90results about How to "Lower oxidation potential" patented technology

The invention provides a lithium-ion battery electrolyte, which is composed of an organic solvent, lithium salt, a novel additive and other conventional additives. The novel additive is a dicyclophosphimide lithium salt or lithium dicyclothiophosphimide lithium salt compound shown in a structural formula 1. The compound shown in structural formula 1 of the invention has a high reduction potentialwhen used as an electrolyte additive, so that the novel additive can participate in the formation of a solid electrolyte film on the surface of a negative electrode in preference to the conventional additives and improve the composition of the interfacial film. Because the additive has a cyclic phosphate structure, the phosphorus-oxygen bond is easy to break under high voltage, and the additive can participate in the formation of a positive electrolyte film and improve the interface stability of the positive electrode material. Therefore, the introduction of the additive can improve the high temperature performance, low temperature performance and cycle performance of lithium-ion batteries.

The invention provides a lithium-ion battery electrolyte for a high-voltage ternary positive electrode material system. The lithium-ion battery electrolyte comprises a non-aqueous solvent, lithium hexafluorophate and a functional additive; the functional additive comprises a cyclic anhydride compound, a lithium salt type additive and methylene methanedisulfonate; the general structural formula of the cyclic anhydride compound is as shown in the description, wherein R1, R2, R3 and R4 are independently selected from any one of hydrogen atom, fluorine atom, or straight chain or branched chain alkyl with the number of carbon atoms of 1-4. The cyclic anhydride compound used in the lithium-ion battery electrolyte is higher in reduction potential (the reduction potential of succinic anhydride is 1.50 V vs Li+ / Li) on the negative electrode surface, so that other components in the electrolyte can be preferably reduced into films in the first charging process of the battery, the formed SEI film is high in stability. The cyclic anhydride compound used in the lithium-ion battery electrolyte is capable of effectively improving the cycle performance and high-temperature performance of the battery; and compared with fluoroethylene carbonate, the cyclic anhydride compound has excellent high-temperature performance as well as capability of improving the cycle performance.

The invention discloses an electrolyte and a lithium-ion battery using the same. The electrolyte comprises a non-aqueous solvent, a lithium salt and additives, wherein the additives comprise vinylenecarbonate, vinylethylene carbonate and fluoroethylene carbonate, and further comprises sulfonate and / or sulfate compounds containing silane functional groups, wherein the alkyl groups in the silane functional groups are independently selected from alkanes or olefins of which the number of carbon atoms is 1-3, or the alkanes or olefins of which the number of halogen-substituted carbon atoms is 1-3.The sulfonate or sulfate compounds can generate a dense and tough passivation film on the surface of a positive electrode material, effectively suppress the oxidation reaction in the system, and playa positive electrode protection role. And meanwhile, the compounds can synergize with other additives to form a dense and stable SEI film on the surface of a negative electrode, effectively prevent the reduction reaction of the electrolyte on the surface of the negative electrode and the deposition of transition metal, improve the interface between the negative electrode and the electrolyte, slowdown the secondary reaction of the electrode interface in a storage or circulation process, and further improve the battery performance.

The invention discloses a nitrite electrochemical sensor and a manufacturing method thereof. The nitrite electrochemical sensor is used for detecting the concentration of nitrite in a to-be-detected solution and comprises a substrate, wherein an auxiliary electrode, a working electrode, a reference electrode and leads and binding posts of the various electrodes are printed on the substrate by virtue of a silk-screen printing technology; the auxiliary electrode and the working electrode are subjected to carbon paste printing, while the reference electrode, the leads and the binding posts are subjected to silver / silver chloride paste printing; reduced graphene oxide is also deposited on the surface of the working electrode by virtue of an electrochemical graphene oxide reduction method, and a layer of Nafion is dispensed on the upper surface of the reduced graphene oxide. The sensor disclosed by the invention has the advantages of high sensitivity, short response time, good repeatability, low cost, disposability and the like, and has a good application potential in the aspect of on-site rapid detection of the content of nitrite in a to-be-detected sample.

The invention belongs to the technical field of electrochemical energy and relates to a polyhedral Pt-Pd alloy nano catalyst. The preparation method comprises the following steps: by taking octa-aminosilsesquioxane as a stabilizer and taking methanol as a reducing agent, preparing by virtue of a hydrothermal method to obtain the octahedral Pt-Pd alloy nano catalyst with consistent morphology and good dispersity. The polyhedral Pt-Pd alloy nano catalyst has the advantages that the active surface area is large, the catalytic activity is high, harsh conditions are not needed in the reaction, and the operation is simple and feasible. Moreover, the catalyst has huge application prospects in direct formic acid fuel cell anode catalysts.

