240results about "Tin oxides" patented technology

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

The invention belongs to the technical field of preparation of sensor materials, and particularly relates to a room-temperature formaldehyde sensor material based on a catalytic principle as well as preparation and application of the room-temperature formaldehyde sensor material. The polyphenol is adsorbed on the surface of the semiconductor metal oxide through chelation, then noble metal ions are introduced, and the polyphenol on the surface of the semiconductor metal oxide can capture the noble metal ions and reduce and stabilize the noble metal ions on the surface of the semiconductor metal oxide; the noble metal nanoparticles are anchored on the surfaces of the semiconductor metal oxide nanoparticles, the original morphology of the semiconductor metal oxide is maintained, and the noble metal nanoparticles are loaded on the surfaces of the semiconductor metal oxide nanoparticles. The nano composite material not only has the intrinsic electrical and thermodynamic properties of semiconductor metal oxide, but also combines the catalytic characteristics of noble metal nanoparticles, so that the lower detection limit of formaldehyde is reduced to 3ppb, and the sensitivity of the sensor is remarkably improved. The preparation method of the room-temperature formaldehyde sensing material is simple and suitable for large-scale production, the raw materials are simple and easy to obtain, the cost is low, and the materials are environment-friendly.

The invention discloses a Ti / IrO2-SnO2-SbO2 gradient active coating anode with low cost and high stability and a preparation process of the Ti / IrO2-SnO2-SbO2 gradient active coating anode. The gradient active coating is characterized in that the gradient active coating is composed of 3-5 layers, the total thickness is 5-15 microns, the thickness of each layer is 1-5 microns, the molar percentage content of iridium in a bottom layer is 0-5%, the sum of the molar percentage content of tin and antimony is 95-100%, the molar percentage content of iridium in a surface layer is 10-20%, the sum of the molar percentage content of tin and antimony is 80-90%, and the thickness of each layer is 1-5 microns. The molar percentage content of iridium from the bottom layer to the surface layer is sequentially increased from 2% to 10%, the molar percentage content of tin and antimony is sequentially reduced from 2% to 10%, and the total iridium loading amount in the gradient active coating is 0.05-0.2 mg / cm < 2 >. The preparation method comprises the three steps of titanium substrate pretreatment, precursor salt alcohol solution preparation and gradient active coating preparation. By adopting a gradient coating mode, the thermal stress between the coating and the titanium substrate in the preparation process is remarkably reduced, the consumption of noble metal is reduced, the oxygen evolution activity of the anode is improved, and the service life of the anode is prolonged. The method is simple to operate and low in cost, and has remarkable industrialization advantages.

The invention relates to a preparation method of a pectin-derived carbon-coated amorphous tin-zinc composite oxide lithium ion battery negative electrode material. The method comprises the following steps: dropwise adding a tin tetrachloride solution and an acidified zinc oxide solution into a pectin solution to obtain a metal ion-pectin dispersion liquid; adding ammonia water to obtain a pectin precursor solution; freezing and solidifying with liquid nitrogen; and after freeze-drying, roasting for 3-5 hours to obtain the pectin derived carbon coated amorphous tin-zinc composite oxide lithium ion battery negative electrode material. The reversible specific capacity of the obtained composite material reaches 1339 mA h g <-1 > after 100 cycles under the current density of 0.2 A g <-1 >.

The invention discloses a double-metal gradient diffusion layer modified high-nickel ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: filtering and uniformly dispersing high-nickel ternary positive electrode material powder; introducing inert gas into the atomic layer deposition system, and raising the temperature to a target temperature; respectively preheating the metal precursors A and B to proper temperatures; the preparation method comprises the following steps: sequentially introducing a metal precursor A, precursor water, a metal precursor B and precursor water into a reaction chamber, alternately depositing according to a pulse-reaction-purging sequence, and repeatedly circulating the process to obtain the bimetallic oxide coated high-nickel ternary positive electrode material, and post-annealing treatment. According to the bimetal gradient diffusion layer modified high-nickel ternary positive electrode material prepared by the preparation method disclosed by the invention, the lithium storage performance of the high-nickel ternary material is greatly improved, excellent cycling stability and rate capability are obtained, the coating layer is accurate and controllable, the preparation process is simple, meanwhile, large-batch production can be realized, and relatively high application value is achieved.

