240 results about "Porous electrode" patented technology

The invention provides an electric pile operation state stress characteristic evaluation method based on finite element analysis. The electric pile operation state stress characteristic evaluation method comprises the following steps: S1, modeling and assembling according to a physical structure of a solid oxide electric pile to form a full-size electric pile model; s2, simulating a co-sintering process of a porous electrode and a thin-layer electrolyte in the full-size galvanic pile model, obtaining residual stress and a first stress parameter, and calculating first elastic stress and first inelastic stress; s3, acquiring assembly stress and second stress parameters generated in the assembly process, and calculating second elastic stress and second inelastic stress; s4, heating the solid oxide galvanic pile through a temperature control furnace, obtaining thermal stress and third stress parameters, and calculating third elastic stress and third inelastic stress; and S5, integrating the elastic stress and the non-elastic stress as an electric pile operation state stress characteristic evaluation result. The method has the beneficial effects that the limitation in a complex stress coupling scene can be broken through, and the stress superposition effect at different stages can be quantified.

The utility model provides a battery capable of quantitatively repairing the capacity of a lithium ion battery. The battery capable of quantitatively repairing the capacity of the lithium ion battery comprises a shell, and a battery cell, an energy supplementing system and a battery management system which are arranged in the shell, the energy complementing system is connected with the battery management system through a wire harness; the battery cell comprises a cathode, a third electrode and an anode; the third electrode is used for supplementing lithium for the cathode and the anode; the third electrode is a porous electrode or a mesh electrode; the number of the negative electrodes and the positive electrodes is greater than or equal to 1; a layer of third electrode is arranged between each pair of negative electrode and positive electrode; the battery management system is connected with the negative electrode, the third electrode and the positive electrode through wire harnesses. The third electrode serving as a lithium supplementing electrode is arranged between the positive electrode and the negative electrode, the size of the third electrode is equivalent to that of the positive electrode, the third electrode is of a porous structure or a net structure, lithium ion transmission between the positive electrode and the negative electrode is not blocked, and the third electrode can stably exist in the electrolyte when not working (dormancy).

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.

An air-coupled ultrasonic scanning platform for an air-coupled ultrasonic non-contact metrology of battery electrodes that maps the local variation in density and thickness, and detect defects during electrode casting and drying, includes: piezocomposite air-coupled transducers (Ultran) at 0.5 to 1 MHz that provide sufficient air coupling to enable sound waves to travel through air from a transmitting transducer, through the thin film electrode coated on metal current collector, and then into the receiving transducer. Non-contact, air-coupled ultrasound may be used as a technique for evaluating battery electrode films. An analytical model was derived from fundamental acoustic wave propagation principles to determine acoustic density. Voltage gain or acoustic density maps of electrode films revealed features that are not visually apparent, attributed to mass gradients.

The invention belongs to the field of electrochemical energy storage, and discloses an electrode suitable for an organic flow battery and a preparation method of the electrode. The electrode comprises a porous electrode substrate and an amino functional group loaded on the surface of a pore channel, and the electrode substrate is prepared by taking mixed powder of noble metal, rare earth metal and titanium alloy as a raw material. A selective laser melting process is adopted to prepare a porous electrode substrate, and then an electrostatic self-assembly process is adopted to load amino functional groups on the surfaces of pore channels. The electrode has a porous structure with a high specific surface area, and can provide sufficient reaction sites for electrochemical reaction. Meanwhile, the loaded amino functional group can enhance the activity and stability of positive and negative electrode electrochemical substances. The electrode base material comprises a noble metal with catalytic activity and a rare earth metal, and an active rare earth oxide layer doped with a noble metal oxide can be formed on the surface of the electrode after printing. According to the electrode, the energy efficiency of the organic flow battery can be improved, and the stable cycle index and the service life are prolonged on the basis of maintaining the energy efficiency.

The invention belongs to the technical field of solid-state batteries, and provides a sodium ion solid-state electrolyte as well as a preparation method and application thereof. The electrolyte comprises a polymer matrix, sodium salt and a polar organic compound, the polymer matrix includes a first monomer and a second monomer. The preparation method comprises the following steps: mixing sodium salt and a polar organic compound to obtain a eutectic mixture; mixing a first monomer and a second monomer with the eutectic mixture to obtain a precursor solution; and coating a mold with the precursor solution, and curing. The invention also discloses a solid-state sodium ion battery comprising the electrolyte. The sodium ion solid electrolyte disclosed by the invention is high in room-temperature ionic conductivity, excellent in stretchability, high in breaking strength and tensile elongation and incombustibility. And by introducing the composite material into a porous electrode and tightly combining the composite material with active material particles in the electrode, the problem of stress failure of the electrode under low stacking pressure is solved, and good cycling stability of the all-solid-state battery under the low stacking pressure or even under the condition that no external pressure is applied is realized.

