160results about How to "Improve photoelectrochemical performance" patented technology

The invention discloses a method for preparing a Bi/BiVO4 composite photoanode material by photodeposition. The method comprises the following steps: soaking a BiVO4 electrode in an ethylene glycol/water mixed solution of Bi(NO3)3 5H2O, and illuminating to uniformly generate a layer of an ash black film on the surface of the BiVO4 electrode; and washing with ethyl alcohol to obtain a Bi/BiVO4 composite photoanode. According to the method, metal Bi particles are successfully loaded on a multihole BiVO4 thin film in a simple photo-reduction process; furthermore, introduction of the metal Bi particles enlarges an absorption range of bismuth vanadate to visible light; meanwhile, electrons in the metal Bi particles are transferred onto a BiVO4 conduction band to increase the concentration of current carriers; and a hole in the BiVO4 surface in a pure Na2SO4 solution oxidizes part of the metal Bi nano particles, so that separation of electron-hole pairs is effectively promoted, and the photoelectric chemical decomposition performance of water is improved.

The invention provides a preparation method of a CdSe/CdS quantum dot sensitized TiO2 nanometer tube composite film, which relates to a nanometer tube composite film. A titanium foil is used as a substrate, ammonium fluoride is dissolved into deionized water, glycerin is added for carrying out calcination after the anode oxidation, CdS quantum dos are firstly deposited on the surface of a TiO2 nanometer tube array film, Cd(NO3)2 ethanol solution and Na2S methanol solution are respectively used as reaction solution, firstly, TiO2 nanometer tube array film samples are soaked in Cd<2+> ethanol solution, then, ethanol is used for flushing, next, the samples are soaked into methanol solution containing S<2-> and are than flushed by the ethanol, CdS/TiO2 composite films are obtained, the obtained CdS/TiO2 composite films are placed into mixed solution consisting of Na2SeSO3, Cd(NO3)2 and Na3NTA solution for carrying out deposition reaction, and the CdSe/CdS quantum dot sensitized TiO2 nanometer tube composite film is obtained.

The invention relates to a preparation method of a heterojunction thin film composed of same metals and oxygen family elements. The preparation method comprises the following steps: mixing metal salt,acid and water to obtain a metal precursor solution; depositing the metal precursor solution on the surface of a base under the conditions that the pH is 2-11, and the temperature is 30-90 DEG C to form metal oxide; performing heat treatment on the metal oxide and at least one of sulfur source and selenium source for 2-120 minutes at a temperature of 100-600 DEG C and an air pressure of minus 0.05-1 MPa to obtain the heterojunction thin film; the heterojunction thin film is a metal oxide-sulfide heterojunction thin film, a metal oxides-selenide heterojunction thin film or a metal oxide-sulfide-selenide heterojunction thin film. The invention further discloses the heterojunction thin film prepared by the preparation method provided by the invention and application thereof. The preparationmethod has the advantages of being simple in equipment, low in cost, easy for large-area continuous production and the like; the prepared thin film is controllable in thickness component, dense and uniform in appearance and good in crystallization and optoelectronic properties.

The invention relates to a titanium dioxide (TiO2) nanotube/ graphene composite material and a preparation method thereof. The method includes utilizing graphite as a raw material, conducting oxidizing and peeling to obtain graphene oxide stably dispersed in solution, conducting suction filtering and drying to obtain graphene oxide powder, stirring TiO2P25 nanometer particles, alkali liquid and alcohol organic solvent in mixing mode, then adding the the graphene oxide powder into the mixture to be dispersed, delivering obtained mixed liquid into a reaction kettle, conducting closed reaction, conduct cooling to the room temperature, conducting separation to obtain white precipitate and conducting washing and burning to obtain the TiO2 nanometer/ graphene composite material. The TiO2 nanometer/ graphene composite material is high in solar energy utilization ratio, free of self particle agglomeration and free of re-accumulation of graphene slice layers. Simultaneously, raw materials are easy to obtain and low in cost. The preparation process is simple and safe. The material has potential application value in the fields of electrode materials, photocatalysis, solar energy splitting water, solar cells, environment and the like.

The invention belongs to the technical field of photoelectrochemistry, and particularly relates to a preparation method and the application of a heterojunction photoelectrode. The preparation method comprises the steps of firstly forming a double-layer TiO2 nano-rod array on an FTO substrate; then, uniformly coating the double-layer TiO2 nano-rod array with a layer of oxidized-reduced grapheme by utilizing a spin coating method; finally, loading CdS@Au core-shell-structured nano particles on the surface of oxidized-reduced grapheme/TiO2 by using a chemical deposition method and a photo-deposition method. An Au@CdS/RGO/TiO2 heterojunction photoelectrode which is prepared by utilizing a simple hydrothermal synthesis method, the spin coating method, the chemical deposition method and the photo-deposition method has the advantages of good chemical stability and good photoelectrochemical performance. The preparation method disclosed by the invention has the advantages that the technology is simple, the repeatability is good, materials which are used are cheap and are easy to get, and the requirement on environmental friendliness is met.

