173 results about "Cyclic voltammetry" patented technology

The invention discloses a lithium ion battery electrolyte high temperature resistance determination system, which relates to the technical field of battery electrolyte determination, and comprises a central control system, a data acquisition and analysis module and an electrochemical performance test module, the system is characterized in that the central control system is connected with a data acquisition and analysis module and an electrochemical performance test module through a laboratory local area network, the data acquisition module is connected to the electrochemical performance test module through a data line, and the electrochemical performance test module is used for detecting the electrochemical performance change of the battery electrolyte; the electrochemical performance test module comprises a cyclic voltammetry unit, an alternating current impedance spectroscopy unit and a charge and discharge test unit. By installing the electrochemical performance test module, the electrochemical performance test function of the electrolyte is realized, the problem that the electrochemical performance of the electrolyte in a high-temperature environment cannot be accurately evaluated is solved, performance data of the electrolyte under an actual battery working condition is provided, and battery design and optimization are supported.

The invention belongs to the technical field of water electrolysis hydrogen production, and discloses a three-dimensional structure self-supporting electrode and a preparation method and application thereof. The cobalt-molybdenum boride electrode with the three-dimensional structure is prepared by taking foamy copper as a substrate through a cyclic voltammetry / hydrothermal / roasting three-step method. The electrode prepared by the method is applied to alkaline water electrolysis reaction. Wherein the cobalt molybdenum boride electrode is of an urchin-shaped nanosphere structure composed of nanowires, the diameter of nanospheres ranges from 5 microns to 15 mm, and the diameter of the nanowires ranges from 20 nm to 100 nm. The electrode prepared by the method does not need additional binders such as a current collector, Nafion and sugar alcohol, so that the utilization rate of a catalyst on the surface of the electrode is greatly improved; due to the three-dimensional structure of the electrode, sufficient wetting of electrolyte can be guaranteed, and transmission of reactants and products is facilitated; the synergistic effect among the components and the three-dimensional layered porous nano-structure of the electrode can accelerate the decomposition of water. The electrode can be used for preparing a water electrolysis double-effect electrode, a seawater electrolysis double-effect electrode and a carbon dioxide electroreduction reaction anode electrode.

The embodiment of the invention provides a silicon-carbon negative electrode material and a preparation method thereof, a negative electrode plate and a battery, the silicon-carbon negative electrode material comprises a silicon-carbon inner core and a coating layer coating the silicon-carbon inner core, and the silicon-carbon inner core comprises a porous carbon substrate and nanometer silicon arranged on the porous carbon substrate. The test result of the first cyclic volt-ampere test of the silicon carbon negative electrode material meets at least one of the following conditions: (a) the value of dQ / (dV * C) of a discharge differential capacity curve in a voltage interval of 0.45 V + / -0.05 V is less than or equal to 1.7, dQ / dV represents differential capacity, the unit is mAh / V, C represents charge capacity, and the unit is mAh; (b) no sharp peak exists in a discharge differential capacity curve in a voltage interval of 0.45 V + / -0.05 V, the battery can present a smooth and stable discharge process, the capacity retention ratio and the stability of the battery after circulation are improved, and the preparation method is simple, convenient and feasible, and is suitable for industrial production.

The invention relates to the technical field of electrolytic catalysts, in particular to an electrolytic seawater oxygen evolution catalyst suitable for industrial-grade electrolytic current density and a preparation method and application of the electrolytic seawater oxygen evolution catalyst. The invention discloses a preparation method of an electrolytic seawater oxygen evolution catalyst suitable for industrial-grade electrolytic current density, which comprises the following steps: S1, substrate pretreatment, S2, electroplating liquid preparation, S3, pre-catalyst preparation, S4, catalyst activation, taking the pre-catalyst obtained in the S3 as a working electrode, taking a carbon rod as a counter electrode, and taking the electroplating liquid as an electroplating liquid. A mercury / mercuric oxide electrode is used as a reference electrode, and the catalyst is obtained through repeated cyclic voltammetry activation. The seawater electrolysis oxygen evolution catalyst prepared in the invention has excellent catalytic activity, and can stably serve in alkaline real seawater for a long time with industrial-grade electrolysis current density.

