54 results about "Charge transfer efficiency" patented technology

This disclosure provides a charge pump circuit. The charge pump circuit according to this disclosure includes one or more cascaded boost units and output units having the same structure. Each boost unit has a dual-branch structure with top and bottom symmetry and connected to two sets of four-phase clock signals with opposite clock phases. By adjusting the phase relationship of the four-phase clocks, the rise time of the gate voltage of the transfer transistor can be delayed by advancing the falling edge of the driving clock of the secondary capacitor and delaying its rising edge. This ensures that the transfer transistor is in the off state at the moment of high-low phase switching, thereby avoiding the problem of reduced charge transfer efficiency caused by reverse charge flow between the input and output nodes of the boost unit.

The utility model relates to lead -acid battery technical field, concretely is a kind of lead -acid battery current collector structure, including frame, recess is opened in the frame, the recess is equipped with porous carbon framework, the porous carbon framework is equipped on battery current collector main body, the battery current collector main body is attached with a layer of carbon cloth, the battery current collector main body is by surface body, aperture plate and grid three parts are composed, the grid is attached with one side graphene coating layer. The recess in the lead -acid battery current collector frame of the device is equipped with one side porous carbon framework, can increase the utilization of active material, improve the charge transfer efficiency of battery, the surface body of battery current collector main body is equipped with graphene coating layer, can significantly reduce the corrosion of surface body, improve the conductivity and current density of battery, the lead -acid battery current collector surface layer is equipped with a layer of carbon cloth, wherein carbon cloth and lead -acid battery current collector cooperate and have the charge-discharge performance and cycle life of the improvement of lead -acid battery.

The application discloses a graphene quantum dot / indium sulfide electromagnetic wave absorbing material and a preparation method thereof, and comprises the following steps: carrying out a hydrothermal reduction reaction on trinitro-pyrene and an alkaline solution to obtain graphene quantum dot powder rich in hydroxyl functional groups on the surface; and carrying out a hydrothermal reaction on a mixture of indium chloride tetrahydrate and thioacetamide and the graphene quantum dot powder to obtain a graphene quantum dot / indium sulfide heterojunction electromagnetic wave absorbing material with a sulfur vacancy concentration of 3.8% to 5.7%. The addition amount of the sulfur source is controlled by regulating the addition amount of the thioacetamide in the hydrothermal reaction process, the introduced sulfur vacancy concentration is accurately controlled, the In-O covalent bond is formed at the interface between the graphene quantum dot and the indium sulfide, the interface covalent bridging structure is formed, the interface charge transfer efficiency is accelerated, the built-in electric field in the interface is enhanced, stronger interface polarization loss is induced, and the performance of high absorption intensity and wide bandwidth of the composite wave absorbing material is realized.

The invention relates to the technical field of supercapacitor preparation, in particular to a (NiCo) Se2 / CoFe2Se4 composite electrode, a preparation method and application, and the method comprises the steps: preparing a NiCo precursor solution through Ni salt, Co salt and urea, growing NiCo precursor nanorods on a titanium mesh, and constructing a three-dimensional conductive skeleton; then preparing a Co-FePBA suspension by using Co salt, sodium citrate and K3 [Fe (CN) 6]; the titanium mesh loaded with the NiCo precursor nanorod is soaked in Co-FePBA suspension and aged at the constant temperature, a double-active-component precursor is formed, effective interface chemical bonding is formed, and the charge transfer efficiency can be effectively improved; finally, a (NiCo) Se2 / CoFe2Se4 heterojunction is generated through gas-phase selenylation, charges are redistributed at a heterogeneous interface, a built-in electric field is formed, and electron transfer and ion adsorption are accelerated; according to the method, the reaction kinetics of collaborative optimization of the (NiCo) Se2 and the CoFe2Se4 is realized, the process is simple, convenient, environment-friendly and economical, a feasible scheme is provided for large-scale production, and the problems of compounding of the (NiCo) Se2 and the CoFe2Se4, high charge transfer resistance and poor charge and discharge efficiency in the prior art are solved.