The invention discloses a method for removing pentavalent antimony pollutant in water through an electrochemical method, and belongs to the technical field of water treatment. The method comprises the following steps: in an electrochemical reactor, serving an iron electrode as a positive electrode and serving a copper plate or a nickel plate as a negative electrode; adjusting a potential of hydrogen (pH) value of the to-be-processed water containing the pentavalent antimony pollutant to be 3-7, introducing the to-be-processed water into the electrochemical reactor, and adjusting the current density to be 10-30 amperes per square meter, the area of electrode plates and the size of the to-be-processed water to be 0.5-1 square meters / cubic meters, a space distance of the electrode plates to be 1-8cm, and electrochemical treatment time to be 10-40 minutes; and adopting a direct current power supply to supply power. The electrochemical method not only can effectively remove pentavalent antimony pollutant, but also can remove trivalent antimony pollutant.

The invention discloses a composite material-modified electrode used for measuring tyrosine concentration and application thereof. According to the invention, a metal nanometer modified electrode is prepared by using a current-time method at first; and then a polyaminobezenesolfonic acid film is deposited on the surface of the metal nanometer modified electrode by using cyclic voltammetry so as to prepare the polyaminobezenesolfonic acid / metal nanometer composite material-modified electrode which is applied to detection of tyrosine. Results show that the composite material-modified electrode has excellent electrocatalytic activity to tyrosine and has the characteristics of good sensitivity, high accuracy, good stability, etc.

The invention discloses a method for preparing a boron-doped diamond (BDD) film electrode for detecting dopamine (DA), characterized by using a sharp tip-shaped tungsten filament as a substrate, depositing a BDD film on the tungsten filament, activating the surface amino groups of the diamond film, then directly preparing a tyrosinase modification layer on the BDD film, wherein the tungsten filament is connected with a guide wire through a silver paste. The BDD film electrode is used as a biological probe, cyclic voltammetry is used to detect the DA content, and the concentration of DA in vivo can be detected in real time. According to the invention, the electrode prepared by the invention has good repeatability and electrochemical stability for detecting DA, has high sensitivity and strong selectivity, the modified BDD electrode can effectively separate oxidation peaks of DA and ascorbic acid (AA) in a solution containing AA that is many times DA and an ideal linear response relation is obtained in a wide range; the prepared electrode has extremely good anti pollution capability and long life, can not generate passivation pollution, and the needle-type electrode is beneficial for implanting operation of sensors in surgery.

The invention relates to an N,N'-di(triphenylamine group) fluorene diamine derivative with a general formula (I), wherein R1 and R2 refer to C1-C20 alkyl, phenyl or benzyl; and R1 and R2 can be same or different. The invention also relates to a method for preparing the compound, application of the compound as a hole injection layer material for an organic electroluminescent device and the organicelectroluminescent device containing the organic hole injection material. The compound is applied to an injection layer of the organic electroluminescent device so as to ensure excellent ohmic contact between the organic material and an electrode, bring convenience to the injection of the hole, improve the transmission efficiency of the hole, lower the driving voltage of the device, improve the efficiency of the device and prevent the thickness of the hole injection material from affecting the performance of the device.

The invention discloses a mono-dispersed Pd-Pt nano-catalyst and a preparation method therefor. According to the invention, with H2PtCl6.6H2O and PdCl2 as metal precursors, octa(amidocarboxyl silsesquioxane) as a protecting agent, and formaldehyde as a reducing agent, the mono-dispersed Pd-Pt nano-catalyst is prepared by a hydrothermal method. The prepared nano-catalyst has the advantages of good dispersing performance, higher electrochemical active specific surface area, and high electrocatalytic activity. The preparation provided by the invention is simple in required equipment and convenient in operation, and has great utilization value in a commercialization process of direct formic acid fuel cells.