The invention belongs to the technical field of lithium extraction, and particularly relates to an electric de-intercalation and extraction lithium pole plate and a preparation method and application thereof.The electric de-intercalation and extraction lithium pole plate comprises a modified current collector which comprises a porous current collector base material and a conductive bottom coating, and the conductive bottom coating is arranged on the surface of the porous current collector base material; and the porous electrode slurry layer is arranged on the surface of the modified current collector.

The invention discloses a suspension electrolytic leaching method for a positive electrode material of a retired lithium ion battery. The method comprises the following steps: step 1, discharging, disassembling, pyrolyzing, crushing, sorting and sieving the waste lithium ion battery to obtain positive electrode material black powder; 2, mixing the black powder with a mediating agent according to an active substance proportion control method to obtain mixed black powder A; step 3, adding an acid and a surfactant into deionized water to obtain an electrolyte A; 4, mixing and stirring the electrolyte A and the mixed black powder A, and carrying out suspension electrolysis in an electrolytic tank containing a porous electrode under certain conditions; and fifthly, after suspension electrolysis is completed, the electrode is taken out, electrolyte is filtered, and leachate is obtained. Compared with the prior art, the method is wide in raw material applicability, large in treatment capacity, low in electrolysis energy consumption, free of gassing side reaction and high in production safety, and meanwhile efficient leaching is achieved.

According to the membrane-free electrochemical energy storage device, in the thickness direction of a partition plate, a first energy storage device and a second energy storage device are arranged on the two sides of the partition plate correspondingly and connected with the partition plate; the first energy storage device comprises a first end plate, a first sealing gasket, a first current collector, a first gas diffusion electrode, a first porous membrane, a first auxiliary electrode, a second porous membrane, a first porous electrode, a second current collector and a second sealing gasket; the second energy storage device comprises a second end plate, a third sealing gasket, a third current collector, a second gas diffusion electrode, a third porous membrane, a second auxiliary electrode, a fourth porous membrane, a second porous electrode, a fourth current collector and a fourth sealing gasket; the metal strip is connected between the first auxiliary electrode and the second auxiliary electrode. Therefore, the membrane-free electrochemical energy storage device provided by the invention can perform short-term energy storage and can also perform long-term energy storage, and the energy storage effect and the energy storage cost can be both considered.

A thermoelectrochemical converter is provided. The converter includes a working fluid, first and second coupled membrane electrode assemblies (MEAs), first and second heat transfer members, a heat sink, and a heat source. Each MEA includes a first porous electrode operating at a first pressure, a second porous electrode operating at a second pressure higher than the first pressure, and an ionically conductive membrane sandwiched therebetween. The first MEA compresses the working fluid and the second MEA expands the working fluid. The first heat transfer member is coupled to and in thermal engagement with the low pressure electrode of the first MEA. The second heat transfer member is coupled to and in thermal interface with the low pressure electrode of the second MEA. The heat sink is coupled to the low pressure side of the first MEA and the heat source is coupled to the low pressure side of the second MEA.

This invention belongs to the field of metal powder preparation technology, and discloses a porous nickel powder, its preparation method, and its applications. The method includes: preparing nickel oxalate powder as a precursor; forming a nickel coating layer on the surface of the nickel oxalate powder by chemical plating to obtain nickel oxalate@nickel core-shell structured composite particles; subjecting the composite particles to pyrolysis annealing treatment, causing the internal nickel oxalate to decompose and generate gas, and the external nickel coating layer to transform into a porous metal framework, thereby obtaining porous nickel powder. This method is simple, low-cost, and produces nickel powder particles with uniform size, stable pore structure, good connectivity, and large specific surface area, making it suitable as a precursor for electrocatalytic active materials or porous electrode materials.

