432 results about "Charge separation" patented technology

The present invention discloses a CMO / SO / BVO photoanode and a preparation method and application thereof, and relates to the field of photoelectrochemical technology. The method comprises the following steps in sequence: electrodepositing a BiOI film on a substrate material, and then dripping a dimethyl sulfoxide solution containing vanadium acetylacetonate to obtain a BVO electrode; placing in a NaOH solution containing tetraethyl orthosilicate to obtain a SO / BVO electrode; placing in a CoMoO4 precursor solution, hydrothermally reacting, calcining, and obtaining a CMO / SO / BVO photoanode. The CMO / SO / BVO of the present invention exhibits superior photocurrent and charge separation efficiency compared to the CMO / BVO photoanode under 1.23V vs.RHE conditions. The present invention solves the problem of poor photoelectrochemical performance of the photoanode in the prior art.

The invention discloses a novel photocatalyst for producing hydrogen from organic matter wastewater and a preparation method of the novel photocatalyst, and relates to the technical field of photocatalysis. The photocatalyst disclosed by the invention is combined with oxidation-reduction capability, and can effectively degrade and produce hydrogen under the irradiation of sunlight. Through combination of quaternized porous tungsten oxide and vanadate radicals, silver vanadate load growth is promoted, the sunlight utilization rate is increased, and the electron-hole recombination rate is reduced. Reduced graphene oxide is used for pretreatment, active groups are introduced, the reduced graphene oxide is compounded with tungsten oxide / silver vanadate, the binding force is enhanced through heat treatment, photo-induced electron-hole pair compounding is inhibited through the conductivity, and the visible light catalytic performance is improved. The adsorption effect of porous tungsten trioxide and reduced graphene oxide can accelerate the degradation of organic matters. By optimizing the proportion of silver vanadate, tungsten oxide and reduced graphene oxide, the visible light response and charge separation efficiency are enhanced, the degradation and hydrogen production performance is improved, and light corrosion is reduced.

The invention relates to the technical field of composite catalyst materials, in particular to a ferrocobalt bimetal hydroxide / BCN composite material and a preparation method and application thereof.The preparation method comprises the steps that cobalt nitrate and ferric nitrate are used for preparing a metal salt solution, sodium carbonate and sodium hydroxide are used for preparing a precipitant solution, a B-doped carbon nitride BCN material is added into the metal salt solution to form a uniform suspension, and the suspension is dried to obtain the ferrocobalt bimetal hydroxide / BCN composite material; dropwise adding the precipitant solution into the suspension to obtain a precursor solution, performing hydrothermal reaction on the precursor solution, and performing centrifugal impurity removal and drying to construct a heterostructure between layered double hydroxide and BCN in situ to obtain the Co-Fe LDH-coated BCN composite material. Through boron doping and heterostructure construction, the charge separation capacity of graphite carbon nitride is enhanced, the electron migration efficiency is improved through a heterointerface structure, the metal ion release amount and the cycle stability are controlled, and the catalytic performance is remarkably improved.

The invention provides a Cu2O-based heterogeneous composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: coating the surface of a Cu2O hollow sphere substrate with a carbon layer, and depositing layered double hydroxides (LDHs) and metal palladium (Pd) nanoparticles on the carbon layer. According to the material, through a Cu2O-carbon layer-LDHs-Pd multistage heterostructure design, space optimization of light absorption, charge transfer and catalytic sites is realized; cu2O-carbon layer-LDHs interface coupling promotes directed migration of photo-induced electron-hole pairs, and the surface plasmon resonance effect of Pd nanoparticles enhances the charge separation efficiency; the LDHs optimizes a charge transfer path through surface oxygen vacancy or metal valence cycle, so that synergistic oxidation of non-free radicals and free radicals is realized, the organic matter degradation efficiency is remarkably improved, the oxidation path is widened, and the performance bottleneck of a single material is broken through.