The invention discloses an MIL-68 metal organic framework / III-nitride nanorod array photo-anode as well as a preparation method and application of the MIL-68 metal organic framework / III-nitride nanorod array photo-anode. The photo-anode comprises a Si substrate, an InN or / and GaN nano-pillar array grown on the Si substrate, and an MIL-68 (In / Ga) metal organic framework layer grown on the surface of the nano-pillar array in situ, wherein the MIL-68 (In / Ga) metal organic framework layer is of a three-dimensional columnar structure. According to the invention, the MIL-68 (In / Ga) metal organic framework is introduced to the surface of the III-nitride nanopillar array, so that the self-driven assembly of an interface is realized, and the interface bonding strength and charge transfer efficiency of the photoelectrode are remarkably enhanced. The photoanode shows excellent stability and high efficiency in the photoelectrochemical water decomposition and organic pollutant degradation process, and has wide application prospects in new energy conversion and environmental governance.

The invention discloses a FeOOH / BiVO4 composite photo-anode, a temperature synergistic activation method for optimizing the performance of the FeOOH / BiVO4 composite photo-anode and application of the FeOOH / BiVO4 composite photo-anode, and belongs to the technical field of photoelectric catalytic materials and new energy. The FeOOH / BiVO4 composite photo-anode is formed by loading a cocatalyst layer FeOOH on the surface of a BiVO4 nano-structure substrate. The core of the invention lies in finding that the specific composite photo-anode system has a unique temperature-activity synergistic effect at an electrolyte temperature of about 40 DEG C. At the temperature, the FeOOH cocatalyst and the BiVO4 substrate not only exert respective catalytic advantages, but also realize maximization of interface charge transfer efficiency and remarkable acceleration of reaction kinetics through temperature field regulation and control, so that the photoelectrocatalytic water oxidation activity reaches a peak value, and the stability is far superior to that of a single BiVO4 photoanode. According to the method, a composite material system and the optimal working temperature of the composite material system are accurately matched, so that the cooperation of material design and working condition optimization is realized, and a new technical path and theoretical guidance are provided for developing efficient and stable composite photoelectric devices.

The application belongs to the technical field of photocatalytic hydrogen production, and particularly relates to a Z-type heterojunction Mn3O4@CdIn2S4 composite material and a preparation method and application thereof. The application synthesizes Mn3O4 microspheres by taking Mn-MOF as a precursor, in-situ grows a CdIn2S4 (CIS) shell, and prepares core-shell type Mn3O4@CdIn2S4 microspheres, and simultaneously forms a Z-type heterojunction. Compared with CdIn2S4 and Mn3O4, the photocatalytic performance of Mn3O4@CdIn2S4 under simulated sunlight is significantly improved. On one hand, the Z-type electron transfer path not only improves the electron-hole separation efficiency, but also improves the charge transfer efficiency. On the other hand, the existence of the core-shell heterojunction increases the light absorption range.

The invention discloses a method for optimizing the performance of a bismuth vanadate photo-anode by regulating and controlling the temperature of an electrolyte and application of the method, and belongs to the technical field of photoelectrochemical energy conversion. The method comprises the following steps: placing a bismuth vanadate photo-anode in an alkaline electrolyte, and controlling the temperature of the alkaline electrolyte to be 52-54 DEG C when a photoelectrocatalysis water decomposition reaction is carried out. According to the invention, the electrolyte is accurately controlled within the temperature range to carry out the photoelectrocatalytic water decomposition reaction, so that the photocurrent density, the photoelectric conversion efficiency (ABPE) and the charge transfer efficiency can be remarkably improved. According to the invention, the nonlinear influence rule of the electrolyte temperature on the charge transfer behavior of the BiVO4 / electrolyte interface is systematically disclosed for the first time, and the action mechanism is similar to that in a periodic structure, band gap optimization and energy transfer efficiency maximization are realized through parameter tuning. The method does not need to carry out complex modification on an electrode material, is simple to operate, low in cost and good in repeatability, and provides a new optimization strategy and application guidance for design and operation of a high-efficiency solar fuel conversion device.

The invention discloses conductive hydrogel as well as a preparation method and application thereof, and relates to the technical field of conductive hydrogel materials. The preparation method comprises the following steps: dispersing nanocellulose into a hydrophilic and hydrophobic monomer precursor solution, adding an amphiphilic monomer, inducing microphase separation by utilizing thermodynamic incompatibility, and carrying out thermal initiation polymerization. The hydrogel is internally provided with a micro-phase separation structure formed by self-assembly, and nanocellulose is distributed on a phase interface to form a continuous ion channel. Through microstructure regulation and control, the mechanical strength, toughness and ionic conductivity of the material are effectively coordinated, and meanwhile, the material is endowed with excellent water-retaining property and environmental stability. The preparation process is simple and does not need complex equipment. The conductive hydrogel is particularly suitable for being used as a negative electrode friction layer of a friction nano-generator, can remarkably improve the charge transfer efficiency and the device output performance, and has important application value in the fields of flexible electronics, intelligent sensing and the like.