The invention provides a device and a method for electrochemically preparing high-purity battery-grade lithium hydroxide. The device comprises two electrocatalytic electrodes and two separators, particularly an oxidation electrode (100), a hydrogen production electrode (200), an anion exchange membrane (300) and a cation exchange membrane (400); wherein the oxidation electrode (100) and the anionexchange membrane (300) form an anode tank; the hydrogen production electrode (200) and the cation exchange membrane (400) form a cathode tank; the device further comprises a lithium removal tank; thelithium removal tank is connected with the anode tank through the anion exchange membrane (300); and the lithium removal tank is also connected with the cathode tank through the cation exchange membrane (400). Compared with the prior art, the method and the device have the following technical effects: (1) electro-catalytic organic matter oxidation, electro-catalytic hydrogen evolution reduction and electro-lithium removal are combined for the first time; the whole system realizes simultaneous preparation of three products which are lithium hydroxide, hydrogen and acid.

The invention provides a non-aqueous electrolyte and a lithium ion battery. The non-aqueous electrolyte comprises a solvent, an electrolyte lithium salt and a functional additive, wherein the functional additive comprises 4,4'-dipinacol borate diphenyl sulfone, dipyridyl carbonate and lithium difluorophosphate. When the electrolyte provided by the invention is applied to a lithium ion battery of ahigh-nickel ternary material / graphite system, the impedance of the lithium ion battery can be remarkably reduced, the power performance of the lithium ion battery can be improved, gas production of the lithium ion battery in circulation and storage processes can be remarkably inhibited, and the rate capability, the normal-temperature cycle performance, the high-temperature cycle performance, thehigh-temperature storage performance and the safety performance of the lithium ion battery are remarkably improved.

The invention provides a long-life anode electrode material and a preparation method thereof, and relates to the fields of new materials, new energy and environmental protection, in particular to the technical fields of electro-oxidative degradation of pollutants, electrically-driven membrane pollution-resistant electrodes, hydrogen production through water electrolysis and hydrogen fuel cell electrodes in the environmental protection industry. According to the main technical scheme, the anode electrode material comprises a metal substrate, a transition layer and a noble metal functional coating; the transition layer is deposited on the substrate; the noble metal functional coating is deposited on the transition layer; the transition layer is made of corrosion-resistant and high-potential-resistant metal oxide; and the noble metal functional coating is one or more metals selected from ruthenium, iridium, platinum, gold and silver, and a certain amount of one or more non-noble metals selected from tin, antimony, lead, manganese, nickel, silicon, cobalt and zinc are doped in the noble metal coating. The invention mainly aims at improving the binding force of the electrode coating and the metal substrate, reducing the content of noble metal, improving the efficiency of an electrode and prolonging the service life of the electrode.

A composite material modified electrode used for gallic acid concentration determination is disclosed. A metal nanometer modified electrode is firstly prepared through cyclic voltammetry, then a poly(amino acid) film is deposited on the surface of the metal nanometer modified electrode through adopting cyclic voltammetry to prepare a poly(amino acid) / metal nanometer composite material modified electrode, and the prepared composite material modified electrode is used for gallic acid determination. The composite material modified electrode shows excellent electrocatalytic activity for gallic acid, has characteristics of high sensitivity, good accuracy and the like, is convenient and cheap, and has a wide application prospect.

The invention provides a diamine compound containing a diarylamine-pyrene structure, and a preparation method thereof, polyamide, polyimide and applications thereof, and belongs to the technical fieldof electronic control fluorescence. According to the invention, the diamine compound containing the diarylamine-pyrene structure is named di(4-aminophenyl)-di(4'-methoxyphenyl)-1,6-diaminopyrene, andhas a structure represented by a formula I; by combining diphenylamine and pyrene, a diarylamine-pyrene structure is constructed, and is a compound represented by the formula I; and in a material prepared from the compound, the electron donating group diphenylamine can be used as an auxochrome of pyrene to enhance the fluorescence intensity of the material, the twisted diphenylamine can weaken the accumulation effect, enhance the solubility and the solid state fluorescence of the material and accelerate the response speed of electronic control fluorescence, and by introducing an electron-donating methoxy substituent group into the para-position of diphenylamine, the oxidation potential can be effectively reduced, and the electrochemical stability is improved.

