25 results about "Chronoamperometry" patented technology

This invention discloses a time-division multiplexed dual-mode monitoring sensor for blood glucose and implanted wound infection, and its monitoring method. The sensor includes an electrically connected sensing unit and a detection unit. The sensing unit includes a three-electrode system of sensing electrodes, and the detection unit includes a chronoamperometry circuit for blood glucose measurement, an open-circuit voltage method circuit for wound pH measurement, a switching circuit, and a control module. The control module regulates the switching circuit, enabling the sensor to alternately perform blood glucose and implanted wound pH measurements in a time-division multiplexed manner. Based on the pH measurement data, the blood glucose measurement results can be dynamically calibrated, and an alarm is triggered when the wound infection level measured by the pH measurement data exceeds a preset threshold. This invention optimizes the combination relationship of the three-electrode system and the timing control of the detection modes, achieving simultaneous detection of two indicators without adding additional electrodes. This not only improves detection accuracy and wearing comfort but also simplifies the device structure and reduces costs, showing great application potential.

The application relates to the field of electrochemical analysis methods, and particularly discloses a preparation method of an electrode capable of simultaneously detecting amaranth, carmine and indigo and application of the electrode; the electrode preparation method is as follows: firstly, Fe / Co Prussian blue seed modified carbon fiber paper is prepared through a chemical deposition method; secondly, the Fe / Co Prussian blue seed modified carbon fiber paper is subjected to a hydrothermal reaction to prepare hollow cubic octahedral Fe / Co Prussian blue nanomaterial modified carbon fiber paper electrode; finally, the hollow cubic octahedral Fe / Co oxide nanomaterial modified carbon fiber paper electrode (CoFe2O4@CFP) is obtained through calcination. The CoFe2O4@CFP electrode is used as a working electrode, and the content of the three pigments, i.e. amaranth, carmine and indigo, in a sample to be detected can be simultaneously detected by adopting a differential pulse voltammetry method combined with a chronoamperometry method. Compared with other methods, the method has the advantages of simple preparation, rapid detection, wide application in simultaneous determination of amaranth, carmine and indigo in actual samples such as candies, tap water and beverages, high detection sensitivity, wide detection range and great practical application potential.

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.

Provided is a transition metal-doped nickel oxyhydroxide catalyst, its preparation method, and its application in seawater electrolysis for hydrogen production. The method includes: (1) constructing a three-electrode system and using a chronoamperometry or chronopotentiometry method to electrodeposit a precatalyst onto a conductive substrate from a mixed metal salt solution containing nickel, iron, and at least one other transition metal salt such as cobalt or chromium; and (2) using the precatalyst-loaded substrate as a working electrode in an alkaline solution and applying a constant current to perform an in-situ conversion, thereby forming the final transition metal-doped nickel oxyhydroxide catalyst. The resulting catalyst exhibits high catalytic activity, high selectivity for oxygen evolution, and exceptional long-term stability under high current densities, making it highly suitable for direct seawater electrolysis systems,

This invention relates to the field of electrocatalytic hydrogenation, specifically to a method for electrocatalytic NADH regeneration. The method includes the following steps: using copper foam as the anode, platinum wire as the cathode, and KOH solution as the electrolyte, in-situ oxidation is performed using a chronopotential method; the nanowires are then washed with water and ethanol, vacuum dried, and calcined in a tube furnace to obtain CuO nanowires; using the CuO nanowires as the cathode and platinum wire as the anode, the CuO nanowires are in-situ reduced using a chronoamperometry method to obtain Cu nanowires; thioacetamide and acetic acid are added to a copper sulfate solution, stirred to obtain a reaction solution; the Cu nanowires and reaction solution are added to a chemical bath deposition container, heated, washed, and dried to obtain Cu... x S nanowires; electrocatalytic NAD in an inert gas atmosphere + Regeneration of 1,4-NADH; in S4, the electrocatalytic potential is -1.1 to -1.25 V vs. Ag / AgCl. This method enables efficient and selective hydrogenation at the 1,4 position to generate NADH.