The invention belongs to the technical field of an environmental material, and particularly relates to a molybdenum and carbon-codoped titanium oxide nanotube array thin film material and a preparation method thereof. The molybdenum and carbon codoping of a titanium oxide nanotube can be realized by introducing molybdenum element into the titanium oxide nanotube formed on a titanium sheet and the surface thereof through alloying, and then introducing carbon element through carbon monoxide atmospheric thermal treatment; in the obtained molybdenum and carbon-codoped titanium oxide nanotube array thin film material, a part of titanium atoms in the titanium oxide nanotube are replaced by molybdenum, a part of oxygen atoms are replaced by carbon, the ratio of the molybdenum atoms to carbon atoms ranges from 0.03 to 0.15, and the ratio of the doped carbon atoms to titanium atoms ranges from 0.01 to 0.09. The thin film material is attached to a titanium alloy substrate, and comprises orderly titanium oxide nanotubes perpendicular to the substrate. The photocatalysis and photo-electrochemical properties of the thin film material in visible light are far higher than those of the traditional titanium oxide thin film material, and the thin film material has excellent application prospects on the aspects of photocatalytically degrading organic matters in water and reducing heavy metal ions.

The present invention provides: an organic compound increasing an open circuit voltage, and showing high photoelectric conversion efficiency; a semiconductor film electrode employing the organic compound as a dye; a photoelectric conversion element employing the semiconductor film electrode; and a photoelectrochemical solar cell employing the photoelectric conversion element. The organic compound is represented by the following general formula:

wherein A is a carbazole ring; L₁ is an electron transfer linking group having at least one heterocyclic ring selected from the group consisting of a thiophene ring, a furan ring, a pyrrole ring, and a condensed heterocyclic ring formed from any combinations of these rings; R is a substituent group bound to at least one electron transfer linking group selected from the group consisting of an alkyl group, an alkoxy group, and an aryl group; X is at least one electron withdrawing group selected from the group consisting of a cyano group, a carboxylic acid group, an ester group, an amide group, a trifluoromethyl group, a pentafluoroethyl group, a sulfonate group, and a trifluoromethanesulfonate group; M is a hydrogen atom or a salt-forming cation; and n is an integer of 1 to 12.

The invention discloses a preparation method of a copper-zinc-tin-sulfur (CZTS) thin film. The preparation method includes the first step of preparing a precursor solution, dissolving copper chloride, zinc chloride, stannous chloride and thiourea jointly into methyl alcohol or ethyl alcohol and stirring the solution to be clear and transparent, the second step of carrying out ultrasonic cleaning on a substrate FTO in acetone, ethanol and deionized water respectively and sequentially, the third step of coating the precursor solution on the surface of the substrate FTO and then drying the substrate FTO, and the fourth step of placing a sample obtained in the third step into nitrogen or argon for calcining to obtain the CZTS thin film. The preparation method of the CZTS thin film is simple, easy to implement and suitable for mass production; the prepared CZTS thin film is smooth in surface, free of cracks, excellent in performance, good in photoelectrochemical performance, high in chemical stability and capable of being widely applied to the field of production of semiconductor nano-films and photoelectrocatalysis.

The invention discloses a photoelectrochemical adaptor sensor as well as a preparation method and application thereof. The photoelectrochemical adaptor sensor comprises a conductive glass electrode, wherein the reacting end surface of the conductive glass electrode is modified with a composite membrane consisting of phosphorus hybridization graphite phase carbon nitride nanosheets loading gold nanoparticles; and a specific adaptor probe is self-assembled on the surface of the membrane. The preparation method of the photoelectrochemical adaptor sensor comprises the following step: modifying thephosphorus hybridization graphite phase carbon nitride nanosheets loading the gold nanoparticles and the specific adaptor probe on the reacting end surface of the conductive glass electrode. The sensor disclosed by the invention has the advantages of high stability, long service life, high anti-jamming capability, wide detection range, low detection limit and the like. The preparation method of the photoelectrochemical adaptor sensor has the advantages of simple technology, convenient operation, safety, low cost, no pollution, high production efficiency and the like. The sensor disclosed by the invention can be widely applied to detecting pollutants (such as antibiotics) in mediums such as a water body and a living body and has the advantages of high utilization rate, wide application range, high application value and the like.

