55results about How to "Small performance degradation" patented technology

The invention belongs to the field of solar cells, and particularly relates to a hole transport layer, a perovskite solar cell and a preparation method. The hole transport layer comprises a NiOx layer and a self-assembly molecular layer, wherein the self-assembly molecular layer comprises a self-assembly molecular material and a surfactant. The perovskite solar cell comprising the hole transport layer has the advantages of high efficiency, high stability, low production cost and simple preparation process.

The invention provides an X-ray photovoltaic radiation cell based on a gallium-containing semiconductor and a preparation method of the X-ray photovoltaic radiation cell. The gallium-containing semiconductor X-ray radiation photovoltaic cell comprises a gallium-containing semiconductor transduction unit and an X-ray radiation source 55Fe arranged on the semiconductor transduction unit, wherein the semiconductor transduction unit containing gallium comprises at least one of GaAs (gallium arsenide), GaInP (gallium indium phosphide), GaP (gallium phosphide) and Ga2O3 (gallium trioxide). According to the invention, the structure of a radiation photovoltaic cell is adopted, the output power density of an X-ray radioactive source 55Fe can be effectively improved, the penetration depth of the X-ray source 55Fe in a semiconductor can be effectively shortened by taking GaAs, GaInP, GaP and Ga2O3 as semiconductor materials, and meanwhile, the collection capability of current carriers is effectively improved by adjusting the total thickness of a semiconductor transduction unit and the doping concentration of each layer, so that the performance of the X-ray source 55Fe is improved. And finally, the preparation of the X-ray radiation photovoltaic cell with high output power and high energy conversion efficiency is realized.

The invention belongs to the technical field of hydrogen production system operation optimization, and provides a multi-reactor electrolytic hydrogen production system operation optimization method and system.The method comprises the steps that the input power of a multi-reactor electrolytic hydrogen production system is divided in a segmented mode from small to large according to the power size, the power is divided into a starting power section, an optimal power section, a rated power section and an overload power section; in each section, based on the SOH (state of health) of the battery, reordering the electrolytic stacks according to the real-time SOH within a set time interval; and according to the sequence of the starting power, the optimal power, the rated power and the overload power, the running power of the electrolytic stacks is calculated in the section in sequence according to the input power of the multi-electrolytic-stack electrolytic hydrogen production system, and power distribution is conducted on the electrolytic stacks according to the running power of the electrolytic stacks. According to the invention, the energy utilization rate is increased, the operation cost is reduced, and the method has important influence on the economy of an electrolytic hydrogen production system.

The invention discloses a fuel cell low-temperature shutdown purging method, device and system.The purging method comprises the following steps that whether the temperature of an electric pile cooling liquid outlet meets the low-temperature purging condition or not is judged, and the purging process is as follows: step (1), the fuel cell is set to run under the condition of 0.15-0.18 standard current density; dry hydrogen and air are respectively introduced into an anode and a cathode of the battery during the period; (2) operating the fuel cell under the condition that the standard current density is 0.15-0.18; (3) operating the fuel cell under the condition that the standard current density is 0.10-0.12; step (4), operating the fuel cell under the condition that the standard current density is 0.05-0.08; (5) operating the fuel cell under the condition that the standard current density is 0.03-0.04; and step (6), loading 0.03 to 0.04 standard current density. The method can effectively reduce the initial water content of the stack, improve the cold start success rate of the stack, improve the durability of the stack and slow down performance degradation.

The application discloses a kind of air-cooled fuel cell humidification systems and its control method, solve the problem of air-cooled stack humidification system structure complex, uneven gas intake in prior art.The application includes humidification cavity with water injection port and gas outlet;First homogenizing cavity is used to flow through gas and guide;Second homogenizing cavity is arranged on the first homogenizing cavity;Fan is arranged on the first homogenizing cavity for conveying gas into the first homogenizing cavity;Moisture guide mechanism one end is connected with gas outlet, the other end is connected with the first homogenizing cavity;Air-cooled stack is arranged on the second homogenizing cavity gas outlet end;Controller is connected with fan, moisture guide mechanism and air-cooled stack respectively.The application is controlled by fan, moisture guide mechanism, air-cooled stack and controller cooperation, controller controls the operating power of fan and moisture guide mechanism according to the power of air-cooled stack, to control the humidification amount of air-cooled stack, reduce the performance attenuation of air-cooled stack, improve the stability of air-cooled stack.

