1943 results about "Working electrode" patented technology

Methods and analyte sensors including at least a first working electrode having a first active area thereon, and performing a dip coating operation to deposit a bilayer membrane upon the first working electrode and the first active area. The bilayer may include an inner layer having a first membrane polymer and an outer layer having a second membrane polymer, the first membrane polymer and the second membrane polymer differing from one another. The dip coating operation may comprise one or more first dips in a first membrane formulation to form the inner layer of the bilayer membrane and one or more second dips in a second membrane formulation to form the outer layer of the bilayer membrane upon the inner layer.

Methods and analyte sensors including at least a first working electrode having a first active area thereon, and performing a dip coating operation to deposit a bilayer membrane upon the first working electrode and the first active area. The bilayer may include an inner layer having a first membrane polymer and an outer layer having a second membrane polymer, the first membrane polymer and the second membrane polymer differing from one another. The dip coating operation may comprise one or more first dips in a first membrane formulation to form the inner layer of the bilayer membrane and one or more second dips in a second membrane formulation to form the outer layer of the bilayer membrane upon the inner layer.

Methods and analyte sensors including at least a first working electrode having a first active area thereon, and performing a dip coating operation to deposit a bilayer membrane upon the first working electrode and the first active area. The bilayer may include an inner layer having a first membrane polymer and an outer layer having a second membrane polymer, the first membrane polymer and the second membrane polymer differing from one another. The dip coating operation may comprise one or more first dips in a first membrane formulation to form the inner layer of the bilayer membrane and one or more second dips in a second membrane formulation to form the outer layer of the bilayer membrane upon the inner layer.

Methods and analyte sensors including at least a first working electrode having a first active area thereon, and performing a dip coating operation to deposit a bilayer membrane upon the first working electrode and the first active area. The bilayer may include an inner layer having a first membrane polymer and an outer layer having a second membrane polymer, the first membrane polymer and the second membrane polymer differing from one another. The dip coating operation may comprise one or more first dips in a first membrane formulation to form the inner layer of the bilayer membrane and one or more second dips in a second membrane formulation to form the outer layer of the bilayer membrane upon the inner layer.

The invention discloses an electrochemical sensor constructed based on a composite material and a preparation method and application thereof.The electrochemical sensor comprises a screen-printed electrode, the surface of the reaction end of a working electrode of the screen-printed electrode is loaded with a zirconium-based metal organic framework composite material, the composite material comprises UiO-66, and the surface of the composite material is modified with a polydopamine coating. The preparation method comprises the following steps: preparing the zirconium-based metal organic framework composite material and fixing the composite material on the working electrode of the screen-printed electrode. According to the invention, the zirconium-based metal organic framework composite material with many adsorption sites, good dispersibility, good conductivity and good hydrophilicity is used as a functional material, so that the sensor has the advantages of simple operation, low cost, rapid response, strong anti-interference capability, wide detection linear range, high detection sensitivity, long service life and the like, and can be widely used for detecting Mn < 2 + >, Mn < 2 + >, Mn < 2 + >, Mn < 2 + > and Mn < 2 + > in a water body. The method can realize rapid and accurate detection of Mn < 2 + > in a water body, and is high in use value and good in application prospect.

The invention discloses a potassium ion sensor based on AuNPs / MXene / SPCE and a preparation method thereof, and belongs to the technical field of electronic components. Comprising a screen-printed carbon electrode SPCE, an MXene layer modified on the surface of a working electrode of the screen-printed carbon electrode, a gold nanoparticle AuNPs layer formed on the surface of the MXene layer through an electrochemical deposition method, a potassium ion selective membrane covering the gold nanoparticle AuNPs layer, and a GO-PVA hydrogel layer coating the surface of the potassium ion selective membrane. According to the prepared sensor, only potassium ions in sweat can pass through the selective membrane, the selectivity of the sensor is improved, meanwhile, due to the application of the AuNPs / MXene composite material, the surface area-volume ratio of a silk-screen printing carbon electrode is greatly improved, more potassium ions participate in ion-electron conversion, the sensitivity of the sensor is improved, and the application range of the sensor is widened. And the detection range is expanded.