This invention discloses a bootstrap charge pump structure, comprising: a clock control logic circuit, a bootstrap switch array, a boost capacitor, and an input voltage buffer. The clock control logic circuit is connected to the bootstrap switch array and is used to generate a four-phase non-overlapping clock to control the orderly activation of the switches in the bootstrap switch array. The bootstrap switch array is connected to the boost capacitor, and the clock control logic circuit boosts the voltage of the boost capacitor. The input voltage buffer is connected to the bootstrap switch array and is used to provide an adjustable voltage input to the bootstrap switch array. This invention improves the charge transfer efficiency of the charge pump and reduces resistance, representing an efficient bootstrap charge pump structure.

The invention relates to the technical field of lithium ion batteries, and particularly discloses a lithium iron phosphate material, a preparation method and application, the preparation method comprises the following steps: preparation of a precursor FePO4: dissolving an iron source, a phosphorus source and polyethylene glycol in deionized water, dropwise adding an oxidant in a reaction system, heating at a constant speed and stirring at a constant speed to obtain a precipitate, and drying the precipitate to obtain the precursor FePO4; washing, drying and calcining the precipitate to obtain a precursor FePO4; the preparation of the LiFePO4 material comprises the following steps: mixing the precursor FePO4 with excessive lithium source and carbon source, carrying out ball milling, drying, carrying out staged heating calcination in inert gas, and cooling to obtain the LiFePO4 material. Coprecipitation and a high-temperature carbonization process are combined, polyethylene glycol is introduced for anti-agglomeration modification in the process of preparing a precursor FePO4, overgrowth and hard agglomeration of precursor particles are effectively inhibited by increasing a steric hindrance effect, and meanwhile, regular crystallization is guided to form a microstructure beneficial to lithium ion diffusion; particle morphology and a uniform carbon pattern layer are accurately controlled, and charge transfer efficiency and lithium ion diffusion are improved.

The invention discloses a difunctional negative electrode electrolyte of an all-iron flow battery, a preparation method of the difunctional negative electrode electrolyte and application of the difunctional negative electrode electrolyte in the all-iron flow battery. The negative electrode electrolyte of the difunctional total iron flow battery is prepared by mixing an active substance containing Fe < 3 + > or Fe < 2 + > ions, a supporting electrolyte, a sulfur-nitrogen derivative additive and deionized water. According to the invention, the sulfur-nitrogen derivative is innovatively adopted as an additive in the negative electrode electrolyte, and the sulfur-nitrogen derivative and Fe < 3 + > / Fe < 2 + > form a stable complex, so that the deposition / dissolution behavior of iron ions can be effectively regulated and controlled, dendritic crystal growth can be inhibited, and hydrogen evolution side reaction can be reduced. Under the double effects, the charge transfer efficiency and the cycle stability of the battery are remarkably improved, and finally, the optimization of the overall performance is realized.

The invention discloses a nickel alloy coated copper skeleton catalytic electrode and a preparation method thereof. The method comprises the following steps: sequentially carrying out solution atomic layer deposition nucleation and autocatalytic amplification deposition treatment on a three-dimensional porous foamy copper substrate to obtain a deposition sample coated with a non-noble metal coating; carrying out annealing thermal diffusion treatment on the deposition sample to obtain an annealed sample; in the annealing process, copper atoms in the three-dimensional porous foamy copper substrate are diffused to the non-noble metal plating layer, so that the non-noble metal plating layer is converted into a solid solution transition layer, and the concentration of the copper atoms in the solid solution transition layer is gradually reduced from inside to outside; and sequentially carrying out chemical dealloying and electrochemical selective dealloying treatment on the annealed sample, and dissolving a copper enrichment site in the solid solution transition layer to form a through nanopore channel, so as to obtain the nickel alloy coated copper skeleton catalytic electrode. The structure obtained through the method is good in stability, high-density grain boundaries and oxygen vacancies can be exposed on the surface of the material, the charge transfer efficiency and the active site density are remarkably improved, and the catalytic performance is improved.