This application provides a self-healing polyurethane material, its preparation method, and its applications, relating to the field of polymer materials technology. The material uses a polyurethane matrix constructed from polyols and polyisocyanates, and introduces aromatic polyaldehyde compounds to form reversible dynamic bond structures with hydrazine compounds, thereby endowing the material with excellent self-healing properties. By controlling the type of chain extender and the melt blending process conditions, the material can achieve crack healing and restore mechanical properties after damage, while also possessing good flexibility, processability, and stability. The preparation process of this application is simple and the conditions are mild. The resulting material can be widely used in coatings, seals, and elastomers, significantly improving material service life and reliability.

The present application relates to a method, device, electronic device and storage medium for determining the health status of a battery. The method comprises: obtaining the cell voltage of each cell in the target battery pack when the cell is offline, the battery pack is offline, the vehicle is offline and the first charging of the vehicle is completed; obtaining the duration information of the three stages from the cell offline to the battery pack offline, the battery pack offline to the vehicle offline, and the vehicle offline to the first charging of the vehicle; when the target battery pack is in a long-term storage state, determining the voltage change rate of each stage based on multiple cell voltages and multiple duration information; determining the target health status of the target battery pack when the vehicle is offline based on the voltage change rate and the average health status obtained in advance. The use of this method can improve the accuracy of the health status measurement of the battery pack when the battery pack and the vehicle are offline, thereby reducing the cumulative error generated in the subsequent calculation of the state of charge.

The invention relates to the technical field of membrane separation, in particular to a functional group regulated covalent organic framework (COF) membrane and a preparation method thereof, and relates to application of the membrane in selective separation of monovalent cations. The preparation method comprises the following steps: condensing a polyaldehyde monomer and aromatic diamine with different side chain substitutions on an interface through oil-water-oil three-phase interface micro-fluidic dripping to generate a two-dimensional COF nanosheet, carrying out ultrasonic dispersion, carrying out vacuum filtration, self-assembling on a porous substrate, and drying to obtain a continuous separation layer with the thickness of 50-150nm. The functional group can regulate and control pore channels and surface charges, flux and selectivity of monovalent cations such as Li < + > can be adjusted, effective separation is kept at the pH of 3-11, and the functional group is suitable for lithium salt extraction and electrolyte purification.

The utility model discloses a Mylar film structure for aluminum shell battery, aluminum shell battery and electronic product belong to battery technical field, including Mylar film body, Mylar film body includes first cladding piece, second cladding piece and the connecting cladding piece of first cladding piece and second cladding piece are connected respectively, recesses is formed in first cladding piece and is used to store the first liquid storage groove of electrolyte, recesses is formed in second cladding piece and is used to store the second liquid storage groove of electrolyte, first liquid storage groove and second liquid storage groove all are located on the side surface of battery roll core. The utility model reaches the technical effect of improving diffusion efficiency, and promotes the long -term cycle performance of battery.

This invention provides a water surface photocatalytic oxidant release device, belonging to the field of photocatalytic equipment technology. It includes a main structure with an internal reaction chamber. The chamber has an inlet and an outlet at both ends, respectively, both communicating with the reaction chamber. An oxidant release membrane, a sulfonated polyethersulfone selective permeation membrane with a pore size <1 nm, is located at the outlet. The reaction chamber contains a catalyst support and a light source system. The catalyst support is made of porous ceramic and loaded with a g-C3N4 catalyst. The light source system includes an LED board fixed in the center of the catalyst support and surrounded by it. The LED board has a ring-shaped array of blue LED beads emitting light of a specific wavelength of 450-470 nm. An energy and control compartment is located inside one side wall of the main structure, housing a battery pack and a control unit board. This invention can significantly improve environmental benefits and treatment efficiency, and greatly enhance long-term operational stability and economic efficiency.

The utility model discloses a kind of anti-glare ceiling down lamp, including outer shell and metal panel, the surface of the outer shell is evenly provided with radiating fin, the inner side of outer shell is installed with reflecting sphere by support ring, and the both sides of the reflecting sphere are provided with mirror coating and diffuse reflection coating, the inner wall of the outer shell outside reflecting sphere is provided with inner bowl body, the inner wall of inner bowl body is provided with nano light guide plate;The opening of the outer shell is provided with metal panel, the center of metal panel is provided with hole, the inner side of hole is installed with light transmission lens, and the inner wall of metal panel outside hole is provided with annular groove, annular groove is installed with LED lamp ring by heat-conducting double-sided adhesive tape inside it.The utility model can significantly improve anti-glare effect by this multilayer light processing mechanism, provide more comfortable light environment.

