45 results about "Cyclic voltammetry" patented technology

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 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 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.

The application discloses a Ce, Nd-MOF-5 / GO / PANI composite material, a preparation method and application thereof. A MOF-5 doped with double rare earth elements is modified as a skeleton, a three-dimensional conductive network is constructed by being combined with graphene oxide, and polyaniline with high conductivity is polymerized by using an in-situ polymerization method. The electrochemical behavior of the composite material is analyzed by performing a cyclic voltammetry test, and the significant advantages of the ternary composite structure in improving the electrode conductivity, promoting the reaction kinetics and enhancing the structural stability are verified, and the ternary composite structure is finally applied to a full vanadium redox flow battery.

The invention discloses a platinum-loaded boron-doped diamond electrode, which is characterized in that monocrystalline silicon is pretreated by using a diamond grinding liquid to obtain seeded monocrystalline silicon, and the seeded monocrystalline silicon is used as a substrate to prepare a boron-doped diamond film electrode by using a hot filament chemical vapor deposition method; then loading platinum by using an atomic layer deposition method, then putting into an acidic electrolyte, connecting an electrochemical workstation by using a standard three-electrode system, and carrying out cyclic voltammetry scanning to obtain a platinum-loaded boron-doped diamond electrode; the potential window of the boron-doped diamond film electrode is remarkably improved, the background current is reduced, and the boron-doped diamond film electrode has wide application prospects in the fields of electrocatalysis, electrochemical sensing, advanced oxidation and the like.

The invention belongs to the technical field of environmental materials, and particularly relates to a method for electrodeposition-assisted biosynthesis of a silver-based catalytic material SSSM-SRB and application of the silver-based catalytic material SSSM-SRB. The invention relates to a method for electrodeposition-assisted biosynthesis of a silver-based catalytic material SSSM-SRB, which comprises the following steps: by taking a sulfate reducing bacteria (SRB) suspension as an electrolyte and a silver net as a working electrode, carrying out electrodeposition by adopting a cyclic voltammetry, and growing Ag2S on the surface of the silver net in situ. The SRB is used for biologically synthesizing Ag2S, the process is environmentally friendly, and use of toxic reagents in traditional chemical synthesis is avoided.

The invention discloses a hepatic fibrosis organ chip sensing device for pathological evaluation and drug screening, which belongs to the technical field of microfluidics and comprises a top cover, an upper culture layer, a porous membrane, a lower culture layer and a glass substrate electrochemical electrode. The sensing device is combined with a hepatic fibrosis organ chip and a three-electrode detection system, gel permeability change is detected on the basis of electrochemical cyclic voltammetry, the hepatic fibrosis process is indirectly evaluated, and then in-vitro rapid screening of hepatic fibrosis potential drugs is carried out. The liver fibrosis organ chip sensing device provided by the invention provides a novel and efficient research means for real-time monitoring and quantitative evaluation of a liver fibrosis in-vitro model. The problems that in the prior art, due to the fact that dynamic and cross-scale substance transmission characteristics in a precise quantification three-dimensional tissue model are still limited, microenvironment changes dominated by extracellular matrix reconstruction are difficult to reflect in a non-invasive and in-situ mode, and the hepatic fibrosis process is difficult to detect are solved.

The application discloses a synthesis method of an electrochemically reconstructed boron-doped nickel phosphide nanomaterial and applies the boron-doped nickel phosphide nanomaterial to water electrolysis hydrogen evolution under alkaline conditions, and excellent catalytic performance is obtained. The application mainly dopes boron elements in a precursor Ni(OH)2, generates Ni5P4-B through phosphorization treatment, and then forms Ni3(BO3)2 / Ni5P4 through electrochemical reconstruction. After preliminary hydrothermal synthesis of Ni(OH)2 nanosheets, the precursor with the nanosheets is suspended in ice water, and ice water solutions of different concentrations of NaBH4 are dropped to prepare boron-doped Ni(OH)2. The boron-doped Ni(OH)2 precursor is heated and phosphorized in a tube furnace, the sample after phosphorization is fully activated through electrochemical cyclic voltammetry, and a heterostructure Ni3(BO3)2 / Ni5P4 is obtained. The heterostructure Ni3(BO3)2 / Ni5P4 exhibits outstanding electrocatalytic hydrogen evolution activity under alkaline conditions.

