141 results about "Cyclic voltametry" patented technology

The invention relates to the technical field of air electrode preparation, in particular to a metal-loaded super-hydrophobic air electrode, a preparation method and chlorine production application, the air electrode comprises a high-hydrophobicity gas diffusion layer obtained through polytetrafluoroethylene modification, and the metal-loaded super-hydrophobic air electrode is prepared through a corona etching and electrochemical in-situ deposition technology. A uniform and highly-dispersed metal catalyst layer directly grows on the surface of the polytetrafluoroethylene substrate, so that the gas diffusion electrode with excellent mass transfer performance and an efficient catalytic function is obtained; the prepared electrode is used for carrying out electrochemical catalysis on a water body containing chloride ions by adopting a cyclic voltammetry method, and active chlorine can be efficiently generated in situ; the prepared metal-loaded super-hydrophobic air electrode has the advantages of being low in oxygen mass transfer resistance, high in catalyst utilization rate, free of generation of by-products, capable of efficiently generating active chlorine and the like, and has wide application potential in actual water environment disinfection.

The invention relates to a preparation technology of an electrochemical catalytic material, and aims to provide a method for preparing an electrode material through pulse electrodeposition and application of the electrode material in an oxygen evolution reaction. The method comprises the following steps: constructing a dual-electrode electrolysis system, and co-depositing transition metal ions and selenium ions on a working electrode by adopting a pulse electrodeposition method to form a catalyst layer containing transition metal and selenide; then the working electrode is used for building an electrochemical system, electrochemical activation treatment is conducted on the working electrode through cyclic voltammetry, a selenium phase is induced to fall off, porous metal oxide is formed by reconstructing the surface of a catalyst layer, and the electrode material for the water electrolysis oxygen evolution reaction is obtained. The selenium phase is induced to fall off through electrochemical activation to form a porous metal oxide structure, the specific surface area is remarkably increased, rich oxygen vacancies are formed, the electronic structure is optimized, more active sites are exposed, and the catalytic activity is improved; the method is easy to operate, high in parameter controllability, free of high-temperature and high-pressure equipment and suitable for large-scale production.

The invention discloses a rare earth element doped stainless steel oxygen evolution electrode and a preparation method thereof, and belongs to the technical field of electrode preparation. The preparation method of the stainless steel oxygen evolution electrode comprises the steps that stainless steel with impurities removed serves as an anode and is placed in an alkaline solution with the concentration being 7-12 mol / L, cyclic voltammetry is adopted, stainless steel treated through cyclic voltammetry is obtained, and the potential window is-0.3 V to 1.5 V; the stainless steel is placed in an alkaline solution with the concentration being 1-2 mol / L and serves as an anode for electrolysis, and anodic oxidation stainless steel is obtained; the anodic oxidation stainless steel is placed in a cerium ion solution, a cyclic voltammetry method is adopted, the stainless steel serves as an anode to be treated, and a stainless steel oxygen evolution electrode is obtained through electro-deposition; wherein the potential window is-1.5 V to 1.0 V (+ / -0.5 V). The preparation method is simple, the cost is low, large-scale preparation is easy, long-time, high-temperature and other complex preparation processes are not needed, and when the electrode is used as an electrode for electrolyzing oxygen evolution in water, the electrode has excellent catalytic activity and shows huge application prospects in large-scale industrial hydrogen production through water electrolysis.

The invention relates to the field of sensors, and discloses a solid electrolyte for ammonia gas detection, an electrochemical luminescence sensor, a preparation method and a detection method, and the solid electrolyte for ammonia gas detection comprises the following raw materials: a second electrolyte, a luminescent substance, an optional first electrolyte and an optional binder. The solid electrolyte for ammonia gas detection provided by the invention can realize ppb-level NH3 selective detection with high sensitivity, wide linear response range and low detection limit at room temperature for an electrochemical luminescence sensor for detecting ammonia gas. The electrochemical luminescence sensor for detecting the ammonia gas can be used for sensing the ammonia gas through a cyclic voltammetry method and a constant potential-luminescence technology, and ppb-level high-sensitivity and high-selectivity ammonia gas detection is realized.

