201 results about "Charge transfer resistance" patented technology

The invention discloses a method for testing polarization and decoupling of a flow battery. The method aims to quantify and separate three phenomena of ohmic polarization, activation polarization and concentration polarization in the flow battery. Comprising the following steps: firstly, carrying out electrochemical impedance spectroscopy testing under open-circuit voltage and different working currents respectively to obtain ohmic resistance and charge transfer resistance, and carrying out integral calculation to obtain ohmic polarization and activated polarization; then, carrying out a step type constant current charging test to obtain a total polarization curve; and finally, subtracting the ohmic polarization and the activation polarization from the total polarization to obtain concentration polarization. The method is simple and convenient to operate and suitable for various types of flow batteries, a novel and effective solution is provided for polarization analysis of the flow batteries, an accurate test basis can be provided for optimization of battery design, and improvement of performance optimization and research level of the flow batteries is facilitated.

The invention relates to the technical field of aircraft part processing, testing or inspection and the like, and provides an aircraft aluminum alloy plate aging evaluation method based on an equivalent circuit model, and the method comprises the following steps: collecting electrochemical impedance spectrums of samples with different exposure age limits, and extracting electrochemical impedance spectrum characteristics of the samples; establishing an equivalent circuit model comprising solution resistance, coating resistance, coating capacitance, Warburg impedance, anodic oxide film charge transfer resistance, interface capacitance, aluminum alloy matrix charge transfer resistance, interface electric double-layer capacitance, inductance and corresponding resistance of the inductance based on the characteristics, wherein the equivalent circuit model comprises the solution resistance, the coating resistance, the coating capacitance, the Warburg impedance, the anodic oxide film charge transfer resistance, the interface capacitance, the aluminum alloy matrix charge transfer resistance and the interface electric double-layer capacitance; and analyzing a resistance curve and a capacitance curve obtained by fitting the model to complete the evaluation of the corrosion and aging degree. According to the method, systematicness and accuracy of aging evaluation are improved, an electrochemical mechanism in the corrosion process can be disclosed, time correlation modeling of the aging process can be achieved, and the method is suitable for long-term service performance monitoring and service life prediction of the aviation aluminum alloy structure.

The invention discloses a lithium battery solid electrolyte interface film forming quality evaluation method. The method comprises the following steps: in a lithium battery formation stage or a circulation process, applying an alternating current disturbance signal with an amplitude of 1-20mV, and collecting full-band electrochemical impedance spectroscopy data in real time; a relaxation time distribution method is adopted to decouple the electrochemical impedance spectrum of the intermediate frequency region; constructing an equivalent circuit model containing SEI film characteristics, and fitting the decoupled electrochemical impedance spectrum curve by the equivalent circuit model; the compactness index of the SEI film is calculated according to the SEI film resistance and the film capacitance, and whether the compactness of the SEI film reaches the standard or not is judged according to the compactness index; and calculating a lithium ion diffusion coefficient by combining the charge transfer resistance and the Warburg diffusion impedance, and evaluating the SEI membrane ion transmission efficiency. According to the invention, non-destructive monitoring is supported, quantitative evaluation of SEI membrane compactness, ionic conductivity and short circuit faults in the module can be realized, and the cycle life and safety of the lithium battery are improved.

The invention discloses a low-temperature exposed lithium battery aging damage diagnosis method based on electrochemical nondestructive characterization, which comprises the following steps: firstly, acquiring electrochemical response data of a to-be-tested battery through electrochemical impedance spectroscopy (EIS) test and incremental capacity analysis (ICA); secondly, key characteristic parameters capable of representing ohmic internal resistance, charge transfer resistance and electric double-layer capacitance of the battery and phase change peak position, peak area, half-peak width and the like are extracted; and then, training a joint prediction model based on machine learning by using the extracted multi-dimensional features to judge whether the to-be-detected battery is subjected to over-low-temperature exposure or not and judge the current aging damage degree of the to-be-detected battery. According to the method, unique aging paths introduced by normal aging and low-temperature exposure can be effectively distinguished through a nondestructive testing means, accurate'traceability 'of historical damage of the battery and quantitative evaluation of the current state are achieved, and reliable technical support is provided for intelligent decision making of a battery management system (BMS), battery safety early warning and echelon utilization.

