469 results about "Photoelectrochemistry" patented technology

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 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 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 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 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.

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 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.

The invention discloses a carboxymethyl beta-cyclodextrin modified D-A COF material and a preparation method and application thereof.Benzotrithiophene is used as an electron donor, triazine is used as an electron withdrawing unit, imine-connected D-A COFs are successfully synthesized through a solvothermal method, the imino COFs and carboxymethyl beta-cyclodextrin are treated through a Ugi multi-component reaction, and the COF material is prepared. And the COFBTT-TAPT photoactive material containing the beta-cyclodextrin group is obtained through preparation. COFBTT-TAPT-beta-CD and Mxene form a heterojunction to further enhance the photoelectric conversion efficiency of the photoactive material, and the photoactive material is used for preparing a photoelectrochemical sensor, so that high-sensitivity field screening of PFOS (perfluorooctane sulfonate) can be carried out in a low concentration range.

The invention provides a wide-spectrum dual-photoelectrode-based photoelectrochemical sensor and a preparation method and application thereof, and belongs to the technical field of photoelectrochemical sensors. According to the photoelectrochemical sensor provided by the invention, a BCN / ITO electrode is used as a photoanode, a CuInS2 / ITO electrode is used as a photocathode, BCN is Bi2S3 / C3N4, and ITO is indium tin oxide. The sensor is used for detecting enrofloxacin and ciprofloxacin pollution. According to the present invention, the surface is modified with the aptamer having the specific recognition function, the specific binding effect of the aptamer with the enrofloxacin and the ciprofloxacin is utilized to form the complex of the aptamer and the target object, and the influence of the caused steric hindrance effect on the photoelectric signal and the dual-channel strategy are utilized to achieve the simultaneous detection of the residual marker; the linear ranges for detecting enrofloxacin and ciprofloxacin are 0.1 nM to 1 mu M and 50 pM to 0.5 mu M respectively, the detection limits are 24 pM and 15.5 pM respectively, and the method is successfully applied to simultaneous detection of residual markers in water. The method has the advantages of greenness, environmental protection, wide detection range, high sensitivity, good selectivity and high stability.

The invention discloses a cyromazine concentration detection and analysis method and system, and relates to the technical field of pesticide residue detection.The method comprises the specific steps that a cyromazine detection chip is prepared, an integrated signal probe is prepared, a detection reaction system is constructed, triple cooperative response signals are collected, multiple signals are fused, and the cyromazine concentration is calculated; the cyromazine detection chip and the integrated signal probe are prepared, the fluorescence, electrochemistry and SERS triple synergistic response signal acquisition technology is combined, the accuracy of cyromazine concentration detection is improved, the gold nanoparticle modified substrate and the gold nanorod loaded fluorescence and electrochemical active substances are utilized, the response strength of the signal probe is enhanced, and the sensitivity of the signal probe is improved. The fluorescence spectrophotometer can detect cyromazine with lower concentration, meanwhile, the electrochemical workstation and the Raman spectrometer are introduced, so that the electrochemical peak current and SERS characteristic peak displacement are accurately acquired, signals from different sources are normalized, and errors existing among single signals are eliminated.

The invention belongs to the technical field of electrochemical detection sensors, and particularly relates to a photoelectrochemical sensor for dopamine concentration detection and a preparation method and application thereof. The photoelectrochemical sensor comprises a working electrode, a counter electrode and a reference electrode, and specifically, the working electrode, the counter electrode and the reference electrode are sequentially connected to an electrochemical workstation to obtain the photoelectrochemical sensor. The working electrode is an indium tin oxide electrode; a Bi4O5Br2 / g-C3N4 / Au composite material is deposited on the surface of the indium tin oxide electrode. The sensor provided by the invention is excellent in detection performance, has the advantages of simple preparation process, low cost, good environmental stability and the like, provides a reliable new method for clinical dopamine detection, and has an important application prospect in early diagnosis of neurodegenerative diseases such as Parkinson's disease and the like.