The present invention relates to the technical field of quantum dot light-converting agricultural film, and in particular to a quantum dot light-converting agricultural film doped with metal nanoparticles and a preparation method thereof, the steps comprising preparing quantum dot materials by a one-pot method; preparing metal nanoparticles by a chemical reduction method; doping metal nanoparticles into quantum dot materials and mixing them to obtain a quantum dot colloidal solution doped with metal nanoparticles; mixing the quantum dot colloidal solution with a polymer material and adding them to an extruder, and performing high-temperature melt granulation to obtain a quantum dot light-converting agricultural film by a film blowing machine. The above method dopes metal nanoparticles such as gold and silver on the basis of traditional quantum dot light-converting agricultural films. Due to the plasma resonance effect on the surface of the metal nanoparticles, the performance attenuation of quantum dots in the long-term degradation process can be reduced, and the stability of quantum dots can be improved; at the same time, the electric field can be strengthened, the recombination of electrons and holes in quantum dots can be accelerated, and the luminescence intensity of quantum dots can be enhanced.

The present application provides a kind of UV reinforced polyvinyl butyral modified asphalt and its preparation method.The modified asphalt is based on matrix asphalt, polyvinyl butyral, photoinitiator and crosslinking aid are added, and the uniform dispersion and crosslinking reaction of polyvinyl butyral in asphalt system are promoted by UV light, so as to improve the ultraviolet aging resistance, bonding strength and weather resistance of asphalt.The preparation steps include: heating the matrix asphalt to 140-190℃, adding polyvinyl butyral shear stirring, then adding photoinitiator and crosslinking aid, and continuing to stir under UV light to form a uniform modified asphalt system.The method can significantly improve the aging resistance, high temperature stability and low temperature crack resistance of modified asphalt, and is suitable for road paving, bridge waterproofing and other high durability engineering fields, and has good industrial application prospect.

This utility model relates to the field of lithium battery technology, and proposes a soldering structure and a cylindrical lithium-ion battery. The soldering structure includes multiple parallel and spaced solder lines, and the solder lines are wavy in shape. The width W1 of the soldering structure is 1.6-3.4 mm; the minimum distance W10 between two adjacent solder lines is 0.6-1.1 mm. By controlling the reasonable size of the soldering, problems such as welding explosions and discoloration of solder lines caused by heat concentration due to excessively small soldering can be avoided. At the same time, excessively large soldering can prevent the increase in laser travel, the reduction in welding efficiency and production capacity, and the decrease in welding reliability caused by the expansion of the solder line area, thereby effectively improving welding quality and efficiency.

The application discloses a perovskite solar cell stability enhancement system based on multi-modal machine learning, and belongs to the technical field of machine learning. The system comprises a dynamic acquisition module, a multi-modal fusion analysis module, an instruction generation module and a control module. The dynamic acquisition module acquires real-time data and internal structure change characteristics. The multi-modal fusion analysis module performs dynamic characteristic weight distribution on each parameter in the real-time data according to the internal structure change characteristics, and obtains a real-time degradation risk probability value. The instruction generation module generates a comparison result based on the real-time degradation risk probability value, and generates a control instruction according to the comparison result. The control module converts the control instruction into a control signal, and adjusts the parameters of a preset environment cabin and a control battery manufacturing device. The multi-modal fusion analysis module and the instruction generation module are arranged, the prediction deviation is significantly reduced, and the optimization instruction delay bottleneck is broken through.

The invention discloses a preparation method of an organic-inorganic hybrid phase change energy storage material, belonging to the technical field of energy storage material processing. The invention comprises the following steps: adding polyethylene glycol, tridecanedioic acid, toluene and a catalyst into a reactor and stirring, raising the temperature of the reactor to 80-90°C, and keeping the temperature for reaction for 6-8h; during the reaction, removing by-products through a water separator, and post-processing to obtain modified polyethylene glycol. The invention improves the energy storage performance of polyethylene glycol and the outer shell structure of the phase change energy storage material by optimizing the thermal conductivity and load performance of the load carrier, thereby effectively improving the anti-leakage performance and energy storage density of the phase change energy storage material, and also improving the thermal conductivity and thermal cycle stability of the phase change energy storage material.