The invention belongs to the technical field of immunoassay and biosensing, and provides a novel construction mode of a heterojunction dual-photoelectrode photoelectric sensing strategy and a preparation method of an in-situ heterojunction MIO photocathode. The invention relates to a preparation method of a heterojunction dual-photoelectrode type photoelectrochemical sensor based on multi-ball cascade DNA reaction amplification. Specifically, the design is composed of an In2O3 / CdS photoanode and an in-situ formed MIL-68 / In2O3 (MIO) photocathode. The heterojunction dual-photoelectrode sensing strategy effectively prolongs an electron-hole transmission path, enhances photo-generated charge separation, and realizes' super-open 'PEC signal output, thereby providing a steady baseline for signal conversion. Meanwhile, a multi-sphere cascade DNA reaction is combined to output a three-dimensional DNA net structure to provide a large number of sites for embedding of a PEC quenching probe doxorubicin-ferrocene carboxylic acid (DOX-FcCOOH), obvious PEC signal quenching is realized by utilizing the efficient competitive electron transfer capability of the three-dimensional DNA net structure, and finally, a signal conversion system with'opening-super opening-closing 'multistage response characteristics is constructed. The detection of the nucleic acid marker Pax-5a gene of the B cell acute lymphatic leukemia is realized by detecting target objects with different concentrations.

The invention is suitable for the technical field of photocatalyst preparation, and provides a modified tubular g-C3N4 loaded Ni-CoP photocatalyst and a preparation method thereof. The preparation method comprises the following steps: calcining a carbon nitride precursor in stages to obtain tubular carbon nitride, stirring the tubular carbon nitride with a cobalt and nickel-containing compound and an alkaline compound, washing and drying to obtain a precipitate, calcining, mixing and grinding with a phosphorus-containing compound, calcining again, and modifying the product with polydopamine and polypyrrole to obtain the composite material. The photocatalyst modified by the polydopamine and the polypyrrole and loaded with the Ni-CoP by taking the tubular g-C3N4 as the carrier is obtained. According to the invention, three-in-one synergistic integration of'carrier-modifier-cocatalyst 'is realized, the prepared photocatalyst still keeps tubular morphology and has a larger specific surface area, the requirements of anode oxygen evolution reaction (OER) on rapid charge separation and transmission can be met, meanwhile, the light absorption range is widened, the solar energy utilization rate is increased, and a foundation is laid for efficient OER reaction.

The invention relates to an external field intelligent regulation and control photocatalytic hydrogen production integrated device and system. The device comprises a Fresnel lens; the double-layer vacuum glass tube comprises an outer-layer glass tube, an inner-layer glass tube and a vacuum layer located between the outer-layer glass tube and the inner-layer glass tube, and the inner-layer glass tube is connected with an external water source and the separation module; the Helmholtz coil comprises two conductor coils, and the two conductor coils are symmetrically arranged at the two ends of the outer-layer glass tube in a sleeving mode and are communicated with an external power source; the photocatalyst is arranged in the inner-layer glass tube and is positioned at a strip-shaped light band of the sunlight focused by the Fresnel lens; the separation module comprises a hydrogen separation membrane and a gas outlet and is used for efficiently separating gas generated by reaction; the Fresnel lens is connected with the double-layer vacuum glass tube through the fixing support and located on the upper side of the double-layer vacuum glass tube. The Helmholtz coil is used for generating a magnetic field to improve the photo-generated charge separation efficiency in the photocatalytic reaction process, so that the hydrogen production efficiency is improved. The efficiency of photocatalytic reaction hydrogen production can be improved through precise regulation and control of an external field.

The invention discloses a hole transport material, a preparation method thereof and a perovskite solar cell, and belongs to the technical field of photovoltaic solar materials. The molecular structural formula of the compound is shown as a formula (I) or a formula (II). According to the invention, a quinoxaline part is used as an electron acceptor for extended conjugate modification, a plurality of single donors such as triphenylamine electron donating groups, dihydroacenaphthene, binaphthyloxy and the like are introduced, the hole transport material with a multi-donor structure is constructed, and the hole transport material adjusts the distribution of HOMO-LUMO, increases charge transfer channels, improves the separation and transport capabilities of charges, and improves the hole transport efficiency. Therefore, the mobility of current carriers is improved. A tert-butyl unit is further introduced to the periphery of the triphenylamine group, the hydrophobic property of tert-butyl reduces the interface energy barrier between the hole transport layer and the perovskite precursor solution, directional growth and defect passivation of perovskite crystals are promoted, and the crystallization quality of the perovskite thin film and the device performance are improved.