The application discloses a multi-scale hierarchical porous electrode and a preparation method and application thereof, and relates to the technical field of electrode preparation. The multi-scale hierarchical porous electrode comprises a substrate and a carbon network modification layer modified in the substrate; the carbon network modification layer is formed by carbonization of amphiphilic polymers, the amphiphilic polymer molecular chains contain hydrophilic groups and hydrophobic groups at the same time, can be dissolved in water and oil respectively, and can play a stabilizing role at the liquid-liquid interface; the phase separation of the polymers between fibers is driven by solvent controlled evaporation, and solidification is achieved; and finally, the electrode is obtained by high-temperature carbonization. The application improves the active sites without destroying the macro-pores of the carbon cloth, adopts a liquid-liquid phase separation method to construct a multi-scale carbon network on the fiber surface in situ, spontaneously induces a surface tension during a solvent drying process, forms a modification structure with different pores on the surface of the carbon fiber and between the fibers, improves the electrochemical performance of the electrode, and can improve the energy and power density of the battery.

The present invention discloses an on-line detection method for the porosity of the electrodes of a dissolution-deposition type flow battery. The specific steps include: measuring the fiber diameter of the porous electrode, then assembling the flow battery and injecting the discharged-state electrolyte; recording the pressure of the electrode to be measured under the rated flow rate; calculating the electrode permeability according to the measured pressure, flow rate, as well as the geometric dimensions of the electrode and the viscosity of the electrolyte; calculating the electrode porosity according to the electrode permeability and in combination with the fiber diameter of the electrode; successively charging the battery to different state of charge and measuring the electrode permeability at each state; fitting a pressure-permeability equation according to the measured electrode permeability and pressure data; inputting the fitting equation into the battery management system to directly read the electrode permeability under the operating state, or reading the pressure and then calculating the real-time electrode permeability by using the fitting equation. This method has a convenient process, does not require complex equipment, has a low cost, and realizes the on-line measurement of the porosity of the electrodes of the dissolution-deposition type flow battery.

The application relates to a control method and device of a massage instrument, the massage instrument and a storage medium. The massage instrument comprises an electrode assembly for outputting an electric pulse signal and a liquid storage device for storing conductive liquid, and the electrode assembly comprises at least one group of micro-porous electrode pairs; the method comprises the following steps: detecting a wearing state of the massage instrument; when the massage instrument is in the wearing state, the conductive liquid stored in the liquid storage device is introduced into the electrode assembly, and the conductive liquid is exuded through the micro-pores on the micro-porous electrode pairs in the electrode assembly. The scheme provided in the application can increase the contact area between the skin of a user and the electrode assembly, reduce the impedance value of the electrode assembly, and improve the use experience of the user.

A system and method for producing a porous electrode with a high level of porosity, preferably mesoporosity, without the use of a binder. The electrode is formed by depositing a layer on a substrate from a colloidal suspension containing aggregated or agglomerated nanoparticles. Deposition methods include electrophoresis, ink-jet printing, doctor blade, roll coating, curtain coating, or dip-coating. The process includes drying and may involve additional consolidation steps such as pressing and / or heat treatment to enhance structural integrity, electrical conductivity, and adhesion. The heat treatment induces partial coalescence of nanoparticles, creating a three-dimensional porous structure that facilitates ion mobility. A thin coating of an electrically insulating or ion-conductive material may be applied to reduce interfacial reactions. The resulting porous electrode may be used in energy storage applications, such as lithium-ion batteries. The invention also includes a method for manufacturing batteries utilizing these electrodes and related battery designs.

The invention belongs to the technical field of solid-state batteries, and provides a lithium-ion solid-state electrolyte and a preparation method and application thereof. The electrolyte comprises a polymer matrix, a lithium salt and a polar organic compound, the polymer matrix includes a first monomer and a second monomer. The preparation method comprises the following steps: mixing a lithium salt and a polar organic compound to obtain a eutectic mixture; mixing a first monomer and a second monomer with the eutectic mixture to obtain a precursor solution; and coating a mold with the precursor solution, and curing. The invention also discloses a solid-state lithium ion battery comprising the electrolyte. The lithium ion solid electrolyte disclosed by the invention is high in room-temperature ionic conductivity, excellent in stretchability, high in breaking strength and tensile elongation and incombustibility. And by introducing the composite material into a porous electrode and tightly combining the composite material with active material particles in the electrode, the problem of stress failure of the electrode under low stacking pressure is solved, and good cycling stability of the all-solid-state battery under the low stacking pressure or even under the condition that no external pressure is applied is realized.

