403 results about "High current density" patented technology

The invention relates to a proton exchange membrane fuel cell (PEMFC) high current density performance prediction method, system, equipment and medium. The method comprises the following steps: establishing a multi-physical field coupling model which comprehensively considers complex processes such as electrochemical reaction, proton conduction, gas diffusion and heat transfer, and describing the change of each physical quantity by adopting a partial differential equation based on a basic physical law; performing grid division and numerical discretization on the proton exchange membrane fuel cell model; selecting model parameters, and verifying the model through experimental data of different working conditions; inputting actual working condition parameters into a model to predict performance, and analyzing a simulation result; using a convolutional neural network, a recurrent neural network and an auto-encoder to extract features from different types of data and fuse the features to form a comprehensive feature vector; a deep neural network prediction model is constructed, and a cross entropy loss function and an Adam optimizer are adopted for training; dropout, L1 and L2 regularization, k-fold cross validation and transfer learning are utilized to optimize the model, and the generalization ability is improved; the system, the equipment and the medium realize high current density performance prediction of the proton exchange membrane fuel cell (PEMFC) based on the method; the prediction precision is improved, the experiment cost is reduced, the internal mechanism can be deeply understood, and powerful support is provided for design optimization, operation management and fault diagnosis of the fuel cell.

The invention relates to the field of durability testing of anion-exchange membrane electrolytic cells, in particular to a durability testing method of an anion-exchange membrane electrolytic cell. The durability testing method for the anion exchange membrane electrolytic cell comprises the following testing steps: S1, assembling the electrolytic cell; s2, activation and initial testing; s3, accelerated durability test: (a) running for 100 hours under the rated current density; (b) running for 100 hours at high current density; (c) periodically and alternately operating for 100 hours at the rated current density and the high current density; and S4, evaluating after testing. According to the application, load fluctuation in practical application is simulated through dynamic working conditions, and a degradation process similar to long-term steady-state operation can be induced within 300 hours in combination with a high-current-density acceleration condition. According to the method, the period of several months or even one year required by a traditional steady state test is shortened to several weeks through scientific design of a test process, and meanwhile, the consistency of a test result and an actual working condition is ensured.

The invention relates to a formation method of a lithium-free negative electrode battery, and belongs to the technical field of lithium batteries. The testing method comprises the following steps: standing at low temperature before first-circle charging to enable the interior of the battery to reach a steady state, carrying out short-time and low-electric-quantity charging by adopting large current, and charging and discharging for several circles by adopting small current after the interior of the battery reaches the steady state at room temperature. According to the formation process provided by the invention, a compact seed crystal layer formed by lithium cores can be formed on the surface of Cu in situ at low temperature and high current density, so that the physical binding force between a deposited lithium layer and a copper substrate is remarkably enhanced, and the contact resistance is reduced, thereby inhibiting the growth of moss or dendritic metal lithium and realizing low-porosity and high-compactness lithium deposition; and a more uniform and stable SEI film is formed through low-current deposition, so that the coulombic efficiency and the cycling stability of the battery are improved.

The invention discloses a GaN-based blue-green light LED epitaxial structure and a preparation method thereof. The GaN-based blue-green light LED epitaxial structure comprises a substrate, and a buffer layer, a 3D layer, a U-GaN layer, an N-GaN layer, a multi-quantum well layer, an electron blocking layer and a P-GaN layer which are stacked on the substrate in sequence, the multi-quantum well layer comprises a shallow well transition layer, a high-temperature quantum well layer, a stress release layer and a low-temperature quantum well layer which are sequentially stacked, and the stress release layer comprises AlN layers and GaN layers which are periodically and alternately stacked. By implementing the invention, the luminous efficiency of the light-emitting diode under high current density can be effectively improved.