The invention belongs to the technical field of synthesis of nano-composite materials, relates to a preparation method of a composite electrode, and especially relates to a preparation method and an application of a Cu-MOF/BiVO4 composite photoelectrode. The preparation method of the Cu-MOF/BiVO4 composite photoelectrode comprises the following steps: preparing BiVO4 with a wormlike structure on an FTO substrate by electrochemical deposition and calcination processes, controllably loading a layer of Cu-O on the surface of the BiVO4 by the electrochemical deposition process, and reacting the Cu-O with an organic ligand by means of a hydrothermal synthesis process to introduce an ultrathin Cu-MOF film on the surface of BiVO4 in situ. The composite photoelectrode can also be applied to a photoelectrochemical water decomposition reaction as a working electrode. The method allows the ultrathin Cu-MOF to be loaded on the surface of BiVO4 with the worm-like structure by the simple and feasible method, can effectively improve the electron and hole separation efficiency of the photoelectrode and enhance the ability to capture visible light in order to construct the novel composite photoelectrode capable of efficiently converting solar energy-chemical energy, and has excellent photoelectrochemical performances and a good chemical stability; and the method has the advantages of simple process, good repeatability, and meeting environmentally friendly requirements.

The invention belongs to the technical field of nano composite materials and relates to a synthesis method of a BiVO4-Ni/Co3O4 heterojunction. The synthesis method comprises the following steps of: growing a layer of BiOI nanoparticles on an FTO substrate by adopting an electro-deposition method; dropwise adding a vanadyl acetylacetonate aqueous solution on the surface of the FTO; performing calcining at a high temperature to generate bismuth vanadate (BiVO4); obliquely placing FTO in a deionized water solution containing Co (NO3) 2.6 H2O, Ni (NO3) 2.6 H2O, C6H12N4, CH4N2O and NH4F through continuous ion adsorption reaction; performing hydrothermal reaction at 120-200 DEG C for 2-5 hours, taking out an obtained product, cleaning the product with deionized water; annealing the product at 300-500 DEG C for 1.5-3 hours; and naturally cooling the product to room temperature to obtain the BiVO4-Ni/Co3O4 heterojunction. The prepared heterojunction is used as a photoelectrode to be applied tophotoelectrochemical hydrolysis reaction. According to the preparation method, a simple electro-deposition method and a hydrothermal method are utilized, therefore, the method is simple in operationand has good repeatability; the used materials are low in cost, large in reserves and non-toxic, and meets the requirement for environmental friendliness; the prepared material can significantly reduce the interface reaction barrier, effectively inhibit solid-liquid interface charge recombination, accelerate water oxidation reaction kinetics and improve the photocurrent density so as to better utilize solar energy.

The invention discloses a preparation method of a molybdenum disulfide composite material. The preparation method includes the steps: (1) dispersing graphene oxide into water, adding sodium molybdateand thioacetamide, performing hydrothermal reaction to obtain an MoS2/reduced graphene oxide composite material; or dissolving the sodium molybdate and the thioacetamide in the water and performing hydrothermal reaction to obtain petaloid MoS2; (2) soaking the composite material or petaloid MoS2 obtained in the step (1) in porphyrin solution to obtain the molybdenum disulfide composite material. According to the composite material prepared by the preparation method, the photoelectrochemical properties of molybdenum disulfide can be remarkably improved, and the application of the molybdenum disulfide to the field of photocatalytic degradation of organic matters is promoted.

The invention belongs to the field of semi-conductor thin films and particularly relates to a modified BiFeO3 (BFO) thin film photoelectrode adopting a cobaltous phosphate promoter and a preparation method thereof. The invention provides the modified BFO thin film photoelectrode adopting cobaltous phosphate (Co-Pi) and the preparation method thereof, the modified BFO thin film photoelectrode adopting the cobaltous phosphate (Co-Pi) and the preparation method thereof are characterized in that through the photo-assisted electrochemical deposition method, a Co-Pi promoter is deposited and loaded on the surface of a BFO thin film prepared through the sol-gel method. After the BFO thin film photoelectrode is modified through the cobaltous phosphate promoter, the reaction overpotential of the BFO thin film photoelectrode can be effectively reduced, surface reactivity is improved, and the problems that an existing BFO thin film photoelectrode is low in photo-generated carrier migration rate and high in carrier recombination rate are solved to some extent, so that the photoelectrochemical property of the BFO thin film photoelectrode is greatly improved, and application of the BFO thin film photoelectrode in the photoelectrochemical field is promoted.