The application relates to a double-layer polymer film-based rechargeable moisture power generation device and a preparation method thereof, and belongs to the technical field of moisture power generation. The device comprises an active electrode, a double-layer polymer film and an inert porous electrode which are sequentially arranged, wherein the first layer polymer film of the double-layer polymer film is a mixture of iron hydroxide, polystyrene sulfonic acid and polyvinyl alcohol, the second layer polymer film is polydiallyldimethylammonium chloride, the first layer polymer film is in contact with the active electrode, and the second layer polymer film is in contact with the inert porous electrode; the material of the active electrode is a metal with a standard electrode potential of-1V to +0.5V, and the material of the inert porous electrode is a metal with a standard electrode potential greater than +1V. Through moisture evaporation and redox reaction, the battery can generate power spontaneously in a moisture environment, and can be self-repaired through the redox reaction when the performance decreases, so that the charging effect is realized.

The invention relates to the technical field of new energy hydrogen production and chemical coupling application, and discloses a natural gas hydrogen-doped pipeline conveying system which comprises an energy supply layer, a chemical production layer, a digital integrated platform and a dispatching control module. The energy supply layer integrates photovoltaic power, wind power, nuclear power and a power grid standby power supply through a direct-current micro-grid, is matched with a sodium ion flow battery energy storage system, and supplies energy to the water electrolysis hydrogen production system of the non-noble metal catalyst and porous electrode structure. In the chemical production layer, pipeline steel or double-layer alloy steel is selected as a hydrogen-doped pipeline according to the proportion, a hydrogen concentration monitoring and sound wave leakage detection system is arranged, the hydrogen-doped safety upper limit of high pressure of 10% and low pressure of 30% is set, and a chemical hydrogen using system is connected through a gas distribution valve set and adjusted by an intelligent module. The digital platform is based on monitoring of the Internet of Things, hydrogen doping is optimized by means of a fuzzy PID algorithm and digital twinning, and risks are early warned. The scheduling module combines wind and light prediction and real-time electricity price, optimizes the start and stop of the electrolytic cell, the hydrogen doping ratio and the conveying pressure, and achieves efficient and stable conveying.

The application relates to an electrochemical cell for an electrocatalytic reaction of organic substrates to form a reaction product and a corresponding electrocatalytic process. The electrochemical cell comprises a first, porous electrode and a second electrode in a first and a second compartment (an oxidation compartment and a reduction compartment). The first and second compartments are separated by the first electrode, wherein the first electrode comprises a catalyst layer, a hydrophobic membrane is arranged on the side of the first electrode facing away from the second compartment, and a hydrophilic membrane is arranged on the side of the first electrode facing the second compartment. The hydrophilic membrane comprises an ionomer.

This invention provides a continuous sludge carbonization device based on porous electrode vacuum pyrolysis, comprising a reactor with a sludge conveying channel on the bottom surface of the inner wall of the reactor, and an extension pipe connected to the sludge conveying channel fixedly installed on the outer wall of the reactor. This invention achieves continuous sludge conveying within the sludge conveying channel, receiving tank, and extension pipe through a motor-driven rotating shaft and three-section spiral blades. Combined with the sludge-breaking effect of baffles and through-holes, the contact area between the sludge and the pyrolysis components is increased, improving pyrolysis efficiency. Simultaneously, a stirring component thoroughly stirs the sludge during the preheating stage to prevent clumping and ensure uniform heating. This works closely with the subsequent continuous conveying process to achieve continuous sludge treatment from feed to discharge, improving sludge carbonization efficiency. The vacuum environment (-90 kPa) lowers the boiling point of organic matter, and the 200-300°C Joule heat generated by the energized double-layer honeycomb porous electrodes achieves low-temperature sludge pyrolysis.

The application relates to the technical field of sewage treatment, and discloses a perfluorooctyl sulfonic acid in-situ remediation multi-layer porous electrode electrochemical oxidation device which comprises a protective cover internally provided with a pipeline; an electrode plate which is arranged below the protective cover in parallel with the protective cover and is in communication with an external power supply; and a reaction grid which is arranged in underground water and is fixedly connected between the protective cover and the electrode plate, the top end of the reaction grid is in communication with the water channel in the protective cover, and the bottom end of the reaction grid is electrically connected with the electrode plate, wherein an oxidant is injected into the reaction grid through the pipeline to generate free radicals through electrochemical oxidation, and the free radicals are used for removing perfluorooctyl sulfonic acid pollutants in the underground water. The application can realize efficient underground water remediation, achieves satisfactory pollutant removal effect in a short time, can realize efficient utilization of resources, can be suitable for various underground water environments, and ensures that the remediated underground water meets environmental protection requirements.