The invention discloses a palladium-doped Ir-Sn oxide titanium anode with high catalytic activity and a preparation method of the palladium-doped Ir-Sn oxide titanium anode, and belongs to the technical field of electrolytic anodes. The anode comprises a titanium substrate, a TiO2-Ta2O5 intermediate layer and an Ir-Sn-Pd oxide catalyst layer, the molar ratio of Ir to Sn to Pd in the catalyst layer is (5-6): 3: (1-2), and the total metal ion concentration is 0.3 mol L. The preparation method is realized through titanium substrate pretreatment (sand blasting and etching), intermediate layer coating sintering (a TiCl4-TaCl5 solution) and catalyst layer circulating coating sintering (an H2IrCl6-SnCl4-PdCl2 mixed solution). The relatively cheap palladium element is introduced, the electron structure of the catalyst layer is optimized by utilizing the defect effect, the charge transfer resistance is reduced to 6.7 omegacm, and meanwhile, the iridium consumption is reduced by more than 30%. Experiments show that the cell voltage of the anode is stabilized at 0.95 V (the current density is 5Acm <-2 >), the accelerated life reaches 1630 hours, the coating binding force is 62N, and the corrosion rate in an acidic electrolyte is only 0.01 mm / year. Compared with a traditional iridium tantalum anode, the cost is reduced by 40%, and the overpotential in the oxygen evolution reaction is as low as 0.45 V.

The invention discloses a preparation method and application of a peptide microtube / SnO2 / Au composite gas-sensitive material. The three-dimensional network structure of the peptide microtube is utilized to effectively adsorb SnO2 and Au nanoparticles, so that the SnO2 and Au nanoparticles form a complete connection path on the surface of the peptide microtube, and electron transfer is facilitated; and gas diffusion is also facilitated. The localized surface plasmon resonance (LSPR) effect of Au nanoparticles can enhance visible light absorption and surface reaction activity, so that the gas-sensitive property is improved, and rapid adsorption and desorption reaction can be carried out at room temperature. The prepared sensor exerts the synergistic effect of the three materials, realizes efficient detection of NO2 at room temperature, has very high selectivity to NO2, and has relatively high response to low-concentration NO2, so that trace detection can be carried out.

The invention discloses a nitric acid type system tin stripping liquid centralized recovery treatment process which comprises the following steps: firstly, adding a cationic coagulant into a nitric acid type tin stripping waste liquid, filtering through a 5-micron filter membrane, discharging into a reaction kettle, and adding a H2O2 solution with the concentration of 5-10%; the pH is adjusted to 2.0-2.5, and copper is removed under the condition of 40-50 DEG C; when the pH value is increased from 2.5 to 3.0-3.5, iron is removed; adjusting the pH value to 13.0-13.5, heating to remove aluminum, and separating to obtain a filtrate containing Na2SnO3; adjusting the pH value of the filtrate to 6.0-6.5, heating to 70-75 DEG C for reaction, and then carrying out gradient cooling to room temperature to generate Sn (OH) 4 precipitate; and centrifugally separating the mixed solution to obtain a tin-containing solid and a tin stripping regenerated solution, and firing the tin-containing solid to obtain a tin dioxide solid. Compared with a traditional process, copper is removed firstly, then iron is removed, aluminum is finally removed, and directional removal is achieved through the difference of precipitation conditions.

The invention provides a Bi-doped SnO catalyst and a preparation method and application thereof, a gas diffusion electrode and a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: mixing divalent metal tin salt, a regulator and bismuth salt in water to obtain a mixed solution; and mixing the mixed solution with a sodium hydroxide solution, and reacting to obtain the Bi-doped SnO catalyst. The preparation method is simple, rapid, low in cost, green and free of organic solvent or high-temperature treatment, and the prepared catalyst is stable in structure and lasting in performance. The Faraday efficiency of a gas diffusion electrode prepared by adopting the Bi-doped SnO catalyst for synthesizing formic acid through electrocatalytic reduction of CO2 at-850 mA / cm < 2 > is as high as 98%, the gas diffusion electrode can stably run for more than 140 h under N2 purging in a solid electrolytic tank, and the concentration of formic acid continuously produced exceeds 5 mol / L.