The invention discloses a preparation method of a catalyst for producing hydrogen peroxide through oxygen deficiency tandem piezoelectric-mechanical redox, and the preparation process of the catalyst comprises the following steps: firstly, constructing a zinc oxide substrate with a litchi-shaped structure through a water-phase thermally-induced self-assembly reaction; then introducing oxygen defects with controllable content on the surface of zinc oxide by adopting a liquid-phase mediated chemical reduction mode; and finally, performing in-situ auto-polymerization on the surface of the defective zinc oxide to form a polydopamine coating, thereby obtaining the target catalyst. The catalyst can efficiently and highly selectively prepare hydrogen peroxide through ultrasonic excitation under the conditions of pure water and normal temperature, has the advantages of mild reaction conditions, high generation rate, good stability, environmental protection and the like, and is suitable for the application scene of distributed hydrogen peroxide in-situ preparation.

The present application belongs to the technical field of passive multi-physical field cooperative control, and particularly relates to a multi-field cooperative passive control device and method based on rigid geometric contour constraint natural air cavity phase change. The device comprises a first rigid member and a second rigid member, which form fixed, sliding or rotating cooperation, and are provided with a cooperation micro-gap of 0.02 mm to 0.2 mm therebetween; the rigid geometric air cavity coupling part is integrally formed on the cooperation surface and has a rigid geometric contour for constraining air cavity phase change evolution. Under external physical field excitation or relative motion, local negative pressure is formed in the micro-gap, natural air cavity periodic phase change is induced, the phase change path and pressure evolution are uniformly constrained by the rigid geometric contour, and the multi-field cooperative passive control of heat-flow-force-sound is realized in a single structure. The present application replaces the traditional discrete components with pure rigid structure, has no elastic element, no friction pair and no electric control unit, and is reliable in all working conditions.

The invention relates to the technical field of high polymer materials, in particular to a regenerated polyester material based on a Diels-Alder dynamic covalent network and a preparation method thereof, and the preparation method comprises the following steps: S1, preparing maleic anhydride grafted regenerated polyethylene glycol terephthalate marked as RPET-MA; the RPET-MA and furfuryl amine are subjected to a reaction, and RPET-F is obtained; s2, the RPET-F and bismaleimide are subjected to a reaction, and the regenerated polyester material is obtained. The method disclosed by the invention has the beneficial effects that a thermally reversible Diels-Alder dynamic covalent network is successfully constructed in regenerated polyester through a two-step method of firstly grafting a furan group and then cross-linking with BMI. The problem of performance degradation caused by thermal mechanical degradation of RPET is solved, and the material has reprocessing and self-repairing capabilities while maintaining mechanical properties.

The present application belongs to the technical field of polishing equipment, and relates to a mold polishing and grinding equipment. The present application comprises a workbench, a first mounting frame is arranged above the workbench, a mounting rod is horizontally slidably arranged on the first mounting frame, a second mounting frame is rotatably arranged on the mounting rod, polishing assemblies are arranged at the upper and lower ends of the second mounting frame, each polishing assembly comprises a rotating column rotatably arranged on the second mounting frame and a polishing disc arranged at the end of the rotating column, a driving assembly is arranged on the mounting rod to drive the second mounting frame to rotate, so that the positions of the two polishing assemblies are exchanged. By exchanging the positions of the two polishing discs, the two polishing discs are alternately polished, the wear of the polishing discs is reduced, the stability of the polishing quality is ensured, and the product quality is improved. The two polishing discs are alternately washed, the polishing discs are cleaned and cooled, and the service life of the polishing discs is prolonged.

This invention discloses a multi-scale feature fusion method and system for atmospheric turbulence video correction. It extracts shallow texture, mid-level structure, and high-level semantic information through a multi-scale feature pyramid, and combines frequency adaptive enhancement and deformable attention alignment mechanisms to perform channel-weighted processing on different frequency components. Adaptive optimization is achieved to address differences in turbulence sensitivity, and feature-level alignment is completed under optical flow guidance to eliminate tilt distortion. Simultaneously, a gated reference update module dynamically maintains reference features to suppress turbulence noise accumulation. Furthermore, a multi-head temporal channel self-attention mechanism is used to achieve cross-frame spatiotemporal fusion, improving temporal consistency, and a two-stage decoder is used to progressively restore image geometry and high-frequency details. This invention can significantly improve the clarity of turbulence-degraded images, providing technical support for high-precision imaging.

