13 results about "Linear sweep voltammetry" patented technology

The application discloses a kind of diaphragm ion resistivity test methods, comprising the following steps: two pieces of same size foil, diaphragm to be measured and target electrolyte are made into only one layer diaphragm button cell;Pre-tightening force is applied to the prepared button cell;Linear sweep voltammetry in electrochemical workstation is used to test the linear voltammogram of button cell;According to the ion resistance and layer number curve diagram of different layer number diaphragm button cell, the calculation method of diaphragm ion resistivity is: ρ=k×S÷d, wherein the slope k is the ion resistance of the diaphragm, S is aluminum foil area, and d is diaphragm thickness;Through the test method of the application, it is not necessary to test the meaningless diaphragm electronic resistance in lithium battery, but directly test diaphragm ion resistivity, and the method is more accurate and can meet actual demand.

This invention discloses a test method for the resistance of lead-grid alloy in the positive electrode plate of a storage battery to hydration short circuits, specifically implemented according to the following steps: Step 1, preparing an electrolyte for electrochemical scanning; Step 2, fabricating a working electrode; Step 3, using a three-electrode system on an electrochemical workstation, performing linear sweep voltammetry (LSV) on the working electrode to determine the peak potential and current density of the oxidation peak appearing in the potential range of -0.4V to 0.4V. This invention aims to solve the problem of hydration short circuits in storage batteries existing in the prior art.

This invention relates to the field of lithium-ion battery technology, and discloses a method for electrolyte optimization based on the actual electrochemical reaction area, a battery pack, a lithium-ion battery, and its electrolyte. The method includes: constructing an optimal dosage model for the electrolyte additive FEC, i.e., FEC... optimal =K×(ECSA initial )^α+Δ;Measurement of ECSA initial The system constant K was determined by linear sweep voltammetry; ECSA initial The system constant K is input into the optimal dosage model to predict FEC. optimal This invention breaks away from the limitations of traditional single-parameter methods by quantitatively linking the comprehensive performance index of "full cell ECSA" with the amount of FEC used through the system constant K, which characterizes the reactivity of the cathode and anode materials. Therefore, it can more accurately determine the optimal amount of FEC and ensure that the battery is at its best performance.

A solid electrolyte sheet 100 includes a first solid electrolyte layer 10 and a second solid electrolyte layer 20, respectively including a solid electrolyte. During LSV analysis according to linear sweep voltammetry, in the first solid electrolyte layer 10, a voltage at which an oxidation peak appears is more than 2.8 V (Li / Li+) or no oxidation peak appears, and in the second solid electrolyte layer 20, a voltage at which a reduction peak appears is −1.0 V (Li / Li+) or more and less than 1.0 V (Li / Li+). The composite solid electrolyte sheet including both the solid electrolyte layer with excellent oxidation stability and the solid electrolyte layer with excellent reduction stability has a wide range of a potential window, so that it can effectively suppress the deterioration of performance, such as discharge capacity and lifespan maintenance rate, during high-voltage charging of the battery.

The application discloses a preparation method of a flexible carbon paper / multitwin gold nanostructure surface Raman enhancement (SERS) substrate, which comprises the following steps: S1, a three-electrode system is built by taking dilute sulfuric acid as an electrolyte, gold nanorods as a counter electrode, Ag / AgCl as a reference electrode, and carbon paper as a working electrode; S2, gold on the counter electrode is deposited onto the surface of the working electrode by using a linear sweep voltammetry method to form a multitwin gold nanostructure; and S3, the working electrode on which the multitwin gold nanostructure is deposited is cleaned with ultrapure water, and after drying, a flexible carbon paper / multitwin gold nanostructure SERS substrate is obtained. The multitwin gold nanostructure with excellent SERS performance is generated by directly transferring gold from the gold nanorod counter electrode to the carbon paper working electrode through a direct electrotransfer method on the carbon paper, and is used as the SERS substrate.