The invention discloses a negative electrode material for improving the cycle performance of a lithium battery, a preparation method of the negative electrode material, a negative electrode plate and a battery, and the preparation method comprises the following steps: S1, growing SnO2 on a carbon nanotube through a hydrothermal synthesis method to form a one-dimensional composite material SnO2 (at) CNT; s2, Zr ions and a silane coupling agent are introduced into the one-dimensional composite material SnO2 (at) CNT, and the modified SnO2 (at) CNT material is obtained. According to the invention, the cycle life of the lithium battery using the stannic oxide negative electrode material is prolonged through material composite modification.

The invention provides a SnO2 / expanded graphite composite material as well as a preparation method and application thereof, belongs to the technical field of sodium ion batteries, and aims to solve the technical problems of low specific capacity of expanded graphite and unstable SnO2 cycle performance. The preparation method of the SnO2 / expanded graphite composite material comprises the following steps: (1) mixing expandable graphite, soluble tin salt and a solvent to obtain a mixed solution; (2) evaporating the mixed solution to dryness to obtain a graphite intercalation compound; and (3) carrying out microwave heating on the graphite intercalation compound to obtain the SnO2 / expanded graphite composite material. The SnO2 / expanded graphite composite material prepared by the invention is used as a sodium-ion battery negative electrode material, can effectively overcome the defect of poor capacity when a carbon material is independently used and the defects of low conductivity and poor cycle performance when SnO2 is independently used, can synergistically exert the sodium storage advantages of the metal oxide and the expanded graphite, makes up the respective defects, and can be used for preparing the sodium-ion battery negative electrode material. Therefore, the electrochemical performance of the sodium-ion battery is improved.

The invention discloses a preparation method and application of a nano heat-insulating metal oxide composite coating. The preparation method comprises the following steps: preparing a nano ATO crystal of which the surface contains silicon hydroxyl; preparing polymerizable ATO (antimony tin oxide) nano particles; and uniformly mixing the polymerizable ATO nano particles, the silane modified nano silicon dioxide, the self-emulsifying polyurethane emulsion and the auxiliary agent to obtain the required coating. Nanometer ATO crystallization and surface silicon hydroxyl modification are synchronously completed in a hydrothermal environment, and the problem of uneven coating caused by traditional two-step modification is solved; after the high-temperature reaction, cold ethanol is used for realizing shock cooling to stop crystal growth, so that the problem of thermodynamic instability of the nanocrystalline is solved; the interfacial compatibility is improved by introducing a vinyl-containing siloxane monomer; by compounding the polymerizable ATO nano particles, the silane modified nano silicon dioxide, the self-emulsifying polyurethane emulsion and the auxiliaries, a stable topological structure connected by covalent bonds is constructed, and the aging resistance, the heat insulation property and the adhesive force of the coating are remarkably improved.

The invention discloses a nitrogen plasma vapor deposition modified metal oxide catalyst and a preparation method and application thereof.The preparation method of the catalyst comprises the steps that tin salt, CTAB and ammonia water serve as raw materials, SnO2 is prepared through a solution gel method, then the preliminarily-prepared SnO2 is calcined in the air atmosphere, purer SnO2 is prepared, and the catalyst is used for preparing the metal oxide catalyst. And finally, carrying out chemical vapor deposition modification on SnO2 by utilizing high-energy-state N * plasma to prepare the catalyst. The nitrogen-doped tin dioxide catalyst is synthesized on the basis of a chemical vapor deposition method strategy, and the catalyst shows extraordinary performance of electrocatalytic oxygen reduction for synthesis of hydrogen peroxide in an alkaline medium, has good stability and a wide potential window, and has potential application prospects in the field of electrochemical preparation of hydrogen peroxide.