The invention discloses a barium ion single-doped / double-doped brookite titanium dioxide nanorod catalyst as well as preparation and application, the catalyst synthesized by a thermal decomposition method comprises brookite phase titanium dioxide and doped barium ions, and the nanorod-shaped catalyst containing oxygen vacancy defects has the width of 4-6 nanometers and the length of 20-50 nanometers. The piezoelectric property of brookite titanium dioxide is induced through doping of barium ions, charge separation is promoted through a built-in electric field, meanwhile, oxygen vacancies are induced through a charge compensation mechanism, the piezoelectric catalysis and photocatalytic efficiency is promoted, and the problems mentioned in the background technology are solved.

The invention discloses a current collector composite copper foil film spreading method and device, and the method comprises the steps: applying a DC electric field to a current collector composite copper foil, forming an interface charge separation layer, obtaining reference capacitance distribution data, applying a film spreading tension to enable the material layers to generate microscopic displacement, and obtaining capacitance change data. The method comprises the following steps: analyzing and identifying an abnormal adhesion area through time domain difference and sliding window correlation, applying periodic micro-stress disturbance to the abnormal area to establish a stress-capacitance response relation to invert adhesion strength spatial distribution, and periodically recording a capacitance reference value to evaluate the interface adhesion fatigue degree. The device comprises an electric field processing module, a film spreading tension module, a correlation analysis module, a stress disturbance module and a fatigue evaluation module. According to the scheme, real-time dynamic detection and quantitative evaluation of the interlayer adhesion strength in the current collector composite copper foil film spreading process can be realized, the interface adhesion failure and fatigue accumulation state can be effectively identified, and accurate technical support is provided for battery current collector preparation process optimization and product quality control.

The invention relates to the technical field of electroluminescence, and discloses a laminated organic light-emitting device and application thereof, and the laminated organic light-emitting device comprises an anode layer, a first light-emitting unit, an electron transport layer, an interface modification layer, a connection layer, a second light-emitting unit and a cathode layer which are sequentially arranged from bottom to top; the electron transport layer comprises a hole blocking layer and an n-type electron transport layer; wherein the n-type electron transport layer is composed of an n-type dopant and an organic electron transport material, has the functions of electron transport, charge separation and injection and regulation and control of the optical microcavity effect of the laminated device, can simplify the electron transport and connection layer structure of the laminated device, and effectively improves the conductivity of the laminated device; according to the laminated organic light-emitting device, the voltage drop of the body is obviously reduced, and the interface electron injection barrier is reduced, so that the laminated organic light-emitting device has the advantages of low driving voltage, high efficiency and long service life, and the effect of adjusting the optical microcavity of the device can be achieved by utilizing the n-type electron transport layer.

The invention provides a double-defect-modified porous carbon nitride photocatalyst prepared by one step from ferromolybdic acid as well as a preparation method and application of the double-defect-modified porous carbon nitride photocatalyst. The catalyst is of a thin-layer porous structure, so that the specific surface area of the catalyst is increased, and more surface active sites are provided for adsorption and reaction; compared with pure g-C3N4, the visible light absorption intensity of the catalyst is obviously enhanced, due to the existence of surface N vacancies and defects formed by doping of metal oxides, effective charge separation is enhanced, the photon-generated carrier separation and transfer capacity is higher under visible light irradiation, and the catalytic activity is remarkably improved. When the photocatalyst is applied to degradation of tetracycline antibiotic pollutants, photocatalytic degradation of tetracycline can be realized only under the condition of low-power 5W LED visible light, the preparation process is simple, and the cost is lower.

The invention discloses a porous organic polymer material, a preparation method of the porous organic polymer material and application of the porous organic polymer material in CO2 adsorption and photocatalytic preparation of H2O2, and belongs to the technical field of organic framework materials. The porous organic polymer material is prepared by the following method: adding a compound A and benzo [1, 2-B: 3, 4-B ': 5, 6-B'] trithiophene-2, 5, 8-trialdehyde into a solvent, and uniformly mixing; then adding a catalyst, and carrying out polymerization reaction under the condition of inert gas to obtain a polymerization reaction product; and washing and drying the reaction product to obtain the porous organic polymer material. The porous organic polymer material prepared by the invention is novel in structure, not only has excellent photoinduced charge separation and transmission efficiency, shows better advantages in the aspect of photocatalytic preparation of H2O2, but also has excellent CO2 adsorption performance, thereby having important value and significance for further expansion and application of organic framework materials.