The invention relates to a layered composite electrode and a preparation method and application thereof. The electrode takes foamed nickel as a substrate layer, a layer of manganese phosphide is grown on the surface of the foamed nickel by adopting a hydrothermal method, then Co oxide is deposited on the surface of the manganese phosphide layer by adopting a cyclic voltammetry (CV) electrodeposition technology, and the CozO / MnyPx / NF electrode is obtained after cleaning and drying, and the catalyst on the surface of the CozO / MnyPx / NF electrode is of a nanosheet structure. Lattice distortion of the MnxP nano material is induced through a Co and O double-doping strategy, the electronic structure of the MnxP nano material is optimized, and the oxygen vacancy content is increased, so that the oxygen evolution performance of the catalyst is improved.

The present application provides a composite negative electrode active material and a preparation method therefor, a negative electrode plate comprising same, a secondary battery and a power consuming device. The composite negative electrode active material comprises a negative electrode active material substrate and a conductive polymer layer on the surface of the negative electrode active material substrate, wherein the cyclic voltammetry curve of the composite negative electrode active material has an oxidation peak within a range of 3.2 V-3.6 V and a reduction peak within a range of 2.1 V-2.6 V. The composite negative electrode active material provided by the present application can combine a low volume expansion, a high capacity per gram and a high initial coulombic efficiency, thus enabling a secondary battery to combine a low volume expansion, a high energy density and a long cycle life.

The present invention relates to an electrode including at least graphite, a binding agent, and a non-graphitic carbonaceous material, in which, in a half-cell produced with the electrode as a working electrode, Li foil as a counter electrode, and a solution in which lithium hexafluorophosphate is dissolved at a concentration of 1 mol / L in a mixed solution of ethylene carbonate / dimethyl carbonate / ethyl methyl carbonate at a volume ratio of 1 / 1 / 1, as an electrolytic solution:(A) a ratio of an area of a region A to an area of a region B (A / B) is 4.0% or more, in which the areas are calculated based on the following reference points in a cyclic voltammogram obtained by doping the electrode with lithium until a cell voltage of 0.01 V is achieved, and then sweeping the cell voltage from +0.01 V to −0.05 V toward the reduction side and further sweeping the cell voltage to +0.5 V toward the oxidation side at a sweeping rate of 0.01 mV / s in cyclic voltammetry:E1: a point at which an absolute value of current in a range of −0.05 V≤E1≤0.01 V in a current-voltage curve on the reduction side is minimumE2: an intersection point of a tangent line on which a slope in a range of −0.05 V≤E2≤0.01 V in a current-voltage curve on the reduction side is maximum, with a coordinate axis of voltage (current=0 mA)E3: a point at which an absolute value of current in a range of 0.05 V≤E3≤0.1 V in a current-voltage curve on the oxidation side is minimumE4: a point at which a voltage of 0.3 V is achieved in a current-voltage curve on the oxidation side;the region A:a region surrounded by the current-voltage curve on the reduction side, a straight line passing through the reference point E1 and orthogonal to the coordinate axis of voltage (current=0 mA), a straight line passing through the reference point E2 and orthogonal to the coordinate axis of voltage (current=0 mA), and the coordinate axis of voltage (current=0 mA); andthe region B:a region surrounded by the current-voltage curve on the oxidation side, a straight line passing through the reference point E3 and orthogonal to the coordinate axis of voltage (current=0 mA), a straight line passing through reference point E4 and orthogonal to the coordinate axis of voltage (current=0 mA), and the coordinate axis of voltage (current=0 mA); and(B) an electrode mixture density at a charge depth of 50% is 1.30 g / cm3 or more under the assumption that a capacity in doping of the electrode with lithium until a cell voltage of 0.05 V is achieved is a charge depth of 100%.