The invention discloses a preparation method of a bionic cornea stroma lens for refractive correction, which comprises the following steps: solution preparation: dissolving type I collagen in an acetic acid solution, adding a film aid, fully stirring, and centrifugally defoaming to obtain a type I collagen composite solution; the I-type collagen composite solution is poured into an assembling groove, the curvature radius of titanium metal is set to be 6.8-8.0 mm, the titanium metal serves as a working electrode material, platinum metal serves as a counter electrode material, current parameters are set according to the needed thickness of the lens blank, the density is 3.50-6.50 mA / cm < 2 >, and the thickness of the lens blank is set to be 3.50-6.50 mA / cm < 2 >; a high-transparency cornea embryo material which is uniform in curvature in all directions and similar to human cornea fiber structure arrangement is formed after electrochemical assembly and cross-linking curing, accurate cutting machining is carried out through excimer laser, a concave / convex matrix lens with the needed correction degree is obtained, the correction precision is high after cornea interlayer implantation, and the correction precision is high. And meanwhile, the compound has excellent performance in the aspects of in-vivo stability and biological safety.

The invention provides a preparation method of a nickel-based composite oxygen evolution anode for alkalescent electrolyte. According to the invention, nickel-based alloy is used as substrates, two same substrates are respectively used as a working electrode and an auxiliary electrode, two-electrode system electrochemical oxidation reduction treatment at room temperature is carried out in a mixed solution of phosphate, carbonate and chloride, and two reconstructed nickel-based composite oxygen evolution electrodes are obtained at the same time. In the electrochemical oxidation process, nickel ions and other metal (Fe, Co, Cr and Mn) ions are dissolved out from the nickel-based alloy under the etching assistance of chloride ions; in the electrochemical reduction process, water on the electrode is reduced to form hydroxyl. Under continuous oxidation reduction, substance reconstruction is carried out to generate a composite catalyst layer of phosphate, carbonate and hydroxide of nickel and other metals, so that not only can the oxygen evolution activity be improved, but also metal dissolution and corrosion passivation when the catalyst is used in a weakly alkaline solution can be inhibited, and the durability of the electrode is greatly improved.

The invention relates to the technical field of electrochemical sensors, and provides a multi-channel electrochemical detection electrode, an electrochemical sensor and a detection method.The multi-channel electrochemical detection electrode comprises an electrode substrate and a plurality of working electrodes arranged on the electrode substrate; the surfaces of the plurality of working electrodes are respectively modified with different types of metal nano-catalysts to detect different gas components, and the surfaces of the working electrodes are covered with PDMS hydrophobic layers to form a hydrophilic / hydrophobic channel separation structure. The surfaces of a plurality of working electrodes are modified with different types of metal nano-catalysts and covered with PDMS hydrophobic layers to form a hydrophilic / hydrophobic channel separation structure, and the multi-channel electrochemical detection electrode separates gas molecules through hydrophilic / hydrophobic channels, so that the cross reaction can be inhibited, and the cross sensitivity can be reduced.

A working electrode is inserted into the plant to monitor the health of the plant components or to detect physical, mechanical damage or environmental change in the soil or atmosphere. A standard electrode is inserted into soil surrounding the plant or in the plant itself. A data logger connects the working electrode and the standard electrode. The data logger measures the potential difference between the working electrode and the electrolyte to provide the ability to compare a measured potential difference with a predetermined critical potential difference for the plant. A second electrochemical cell can inject electrons and ions into the plant. The plant can be used as a sensor to monitor the environmental change in the soil or in the atmosphere.

The invention belongs to the technical field of metal surface treatment, and relates to a preparation method of a metal surface lattice passivation corrosion-resistant film, which comprises the following steps of: polishing and cleaning a metal surface, constructing a three-electrode system, and applying cathode voltage to the metal to carry out surface modification treatment so as to realize metal surface lattice reconstruction, thereby obtaining the metal surface lattice passivation corrosion-resistant film. A compact adsorption layer of corrosion inhibition molecules is formed; the three-electrode system comprises metal as a working electrode, a platinum sheet as an auxiliary electrode and silver / silver chloride or saturated calomel as a reference electrode. According to the method, metal surface lattice reconstruction is achieved through cathode voltage treatment, the technical thought of traditional anodic oxidation is subverted, the passive film forms a regular lattice structure, defects in the film are greatly reduced, permeation of a corrosion medium is effectively blocked, and the corrosion resistance of metal is remarkably improved.

