778 results about "Photoelectrochemistry" patented technology

A bias-free driven ion-based photoelectrochemical wastewater treatment system and method is disclosed. Through an ion-coupled photogenerated electron-assisted photocatalytic oxidation-reduction pathway, the system achieves efficient treatment of high-salinity wastewater. The system employs electron-ion receptor materials as the counter electrode, providing reaction sites to drive the coupling of photogenerated electrons and cation transfer. Additionally, the voltage generated by the system directly drives hole oxidation to produce strong oxidizing free radicals. Furthermore, this ion-based photoelectrochemical system demonstrates excellent degradation performance in high-concentration chloride media. This indicates that, in addition to cations (such as Na+) helping to accelerate the electron transfer rate, the presence of Cl− further enables efficient and sustainable wastewater treatment. The concept proposed in this invention emphasizes the potential for using abundant sodium chloride in seawater as an inexpensive additive for wastewater treatment.

The invention discloses a multifunctional interlayer modified silicon-based nanowire photoelectric cathode, which comprises a p-Si substrate layer, a nanowire morphology layer, a CdS layer and a MoS2 cocatalyst layer, the preparation method comprises the following steps: (1) cleaning the p-Si substrate, and blow-drying the p-Si substrate for later use; (2) depositing in a first deposition solution to prepare a p-Si substrate with silver particles adsorbed on the surface; (3) etching in an etching solution, and forming a nanowire structure on the p-Si substrate; (4) placing the nanowire structure in a second deposition solution for deposition, and forming a CdS layer on the nanowire structure; and (5) taking the p-Si substrate treated in the step (4) as a working electrode, and depositing in an electro-deposition solution to prepare the silicon-based nanowire photoelectric cathode. The CdS layer and the MoS2 co-catalyst layer in the photoelectric cathode reduce the lattice mismatch problem caused by direct loading of the CdS layer and the MoS2 co-catalyst layer, and meanwhile, the CdS layer and the MoS2 co-catalyst layer and the silicon substrate form a heterogeneous pn junction structure, and the photoelectrochemical performance is remarkably improved through a multi-layer synergistic effect.

The invention relates to the technical field of food safety detection, in particular to a Bi2WO6 / AuNPs / Ni-MOF composite material, a sensor and application of the Bi2WO6 / AuNPs / Ni-MOF composite material. The composite material is prepared from Bi2WO6 / Ni-MOF and AuNPs, can be used as a sensing substrate for modification, and is combined with a CRISPR / Cas12a system, so that an electrochemical and photoelectrochemical dual-mode combined aptamer sensor is constructed, and the composite material can be used for detecting 0.1 pg / mL to 100 ng / mL of OTA. Results obtained by different detection modes can be mutually verified, errors caused by external environment, instruments and parameter changes are reduced or eliminated, and therefore the detection reliability is improved. Meanwhile, the dual-mode sensor which is combined with the CRISPR / Cas12a system and adopts the Bi2WO6 / AuNPs / Ni-MOF composite material to modify the substrate also shows good selectivity and reproducibility, and has a wide application value.

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 preparation method and application of a nickel-cobalt oxide modified molybdenum-doped bismuth vanadate composite photo-anode, and belongs to the application field of hydrogen production through water decomposition in photoelectrochemical reaction engineering. The preparation method comprises the following steps: obtaining a Mo-BiVO4 photo-anode through an electro-deposition and calcination combined method, preparing a precursor solution containing bimetallic nickel and cobalt by using cobalt nitrate hexahydrate, nickel nitrate hexahydrate and boric acid, immersing the Mo-BiVO4 photo-anode into the precursor solution, and growing a nickel-cobalt oxide (NiCoOx) cocatalyst on the surface of Mo-BiVO4 by using a photo-assisted electro-deposition method, thereby obtaining the Mo-BiVO4 photocatalyst. According to the NiCoOx cocatalyst modified Mo-BiVO4 composite photoanode and the preparation method thereof, the photocurrent density of the optimal NiCoOx cocatalyst modified Mo-BiVO4 composite photoanode obtained by the preparation method disclosed by the invention is 5.2 times that of pure bismuth vanadate. The preparation method has the advantages of simple operation method, easily available raw materials, low economic cost and good stability.