The utility model discloses a graphene capacitor with a hierarchical pore structure, and belongs to the technical field of graphene capacitors. The graphene capacitor with the hierarchical pore structure comprises the capacitor shell and the separation frames, the number of the separation frames in each group is five, the two groups of separation frames are arranged at the upper end and the lower end of the capacitor shell respectively, and the number of the electrode plates can be conveniently regulated and controlled through the multiple separation frames. According to the utility model, the problems that the pore structure of the existing graphene capacitor cannot be adjusted according to the actual demand and the applicability is poor in the actual use process are solved, the electron conduction path can be optimized through the pore distribution in the porous electrode, and if the continuous conduction of electrons is influenced by the existence of the pores, the graphene capacitor can be applied to the electronic device. The electrode plates with different porosities are selected, so that good ion conduction can be ensured, good electron conduction performance can be maintained, and the electrode can adapt to different working types so as to achieve the optimal use effect.

The invention relates to the technical field of textile, and discloses a micro-nano flame-retardant yarn preparation device and method using electrostatic-airflow forming, and the method comprises the following steps: S1, immersing a to-be-coated web in 0.5-3wt% of a cationic modifier solution, and drying to form a modified web with positive charges; s2, mixing the polymer and the halogen-free flame retardant in proportion, and then adding a solvent to prepare a spinning solution with the concentration of 20-70% and the viscosity of 16.50-19.50 cp; s3, adding the spinning solution into an electrostatic-airflow forming device, spraying the flame-retardant nanofibers on a conveyed cotton web by using a double-air-jet system, and directionally arranging the nanofibers and uniformly loading the nanofibers on the surface of the cotton fiber by using a directional negative-pressure porous electrode receiving system and a negative-pressure air suction device; and S4, after passing through a bundling and slivering device, drafting and twisting into yarns through a spinning process. The electrostatic-airflow forming technology is combined, so that the flame-retardant nanofibers are tightly and uniformly combined on the surfaces of the cotton fibers and are directionally arranged, the distribution uniformity of flame-retardant components is greatly improved, and the flame-retardant effect and the mechanical property are enhanced.

This invention provides a method for enhancing the chemical reaction of a flow battery based on localized ultrasound assistance, comprising the following steps: (1) setting an ultrasonic transducer on the bipolar plates of the positive and negative half-cells of the flow battery. The position and size of the ultrasonic transducer on the bipolar plates should ensure that the area of ​​action of the ultrasound applied by the ultrasonic transducer covers the flow dead zone inside the porous electrode; (2) connecting a signal generator to the ultrasonic transducer via a power amplifier; (3) during the operation of the flow battery, turning on the signal generator and power amplifier to apply ultrasound to the flow battery through the ultrasonic transducer, thereby improving the flow rate and flow uniformity of the electrolyte in the porous electrode and enhancing the chemical reaction of the flow battery. The method of this invention can effectively improve the flow uniformity of the electrolyte inside the porous electrode, realize flexible control of the flow field inside the porous electrode of the flow battery, and reduce the ultrasonic power consumption for flow field control inside the electrode.

The present invention discloses N + Ion-modified α-PbO porous electrode, preparation method thereof, and application in electrocatalytic synthesis of sodium borohydride. The preparation process of the porous electrode is as follows: β-PbO powder is first ball-milled, and then stirred with a N-containing cationic surfactant solution to form N on the surface of α-PbO. + Modification, mixing with sodium metaborate, conductive powder and paraffin, grinding, tableting, embedding in alumina and sintering, the preparation is completed. + Modification can improve the double electric layer structure of the catalytic electrode surface and promote the reaction of B(OH)4 ‑ At the same time, the modified catalyst surface is easy to form Pb-N-O bonds, which enhances the adsorption of OH and helps activate the reactants on the catalyst surface. + The ion-modified α-PbO porous electrode has high efficiency in the solid-phase electrolysis synthesis of sodium borohydride. The current efficiency of the electroreduction synthesis of sodium borohydride in alkaline sodium metaborate solution can reach above 67.6%.