To provide an electrolytic gold plating solution that can stably exhibit good selective gold deposition properties during gold plating. [Solution] The electrolytic gold plating solution of the present invention contains a gold source and an oxidizing agent (specific oxidizing agent) that exhibits a reaction potential above a specific value when linear sweep voltammetry is performed under specific conditions. Furthermore, in the electrolytic gold plating solution of the present invention, the concentrations of copper ions and lead ions are below a specific value. The specific oxidizing agent has the effect of improving the selective deposition of gold in the electrolytic gold plating solution. However, if copper ions or lead ions are mixed into the electrolytic gold plating solution, the effect of the specific oxidizing agent in improving the selective deposition of gold is inhibited. In the electrolytic gold plating solution of the present invention, the concentrations of copper ions and lead ions are kept low, so the selective deposition effect of gold by the specific oxidizing agent is not inhibited and is fully exerted.

The invention provides a chiral electrochemical sensor based on beta-cyclodextrin / cerium-doped copper-based metal organic framework / carboxylated multi-walled carbon nanotube (beta-CD / Ce-doped Cu-MOF / MWCNTs-COOH), a preparation method of the chiral electrochemical sensor, and a detection method for carrying out chiral recognition on an ofloxacin enantiomer by using the sensor. According to the chiral electrochemical sensor, a glassy carbon electrode is used as a substrate, a composite conducting layer of a carboxylated multi-walled carbon nanotube (MWCNTs-COOH) and a cerium-doped copper-based metal organic framework (Ce-doped Cu-MOF) is modified firstly, and then a beta-cyclodextrin (beta-CD) chiral recognition layer is modified on the surface through an electrochemical polymerization method. According to the design, the electro-catalytic activity of the Ce-doped Cu-MOF, the high conductivity of the MWCNTs-COOH and the chiral selectivity of the beta-CD are integrated, so that a synergistic enhancement effect is generated. By utilizing the sensor and combining a linear sweep voltammetry (LSV), high-sensitivity and high-selectivity detection of levofloxacin can be realized. The method has the advantages of being simple in instrument, easy and convenient to operate, rapid in detection, high in sensitivity, high in selectivity, good in stability and the like, is suitable for rapid analysis of levofloxacin in pharmaceutical preparations, food and environmental samples, and has wide application prospects in the fields of drug quality control and safety monitoring.

The present invention belongs to the technical field of hydrogen production catalysts by electrolysis of water, and more specifically relates to a preparation method and application of a bimetallic phosphide coupled layered double hydroxide electrocatalyst. The present invention uses a nickel source, an iron source, ammonium fluoride, and urea as reactants, and forms a nickel-iron layered double hydroxide nanocatalyst precursor on a conductive substrate through a hydrothermal reaction. The nickel-iron layered double hydroxide nanocatalyst precursor is then subjected to a phosphating treatment by electrodeposition to obtain a bimetallic phosphide coupled layered double hydroxide electrocatalyst. Under the test conditions of a 1 M potassium hydroxide solution, the current density in the linear sweep voltammetry curve of the catalyst is 10 mA cm ‑2 The overpotential required for the reaction is 89 mV. The catalyst has high stability, a simple and energy-saving preparation process, is suitable for industrial applications, and can be used for large-scale water electrolysis to produce hydrogen.