The invention provides a nanocrystalline diamond heterojunction ultraviolet photoelectric detector, which is characterized in that seed crystal pretreatment is carried out on monocrystalline silicon, the obtained seed crystal monocrystalline silicon is used as a substrate, acetone is used as a carbon source, boron-doped nanocrystalline diamond is grown on the surface of the substrate by using a hot filament chemical vapor deposition method, the boron-doped nanocrystalline diamond is placed in a sulfuric acid solution, and the boron-doped nanocrystalline diamond heterojunction ultraviolet photoelectric detector is obtained. And performing cyclic voltammetry treatment. Then, the titanium source precursor is partially covered and placed in atomic layer deposition equipment, and deposition circulation is conducted through the titanium source precursor; and finally, the diamond and Ti areas are coated with silver paste to form an ohmic contact electrode, and the prepared nanocrystalline diamond heterojunction ultraviolet photoelectric detector has excellent response speed, can better adapt to high-speed ultraviolet detection tasks and shows good application prospects in the fields of ultraviolet communication, rapid switch monitoring and the like.

The invention discloses a high-mobility n-type nano-diamond film, which is characterized in that seed crystal pretreatment is carried out on monocrystalline silicon, the obtained seed crystal monocrystalline silicon is used as a substrate, acetone is used as a carbon source, and a hot filament chemical vapor deposition method is utilized to grow a nano-diamond film on the surface of the substrate; and placing the nano-diamond film in an acidic electrolyte, connecting the nano-diamond film with an electrochemical workstation, and performing cyclic voltammetry scanning to obtain the high-mobility n-type nano-diamond film. The n-type mobility of the thin film is improved from 158 cm < 2 > V <-1 > s <-1 > to 735 cm < 2 > V <-1 > s <-1 >, the process is simple and convenient, implementation is easy, and the method has important significance on n-type doping of diamond and application of the diamond in the field of electronic devices.

The application provides a composite negative electrode active material and a preparation method thereof, a negative electrode sheet containing the composite negative electrode active material, a secondary battery and an electric device. The composite negative electrode active material comprises a negative electrode active material matrix and a conductive polymer layer on the surface of the negative electrode active material matrix, wherein the composite negative electrode active material has an oxidation peak in the range of 3.2V-3.6V and a reduction peak in the range of 2.1V-2.6V in a cyclic voltammetry curve. The composite negative electrode active material provided by the application can balance low volume expansion, high specific capacity and high initial coulomb efficiency, and thus can make the secondary battery balance low volume expansion, high energy density and long cycle life.

The application discloses a method for measuring the electron transfer speed of dissolved organic matter in soil, and comprises the following steps: taking soil samples from wetland shallow soil, one layer every 2 cm, and taking more than three soil samples in total; adding the soil samples into ultrapure water to configure a suspension liquid; extracting dissolved organic matter in the soil suspension liquid by means of a shaking table oscillation, centrifugation and membrane filtration; obtaining an organic matter solution; using a three-electrode system and connecting an electrochemical workstation at room temperature; obtaining parameters such as peak current and peak potential by means of a cyclic voltammetry method; combining the concentration of the dissolved organic matter and the average molecular weight of the dissolved organic matter; and calculating the electron transfer rate constant k of the soil sample according to a Butler-Volmer equation. 0 The arithmetic mean of more than three electron transfer rate constants k 0 is calculated to represent and quantify the electron transfer speed of the dissolved organic matter in the surface layer of the wetland. The application has the advantages of simple process, convenient operation and specific quantification of the electron transfer speed of the dissolved organic matter in the shallow soil of the wetland.

The invention provides a preparation method and electrochemical performance of an intercalated black phosphorus-lithium-sulfur battery material, and the preparation method comprises the following steps: inserting Li < + > between black phosphorus layers by adopting a liquid phase intercalation method, preparing the intercalated black phosphorus-lithium-sulfur battery material by adopting a ball milling method, forming a coating on the surface of an LPSC electrolyte material, and constructing a lithium ion transmission channel, so as to obtain the intercalated black phosphorus-lithium-sulfur battery material. The ionic conductivity and the stability of the composite material are improved; the ionic conductivity of the intercalated black phosphorus-lithium-sulfur battery material is 80% higher than that of an LPSC material, no obvious oxygenolysis phenomenon occurs in a cyclic voltammetry test, the LPSC material has obvious oxygenolysis under 2.2 V and 2.82 V, and the stability of the composite material is excellent.