This application provides a CdIn2S4 / PMOF heterojunction photocatalyst, its preparation method, and its application, belonging to the field of photocatalysts. The method involves dissolving a cadmium source, an indium source, and a surfactant in an organic solvent and stirring until homogeneous to obtain a precursor solution. PMOF is then added to the precursor solution and dispersed uniformly. A sulfur source is then added, followed by a solvothermal reaction to obtain the CdIn2S4 / PMOF heterojunction photocatalyst. This application utilizes an in-situ solvothermal method to construct a two-dimensional CIS / PMOF heterojunction photocatalyst with coordinate bonds. The CIS and PMOF are connected via Cd-N... x Coordinate bond bonding, using Cd-N x Coordination bonds enhance interfacial interactions and synergistically regulate band structure and charge transfer efficiency, fundamentally solving the core defects of low carrier separation efficiency in single catalysts and weak interfacial interactions in composite catalysts; the synergistic catalytic effect of CIS and PMOF enables the directional conversion of HMF to FFCA, increasing the added value of the product.

The invention discloses a high-speed large-size pixel unit capable of improving charge transfer efficiency and an image sensor. The high-speed large-size pixel unit is a PPD-TG-FD pixel unit based on double PPDs and double transmission gates, and comprises two symmetrically distributed half-gear-shaped PPDs forming an N region, a complementary tooth-shaped P region matched with the half-gear-shaped PPDs, and an FD located at a pixel center position between the two half-gear-shaped PPDs; a first transmission gate TG1 and a second transmission gate TG2 are arranged between the FD and each half-gear-shaped PPD in a spaced mode, the two first transmission gates TG1 and the two second transmission gates TG2 are symmetrically arranged, the second transmission gates TG2 are arranged close to the half-gear-shaped PPD, and the first transmission gates TG1 are arranged close to the FD. Through the special design of the PPD shape, the doping process and the transmission gate, the charge transfer efficiency of large-size pixels is improved, so that the photoelectric charge detection and collection efficiency of ultrahigh frame rate imaging is improved.

The invention relates to the technical field of lithium ion batteries, in particular to a bipolar covalent organic framework and carbon nanotube composite material as well as a preparation method and application thereof. According to the bipolar organic covalent framework electrode, N, N, N ', N'-tetraphenylene-1, 4-phenylenediamine and phephthaldehydrate serve as construction units, in-situ growth is carried out on a carbon nano tube, and TATP-COF (at) CNT is synthesized through a solvothermal method. According to the method, n-type and p-type redox active sites are simultaneously integrated in a bipolar COF, and the obtained organic positive electrode effectively stores positive ions and negative ions during charging and discharging, so that the inherent advantages of two molecular types, including high capacity and high voltage of the battery, are utilized; and in-situ growth is carried out on the CNT, so that the accessibility of active sites and the charge transfer efficiency are ensured.

The invention discloses a perovskite solar cell based on a niobium carbide doped self-assembly monomolecular layer hole transport layer and a preparation method of the perovskite solar cell, and belongs to the technical field of solar cells. The solar cell comprises a cathode substrate, a hole transport layer, a perovskite light absorption layer, an electron transport layer and an anode electrode. The hole transport layer of the solar cell disclosed by the invention is formed by doping and mixing niobium carbide (NbCTx and Nb3CTx) with a self-assembled monomolecular layer (such as MeO-4PACz). By introducing niobium carbide with high work function, high conductivity and environmental stability into the ultrathin SAMs layer, the energy level matching between the hole transport layer and the perovskite layer is effectively improved, the hole extraction efficiency is enhanced, the interface recombination is reduced, and the open-circuit voltage, short-circuit current and charge transfer efficiency of the device are remarkably improved.

A pixel structure and a method of forming the same are provided. The pixel structure includes a semiconductor substrate, a trench isolation, a semiconductor layer and a doped region. The trench isolation is disposed in the semiconductor substrate. The semiconductor layer is disposed in the semiconductor substrate and surrounded by the trench isolation. The semiconductor layer has a first conductive type and a photodiode is formed in the semiconductor layer. The doped region is disposed between the trench isolation and the semiconductor layer and has a second conductive type opposite to the first conductive type. The doped region extends between a first surface and a second surface opposite to the first surface of the semiconductor substrate, and a width of the doped region decreases as the doped region becomes closer to the first surface. The pixel structure may optimize full well capacity and charge transfer efficiency.