Methods include introducing an ion quantity into an ion accumulation region, wherein the ion accumulation region, which can comprise a structure for lossless ion manipulations (SLIM) device allowing creation of a static or traveling wave electric field that moves ions towards an ion wall controllably blocking a movement of the ion quantity past the ion wall, wherein the ion wall is produced by one or more ion wall electrodes of an electrode arrangement, and directing the ion quantity in a direction towards the ion wall to increase a density of the ion quantity adjacent to the ion wall, such that the quantity of ions becomes space charge separated based on mobility along the direction and adjacent to the ion wall. Related apparatus provide space charge driven mobility separations.

The invention relates to preparation of a crystalline allyl covalent organic framework material and application research of the crystalline allyl covalent organic framework material in benzamide cyclization green photocatalytic conversion. The SF-COF material is prepared by adopting a step-by-step synthesis method. The preparation method comprises the following steps: synthesizing a COF precursor by taking 1, 3-benzenetricarboxaldehyde and p-aminophenylacetonitrile as raw materials, and preparing the allylation covalent organic framework material with the electronic push-pull effect from the COF precursor and 5, 5 ', 5'-(benzene-1, 3, 5-triyl) tri (thiophene-2-formaldehyde) through a solvothermal method. The material is applied to the field of photocatalytic organic conversion, and benzamide cyclization and conversion of derivatives of benzamide are achieved under irradiation of a blue light LED. The prepared SF-COF has the advantages of efficient charge separation and electron conduction performance, good structural stability and chemical stability and the like. And a catalyzed organic reaction substrate has the advantages of wide universality range, good cycle stability and the like, and shows excellent photocatalytic conversion capability.

The application discloses a preparation method and application of a ferroelectric full water-splitting photocatalyst. The preparation method comprises the following steps: S1: pretreating a ferroelectric material to obtain a pretreated ferroelectric material; S2: after atomic layer deposition of the pretreated ferroelectric material and a metal organic complex source material, non-active gas I is introduced to perform blowing I, water is introduced, non-active gas II is introduced again to perform blowing II, and the first deposition is completed; and S3: according to the thickness of the ferroelectric full water-splitting photocatalyst, the step S2 is circularly performed to obtain the ferroelectric full water-splitting photocatalyst. The ferroelectric material can efficiently photocatalyze full water splitting through accurate regulation and modification of the surface of the ferroelectric material by the atomic layer deposition technology. The method not only provides an experimental basis for researching the limiting factors of the ferroelectric material in a photocatalytic reaction, but also provides a new idea for constructing an efficient photocatalyst by using efficient charge separation and depolarization electric field of the ferroelectric material.

The present disclosure relates to the technical field of display, and provides a light-emitting device and a display panel. The light-emitting device comprises a first electrode, a second electrode, a plurality of light-emitting units arranged between the first electrode and the second electrode, and a charge separating generating unit arranged between adjacent light-emitting units, wherein a light-emitting center of the light-emitting unit is located at an antinode point of a resonance wave of a resonant microcavity formed between the first electrode and the second electrode.

The invention relates to a high-performance positively charged composite membrane and a preparation method thereof, in particular to a nanofiltration membrane containing a sulfonated imino covalent organic framework (TpPa-SO3H) interlayer. The nanofiltration membrane adopts a three-layer structure design, and comprises a base membrane layer, a TpPa-SO3H middle interlayer and a positively charged separation surface layer. Wherein the TpPa-SO3H interlayer is formed by in-situ growth of polyphenol and sulfated amine under the action of an oxidizing agent, and the separation surface layer is assembled and constructed through electrostatic attraction and hydrogen-bond interaction between positively charged polyelectrolyte and sulfonic acid groups. The TpPa-SO3H interlayer is introduced to effectively regulate and control the pore size distribution and hydrophilicity of the surface of the substrate, the formed negative electricity interlayer can promote the assembly of a polyelectrolyte positive electricity layer, and the interception performance and the operation stability of the composite membrane on heavy metal cations are remarkably improved. Compared with a traditional nanofiltration membrane, the composite membrane prepared through the method keeps high water flux (larger than or equal to 40 L.m <-2 >. H <-1 >. Bar <-1 >), meanwhile, the rejection rate of heavy metal cations such as Cr < 3 + >, Mn < 2 + > and Co < 2 + > is larger than or equal to 95%, and the composite membrane has excellent long-term operation stability. The preparation method is simple in process and low in cost, and has a wide application prospect in the field of heavy metal wastewater treatment.