The invention discloses an artificial SEI material and a preparation method thereof, an artificial SEI film and an artificial SEI film modified negative electrode. The artificial SEI material is an organic polymer brush (CNF-g-PSSX) prepared by grafting cellulose nanofibers with polystyrene sulfonate. The polymer brush is of a crystal structure and has a firm framework; and the side chain of polystyrene sulfonate has rich-SO3 functional groups which are matched with cations in sulfonate, so that a rapid ion transmission channel is provided, high-current-density circulation can be realized, and good interface contact is ensured. Due to a special molecular topological structure and a multi-component synergistic effect, when the organic polymer brush forms an artificial SEI film, high mechanical strength, high ionic conductivity and low interface impedance can be obtained at the same time, and through strong electrostatic repulsion between a negatively charged-SO3 group and the surface of a negatively charged lithium dendrite tip, the electrochemical performance of the artificial SEI film is improved. An obvious inhibition effect is shown on the continuous growth of dendritic crystals.

The invention provides an electrolyte for quickly charging a sodium-ion battery without a negative electrode. The electrolyte comprises a sodium salt, a solvent and an additive. According to the electrolyte, metal oxide nanoparticles are introduced as a first additive, and a second additive is supplemented, so that rapid desolvation of sodium ions on an electrode interface and improvement of the ionic conductivity of an electrolyte body are realized at the same time, and compact and dendrite-free sodium deposition under high current density is realized. The negative-electrode-free sodium-ion battery prepared from the electrolyte can be quickly charged, and good cycling stability and high capacity retention ratio can be maintained, so that the use requirements of people can be met.

The invention discloses a method for constructing a foamed nickel hydrogen evolution electrode with a multi-layer gradient structure based on two-step electrodeposition. According to the method, the in-situ growth of a multilayer gradient structure catalyst layer is realized by regulating and controlling the current density, and the core process comprises the following steps: 1, pretreatment of an electrode substrate: carrying out ultrasonic cleaning on foamed nickel through hydrochloric acid, absolute ethyl alcohol and deionized water in sequence, and removing surface impurities; 2, step-by-step electro-deposition of the gradient catalyst layer: firstly, electro-deposition is carried out under low current density to form a uniform and compact transition catalyst layer, the contact area between the catalyst layer and the base material is increased, and the durability and stability of the catalyst layer are improved; and then switching to high current density for bubble template method electrodeposition, spontaneously forming a catalyst layer with an inverted cone-shaped hole array structure by utilizing the dynamic template effect of violent hydrogen evolution bubbles, and promoting rapid removal of the bubbles by utilizing the hole array. The electrode prepared by the method has excellent stability, bubble removal capability and catalytic activity in hydrogen evolution reaction.

The invention provides an MOSFET and a manufacturing method thereof. The MOSFET includes a substrate; the epitaxial layer is arranged on the substrate; the trench gate group comprises a first trench gate and a plurality of second trench gates, the first trench gate extends into the epitaxial layer from the surface of the side, away from the substrate, of the epitaxial layer, the first trench gate extends in the first direction on the plane where the epitaxial layer is located, and the second trench gates are arranged at intervals in the first direction; the orthographic projection of the second trench gate on the substrate is located in the orthographic projection range of the first trench gate on the substrate, the top of the second trench gate is in contact with the bottom of the first trench gate, and a gate layer in the second trench gate is connected with a gate layer in the first trench gate; each shielding region wraps the bottom and all the side walls of the second trench gate and extends towards the surface of the side, away from the substrate, of the epitaxial layer so as to cover the side wall of the first trench gate, and the multiple shielding regions are arranged at intervals. The shielding region has a three-dimensional structure, so that the stress of a trench gate oxide electric field can be reduced, the cell size of the MOSFET can be reduced, and the current density of the MOSFET can be improved.