The invention provides a coordination regulation and control type high-stability aqueous organic flow battery adaptive to thermal power energy storage frequency modulation and a preparation method of the coordination regulation and control type high-stability aqueous organic flow battery. The preparation method comprises the following steps: adding deoxidized deionized water into an organic anode active material and an anode coordination regulator, introducing inert gas, carrying out stirring treatment, adding a pH regulator to regulate the pH value of the solution, and carrying out stirring treatment to form an anode electrolyte; adding deoxidized deionized water into an organic cathode active material and a cathode coordination regulator, introducing inert gas, stirring, adding supporting electrolyte, and stirring to form cathode electrolyte; immersing an ion exchange membrane into the modification liquid, and stirring to obtain a modified membrane; soaking the modified membrane in an alkali metal solution to activate ion exchange sites; the method comprises the following steps: immersing an electrode into a doping solution for dispersion treatment, drying to obtain a doped electrode, and carrying out cyclic voltammetry activation in an H2SO4 solution by taking the doped electrode as a working electrode, a platinum sheet as a counter electrode and a saturated calomel electrode as a reference electrode.

The present application relates to electrochemistry and chemical engineering application fields, and in particular to a method for removing heterogeneous metal oxide deposition layer on the surface of noble metal. The method for removing heterogeneous metal oxide deposition layer on the surface of noble metal provided by the present application comprises the following steps: taking noble metal with heterogeneous metal oxide deposition layer on the surface as a working electrode, and setting a counter electrode and a reference electrode; making the side with the heterogeneous metal oxide deposition layer of the working electrode contact with an electrolyte, while making the counter electrode and the reference electrode form conductive contact with the electrolyte; and applying voltage by cyclic voltammetry to perform electrochemical treatment, so that the heterogeneous oxide deposition layer is removed. The three-electrode method and the cyclic voltammetry can effectively and at low cost remove the heterogeneous metal oxide deposition layer on the surface of noble metal.

The invention provides a fuel cell circulation cold start damage macro-micro correlation defining method and system, and belongs to the technical field of fuel cell performance detection.The method comprises the following steps that firstly, the system is initialized, and original samples of a gas diffusion layer and a catalyst layer are obtained; calibrating the initial water content of the battery through electrochemical impedance spectroscopy; carrying out freeze-thaw cycle accelerated stress tests for not less than 3 times; performing electrochemical impedance spectroscopy and cyclic voltammetry test in the middle and later periods of the cycle, and calculating the electrochemical activity surface area to quantify the catalytic activity attenuation; disassembling the battery after the test, and quantifying a microcosmic damage index; and finally, establishing a quantitative correlation model of the macroscopic performance and the microscopic damage, dividing the damage into a slight type, a moderate type and a serious type according to a threshold value, and outputting a defining result. According to the method, macro-micro accurate association, quantitative evaluation and grading of the circulating cold start damage of the proton exchange membrane fuel cell are realized, and the method has the outstanding advantages of clear mechanism, standard process, high engineering practicability and the like.

A separator, a secondary battery cell, a battery device, and an electric device. The secondary battery cell comprises a positive electrode sheet, a negative electrode sheet, and a separator. The separator is provided between the positive electrode sheet and the negative electrode sheet. The separator comprises a porous base film and a coating located on at least one side of the porous base film, wherein the coating comprises organic particles, with the cyclic voltammetry curve of the first cycle of the organic particles not having an oxidation peak within a voltage range of 2.50 V to 4.40 V. The secondary battery cell has good capacity performance characteristics under a high pressure.

The invention belongs to the technical field of supercapacitor electrode materials, and relates to an all-solid-state supercapacitor based on a CuCo2O4-PDMT composite electrode and a preparation method thereof.The preparation method comprises the steps that copper nitrate and cobalt nitrate serve as metal sources, and a CuCo2O4 bottom layer is prepared through constant-potential electro-deposition-muffle furnace annealing; 2, 5-dimethylthiophene (DMT) is used as a monomer, a PDMT top layer is prepared through cyclic voltammetry electropolymerization, and a CuCo2O4-PDMT composite electrode is formed; polyethylene glycol (PEG) is used as a gel matrix, lithium perchlorate (LiClO4) is used as an ion source, nano TiO2 is used as a reinforcing agent, and the composite gel electrolyte is prepared through'microwave dissolution-ultraviolet curing '. The composite electrode and the gel electrolyte are assembled into the all-solid-state symmetrical supercapacitor, so that the defects of high electrode electron transmission impedance, low gel electrolyte ion conductivity and insufficient cycling stability of the existing all-solid-state supercapacitor are overcome, and the collaborative construction of the composite electrode conductive network and the gel electrolyte ion channel is realized; and the performance limitation of traditional single component optimization is broken through.