The invention discloses an electrocatalytic oxidation method for highly selectively converting 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid by using a cobalt-nickel bimetallic catalyst, and belongs to the technical field of electrochemistry. Firstly, foamed nickel is pretreated; secondly, preparing a cobalt-nickel mixed solution, synthesizing the catalyst by adopting a solvothermal method, and characterizing the catalyst; and thirdly, preparing a three-electrode system by taking the cobalt-nickel catalyst as a working electrode, a spiral platinum wire electrode as a counter electrode, a Hg / HgO electrode as a reference electrode, an alkaline solution as an electrolyte and a Nafion 117 proton membrane as a diaphragm to realize conversion. And finally, testing the stability and cyclicity of the cobalt-nickel catalyst. Under the same potential, the material has the highest current density, the maximum electrochemical active area and the optimal charge transfer rate; the self-degradation of HMF can be effectively inhibited, the electrocatalytic oxidation has lower initial potential than the oxygen evolution reaction, and the electrode cycle stability is good; the method is simple in process, mild in condition and beneficial to industrial production.

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 relates to the field of new energy batteries, in particular to a negative electrode current collector and a preparation method thereof, a pole piece and a battery, and the preparation method comprises the following steps: preparing a carbon nanotube with a hydroxyl group on the surface; mixing a carbon nanotube with hydroxyl on the surface, an isocyanate raw material, diol, water and a second organic solvent, and carrying out heating reflux treatment to obtain a third product; mixing the third product, a polytetrahydrofuran raw material, a second organic solvent and a second ammonium salt, and carrying out a polymerization reaction to obtain a precipitate; carrying out drying treatment on the precipitate, so as to obtain foam polyurethane modified by the carbon nano tube; and taking the foam polyurethane modified by the carbon nano tube as a working electrode, carrying out deposition reaction on the working electrode to obtain a base material with a metal layer deposited on the surface, and washing and drying the base material with the metal layer deposited on the surface. The negative electrode current collector lithium metal battery provided by the invention has relatively large energy density, relatively small battery internal resistance, relatively strong cycle performance and relatively low safety risk.

The invention discloses a micro-structure electrode flexible electrochemical sensor which comprises a flexible electrode substrate with a hemispherical array and three surface electrodes (a working electrode, a counter electrode and a reference electrode). The working electrode comprises a protruding metal array and a through hole array, protruding metal corresponds to the hemisphere array of the substrate, and the through hole array penetrates through the substrate. According to the sensor, the reaction area is increased through the three-dimensional structure, electron transfer is promoted, oxygen supply is guaranteed through the through hole array, the mechanical stability is enhanced through the flexible substrate and the structural design, and the sensor is suitable for wearable equipment.

The present invention relates to a niobium metal oxide, niobium metal oxide secondary particles and a method for preparing the same, and a working electrode and an electrochemical cell comprising the niobium metal oxide secondary particles. The niobium metal oxide has the formula (I): NbxMyOz, where M is a metal selected from the group consisting of Ti, Zr, V, Cr, W and Mo, x is 2 to 18, z is 2.5 x + 3y and x / y is 1 to 3, and the crystal structure of the niobium metal oxide is a tetragonal tungsten bronze structure having four or eight pentagonal channels per cell, and a portion of the pentagonal channels is filled with-Nb-O-Nb-O-chains, and the remainder of the pentagonal channel is optionally embedded with lithium.

The invention discloses a dopamine sensor working electrode based on an MOF material and a preparation method thereof, and belongs to the technical field of electrochemical sensing. The working electrode is composed of a pure MOF Cu-HHTP modified glassy carbon electrode and a Nafion film covering the surface of the glassy carbon electrode, and the preparation method of the working electrode comprises the following steps: synthesizing Cu-HHTP (Cu < 2 + > and a hexahydroxy triphenyl ligand are coordinated to form a two-dimensional honeycomb layer) through a solvothermal method, dispensing Cu-HHTP dispersion liquid on the surface of the glassy carbon electrode, and then covering the glassy carbon electrode with the Nafion film to form the combined electrode. The dopamine sensor prepared by the preparation method disclosed by the invention has high sensitivity, high anti-interference capability and long-term stability. The preparation process is simple, complex conductive additives are not needed, and the method is suitable for rapid and accurate detection of dopamine in complex biological samples.

A method for manufacturing an implantable micro-biosensor includes the steps of: a) providing a substrate, b) forming on a first surface of the substrate a first working electrode which at least includes a first sensing section including a first conductive material, c) forming on the first surface of the substrate at least one second working electrode which at least includes a second sensing section disposed proximate to at least one side of the first sensing section, and d) forming a chemical reagent layer which at least covers the first conductive material of the first sensing section and which reacts with the analyte to produce a product.