The invention belongs to the field of electroanalytical chemistry / electrochemical sensors, and discloses preparation and application of a molecularly imprinted sensitive membrane modified electrode for perfluorooctane sulfonic acid detection. According to the method, aniline and o-fluoroaniline are selected as bifunctional monomers, PFOS is taken as a template molecule, in-situ electropolymerization is carried out through cyclic voltammetry, and the molecularly imprinted sensitive membrane capable of specifically recognizing PFOS is obtained. According to the invention, o-fluoroaniline is introduced and is combined with a fluorocarbon chain of PFOS through F-F interaction, and due to the existence of fluorine atoms, non-specific combination can be reduced, so that the anti-interference capability of the molecularly imprinted sensitive membrane is stronger, and the selective limitation on a perfluorinated compound composed of a sulfonic acid group and the fluorocarbon chain is reduced; according to the invention, aniline is used as another functional monomer, so that the conductivity can be improved, and the aniline and o-fluoroaniline can be doped and electrically polymerized to form fluorinated polyaniline. And the chemical property of the fluorinated polyaniline is relatively stable, so that the stability of the eluted molecularly imprinted cavity is relatively high.

The invention discloses preparation and application of a nickel selenide / ferronickel phosphate crystal / amorphous heterogeneous catalyst, and relates to the technical field of electrochemistry. Selenizing the foamed nickel at low temperature in an inert atmosphere to generate a crystalline NiSex layer in situ; and by taking the obtained electrode as a working electrode, carrying out electrodeposition in a deposition solution containing nickel salt, ferric salt, hypophosphite and acetate by adopting a cyclic voltammetry method, so that amorphous NiFePOy is deposited on the surface of NiSex, and a NiSex / NiFePOy crystal / amorphous heterostructure nanosheet layer is constructed and is used for an alkaline medium urea oxidation reaction. The invention has the following beneficial effects: crystalline / amorphous interface coupling and a nanosheet self-supporting structure synergistically improve active sites and charge transfer capability, reduce energy consumption and improve current output; meanwhile, the electrode stability and durability are enhanced; the method has the advantages of low material cost, mild and simple process, suitableness for amplified preparation, and application potential of urea-assisted water electrolysis energy-saving hydrogen production.

The invention discloses a ruthenium-loaded nickel-cobalt oxide heterostructure electrocatalyst and a preparation method thereof.The preparation method of the ruthenium-loaded nickel-cobalt oxide heterostructure electrocatalyst comprises the steps that nickel nitrate hexahydrate, cobalt nitrate hexahydrate, ammonium fluoride and urea are dissolved in deionized water and stirred for 30 min, the mixture and carbon cloth are subjected to a hydrothermal reaction, cleaning, drying and calcination are conducted, and the ruthenium-loaded nickel-cobalt oxide heterostructure electrocatalyst is obtained; forming a second intermediate product; ruCl3.xH2O and KCl are added into H2O, magnetic stirring is conducted for 30 min, and a second process solution is obtained; and performing electrochemical deposition of ruthenium on the second intermediate product through cyclic voltammetry to obtain a third intermediate product, and drying the third intermediate product to obtain the ruthenium-loaded nickel-cobalt oxide heterostructure electrocatalyst. According to the preparation method of the ruthenium-loaded nickel-cobalt oxide heterostructure electrocatalyst provided by the embodiment of the invention, the proportion of ruthenium in the product is more easily regulated and controlled, so that the optimal nitrate electrocatalysis reduction performance is obtained.

The invention belongs to the technical field of photo-thermal evaporation materials, and discloses a composite photo-thermal material Fe / PANI / GF and a preparation method and application thereof. The preparation method of the composite photo-thermal material Fe / PANI / GF comprises the following steps: taking graphite felt (GF), and activating at high temperature to obtain activated graphite felt; uniformly depositing polyaniline on the surface of the activated graphite felt by adopting a constant current method or a cyclic voltammetry to obtain acid-doped polyaniline (PANIES / GF); and dipping the acid-doped polyaniline in a ferric salt solution or a ferrous salt solution, and dispersing and loading Fe on the PANI nano-particle layer through Fe-N coordination to obtain the composite photo-thermal material Fe / PANI / GF. The method shows wide application prospects in the fields of seawater desalination, high-salinity wastewater treatment, heat-assisted power generation, photo-thermal driven sterilization, soil remediation and the like, and an innovative scheme is provided for solving the problems that a traditional photo-thermal material is low in efficiency, poor in stability, high in cost and the like.