The invention provides a borate loaded alpha-Fe2O3 photo-anode as well as a preparation method and application thereof, and belongs to the technical field of material science and photoelectrocatalysis. The preparation method comprises the following steps: S1, growing a beta-FeOOH film on FTO (Fluorine-doped Tin Oxide) conductive glass by utilizing a hydrothermal method; s2, the beta-FeOOH thin film is subjected to high-temperature annealing treatment in an inert atmosphere, and an alpha-Fe2O3 thin film is obtained; and S3, the alpha-Fe2O3 thin film is put into a boric acid solution to be soaked, then the soaked alpha-Fe2O3 thin film is subjected to low-temperature annealing treatment in an inert atmosphere, a borate thin film is formed on the surface of the alpha-Fe2O3 thin film, and the borate-loaded alpha-Fe2O3 photo-anode is obtained. According to the preparation method, the problems that alpha-Fe2O3 is poor in conductivity, low in charge transfer efficiency, high in overpotential of oxygen evolution reaction and the like are solved by means of the strategies of ion doping and surface loading of borate in the step S3, the photoelectrochemical performance of alpha-Fe2O3 is improved, and the borate loaded alpha-Fe2O3 photo-anode meets the application requirement in a photoelectrochemical cell.

The invention relates to a device and a method for photoelectrochemical mechanical polishing of a semiconductor substrate aiming at electric field uniform arrangement and light field intercoordination, and the device comprises a rack, a machine body unit, a polishing disc assembly, a conductive base, an LED ultraviolet light source, an electrochemical workstation and a moving assembly, the machine body unit is used for loading and unloading the polishing disc assembly; the electrochemical workstation and the LED light source power supply respectively supply power to the conductive base and the LED ultraviolet light source in the machining process, the LED ultraviolet light source is fixed on the polishing disc and acts on a semiconductor substrate workpiece in machining together with the polishing disc in the workpiece polishing process, and the semiconductor substrate workpiece is bonded on the conductive base. The LED light source directly irradiates the surface of a machined workpiece, the distance between the light source and a polishing solution is effectively shortened, the effect of a light field is improved, meanwhile, the intensity of the light field in different directions along the radius is adjusted, the light field and an electric field applied to the workpiece act together to guarantee uniform oxidation of the surface of the workpiece, and the flatness of the machined workpiece is guaranteed.

The invention provides a bismuth oxyhalide-bismuth oxysulfide in-situ heterojunction FT0 photoelectrode and a preparation method and application thereof, and belongs to the technical field of photoelectrochemistry. Bismuth nitrate pentahydrate serves as a raw material, bismuth oxyhalide crystals are formed on FTO through the reaction between halide and bismuth nitrate and in combination with an additive, bismuth oxyhalide-bismuth oxysulfide heterojunction is synthesized on the FTO through in-situ conversion by taking the bismuth oxyhalide crystals as a precursor, and the in-situ heterojunction photoelectrode with excellent photoelectric performance is prepared. A simple hot solvent method is adopted, operation is easy and convenient, low-cost raw materials are adopted, and the production cost is reduced. And meanwhile, in-situ conversion can enable a close-contact heterojunction interface to be formed between bismuth oxyhalide and bismuth oxysulfide, so that the response of an electrode to light is improved, the transfer of current-carrying electrons of the composite material is promoted, and the photoelectric property is greatly improved. And a new thought and method for in-situ synthesis of the heterojunction photoelectrode on the FTO is provided for the photoelectrochemical application industry.