A planar filament for an x-ray tube can have a different cross-sectional area at different locations. In regions of smaller cross-sectional area, there can be higher current density, and thus increased heating and higher temperature of the wire. In regions of larger cross-sectional area, there can be lower current density, and thus decreased heating of the wire. Regions of larger cross-sectional area can also be stronger, thus reducing early filament failures. Wider regions can have increased area for electron emission. By adjusting the cross-sectional area and width of the wire at different locations, electron emission can be largely confined to a center of the filament, and filament life can increase.

The invention provides a surface treatment agent, a surface treatment method of a copper foil and a copper foil negative electrode current collector, and belongs to the technical field of energy materials. The copper salt is used as a copper source, the N-alkyl pyridine halogen salt ionic liquid is used as a halogen source, the copper salt and the N-alkyl pyridine halogen salt ionic liquid react in the solution to form cuprous halide particles on the surface of the copper foil in situ, the specific surface area and the roughness of the surface of the copper foil negative electrode current collector are increased, the copper foil negative electrode current collector is firmly combined with an active substance, and therefore the specific capacity and the rate of the lithium ion battery are improved; cu < + > in the cuprous halide particles formed on the surface of the copper foil also participates in electrochemical reaction, so that the specific capacity of the lithium ion battery is further improved. The result of the embodiment shows that the capacity of the lithium ion battery prepared from the copper foil negative current collector obtained by carrying out surface treatment on the copper foil by the surface treating agent provided by the invention can reach 825mAh g <-1 >; 100 times of charge-discharge cycles are carried out under the large current density of 1Ag <-1 >, and the retention rate can reach 95%.

A planar filament for an x-ray tube can have a different cross-sectional area at different locations. In regions of smaller cross-sectional area, there can be higher current density, and thus increased heating and higher temperature of the wire. In regions of larger cross-sectional area, there can be lower current density, and thus decreased heating of the wire. Regions of larger cross-sectional area can also be stronger, thus reducing early filament failures. Wider regions can have increased area for electron emission. By adjusting the cross-sectional area and width of the wire at different locations, electron emission can be largely confined to a center of the filament, and filament life can increase.

The invention belongs to the field of batteries, and provides a high-current-density long-circulation zinc-bromine flow battery negative electrode electrolyte and battery preparation. The battery comprises a positive electrode, a negative electrode, a diaphragm, positive and negative electrolyte, a current collector and an end plate, the diaphragm is a cation exchange membrane; and the negative electrode electrolyte comprises a metal salt, a supporting electrolyte, an organic carboxylate complexing agent and deionized water. The organic carboxylate complexing agent disclosed by the invention can be adsorbed on a porous electrode, and by increasing zinc deposition sites, inhibiting two-dimensional interface diffusion and promoting zinc mass transfer, zinc dendrites are relieved, and the zinc-bromine flow battery with high current density and long circulation stability is realized.

The present disclosure relates to an air electrode for a metal-air battery including a cobalt-manganese heterostructure, a metal-air battery including the same, and a method of preparing the cobalt-manganese heterostructure. A cobalt-manganese heterostructure according to embodiments of the present disclosure exhibits excellent oxygen reduction reaction (ORR) activity and durability as well as superior oxygen evolution reaction (OER) performances including a high current density to RuO2 OER catalysts.

The invention provides an activation method of a proton exchange membrane fuel cell. The activation method comprises the following steps of nitrogen purging, air soaking, high and low potential rapid circulation and cathode starvation. Gas in the cathode and anode pipelines and the cavity is exhausted through nitrogen, and irreversible attenuation of a catalyst caused by a hydrogen-air interface of the anode is prevented; toxic gas on the surface of the anode catalyst is removed through air soaking; through variable current loading, potential rapid circulation is realized, external high humidification is combined, a large amount of water is generated by an electric pile at a low potential to rapidly humidify a proton exchange membrane, the proton transfer resistance is reduced, and impurities on the surface of a cathode catalyst can be removed at a high potential; oxides on the catalytic surface of the cathode are reduced through cathode starvation under high current density, so that the performance of the stack is improved, an efficient and stable three-phase interface transmission channel is formed, and the activation of the fuel cell stack is realized.