The invention discloses a construction method and application of an electrochemical luminescence (ECL) biosensor based on a cell membrane hydrogel antifouling interface, and belongs to the technical fields of photo / electrochemical analysis, interface antifouling and biosensing. According to the invention, the cell membrane hydrogel is used as an efficient antifouling interface, so that non-specific adsorption of interfering proteins in a sample to be detected is hindered, and the service life of the biosensor is prolonged. Meanwhile, a luminophor copper nanosheet and a quencher MnO2 nanosheet are both introduced into the cell membrane hydrogel, in the presence of alkaline phosphatase (ALP), L-ascorbic acid-2-trisodium phosphate is catalyzed and hydrolyzed into ascorbic acid, and then MnO2 is reduced to recover ECL emission of the copper nanosheet. Therefore, the ECL signal of the biosensor is in a rising trend along with the rising of the ALP concentration. Based on this, the constructed ECL biosensor realizes sensitive detection of ALP, the linear range is 10 <-5 >-10 < 4 > U / L, and the detection limit is as low as 3.4 * 10 <-6 > U / L, which indicates that the ECL biosensor has potential application in clinical diagnosis.

This invention discloses a copper-based ternary chalcogenide semiconductor material, its preparation method, and its applications. The material is prepared by mixing CuSn(OH)6 nanomaterials, thioacetamide, ethylenediaminetetraacetic acid, and water and carrying out a hydrothermal reaction to obtain Cu3SnS4 nanomaterials. This semiconductor material exhibits excellent photoelectrochemical properties. Photoelectrochemical sensors constructed based on this material demonstrate high detection accuracy, fast response speed, low detection limit, and strong stability, enabling rapid and accurate real-time detection of microplastic content. The preparation method is simple, low-cost, and suitable for industrial production.

The invention provides an organic photoelectrochemical synaptic transistor and a preparation method and a regulation and control method thereof, and belongs to the technical field of transistors. The transistor comprises a substrate, a gate electrode, a source electrode, a drain electrode, an organic semiconductor channel layer and an electrolyte layer; according to the invention, various synaptic plasticity functions can be realized on a single synaptic transistor device through a simple and efficient preparation process; the method has the advantages of simplicity, high efficiency and convenience in large-scale integration. The synergistic effect of photons, electrons and ions is used as a regulation and control mechanism, a single-component n-type organic semiconductor is used as a channel layer material, voltage programming pulses are applied to a grid electrode, light irradiation is applied to a channel layer to simulate biological synaptic stimulation, output current is obtained at a source electrode and a drain electrode to simulate post-biological synaptic current, and the potential safety hazard is eliminated. Information encryption, compiling, hiding and recovery of the Morse code are simulated based on the output pulse current, and the method can be widely applied to the brain-like intelligence field of cognitive judgment with information double anti-counterfeiting encryption.

The invention relates to the field of photoelectrochemistry, in particular to a photo-anode based on phosphonic acid chelation and photoelectrochemistry activation and a preparation method of the photo-anode. The invention aims to provide a deep-energy-level defect dynamic passivation method based on phosphonic acid chelation and photoelectrochemical synergistic activation, which comprises the following steps: introducing 1-hydroxyethylidene-1, 1-diphosphonic acid (HEDP) molecules (ZISH) on the surface of a zinc-indium-sulfur (ZIS) photo-anode in a low-temperature water bath manner, and carrying out chelation reaction on the molecules and Zn sites on the surface in a photoelectrochemical activation manner, so as to obtain the deep-energy-level defect dynamic passivation method based on phosphonic acid chelation and photoelectrochemical synergistic activation. And a stable Zn-O-P coordination structure is formed. Under the action of photoelectric bias, the structure can reconstruct a Zn-S frame in situ, adjust the coordination number of Zn and convert a deep trap into a shallow energy level state (ZISA), so that interface recombination is effectively inhibited while a high hole injection rate is maintained.