The invention belongs to the technical field of environmental engineering, and discloses preparation of a phosphorus-bridged iron-nickel monatomic / TiO2-x nanotube array electrode and application of the phosphorus-bridged iron-nickel monatomic / TiO2-x nanotube array electrode in advanced treatment of pharmaceutical wastewater. The P-bridged Fe and Ni monatomic loaded TiO2-x NTA photo-anode material is prepared by adopting a template-quenching-exogenous calcination phosphating method. By optimizing and regulating a monatomic coordination environment, an atomic-scale interface structure and a carrier defect state, monatomic d orbital electrons are activated, interaction between monatomic and a carrier is enhanced, and the purpose of improving monatomic catalytic activity and stability is achieved. A photoelectrocatalytic degradation system is constructed on the basis of a FeNiPx / TiO2-x NTA photo-anode, a reaction energy barrier in the active species generation process is reduced through the synergistic effect between single atoms and a substrate, and the generation amount of active species in the system is increased. The material is simple in preparation method and easy for large-scale production, can be directly used in the existing photoelectrochemical device, and can greatly save the transformation and operation cost.

Methods, systems and devices for photo-electrolyitic PFAS destruction including a photoreactor vessel configured to receive an aqueous solution including PFAS, a UV light source configured to direct UV light onto the aqueous solution in the photoreactor vessel, a cathode within the photoreactor vessel configured to contact the aqueous solution, an anode in an electrolyte solution, an electrical power supply configured to provide a voltage difference between the anode and cathode, and a membrane or ionic bridge between the anode and cathode. The cathode may be a mesh and may have a high surface area construction with an electrochemically active surface area that is greater than the geometric surface area.

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 provides a preparation method of a TiO2 / Au-C3N4 heterojunction photoelectrochemical biosensor and an application of the TiO2 / Au-C3N4 heterojunction photoelectrochemical biosensor. Comprising the following steps: step 1, preparing TiO2 / FTO; step 2, preparation of TiO2 / Au-C3N4 (titanium dioxide / Au-C3N4); step 3, preparing a nucleic acid aptamer; and step 4, using the confining liquid mercaptohexanol. The preparation method comprises the following steps: firstly, preparing a TiO2 thin film by an electrophoretic deposition method, and then combining the TiO2 thin film with graphite phase carbon nitride (g-C3N4) doped with high-conductivity noble metal gold nanoparticles (Au NPs) to form a heterojunction; under an illumination condition, Au NPs and photons interact to generate a regional surface plasma resonance phenomenon, and a strong electromagnetic field and high-concentration high-energy carriers are formed on the surface of the nano structure in the process, so that the photocurrent response of the composite material is remarkably enhanced; besides, the introduced Au NPs can also form an Au-S bond with the DNA aptamer containing the-SH group, and more binding sites are provided, so that the capture capability of the aptamer is enhanced.

The invention provides a preparation method of a nanofiltration membrane for regulating and controlling interfacial polymerization reaction by utilizing carbon nitride photogenerated charge, and belongs to the technical field of water treatment membranes. The preparation method comprises the following steps: (1) adding carbon nitride film-making sol into an aqueous solution of a polyamine monomer, and carrying out ultrasonic dispersion to obtain a mixed dispersion liquid; (2) preparing an organic phase monomer solution; (3) adding an ultrafiltration support base membrane into the mixed dispersion liquid, infiltrating, then taking out, adding into the organic phase monomer solution, and carrying out interfacial polymerization reaction to obtain a high-permeability membrane containing an ultrathin polyamide separation layer; wherein the infiltration and the interfacial polymerization reaction are carried out under illumination; and (4) carrying out heat treatment on the high-permeability membrane containing the ultrathin polyamide separation layer to obtain the nanofiltration membrane. According to the preparation method disclosed by the invention, the photoelectrochemical characteristics of carbon nitride are utilized, and electrostatic repulsion exists between positive charges on the surface of carbon nitride and piperazine molecules under illumination, so that the interfacial polymerization rate is regulated and controlled, and the high-permeability nanofiltration membrane with an ultrathin polyamide separation layer is further prepared.