The application provides a DCBQ-doped PEDOT:PSS / PSII photoanode and a preparation method thereof; the method comprises the following steps: extracting PSII protein complexes from spinach and preparing PSII solution with a determined chlorophyll concentration, preparing a PEDOT:PSS / DCBQ composite solution with a specific concentration ratio, and alternately coating the composite solution and the PSII solution on an ITO substrate, and drying in a low-temperature dark nitrogen atmosphere, so as to obtain a composite photoanode with 3-4 functional layers through cyclic layer-by-layer assembly. The application constructs an efficient electron transport interface through PEDOT:PSS / DCBQ, realizes the synergistic regulation of the PSII system electron transport process, reduces the energy transfer loss, and improves the charge transfer efficiency. In addition, the DCBQ-doped PEDOT:PSS conductive network is used for layer-by-layer assembly, the PSII load is improved, the electron transfer is accelerated, and therefore the photocurrent response of the system is significantly improved.

The invention discloses a NiMoO4 (at) Co (CO3) 0.5 (OH) composite material, and belongs to the field of supercapacitors. In order to solve the problems of low charge transfer efficiency and low utilization rate of active sites of NiMoO4, the NiMoO4-Co (CO3) 0.5 (OH) composite material with uniform distribution and stable structure is obtained on foamed nickel through a secondary hydrothermal method. The composite material with the micro-sphere and nano needle-shaped heterostructure not only has relatively high specific capacitance, but also has good stability.

The invention relates to the technical field of nano composite materials, in particular to a carbon-based tannic acid-Fe composite aerogel with good power generation performance and a preparation method and application thereof. According to the aerogel, through the design of a single-oriented structure and the modification of a tannic acid-Fe coating on the surface, the water transmission capacity and the interface charge migration efficiency in the material are effectively enhanced. In a 3D working mode, the material shows excellent electric output performance, and the power density of the material can reach 48.92 under a sun illumination condition and is remarkably improved compared with that of unmodified carbon-based aerogel.

The invention belongs to the application field of hydrogen production through photoelectrochemical water decomposition, and particularly relates to a metal-porphyrin polymer / bismuth vanadate composite photo-anode and a preparation method and application thereof. According to the preparation method disclosed by the invention, the poly transition metal-5, 10, 15, 20-tetra (tetra-diphenyl aminophenyl) porphyrin catalyst is successfully polymerized on the surface of BiVO4 in situ for the first time through an electric polymerization method, so that a molecular polymer anchored by transition metal is successfully catalyzed and uniformly dispersed on the BiVO4 composite photo-anode, and the water oxidation kinetics and photo-generated charge transfer efficiency of BiVO4 are remarkably improved; the performance of photoelectrocatalysis is promoted, and good stability is presented.

The application discloses a kind of Ni 11 (HPO3)8(OH)6 / Mo8O 23 / foam nickel bifunctional composite electrode and preparation method thereof, utilize simple one-step hydrothermal reaction, in-situ growth Ni 11 (HPO3)8(OH)6 nanosheet and Mo8O 23 Nanosheet assembly of multistage structure composite microspheres, construct self-supporting composite electrode, in-situ growth on the surface of metal foam nickel, give catalyst more exposed active site and more interface transfer active site, beneficial to the diffusion of electrolyte, proton multi-site adsorption and the rapid escape of generated H2.In addition, the construction of self-supporting electrode greatly improves the charge transfer efficiency, effectively avoids the falling of catalyst, increases the stability of electrode.The composite electrode preparation process is simple, low in cost.It is used for electrocatalytic decomposition of water to produce hydrogen, electrocatalytic biomass oxidation to prepare high value-added fine chemicals, electrocatalytic urea oxidation, electrocatalytic degradation of organic dyes, organic chemical wastewater treatment, etc., all show excellent electrocatalytic activity and stability.

This disclosure provides a charge pump circuit. The charge pump circuit for boosting positive voltage according to this disclosure includes one or more cascaded boost units and output units having the same structure. Each boost unit has a dual-branch structure with symmetrical upper and lower branches but reversed clock phases. By transmitting the high level stored in the secondary capacitor or the low level output from the previous stage to the gate of the current stage's transfer transistor to control its full conduction or complete turn-off, the problems of gate voltage drop and threshold voltage loss of the transfer transistor caused by charging from the previous stage node to the subsequent stage node in existing charge pump circuit structures are avoided. This effectively improves the charge transfer efficiency and boost capability of the charge pump circuit, reduces the operating power consumption of the charge pump circuit, and makes it suitable for lower power supply voltages. By reversing the charge pump circuit for boosting positive voltage according to this disclosure, a charge pump circuit for stepping down ground voltage or negative voltage can also be provided.

