150 results about "Charge transfer resistance" patented technology

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 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.

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 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 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 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.

This invention relates to the field of water electrolysis and hydrogen energy utilization technology, and provides an in-situ electrodeposition method for improving NiMoP. x O y A method for studying the catalytic activity and stability of a self-supporting nickel-based hydrogen evolution electrode (NMOP). First, NiMoP... x O y The / NF self-supporting foam nickel-based electrode is prepared by immersing it in a nickel salt solution for a certain period of time, drying it, and then immersing it in a sodium sulfate solution for electrodeposition reduction reaction. This invention provides a simple and convenient method for adjusting the amount of metallic nickel deposited, ensuring its distribution among the active component particles of the electrode. This effectively improves the adhesion of the active component and prevents its detachment, significantly enhancing the hydrogen evolution activity and stability of the hydrogen evolution electrode. At an industrial current density of 100 mA / cm², the overpotential of the modified electrode prepared by this method is reduced by approximately 20% compared to the unmodified electrode, and the charge transfer resistance is reduced by approximately 41%. After 30,000 CV cycle accelerated durability tests, the increases in overpotential and charge transfer resistance are less than 7% and 26% of those of the unmodified electrode, respectively. Therefore, this invention has promising prospects for industrial application.

The application discloses a precision hardware fatigue damage detection method and system, and relates to the field of precision mechanical detection.The method comprises the following steps: coupling a flexible impedance sensing array with a precision hardware to be detected; the array substrate is made of polydimethylsiloxane, and the surface array groove is filled with a conductive hydrophilic composite gel formed by in-situ polymerization of acrylamide monomer, sodium alginate and nanometer carbon fibers, thereby forming a plurality of miniaturized impedance units; a constant pressure is applied through a pressure feedback control system, so that the gel produces elastic deformation to cover and compensate the micron-level roughness of the surface of the detection area; a micro-amplitude sinusoidal voltage excitation is applied, current response data in the swept frequency band is collected, complex impedance information is extracted and fitted to a randall equivalent circuit model, and charge transfer resistance and interface capacitance values are obtained; and the parameter deviation degree is calculated according to the charge transfer resistance of the current detection period and historical reference, so as to determine the fatigue damage condition of the local area.

The application discloses a kind of semi-cyclic polyacrylonitrile gel coated high-voltage positive electrode materials and preparation method and application thereof, the material includes high-voltage positive electrode material, and its surface is coated with semi-cyclic polyacrylonitrile gel layer.Preparation method includes polyacrylonitrile, lithium salt and ion liquid are dispersed in solvent, high-voltage positive electrode material is added, stirring, sintering, to obtain above-mentioned material.Semi-cyclic polyacrylonitrile gel coated high-voltage positive electrode material in the application, with semi-cyclic polyacrylonitrile gel layer as coating layer, can optimize contact impedance and charge transfer resistance, while it can improve the kinetics transmission in composite positive electrode and can realize in-situ construction stable internal interface layer in electrochemical process, inhibit the occurrence of side reaction and improve the stability of positive electrode structure and the cycle stability of battery, so it can be widely used to construct solid-state battery, and its preparation method also has the advantages of simple process, process controllable, continuous production etc., suitable for large-scale preparation, convenient for industrial application.

The application discloses a kind of lithium battery's residual life prediction method, belong to battery life prediction technical field.The application first divides lithium battery charging process into constant-current section, transition section and constant-voltage section, collects voltage and current signal in each section, obtains equivalent transient impedance spectrum by Fourier transform, and calculates interface aging factor based on charge transfer resistance, ohmic resistance and double-layer capacitance;Then respectively extract the features in each section to form the feature vector in each section, derive to obtain the feature vector between sections, splice the three feature vectors in each section corresponding to similar data and two feature vectors between sections to form feature splicing vector;Finally, using the feature weighted distribution type BP model, the feature splicing vector of equivalent transient impedance spectrum and interface aging factor is processed, and the residual life prediction value is output.The application improves the prediction accuracy significantly by charging segmented feature extraction, inter-feature extraction and weighted model optimization.