The invention relates to a preparation method of a Co3O4 nanowire spherical array coupled bimetallic hydroxide electrode material, and belongs to the technical field of electrocatalyst preparation. The preparation method comprises the following steps: pre-treating carbon cloth with a piranha solution, preparing a precursor solution from Co (NO3) 2.6 H2O, NH4F and Co (NH2) 2, preparing a Co3O4 nanowire by using a hydrothermal method in combination with an annealing process, preparing a bimetallic solution, and carrying out electro-deposition to obtain the Co3O4 nanowire coupled bimetallic hydroxide electrode material. A high-binding-force and high-crystallinity Co3O4 nanowire structure is constructed by pretreating carbon cloth, accurately controlling the molar ratio of Co < 2 + > to F <-> to urea in a precursor solution and combining a hydrothermal method with an annealing process, meanwhile, step-by-step electro-deposition is carried out in the range of-1.2 V to 0.2 V by adopting a chronoamperometry, each step stays for 5 seconds, and codeposition kinetics of Ni < 2 + > and Fe < 3 + >, Co < 2 + >, Zn < 2 + > or Cu < 2 + > is accurately controlled; through collaborative optimization of the means, the catalytic activity, the structural stability and the charge transfer efficiency of the composite electrode material are remarkably improved.

The invention provides a method for rapidly detecting pesticide residues in fruits and vegetables, and belongs to the field of pesticide analysis and detection. The method comprises the following steps: mixing a copper nanoparticle / reduced graphene oxide / chitosan composite material, acetylcholin esterase, choline oxidase and a cross-linking agent glutaraldehyde solution for reaction to obtain a double-enzyme functionalized nano composite material; dispensing a chitosan solution on the surface of a working electrode of a screen-printed electrode, drying to form a film, and covalently modifying the surface of the electrode with the bienzyme functionalized nano composite material through a cross-linking agent glutaraldehyde to obtain a sensing electrode; according to the method, acetylcholine is taken as a substrate, a sensing electrode is used, a chronoamperometry is adopted, inhibition ratios of pesticide standard substance solutions with different known concentrations to electrode response current are detected, and a standard curve between the pesticide concentration and the current inhibition ratio is established; and calculating the pesticide residue concentration in the fruit and vegetable sample to be detected according to the current inhibition ratio of the liquid to be detected and the standard curve. Therefore, the sensitivity and accuracy of pesticide residue detection in fruits and vegetables are improved.

The invention relates to the technical field of electrical property testing of materials, in particular to a method for rapidly and quantitatively detecting the conductivity of photocuring conductive hydrogel, which comprises the following steps: step S1, pretreatment of a curing container; s2, injecting a hydrogel solution, curing and detecting the conductivity; placing the curing container on a detection base; an electrolyte solution and deionized water are dropwise added into the two liquid storage tanks respectively, the head end and the tail end of the curing container are soaked in the electrolyte solution and the deionized water respectively, then a detection device is used, a chronoamperometry method is adopted for measuring current, and the conductivity is obtained through calculation; the method is high in detection efficiency, rapid and quantitative detection of conductivity is realized, real conductivity detection data can be obtained, the accuracy and reliability of a detection result are ensured, and the problems that an existing detection method is long in detection time consumption, low in detection efficiency, low in conductivity detection data authenticity and poor in detection accuracy are solved. And the accuracy and the reliability of a detection result cannot be ensured.

The invention discloses a nickel cobalt phosphide electrochemical low-reduction-potential sensitive electrode based on a nitrite catalytic reduction mechanism, and a preparation method and application thereof, and belongs to the technical field of electrochemical sensing. The preparation method comprises the following steps: firstly, pretreating carbon cloth by adopting a strong acid mixed solution to enhance the hydrophilicity of the carbon cloth, cleaning for later use, and then dissolving a cobalt source, a nickel source and phosphate in deionized water according to a specific proportion to prepare an electro-deposition solution; and then, taking the pretreated carbon cloth as a working electrode, and performing electrodeposition on the surface of the working electrode by adopting a chronoamperometry to form a cobalt nickel phosphide nanoflower structure, so as to prepare the sensitive electrode. When the electrode is applied to nitrite detection, the electrode shows excellent electrocatalytic reduction activity in a system formed by a mercury / mercuric oxide reference electrode and a platinum counter electrode. The electrode prepared by the invention can realize high-sensitivity, rapid and low-potential detection of nitrite ions, and effectively solves the problems of insufficient sensitivity, high oxidation overpotential, poor selectivity and the like of an electrochemical nitrite sensor.