The present invention discloses a phosphate detection method using a colorimetric method and electrochemical test paper, which belongs to the field of environmental monitoring. Specifically, the phosphate content in the water body is first semi-quantitatively detected by standard colorimetric test paper, and then the electrochemical test paper with a paper base is used to select cyclic voltammetry or square wave pulse voltammetry according to the colorimetric result to detect the phosphate concentration in the water body; when the phosphate content calculated as phosphorus in the colorimetric result is higher than 5 mg / L, the water sample is diluted by half and then detected by cyclic voltammetry; when the phosphate content calculated as phosphorus in the colorimetric result is within the range of 0.5 to 5 mg / L, cyclic voltammetry is used for detection; when the phosphate content calculated as phosphorus in the colorimetric result is lower than 0.5 mg / L, square wave pulse voltammetry is used for detection. The detection process of the present invention does not require the addition of other reagents, has a wide and accurate detection concentration range, and can achieve simple and fast in-situ detection of phosphate.

The invention belongs to the technical field of electrochromic polymers, and particularly relates to an electrochromic polymer, a film and a preparation method of the film. The preparation monomer of the electrochromic polymer is 2-(heptan-3-yl)-4, 7-bis (thieno [3, 2-b] thiophen-2-yl) benzo [d] thiazole, the monomer can be directly synthesized through the reaction of 4, 7-dibromo-2-(heptane-3-yl) benzothiazole and (thieno [3, 2-B] thiophene-2-yl) tributyltin, and the steps are simple and convenient. The polymer is yellow in a neutral state and blue in an oxidation state, coloring only needs 0.25 s, fading only needs 0.61 s, and the electrochromic response speed is high. The electrochromic polymer is prepared through a cyclic voltammetry method, and the generated polymer naturally deposits and grows on the surface of an ITO glass electrode and has a film form, so that the preparation steps of an electrochromic film are simplified, and the adhesive force between the film and a transparent conductive substrate is remarkably improved.

A method of coating a metallic substrate includes immersing a metallic substrate in a polymer composition including a conductive 3,4-ethylene dioxythiophene (EDOT) polymer, a gelatin polyelectrolyte, an antibacterial drug, an organic solvent, and an inorganic salt solute, and further coating the polymer composition onto a surface of the metallic substrate by cyclic voltammetry to form a coating on the surface of the metallic substrate. The coating on the metallic substrate is performed such that the gelatin and the antibacterial drug are uniformly distributed throughout the coating, and the coating has a thickness between 7.0 and 15.0 micrometers. The metallic substrate is a stainless steel (SS). An implantable medical device including a metallic substrate coated by the present method.

The invention provides an electrode for detecting protein substances, a preparation method of the electrode, a biosensor and a microflow detector. The electrode comprises a carbon electrode, a Prussian blue layer and a gold nanoparticle layer which are stacked in sequence, the side, away from the Prussian blue layer, of the gold nanoparticle layer is modified with an aptamer, the particle size of gold nanoparticles of the gold nanoparticle layer ranges from 20 nm to 100 nm, and the mass of the gold nanoparticles on the Prussian blue layer per unit area ranges from 4 micrograms / cm < 2 > to 5 micrograms / cm < 2 >; the Prussian blue layer is formed on one side of the carbon electrode by adopting a cyclic voltammetry method, the cyclic voltammetry method adopts a three-electrode system to perform continuous scanning for 20-40 circles in a potential range of-0.2 V-0. 9V, an electrolyte comprises 5-25 mM of potassium ferricyanide, 5-25 mM of ferric chloride, 0.12-0.25 M of hydrochloric acid, 5-50 mM of potassium chloride and the balance of water, and the molar ratio of the potassium ferricyanide to the ferric chloride is 1: 1. The electrode has more excellent sensitivity and stability, and detection of pg / mL-magnitude ultralow-concentration protein substances is realized.

This invention belongs to the field of electrochemical testing technology and discloses a dual-plate portable electrochemical testing system, including an upper plate, a lower plate, an electrochemical biosensor electrode converter, and a mobile terminal APP. The invention adopts an upper and lower plate structure, separating the data programming surface and the sensor interface surface, facilitating the replacement and upgrading of computing resources and the analog front-end separately. The invention hierarchically lays out the three-electrode interface analog circuit and the communication control circuit, and separates the power supply for digital and analog power supplies, which helps reduce mutual interference between the sensor's analog signal lines and digital communication signal lines, improving the stability of electrochemical testing. This invention enables wireless interaction via a mobile terminal and can be portablely powered by an external terminal device, offering flexible usage and facilitating on-site deployment and mobile testing. This invention supports multiple testing modes, including cyclic voltammetry, chronoamperometry, and differential pulse voltammetry, adapting to different electrochemical testing needs.