The invention discloses a working condition monitoring method for a sodium ion battery sodium precipitation behavior based on battery impedance analysis. The core principle of the method is based on the following points: when sodium precipitation occurs, sodium metal is deposited on the surface of hard carbon, so that the physical and chemical properties of the surface of the hard carbon can be changed; the conductivity of sodium metal is obviously different from that of a hard carbon material, so that the charge transfer resistance of hard carbon is obviously changed. In addition, the appearance of the sodium metal also causes the change of the electric double layer capacitance on the hard carbon surface; therefore, whether sodium metal begins to be separated out or not can be accurately judged by detecting the change of the charge transfer resistance and the electric double-layer capacitance on the hard carbon surface; according to the scheme, in-situ monitoring of sodium metal precipitation can be achieved under the condition that the battery structure is not damaged, the sodium metal precipitation situation of the sodium ion battery in the half-battery discharging process can be sensitively captured, and sodium metal deposition of the half battery, the full battery and the soft package battery under the actual operation condition can be monitored in real time.

The invention relates to the technical field of lithium ion batteries, in particular to a halogenated electrolyte modified low-impedance positive electrode and a preparation process and application thereof. The problem that an existing lithium ion battery positive electrode material is high in impedance is solved. According to the preparation method, the carbon-coated aluminum foil is used as the positive current collector, so that the positive current collector has relatively low contact resistance and relatively high adhesion, the charge transfer resistance and the internal resistance of the battery are reduced, and the rate capability and the cycle performance of the battery are improved; a positive active material is added, C6H12O6.H2O is adopted for carbon coating to improve the electron transmission capacity of lithium iron phosphate, titanium-vanadium co-doping synergistically improves the electron conductivity, and the electron conduction impedance is reduced; the halide solid electrolyte coats lithium iron phosphate to inhibit side reaction and reduce interface impedance; carbon nano tube coating inhibits particle aggregation and reduces charge transfer impedance; and the modified conductive agent and the modified binder are added, so that the lithium ion battery has higher cycling stability, electrochemical activity and lower impedance.

An electrocatalyst, a method of producing hydrogen gas by a hydrogen evolution reaction, and a method of producing oxygen gas by an oxygen evolution reaction. The electrocatalyst includes manganese oxide nanoparticles, and silver containing nanoparticles disposed on the manganese oxide nanoparticles, the silver-containing nanoparticles include a shell of silver tungstate disposed on a core of Ag. The electrocatalyst has an electrical resistivity of 0.50×107 ohm (Ω) to 6.0×107Ω, a charge transfer resistance of 325Ω to 450Ω, a Tafel slope of 55 mV / dec to 125 mV / dec, and an overpotential at 10 mA / cm2 of 0.05 mV to 200 mV.

The invention belongs to the technical field of water electrolysis hydrogen production, and particularly relates to a catalyst for water electrolysis hydrogen production and a preparation method and application thereof. The catalyst for hydrogen production through water electrolysis comprises a CuO / Cu2O heterojunction structure doped with a metal element X, wherein the metal element X is selected from nickel, iron or a composition of the nickel and the iron. According to the preparation method, a chemical bath deposition method and a thermal chemical treatment method are adopted, and the X-doped CuO / Cu2O heterojunction (X-CuO / Cu2O) rich in oxygen vacancies is constructed on foamy copper. The catalyst has excellent catalytic activity under an alkaline condition, has a small Tafel slope value in HER, OER and MOR reactions, and is fast in reaction kinetics; the charge transfer resistance is small in the water electrolysis process; the electrochemical surface area and the double-electric-layer capacitance Cdl are relatively large, and the electrochemical active area is large; and the stability is lasting, and constant electrolysis lasts for at least 48 hours.