The invention discloses a preparation method and application of a TiO2 / Ag-coated MoS2 composite photocatalyst, and relates to the technical field of catalysts.The method comprises the steps that titanium dioxide is evenly dispersed in an ethanol-water mixed solution to form turbid liquid; adding a silver nitrate solution and carrying out ultraviolet irradiation to carry out a photodeposition process; adding an ammonium tetrathiomolybdate precursor solution into the turbid liquid, carrying out ultraviolet irradiation, inducing MoS < 2-> to be subjected to an auto-oxidation reduction reaction through an electronic effect, generating an amorphous MoS2 shell on the surface of silver, and forming a core-shell Ag-coated MoS2 cocatalyst; and centrifuging, washing and drying to obtain the TiO2 / Ag-coated MoS2 composite photocatalyst. According to the Ag-coated MoS2 cocatalyst, the electron density of S atoms is higher, the strength of S (2 + delta)-Had bonds is weakened, and Had is more easily desorbed to form hydrogen; and the photocatalyst also has better light absorption and photo-generated charge separation efficiency, so that the photocatalyst shows better photocatalytic hydrogen evolution activity and stability.

The invention relates to a co-doped carbon nitride / phosphomolybdic acid composite catalyst as well as a preparation method and application thereof. The composite catalyst is composed of co-doped carbon nitride and phosphomolybdic acid loaded on the co-doped carbon nitride; the co-doped carbon nitride is graphite phase carbon nitride co-doped with sodium, phosphorus and oxygen, and the co-doped carbon nitride is prepared by mixing a cyanamide compound and sodium hexametaphosphate and calcining at high temperature. The composite catalyst is used for photocatalytic production of hydrogen peroxide, and a method for photocatalytic production of hydrogen peroxide comprises the following steps: dispersing the co-doped carbon nitride / phosphomolybdic acid composite catalyst in an aqueous solution containing a sacrificial agent, and performing photocatalytic preparation of hydrogen peroxide under irradiation of a xenon lamp. Compared with the prior art, the preparation method provided by the invention is simple and good in repeatability, the charge separation efficiency of the prepared photocatalytic material is remarkably improved, and the photocatalytic hydrogen peroxide preparation efficiency is high.

The invention discloses a detection method for high-sensitivity detection of chlorpyrifos based on OPECT and application, a prepared TiO2 / CdS / CPF gate electrode, an OECT transistor, a reaction chamber and a PBS buffer solution are assembled into a biosensor, an object to be detected is dropped on the surface of the gate electrode and irradiated by an LED light source, OPECT detection is carried out, and high-sensitivity and high-specificity detection of chlorpyrifos (CPF) is successfully realized. According to the detection method, a traditional gate electrode is replaced with a TiO2 / CdS heterojunction, the TiO2 / CdS heterojunction serves as a photosensitive gate to be introduced into an organic photoelectrochemical transistor (OPECT) system, the light absorption capacity and the charge separation efficiency are remarkably improved through the narrow-band gap synergistic effect of the heterojunction, and the bottleneck that traditional TiO2 is low in photoelectric conversion efficiency is solved.

The invention discloses a preparation method and application of a red carbon composite graphite phase carbon nitride photocatalytic material, comprising the following steps: S1, preparing a red carbon semiconductor: dissolving malonic acid in anhydride, reacting at a certain temperature by condensation reflux to obtain a product solution, dropping the solution into diethyl ether to obtain a solid precipitate, and washing with diethyl ether to obtain a red carbon semiconductor; S2, preparing a graphite phase carbon nitride: calcining a carbon nitrogen compound at a high temperature to obtain a graphite phase carbon nitride g-C3N4; S3, preparing a red carbon / g-C3N4 photocatalyst: compounding the red carbon semiconductor obtained in S1 with the graphite phase carbon nitride g-C3N4 obtained in S2 by an ultrasound-assisted method to obtain a red carbon / g-C3N4 photocatalyst. The red carbon composite g-C3N4 photocatalyst obtained in this scheme integrates the advantages of heterogeneous structure to improve charge separation efficiency and narrow bandgap red carbon to enhance visible light response, which is conducive to promoting photolysis of water to produce hydrogen, and the structure.