The application belongs to the technical field of electrochemical energy storage, and relates to electrochemically activated vanadium diboride, a preparation method thereof and application of the vanadium diboride in a water-based energy storage positive electrode material. The method comprises the following steps: assembling a vanadium diboride positive electrode, a separator, a negative electrode and a water-based electrolyte into an energy storage system; and activating by using a chronocoulometry method, a repeated cyclic voltammetry method, a chronopotentiometry method or a multiple constant current charge-discharge cycle method to obtain an in-situ electrochemically activated vanadium diboride positive electrode material. The electrochemically activated vanadium diboride positive electrode is applied to a Zn 2+ , Li + , NH4 + , Mg 2+ , etc. water-based energy storage system, and exhibits high electrochemical activity. For example, a zinc ion battery assembled at a current density of 0.1 A / g has a specific capacity of 331 mAh / g. The electrochemically activated vanadium diboride water-based energy storage positive electrode material provided by the application has high specific capacity and long cycle life, is low in preparation cost, simple in preparation process and suitable for large-scale industrial production.

This invention discloses a method for preparing a PdCu / CP electrode and its application, as well as an electrocatalytic hydrogenation-aldehyde oxidation battery. The preparation involves using a mixed aqueous solution of palladium and copper sources as the electrodeposition solution, and carbon paper as the working electrode. Electrochemical deposition is performed in a three-electrode system using a chronoamperometry method. The deposition potential is -0.6 to -0.1 V vs. Ag / AgCl, and the deposition time is 10-30 min. Pd and Cu are loaded onto the carbon paper in an alloy form to obtain the PdCu / CP electrode. The molar ratio of Pd in ​​the palladium source to Cu in the copper source in the electrodeposition solution is 1:1.2-1.5. The PdCu / CP electrode prepared by this invention can simultaneously serve as both cathode and anode for electrocatalytic hydrogenation and aldehyde oxidation. Furthermore, it can efficiently generate high-value chemicals simultaneously at both the anode and cathode without external power, effectively reducing energy consumption. The high synthesis efficiency of high-value-added chemicals demonstrates significant application potential.

Disclosed is a method for preparing an electrochemically activated electrode for electrochemical reduction reactions, the electrode comprising at least one catalytic material based on at least one group VIB metal supported on an electrically conductive support, the method consisting in carrying out an electrochemical treatment on an electrode comprising at least one catalytic material based on at least one group VIB metal supported on an electrically conductive support. The electrochemical treatment, which is carried out by cyclic voltammetry (CV) or chronoamperometry (CA), consists of a step of oxidation under specific conditions.

The invention relates to the technical field of catalyst preparation, in particular to a method and a system for preparing a catalyst for preparing glycollic acid through efficient electrocatalytic oxidation of PET (polyethylene terephthalate). The method comprises the following steps: ultrasonically cleaning foamed nickel to obtain ultrasonically cleaned foamed nickel, preparing a hydrothermal solution, performing hydrothermal reaction on the hydrothermal solution to obtain an initial intermediate, and cleaning and drying the initial intermediate to obtain the catalyst for preparing glycollic acid through efficient electrocatalytic oxidation of PET. The method comprises the following steps: obtaining an intermediate, shearing an intermediate sheet, preparing an electro-deposition liquid, constructing a three-electrode system, depositing a working electrode to obtain deposited Pd particles, slowly flushing the deposited Pd particles to obtain clean deposited Pd particles, testing the catalyst by a linear voltammetry scanning method to obtain the catalytic activity of the catalyst, and performing a chronoamperometric test on the catalyst to obtain the catalytic activity of the catalyst. The selectivity test is performed on the catalyst, so that the selectivity of the catalyst is excellent, and the preparation of the catalyst for preparing glycollic acid through high-efficiency electrocatalytic oxidation of PET is completed. The use amount of precious metal can be reduced on the premise of ensuring the catalytic performance.

The invention discloses a MoS2 electrochemical sensor as well as a preparation method and application thereof, and belongs to the technical field of detection of residual quantity of harmful substances. The MoS2 / CC electrode material is successfully constructed on the carbon cloth substrate by adopting the electro-deposition method and combining high-temperature calcination, the MoS2 film can be directly grown on the surface of the electrode through the electro-deposition method by adjusting parameters such as voltage and current density, accurate control of thickness and morphology is realized, a high-temperature complex process of a chemical vapor deposition (CVD) method is avoided, energy consumption is remarkably reduced, and the method is suitable for industrial production. And the adhesive is prevented from covering the active sites of the catalyst. Compared with a hydrothermal method, the product is more uniform, and the cost is lower. A chronoamperometry (i-t) is adopted for deposition, the problem of reduction corrosion of a potential circulation method (CV) can be avoided, and meanwhile the deposition rate is remarkably higher than that of cathodic electrolysis (CE). The prepared sensor shows excellent electrochemical sensing performance on H2O2 by virtue of the excellent characteristics of the transition metal sulfide MoS2.