The invention belongs to the technical field of micro-nano composite materials, and particularly relates to a preparation method and application of a multi-metal sulfide-expanded graphite composite material. The preparation method of the multi-metal sulfide-expanded graphite composite material comprises the following steps: recovering graphite negative electrodes of waste lithium ion batteries, constructing cross-linked porous three-dimensional expanded graphite through a controllable expansion strategy, uniformly loading multi-metal sulfide nanoparticles on the surface of the expanded graphite by adopting a hydrothermal method, and carrying out heat treatment to obtain the composite material. The three-dimensional grid structure of the expanded graphite not only provides uniformly dispersed anchoring points for the polymetallic sulfide nanoparticles, but also constructs a continuous conductive network. According to the heterogeneous interface engineering, the charge transfer resistance is reduced, and agglomeration and volume expansion of active substances in circulation are inhibited through the topological confinement effect. The polymetallic sulfide-expanded graphite composite material prepared by the method has good structural stability and electrical conductivity, and the cycling stability of a battery can be remarkably improved when the polymetallic sulfide-expanded graphite composite material is used as a battery material.

The invention provides a positive electrode material, a preparation method thereof and a battery, the positive electrode material comprises an inner core and a shell coating the inner core, the inner core comprises a lithium-rich manganese-based positive electrode material, and the shell comprises manganese dioxide and aluminum fluoride; the chemical formula of the lithium-rich manganese-based positive electrode material is xLi2MnO3. (1-x) LiMO2, M is transition metal, the transition metal comprises at least one of Ni, Co and Mn, and x is more than or equal to 0 and less than or equal to 1. The positive electrode material is a modified lithium-rich manganese-based positive electrode material and has relatively good structural stability and relatively low charge transfer resistance, so that the rate capability and the cycling stability of the battery can be effectively improved.

The present invention provides a positive electrode composite active substance and a lithium ion secondary battery in which a coating layer covers a surface of an oxide active substance, and a resistance loss due to the coating layer can be suppressed while generation of gas due to decomposition of a nonaqueous electrolyte solution is suppressed as compared with a conventional case. A positive electrode composite active substance constituting a part of a positive electrode of a lithium ion secondary battery using a nonaqueous electrolyte solution as an electrolyte, the positive electrode composite active substance including: an oxide active substance; and a coating layer covering a surface of the oxide active substance, in which the coating layer has lithium ion conductivity, and a grain boundary resistance of the coating layer is 3 times or more and 20 times or less larger than a charge transfer resistance of the oxide active substance.

The invention relates to the field of photoelectrocatalytic materials, and discloses a photoelectrocatalytic material and a preparation method and application thereof.The photoelectrocatalytic material is formed by a bismuth molybdenum oxide and nickel-doped cobalt oxide heterostructure, the surface plasma resonance effect of gold nanoparticles and a conductive network of nitrogen-doped graphene and carbon quantum dots are combined, and a graded micro-nano structure is constructed; according to the present invention, the material has characteristics of high light current density, low charge transfer resistance and excellent catalytic activity and long-term stability in liquid-phase degradation and gas-phase oxidation through the built-in electric field and the optimization of the conductive network, such that the material has characteristics of high light current density and low charge transfer resistance, and can be used in liquid-phase degradation and gas-phase oxidation. The material is widely applicable to the fields of pollutant degradation, gas conversion, water photoelectrolysis and the like, and an efficient solution is provided for innovative development of a photocatalysis technology.

The invention discloses an alloy structure optimization design manufacturing method and device, and the method comprises the steps: regulating and controlling an alloy microstructure, surface free energy parameters, a corrosion environment and stress boundary conditions through a numerical simulation method, and calculating the corrosion potential, corrosion current density and charge transfer resistance of an alloy under different conditions; establishing a quantitative relationship among the alloy microstructure, the surface free energy and the corrosion resistance; according to the target microstructure parameters, an alloy with a target microstructure is constructed through 3D printing; the super-hydrophobic alloy is prepared by utilizing a pretreatment condition and a fluorosilane modification condition; analyzing the influence rules of 3D printing conditions, pretreatment conditions and fluorosilane modification conditions on the microstructure, surface free energy and hydrophobicity of the alloy; and alloy preparation conditions are optimized according to the influence rule. Theoretical simulation and experiments are combined to clarify the internal relation among the construction method-microstructure and surface free energy-hydrophobicity-corrosion resistance of the corrosion-resistant alloy, and the corrosion resistance of the alloy structure is improved.