The invention relates to the technical field of supercapacitor preparation, in particular to a (NiCo) Se2 / CoFe2Se4 composite electrode, a preparation method and application, and the method comprises the steps: preparing a NiCo precursor solution through Ni salt, Co salt and urea, growing NiCo precursor nanorods on a titanium mesh, and constructing a three-dimensional conductive skeleton; then preparing a Co-FePBA suspension by using Co salt, sodium citrate and K3 [Fe (CN) 6]; the titanium mesh loaded with the NiCo precursor nanorod is soaked in Co-FePBA suspension and aged at the constant temperature, a double-active-component precursor is formed, effective interface chemical bonding is formed, and the charge transfer efficiency can be effectively improved; finally, a (NiCo) Se2 / CoFe2Se4 heterojunction is generated through gas-phase selenylation, charges are redistributed at a heterogeneous interface, a built-in electric field is formed, and electron transfer and ion adsorption are accelerated; according to the method, the reaction kinetics of collaborative optimization of the (NiCo) Se2 and the CoFe2Se4 is realized, the process is simple, convenient, environment-friendly and economical, a feasible scheme is provided for large-scale production, and the problems of compounding of the (NiCo) Se2 and the CoFe2Se4, high charge transfer resistance and poor charge and discharge efficiency in the prior art are solved.

A negative electrode is provided. The negative electrode comprises a negative current collector and a negative active material layer arranged on the negative current collector. The anode active material layer includes an electrochemically active material, a dispersant polymer binder, an adhesive polymer binder, and a conductive filler. The electrochemically active material includes graphite. The dispersant polymer binder has amphiphilic properties, including a hydrophobic domain and a hydrophilic domain that stabilizes hydrophobic carbon in water. The adhesive polymer binder has a glass transition temperature and can provide flexibility, durability, and cohesive strength between carbon particles. The conductive filler includes a conductive carbon that reduces pore channels and charge transfer resistance at the binder active material interface.

The invention belongs to the technical field of electrolyzed water, and particularly relates to an electrolyte additive for improving the reaction performance of electrolyzed water, an electrolyte, an electrolyte solution and a method for improving the reaction performance of electrolyzed water. The additive comprises nonmetal oxosalts (sulfate, phosphate, borate, selenate, silicate, carbonate, perchlorate, trifluoroacetate and the like) and an aqueous solution of the nonmetal oxosalts, and is used as an electrolyte additive for water electrolysis reaction with KOH or NaOH as an electrolyte. The invention provides application of oxysalt to improvement of oxygen evolution activity and stability of electrolyzed water. In particular, the device is also suitable for electrolytic reactions carried out at high and low temperatures. Due to the addition of the oxysalt, the oxygen evolution reaction potential is reduced, the charge transfer resistance is reduced, the electron transmission rate is increased, and relatively high chemical reaction kinetics is achieved, so that the reaction activity is favorably improved.

A sodium-ion solid-state electrolyte and a preparation method therefor, and an all-solid-state sodium-ion battery. The electrolyte comprises a substrate and an interface protection layer, wherein the interface protection layer covers a surface of the substrate; the substrate is a polymer electrolyte; the interface protection layer is a metal; and the metal comprises at least one of Sn, Zn, In, Sb, Bi and Ge. By covering the surface of the substrate with the metal source serving as the interface protection layer, a stable metal thin layer interface is formed by means of the alloying of sodium and the metal source, which metal thin layer interface can effectively prevent the growth of sodium dendrites, reduce damage to the sodium-ion solid-state electrolyte in the cycling process of a battery, improve the interfacial wettability and reduce the interfacial charge transfer resistance, thereby improving the interface stability of a sodium metal negative electrode and the solid-state electrolyte, and therefore a stable long-cycle all-solid-state sodium-ion battery is obtained.

The invention relates to the technical field of preparation of a lithium ion battery negative electrode material, in particular to double-metal synergistic doping for improving the performance of an iron oxide negative electrode lithium ion battery and a preparation method of the double-metal synergistic doping. According to the double-metal synergistic doping, metal is doped into iron oxide mainly through a wet ball milling method. According to the invention, bimetal with a synergistic effect is innovatively doped into the iron oxide, and the conductivity of the iron oxide is effectively improved and the charge transfer resistance is reduced by virtue of the conductivity of the doped metal and enhancement of the structural stability of the iron oxide; the volume expansion and shrinkage of the iron oxide in the charging and discharging process are buffered. The high-rate discharge performance and the specific discharge capacity of the iron oxide negative electrode are improved by doping different bimetals and regulating and controlling the ratio of the doped metals to the iron oxide.