This invention provides a method and apparatus for perioperative fibrinogen detection, comprising the following steps: S1, modifying the working electrode surface of a screen-printed electrode with antibody-functionalized self-supporting graphene aerogel material; S2, adding the serum sample to be tested to the modified working electrode surface; S3, adding horseradish peroxidase-labeled fibrinogen detection antibody to the modified working electrode surface; S4, adding a matrix-type TMB solution containing H2O2 to the modified working electrode surface; S5, collecting the reduction current of electrochemically active substances on the electrode surface using a chronoamperometry method; S6, calculating the fibrinogen concentration based on the reduction current value and a standard curve. This invention solves the technical problems of low electron transport efficiency and detection sensitivity, structural instability, poor biocompatibility, and difficulty in enriching electroactive substances when using graphene-modified electrodes.

The application belongs to the technical field of fuel cells, and discloses a preparation method of a flexible spherical copper composite ZIF-8 electrode and application thereof. The preparation method comprises the following steps: preparing boron-doped SiNWs, preparing a boron-doped SiNWs electrode, preparing a SiNWs@ZIF-8 electrode, performing heat annealing treatment on the SiNWs@ZIF-8 electrode, and depositing Cu balls by means of chronocoulometry. The application significantly reduces the preparation cost of the electrode, discards the dependence of a traditional ethylene glycol electrocatalytic electrode on noble metals, and does not need to compensate for performance defects by means of noble metal and non-noble metal doping, so that the preparation cost is greatly reduced from the material level.

A method, an electrochemical sensor and a system for selective detection of infections. The method detects a concentration of nicotinamide adenine dinucleotide, NADH, from a bacterial culture through a cyclic voltammetry or chronoamperometry applied to an electrochemically active polymer. Therefore, prokaryotic cells can be detected while eukaryotic cells remain undetected. The infections can include bacterial infections and fungi or yeasts microbial infections.

The invention discloses a boron-doped diamond electrode with high oxygen evolution potential, which is characterized in that monocrystalline silicon is pretreated by using diamond grinding liquid, the obtained monocrystalline silicon after seed crystal is used as a substrate, and the boron-doped diamond electrode is prepared by using a hot filament chemical vapor deposition method; carrying out oxidation treatment on the boron-doped diamond electrode by utilizing an electrochemical workstation and adopting a chronoamperometry: carrying out oxidation treatment for 10-60 minutes in an acidic electrolyte under the treatment voltage of 2.5-8.5 V by taking a platinum sheet electrode as a counter electrode and a saturated calomel electrode as a reference electrode, so as to obtain the boron-doped diamond electrode with high oxygen evolution potential, according to the invention, the oxygen evolution potential of the boron-doped diamond electrode can be increased, so that the ozone electric synthesis efficiency of the boron-doped diamond electrode is effectively improved.

This invention discloses a method for the catalytic reduction of phenylacetylene to styrene using a palladium cluster-modified copper foam electrode. The method involves first immersing cleaned copper foam in an aqueous palladium salt solution and allowing it to react at room temperature for 6–12 hours to prepare the palladium cluster-modified copper foam electrode. Then, a three-electrode system is used, employing a chronoamperometry method to achieve the electrocatalytic partial hydrogenation of phenylacetylene to styrene. The palladium cluster-modified copper foam electrode involved in this invention exhibits high catalytic activity and high selectivity for the partial hydrogenation reaction of phenylacetylene. Furthermore, the electrode preparation method is simple, low-cost, and environmentally friendly, thus this invention possesses extremely high potential commercial value.

The invention provides a method and a device for detecting fibrinogen in a perioperative period. The method comprises the following steps: S1, modifying the surface of a working electrode of a screen-printed electrode with an antibody-functionalized self-supporting graphene aerogel material; s2, dropwise adding a serum sample to be detected to the surface of the modified working electrode; s3, dropwise adding a fibrinogen detection antibody labeled by horse radish peroxidase to the surface of the modified working electrode; s4, dropwise adding a matrix type TMB solution containing H2O2 to the surface of the modified working electrode; s5, collecting the reduction current of the electrochemical active substance on the surface of the collector by a chronoamperometry; and S6, calculating the fibrinogen concentration according to the reduction current value and the standard curve. According to the invention, the technical problems of low electron transmission efficiency and detection sensitivity, unstable structure, poor biocompatibility and difficulty in enrichment of electroactive substances existing in a graphene modified electrode are solved.