The invention discloses a palladium-doped Ir-Sn oxide titanium anode with high catalytic activity and a preparation method of the palladium-doped Ir-Sn oxide titanium anode, and belongs to the technical field of electrolytic anodes. The anode comprises a titanium substrate, a TiO2-Ta2O5 intermediate layer and an Ir-Sn-Pd oxide catalyst layer, the molar ratio of Ir to Sn to Pd in the catalyst layer is (5-6): 3: (1-2), and the total metal ion concentration is 0.3 mol L. The preparation method is realized through titanium substrate pretreatment (sand blasting and etching), intermediate layer coating sintering (a TiCl4-TaCl5 solution) and catalyst layer circulating coating sintering (an H2IrCl6-SnCl4-PdCl2 mixed solution). The relatively cheap palladium element is introduced, the electron structure of the catalyst layer is optimized by utilizing the defect effect, the charge transfer resistance is reduced to 6.7 omegacm, and meanwhile, the iridium consumption is reduced by more than 30%. Experiments show that the cell voltage of the anode is stabilized at 0.95 V (the current density is 5Acm <-2 >), the accelerated life reaches 1630 hours, the coating binding force is 62N, and the corrosion rate in an acidic electrolyte is only 0.01 mm / year. Compared with a traditional iridium tantalum anode, the cost is reduced by 40%, and the overpotential in the oxygen evolution reaction is as low as 0.45 V.

The invention relates to a microbial electrode online monitoring system and method based on multi-modal fusion and a self-repairing mechanism, and belongs to the technical field of environmental monitoring and bioelectrochemistry. Aiming at the problems of high cost, weak anti-interference capability, poor long-term stability, difficulty in precise decoupling of multi-parameter coupling and the like in the existing microbial electrode monitoring technology, the method comprises the following steps: synchronously acquiring multi-modal signals of a dual-wavelength differential near infrared spectrum and an electrochemical impedance spectrum; a front decoupling mechanism based on equivalent circuit fitting and reinforcement learning is combined to clearly distinguish change sources of charge transfer resistance and diffusion resistance; performing deep fusion on the decoupled features by using a convolutional neural network, and outputting a microbial activity score and a metabolite concentration; and a self-repairing electrode material and a closed-loop feedback control mechanism are introduced, and repairing is automatically triggered when electrode performance degradation is monitored. According to the invention, low-cost, high-precision and strong-anti-interference long-term stable in-situ monitoring of the microbial electrode is realized.

The invention belongs to the technical field of sodium ion batteries, and mainly relates to a multifunctional site co-doped high-rate multi-element iron-based phosphate positive electrode material, a preparation method thereof and a sodium ion battery. The chemical formula of the multi-functional-site co-doped high-rate multi-element iron-based phosphate positive electrode material is Na [4-(3 + n) y] Fe (3-x) Mgx (PO4) 2-y (A) yP2O7 / C, x is more than 0.001 and less than 0.05, y is more than 0.001 and less than 0.5, n is the valence state of doped anions, and is-2 or-4, and y is the valence state of doped anions. The doped anion element A is selected from one or more of a group consisting of SiO4 < 4->, SO4 < 2-> and CO3 < 2->. According to the positive electrode material, iron ions are partially replaced by magnesium ions, the transmission rate of sodium ions is increased, the interface charge transfer resistance is reduced, phosphate radicals are replaced by doped anions, the crystal structure of the material is stabilized, the stability of crystal lattices is enhanced, and the high-power discharge capacity of the material is improved.

The invention relates to the technical field of lithium ion batteries, in particular to a lithium iron phosphate positive plate as well as a preparation method and application thereof, and is used for solving the problems of relatively high resistance, relatively low conductivity and relatively poor peel strength of an existing lithium iron phosphate positive electrode material. According to the preparation method, a carbon-coated aluminum foil is used as a positive electrode current collector, the carbon-coated aluminum foil has relatively low contact resistance and relatively high adhesion and reduces charge transfer resistance and internal resistance of the battery, modified lithium iron phosphate is used as a positive electrode active substance, and a small amount of nickel ions are provided to enter lithium iron phosphate crystal lattices, so that special structure defects are generated in the crystals, and the lithium iron phosphate battery is obtained. The modified conductive agent and the modified binder are added into the lithium iron phosphate, so that the lithium iron phosphate battery has excellent cycle stability, the conductivity and the rate capacity of the battery are improved, and the impedance of charge transfer is reduced.