The invention provides a method for regenerating the activity of an inactivated metal catalytic electrode, and belongs to the technical field of electrode regeneration. The method comprises the following steps: performing electrochemical oxidation-reduction treatment on an inactivated metal catalytic electrode to obtain an active regenerated metal catalytic electrode; the electrochemical oxidation reduction treatment comprises a cyclic voltammetry reduction method or a method for electrolytic reduction after pulse oxidation reduction. According to the method, the activity of the inactivated metal catalytic electrode is regenerated by adopting a cyclic voltammetry reduction method or an electrolytic reduction method after pulse oxidation reduction, so that the service life of the metal catalytic electrode in long-time reaction can be effectively prolonged.

The invention discloses a battery lithium precipitation detection method and system based on different scanning speeds and electronic equipment, and the method comprises the following steps: obtaining a plurality of charging voltages of a battery in a charging process, providing a scanning signal with a certain amplitude based on each charging voltage, and carrying out cyclic volt-ampere tests with different scanning speeds, a cyclic voltammetry curve is obtained; based on each charging voltage, carrying out linear fitting on response current corresponding to an intermediate voltage value of a scanning signal in a linear change range of a cyclic voltammetry curve and different scanning speeds to obtain an electric double-layer capacitance value; and based on the electric double layer capacitance values corresponding to the plurality of charging voltages respectively, judging whether lithium precipitation occurs in the battery or not. The detection method provided by the invention is simple and convenient to operate, accurate in detection result and suitable for batteries of various material systems, particularly has remarkable advantages in the aspect of improving the applicability and accuracy of detecting the lithium precipitation phenomenon, and can be widely applied to the field of battery quality detection.

The invention relates to a controllable electrochemical etching strategy based on solubility product difference, in particular to a preparation method of a barium sulfate modified NiCo-LDH aqueous alkaline zinc battery positive electrode material, which comprises the following steps: firstly, dissolving 1, 4-phthalic acid and sodium hydroxide in a molar ratio of 1: 2 in water to obtain a solution A; dissolving barium nitrate pentahydrate, cobalt nitrate hexahydrate, nickel nitrate hexahydrate and ammonium fluoride in water according to a molar ratio of (0-1.5): 1: 4: 10 to obtain a solution B; the preparation method comprises the following steps: fully mixing the solutions, transferring the mixed solution into an autoclave containing foamed nickel (NF), and carrying out solvothermal reaction to obtain a tri-metal Co / Ni / Ba-MOF precursor (CNBx-BDC); cNBx-BDC is used as a working electrode, a platinum wire is used as a counter electrode, Hg / HgO is used as a reference electrode, 5-6M potassium hydroxide and 0.05-0.06 M sodium sulfate are used as electrolyte, a three-electrode system and a cyclic voltammetry method are adopted, electrochemical etching is carried out at the scanning rate of 20-30mV s <-1 > under the voltage range of 0-0.5 V, and the barium sulfate nanodot functionalized Co / Ni / Ba-LDH electrode (BS (at) CN-LDH) is obtained after six times of circulation. The unique porous structure can provide more electrochemical active sites and enhance electrolyte infiltration capacity, and the constructed heterostructure forms a strong built-in electric field, accelerates charge transfer, reduces ion diffusion energy barriers and improves energy utilization efficiency.