The invention discloses a menthol electro oxidation catalyst electrode, its process method and application, wherein the electrode relates to a metallization membrane modification electrode and is used as an electrochemical sensor for catalyzing menthol electro oxidation.A charged strong electron donating group polyaniline derivant poly-2,5-dimethoxybenzamine metallization membrane modification electrode comprises inert electrode base, conductive polymer membrane and catalyzer, wherein, polymer adhesion amount on the surface of base electrode is 0.3-1.0mgíñcm-2.The method comprises following steps: mixing PDMAn mixed with alcaine in N,N-dimethyl formamide or tetrahydrofuran to get 1.0í½10.0mg / mL liquor; coating liquor on electrode surface and drying it; changing coating times to adjust polymer adhesive materials; placing electrode in HCI liquor; conducting periodic scan or directional scan and changing times to get modification electrode with different platinum deposit rate.

The invention belongs to the field of a lithium ion battery material, and discloses an electrolyte additive and an electrolyte comprising the additive, and a lithium secondary battery. The electrolyteadditive is 4-methyl-N-tosyl benzene sulfonamide. A cyclic carbonate solvent and a linear carbonate solvent are mixed, and then are subjected to purification, impurity removal and dewatering, and a conductive lithium salt is added in the room temperature condition to obtain a common electrolyte; and next, an additive which accounts for 0.5-3.0% of the mass of the common electrolyte is added to the common electrolyte to obtain the final electrolyte. By taking 4-methyl-N-tosyl benzene sulfonamide as the additive of the lithium ion electrolyte, the cycle performance of the lithium secondary battery at a high pressure is improved.

The invention discloses a high-voltage electrolyte with a rapid charge function and a preparation method and application thereof, and belongs to the technical field of a lithium ion battery. The electrolyte is prepared by adding a functional additive in an amount equivalent to 1-5% of the mass of a conventional electrolyte into the conventional electrolyte, wherein the functional additive is difluoromethyl phenyl sulfone. The functional additive difluoromethyl phenyl sulfone can be used as a high-voltage and rapid-charge film formation additive; since the additive has relatively low oxidization potential, a compact and stable interface film can be formed on a surface of a positive electrode during the initial charge-discharge process, the surface membrane of the positive electrode is optimized, the surface activity of an electrode is prevented, so that further contact of the electrolyte and an electrode active substance and HF formation are prevented, and oxidization and decomposition of an electrolyte main solvent in the surface of the electrode are reduced; and the room-temperature cycle property and the rate performance of the lithium ion battery containing the functional additive are improved under 3-4.35V, and the lithium ion battery has favorable application prospect.

The invention relates to a thienyl-containing phosphite compound and an application thereof in a lithium ion battery electrolyte. The phosphite compound at least comprises one thiophene alkoxy C4H3(C2H4)nOS<->. The synthesis process of the phosphite compound is simple. The thienyl-containing phosphite compound is used for preparing a lithium ion battery electrolyte. Thienyl in the compound has thecharacteristic of being polymerized into a film at a positive electrode, trivalent P can react with O2 and HF in a battery to form a CEI film at the positive electrode, the formed polymer film contains a P element which is beneficial to the low-temperature performance of the battery, and the formed polymer film contains an S element which is beneficial to the high-temperature performance and thelow-temperature performance of the battery. The polymer film can stabilize the electrode structure, inhibit the dissolution of a transition metal, reduce the side reaction between the positive electrode and the electrolyte interface, and improve the electrochemical performance and safety performance of the battery.

The invention belongs to the technical field of ceramic ball products, and in particular discloses a far-infrared functional ceramic ball. Basic raw materials of the far-infrared functional water ceramic ball comprise kaoline and far-infrared functional water. The far-infrared functional ceramic ball has stronger effects of inhibiting the growth of bacteria and sterilizing, and has the functions of better removing hazardous substances, resisting the bacteria, removing odour, keeping fresh, promoting growth, preventing diseases, and the like, can effectively filter substances, odour, turbidness, colon bacillus, iodine and chlorine which have damage to a human body, can fully purify the water quality and obtain functional water beneficial to the human body health, and bring about technical innovation and breakthrough to the futural field of pure water. The invention also discloses a manufacturing method for the far-infrared functional ceramic ball, which specifically comprises the following steps: (1) selection of the basic raw materials; (2) ball milling; (3) sieving; (4) stock trough agitating; (5) spray drying; (6) forming; (7) baking; and (8) packaging. The whole manufacturing process is simple, convenient and easy; and the prepared far-infrared functional ceramic ball has strong hardness and good forming capability, and is not easy to destroy.