The invention relates to a photoelectrochemical system for synthesizing urea through co-reduction of carbon dioxide (CO2) and nitrate ions (NO3 <->). The system comprises a solar power supply system, a photoelectrocatalysis (PEC) reaction system, a raw material pretreatment system and a product recovery system. The PEC reaction system is communicated with the raw material pretreatment system and the product recovery system in series; and an integrated coupling reaction system is formed. According to the system, solar energy is used as a main energy source, and a co-reduction reaction of CO2 and NO3 <-> is realized through a novel PEC flow cell device, so that urea is directly synthesized. The reaction liquid is conveyed to a product recovery system through a pipeline, and a high-purity urea product is obtained through evaporative crystallization; unreacted CO2 and NO3 <-> can be circulated to the raw material pretreatment system through the reflux device and are further utilized. The method provided by the invention realizes efficient and green synthesis of urea, optimizes the whole process, reduces energy consumption and system complexity, has good economical efficiency and environmental friendliness, and is suitable for the fields of agricultural fertilizers, waste gas and wastewater resourceful treatment and the like.

The invention provides a photoelectrochemical biosensor based on a porous membrane as well as a preparation method and application of the photoelectrochemical biosensor, and belongs to the field of photoelectrochemical biosensors. The photoelectrochemical biosensor comprises an electrode, the electrode comprises ITO conductive glass and a composite film coated on the ITO conductive glass, the composite film is obtained by modifying a photosensitive material in a nano-pore channel of a porous film and then connecting a capture probe in the nano-pore channel, and the photoelectrochemical biosensor based on the porous film is obtained. The sensor has the following advantages: 1, other biomolecules can be detected by changing the type of the capture probe, and the sensor has excellent practical application value; 2, the ITO conductive glass is loaded with the porous membrane to replace a traditional metal electrode, so that the detection is accurate, the detection time is short, the cost is low, and the reproducibility and the stability are good;

The invention relates to the technical field of functional materials, and discloses a bionic hydrophobic anti-corrosion coating construction method which comprises the following steps: S1, substrate pretreatment: performing ultrasonic cleaning on a metal substrate to remove surface oil stains and oxides; s2, laser-electrochemical composite texturing: manufacturing a micron-nano hierarchical structure on the surface of the base material by adopting femtosecond laser, and then growing a metal organic framework layer on the nano structure in situ by adopting an electrochemical method; s3, plasma activation: bombarding the surface of the metal organic framework layer by adopting Ar / O2 mixed plasma; s4, carrying out gradient fluorosilane grafting; s5, filling the dynamic covalent network; and S6, roll-to-roll continuous coating is carried out. Through a laser-electrochemical composite texturing technology and a gradient fluorosilane grafting technology, the problems that a traditional hydrophobic coating is single in structure and poor in binding force are solved, and the effects that a micron-nano hierarchical structure is constructed on the surface of a metal base material, molecular gradient arrangement is formed, the hydrophobic performance is improved, and the interface binding strength is enhanced are achieved.

The invention belongs to the technical field of immunoassay and biosensing, and provides a preparation method of a photoelectrochemical sensor based on CuO-induced photocurrent polarity reversal. The invention provides a preparation method of the photoelectrochemical sensor based on CuO-induced photocurrent polarity reversal. Specifically, hollow polyhedral flower-shaped CuO with a unique inner cavity structure is adopted as a polarity induction factor, so that multiple light refraction and scattering effects are remarkably enhanced, and the light capture efficiency is improved. Besides, when CuO is introduced to the surface of the In2O3 / ZnCdS electrode as a photocurrent polarity reversal factor, due to the energy band structure difference between CuO and In2O3 / ZnCdS, the migration path of a photon-generated carrier is changed, and the photocurrent polarity is reversed from an anode to a cathode photocurrent, so that the detection specificity of the gastrin-releasing peptide is improved. The photocurrent polarity reversal strategy effectively eliminates potential false positive signal interference, and the accuracy and sensitivity of detection are remarkably improved. According to different photoelectrochemical signal intensities of to-be-detected substances with different concentrations, the gastrin-releasing peptide is detected.