The invention provides an X-ray absorption spectrum characterization system and an X-ray absorption spectrum characterization method for electrochemical reaction under a high-current working condition. A high-current electrochemical workstation provides current density not lower than that of a working condition electrolytic tank; the working condition electrolytic tank comprises a working electrode chamber and a counter electrode chamber which are oppositely arranged, and an ion exchange membrane arranged between the working electrode chamber and the counter electrode chamber; the working electrode chamber comprises a current-conducting plate made of a metal sheet, a working electrode loaded with a catalyst is arranged on one side, facing the ion exchange membrane, of the current-conducting plate, and a hollow flow channel is formed in the central area of the working electrode chamber; the working electrode chamber further comprises an X-ray window sheet for transmission of incident X-rays and fluorescent X-rays generated by the catalyst; the counter electrode chamber is provided with an electrolyte flow channel, and a counter electrode is arranged on one side, facing the ion exchange membrane, of the counter electrode chamber; and the electrolyte control system is used for realizing circulating flow of the electrolyte. Under the working conditions of high current density, strong bubble effect and high X-ray absorption, in-situ, real-time and high signal-to-noise ratio characterization of the microstructure of the catalyst can be realized.

The invention discloses an electrolytic tank performance analysis method based on polarization feature recognition. The method comprises the steps that S1, electrolytic tank parameters are set, electrochemical testing is conducted, and EIS impedance data are obtained; s2, preprocessing the EIS impedance data: performing Kramers-Kronig verification on the EIS impedance data, calculating a relative residual error of the data, and selecting a regularization parameter lambda; s3, applying the EIS impedance data to DRT quantitative analysis: converting the EIS impedance data into a DRT spectrogram based on discretization of a radial basis function and a Tikhonov regularization method; and S4, performing DRT spectrogram identification by using a DRT method, establishing an ECM model, and evaluating the influence of metal cation pollution on PEMWE performance degradation by using the ECM model. According to the electrolytic cell performance analysis method based on polarization feature recognition, the core problem that all polarization processes and the evolution rule of the polarization processes in performance degradation are difficult to accurately analyze under the condition of high current density in the prior art is solved.

The invention discloses a carbon-lithium composite material, a preparation method and a lithium ion battery, the carbon-lithium composite material comprises a sulfur and selenium co-doped anthracite-based carbon material and lithium metal, the mass fraction of carbon in the composite material is 43.4%-97.13%, the mass fraction of sulfur is 0.65%-7.723%, the mass fraction of selenium is 0.3%-5.35%, and the mass fraction of lithium is 0.99%-50%. The interior of a bulk phase of the anthracite-based carbon material has a rich pore structure, lithium metal can be effectively contained, growth of lithium dendrites and generation of dead lithium can be inhibited, the disordering degree and porosity of the carbon material can be further improved through sulfur-selenium co-doping, uniform deposition of lithium ions is facilitated, local high current density is avoided, and the performance of the carbon material is improved. The growth of lithium dendrites is inhibited. In addition, sulfur and selenium co-doping can maintain the electronic conductivity while improving the lithium storage performance of the carbon material.

The invention discloses a ternary positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: modifying a ternary matrix material in a composite doping manner of rare earth elements and transition metals, and then coating the surface of the material with a layer of amorphous ferric fluoride in a manner of combining atomic layer deposition with fluorination reaction. The ternary positive electrode material provided by the invention has higher rate capability and better cycling stability, and can maintain better chemical performance under high current density, so that the problems of capacity loss and poor electrical performance of the ternary positive electrode material of the lithium battery in a high-voltage long-cycle process are greatly relieved.