A modified metal oxide particle sol, when applied as a coating onto a substrate, is capable of having transparency, a high particle refractive index and good coat resistivity. The modified metal oxide particle sol is composed of modified metal oxide particles (iii) in which stannic oxide particles (i) having an average primary particle size of 4 to 50 nm serve as cores and are coated with metal oxide particles (ii) of at least one metal oxide selected from the group consisting of antimony oxide, stannic oxide and silicon oxide and having an average primary particle size of 1 to 10 nm, which modified metal oxide particles (iii) are dispersed in an organic solvent. The average primary particle size of the core particles (i) and the average primary particle size of the coating particles (ii) satisfy the relationshipsize of core particles(i)≥size of coating particles(ii),the ratio (total weight of metal oxides other than stannic oxide) / (weight of stannic oxide) is from 0.005 to 1.0, and the sol includes an amine (a) having a water solubility of 0.1 g / L or more and an amine (b) having a water solubility of less than 0.1 g / L.

The invention discloses a multi-dimensional carbon structure negative electrode material, and belongs to the field of lithium battery materials. The multi-dimensional carbon structure negative electrode material comprises a core layer, a middle layer and a shell layer which are sequentially arranged from inside to outside, the core layer comprises a three-dimensional conductive skeleton loaded with active particles; the material of the middle layer comprises amorphous carbon; the material of the shell layer comprises a metal oxide. The negative electrode material with the core-shell structure is obtained by preparing the multi-layer structure containing the core layer, the middle layer and the outer layer and optimizing the material of each layer. The outer layer and the middle layer can effectively inhibit disordered deposition of metal lithium on the outer surface, active particles of the core layer serve as lithium-loving sites to guide lithium to be nucleated and deposited in fiber coils preferentially, the uniformity and directionality of lithium deposition can be improved through cooperation of the three layers, and therefore growth of lithium dendrites is effectively inhibited; and the safety performance and the cycling stability of the prepared battery are enhanced.

The present invention relates to an inverted perovskite prepared by providing a surface-modified metal oxide nanoparticle as a coating agent for forming an electron transporting layer (or electron transport layer), and using the surface-modified metal oxide nanoparticle as a coating agent prepared in a dispersion type.

The present invention discloses a H2 sensor material based on SnO2-doped graphene aerogel and a preparation method. The material comprises mixing graphene oxide with N,N-dimethylformamide and water to form a mixed solution, adding the mixed solution to a tin salt solution, performing a solvothermal heat treatment, and then calcining the solution in a muffle furnace. The present invention dopes the graphene aerogel with SnO2 nanoparticles. The graphene aerogel structure modifies the operating characteristics of the tin dioxide material, resulting in a sensor material with high gas sensitivity, good selectivity, and stability. This reduces the sensor's operating temperature and device power consumption, resulting in ultrahigh sensitivity, anti-interference performance, and good resistance to electrolyte corrosion. The material has broad application prospects in the future field of thermal runaway early warning technology for lithium-ion batteries.

The present invention relates to a coating agent for forming an electron transport layer (or electron transfer layer), which provides surface-modified metal oxide nanoparticles as a dispersion-type coating agent, and relates to an inverted perovskite-based electron transport layer formed using the coating agent.

The present invention provides a method and apparatus for synthesizing oxygen-vacancy nano-tin oxide using waste raw materials. The method uses industrial and agricultural waste as raw materials and realizes the preparation of oxygen-vacancy nano-tin oxide through self-propagating high-temperature synthesis technology and the regulation of a flowing mixed atmosphere with an oxidizing function. The nano-tin oxide product prepared by the present invention has the advantages of high purity, good dispersibility, adjustable oxygen vacancy content, and good photocatalytic performance. While proposing a method for preparing nano-tin oxide with adjustable oxygen vacancy content, the method and apparatus provided by the present invention reduce the energy consumption and raw material costs of existing oxygen-vacancy nano-tin oxide production, improve its production efficiency, and achieve safe disposal of waste, greatly reducing environmental pressure. It has good economic and environmental benefits and has broad prospects for promotion and application.