The utility model discloses a photoelectrochemistry-based organic matter-rich wastewater hydrolysis device which comprises a hydrolysis acid production tank, a water inlet and a gas outlet are arranged on the hydrolysis acid production tank, the water inlet is connected with a water inlet pipe, the water inlet pipe is connected with a reservoir, a water delivery pump is arranged in the reservoir, the gas outlet is connected with a gas outlet pipe, and the gas outlet pipe is connected with a gas collection tank; a photoelectrochemical integrated device for accelerating the hydrolysis acid production process is arranged on the inner wall of the hydrolysis acid production tank, and a stirring device is arranged in the hydrolysis acid production tank; the hydrolysis acid production tank is provided with a main feed port and an auxiliary feed port, the bottom of the hydrolysis acid production tank is provided with a liquid outlet and a slag outlet, the liquid outlet is connected with a liquid outlet pipe, and the slag outlet is connected with a slag outlet pipe. The method is convenient, fast and high in feasibility, proliferation and metabolism of microorganisms are promoted through the photoelectrochemical integrated device, the reaction speed can be greatly increased, then the treatment effect and treatment efficiency of the wastewater are integrally improved, and the technical problems that existing organic matter-rich wastewater is poor in treatment effect and low in treatment efficiency are effectively solved.

The invention belongs to the field of organic electroluminescence, and provides a metal iridium complex, a preparation method thereof and an organic electroluminescent device. The structural general formula of the metal iridium complex is shown in the specification. The metal iridium complex provided by the invention has the advantages of low evaporation temperature, high photo-electrochemical stability, high luminous efficiency, long device life and the like, the preparation method provided by the invention is simple in process, the prepared product is high in purity and suitable for industrial production, and the problem that the luminous efficiency of an existing luminous material is insufficient is solved.

An X-ray photoelectron spectroscopy in-situ test sample table for high-temperature electrochemistry comprises a base, a gasket, a lower electrode, a lower gold ring, an upper gold ring and an upper electrode which are sequentially arranged from bottom to top. A sample is positioned between the upper gold ring and the lower gold ring; the lower electrode and the upper electrode are arranged in an annular structure, and the upper gold ring and the lower gold ring are located at the annular structure; the annular structure extends outwards and is provided with a contact part, so that the annular structure can be conveniently connected with an instrument sample injection support and a thermocouple; a gap is formed in the inner circumference of the annular structure of the upper electrode so that the upper gold ring can be exposed. The X-ray photoelectron spectroscopy in-situ testing device can be used for in-situ testing of the X-ray photoelectron spectroscopy of a sample under the conditions of high temperature, certain atmosphere and pressure intensity and external voltage or current, so that deep research can be better carried out in the subject fields of solid electrochemistry, photoelectrochemistry, film preparation and the like.

The embodiment of the invention provides a preparation method of a photoelectric biosensor and the photoelectric biosensor, and relates to the technical field of photoelectric sensing, and the preparation method comprises the following steps: preparing a biomass derived hierarchical porous carbon PBAC material, preparing PBAC interface blending adsorption layer carbon slurry according to the biomass derived hierarchical porous carbon PBAC material, and preparing working electrode slurry; performing chemical etching on ITO conductive glass to prepare an electrode substrate, printing the working electrode slurry on the electrode substrate by using a screen printing technology, and printing PBAC interface blending adsorption layer carbon slurry on the electrode substrate to obtain a working electrode; a colloidal gold solution is dropwise added to the working electrode, after drying, a probe solution is dropwise added to the surface of the working electrode again, incubation is conducted in a constant-temperature box, and the photoelectrochemical biosensor is obtained after the reaction is completed. According to the invention, the biocompatibility of the photoelectric biosensor is enhanced, and the stability and sensitivity of the sensor are improved.

The invention belongs to the technical field of food safety sensing detection, adsorption and degradation, and particularly relates to an MIP / MOF / COF hybrid material and a preparation method and application thereof. Aiming at the defects and bottleneck problems of the existing patulin detection and removal technology, the preparation method comprises the following steps: firstly preparing an MOF / COF composite material, and then preparing an MIP / MOF / COF hybrid material by a sol-gel method, so that the photoelectrochemical sensor based on the MIP / MOF / COF hybrid material is constructed and is used for detecting patulin; meanwhile, based on the MIP / MOF / COF hybrid material, an attachment and degradation test platform is constructed. The prepared photoelectrochemical sensor can successfully detect trace patulin, and the hybrid material has good adsorption and degradation performance on patulin.