The invention discloses a molybdenum disulfide nanosheet/porous graphitized biocarbon composite material and a preparation method and application thereof. The composite material takes porous graphitized biocarbon as a carrier, and the surface of the composite material is embedded with a molybdenum disulfide nanosheet. The preparation method comprises the following steps: preparing porous graphitized biochar powder; ultrasonic dispersing the porous graphitized biochar powder in water, adding sodium molybdate dihydrate and thioacetamide for hydrothermal reaction, centrifuging, washing and dryingto obtain the composite material. The composite material has the advantages of large specific surface area, good conductivity, low photogenerated electron-hole pair recombination rate, high photocatalytic activity, high universality and the like, and the preparation method has the advantages of simple process, simple and convenient operation and low cost, environmental protection, and no toxic and harmful by-products, suitability for large-scale preparation, and the method meets the requirement of actual production. The composite material can rapidly and efficiently treat antibiotics in the environment, and has good application value and application prospect.

The invention discloses a preparation method of a molecularly imprinted photo-electrochemical sensor based on N,S-CDs/CuPc composite material and an application in detection of ochratoxin A (OTA). Onthe basis of the synergistic effect of the co-doping of nitrogen and sulfur and non-covalent functionalization method, the energy level of the carbon point is adjusted correctly, the tight interface contact is optimized, the light absorption range is extended, and the charge transfer efficiency is enhanced to prepare the N,S-CDs/CuPc composite material; and then with combination of the molecular imprinting technology, a molecularly imprinted photo-electrochemical sensor is prepared successfully. According to the invention, the prepared sensor uses the composite material formed by N,S-CDs and CuPc as a photoelectric conversion layer; and the OTA detection is realized by surface modification of a molecularly imprinted membrane containing a toxin recognition site. The sensor has advantages ofwide detection range, high selectivity, and high sensitivity; the detection limit reaches up to 0.51pg.mL<-1>; and the sensor also has stable response and high reproducibility.

The invention discloses a photoelectrochemical aptamer sensor and a preparation method and application thereof. The sensor comprises a working electrode, the reaction end face of which is modified with a composite film, wherein the composite film is composed of a graphite phase carbon nitride nanosheet composite material jointly modified by gold nanoparticles/cerium dioxide quantum dots; and a specific aptamer probe is self-assembled on the surface of the composite film. The preparation method comprises the following steps: modification of CeO2QDs/Au/g-C3N4 and fixation of the specific aptamer probe. The photoelectrochemical aptamer sensor disclosed by the invention has the advantages of high stability, long service life, strong anti-interference capability, wide detection range, low detection limit and the like, can realize specific detection of target objects in media such as water bodies and organisms, and is high in utilization rate, high in use value and good in application prospect. The preparation method of the sensor has the advantages of simple process, convenience in operation, safety, low cost, no pollution, high manufacturing efficiency and the like, is suitable for large-scale preparation and is beneficial to industrial application.

The invention discloses a Pd/TOC photocatalyst, a Pd/CdS/TOC photocatalyst, a preparation method and an application thereof. The Pd/TOC photocatalyst is prepared by taking TOC as a load object and loading Pd on TOC. The Pd/CdS/TOC photocatalyst is prepared by further loading CdS on the basis of the Pd/TOC photocatalyst. Various photocatalysts prepared according to the invention are all green and environment-friendly materials; no new pollution is generated after degradation of the photocatalysts; degradation efficiency is high; applicable environment is extensive; the photocatalysts can be used for treating wastewater; the efficiency of degrading 2,4-dichlorophenol is high; the popularization and application of photocatalysts have huge advantages.

The invention provides preparation of porous sulfur-doped graphite phase carbon nitride-reduced graphene oxide nanosheets. The porous sulfur-doped graphite phase carbon nitride-reduced graphene oxidenanosheets are synthesized by combining supermolecular self-assembly with solvent thermal treatment under the condition of no other modifiers. The preparation mainly comprises the following process steps: 1, preparing a supermolecular precursor by hydrogen bond self-assembly; 2, roasting the precursor under a certain reaction condition to prepare stable and uniform graphite phase carbon nitride nanosheets; 3, performing solvent thermal treatment on dimethyl sulfoxide serving as a sulfur source and a solvent, graphene oxide and carbon nitride to prepare the porous sulfur-doped graphite phase carbon nitride-reduced graphene oxide nanosheets. The porous sulfur-doped graphite phase carbon nitride-reduced graphene oxide nanosheets are prepared by optimizing experiment conditions; the samples are stable in structure and high in photoelectrochemical property, and have wide application prospect in photocatalytic hydrogen production, carbon dioxide reduction and photocatalytic degradation of pollutants.