The invention belongs to the technical field of biological analysis and detection, and particularly relates to a photoelectrochemical-colorimetric dual-mode biosensor and application thereof in miRNA detection. According to the biosensor prepared by the invention, the bifunctional CuO-Cu2O nanoflower and the three-dimensional network g-C3N4 / AuNPs electrode are integrated, and an enzyme-assisted strand displacement signal amplification mechanism is combined, so that dual-mode collaborative detection of a target miRNA-21 is realized: in a photoelectrochemical mode, the detection limit reaches 0.35 fM (the linear range is 1 fM to 10 fM), and response is performed based on photocurrent polarity reversal; the colorimetric mode is as follows: the detection limit is 3.9 fM (the linear range is 10 fM to 10 nM), and TMB (Tetramethylbenzidine) color development visualization analysis is carried out. Single-mode interference is effectively eliminated through double-signal independent output and cross validation, and the method is suitable for high-reliability detection of trace miRNA (such as a breast cancer marker miRNA-21) in complex samples such as serum. According to the invention, the defects of insufficient sensitivity (pM level), poor anti-interference performance and high platform complexity in the prior art are overcome, and an efficient tool is provided for early diagnosis of cancers.

The application discloses a kind of detection pesticide water amitraz integrated organic photoelectrochemical transistor sensor construction method.The application is integrated on the same fluorine-doped tin oxide conductive glass chip by laser etching technology to have the gate, source, drain three electrodes of organic photoelectrochemical transistor.In order to improve the activity and stability of grating material, the method of encapsulating Pd NPs in Cu-MOF and pyrolyzing is adopted, and Pd NPs / p-Cu-MOF is formed.Pyrolysis Cu-MOF with three-dimensional MOF structure as active carrier can load more Pd NPs, and the redox active copper metal elements contained therein will cause electron transfer between carrier and Pd NPs, so as to adjust the electronic state of metal active site and improve its catalytic performance.Schottky junction is formed between Pd NPs and p-Cu-MOF, which promotes the separation of electrons and holes.Pd NPs / p-Cu-MOF is used as photoactive gate material, and amino amitraz aptamer with carboxyl on the material is used as recognition element, so as to realize the OPECT sensing detection of ICP.

The present invention discloses a photoelectrochemical sensor for the detection of hexavalent chromium ions. The photoelectrochemical sensor is a modified ITO glass electrode, and the modification material is a photosensitive composite film with high-sensitive optoelectronic activity. Due to the strong absorption effect of the photo electron acceptor on the photo electrons generated by the photosensitive complex, the sensor can generate a strong cathodic photoelectrochemical signal. By utilizing the enrichment performance of the photosensitive composite film for hexavalent chromium ions, and under the conditions of light illumination and an applied bias voltage, weakly conductive reduction products can be generated on the surface of the photosensitive composite film, which effectively reduces the conductivity of the photosensitive composite film, inhibits the optoelectrochemical activity, hinders the transfer of photo electrons to the electron acceptor, quenches the photocurrent, and the quenched photocurrent has a correlation with the content of hexavalent chromium. In the present invention, the preparation of the sensor is simple, the cost is low, the response is fast, the sensitivity is high, the detectable range is wide, and the detection limit is as low as 5 pM. The rapid determination of hexavalent chromium in environmental water bodies, drinking water and food can be realized.

The invention relates to a method for controlling biological pollution of a reverse osmosis membrane through photoelectrochemical filtration pretreatment. According to the method, a photoelectrochemical reactor is mainly established to inhibit the bacterial biofilm forming ability under ultraviolet illumination and voltage conditions. The photoelectric chemical reactor is composed of a peristaltic pump, a magnetic stirrer, a reactor, an electrochemical filtering assembly, a direct-current power source and an ultraviolet light source and inhibits bacteria added into the reactor from forming a biological membrane. Under the action of voltage, the electrochemical filter assembly inhibits the biofilm forming ability and viability of bacteria by degrading protein and quorum sensing signal molecules in water, and more thoroughly inhibits the biofilm formation through the irradiation of ultraviolet light. Therefore, according to the method disclosed by the invention, the ultraviolet light can be combined with the electrochemical filter assembly to realize effective inhibition of a biological membrane formed by bacteria, the reduction of membrane flux is reduced, and the method has important significance in controlling biological pollution of the reverse osmosis membrane.