Tin tetrachloride pentahydrate, zinc nitrate hexahydrate and dimethylimidazole are used as raw materials, methanol is used as a solvent, and the tin-zinc bimetallic oxide, which is named Sn-Zn-O for short, is obtained through stirring, centrifugal drying and calcining; the material is an n-type semiconductor, and the chemical composition of the material is SnO2 and ZnO. The microstructure of Sn-Zn-O is a nano microsphere, and the particle size range of the Sn-Zn-O is 100-250 nm. The invention relates to a preparation method of a hydrogen sensor based on Sn-Zn-O, namely when the Sn-Zn-O is used as the hydrogen sensor, the optimal working temperature is 180 DEG C, the response value is 112 when the hydrogen concentration is 1000 ppm, the response time is 1.29 s, and the recovery time is 147 s. When the hydrogen concentration range is 0.1-2000ppm, the hydrogen sensor has different responses to hydrogen with different concentrations, and the lowest hydrogen concentration is detected to be 0.1 ppm.

What is provided is a tin recovery method for recovering tin from a tin-containing material, the method including: an oxidation leaching step of performing oxidative leaching of tin in a tin-containing material into a leachate composed of an acidic solution of sulfuric acid to obtain a post-leaching liquid containing tin; an oxidation step of adding a substance that supplies sodium chloride and divalent copper ions to the post-leaching liquid obtained in the oxidation leaching step and oxidizing divalent tin ions contained in the post-leaching liquid to tetravalent tin ions; and a neutralization step of neutralizing the post-leaching liquid after the oxidation step to obtain a tin-containing precipitate.

The invention discloses a method for realizing degradation of polyalkylene oxide compounds and controllable molecular weight through a promoter, which comprises the following steps: adding a photodegradation promoter into a high-molecular-weight polyalkylene oxide product, adjusting the proportion of the promoter and the proportion of effective components, and accurately controlling the shear molecular weight under the irradiation of an ozone emitter, so that the molecular weight of the polyalkylene oxide compounds is controllable. According to the invention, polyalkylene oxide with different molecular weights of 30,000-3,000,000 is prepared by using the photodegradation cocatalyst, so that the photodegradation cocatalyst can meet the requirements of customers in different fields, and meanwhile, the photodegradation cocatalyst prepared by the invention can be recycled to achieve the benefits of reducing cost and improving efficiency.

The application provides a core-shell heterogeneous gradient structure anti-ionizing radiation powder and a preparation method and application thereof, and belongs to the field of radiation protection. The preparation method of the core-shell heterogeneous gradient structure anti-ionizing radiation powder comprises the following steps: adding a high-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a core layer; adding the core layer and a low-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a preliminary wrapped powder in which a low-atomic-number metal wraps a high-atomic-number metal core layer; adding the preliminary wrapped powder and a rare earth salt into deionized water, sequentially performing aging, washing, drying, primary calcination, secondary calcination, airflow pulverization and air rotation blowing to obtain the core-shell heterogeneous gradient structure anti-ionizing radiation powder. Through the synergy of the core-shell heterogeneous structure, high-atomic-number and low-atomic-number oxides and multiple rare earth elements, the shielding performance of the material is significantly improved.

This invention provides a method for recovering indium fluoride and tin oxide from waste ITO targets, belonging to the field of indium tin oxide waste target recycling technology. The method includes: acid leaching of powdered ITO waste targets with hydrofluoric acid to obtain an acid leaching slurry containing indium fluoride and tin oxide; vacuum distilling the acid leaching slurry to obtain indium fluoride gas and tin oxide solid, respectively; the vacuum distillation temperature is 1000–1100°C; the vacuum degree of the vacuum distillation is 5–20 Pa; the indium fluoride gas is vacuum condensed to obtain indium fluoride solid; the condensation temperature is 700–800°C; the purity of the tin oxide solid is >99.999%; and the purity of the indium fluoride obtained by vacuum condensation is >99.99%. The method provided by this invention has low energy consumption, no carbon emissions, low cost, and high added value, enabling the conversion and recycling of waste materials into high-value materials.

The present invention discloses a solvothermal method for synthesizing SnO2 nanoparticles in one step. The method comprises adding acetylacetone to isopropyl alcohol as a mixed solvent, adding tin tetrachloride, stirring thoroughly, reacting in a reactor at 180-220°C for 12-24 hours, naturally cooling, separating, washing, and drying to obtain SnO2 nanoparticles. The preparation method of the present invention has the advantages of mild reaction conditions and a simple and easy method. The SnO2 nanoparticles synthesized by the method have broad application prospects in fields such as perovskite solar cells, photocatalysis, and gas sensing.