The invention discloses a double-electrode photoelectrochemical aptamer sensor as well as a preparation method and application thereof. The sensor comprises a first conductive glass electrode modified by a ternary composite material and used as a working electrode, a specific aptamer probe used as a counter electrode, and a second conductive glass electrode modified by reduced graphene oxide loaded with gold nanoparticles. The preparation method comprises the steps of preparing the working electrode and the counter electrode. The dual-electrode photoelectrochemical aptamer sensor has the advantages of high stability, long service life, strong anti-interference capability, high detection sensitivity, wide detection range, low detection limit and the like, can realize specific detection of pollutants (such as antibiotics) in media such as water bodies and organisms, and is high in utilization rate, high in use value and good in application prospect; and meanwhile, the preparation method has the advantages of simple process, convenience in operation, safety, low cost, no pollution, high preparation efficiency and the like, is suitable for large-scale preparation and is beneficial to industrial application.

The invention belongs to the technical field of photoelectrochemical sensing analysis and detection and food detection and sensing, and particularly relates to a molecular imprinting photoelectrochemical sensor based on an MIL-125-NH2/TiO2 composite material as well as a preparation method and application of the molecular imprinting photoelectrochemical sensor. The invention aims to solve the problems of complicated sample pretreatment steps, expensive instruments and equipment, need of operation of professional technicians and the like in the traditional oxytetracycline detection method, andthe technical problems of low photoelectrochemical sensing detection sensitivity, poor selectivity and the like. According to the invention, the defects of complex sample pretreatment process, expensive instrument, complex operation and the like in the existing oxytetracycline detection method based on chromatographic technology are mainly solved, and a simple, convenient, rapid, sensitive and reliable analysis and detection means is provided for detecting oxytetracycline in complex samples in the practical application process.

The invention belongs to the technical field of photoelectrochemistry, and particularly discloses a preparation method and application of a high-performance heterojunction material Fe2O3/CuO photoelectrode film, and the preparation method comprises the following steps: dissolving a ferric salt and sodium nitrate in deionized water, and growing precursor FeOOH on conductive glass (FTO) through a hydrothermal method; and taking out a precursor film, and calcining to obtain a n-Fe2O3 nano film; dissolving lactic acid and a copper salt in deionized water to enable the pH value to reach 10-12, andcentrifuging, drying and calcining a precipitate to obtain p-CuO powder; loading CuO on the Fe2O3 thin film by using an impregnation method, and finally calcining to obtain the Fe2O3/CuO heterojunction film. According to the Fe2O3/CuO photo-anode film prepared by the method disclosed by the invention, electron hole pairs can be effectively separated, and the recombination rate of electron holes isreduced, so that the photoelectrochemical performance can be effectively improved, and the purpose of efficiently decomposing water is achieved.

The invention belongs to the field of photoelectrochemical cathode protection, and particularly relates to a ZnIn2S4/TiO2 nano composite photoelectric material and a preparation method and application of the ZnIn2S4/TiO2 nano composite photoelectric material. Through a simple and convenient in-situ hydrothermal method, a three-dimensional nano flower ball ZnIn2S4/TiO2 nano grass cluster heterojunction photoelectrode with a fully contacted interface is constructed on a superfine highly branched TiO2 nano grass cluster substrate. Under simulated sunlight irradiation and under the condition that no extra hole scavenger exists, the composite material can achieve the photoelectrochemical cathode protection effect on pure copper and low-carbon steel with different self-corrosion potentials in seawater, and has the advantages of being simple in experimental operation, environmentally friendly and large in application potential.

Belonging to the field of photoelectric and photoelectrochemical films and application, the invention provides a graphite-phase carbon nitride film and a preparation method thereof. The preparation method includes the steps of: taking a nitrogen-rich organic matter as the precursor, subjecting the precursor to heat preservation at 350-400DEG C for 1-6h for primary pyrolysis polymerization, and grinding the obtained product into a powdery sample; spreading the powdery sample in a heat-resistant carrier, placing a substrate material at an opening of the heat-resistant carrier, then placing the heat-resistant carrier at 500-600DEG C, carrying out heat preservation for 2-8h, and conducting evaporation deposition polymerization, and performing cooling to obtain a graphite-phase carbon nitride film on the surface of the substrate material. The graphite-phase carbon nitride film prepared by the method is more uniform, and has lower surface roughness and better light transmittance. The methodprovided by the invention is simple and easy to operate, and has wide application prospects.