The invention relates to the technical field of analytical chemistry, and relates to a method for testing ion activity in a solution, the method comprises the following steps: preparing a reference solution and a working solution, the reference solution and the working solution comprise a solvent, a reference substance with redox activity and a salt, and the cation element of the salt comprises a metal element A; preparing a working electrode and a counter electrode, wherein the material of the counter electrode comprises metal A; performing cyclic voltammetry test on the working electrode and the counter electrode in the working solution to obtain working potential E1; performing cyclic voltammetry test on the working electrode and the counter electrode in the reference solution to obtain a reference potential E2; and calculating the activity a1 and a2 of the metal ions of the working solution A according to an equation, wherein the activity a1 and a2 are the activity of the metal ions of the reference solution A, R is a gas constant, T is temperature, z is the charge number in the battery reaction, and F is a Faraday constant. According to the test system, the working electrode and the counter electrode are tested in the single-phase solution, so that the test accuracy is improved.

The present application relates to the technical field of electro-synthesis of hydrogen peroxide, and particularly relates to a tungstate nanomaterial, a preparation method thereof and application of the tungstate nanomaterial in electro-synthesis of hydrogen peroxide. The tungstate nanomaterial provided by the present application can be directly used as a catalyst, and the active component of the catalyst is a transition metal tungstate nanomaterial. The catalyst has stable structure, no carbon active center, avoids carbon corrosion problem and has excellent electrochemical stability. The tungstate nanomaterial provided by the present application has H2O2 selectivity of more than 83% in an alkaline medium, and the H2O2 selectivity does not attenuate after 20000 cycles of cyclic voltammetry test. The catalyst is one of the catalysts with the best performance in electrochemical oxygen reduction synthesis of H2O2 in an alkaline medium. The tungstate nanomaterial provided by the present application has advantages of excellent stability, high H2O2 selectivity and low cost when used as a catalyst in electrochemical oxygen reduction synthesis of H2O2, and has important significance for promoting the development of electrochemical oxygen reduction synthesis of H2O2.

This invention belongs to the field of fuel cell technology and discloses a methyl viologen-dopamine polymer enzyme-mimicking catalytic electrode, its preparation method, and its application in glucose fuel cells. The methyl viologen-dopamine polymer enzyme-mimicking catalytic electrode was prepared using a continuous cyclic voltammetry-driven methyl viologen-dopamine redox co-assembly method. The preparation method is simple and allows for easy control of deposition amount and degree of polymerization. The prepared electrode not only exhibits outstanding glucose oxidase-mimicking activity for glucose oxidation but also demonstrates good electrocatalytic activity for oxygen reduction. Glucose fuel cells assembled using methyl viologen-dopamine polymer as both anode and cathode catalysts exhibit high open-circuit voltage and power density. The assembled fuel cells do not require precious metal catalysts or enzyme catalysts, and are characterized by simple operation, environmental friendliness, safety, and high efficiency.

The application discloses a foam nickel loaded bimetallic phosphide / sulfide heterostructure hydrogen evolution catalyst and a preparation method thereof. Different from a preparation method of a general high-temperature phosphorization or sulfuration treatment corresponding precursor, the application adopts a mild and simple two-step electrodeposition method, taking nickel salt and cobalt salt as metal sources, taking thiourea as a sulfur source, and taking sodium hypophosphite as a phosphorus source. First, foam nickel with good conductivity is selected as a substrate, and nickel cobalt sulfide nanosheet arrays are directly grown on the foam nickel through cyclic voltammetry electrodeposition; then, nickel cobalt phosphorus nanoparticles are in-situ coated on the surface of the nickel cobalt sulfide nanosheet to obtain an electrocatalytic hydrogen evolution catalyst with a layered heterostructure. The catalyst prepared by the method has low cost, and also exhibits excellent alkaline electrocatalytic hydrogen evolution performance under a large current density, and has great potential in actual large-scale hydrogen production.

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 invention discloses a preparation method of a vanadium battery electrode, and belongs to the technical field of vanadium battery processing. The preparation method comprises the following steps: S1, selecting a carbon felt as a base material, and selecting nanoscale titanium dioxide and graphene as composite modified materials; s2, pretreating the carbon felt, removing impurities on the surface of the carbon felt through pretreatment, and increasing surface active sites of the carbon felt; s3, the pretreated carbon felt serves as a substrate, a spinning solution containing titanium dioxide and graphene is evenly sprayed to the surface of the carbon felt through electrostatic spinning equipment, then the carbon felt obtained after spinning is completed is put into a hot-pressing mold to be subjected to hot pressing, and an electrode primary product is obtained after hot pressing is completed; s4, the primary electrode product is put into plasma treatment equipment for plasma surface modification, and a finished electrode product is obtained; and S5, testing the conductivity, cyclic voltammetry and durability of the electrode finished product. According to the scheme, the problem that an existing vanadium battery electrode processing method is large in energy consumption is solved.