The invention relates to an electro-deposition display component and a preparation method thereof. The electro-deposition display component comprises a first electrode membrane, a second electrode membrane and a sealing frame, wherein the first electrode membrane and the second electrode membrane are arranged at interval, the sealing frame, the first electrode membrane and the second electrode membrane form an accommodating cavity in an enclosed manner, and the accommodating cavity is filled with electrolyte; the electrolyte comprises, by mass, 100 parts of organic solvent and 1-20 parts of bismuth salt. The electro-deposition display component has the advantages that the electrolyte uses the bismuth salt as the electrolyte to replace traditional silver salt, the bismuth salt is low in cost, good in stability under an illumination condition and low in oxidation potential and cannot be easily reduced and blackened as compared with the silver salt, needed voltage during the erasing of images on the electro-deposition display component is low, and the electro-deposition display component instability situation caused by the fact that anions in the electrolyte of the electro-deposition display component have anodic oxidation reaction with an organic solvent due to high voltage is reduced.

The invention discloses a method for rapidly dissolving copper. The method comprises the steps of adding solid copper to a copper dissolving tank through a copper material feeding inlet, wherein the material stacking thickness enables air to pass through smoothly; after the material is completely added, sealing the feeding inlet; starting a circulating pump, and adding a dissolving solution to thecopper dissolving tank 1 through a dissolving solution inlet; and starting heating equipment, heating the dissolving solution to 50-65 degrees centigrade, adding compressed air to the copper dissolving tank 1, adding an SO2 gas through an SO2 gas inlet, comprehensively adjusting reaction parameters, and dissolving copper rapidly to generate CuSO4. When the concentration of Cu<2+> in the solutionexceeds or is equal to 100 g / L, the reaction is stopped, Cu<2+> is discharged through a dissolving solution discharge port of the copper dissolving tank, the qualified copper sulfate solution is discharged through a dissolving solution outlet, and the exhaust gas is discharged through an air outlet. According to the method for rapidly dissolving copper disclosed by the invention, the copper dissolving rate is high, the utilization rate of oxygen in air reaches 80%, the inflated air amount is greatly reduced, the evaporation amount of the dissolving solution is reduced by about 30%, and the copper dissolving capacity can reach 800 kg / m<3>.d.

The invention discloses a non-aqueous electrolyte, a battery containing the non-aqueous electrolyte and an electric vehicle. The non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive containing dioxazole oxides, the electrolyte is applied to the battery, the additive has the good positive electrode film-forming property, the reaction between a positive electrode material and the organic electrolyte is effectively hindered and inhibited, the cycle performance of a positive electrode active substance at a high voltage of 4.4V is improved, and finally, the cycle life and the rate capability of the lithium ion battery are improved.

The invention discloses a carbon nanotube-modified electrode and a preparation method thereof. The preparation method comprises modifying a glassy carbon electrode (GCE) through carbon nanotubes (MWNTs) and zinc selenide quantum dots (ZnSe QDs), wherein the carbon nanotubes, zinc selenide quantum dots and glassy carbon electrode are pre-treated before modification, mixing the treated carbon nanotubes, zinc selenide quantum dots and Nafion solution, carrying out ultrasonic treatment to obtain a uniform black mixed solution, dip-coating the treated glassy carbon electrode with the mixed solution and drying the glassy carbon electrode through an infrared lamp to obtain a ZnSe QDs / MWNTs-Nafion / GCE-modified electrode. The carbon nanotube-modified electrode has good catalytic activity and high selectivity to an object to be detected, improves a response current signal, is simple, fast, nontoxic and environmentally friendly and builds a novel method for simultaneous determination of pyrocatechol, resorcinol and hydroquinone.

The invention provides a difunctional additive, an electrolyte containing the additive and a lithium-ion battery. The difunctional additive is 1,1-diethoxy-1-silicon heterocyclic penta-3-alkene and can participate in positive / negative film formation, improve interface compatibility between the electrolyte and a positive / negative pole and lower HF content of the electrolyte. The lithium-ion batteryelectrolyte, obtained through combined use of the difunctional additive, fluoroethylene carbonate and diphenyl sulfonyl methane, can effectively improve constant-temperature circulation performance of the lithium-ion battery with high energy density and relieve capacity attenuation of the lithium-ion battery, and meanwhile the high-temperature storage performance and the low-temperature performance of the lithium-ion battery can be further improved.