The invention discloses construction and application of a confinement enhanced photoelectrochemistry-electrochemiluminescence dual-mode biosensor, and relates to the technical field of biosensing and analytical chemistry. The preparation method of the biosensor comprises the following steps: taking a CdS (at) SiO2 (at) NaYF4: Yb / Tm nano composite material as a substrate to obtain a confinement enhanced photoelectrochemistry (PEC) and electrochemiluminescence (ECL) sensing interface; in combination with a DNA wheel nanostructure triggered by target acetamiprid, signal amplification is realized; and synchronous dual-mode quenching detection of PEC and ECL signals is realized by virtue of peroxidase-like catalytic precipitation and wide-spectrum absorption characteristics of the PtPd-CoSnO3 nanocube. The biosensor prepared by the invention has the advantages of high sensitivity, strong reliability, good selectivity and the like, can be applied to accurate detection of acetamiprid in samples such as agricultural products and the like, and has important application value in the aspects of environmental monitoring and food safety control.

This disclosure relates to magnetic microgel beads, and in particular to magnetic microgel beads for biofunctionalization and methods of making and uses thereof, for example, in biosensing assays. In an embodiment, a magnetic microparticle comprising a magnetic nanoparticle encapsulated by a polymer hydrogel. In another embodiment, an assay for detecting the presence of a target analyte in a sample comprising a) the magnetic microparticle disclosed herein, wherein the biorecognition agent further comprises a reporter moiety; b) an electrochemical chip comprising a working electrode, a counter electrode and a reference electrode; and c) a capture probe functionalized on the working electrode; wherein binding of the biorecognition agent to the target analyte results in production of an electrochemical, electroluminescent or photoelectrochemical signal.

An rGO-modified InGaN nanorod photoelectrode material, and a preparation method therefor and the use thereof, which belong to the technical field of photoelectrodes. The photoelectrode material comprises an Si substrate, an InGaN nanorod layer arranged on the Si substrate, and an rGO layer arranged on the surface of the InGaN nanorod, wherein the rGO layer is made of a two-dimensional nanosheet material. The electrode material is used for preparing a photoanode, which serves as a photoanode for hydrogen production by means of photoelectrochemical water decomposition. The use of rGO not only broadens the absorption spectrum range of the photoelectrode material and effectively passivates the surface state of the nanorod, but also forms a heterostructure with the InGaN nanorod, which effectively reduces the initial potential, promotes the dissociation and transport of charge carriers and the oxidation reaction of the charge carriers on the electrode / electrolyte interface, and greatly improves the photoelectric conversion efficiency, thereby providing an effective strategy for achieving efficient PEC water decomposition hydrogen production.

The invention discloses a monoclinic-phase molybdenum-doped bismuth vanadate photoelectrode and a preparation method and application thereof, and belongs to the technical field of photoelectrochemical degradation of pollutants and hydrogen production. The monoclinic-phase molybdenum-doped bismuth vanadate photoelectrode is synthesized through a hydrothermal-annealing method, the monoclinic-phase molybdenum-doped bismuth vanadate photoelectrode stands in a sodium hydroxide solution before a tetragonal phase is converted into a monoclinic phase, then the monoclinic-phase molybdenum-doped bismuth vanadate photoelectrode is coated with a molybdenum salt solution, finally phase transformation is achieved through annealing, and the monoclinic-phase molybdenum-doped bismuth vanadate photoelectrode is obtained. The photoelectrode has a columnar structure composed of nanoparticles, has a large specific surface area, is beneficial to carrier separation, and has better performance of photoelectrochemically degrading amino acid and producing hydrogen. And the photoelectrochemical hydrogen production performance of the photoelectrode can be greatly improved and the degradation of the amino acid can be completed by dissolving the amino acid with a certain concentration in water.