The invention provides a flexible electrochemical sensor, a preparation method and application. The flexible electrochemical sensor comprises a flexible substrate, three electrodes, a conductive strip, an external wire and a multi-cavity polypyrrole film, the three electrodes comprise a working electrode, a reference electrode and an auxiliary electrode and are printed on the flexible substrate; the conductive strip is connected with the three electrodes, the conductive strip is packaged through an insulating tape, and only working areas of the three electrodes are exposed; the external wire is pasted on the conductive strip through conductive silver adhesive. The multi-cavity polypyrrole film is modified on the surface of the working electrode. The technical problems that existing equipment is insufficient in portability, cannot meet the requirements of on-site rapid screening and real-time analysis of large-batch samples, and is difficult to realize on-site mobile detection are solved. The invention provides a feasible technical means for portable, mobile and on-site rapid detection of high-harm heavy metal ions such as Hg < 2 + > and Cd < 2 + >, and the method is simple to operate and extremely low in cost.

The invention provides an electrode for monitoring active oxygen substances of tumor cells in real time, a detection system and a preparation method of the electrode. According to the electrode, an electrode array is constructed on a glass substrate through an MEMS technology, the electrode comprises a working electrode, a reference electrode and a counter electrode, the surface of the working electrode is modified with an AuNPs / ZIF-8 ZIF-67 nano-enzyme material so as to enhance the detection sensitivity of reactive oxygen species (ROS), and the detection system comprises the electrode, a PDMS cavity and an electrochemical detection device. The cell culture chamber is fixed on the electrode through plasma bonding and is provided with a through hole to be matched with the Transwell cell culture chamber, so that ROS released by incubated tumor cells can be directly diffused to the surface of the electrode, and efficient detection is realized. By optimizing the electrode modification material and the system structure, the detection sensitivity and stability are improved, and the sensor has real-time monitoring capability and is suitable for biomedical research and anti-cancer drug screening.

The application discloses an electrochemiluminescence immunosensor for detecting interleukin-1 beta and a preparation method and application thereof, and comprises a three-electrode system of a working electrode, a reference electrode and a counter electrode; the working electrode is a modified electrode of CoAl layered double hydroxide, is loaded with platinum nanoparticles after being etched by alkali, and is obtained by fixing interleukin-1 beta antibodies and blocking non-specific sites; and a solution containing luminol is used as an electrolyte during detection of the immunosensor. The working electrode of the immunosensor takes oxygen-rich vacancy CoAl layered double hydroxide as a substrate, combines with platinum nanoparticles to realize EMSI effect, significantly enhances the electrochemiluminescence signal of a luminol-dissolved oxygen system, realizes quantitative detection of IL-1 beta by combining with specific antigen-antibody recognition, and has the characteristics of strong anti-interference ability, fast detection speed and good stability.

The invention discloses accelerated corrosion test detection equipment which comprises a cover plate, a basic platform plate, a test tank body, an Ag / Ag reference electrode, a platinum sheet counter electrode, a working electrode, a sealing block, a fixing clamp, a sealing washer, a bolt fastener, a control box, a control box switch, a power plug and a temperature regulation and control module, and the temperature regulation and control module comprises a display, a temperature regulator, a temperature sensor and a heating rod. According to the structural design, corrosion tests at different temperatures and under different corrosion solutions can be achieved, three-electrode electrochemical corrosion monitoring is achieved under the condition that the equipment structure and the corrosion environment do not need to be greatly changed, meanwhile, short-term acceleration tests are achieved, the actual corrosion environment is simulated, the actual service life of a sample is calculated in a fitting mode, and the application prospect is wide. Operation is convenient and fast, the test period is shortened, the test progress is accelerated, the test efficiency is improved, the test result is more accurate, simulation of the long-term variable-temperature corrosion environment can be effectively achieved, and reliability is higher.

The present disclosure provides a sensing assembly for sensing a property of a fluid sample comprising at least one working electrode provided in the primary fluid channel configured to sense a property of a fluid sample in the primary fluid channel; a secondary fluid channel adjacent to and fluidly connected to the primary fluid channel along the primary flow path; and a reference electrode element provided in the secondary fluid channel. The secondary fluid channel is arranged as a branch from the primary fluid channel so as to limit the flow of fluid sample from the primary fluid channel to the reference electrode element. Alternatively or additionally, a method comprises determining a property of a sample comprising providing such a sensing assembly.