The present invention relates to a nano-polyaniline / Prussian blue electrode for detecting biomarkers in exhaled breath, a preparation method, an apparatus and a method thereof. The preparation method comprises the following steps: providing an AAO template and an electrode body, fixing the AAO template on the electrode body to obtain an assembly; immersing the assembly in an acid solution of aniline, and performing a first electrodeposition thereof using cyclic voltammetry to obtain an intermediate assembly; wherein the concentration of aniline in the acid solution is 10-50 mg / mL; placing the intermediate assembly in an alkaline solution, and obtaining a nano-polyaniline electrode after the AAO template is completely dissolved; immersing the nano-polyaniline electrode in an aqueous solution containing Fe 3+ and Fe(CN)6 3‑ The nano-polyaniline / Prussian blue electrode is prepared by performing a second electrodeposition on the nano-polyaniline / Prussian blue electrode using cyclic voltammetry, taking out the nano-polyaniline / Prussian blue electrode, and washing and drying the nano-polyaniline / Prussian blue electrode.

The invention belongs to the technical field of electrochemistry, and relates to a preparation method of a self-leaching / assembled nickel-tungsten alloy composite material, which comprises the following steps: preparing nickel nitrate hexahydrate, ammonium metatungstate and deionized water into a solution, transferring the solution and a pretreated base material into a stainless steel autoclave with a Teflon lining, carrying out hydrothermal reaction, and cleaning to obtain a nano precursor NiWO-Sub; carrying out reduction heat treatment under the protection of a hydrogen-containing atmosphere to obtain a tungsten composite precursor Ni-WO-Comp; and performing electrochemical activation treatment by adopting a cyclic voltammetry method. Through a self-leaching-assembling strategy, controllable leaching of a tungsten element and in-situ optimized assembling of a material structure are achieved in the electrochemical activation process, the formed amorphous WOx and W-doped NiW alloy composite structure is balanced under the high-concentration W leaching effect, continuous tungsten leaching in an industrial-grade electrolyzed water environment is effectively inhibited, and the yield of the tungsten-doped WOx and W-doped NiW alloy composite structure is improved. And the long-term catalytic stability of the nickel-tungsten alloy electrode is obviously improved. And the preparation process is simple and easy to implement, can be attached to various different substrates, and is easy to implement industrially.

The invention discloses a membrane electrode activation method, device and equipment and a fuel cell, accumulative calculation is carried out according to an ECSA integral calculation formula in a preset time period, the active area of a to-be-detected membrane electrode activated by cyclic voltammetry is judged to be larger than a preset active area, after an electrochemical workstation is dismounted, the to-be-detected membrane electrode is connected with a load, and the to-be-detected membrane electrode is activated. And after the cathode gas of the membrane electrode to be detected is switched into air and the anode gas is switched into hydrogen, performing high-frequency variable-current activation until the battery voltage is stabilized at a preset voltage value under the preset current density. According to the method, the cyclic voltammetry is firstly adopted for activation, impurities on active sites of a catalyst layer covering the surface of the membrane electrode can be removed, humidification gas is accelerated to enter the catalyst layer, the active area of the membrane electrode to be detected is larger than the preset active area, then high-frequency variable-current activation is carried out, and an electron and proton mass transfer channel can be rapidly constructed; therefore, efficient establishment of a reaction three-phase interface is realized, the activation time is shortened, and the activation efficiency is improved.

This invention discloses a method for increasing the hydrophilicity of titanium / titanium alloy dental implants using an electrochemical approach, comprising the following steps: S1, pretreating the titanium / titanium alloy dental implant to obtain a pretreated titanium / titanium alloy dental implant; S2, sandblasting and drying the pretreated titanium / titanium alloy dental implant obtained in S1 to obtain a treated titanium / titanium alloy dental implant; S3, acid etching the treated titanium / titanium alloy dental implant obtained in S2 to obtain an acid-etched titanium / titanium alloy dental implant; S4, electrochemical activation treatment to obtain an activated titanium / titanium alloy dental implant; S5, continuously rinsing the activated titanium / titanium alloy dental implant obtained in S4 with purified water for 20 seconds and drying it in a vacuum drying oven. This invention uses cyclic voltammetry (CV) electrochemically to activate the titanium / titanium alloy implant, thereby enhancing its hydrophilicity.