The invention discloses an ammonia nitrogen electrochemical sensitive electrode based on a platinum-zinc-copper ternary alloy and a preparation method thereof, and belongs to the technical field of electrochemical sensing. The preparation method comprises the following steps: firstly, dissolving platinum salt, copper salt and zinc salt in deionized water according to a certain proportion to prepare a precursor solution for electrodeposition; and then, constructing a three-electrode system by taking the cleaned carbon cloth substrate as a working electrode, a platinum sheet as a counter electrode and Ag / AgCl as a reference electrode, and depositing a platinum-zinc-copper ternary nano-alloy sensitive material on the carbon cloth substrate through an electrochemical cyclic voltammetry to obtain the ammonia nitrogen electrochemical sensitive electrode based on the platinum-zinc-copper ternary alloy. Finally, the electrode is used for sensitive detection of ammonia nitrogen in water. The detection performance of the platinum-zinc-copper ternary alloy electrode on ammonia nitrogen is superior to that of a sensitive electrode of the same type, and the platinum-zinc-copper ternary alloy electrode has the advantages of low cost, high sensitivity, wide linear range, low detection limit and the like, shows good repeatability and interference resistance, and can realize rapid detection and real-time monitoring on ammonia nitrogen in water.

The invention discloses a method for quantifying the number of active sites on a three-phase interface of an M-N-C material, which comprises the following steps: carrying out cyclic voltammetry (CV) test in a humidified H2 / N2 atmosphere, activating, and removing surface impurities; changing the potential interval to be [-0.5 V, 0.2 V] and the scanning speed to be 10mV. S <-1 >, and collecting a background curve; cathode gas is switched into NO / N2 mixed gas, and the gas flow rate is controlled to be 0.2 L.min <-1 >; the cathode gas is switched to N2 again, and purging is conducted for 30 min at the gas flow rate; the NO is fully saturated and adsorbed on the Fe site; switching cathode gas into N2, adjusting the flow rate to 0.2 L.min <-1 >, and collecting an NO desorption curve; by calculating the reduction electric quantity, the number of active sites of the M-N-C material under actual conditions of a fuel cell can be obtained, and more reliable data support is provided for performance optimization of a fuel cell catalyst.

The present invention relates to a layered composite electrode and its preparation method and application. The electrode uses nickel foam as the base layer, grows a layer of manganese phosphide on its surface by hydrothermal method, and then deposits Co oxide on the surface of the manganese phosphide layer by cyclic voltammetry (CV) electrodeposition technology. After cleaning and drying, Co z O / Mn y P x The catalyst on the surface of the / NF electrode presents a nanosheet structure. The Mn x The lattice of P nanomaterials is distorted and its electronic structure is optimized, which increases the oxygen vacancy content and thus improves the oxygen evolution performance of the catalyst.

The invention provides a method for detecting the concentration of an additive in an acid copper plating solution under double working electrodes and application of the method in detection of a copper foil plating solution. The method comprises the following steps: S1, preparing a series of standard plating solutions, wherein the standard plating solutions comprise a basic plating solution and an additive; s2, establishing a standard working curve: respectively placing each electrode of an electrochemical device containing double working electrodes of a micro-disk electrode and a micro-concave electrode into a series of standard plating solutions, and respectively testing the dissolution electric quantity Q or the dissolution peak current I on the micro-disk electrode and the micro-concave electrode by using a cyclic voltammetry dissolution method, establishing a standard working curve of the dissolution electric quantity ratio or the dissolution peak current ratio of the micro-disk electrode and the micro-concave electrode and the concentration of the additive to be detected; and S3, detection of the plating solution to be detected: substituting the dissolution electric quantity ratio or the dissolution peak current ratio of the plating solution to be detected at a certain moment into the standard working curve in the step S2 to obtain the concentration of the additive to be detected. According to the invention, online real-time monitoring can be realized, a reference solution does not need to be arranged, and the monitoring efficiency is higher.