Provided are: a tin oxide particle dispersion liquid in which tin oxide particles are dispersed in a solvent, the tin oxide particle dispersion liquid being characterized in that the Zeta potential at pH 10 is-35 mV or less; the tin oxide particle dispersion liquid is capable of forming a tin oxide particle laminated film in which tin oxide particles are uniformly arranged and which has excellent electrical conductivity. The tin oxide particles may be doped with a heterogeneous element. It is preferable that the dissimilar element is one or more elements selected from among antimony, fluorine, and phosphorus. The primary particle diameter of the tin oxide particles is preferably in the range of 1.5 nm or more and 100 nm or less.

The invention belongs to the technical field of gas sensor detection, and particularly relates to an EMC gas component prediction method based on a V2 / V2O5 / SnO2 sensor and GRU-Attention. The EMC gas component prediction method comprises the following steps: S1, preparing multiple layers of V2C MXene; s2, preparing a V2 / V2O5 / SnO2 composite material; s3, preparing a gas sensor; s4, measuring a resistance signal; and S5, establishing a GRU-Attention gas detection model. The V2C / V2O5 / SnO2 heterojunction gas-sensitive film is successfully synthesized, and the heterojunction provides a large number of adsorption and reaction sites for methyl ethyl carbonate molecules at a low temperature of 150 DEG C through a synergistic effect among high conductivity of V2C, excellent gas-sensitive characteristic of SnO2 and catalytic activity of V2O5; the sensor prepared by the invention has remarkably improved gas sensitive response, high response / recovery speed and low detection limit, and realizes efficient detection of EMC gas in a wide concentration range.

The utility model relates to the field of gas inlet devices of tube furnaces, in particular to a distributed gas inlet device for a tube furnace. Comprising a furnace tube system, the furnace tube system comprises a furnace tube body, flanges are fixedly connected to the two ends of the furnace tube body, a heat insulation furnace plug is arranged in the furnace tube body, a distributed air inlet device is arranged in the heat insulation furnace plug, the distributed air inlet device comprises an air inlet pipe, and the air inlet pipe is installed in the heat insulation furnace plug. A flow guide base disc is installed at the end, close to the furnace tube body, of the air inlet pipe, a distributed air inlet disc is installed on the arc face of the flow guide base disc, a transmission shaft is installed in the distributed air inlet disc, a plurality of flow guide rotary pieces are installed on the arc face of the transmission shaft, and a connecting ring is installed on the arc face of the transmission shaft. The distributed air inlet device for the tubular furnace has the advantages that the uniformity and the stability of air inlet of the tubular furnace are improved, and the process effect and the product quality are improved.

The present invention relates to a thermoelectric textured film that exhibits electrical and thermal conductivity, and a method for producing the textured film. The textured film obtained by this method exhibits electrical and thermal conductivity, as well as high resistance to high temperatures and oxidation, and therefore these films can be used in many fields, such as electrical circuits, thermal barriers, thermoelectric applications, and lighting.

The invention discloses a preparation method of a 3D graphene-loaded tin oxide composite material. The preparation method comprises the following steps: preparing a precursor solution from graphene oxide, tin tetrachloride pentahydrate and ascorbic acid; dropwise adding a lauryl sodium sulfate solution into the precursor solution, and fully mixing to obtain a mixed solution; transferring the mixed solution into a glass bottle, and sealing and heating to promote the self-loading process of the solution; performing freeze thawing / 80 DEG C thermal reduction treatment on the preformed sample to form a preliminary composite material of tin oxide and graphene; repeatedly washing the sample subjected to thermal reduction by using ethanol to remove residual impurities, and then carrying out drying treatment; and carrying out annealing heat treatment on the dried sample in a nitrogen atmosphere to obtain the 3D graphene-loaded tin oxide composite material. The preparation method of the 3D graphene loaded tin oxide composite material provided by the invention is simpler in preparation process, lower in cost and suitable for large-scale industrial production.