The application belongs to the technical field of preparation of electrocatalytic hydrogen evolution catalysts, and discloses a preparation method of an electrocatalytic hydrogen evolution catalyst Pt / GaN. First, gallium nitride nanoparticles are loaded on the surface of an electrode, and then, through cyclic voltammetry, platinum is uniformly electrodeposited on the surface of the gallium nitride from an electrolyte containing chloroplatinic acid to prepare the catalyst Pt / GaN. The mass percentage of Pt in the catalyst is only 2.2-5.4%, which greatly improves the catalytic activity of the catalyst while reducing the Pt loading. From the entire preparation process, the application breaks through the limitation that the traditional platinum loading method cannot accurately control the particle size growth. The particle size of Pt in the catalyst is between 2-5 nm. On the other hand, the method has the advantages of easy availability of raw materials and environmental protection without pollution.

This invention discloses a copper hexacyanoferrate-potassium heptacopper sulfide composite electrode material, its preparation method, and its application, belonging to the field of electroanalytical sensing material preparation technology. This invention uses a hydrothermal synthesis method to prepare potassium heptacopper sulfide. Subsequently, the potassium heptacopper sulfide-modified electrode is placed in an electrolyte solution containing potassium ferricyanide, and in-situ electrosynthesis is performed using cyclic voltammetry. This allows the hexacyanoferrate ions and copper ions present in the electrolyte to react and generate water-insoluble copper hexacyanoferrate, which grows in situ on the electrode surface, resulting in the copper hexacyanoferrate-potassium heptacopper sulfide composite electrode material. In this material, potassium heptacopper sulfide serves as a conductive substrate, and copper hexacyanoferrate serves as a redox probe. This composite electrode material can be used to construct an electrochemical sensor containing a molecularly imprinted layer, which exhibits high sensitivity, high specificity, a wide detection range, and good stability.

To provide a laminate capable of obtaining a perovskite solar cell having excellent output characteristics.SOLUTION: In the solar battery including a light-transmitting electrode layer, an electron transport layer, a perovskite layer, a hole transport layer, and a collector layer, the light-transmitting electrode layer and the electron transport layer are stacked, the light-transmitting electrode layer includes a conductive member, the electron transport layer includes a tin oxide layer, and the tin oxide layer has a thickness of 5.0 nm or more and 80.0 nm or less and satisfies Condition A. Condition A: A peak current and a peak potential of an anode peak appearing in a first cyclic voltammogram obtained by performing cyclic voltammetry on a conductive member whose surface is not covered are defined as a current value A and a potential V, respectively. A current value at potential V in a second cyclic voltammogram obtained by subjecting the stack to cyclic voltammetry is defined as a current value B. At this time, the coverage ratio calculated by Formula (1) (coverage ratio (%) = (1-B / A) * 100) is 90% or more.SELECTED DRAWING: Figure 2

The application discloses a modified anode for a marine sediment microbial fuel cell and a preparation method of the modified anode and the marine sediment microbial fuel cell, and the preparation method comprises the following steps: S1, obtaining a primary anode; S2, nitrogen is introduced into a first PBS buffer solution to perform nitrogen exposure treatment, and dopamine hydrochloride is added to obtain a first electrolyte; S3, the primary anode is immersed into the first electrolyte, and electro-deposition is performed on the primary anode by a first cyclic voltammetry scanning method to obtain a PDA modified anode; S4, Fe3O4 powder is added into a second PBS buffer solution to obtain a second electrolyte; and S5, the PDA modified anode is immersed into the second electrolyte, and electro-deposition is performed on the PDA modified anode by a second cyclic voltammetry scanning method to obtain a PDA / Fe3O4 modified anode. The PDA / Fe3O4 composite is used to modify the anode, the electrochemical performance of the anode is improved, and a proper amount of amino acid is added into the sediment, so that the organic matter conversion and electron transmission efficiency of the microbial fuel cell are improved, and the electricity generation performance of the microbial fuel cell is improved.