The invention belongs to the technical field of organic photoelectrochemical transistors, and particularly relates to an organic photoelectrochemical transistor sensor based on a shadow effect Pt / n-Si grid and preparation and application of the organic photoelectrochemical transistor sensor. The sensor comprises a Pt / n-Si grid electrode based on the shadow effect and an organic photoelectrochemical transistor, the organic photoelectrochemical transistor comprises an electrolyte solution, a source electrode, a drain electrode and an organic semiconductor film, the source electrode and the drain electrode are spaced, the source electrode and the drain electrode are covered with the organic semiconductor film, and glucose oxidase and hydrogen peroxide horseradish enzyme are modified on the Pt / n-Si grid electrode. When the sensor is used for glucose detection, the two enzymes can catalyze glucose to generate cascade reaction to generate precipitates, photo-generated voltage generated by the grid electrode can be reduced along with increase of the precipitation amount, then the change of the grid electrode voltage is further amplified through channel current, then the detection sensitivity is greatly improved, and the sensor is light in structure and convenient to use. The method is easy to integrate, wide in application scene and good in development prospect.

The present invention relates to a perovskite photoanode and, more specifically, to a perovskite photoanode comprising: an oxygen generation part comprising a first lower electrode, a first electron transport layer formed on the first lower electrode, a perovskite first light absorbing layer formed on the first electron transport layer, a first hole transport layer formed on the first light absorbing layer, a first upper electrode formed on the first hole transport layer, a first Ni thin-film layer formed on the first upper electrode, and an oxygen evolution reaction catalyst layer formed on the first Ni thin film layer; and a passivation part comprising a second lower electrode, a second electron transport layer formed on the second lower electrode layer, a perovskite second light absorbing layer formed on the second electron transport layer, a second hole transport layer formed on the second light absorbing layer, a second upper electrode formed on the second hole transport layer, and a second Ni thin-film layer formed on the second upper electrode, wherein the first lower electrode and the second upper electrode are electrically connected to each other.

The invention discloses a preparation method and application of an ultrathin large-size hexagonal boron nitride nanosheet capable of being produced on a large scale, and belongs to the technical field of two-dimensional material preparation. The method comprises the following steps: 1, preparing a boron nitride dispersion solution; 2, performing ultrasonic oscillation on the boron nitride dispersion liquid by using an ultrasonic processor; 3, stirring the boron nitride dispersion liquid subjected to ultrasonic pretreatment at an ultra-high speed by using a wall breaking machine; and 4, centrifuging the stirred boron nitride, taking supernate, washing and drying to obtain the ultrathin large-size boron nitride nanosheet. The preparation method disclosed by the invention has the characteristics of simplicity, high efficiency, economy, environmental protection, high yield, high reliability, large-scale preparation and the like, and the prepared boron nitride nanosheet has the advantages of large sheet diameter, small thickness, uniform particles, high lattice integrity and the like, and can be applied to the fields of thermal management, energy storage and photoelectrochemistry of electronic devices.

The invention discloses a seawater chemical oxygen demand determination method based on bias voltage photoelectric oxidation, and relates to the technical field of water quality monitoring. The method comprises the following steps: collecting seawater and performing pretreatment to obtain a seawater sample; adding supporting electrolyte into the seawater sample to obtain an electrolytic water sample; the method comprises the following steps: injecting an electrolysis water sample into a photoelectrochemical reaction tank, applying bias voltage to a working electrode by taking Ag / AgCl as a reference electrode, and turning on a light source with a specific wavelength for irradiation; carrying out an oxidation reaction in the photoelectrochemical reaction tank, and after the oxidation reaction of the organic matter is complete, obtaining a steady-state photocurrent with a stable current signal; according to a preset steady-state light current-COD concentration curve, a COD measured value is obtained, the COD standard concentration value is corrected according to the water temperature and the salinity, and a COD corrected value is obtained. An adjustable tiny external bias voltage is introduced to cooperate with light source irradiation, so that rapid, accurate and high-anti-interference measurement of COD in seawater is realized.