The invention discloses a bimetallic sulfide and biomass carbon composite material for a sodium ion battery, a negative electrode and a negative electrode of the sodium ion battery. In the bimetallic sulfide and biomass carbon composite material for the sodium ion battery provided by the invention, due to the existence of a heterostructure, the transmission rate of sodium ions in the charging and discharging process is accelerated; and due to the existence of a unique porous carbon skeleton derived from diatomite, the structural stability of the Ni3S2atCo9S8-BC anode in the charge-discharge process is ensured. Besides, the metal sulfide particles are limited to the nanometer level, under the synergistic effect of the carbon skeleton, the aggregation phenomenon of the metal sulfide particles in the circulation process can be effectively inhibited, the reversible capacity of 225.36 mAh g <-1 > can still be provided even under the large current density of 10 A g <-1 > after 7000 times of circulation, the capacity retention rate is 65.3%, and the capacity fading rate of each circle is 0.00138%.

The invention relates to a preparation method of an electrode, the electrode and a metal-based flow battery. The preparation method of the electrode comprises the following steps: S100, cleaning and drying a carbon felt; s200, preparing an MXene colloidal solution; and S300, loading the MXene colloid on the surface of the carbon felt in situ by adopting an electrochemical deposition method to form the MXene-coated CF composite electrode. Through the arrangement, the high-zinc-ion-concentration IHP layer is constructed on the negative electrode of the battery by using MXene to inhibit dendritic crystal formation and reduce polarization loss, and the high-current-density performance and cycling stability of the zinc-bromine flow battery are improved.

According to the aqueous electrolyte, the preparation method and the aqueous metal ion battery provided by the invention, the zinc salt, the deionized water and the additive are mixed to obtain the electrolyte, and the additive comprises the carbamido-containing organic molecules, so that a double-electric-layer structure on the surface of zinc metal can be changed, an energy barrier in a stripping process can be reduced, and a zinc metal negative electrode can be regulated and controlled to be stripped uniformly; the battery is promoted to show stable cycle performance under high current and high capacity; meanwhile, the electrolyte containing the carbamido organic molecule additive optimizes the surface state of the zinc metal negative electrode and ensures the advantages of high ionic conductivity, low cost and environmental protection of the pure water system electrolyte; besides, the aqueous electrolyte provided by the invention can be applied to the rechargeable aqueous zinc ion battery, realizes long cycle life under high current density and deposition capacity, and has wide application prospects.

The invention discloses a rare earth metal electrolytic reduction method based on a high-frequency switching power supply, and relates to the technical field of rare earth metal electrolytic reduction, and the method comprises the following steps: firstly, in a praseodymium-neodymium electro-deposition process, parameter data in the praseodymium-neodymium electro-deposition process is accurately obtained in real time by using an advanced sensor and detection equipment; and accurate, comprehensive and real-time data support is provided for subsequent intelligent analysis. According to the invention, the problems of stress accumulation, crack propagation and coating stripping caused by fixed preset intermittent closing time in high-current density electrodeposition are solved. Intelligent optimization is realized through real-time data acquisition, deep learning evaluation and dynamic pulse current regulation and control. And when the stress rise is detected, the system adaptively prolongs the intermittent closing time, and reduces the pulse peak current, so that the deposition rate is optimized, and the uniformity and compactness of a plating layer are improved. The method improves the mechanical strength and corrosion resistance of the coating, prolongs the service life of equipment, reduces the energy consumption, and improves the process stability and consistency.

The invention discloses a nickel-based electrode material for stable electrolytic hydrogen production under a real seawater system and a preparation method thereof. The preparation method comprises the following steps: immersing foamed nickel in a transition metal salt solution for ion exchange; and carrying out low-temperature sintering on the ion-exchanged foamed nickel to obtain the Ni-based electrode material. The electrode material has high-efficiency seawater electrolysis oxygen evolution and hydrogen evolution activity, and the current situation that the electrolysis stability is poor due to self-dissolution of a Ni-based electrode material in alkaline electrolyte is improved. In an oxygen evolution reaction and a hydrogen evolution reaction, the overpotentials under 100mA / cm < 2 > are respectively 314mV and 338mV. The composite material is used as an anode electrode material and a cathode electrode material at the same time to be assembled into an all-electrolytic tank to fully decompose seawater, and current of 100 mA / cm < 2 > is generated under the voltage of 1.90 V. The assembled full-electrolytic seawater electrolytic cell can stably electrolyze real seawater for 700h under the high current density of 500mA / cm < 2 >, and the potential is not obviously attenuated.