The invention relates to an electrochromic material and a preparation method thereof. The electrochromic material is prepared from a monomer 4,5-dioxyethylene indole in a boron trifluoride-ether system by an electrochemical polymerization method. The poly(4,5-dioxyethylene indole) material prepared by the preparation method has excellent electrochromic property, good thermal stability, relatively high electric conductivity and good flexibility and self-supporting property, and the preparation process is small in energy consumption.

The invention relates to a bimetallic PtSn / C catalyst for a high-activity fuel cell as well as preparation and application of the bimetallic PtSn / C catalyst. The preparation method specifically comprises the following steps of (a) adding Pt (acac)2 and CTAB (cetyltrimethyl ammonium bromide) into oleylamine, carrying out ultrasonic stirring, and then adding W(CO)6 and SnCl2. 2H2O to form a reactionsystem for heating reaction, so as to obtain a bimetal PtSn material; and (b) after the reaction system is cooled to room temperature, washing the bimetal PtSn obtained in the step (a), loading the bimetal PtSn on activated carbon, and carrying out aftertreatment to obtain the bimetal PtSn / C catalyst. Compared with the prior art, the prepared catalyst has high catalytic activity and good stability, can be used as a direct methanol fuel cell anode catalyst, and is simple in preparation process.

The invention provides a bithiophene pyrrolic compound containing diphenyl-4-phenylamine diphenyl diamine and preparation as well as a polymer and a preparation method and application, and relates to a thienyl pyrrolic compound and a preparation as well as the polymer prepared by utilizing the thienyl pyrrolic compound and the preparation method and the application of the polymer. The invention aims at solving the problem that a current existing electrochromic polymer is poor in film-forming property and single in color change. The structural formula of the compound is shown in the specification, and the method of the compound comprises the step of adding 2,5-bi(2-thiophene)-1,4-butanedione monomer, N,N'-diphenyl-N,N'-bi(4-phenylamine) diphenyl diamine and p-toluenesulfonic acid into methylbenzene for reaction, so as to obtain the compound. The structural formula of the polymer is shown in the specification, and the polymer is obtained by performing polymerization on the compound. The bithiophene pyrrolic compound containing the diphenyl-4-phenylamine diphenyl diamine is applied in an electrochromic material, a photoelectronic device or a biosensor. The invention can obtain the bithiophene pyrrolic polymer containing the diphenyl-4-phenylamine diphenyl diamine.

The invention provides a lithium-ion battery electrolyte for a high-voltage ternary positive electrode material system. The lithium-ion battery electrolyte comprises a non-aqueous solvent, lithium hexafluorophate and a functional additive; the functional additive comprises a cyclic anhydride compound, a lithium salt type additive and methylene methanedisulfonate; the general structural formula of the cyclic anhydride compound is as shown in the description, wherein R1, R2, R3 and R4 are independently selected from any one of hydrogen atom, fluorine atom, or straight chain or branched chain alkyl with the number of carbon atoms of 1-4. The cyclic anhydride compound used in the lithium-ion battery electrolyte is higher in reduction potential (the reduction potential of succinic anhydride is 1.50 V vs Li+ / Li) on the negative electrode surface, so that other components in the electrolyte can be preferably reduced into films in the first charging process of the battery, the formed SEI film is high in stability. The cyclic anhydride compound used in the lithium-ion battery electrolyte is capable of effectively improving the cycle performance and high-temperature performance of the battery; and compared with fluoroethylene carbonate, the cyclic anhydride compound has excellent high-temperature performance as well as capability of improving the cycle performance.

The invention provides a preparation method and application of an irradiation modified bismuth vanadate aptamer photoelectrochemical sensor. According to the invention, BiVO4 is subjected to infraredirradiation treatment, such that an external bias voltage-adjustable enhanced and inhibited sensor is realized for the first time. The characteristics of high sensitivity and high resolution are realized; meanwhile, the two sensors in the same system can detect tumor markers which are difficult to oxidize and easy to oxidize. The sensitivity of a PEC aptamer sensor designed by the invention is thesensor with the highest sensitivity at present, so that the sensor designed by the invention plays a greater role in PSA early accurate screening, prostate cancer treatment process and postoperativedynamic detection. Meanwhile, the sensor also has high-sensitivity detection characteristics on other cancer markers AFP and CEA. In addition, the two sensors designed by the invention have the advantages of quick response, simplicity in operation, low detected background signals and the like.