The invention relates to the technical field of batteries, in particular to a common flexible thin film solid-state ion battery based on ultra-high molecular weight polyethylene and a preparation method of the common flexible thin film solid-state ion battery. The preparation method of the common flexible film solid-state ion battery based on the ultra-high molecular weight polyethylene comprises the following steps: S1, preparing a porous electrode; s2, preparing a diaphragm substrate; s3, preparing a current collector; and S4, assembling the battery. According to the method, efficient and low-cost manufacturing of the battery can be realized, and the battery has high interface stability, high ionic conductivity and excellent mechanical flexibility. The general flexible thin film solid-state ion battery based on the ultra-high molecular weight polyethylene is prepared by the preparation method; comprising a solid electrolyte layer, a porous electrode and a current collector, and the solid electrolyte layer is compounded on one side of the porous electrode through hot pressing; the current collector is an integrated current collector, and the integrated current collector is integrated on the other side of the porous electrode through a coating process; or the current collector is a porous current collector conductive film, and the porous current collector conductive film is compounded on the other side of the porous electrode through hot pressing. The battery has flexibility, safety and high energy density, the porous electrode and the solid electrolyte layer are firmly combined, the battery can be repeatedly bent without influencing the performance, and the battery is suitable for flexible electronic and wearable equipment.

The invention relates to a method for detecting the infiltration state of a lithium ion battery, which comprises the following steps of: performing in-situ electrochemical impedance spectroscopy test on the lithium ion battery in a liquid injection infiltration process to obtain impedance spectroscopy data changing along with infiltration time; performing fitting processing on the impedance spectrum data by using a preset equivalent circuit model; wherein the equivalent circuit model comprises a transmission line model element used for representing the impedance characteristic of the porous electrode; extracting a capacitance value corresponding to the transmission line model element from the fitting result; determining the infiltration state of the lithium ion battery according to the variation trend of the capacitance value along with the infiltration time; wherein the increasing rate of the capacitance value is positively correlated with the infiltration rate of the electrolyte in the lithium ion battery. The invention also relates to equipment for detecting the infiltration state of the lithium ion battery, a medium and a computer program product.

The utility model is applicable to the technical field of battery simulation, and provides a flow battery based on a bionic vein-shaped runner, which comprises two electrode modules and an ion exchange membrane, and the two electrode modules are connected with each other through the ion exchange membrane; the electrode module comprises a runner plate and a porous electrode, and the runner plate is provided with a liquid inlet runner, a liquid outlet runner and a plurality of branch runners; the liquid inlet runner is positioned in the center of the runner plate, and the liquid outlet runners are positioned at four corners of the runner plate; the branch flow channels are sequentially arranged between the liquid inlet flow channel and the liquid outlet flow channel to form a vein-shaped flow channel form; the branch flow channels are arranged in a central symmetry mode and communicate with the liquid outlet flow channel. According to the flow battery, a vein fractal flow channel technology is developed based on a biological mimicry principle, and double advantages of a radial main vein and a fractal secondary network are fused, so that electrochemical reaction rates of all parts of the surface of the electrode are kept highly consistent, and the overall capacity of the battery is remarkably improved.

The invention discloses a composite porous electrode material as well as a preparation method and application thereof. The composite porous electrode material takes a cellulose nanofiber porous composite material as a carrier and is loaded with a metal oxide active component; the metal oxide is one or more modified structures constructed by heteroatom doping and oxygen vacancy defects. The efficient photoelectric cathode integrating CO2 adsorption and catalytic conversion is constructed, and the effect of remarkably improving CO2 reduction activity and product selectivity is achieved.

The application belongs to the technical field of fuel cell membrane electrode, and specifically discloses a porous cathode electrode preparation method based on pore forming by bubble precipitation. The preparation method comprises the following steps: step 1, preparing a conventional cathode catalyst layer; step 2, assembling an electrolysis electrode structure; and step 3, electrolyzing the cathode catalyst layer, and controlling the gas distribution on the ionomer film and the pore structure of the catalyst layer generated by the catalytic site. The application controls the bubble precipitation of the catalytic site, forms pores on the ionomer film and the electrode pore structure, controls the ionomer distribution, increases the catalyst layer pores, increases the transmission channel of oxygen molecules in the catalyst layer to the catalytic site, and reduces the local and bulk mass transfer resistance of oxygen. The new porous electrode structure as a proton exchange membrane fuel cell cathode, and the proton exchange membrane and the anode form an efficient oxygen mass transfer membrane electrode, and has a wide application prospect.