The invention provides a non-aqueous electrolyte and a lithium ion battery. The non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive. The additive comprises a compound A as shown in a structural formula I; wherein R1 and R2 are respectively and independently selected from oxygen, sulfur or NR5, R3 and R4 are respectively and independently selected from NR6R7, R5 is C1-C5 alkyl silicon group, and R6 and R7 are respectively and independently selected from C1-C5 alkyl silicon group, C1-C5 alkyl group, substituted C1-C5 alkyl group, phenyl or substituted phenyl. The compound A comprises a cyclic (oxygen, sulfur and nitrogen) phosphamide structure and a trimethylsilyl structure, the trimethylsilyl structure can remove moisture in the electrolyte, and the cyclic (oxygen, sulfur and nitrogen) phosphamide structure is reduced on a negative electrode interface to form a polar solid electrolyte interface film of lithium salt containing oxygen or sulfur and phosphorus and nitrogen; the interfacial film has good lithium ion conductivity and toughness, the charge transfer resistance of the lithium ion battery is reduced, desolvation of lithium ions is promoted, and the high-rate cycle performance of the lithium ion battery is improved. The structural formula I of the # imgabs0 # is shown in the specification.

The invention discloses a preparation method of nitrogen-oxygen co-doped modified biochar and biomass charcoal, and the method comprises the following steps: adding crushed biomass into a carbonate solution, uniformly mixing, drying, grinding into powder, and pyrolyzing in an inert gas atmosphere to obtain first biochar; washing and drying the first biochar, mixing the first biochar with a zeolite imidazole solution containing a metal salt, drying and grinding the mixture, mixing the mixture with melamine, and pyrolyzing the mixture in an inert gas atmosphere to obtain second biochar; the second biochar is washed and dried after being subjected to acid pickling, and the modified carbon nanotube biochar is obtained. Therefore, melamine pyrolysis gas is catalyzed to grow the carbon nanotubes on the carbon material, so that the charge transfer resistance of the carbon material is reduced, the electrochemical performance of the carbon material is improved, the resistance of modified biochar can be remarkably reduced, the conductivity of the biochar can be improved, and the electrochemical performance of porous carbon is improved.

The invention relates to an interface passivation layer, a perovskite solar cell, a preparation method of the perovskite solar cell and an electrical device. The perovskite solar cell comprises a transparent conductive layer, a hole transport layer, a perovskite absorption layer, an interface passivation layer, an electron transport layer and an electrode which are stacked. And the interface passivation layer comprises 3-fluoro-4-aminobenzoic acid. According to the invention, polyfunctional 3-fluoro-4-aminobenzoic acid is adopted as the interface passivation layer, so that the effect of fine passivation on the surface of the perovskite solar cell is realized, the 3-fluoro-4-aminobenzoic acid interface passivation layer can chemically react with atoms or molecules at the interface defects, the defects are filled, and the surface of the perovskite solar cell is protected. According to the invention, the energy loss caused by charge recombination and interface defects can be reduced, the morphology of the interface can be optimized, the roughness of the interface can be reduced, a smoother path is provided for electron transmission, the charge transfer resistance at the interface is reduced, and the overall photoelectric conversion efficiency of the cell is improved.

The invention relates to the field of fused salt energy storage, and provides a fused salt energy storage system based on an electrochemical sensing technology, comprising: a fused salt energy storage module for storing and converting energy through a liquid-solid two-phase heat storage medium and a modular heat storage device; the electrochemical sensing module is used for collecting electrochemical parameters of the fused salt in real time through a dual-electrode system sensor; the data processing module is used for analyzing the corrosion product layer structure of the metal material in the molten salt based on the electrochemical impedance spectroscopy and calculating the ion diffusion rate, and calculating the corrosion rate in real time by combining the charge transfer resistance; and the intelligent control module is used for dynamically adjusting the rotating speed of the fused salt circulating pump and the steam heat exchange power according to the corrosion rate and triggering local isolation protection. Intelligent management of fused salt energy storage can be achieved, the efficiency and safety of fused salt energy storage are remarkably improved, remarkable advantages are shown in the aspects of improving energy efficiency, guaranteeing safe operation and reducing maintenance cost, and an efficient and stable solution is provided for the fields of new energy consumption, industrial waste heat utilization and the like.