The application discloses a kind of gold nanoparticle loaded oxygen-doped ultrathin porous boron nitride film electrode and preparation method thereof, the preparation method includes the following steps: according to mass ratio 1:3-6:0.25-0.35, boric acid, urea, oxalic acid is prepared oxygen-doped ultrathin porous boron nitride, then gold nanoparticle is loaded oxygen-doped ultrathin porous boron nitride and coated on conductive substrate to form film electrode.The oxygen-doped ultrathin porous boron nitride film electrode loaded with gold nanoparticles prepared by the application has the advantages of large specific surface area, high electron-hole separation efficiency, fast electron transfer rate, etc., is a new type of film electrode with excellent photoelectric performance, meets the actual production demand, and has wide application prospect in photoelectrochemical field.The preparation method also has the advantages of simple process, easy operation, high preparation efficiency and low cost, and is suitable for large-scale preparation, which is beneficial to industrial application.

This invention discloses an energy storage type TiO2 / CN X The photoanode of WO3 composite material and its preparation method include the following steps: preparing WO3 nanorods by hydrothermal method; adding WO3 nanorods and anionic surfactant to water, sonicating, adding pyrrole, stirring, and then adding an initiator solution dropwise under ice bath conditions, stirring, and obtaining WO3 / PPy composite after reaction; adding WO3 / PPy composite and anionic surfactant to an alcohol solution, sonicating and stirring, adding tetrabutyl titanate, glacial acetic acid and acetone, and then adding an aqueous alcohol solution dropwise, transferring to a hydrothermal reactor for reaction, obtaining precursor TiO2 / PPy / WO3 composite after hydrothermal reaction; loading the precursor TiO2 / PPy / WO3 composite onto a conductive substrate. TiO2 / CN X / WO3's excellent sustained photocathode protection performance can be attributed to the highly conductive CN X In synergy with WO3, a narrow-bandgap semiconductor with energy storage properties, TiO2 nanoparticles with stable photoelectrochemical properties serve as the main material, ensuring the stability of the photoelectric performance of ternary materials.

The invention discloses a titanium dioxide nanorod / dissimilar metal MOFs heterojunction material and a preparation method and application thereof, and belongs to the technical field of photoelectrochemistry seawater hydrogen production. Soluble nickel salt, soluble cadmium salt or soluble cobalt salt and ammonium molybdate are adopted as metal sources, spherical dissimilar metal MOFs grow on the surface of a TiO2 nanorod in situ, and the TiO2 nanorod / dissimilar metal MOFs heterojunction material is prepared. According to the present invention, the oxygen deficiency-regulated dissimilar metal MOFs material (i.e., the titanium dioxide nanorod / dissimilar metal MOFs heterojunction material) is obtained through subsequent acid etching and annealing treatment, the material is subjected to in-situ reconstruction during the OER process to spontaneously form the active hydroxide (NiOOH) of anion protection (MoO4 < 2->), and the excellent stability is represented; only small Faraday efficiency loss (1.2-2.3%) occurs in a high chloride ion environment (3.5 wt%-7wt% of NaCl), and an extensible path is provided for industrial-scale solar hydrogen production by using seawater.

The present application relates to the field of dehumidification, in particular to a photoelectrochemical auxiliary dehumidification device driven by shadow effect, the upper layer is super-hygroscopic hydrogel, the middle layer is photoelectrochemical cell, and the lower layer is shadow effect device; in the photoelectrochemical auxiliary dehumidification system provided by the present application, the moisture absorbed by the hydrogel is rapidly decomposed by the photoelectrochemical cell with enhanced voltage generated by the shadow effect device. The absorption of atmospheric moisture by the hydrogel and the voltage generated by the light contrast difference of the shadow effect device caused by the transparent photoanode of the photoelectrochemical cell from the upper layer and the light-tight photocathode result in continuous dehumidification of the closed space under zero energy input, the relative humidity in the room can be maintained below 70% without additional energy input, and a certain stable current is generated, which improves the efficiency of the dehumidification system and reduces energy consumption, and has wide application prospect.