The invention discloses a preparation method of a three-dimensional MXene / carbon quantum dot hybrid material for a negative electrode of a high-performance lithium ion battery, which comprises the following steps: by taking cationic polylactic acid (CPLA) microspheres as a self-sacrifice template, uniformly coating the surface of CPLA with negatively charged MXene nanosheets through electrostatic self-assembly in deionized water to form a composite microsphere precursor; then vacuum freeze drying and high-temperature heat treatment are carried out, CPLA is decomposed, carbon quantum dots are induced to be generated in situ, the hybrid material composed of the three-dimensional MXene hollow microspheres and the carbon quantum dots is obtained, and the carbon quantum dots are of a highly-graphitized ordered structure and are stably attached to the surfaces and the interlayers of the hollow microspheres. When the material is used as a negative electrode of a lithium battery, the unique three-dimensional porous structure and surface characteristics of the material form a synergistic effect, so that the specific surface area is effectively increased, the charge transfer resistance is reduced, the stability of an ion transmission channel and an electrode structure is optimized, and the reversible capacity and cycle performance of the battery are remarkably improved.

This invention provides an online detection method for effective chlorine concentration using a thin-layer channel electrochemical sensor. The method includes: measuring the charge transfer resistance of the sensor's working electrode using electrochemical impedance spectroscopy; intelligently determining the electrode's contamination state and triggering closed-loop adaptive cleaning; after cleaning, measuring the high-frequency impedance of the solution to obtain real-time conductivity parameters; applying a detection sequence containing at least three different potential steps, simultaneously acquiring the steady-state current, pH value, and temperature of the solution at each potential; correcting the current for conductivity based on the solution impedance; and calculating the molecular hypochlorous acid concentration in real time based on the dissociation equilibrium formula of hypochlorous acid, combined with pH value and temperature. This invention achieves intelligent maintenance of the electrode state and dynamic compensation for solution matrix interference, enabling high-precision and high-stability online detection of the molecular hypochlorous acid concentration, which plays a crucial role in disinfection efficacy.

The application discloses a kind of Pt nanoparticle load Fe-based MOF photocatalyst and its preparation method and application, belong to environmental energy technical field.The preparation method disclosed in the application uses 2-amino terephthalic acid, FeCl3·6H2O and aqueous solution of chloroplatinic acid hexahydrate as raw material, through hydrothermal reaction, Pt nanoparticle is dispersed in situ and loaded NH2-MIL-101 (Fe), reduces interface charge transfer resistance, inhibits the recombination of photo-generated carriers, to further improve the photocatalytic nitrogen fixation activity, using the synergistic effect of NH2-MIL-101 (Fe) composite photocatalyst containing Pt nanoparticle to achieve the purpose of improving the yield of photocatalytic conversion of nitrogen to ammonia, significantly solve the high energy consumption and environmental pollution problem of traditional industrial nitrogen fixation Haber-Bosch method.

The present invention discloses a method and device for optimizing the design and manufacturing of an alloy structure. The method includes: by means of numerical simulation methods, regulating the alloy microstructure, surface free energy parameters, as well as the corrosion environment and stress boundary conditions, calculating the corrosion potential, corrosion current density and charge transfer resistance of the alloy under different conditions; establishing a quantitative relationship between the alloy microstructure, surface free energy and corrosion resistance; according to the target microstructure parameters, constructing an alloy with the target microstructure by 3D printing; using pretreatment conditions and fluoroalkylsilane modification conditions to prepare a superhydrophobic alloy; analyzing the influence rules of 3D printing conditions, pretreatment conditions and fluoroalkylsilane modification conditions on the alloy microstructure, surface free energy and hydrophobicity; optimizing the alloy preparation conditions according to the influence rules. Combining theoretical simulation and experiments, clarify the internal relationship between the construction method of the corrosion-resistant alloy - microstructure, surface free energy - hydrophobicity - corrosion resistance, and improve the corrosion resistance of the alloy structure.

The invention relates to the technical field of energy storage material preparation, in particular to a bionic compound eye structure photo-anode and a preparation method and application thereof. The photoanode electrode of the CdS / ZnO / FTO compound eye structure heterogeneous thin film is used as the anode of the photoelectrochemical PEC water decomposition hydrogen production battery, and CdS with the narrow band gap of 2.4 eV is introduced and can be coupled with ZnO to expand visible light absorption, so that the photoelectrochemical PEC water decomposition hydrogen production battery is used for photoelectrochemical water decomposition. This makes it a suitable choice for PEC applications. Besides, a ZnO / CdS heterojunction is formed through coupling of CdS and ZnO, a staggered band gap structure is caused, semicircles of all ZnO / CdS heterostructure films are smaller than exposed ZnO, charge transfer resistance is reduced through formation of the heterostructure, transfer of photo-induced electron holes from CdS to ZnO is effectively accelerated, recombination at an interface is also remarkably inhibited, and therefore PEC efficiency is improved.