The invention provides a cobalt tungstate and bismuth vanadate photocatalytic material as well as a preparation method and application thereof, and belongs to the technical field of material synthesis and photocatalytic application. In the presence of monoclinic-phase decahedron BiVO4, CoWO4 nanoparticles grow in situ on an electron-rich (010) crystal face of the CoWO4 nanoparticles through a hydrothermal reaction, and the cobalt tungstate and bismuth vanadate photocatalytic material is obtained. According to the cobalt tungstate and bismuth vanadate photocatalytic material, a simple hydrothermal method is adopted, in the synthesis process, a CoWO4 precursor is guided by electrostatic interaction, preferentially adsorbed and subjected to nucleation growth on the (010) crystal face of BiVO4, a compact chemical bonding interface is constructed through selective growth, the charge migration distance is effectively shortened, and the photocatalytic performance of the material is improved. The interface charge transfer resistance is reduced to the greatest extent, and the formed binary photocatalyst has excellent effects on photocatalytic hydrogen evolution and tetracycline degradation.

The invention relates to an IrO2-Ta2O5 titanium anode coating based on graphene doping and temperature programming sintering synergistic enhancement and a preparation method of the IrO2-Ta2O5 titanium anode coating, and belongs to the technical field of electrode material preparation. According to the method, graphene is doped in an IrO2-Ta2O5 coating, the content of the graphene is controlled to be 0.2-0.8 mg / mL, preferably 0.6 mg / mL, the content of iridium is 26 g / m, and a 200-500 DEG C temperature programming sintering process is adopted. By optimizing the graphene dispersing and sintering process, the conductivity, the electrocatalytic activity and the structural stability of the coating are remarkably improved. Experimental results show that the coating has lower charge transfer resistance and higher electric double layer capacitance and oxygen evolution reaction activity, and the strengthening life of the coating exceeds 1100 hours and is far longer than that of a traditional titanium anode coating. The method is suitable for high-requirement electrochemical scenes such as electrolytic copper foil and chlor-alkali industry, and has a good industrial popularization prospect.

The invention belongs to the field of aluminum alloy processing, and provides a method for evaluating the corrosion resistance of an anodic oxide film and the corrosion capacity of a semi-synthetic cutting fluid, which comprises the following steps of: respectively taking a corrosive liquid or the semi-synthetic cutting fluid as an electrolyte and simulating a corrosive environment, and then taking an aluminum alloy sample as a working electrode to evaluate the corrosion resistance of the anodic oxide film and the corrosion capacity of the semi-synthetic cutting fluid; performing an electrochemical test in a corrosion environment to obtain charge transfer resistance Rct and corrosion current density Icorr, and then calculating a corrosion resistance index CI; the higher the obtained corrosion resistance index CI value is, the higher the corrosion resistance of the anodic oxide film of the aluminum alloy sample is, or the lower the corrosion capacity of the semi-synthetic cutting fluid is. And the corrosion resistance of the anodic oxide film or the corrosivity of the semi-synthetic cutting fluid can be rapidly and accurately evaluated.

The present invention discloses an indoor quantitative calibration device and method for the corrosion rate of steel bars under stress. The device comprises: a loading device and a testing device; the loading device comprises a loading frame, a first nut, a first disc spring, a second nut and a second disc spring; the testing device comprises a signal reader, a water tank and an inclined bracket, a water tank water inlet and a water tank drain arranged inside the water tank; the signal reader is used to connect a steel wire of the same material as the steel bar to be tested. The method comprises: S1, installing the device; S2, injecting a calcium hydroxide solution containing sodium chloride into the water tank through the water inlet; S3, accelerating the corrosion of the steel bar and steel wire to be tested; S4, calibrating the steel bar corrosion rate using the change in frequency before and after the steel wire is rusted. The method of the present invention fully considers the influencing factors such as the charge transfer resistance of the interface between the steel wire and the concrete, the concrete resistance and the film resistance of the steel wire passivation film to improve the test accuracy.