The present invention belongs to the technical field of water electrolysis for hydrogen production, and particularly relates to iron-nickel co-doped ammonium phosphomolybdate, a preparation method therefor, and the use thereof. The iron-nickel co-doped ammonium phosphomolybdate uses a molybdate, a phosphate, a ferric salt and a nickel salt as starting materials, and is prepared under a mild condition of 40-80℃ by means of adjusting the proportion of the raw materials and the pH value of a solution, the obtained iron-nickel co-doped ammonium phosphomolybdate being used to manufacture an oxygen evolution electrode to be applied to water electrolysis for hydrogen production. Linear sweep voltammetry in a 0.5mol / L H2SO4 solution shows that the iron-nickel co-doped ammonium phosphomolybdate of the present invention exhibits an oxygen evolution overpotential of only 210 mV at 10mA / cm2, which is lower than the oxygen evolution overpotential 370mV of noble metal iridium oxide, the oxygen evolution Tafel slope in an acidic medium of the iron-nickel co-doped ammonium phosphomolybdate is smaller than the oxygen evolution Tafel slope of the noble metal IrO2, and the alternating-current impedance reaction resistance is lower than the oxygen evolution reaction resistance of the noble metal. The electrochemical characteristics enable the iron-nickel co-doped ammonium phosphomolybdate material to achieve obvious technical and cost advantages during PEM water electrolysis for hydrogen production.

The invention discloses an electromembrane process membrane pollution rapid online monitoring method based on electrochemical characteristic parameters, and the method comprises the following steps: testing an electrode-membrane system through linear scanning voltammetry to obtain an electrochemical response curve, and collecting a limiting current based on the electrochemical response curve; based on the limiting current obtained through multi-period continuous monitoring, a linear relation of the limiting current along with the operation batch is established, and the slope and the intercept are obtained; and taking the slope and the intercept as the input of an attenuation model to obtain a limit current value Ilim (n) of the nth round, taking the Ilim (n) as the input of a performance attenuation rate model to obtain an attenuation rate PDR, and establishing an early warning mechanism. The method is suitable for the rapid monitoring requirement of the electric membrane system under the complex dynamic working condition, the limiting current is extracted by periodically collecting the electrochemical response characteristic parameters of the system, the attenuation model of the limiting current along with the operation batch is established, and rapid diagnosis and trend prediction of the membrane pollution degree are achieved.

The present disclosure involves a first diamond electrode as a working electrode and a second diamond electrode as a reference electrode, wherein a current peak corresponding to an ozone concentration in a test solution is observed in a voltammogram obtained by linear sweep voltammetry measurement in which the first diamond electrode and the second diamond electrode are brought into contact with the test solution, the test solution containing ozone at a predetermined concentration.

The invention provides a plant flexible wearable sensor and a data correction method thereof, and relates to the technical field of agriculture. The data correction method comprises the steps that silk nanofibers, temperature sensing fibers and resistance reference fibers are packaged in parallel and connected in an elastic insulation protection layer in parallel to obtain a flexible electrode, the silk nanofibers, the temperature sensing fibers and the resistance reference fibers are close in stretching coefficient, and it is ensured that the three fibers deform synchronously under axial strain and do not constrain each other; then voltage is applied to the flexible electrode in a linear scanning volt-ampere mode, and intrinsic resistance of each fiber is obtained; calculating the real-time temperature change in the packaging body by using the temperature sensing fiber, and normalizing the signal by using the resistance reference fiber as a reference to eliminate interference; and finally, calculating the real strain based on the normalized resistance after temperature compensation, and converting the real strain into the diameter variation of the plant stalks or fruit organs. According to the data correction method, high-precision, in-situ and anti-interference dynamic physiological deformation monitoring of the plant is realized.

A solid electrolyte sheet (100) according to one embodiment of the present invention comprises a first solid electrolyte layer (10) and a second solid electrolyte layer (20) each containing a solid electrolyte. The first solid electrolyte layer (10) has a voltage at which an oxidation peak occurs during linear sweep voltammetry (LSV) analysis of greater than 2.8 V (Li / Li +) or no oxidation peak occurs, and the second solid electrolyte layer (20) has a voltage at which a reduction peak occurs during linear sweep voltammetry (LSV) analysis of-1.0 V (Li / Li +) or greater and less than 1.0 V (Li / Li +). The solid electrolyte sheet, which includes a solid electrolyte layer having excellent oxidation stability and a solid electrolyte layer having excellent reduction stability, has a wide range of potential windows, and thus can effectively suppress degradation of performance such as discharge capacity and life retention during high-voltage charging of a battery.