The invention provides a micro-nano porous multi-principal element alloy material, a preparation method thereof and application of the micro-nano porous multi-principal element alloy material in electro-catalysis cinnamyl aldehyde hydrogenation. The preparation method of the micro-nano porous multi-principal element alloy material comprises the following steps: uniformly mixing three or more than four element raw materials of Co, Cr, Fe, Ni and Cu, and carrying out smelting, suction casting, cutting and annealing to obtain an alloy sheet; carrying out vacuum tube sealing on the alloy sheet and zinc particles, and carrying out a heating reaction to obtain a zincized principal element alloy; carrying out a metal Zn removal reaction in an argon-hydrogen mixed gas atmosphere to obtain a porous multi-principal-element alloy; and the porous multi-principal-element alloy is subjected to cyclic voltammetry treatment in a mixed solution of isopropanol and an acetic acid buffer solution, and the micro-nano porous multi-principal-element alloy material is obtained through washing and drying. The method is easy and convenient to operate, the production period is greatly shortened, and batch production capacity is achieved. The prepared porous multi-principal element alloy material shows excellent catalytic activity and stability in electro-catalysis cinnamyl aldehyde hydrogenation.

The invention belongs to the technical field of electrochemical analysis and detection, and particularly relates to an electrochemical immunosensor for detecting adiponectin as well as a preparation method and application of the electrochemical immunosensor. The preparation method comprises the following steps: (1) connecting a screen-printed electrode SPCE to an electrochemical workstation by using a 0.01 M PBS (Phosphate Buffer Solution) with the pH value of 7.4, performing-0.2 V-1. 2V cyclic voltammetry scanning, and activating for 10 circles under 50mV / S; and (2) by taking 0.01-1M H2SO4 as a base solution, connecting the screen-printed electrode SPCE to an electrochemical workstation, carrying out electro-polymerization on poly-o-phenylenediamine in a 50-100mM o-phenylenediamine and NH2-UiO-66 solution to form a poly-o-phenylenediamine and NH2-UiO-66 composite modified electrode, washing with deionized water, and drying at room temperature. (3) soaking the modified electrode in a glutaraldehyde solution for 10-70 minutes, cleaning with deionized water, drying at room temperature, adding 10-100 [mu] L of ADPN antibody solution and 100-600 [mu] g / mL of ADPN antibody solution, and incubating; and (4) washing with ionized water, drying at room temperature, preventing non-specific binding sites at 37 DEG C for 0.5-1.5 hours by using 3-10 microliters of 0.8-1.2 wt% casein solution, and washing the screen-printed electrode again to obtain the electrochemical immunosensor.

The invention provides a Pd-foamed nickel hydrogen evolution catalyst and a preparation method and application thereof.The preparation method of the Pd-foamed nickel hydrogen evolution catalyst comprises the following steps that a mixed solution containing sodium chloride and palladium chloride is used for conducting electric etching-deposition treatment on foamed nickel, and the Pd-foamed nickel hydrogen evolution catalyst is obtained; wherein the electric etching-deposition treatment is carried out by using a cyclic voltammetry method. According to the preparation method of the Pd-foamed nickel hydrogen evolution catalyst, the catalyst with low overpotential and high stability can be prepared, and the method has the advantages of being short in step, easy to operate, high in practical operability and the like.

The application relates to the technical field of calcium ion batteries, in particular to a preparation method of a Ca-I2 double-ion battery, which specifically comprises the following steps: (1) placing 5M CaCl2 aqueous solution as an electrolyte in an electrolytic cell; (2) placing elemental iodine and activated carbon fiber cloth in a sealed glass container to carry out iodine fixation, and the carbon fiber cloth after the iodine fixation is used as a positive electrode material; (3) obtaining an electrode sheet by drying the carbon fiber paper coated with slurry, and activating the fully dried electrode sheet through an electrochemical cyclic voltammetry method, and the activated electrode sheet is used as a negative electrode material; and (4) placing the positive electrode material and the negative electrode material in the electrolyte together, and obtaining the Ca-I2 double-ion battery through matching, wherein the preparation method of the Ca-I2 double-ion battery shortens the diffusion distance of calcium ions by half, and the positive electrode carries out a rapid oxidation-reduction reaction, so that the whole battery has good rate performance, high power density and energy density.