The present application relates to a kind of hAAG photoelectrochemical detection method based on sulfur vacancy engineering, belong to analytical detection technical field.The present application will prepare hairpin structure DNA to single-stranded DNA, sequentially join different concentrations of human alkyladenine DNA glycosylase (hAAG), endonuclease IV, exonuclease I and its reaction buffer;Dopamine solution is added to reaction, and the enzymatic reaction system of hAAG is obtained;CdZnS modified electrode is immersed in enzymatic reaction product solution and reacts, so that dopamine and zinc atom on the surface of CdZnS are combined by ortho-hydroxy coordination, and sulfur vacancy is induced to generate;Photoelectrochemical test is carried out to CdZnS modified electrode, the photocurrent signal is detected, the linear relationship between photocurrent signal and hAAG concentration is established, and the quantitative detection of hAAG is realized.The present application not only provides efficient strategy for hAAG detection, but also provides new ideas for performance optimization of sulfide-based photoelectrochemical device.

The application provides a construction method of a photoelectrochemical enzyme sensor based on signal polarity flip, and steps are as follows: step 1, preparation of BiOBr nanosheet; step 2, preparation of CuMOF nanosheet; step 3, preparation of BiOBr / CuMOF nanocomposite; and step 4, construction of a signal flip type photoelectrochemical sensor. The prepared BiOBr / CuMOF is used as a working electrode to create a sensitive photoelectrochemical sensing platform. The polarity of a photoelectric current signal is flipped by using a target, and the detection system plays a role in eliminating background signals and enhancing anti-interference capability. When the target ALP exists, ascorbic acid-2-phosphate magnesium (AAP) in the solution is decomposed under the catalysis of ALP to generate ascorbic acid, and the Bi 3+ -O bond in BiOBr is broken to generate an oxygen vacancy, so that the photoelectric current signal is flipped, the relationship between the photoelectric current response value and the ALP concentration is established, and the purpose of rapid, sensitive and selective detection of the ALP content in human serum is achieved.

The application discloses a functionalized gold-silver nanowire alloy composite photoelectric material and a preparation method and application thereof. A pillar[6]arene molecule AuAg@WP6 capable of undergoing host-guest complexation with a serotonin molecule 5- HT is wrapped on the surface of gold-silver nanowire alloy AuAg NWs, and the AuAg@WP6 / rGO-C3N4 is loaded on a reduced graphene oxide and carbon nitride rGO-C3N4 composite material to design a PEC biosensing system. The AuAg@WP6 / rGO-C3N4 serves as a sensing material. The LSPR effect of the AuAg NWs under visible light irradiation promotes charge separation. The host-guest complexation of the WP6 can selectively adsorb a large amount of 5- HT to the surface of the material. Since the g-C3N4 and the rGO have similar pi-conjugated structures, the two are easy to be bonded to form the rGO-C3N4 composite material. The photo-induced holes on the rGO-C3N4 can accelerate the oxidation of the serotonin molecule, and further improve the photocurrent response to detect 5- HT. Based on the excellent photoelectrochemical performance of the composite material, the linear range for detecting 5- HT is 0.01-100 muM, and the detection limit is 2 nM (S / N=3).

This invention relates to the field of photoelectrochemistry, and more particularly to a photoanode based on phosphonic acid chelation and photoelectrochemical activation, and its preparation method. The purpose of this invention is to provide a method for dynamic passivation of deep-level defects based on the synergistic activation of phosphonic acid chelation and photoelectrochemical activation. 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) molecules (ZISH) are introduced onto the surface of a zinc indium sulfide (ZIS) photoanode via a low-temperature water bath. Photoelectrochemical activation is then used to induce a chelation reaction between HEDP and Zn sites on the surface, forming a stable Zn–O–P coordination structure. Under photoelectric bias, this structure can reconstruct the Zn-S framework in situ, adjusting the coordination number of Zn and converting deep traps into shallow-level states (ZISA), thereby effectively suppressing interfacial recombination while maintaining a high hole injection rate.