a first groove and a second groove. The bottom surface of the first groove forms a reflecting surface; and the side surface of the second groove is provided with a first lens array and a second lens array which are arranged up and down. The first lens array and the second lens array which are arranged on the side wall of the secondgroove can increase an optical transmission channel, reduce the volume of the optical module, and reduce the manufacturing cost of the optical module. Since the light emitted or received by the firstoptoelectronic chip passes through the reflecting surface and the first lens array, the light emitted or received by the second optoelectronic chip passes through the reflecting surface and the second lens array, so that the reflecting surface can simultaneously reflect two sets of light to form two optical paths arranged up and down, and then the multi-channel simultaneous transmission of lightis achieved on the basis of increasing the optical transmission channel.

The invention discloses a positive plate, a preparation method of the positive plate, a solid-state lithium ion battery, a semi-solid-state lithium ion battery and a preparation method of the semi-solid-state lithium ion battery. The positive plate comprises a current collector and a positive electrode slurry layer covering the current collector, and a plurality of holes are formed in the positive electrode slurry layer. The positive electrode slurry layer comprises a positive electrode active material, a sulfide electrolyte material and a binder. According to the positive plate, a thick electrode is adopted, the loading capacity of the positive electrode is increased, meanwhile, a porous structure is adopted, the surface area of the positive plate is increased, transmission channels of lithium ions are increased, and the transmission performance of the lithium ions is improved. The preparation method of the positive plate reduces the cost of a battery. According to the semi-solid lithium ion battery, a lithium ion transmission channel is added, and a liquid electrolyte is injected, so that good contact between the solid electrolyte and the active substance can be ensured, the lithium ion transmission distance is shortened the dynamic performance of the battery is improved, and the low-temperature capacity, the normal rate capability, the normal-temperature cycle life and the 45 DEG C high-temperature cycle performance of the battery are improved.

The invention discloses a MIMO waveguide leaky cable comprising a waveguide tube and an outer sheath which sleeves the waveguide tube. The waveguide tube is internally provided with a metal baffle plate which is arranged along the length direction of the waveguide tube, and two sides of the metal baffle plate are fixed to an inner wall of the waveguide tube to divide the waveguide tube into a first waveguide and a second waveguide. First radiation slots are arranged on a waveguide tube of the first waveguide with equal intervals, second radiation slots are arranged on a waveguide tube of the second waveguide with equal intervals, and the first radiation slot and the second radiation slot have different polarization directions. According to the MIMO waveguide leaky cable, the metal baffle plate is added to one waveguide, the transmission performance of the waveguide is not affected, a transmission channel can be added in the condition of not increasing the size of the waveguide, the cost is greatly reduced, at the same time, two kinds of different radiation slots are opened on two half waveguides, different polarization directions are generated, an MIMO is formed, compared with a MIMO rectangular waveguide, the MIMO waveguide leaky cable can be formed into discs and is easier to transport, install and maintain.

The invention relates to a preparation method of oxygen-containing porous carbon aerogel, comprising the following steps: obtaining porous carbon aerogel through a conventional method, dispersing theporous carbon aerogel material in an aqueous solution of H2O2 and FeCl3 according to the concentration of 0.2-0.3 mg / ml with the molar ratio of H2O2 to FeCl3 being 1:1-1:4, uniformly stirring and mixing, adjusting pH to 2-4 by using a NaOH solution, treating by a plasma technology, carrying out suction filtration by using a mixed cellulose filter membrane after the reaction, washing with lots of deionized water to neutral level, collecting a powder, drying and grinding. The porous carbon aerogel provided by the invention has rich oxygen-containing functional groups, which can enhance wettability of the porous carbon aerogel in an electrolyte and can provide a pseudocapacitor having high capacitance.

The invention discloses preparation of argyrodite type solid electrolyte and application of the argyrodite type solid electrolyte in an all-solid-state battery. The general formula of the electrolyte is LiaMQ6-x (BH4) x, M is one or more of Sn, In, P, Si, Ge and As, Q is one or more of O, S, Se and Te, a is greater than or equal to 1 and less than or equal to 9, and x is greater than 0 and less than or equal to 6. The preparation method of the electrolyte comprises the following steps: mixing Li2Q, P2Q5, MQ2 and LiBH4, and carrying out ball milling to obtain an initial solid electrolyte; and further performing heat treatment on the initial solid electrolyte in a vacuum quartz tube to obtain the argyrodite type solid electrolyte. The existence of borohydride ions in the prepared electrolyte is beneficial for improving the conductivity and the stability of the electrolyte. Therefore, the all-solid-state lithium battery based on the electrolyte has high safety, energy density and stability.

The invention discloses a heteroatom-doped porous carbon positive electrode material for a lithium-sulfur battery and a preparation method of the material, and belongs to the technical field of lithium-sulfur battery positive electrode materials. The invention specifically relates to a double-heteroatom-doped porous carbon positive electrode material having high sulfur-loading capacity and capableof effectively inhibiting dissolution of polysulfide. The double-heteroatom-doped porous carbon material is prepared by taking a mixed metal organic framework material as a precursor, and is used asa positive electrode sulfur-loading material for the lithium-sulfur battery. Under the discharge rate of 0.2C, the specific discharge capacity is 1,187.6 mAh / g; and when the discharge rate is increased to 3C, the specific discharge capacity is still kept at 548.1 mAh / g. Charge-discharge cycles are carried out at the rate of 0.5C; and after 200 cycles, the specific capacity is 840 mAh / g, the capacity retention rate is 79.5%, and the coulombic efficiency can still be maintained to be about 98% after long-time charge-discharge testing. The heteroatom-doped porous carbon positive electrode material has relatively high practical application values.

The present invention discloses a double pole piece power type square nickel hydrogen battery, which comprises a shell and an electric core which is arranged inside the shell and comprises an anode plate, a cathode plate and a septum, wherein a margin is remained on the edge of one end of opposite direction of the anode plate and the cathode plate. The margin is welded with one side face of a current collector and the other side face of the current collector is welded with pole piece with different poles passing through the shell. The present invention adopts the non-traditional structure, wherein the anode and the cathode are respectively arranged on two end faces of the battery, thereby strengthening the transmission channel of the electric core and external current, reducing dynamical power consumption and inner resistance of the battery, increasing transmission performance for large current and prolonging circulation service life.

The invention discloses a preparation method of a SrTiO3 / SrSO4 / Pt double-heterojunction nano material. The preparation method comprises the following specific steps: preparing deionized water, glacialacetic acid and absolute ethyl alcohol as solvents and preparing strontium nitrate and tetrabutyl titanate respectively as a strontium source and a titanium source, wherein the added cysteine not only serves as a chelating agent, but also serves as a sulfur source; then preparing a precursor by adopting a sol-gel method, drying theprecursor in a drying box at low temperature for 48 hours, grinding the precursor, and annealing the precursor in a muffle furnace to obtain composite powder of strontium titanate and strontium sulfate; and finally, depositing a layer of platinum on the surface through a photodeposition method to form as a cocatalyst, and thereby the SrTiO3 / SrSO4 / Pt double-heterojunction nano material is obtained. The SrTiO3 / SrSO4 / Pt double-heterojunction nano material disclosedby the invention has a porous structure and a relatively large specific surface area, and can provide more active sites for a photocatalytic reaction; besides, the SrTiO3 / SrSO4 / Pt has very high activity on the precipitation of H2 under the illumination. The nano-material shows great development prospect in the field of photocatalysis.