The invention provides a V10-coated FeCo-MIL / BiVO4 composite photo-anode based on dissociation reconstruction interface strengthening as well as a preparation method and application of the V10-coated FeCo-MIL / BiVO4 composite photo-anode. According to the photoanode, BiVO4 loaded on FTO conductive glass serves as a substrate, V10 nanoclusters and a FeCo bimetal organic framework (FeCo-MIL) are synchronously loaded on the surface of the BiVO4 through a one-step solvothermal reaction, and a ternary composite structure is formed. The core innovation of the invention lies in that the composite photoanode is subjected to electrochemical activation treatment by adopting cyclic voltammetry subsequently, and FeCo-MIL is induced to generate controllable dissociation and dynamic reconstruction, so that strong interface interaction is constructed between FeCo-MIL and V10 and BiVO4, and an efficient charge transfer channel is formed. The material is simple in preparation process and low in cost, and shows excellent performance in the field of photoelectrocatalytic water decomposition. Under the irradiation of AM 1.5 G simulated sunlight and the potential of 1.23 V vs. RHE, the initial photocurrent density can reach 5.0 mA cm <-2 >, after cyclic voltammetry activation treatment, the photocurrent density is further increased to 5.8 mA cm <-2 >, the operation stability is enhanced, and the photoelectrocatalytic activity is remarkably enhanced.

The invention relates to preparation and application of a foam metal electrode loaded with a polymer film, and relates to a key technology of the foam metal electrode loaded with the polymer film for detecting NADH (Nicotinamide Adenine Dinucleotide Horse), which comprises the following steps: by taking foam metal as a substrate, electrically polymerizing the polymer film on the substrate in a cyclic voltammetry mode to obtain the foam metal electrode loaded with the polymer film; nADH with different concentrations is detected by using the NADH as a working electrode, Pt as a counter electrode and saturated calomel as a reference electrode. The invention provides a rapid and sensitive method for electrochemically detecting NADH by virtue of good conductivity, large specific surface area and high porosity of the foam metal and high stability and NADH catalysis capability of the conductive polymer and loading the conductive polymer on the surface of the foam metal. The preparation method of the foam metal electrode loaded with the polymer film, provided by the invention, has the advantages of high efficiency, simplicity in operation, obvious effect, low cost and the like, and can be applied to the field of electrochemical sensing.

The invention provides an Ag-CuO / Cu electrode, a preparation method and passion fruit juice detection application, and the preparation method comprises the following steps: cleaning a copper electrode, and then grinding and polishing; the copper electrode obtained after primary treatment is immersed in a 0.5-1.5 M H2SO4 solution, square wave pulse treatment is carried out, and a pretreated copper electrode is obtained; the pretreated copper electrode is placed in a 0.5-1.5 M KOH solution, cyclic voltammetry scanning is carried out, and an activated copper electrode is obtained; and the activated copper electrode is placed in a 0.005-0.05 M AgNO3 solution, and Ag < + > is reduced and deposited on the surface of the copper electrode by adopting a constant potential deposition method to form an Ag modification layer. The Ag-CuO / Cu electrode prepared by the invention is used for detecting ascorbic acid in passion fruit juice, and is high in sensitivity, good in repeatability and reproducibility, excellent in long-term stability and strong in anti-interference capability; and the electrode preparation process is simple.

The invention discloses a preparation method and application of a nickel-molybdenum polyacid-polymer-based self-supporting electrocatalyst with low platinum-carbon loading capacity, and relates to the technical field of electrocatalysts. The preparation method of the electrocatalyst comprises the following steps: weighing raw materials for preparing an electrolyte solution; comprising nickel sulfate, ammonium molybdate, chloroplatinic acid, borax, polyvinyl alcohol and chitosan. Uniformly mixing the raw materials with deionized water to obtain a nickel molybdenum polyacid solution, a borax solution and a PVA-CS solution, obtaining a target electrolyte solution, and soaking the target electrolyte solution with carbon paper; freezing and drying; performing carbonization; the treated carbon paper is used as a working electrode, a saturated calomel electrode is used as a reference electrode, and a graphite electrode is used as an auxiliary electrode; and platinum is electrodeposited on the carbon paper by adopting a cyclic voltammetry electrodeposition method to prepare the electrocatalyst. According to the prepared electrocatalyst, the cost can be reduced, the reaction kinetics of an alkaline solution and alkaline seawater can be improved, the overpotential can be reduced, the stability can be improved, and the alkaline seawater electrolysis process is more economical and efficient.