The invention discloses a method for evaluating and strengthening interface characteristics of a copper-based composite material, and relates to the technical field of copper-based composite materials. A soil solution and carbon quantum dots are prepared, and the carbon quantum dots are added into the soil solution; the method comprises the following steps: simulating a corrosion process of copper-based composite materials with different aluminum contents in soil solutions with different carbon quantum dot contents, and carrying out polarization curve and electrochemical impedance spectroscopy analysis on the corroded copper-based composite materials by adopting an electrochemical workstation to obtain charge transfer resistance and impedance modulus values of the copper alloy composite materials; meanwhile, SEM, EDS and three-dimensional surface contour analysis are combined, and the surface morphology and roughness of the copper-based composite material are obtained; according to the method, the electrochemical method and the corrosion surface characterization method are combined, the change of the surface and interface characteristics of the copper-based composite material corresponding to different matching materials can be rapidly evaluated, so that the purpose of protecting the alloy material is achieved, and aluminum and carbon quantum dots are found to be capable of synergistically promoting the protection of the copper-based composite material.

The invention discloses a three-dimensional conductive graphene and carbon nano conductive agent capable of reducing the internal resistance of a lithium battery, the conductive agent in the scheme limits the components and proportions of graphene, carbon nano tubes, carbon black and the like, and when the conductive agent is applied to an electrode, the components are matched to well fill, connect and coat gaps and remote particles of active material particles, so that the internal resistance of the lithium battery is reduced. The constructed and formed three-dimensional conductive structure can provide an electron transfer channel for lithium ions in the embedding / dragging embedding process, fast movement of electrons is facilitated, meanwhile, fast movement of the lithium ions in electrolyte is facilitated, local electroneutrality is not damaged, electron transport resistance and charge transfer resistance are reduced, and therefore the purpose of reducing the internal resistance of the battery is achieved.

The invention provides a nitrogen-vacancy carbon nitride / indium oxide heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysts. The nitrogen vacancy carbon nitride is used as a framework of the catalyst, and the charge distribution of the carbon nitride can be adjusted by nitrogen vacancy defects, so that the carrier migration rate and the surface active site abundance are improved; the nitrogen vacancy also changes the charge recombination mode of the carbon nitride, the energy band structure of the carbon nitride is beneficially adjusted, the photovoltaic performance of the carbon nitride is improved, the visible light response range of the carbon nitride is widened, and the photocatalytic performance of the carbon nitride is remarkably improved; indium oxide is introduced to form a heterojunction with nitrogen vacancy carbon nitride, so that electron-hole recombination can be inhibited, a new electron transmission channel is generated, and the carrier transmission rate is increased; the band gap characteristic of indium oxide is consistent with the band gap characteristic of nitrogen vacancy carbon nitride, so that the photocurrent response intensity of the catalyst can be improved, the charge transfer resistance is reduced, and the photocatalytic performance is synergistically enhanced.

The invention discloses a method for preparing a potassium-rich type potassium battery positive electrode material by using a chelating agent. The positive electrode material of the potassium-rich type potassium battery is a potassium-rich manganese-based Prussian blue analogue KxTmyMn1-yFe (CN) 6, 0lt, x is less than or equal to 2, 0lt; yt; Yt; 1, the material is prepared through a normal-temperature coprecipitation method; comprising the following steps: mixing concentrated hydrochloric acid, potassium chloride and CMC in deionized water to obtain a first solution, dividing the first solution into two parts, respectively adding potassium ferrocyanide and transition metal salt, mixing and stirring the two solutions, aging, centrifugally collecting, cleaning and drying to obtain the potassium-rich type potassium battery positive electrode material. According to the invention, CMC is used as a chelating agent and combined with the synergistic effect of doped transition metal elements, so that ion and electron transport is promoted together, and the problems of Mn < 2 + > dissolution and water-related side reactions are effectively alleviated, thereby reducing charge transfer resistance, enhancing electrochemical kinetics, and realizing high capacity and long cycle performance.