The invention discloses a UiO-66 (Ce) / ZnO composite photocatalyst as well as a preparation method and application thereof, and relates to the technical field of photocatalytic degradation of water pollution. The method specifically comprises the following steps: preparing zinc oxide by taking zinc acetate dihydrate, absolute ethyl alcohol and sodium hydroxide as raw materials; and dispersing the obtained zinc oxide in a DMF solution containing terephthalic acid, adding a ceric ammonium nitrate aqueous solution, and carrying out a heating reaction to synthesize the UiO-66 (Ce) / ZnO composite photocatalyst. According to the invention, ZnO and UiO-66 (Ce) are used for constructing a heterojunction for the first time, and the design not only widens the visible light response range, but also significantly improves the charge separation efficiency, thereby greatly enhancing the photocatalytic performance. The preparation process is simple and convenient, and the conditions are environment-friendly. The degradation rate of the obtained composite photocatalyst on tetracycline in waste water under visible light can reach 91.2%, the composite photocatalyst has good recoverability and reusability, a new scheme is provided for efficient degradation of organic pollutants, and the composite photocatalyst has remarkable advantages in the field of environmental protection.

The invention relates to the technical field of photocatalysis, in particular to a copper and titanium co-doped potassium niobate photocatalytic material and a preparation method thereof. Potassium niobate is partially substituted in the synthesis stage of potassium niobate through a hydrothermal method, the crystal structure of potassium niobate can be kept stable after doping, the light absorption range is widened, and the photocatalytic efficiency is improved. Other potassium niobate doped photocatalytic materials are difficult to consider both the performance and the practicability due to the problems of structural defects, charge imbalance, insufficient light absorption or poor stability and the like. Cu-Ti co-doping achieves breakthrough in the aspects of band gap regulation and control, charge separation and structural stability through a complementary mechanism, the peak value of transient photocurrent response and steady-state output are remarkably improved, and the optimal solution of potassium niobate modification is achieved.

The invention discloses a triarylmethane type I photosensitive dye as well as a synthesis method and application thereof. The structure of the dye is shown as a general formula I; intramolecular charge separation is optimized by regulating substituent groups, and the generation efficiency of superoxide anions and hydroxyl radicals is remarkably improved. According to the synthesis method, 4-diphenylaminobenzaldehyde or 4-vinyl benzaldehyde is used as a raw material, efficient preparation is achieved through the steps of condensation, oxidation and the like, the raw material is easy to obtain, and operation is easy and convenient. The dye has strong absorption at the wavelength of 600-630 nm, is suitable for red light triggered photodynamic therapy (PDT), especially keeps high reactive oxygen yield under the hypoxic condition, and breaks through the oxygen dependence limitation of traditional PDT. Experiments show that the dye can induce ferroptosis of tumor cells, has the functions of fluorescence imaging and treatment, and has wide application prospects in the fields of antitumor drugs, in-vivo fluorescence labeling, photoresponsive functional preparations and the like.

The invention belongs to the technical field of reverse osmosis membranes, and relates to a visible-light-responsive carbon nitride / zinc oxide heterojunction modified reverse osmosis membrane and a preparation method thereof.The method specifically comprises the steps that porous ultrathin carbon nitride nanosheets are prepared; synthesizing zinc oxide nanoparticles rich in oxygen vacancies; and compounding the two to form the Z-type heterojunction photocatalyst. The heterojunction is stably loaded in a polyamide separation layer through an interfacial polymerization process, the composite reverse osmosis membrane is prepared, and the membrane disclosed by the invention has a remarkable visible light response characteristic while maintaining a high desalination rate. The method has the core advantages that the visible light utilization rate and the photo-generated charge separation efficiency are remarkably improved through the construction of the heterojunction, so that the membrane can actively and efficiently degrade organic pollutants under illumination, self-cleaning is realized, the anti-pollution capacity is greatly improved, and the chemical cleaning period is greatly prolonged.