The utility model discloses a system of removing chlorine ion in lean organic phase in the system of crude phosphoric acid organic extraction production potassium dihydrogen phosphate, which comprises: a back extraction tank for reacting hydrochloric acid organic phase with ammonia water to generate ammonium chloride and separating phases; an aging tank connected to the outlet of the back extraction tank for static separation and phase separation to precipitate a chlorine-containing water phase; a multi-stage countercurrent water washing tank comprising at least three series-connected water washing tanks for washing the organic phase step by step; and an adsorption tower connected to the outlet of the last-stage water washing tank and provided with an adsorbent for further removing chlorine ions in the organic phase. The utility model fully utilizes washing water, reduces water consumption, realizes a chlorine ion removal rate of 94% to 96% in the lean organic phase, improves the purity of potassium dihydrogen phosphate products, prolongs the service life of the extraction agent, and systematically solves the industry problem that it is difficult to remove alkyl halides in the lean organic phase.

The invention provides a hovercar energy and heat management coupling system strategy generation method. The method comprises the steps that S101, modeling is conducted on a fuel cell subsystem, a lithium battery subsystem, a fuel cell hydrogen compressor and a cooling subsystem of a hydrogen fuel hybrid power hovercar; s102, establishing a hydrogen fuel hovercar energy and thermal management system coupling model based on the models of the fuel cell subsystem, the lithium battery subsystem, the fuel cell hydrogen compressor and the cooling subsystem; and S103, solving the hydrogen fuel hovercar energy and thermal management system coupling model by using a PPO algorithm. According to the invention, by coupling the energy and the thermal management system, the operation parameters of the hydrogen fuel cell can be dynamically adjusted to adapt to real-time environmental change and operation requirements, the energy utilization efficiency is improved, and the service life of the system is prolonged by optimizing the heat loss and heat dissipation process.

The invention provides a surface passivation treatment method for optimizing a tunneling oxidation passivation battery, which comprises the following steps of: in a BOE cleaning step, putting an annealed silicon wafer into a mixed solution of groove type cleaning equipment, cleaning the silicon wafer in the mixed solution for more than 120 seconds, taking out the silicon wafer, cleaning the silicon wafer with sufficient DIW, putting the silicon wafer into an acid solution, and cleaning the silicon wafer in the acid solution for more than 120 seconds; the silicon wafer is taken out and completely cleaned with a large amount of DIW, bubbling is carried out in the cleaning process, and finally, the surface of the silicon wafer is passivated with a (NH4) 2S solution; and dividing the antireflection film into three layers for preparation in the antireflection film manufacturing step. According to the invention, the P-type emitter of the battery is passivated by sulfur, and aluminum oxide is assisted to accumulate negative charges to enhance the field passivation effect; a dangling bond is passivated on the surface of the silicon, and reduction of a process window caused by hydrogen passivation accumulation [H] sources in the preparation process of the silicon nitride is liberated; and performance degradation caused by dissipation of [H] in long-term use of the battery assembly is reduced.

A kind of head elbow mechanism, including first mounting seat, rotating platform, swing seat, heating cylinder, first mobile seat, second mobile seat, elbow seat, elbow assembly, pipe clamp assembly, pipe cutting assembly, first drive part, second drive part, third drive part, fourth drive part and cooling assembly;Rotating platform is installed in first mounting seat, swing seat is installed in the output end of rotating platform, and third drive part is used to drive swing seat swing by rotating platform;First mobile seat can be left and right movable installation in swing seat, second mobile seat can be forward and backward movable installation in first mobile seat, elbow seat is installed in second mobile seat, elbow assembly can swing installation in elbow seat, and fourth drive part is used to drive elbow assembly swing.The utility model discloses a kind of head elbow mechanism according to above-mentioned content, solve the problem that existing technology in elbow equipment cannot be adapted to different pipe diameter pipe material processing, only single plane can be realized in elbow processing, and the problems of low processing efficiency and unstable forming quality.