The invention relates to the technical field of energy storage battery management, and discloses a lithium iron phosphate 1C energy storage battery state monitoring and management method. According to the method, an electrical sensor array is used for comprehensively collecting multi-dimensional real-time parameters such as pole piece voltage gradient, electrolyte impedance spectrum and monomer temperature field distribution of the energy storage battery pack, and the parameters can comprehensively reflect the running state of the battery. And carrying out time domain segmentation on the parameters by adopting a self-adaptive sliding window to generate a battery state data block with a timestamp. And inputting the data blocks into a parallel processing channel, and respectively executing polarization voltage compensation calculation, thermodynamic coupling analysis and charge transfer efficiency evaluation. And correcting electrolyte impedance spectroscopy measurement deviation according to a polarization voltage compensation result, constructing a three-dimensional state matrix in combination with thermodynamic coupling analysis, and dynamically weighting the three-dimensional state matrix according to charge transfer efficiency evaluation to generate a battery health degree feature vector. And identifying the feature vector pattern by using a deep sequential network, and outputting a battery degradation stage mark and a residual capacity prediction value.

The utility model discloses a perovskite solar cell, which comprises a substrate, and a first charge transport layer, a perovskite absorption layer, a second charge transport layer and a first electrode which are stacked on one side of the substrate along a first direction, and is characterized in that the first charge transport layer comprises a first film layer, a first modification layer and a second modification layer which are stacked along the first direction; the first film layer is located on the side, close to the substrate, of the first modification layer, the first film layer, the first modification layer and the second modification layer are each of a first type, the first type is P type or N type, and the first direction is the direction, pointing to the first electrode, of the substrate; the problem that the charge transfer efficiency of a battery is affected due to poor interface wettability of a charge transfer layer in the prior art is solved.

The invention relates to the technical field of micro-nano sensing devices and composite materials, and discloses a wearable flexible sensing and self-powered integrated device and a preparation method and application thereof, and the device comprises a ZnO / PVDF composite piezoelectric film based on an electrostatic spinning technology and a ZnO charge transport layer film based on a magnetron sputtering technology. An organic piezoelectric polymer PVDF and inorganic nano zinc oxide are mixed through an electrostatic spinning technology to overcome the defect of a single material, the piezoelectric property of the composite fiber membrane material is further enhanced by adding zinc oxide nano particles, and a ZnO film deposited through magnetron sputtering serves as a charge transport layer. Therefore, the interface contact resistance is reduced, the charge transfer efficiency is improved, the influence problems that the output performance of a traditional piezoelectric sensor is limited, secondary polarization is needed and the like are solved to the maximum extent, and adaptive sensing application can be flexibly customized according to diversified wearable requirements.

The invention discloses a nickel-cobalt hydrotalcite / basic cobalt carbonate composite photocatalyst, a preparation method thereof and application of the nickel-cobalt hydrotalcite / basic cobalt carbonate composite photocatalyst in light-assisted uranium extraction, and belongs to the technical field of photocatalysts. According to the catalyst, cobalt salt and nickel salt serve as precursors, urea serves as a precipitator, and the sea-urchin-shaped nickel-cobalt hydrotalcite / basic cobalt carbonate composite photocatalyst can be prepared by regulating and controlling the nickel-cobalt ratio and the hydrothermal reaction heating rate. The specific surface area of the composite photocatalyst is larger than 125m < 2 > / g and is obviously superior to that of pure-phase basic cobalt carbonate and nickel hydroxide, and the composite photocatalyst has obvious advantages in the adsorption process of target pollutants. More importantly, the sea urchin-shaped structure endows the composite photocatalyst with a larger interface contact area, so that the compounding of photo-induced electrons and holes can be obviously inhibited, the charge transfer efficiency is optimized, and the photocatalytic performance is improved. The preparation method disclosed by the invention is simple, short in time consumption and high in repeatability, can be used as a photocatalyst to be applied to enrichment of low-concentration uranium-containing wastewater, and has a relatively high application value.