The application relates to an activation method of a high-loading manganese dioxide electrode material, in particular to in-situ growth of a high-loading manganese dioxide electrode material with a loading of greater than or equal to 15 mg cm ‑2 on a flexible carbon cloth surface, taking the high-loading manganese dioxide electrode material as a working electrode, taking a metal Pt sheet as a counter electrode, adopting a two-electrode system, activating the high-loading manganese dioxide in a zinc nitrate solution through cyclic voltammetry scanning, and the activated high-loading manganese dioxide exhibits excellent electrochemical properties. The application adopts an electric activation method to improve the electrochemical activity of the high-loading manganese dioxide, has the advantages of simple process, convenient operation and the like, and the activated high-loading manganese dioxide electrode material can be used for electrochemical energy storage.

This invention discloses a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid, its preparation method, and its application. The preparation method includes: S1, pretreating nickel foam (NF); S2, dissolving disodium hydrogen phosphate dodecahydrate and hexadecyltrimethylammonium bromide in a mixture of water and ethylene glycol, adding cobalt nitrate and stirring to obtain a precursor; S3, immersing the nickel foam in the precursor solution and refrigerating it overnight at low temperature; S4, transferring it to a reaction vessel and hydrothermally heating it at 160 °C for 10 hours to obtain cobalt phosphate (CoPO / NF); S5, using CoPO / NF as the working electrode, electrochemically depositing platinum in an H2PtCl6 and KOH electrolyte using cyclic voltammetry; S6, washing and vacuum drying to obtain the final product. This invention is the first to prepare a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid at 100 mA cm⁻¹. ‑2 With a working potential of only 0.67 V at current density (relative to RHE) and a Faraday efficiency of 100% for glycolic acid, it has significant advantages and application potential in the highly selective production of glycolic acid in the electro-oxidation reaction of ethylene glycol.

The application discloses a high-performance binder-free nanofiber membrane electrode and a preparation method and fuel cell thereof, and belongs to the technical field of fuel cells. The preparation method comprises the following steps: performing constant potential treatment on a single cell assembled by a nanofiber membrane electrode under the condition that air is passed through a cathode and hydrogen is passed through an anode, performing nitrogen blowing on the cathode and hydrogen blowing on the anode for a set time after the treatment is completed, then performing cyclic voltammetry scanning on the cathode and the anode under the condition that nitrogen is passed through the cathode and hydrogen is passed through the anode, and the high-performance binder-free nanofiber membrane electrode is obtained; wherein, a cathode catalytic layer of the nanofiber membrane electrode is prepared by an electrostatic spinning method. The preparation method can effectively remove the binder in the nanofiber membrane electrode, significantly improves the utilization rate and catalytic activity of the catalyst and the working performance of the membrane electrode, and is simple and easy to operate.

The application discloses a method for photocatalytically preparing 3-aminoquinoxalin-2(1 H )-ketone compounds, and belongs to the field of organic synthesis. The application comprises the following steps: quinoxalin-2(1 H )-ketone compounds, fatty amine compounds, a photocatalyst mpg-C3N4 (mesoporous graphite phase carbon nitride) and an alkali DABCO (1,4-diazabicyclo (2.2.2) octane) are added into an organic solvent and uniformly mixed; the reaction is carried out under the irradiation of light in an oxygen atmosphere; and after the reaction is completed, the 3-aminoquinoxalin-2(1 H )-ketone product is obtained through treatment and separation. The application uses DABCO as an alkali and an electron transfer agent, and adopts mpg-C3N4 to photocatalytically prepare 3-aminoquinoxalin-2(1 H )-ketone compounds under the auxiliary condition of DABCO, and it is concluded from DABCO quenching experiments and cyclic voltammetry experiments that there is a single electron transfer relationship between them; and the application has the advantages of mild reaction conditions, simple operation and the ability to synthesize 3-aminoquinoxalin-2(1 H )-ketone compounds in one step.