The invention relates to the technical field of photocatalytic materials, in particular to a multi-ion doped TiO2 nanosheet material suitable for degradation of dyes in water and a preparation method of the multi-ion doped TiO2 nanosheet material. The preparation method comprises the following steps: pre-embedding a self-sacrifice template in a germanium-tungsten composite doping solution, carrying out hydrothermal conversion to construct a Ge-W synergetic optimized regular TiO2 substrate, carrying out atomic layer deposition to realize nitrogen / silver uniform doping, and carrying out synergetic surface modification on silver nitrate-ethanolamine and perfluorosilane to prepare the TiO2 nanosheet material. Germanate serves as lattice strain guidance to guide TiO2 lattice growth to form a low-defect matrix, tungstate is cooperatively doped in the matrix to construct a strong built-in electric field to improve the charge separation efficiency, Ge-W elements cooperate to stabilize a bulk phase and a grain boundary, and a gradient protection barrier is constructed with selective shielding of a fluorosilane layer. The TiO2 catalyst is synergistically improved in the aspects of high catalytic activity and long-acting environmental stability, and is suitable for efficient pollutant purification in a complex water quality environment.

The invention relates to a photocatalytic fuel cell based on a cadmium sulfide titanium dioxide composite photo-anode and application, and relates to the technical field of preparation of novel photo-electrode materials, the cell adopts a continuous ion deposition method to prepare a CdS quantum dot modified TiO2 photo-anode with a specific layer number, and the CdS quantum dot modified TiO2 photo-anode, a platinum cathode and an ion exchange membrane form a synergistic system. The layer number and the particle size of CdS quantum dots in the photo-anode are accurately controlled, an efficient heterojunction structure is constructed, and the visible light utilization and charge separation efficiency is improved to the maximum extent; a chemical bonding effect is formed on the surface of the photo-anode by using carboxyl-containing organic fuel, so that an electron transmission path is obviously accelerated; the dual functions of organic wastewater degradation and electric energy synchronous output are achieved, and long-term operation stability is kept. The technology provides an efficient and low-consumption solution for resourceful treatment of industrial organic wastewater.

The application discloses a kind of efficient silicon-based water-voltage devices and preparation method thereof, the silicon-based water-voltage device is composed of positive electrode, hole selective transport layer, silicon nanostructure, silicon substrate and negative electrode from top to bottom, the top end part of the silicon nanostructure is embedded in the hole selective transport layer.This application introduces hole selective transport layer in the interface of silicon nanostructure / positive electrode, uses the internal electric field formed by high work function hole selective transport layer in interface to prevent the migration of electron to positive electrode, realizes the selective transport of hole, reduces interface recombination loss to improve charge separation and collection efficiency;At the same time, the hole selective transport layer introduced realizes the transition of silicon nanostructure and positive electrode from point contact to surface contact, reduces the contact resistance of positive electrode interface, further promotes the efficient transport of hole at interface, thereby increases the collection efficiency of electrode to hole, under the synergistic effect of the above, effectively improve the electrical properties of silicon-based water-voltage device.

The present invention discloses a preparation method based on an integrated cuprous oxide photocathode. The method includes the preparation of a protein template, the step of preparing a hole transport layer on a conductive substrate, the formation of an inverse protein cuprous oxide photonic crystal structure, and the preparation of a protective layer. Its feature lies in that the step of preparing the photocathode based on the multiple modification of cuprous oxide photonic crystals includes: self-assembling a nanoscale protein template on the substrate with a hole transport layer, then electroplating cuprous oxide and a protective layer by an electrochemical method, and finally forming a multifunctional photocathode with an inverse protein photonic crystal structure through a high-temperature pyrolysis method or a solvent adsorption and desorption method. The multi-layer modified inverse protein Cu2O photocathode obtained by the present invention presents an ordered porous structure and exhibits the characteristics of a photonic crystal. By controlling the size of the protein template, the internal morphology of the inverse protein photonic crystal is regulated, and with the assistance of superimposing multi-layer functional thin films, three goals are achieved: a, improving the light capture ability of the material; b, increasing the photogenerated charge separation efficiency and accelerating the transfer of photogenerated electrons-holes from the bulk to prevent their self-oxidation; c, and avoiding the self-reduction of cuprous oxide through the presence of the protective layer. In the photo-electrochemical catalytic carbon dioxide reaction, the integrated Cu2O photocathode efficiently converts carbon dioxide into carbon monoxide (Φ STC = 1.6%, Yeild CO = 46.7 mmol / h).