The present invention relates to a battery module thermal runaway protection device, comprising a liquid cooling plate and a plurality of heat-conducting sleeves; the heat-conducting sleeve comprises an upper tube portion and a lower tube portion, the upper tube portion of the heat-conducting sleeve is used to be sleeved on the middle and upper part of the battery, and the inner side of the upper tube portion is in contact with the surface of the battery, the size of the area surrounded by the lower tube portion is larger than the size of the area surrounded by the upper tube portion, and there is a gap between the inner side of the lower tube portion and the surface of the battery. The above-mentioned battery module thermal runaway protection device uses a heat-conducting sleeve, sleeves the upper tube portion of the heat-conducting sleeve on the battery, and connects the lower tube portion of the heat-conducting sleeve to the liquid cooling plate, so that the heat generated by the upper part of the battery can be transferred to the liquid cooling plate along with the heat-conducting sleeve, thereby enhancing the thermal conductivity from the battery to the liquid cooling plate, and can reduce the maximum temperature of the upper part of the battery, reduce the temperature difference between the upper and lower parts of the battery, improve temperature uniformity, and slow down battery performance degradation.

The invention discloses an electro-catalytic hydrogen evolution catalyst and a preparation method and application thereof, and relates to the technical field of electro-catalysis, the electro-catalytic hydrogen evolution catalyst is composed of a silylene carrier subjected to defect engineering treatment and monatomic metal loaded on a defect site of the silylene carrier; according to the invention, defects are introduced into the carrier to preferentially load monatomic metal, and the monatomic metal and the carrier cooperate to increase active sites and improve the utilization rate of atoms; by means of the combination, monatomic metal loading can be more stable and uniform, agglomeration is reduced, the adsorption and desorption capacity on reactants can be enhanced, and the catalytic performance is improved. The combination of non-existing technologies such as a laser-induced plasma auxiliary technology and a biological template-quantum dot guide technology is realized, and the bottleneck that the activity and stability of a traditional catalyst are insufficient can be broken through.

The utility model discloses a fixed connecting piece for photovoltaic panel installation, which relates to the technical field of photovoltaic panel installation and comprises two installation plates, one side of one installation plate is provided with an insertion groove, one side of the other installation plate is provided with an insertion plate, the front end and the rear end of one installation plate are both provided with a plurality of holes, and the holes are communicated with the insertion groove. A knob bolt used for fixing the insertion plate is arranged at the front end of the opening, second anti-skid plates are arranged at the upper ends of the two mounting plates, sliding rails are arranged on one sides of the two mounting plates, two sliding blocks are symmetrically arranged on the outer surfaces of the sliding rails, L-shaped limiting plates are arranged at the upper ends of the sliding blocks, and right-angle connecting pieces are arranged on one sides of the L-shaped limiting plates. The fixed connecting piece for installing the photovoltaic panel can flexibly adjust the distance between the installing plates to adapt to different photovoltaic panels, is convenient and stable to install, and can also prevent the panel surface from being damaged; the multiple groups of photovoltaic panels are simple to assemble, stable in connection, large in spacing after installation and beneficial to heat dissipation, the service life of the photovoltaic panels can be prolonged, and the performance of a power generation system is improved.

The invention provides a lithium ion battery positive electrode doping screening method and device, and the method comprises the steps: firstly, determining an experiment effective doping element and a positive electrode material, and screening to-be-selected elements according to a preset index; then, constructing an LNMO initial model of the positive electrode material, and generating a plurality of first doping models in combination with the to-be-selected elements; then, a second doping model is screened out by calculating the voltage and the volume strain ratio of the battery; then, the doping concentration and the capacity retention ratio are evaluated, and a third doping model is further screened out; and finally, comprehensively considering the synthesis difficulty and the preparation cost of the doping material, and finally determining a target doping model. According to the method and the device, a plurality of key factors including voltage, strain, concentration, capacity, cost and the like can be comprehensively considered, and the optimal doping scheme is efficiently screened out, so that the energy density and the structural stability of the lithium ion battery positive electrode material are improved, and the requirement of a high-performance battery is met.

The invention discloses a preparation method of a photocatalyst material, and belongs to the technical field of material preparation and pollution treatment. The method comprises the following steps: by taking bismuth citrate as a multifunctional precursor, firstly mixing the bismuth citrate with a titanium source, a manganese source and a cerium source in a solvent for gelation, then carrying out solvothermal reaction to form an intermediate, and finally carrying out programmed temperature control pyrolysis in an inert and oxygen-containing atmosphere. In the pyrolysis process, carbon element doping and manganese and cerium bimetal ion lattice embedding are synchronously realized, and a graded porous folded structure is constructed in situ by utilizing precursor decomposition gas. The method integrally solves the problems of weak visible light response, low mass transfer efficiency and poor stability of a traditional material, and the prepared material shows efficient inhibition and degradation efficiency on mold such as aspergillus flavus under simulated granary low-illumination visible light.