The invention discloses an electrocatalytic oxygen reduction material as well as preparation and application thereof. According to the invention, by introducing a synergistic effect between Fe clusters and Fe-Co diatomic sites, the oxygen reduction reaction activity in the acidic electrolyte is remarkably improved, the half-wave potential (E1 / 2) of the acidic electrolyte in 0.1 M HClO4 reaches 0.835 VRHE, and after 10000 circles of accelerated cyclic voltammetry tests (0.6-1.0 V vs.RHE), the half-wave potential attenuation is less than 5 mV. The peak power density reaches 452 mW cm <-2 > under the condition of hydrogen-air (2 bar back pressure), and the peak power density is increased to 1.0 W cm <-2 > under the condition of hydrogen-oxygen (2 bar back pressure).

The invention discloses a cyclic voltammetry curve prediction method, device and equipment, a medium and a product, and relates to the technical field of battery performance prediction. The method comprises the following steps: constructing a first sample set and a second sample set based on a historical cyclic voltammetry curve; training the fusion model by using the first sample set and the second sample set to obtain an upper half curve prediction model and a lower half curve prediction model; and performing cyclic voltammetry curve prediction by using the upper half curve prediction model and the lower half curve prediction model. According to the method, the upper half curve prediction model and the lower half curve prediction model are obtained through sample construction and model training, the situation that prediction is difficult due to the fact that the same voltage corresponds to multiple currents can be avoided, the cyclic voltammetry curve change is accurately predicted through an efficient data driving method, and the accuracy of cyclic voltammetry curve prediction is improved. Therefore, evaluation and optimization of the service life of the fuel cell are realized.

The application discloses a kind of solubility carbon black electron transfer capacity quantitative prediction method, more than three temperature is selected and is prepared carbon black using biomass, is configured into mixed solution by adding water, mixed solution is cultured by shaker, solution is centrifuged, supernatant is filtered, and solubility carbon black solution is obtained;The concentration of solubility carbon black solution is determined, and the cyclic voltammetry curve of carbon black solution is determined using electrochemical workstation and three electrode system, the peak potential corresponding to each scanning speed in the curve, peak current are obtained, according to scanning rate, peak potential, peak current, solubility carbon black solution concentration, electron transfer rate constant k 0 It is calculated by using Bulter-Volmer equation, linear prediction model is constructed by the logarithmic value of electron transfer rate constant k 0 And pyrolysis temperature, the electron transfer capacity of carbon black at different temperatures is predicted using the model;The method is simple and easy to operate, and the electron transfer capacity of solubility carbon black of known raw material type can be directly predicted.

This invention relates to the field of energy storage device technology and provides a method for preparing a high-specific-capacitance hydrated ruthenium oxide cathode material, comprising the following steps: annealing RuO2·xH2O; preparing a slurry by mixing RuO2·xH2O powder with a binder and a conductive agent, stirring, coating it onto carbon paper, and vacuum drying; using a three-electrode system, with the dried carbon paper loaded with RuO2·xH2O powder as the working electrode, performing an activation process, wherein the activation method is one of constant current intermittent titration activation, cyclic voltammetry activation, and constant current charge-discharge activation. This invention also provides a high-specific-capacitance hydrated ruthenium oxide cathode material and its application. This invention lowers the annealing temperature, reducing some of the crystal water in the hydrated ruthenium oxide to a suitable level; then, by using electrochemical constant current intermittent titration cycles to reduce the crystallinity of the hydrated ruthenium oxide, electron transport and ion transport reach the most coordinated state, thereby improving the specific capacitance of the cathode material.