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

The invention provides an X-ray absorption spectrum characterization system and an X-ray absorption spectrum characterization method for electrochemical reaction under a high-current working condition. A high-current electrochemical workstation provides current density not lower than that of a working condition electrolytic tank; the working condition electrolytic tank comprises a working electrode chamber and a counter electrode chamber which are oppositely arranged, and an ion exchange membrane arranged between the working electrode chamber and the counter electrode chamber; the working electrode chamber comprises a current-conducting plate made of a metal sheet, a working electrode loaded with a catalyst is arranged on one side, facing the ion exchange membrane, of the current-conducting plate, and a hollow flow channel is formed in the central area of the working electrode chamber; the working electrode chamber further comprises an X-ray window sheet for transmission of incident X-rays and fluorescent X-rays generated by the catalyst; the counter electrode chamber is provided with an electrolyte flow channel, and a counter electrode is arranged on one side, facing the ion exchange membrane, of the counter electrode chamber; and the electrolyte control system is used for realizing circulating flow of the electrolyte. Under the working conditions of high current density, strong bubble effect and high X-ray absorption, in-situ, real-time and high signal-to-noise ratio characterization of the microstructure of the catalyst can be realized.

An object is to provide a micro-analysis chip in which a satisfactory area of contact between a specimen and an ion-selective membrane and an adequate amount of the specimen that reacts with the ion-selective membrane can be secured, and which is excellent both in measurement sensitivity and in ion selectivity. In order to achieve the object, a micro-analysis chip as described below is provided. That is, provided is a micro-analysis chip including a channel region which is surrounded by a channel wall provided inside a porous substrate. The channel region includes a first channel chamber containing a reference electrode, a second channel chamber containing a working electrode. The working electrode is covered with an ion-selective membrane containing an ingredient that has ion selectivity. The ion-selective membrane has an exposed surface serving as a dispensing section to which a specimen is dispensed.

The present disclosure is related to a bimetallic monatomic nano-enzyme electrochemical sensor, and a preparation method therefor and an application thereof. The bimetallic monatomic nano-enzyme electrochemical sensor comprises a working electrode, a counter electrode, a reference electrode and an electric signal control device; the working electrode is formed by coating a gallium-copper bimetallic monatomic nano-enzyme and a conductive carbon paste on a flexible carrier; and according to the present disclosure, the electrochemical sensor is constructed by loading a catalytic material of the gallium-copper bimetallic monatomic nano-enzyme on an electrode substrate material, which is used for detecting a volatile amine content in fresh meat, so as to detect a freshness of fresh meat.

The application discloses a preparation method of a high-density and high-stability conductive polymer film based on electrochemical polymerization, and comprises the following steps: using an oxidant solution and a BFDO monomer solution to pretreat a formed foil to obtain a working electrode, then immersing the working electrode and a reference electrode into an electrolyte to perform electrochemical oxidation polymerization, and obtaining the high-density and high-stability conductive polymer film based on electrochemical polymerization. The pretreated formed foil containing N-type conductive polymer PBFDO is prepared by using a chemical in-situ polymerization method on the formed foil, and when the pretreated formed foil is applied in the field of capacitors, the conductivity and electron transport capacity of the capacitor can be improved, and the stability problem caused by the coupling of positive and negative charges in the traditional capacitor is greatly improved.

Techniques for determining microbiological corrosion include flowing a mixed-phase wellbore fluid from at least one tank into a volume of a reactor tank of a microbiological corrosion reactor; controlling a multi-channel potentiostat coupled to a three-electrode cell assembly positioned in the volume, the three-electrode cell assembly including a working electrode, a counter electrode, and a reference electrode, where each of the working electrode, the counter electrode, and the reference electrode is positioned in the volume to contact the mixed-phase wellbore fluid; based on controlling the multi-channel potentiostat, activating the working electrode in the mixed-phase wellbore fluid in the volume; and determining, based on activating the working electrode, a corrosion rate of at least one of the working electrode or a target coupon positioned within the mixed-phase wellbore fluid in the volume.

The embodiment of the invention discloses an electrode evaluation method. The method comprises the following steps: acquiring the initial active lithium amount of a to-be-detected symmetric battery; the working electrode and the counter electrode of the symmetrical battery are made of graphite; carrying out charging and discharging process control on the symmetrical battery for multiple times to obtain the residual active lithium amount; based on the initial active lithium amount and the residual active lithium amount, evaluating a graphite electrode of the symmetric battery; in each charging and discharging process, the symmetrical battery is charged and discharged at a relatively high first charging rate and a relatively high first discharging rate, so that lithium removal of the counter electrode and the working electrode is completed, and the symmetrical battery is charged to a second voltage, so that electrolysis of a solid electrolyte interface film of the counter electrode is completed; and discharging the symmetrical battery to a fourth voltage to enable the solid electrolyte interface film of the working electrode to complete electrolysis. According to the invention, the time of each charging and discharging process and the consumption speed of lithium ions are accelerated, so that the evaluation speed of the graphite electrode is accelerated.