The application belongs to the field of nano-biosensors, and discloses an aptamer sensor for chronoamperometry detection, a preparation method and application thereof. Gold nanoparticles are loaded on conductive glass by using in-situ reduction method, and then DNA aptamer is modified. The DNA aptamer can specifically adsorb target bacteria in a test solution on the surface of the material and generate a current response linearly related to the concentration of the bacteria solution. A PBS buffer solution containing MgCl2 is used as an electrolyte, and the chronoamperometry method can be used to measure the current response of different concentrations of Staphylococcus aureus. The new nano-biosensor provides a practical new method for on-site rapid detection of bacteria, and can be widely used in the fields of food detection and environmental detection.

The invention provides a double-enhanced 3D gold nanoflower biosensor as well as a preparation method and application thereof. The biosensor comprises a gold nanoflower electrode AuNS obtained by depositing a gold solution on an SPCE electrode. The sensor can be used for noninvasive detection of hormones. The method specifically comprises the following steps: firstly, modifying an antibody for capturing a target to the surface of a gold nanoflower electrode; then dropwise adding a sample on the electrode, and then adding a biotin modified antibody to form a sandwich structure for antibody recognition; then, an SA-HRP solution is added, and tyramine-biotin and HRP are deposited on the electrode through biotin-streptavidin combination; and finally, adding an SA-HRP solution, and detecting the redox current of the HRP catalyzed TMB / HO system by a chronoamperometry to realize the quantitative detection of the antigen concentration. According to the invention, the free hormone protein in saliva can be efficiently detected with high specificity and high sensitivity.

The invention discloses a rapid environmental pollutant detection method based on nano-enhanced biosensing, and particularly relates to the field of biosensing and environmental analytical chemistry, which comprises the following steps: preparing a rare earth doped nano-enzyme probe with peroxidase-like activity through an ultrasonic-assisted in-situ doping method; the method comprises the following steps: collecting a TMB (Tetramethylbenzidine) substrate, coupling with a specific biological recognition molecule to construct a signal probe, assembling a sensing interface on a pretreatment electrode, fixing a capture probe by adopting a streptavidin-biotin system, detecting by a competition method to enable a target pollutant and the capture probe to compete and combine with the signal probe, and finally catalyzing the TMB substrate by utilizing nano-enzyme to generate an electrochemical signal. A chronoamperometric method is adopted for quantification, signal intensity is inversely proportional to pollutant concentration, high catalytic activity and stability of rare earth doped nano enzyme are utilized, and a competitive sensing mode is combined, so that rapid and accurate detection of organophosphorus pesticide, antibiotics and heavy metal ion environmental pollutants is realized.

A method for reducing a toxicity of wastewater, including: selecting a working electrode based on a biochemical oxygen demand to chemical oxygen demand (B / C) ratio of the wastewater; constructing a microbial electrochemical system using the graphite rod or the biochar / MoS2-modified graphite rod as the working electrode; adding a culture solution including the wastewater, sediment, a phosphate buffer solution, and a carbon source to the microbial electrochemical system, cultivating and enriching an electroactive biofilm on the surface of the working electrode in the microbial electrochemical system using chronoamperometry, and periodically refreshing the culture solution until the electroactive biofilm reaches a stable and mature state; and after formation of the electroactive biofilm, introducing the wastewater into the microbial electrochemical system with a matured electroactive biofilm, applying an external voltage to the working electrode, and operating the microbial electrochemical system under intermittent polarization switching between open-circuit and closed-circuit modes.

A method (ICA) for fast charging a battery system comprising one or multiple cells arranged is series and in parallel, within a SOC range (ΔSOC) and a total charge time t(charge), comprising steps of applying a series of intermittent constant voltage plateaus (CVk, k=1, 2, 3... ) for a duration t(CVk) while monitoring the charge current I (C-rate) and the battery temperature Teell, allowing the current Ito go to zero (rest) for a short time duration t(rest) within the constant voltage plateau and measuring the open-circuit voltage during rest, noted as p-OCV or pOCV, between two successive rest times, within a same voltage plateau CVk, applying a voltage pulse for a duration t(pulse), repeating rests and voltage pulses sequences until the current reaches I(min), at Imin applying a voltage step ΔV between two successive voltage plateaus CVk and CVk+i. and measuring the current at the onset of ΔV application noted I(max).