The invention relates to an activated carbon electrode material for a supercapacitor and a preparation process thereof, and belongs to the technical field of activated carbon electrode materials. The preparation process provided by the invention specifically comprises the following steps: mixing cane sugar, ammonium dihydrogen phosphate, deionized water and zinc gluconate, carrying out spray drying at 80 DEG C to obtain precursor powder with a loose structure, carbonizing, then carrying out pulse activation, water vapor reaming, cooling and post-treatment, mixing the obtained composite material with carbon nanofibers, a PTFE binder and absolute ethyl alcohol, and carrying out ball milling, so as to obtain the carbon nanofiber composite material. And coating the obtained slurry with an aluminum foil, drying, rolling, and carrying out hot press molding, thereby obtaining the product. According to the invention, cane sugar is used as a carbon source, zinc gluconate is introduced to assist in forming a honeycomb-shaped pore frame, and a honeycomb-shaped porous structure is formed along with further increase of carbonization temperature and multiple cyclic pulse activation and water vapor chambering processes, so that the ion transmission efficiency is improved, and the loss of a specific capacitance value under high current density is reduced; the capacitance performance of the material is improved.

The invention belongs to the technical field of flat wire motors, and provides a winding structure based on a flat wire conductor, which comprises a stator core and a three-phase coil, a plurality of stator grooves are formed in the inner surface of the stator core, three-phase coils are installed in the stator grooves, the three-phase coils are divided into n layers from the groove bottoms of the stator grooves to groove openings, and n is larger than 1. The three-phase leading-out ends of the other three-phase coils are located on the ith layer, n > = i > = 1, and the neutral ends are located on any adjacent layer of the three-phase leading-out ends; the three-phase leading-out end is connected with a leading-out assembly, and the neutral end is connected with a neutral bar. The three-phase leading-out ends and the neutral ends are adjacently arranged in a staggered mode, current flowing-in and flowing-out paths are spatially separated, meanwhile, the neutral ends and the three-phase leading-out ends of adjacent layers form natural shielding layers, electromagnetic radiation generated by high-frequency harmonic waves is reduced, the three-phase leading-out ends are intensively arranged in the middle layer, excessive concentration of a high-current-density area is avoided, and the electromagnetic radiation is reduced. And the local temperature rise condition is reduced.

The invention discloses a high-efficiency and high-leveling-capacity electronickelling solution, and relates to the technical field of electroplating. The high-efficiency and high-leveling-capacity electronickelling solution comprises the following components in parts by mass: 60-90 parts of nickel salt; 60-120 parts of a composite brightener; 40-80 parts of a stabilizer; 50 to 100 parts of an anti-pinhole agent; 40-80 parts of a dispersant; and 50-150 parts of a composite leveling agent. The composite brightener provided by the invention improves the tolerance of high current density, and especially has more prominent advantages on the compactness and binding force of a thick nickel coating; the anti-pinhole agent can reduce the porosity of the plating layer possibly caused by gas precipitation in the electroplating process, and less nickel nodule is generated, so that the toughness of the plating layer is enhanced; according to the nickel electroplating solution with the composite leveling agent matched with the composite brightening agent, the roughness Ra value of a base material with the roughness Ra value being 2.0 microns or above can be reduced to 0.4 microns or below, a dendritic crystal structure cannot occur when the leveling agent and the brightening agent are used in cooperation, and the problem of brittleness of a plating layer is avoided.