The invention relates to the technical field of electrochemical analysis, in particular to an electrochemical sensor for detecting fisetin and an electrochemical method.The electrochemical sensor comprises a working electrode, the working electrode is Nafion-AuNPs / CFME, the Nafion-AuNPs / CFME comprises CFME, a Nafion layer and an AuNPs layer, and the Nafion layer and the AuNPs layer are sequentially modified on the surface of the CFME; the electrochemical sensor is adopted, a to-be-detected sample is detected through cyclic voltammetry or differential pulse voltammetry, response current is recorded, and then the concentration of fisetin in the to-be-detected sample is calculated according to a concentration-current linear regression equation. According to the electrochemical sensor, Nafion-AuNPs / CFME is adopted as a working electrode, the modification effect of AuNPs on the surface of CFME is enhanced through Nafion, and high-sensitivity, high-selectivity and wide-concentration-range detection of fisetin can be achieved.

The invention concerns the development of molecularly imprinted polymer for label-free capacitive sensing application. The method outlined by the invention involves several steps: a) Pre-treating the surface of the working electrode; b) Electrochemical polymerizing a monomer solution in an electrolyte buffer containing the target template molecule to form an imprinting template film on the electrode surface; c) Washing the electrode to remove unbound molecules; d) Characterizing the formed imprinting template film by cyclic voltammetry in a supporting electrolyte solution to determine its half-wave potential; e) Forming the molecularly imprinted polymer electrode by removing the target template molecule from the synthesized polymer; f) Incubating the obtained molecularly imprinted polymer with the target template for a specified duration; g) Detecting the target template molecule using capacitance-derived electrochemical impedance spectroscopy. This method presents significant advantages in terms of specificity, sensitivity, and stability, rendering it highly applicable across numerous industries for enhancing detection, monitoring, and diagnostic capabilities.

This invention discloses a method for detecting adiponectin in human serum using a polydopamine-modified wire mesh carbon electrode, specifically relating to the field of adiponectin detection technology. The method involves preparing a 2 mg / mL dopamine hydrochloride solution using a 10 mM tris(hydroxymethyl)aminomethane hydrochloride buffer solution (pH=8.5) and adding it dropwise onto the surface of the working electrode. A polydopamine-modified layer is formed by electropolymerization within a range of -800 mV to 600 mV using cyclic voltammetry. A conductive layer of a poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid complex is then coated. Adiponectin antibodies are then immobilized on the surface of the modified layer via covalent binding of amino and quinone groups. After specific binding with a serum sample, the oxidation peak current change is read out from -100 mV to 350 mV in a buffer detection medium containing 5 mM ferricyanide redox pairs, and the concentration is output from a standard curve. This method improves the density of antibody immobilization sites and inhibits non-specific serum adsorption, enhancing signal stability and sensitivity, and enabling rapid, low-cost quantitative detection of trace amounts of serum.

The application discloses a cluster type self-healing nickel oxyhydroxide / iron-nickel electrode and application thereof in hydrogen production by cracking of saline water, and steps are as follows: under a three-electrode system, a foam metal is used as a working electrode, a cyclic voltammetry method is adopted in a potassium hydroxide solution electrolyte, and a metal cluster dispersion liquid is obtained; under the three-electrode system, a nickel iron / nickel MOF is used as the working electrode, the metal cluster dispersion liquid is used as the electrolyte, the cyclic voltammetry method is adopted, and a target electrode is obtained; and the target electrode is used in hydrogen production by cracking of saline water or a whole reaction of cracking of saline water in the electrolyte obtained by mixing the metal cluster dispersion liquid and the saline water. The target electrode has higher activity and durability and good self-healing performance under the saline water and industrial large current density (500 mA cm ‑2 ).

An embodiment of the present invention is for stably restoring a layered structure when regenerating a positive electrode active material that has degraded due to lithium and nickel deficiency, and provides a direct recycling method of a positive electrode active material and the positive electrode active material regenerated thereby. The direct recycling method comprises the steps of: preparing a positive electrode including a waste positive electrode active material recovered from a waste lithium-ion battery; electrochemically plating nickel on the surface of the positive electrode through cyclic voltammetry; recovering a nickel-plated positive electrode active material from the nickel-plated positive electrode; and obtaining a regenerated positive electrode active material by heat-treating the nickel-plated positive electrode active material.