The present invention relates to the technical field of cables, and proposes a low-voltage power cable, which includes a plurality of conductive cables. Each conductive cable includes a plurality of stranded conductors, and an insulating layer is coated outside each of the plurality of stranded conductors; the plurality of stranded conductors are all arranged inside a lining layer, a filling layer is arranged between the lining layer and the plurality of insulating layers, and a sheath layer is coated outside the lining layer. The low-voltage power cable further includes a docking cylinder, a wire laying assembly, a conductive frame, a conductive assembly, and a heat dissipation assembly. A docking cylinder is slidably sleeved at the end of each sheath layer, the wire laying assembly is installed on the docking cylinder, a conductive frame is arranged between every two docking cylinders with opposite positions, a conductive assembly is installed on each conductive frame, and a heat dissipation assembly is installed on each conductive assembly. Through the above technical solution, the problem in the prior art is solved that at the position where two cables are docked, a relatively high current density is likely to occur, causing the local temperature at the contact point to rise, resulting in a gap between the two cables and affecting the current transmission performance.

The invention discloses an insulated gate bipolar transistor device and a preparation process thereof, and the device comprises a substrate, a drain electrode which is formed below the substrate, a dielectric layer which is formed above the substrate, a source electrode which is formed above the dielectric layer, and a plurality of grooves which are formed in the substrate in a downward etching and sinking manner and are independently arranged, independent trench gates are deposited in the trenches, the cross section of the plurality of trenches is of a circular or annular or polygonal closed structure, and the trench gates are insulated and isolated from the side walls of the trenches and the source electrodes through dielectric layers. The novel groove type IGBT structure is achieved through the groove gates arranged in a circular layout mode, the structure has the advantages of being high in channel density, large in current density, simple in process and the like, and the chip area and the cost can be reduced while the current capacity is kept; or the current density and the power density of the device are improved while the chip area is maintained, and the on-state loss is reduced.

The invention relates to the technical field of copper material processing and manufacturing, in particular to a graphene copper composite material for transmission under high current density and a preparation method thereof.The method comprises the steps that cold isostatic pressing treatment is conducted on copper powder for in-situ growth of graphene, and a compressed blank is obtained; sintering the compressed blank to obtain a sintered blank; carrying out extrusion treatment on the sintered blank to obtain an extruded blank; the extrusion blank is subjected to a drawing process and annealing treatment, and the graphene copper composite material is obtained; the temperature rise of the obtained graphene copper composite material is at least 10% lower than that of oxygen-free copper under the large current density, the high-temperature conductivity is 3%-7% higher than that of TU0 oxygen-free copper, the temperature coefficient of resistance (TCR) is at least 3%-11% lower than that of pure copper, the heat conductivity coefficient reaches at least 440 W / (m.K), the conductivity is at least 105% IACS, the tensile strength is larger than or equal to 350 MPa, and the softening temperature is larger than or equal to 300 DEG C.

The invention provides a phosphorus-doped CoFe-LDH electrode for high-current hydrogen production as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing foamed nickel subjected to acid pickling treatment with a red phosphorus solution, and carrying out hydrothermal reaction to obtain NiP; the preparation method comprises the following steps: immersing NiP into a mixed solution of cobalt acetate tetrahydrate and 2-methylimidazole to obtain Co-ZIF-L-coated NiP; and the Co-ZIF-L (at) NiP is immersed in a ferrous sulfate tetrahydrate solution, and the CoFe-LDH (at) NiP-120 electrode is obtained through heating. An anion exchange membrane water electrolysis device (AEM) based on the electrode shows remarkable activity when the voltage is 1.85 V, the current density reaches 100 mA cm <-2 >, and obvious performance degradation does not occur when the AEM stably operates for 70 h under the large current density of 100 mA cm <-2 >. Compared with an existing electrolyzed water electrode, the method has the characteristics that active sites are accurately regulated and controlled, the structural stability is improved, and the process cost is reduced.