The invention relates to a method for electrochemically detecting chloramphenicol by using molecular imprinting. The method is characterized in that a chloramphenicol molecularly imprinted polymer prepared from a temperature-sensitive monomer N-isopropylacrylamide and Dawson type tungsten phosphate (P2W18) are jointly modified on a substrate electrode through a simple and controllable electrostatic layer-by-layer self-assembly method. The modified electrode synthesized by the method disclosed by the invention is used as a working electrode, a saturated calomel electrode is used as a reference electrode, a platinum electrode is used as an auxiliary electrode, and the electrochemical sensing performance of the modified electrode on chloramphenicol is respectively evaluated by cyclic voltammetry, differential pulse voltammetry and square wave voltammetry. According to the modified electrode, the sensitivity of an electrochemical signal is synergistically enhanced through the high-selectivity imprinting cavity of the molecularly imprinted polymer and the rapid and reversible oxidation-reduction activity of P2W18, the detection linear range of chloramphenicol is 0.1 nM to 10 [mu] M, and the detection limit of differential pulse voltammetry is as low as 0.145 nM; and a good application prospect is provided for preparing a uniform and controllable molecularly imprinted polymer composite modified electrode material in the future. At present, an indissolvable molecularly imprinted polymer material is integrated into an electrochemical sensor through an electrostatic layer-by-layer self-assembly technology, so that the research on improving the selectivity of chloramphenicol detection and reducing the detection limit is rarely reported.

The application discloses a battery positive electrode material and a preparation method and application thereof, and belongs to the technical field of battery materials. The battery positive electrode material is an aluminum-cobalt-nickel three-metal hydroxyl oxide, and the molar ratio of aluminum elements, cobalt elements and nickel elements in the hydroxyl oxide is x:y:z in terms of atomic number, wherein the sum of x, y and z is 1, 0.05<=x<=0.15, and 0.25<=y<=0.35. The preparation method comprises the following steps: dissolving aluminum salt, cobalt salt and nickel salt in deionized water to prepare a metal salt solution, then adding an alkali solution, and reacting to generate a precipitate; washing and drying the obtained precipitate to obtain a precursor powder; preparing a slurry from the precursor powder, coating the slurry on a substrate, and drying to obtain a precursor electrode sheet; and oxidizing the precursor electrode sheet in a three-electrode system by a cyclic voltammetry method to obtain the battery positive electrode material. The battery positive electrode material has a high energy density as a water-based magnesium ion battery positive electrode, and solves the current situation that the energy density of a water-based magnesium ion battery positive electrode is low.

The application develops an application of an electrochemical sensor in metronidazole antibiotic detection, the electrochemical sensor is that graphene oxide nanosheet is placed in a mixed solution of ultrapure water-ethanol, pH value is adjusted to 1-5, ultrasonic is obtained, and a protonated graphene oxide colloidal solution is obtained; platinum chlorate is put into the protonated graphene oxide colloidal solution, and [PtCl6] 2‑ -GO colloidal is prepared after ultrasonic at 2-5 DEG C; [PtCl6] 2‑ -GO colloidal is dropped on the surface of a pretreated electrode, then the electrode is dried, the electrode is placed in a PBS buffer solution after drying, and the electrochemical sensor is obtained by cyclic voltammetry scanning; the electrochemical sensor has high sensitivity, low detection limit and can selectively recognize metronidazole.

The invention relates to the technical field of nano catalysts, in particular to a preparation method of an electrostatic confinement diatomic flexible membrane electrode, which comprises the following steps: S1, preparing an integrated flexible substrate material, and carrying out oxidation treatment for later use; s2, the surface of the oxidized substrate material is subjected to functionalization treatment, and an organic adsorption layer is electroplated on the surface of the substrate through cyclic voltammetry and used for anchoring a double-atomic cluster; s3, preparing a solution containing double atomic clusters, and enabling the double atomic clusters to be uniformly adsorbed on the surface of the functionalized substrate by utilizing electrostatic interaction; and S4, drying the substrate adsorbing the double-atom cluster, and carrying out calcination pyrolysis treatment in a protective atmosphere to prepare the double-atom flexible membrane electrode. According to the invention, through anion and cation adsorption, double atomic clusters are formed by utilizing positive and negative charge attraction of porphyrin iron and cobalt cyanide ions, and the double atomic clusters are embedded into a polypyrrole modified SWCNT film, so that multistage structure integration of active sites, a conductive substrate and a mass transfer channel is realized.