95 results about "Air cathode" patented technology

The invention relates to a lithium ion conductive dense membrane and a preparation method and application thereof. The lithium ion conductive dense membrane comprises a polymer base membrane, ion conductive inorganic particles and a polymer solid electrolyte, the polymer base membrane is of a net structure; the Gurley value of the lithium ion conductive dense film is larger than or equal to 1000, and the porosity is smaller than or equal to 5%. The lithium ion conductive dense membrane provided by the invention has the advantages of high lithium ion conductivity, high transport efficiency and high lithium ion selectivity, and can be applied to electrodialysis lithium extraction. And under the action of external voltage, lithium ions are directionally migrated to the air negative electrode subjected to oxygen reduction reaction through the lithium ion conductive dense membrane to form a lithium hydroxide solution, and other metal hetero-ions are isolated on the positive electrode side by the lithium ion conductive dense membrane, so that lithium enrichment is realized. And meanwhile, transportation of the membrane to lithium ions does not depend on pores in the conductive membrane, so that the service life can be prolonged while the lithium ion separability and the transportation efficiency of the salt lake lithium extraction method are improved.

The invention discloses a single-chamber electro-Fenton antibiotic mineralization device and method based on double anodes, in the device, an air cathode, a first anode and a second anode are sequentially arranged in a single chamber, an electrolyte contains antibiotics, the first anode comprises an electrogenesis biological membrane and in-situ synthesized nano FeS, and the second anode comprises an electrogenesis biological membrane and in-situ synthesized nano FeS; the second anode comprises a degradation biological membrane of a typical antibiotic degradation intermediate, and the surface of the air cathode is coated with an aerobic reduction catalyst. The first anode is used for driving Fe (III) / Fe (II) circulation, generation of OH is accelerated, meanwhile, nano FeS is used for protecting cells from being damaged, and therefore the antibiotic degradation efficiency is improved, and generation of intermediates is promoted; the second anode is used for promoting anode biodegradation to be coupled with cathode chemical oxidation, the intermediate is rapidly mineralized, electrons are released to drive the cathode electro-Fenton reaction, and finally thorough mineralization of the antibiotics is achieved. The device and the method provided by the invention can realize high-efficiency green low-carbon treatment of antibiotic wastewater, and have important application prospects in the aspects of environmental protection and resource utilization.

The invention belongs to the technical field of air power supplies, and relates to modification treatment of an oxide, in particular to a cerium oxide doped transition metal oxide and a preparation method thereof, an air cathode and an air power supply. The preparation method comprises the following steps: dissolving cerium salt, cobalt salt and manganese salt in water, uniformly mixing to obtain a mixed solution, adjusting the pH value of the mixed solution to 9-11, and carrying out a sedimentation reaction to obtain a sediment; and drying the precipitate, and calcining in an air atmosphere at 300 + / -10 DEG C for 2-4 hours to obtain the cerium oxide doped transition metal oxide. The cerium oxide doped transition metal oxide is cerium doped cobalt manganese oxide with a spinel structure, and the doping amount of cerium is 20 + / -1wt%. The cerium oxide doped transition metal oxide provided by the invention is applied to an air cathode as a catalyst, and has good stability and high catalytic activity. The performance of an air power supply containing the oxide is remarkably improved. The method for preparing the oxide provided by the invention is simple and easy to operate, and is suitable for large-scale production.

The invention provides a preparation method of an air cathode material of a mesoporous Cu-N-C zinc-air battery. The preparation method comprises the following steps: 1, uniformly spreading a zinc-based imidazole framework precursor embedded with SiO2 nanoparticles in a corundum boat, placing the corundum boat in the center of a tubular furnace, and carrying out pre-pyrolysis in an Ar atmosphere to obtain nitrogen-doped carbon NC powder containing SiO2 nanoparticles; and 2, removing the SiO2 nanoparticles by using a 40% hydrofluoric acid solution to obtain the mesoporous NC powder. And 3, preparing a copper ammonia ion [Cu (NH3) 4] < 2 + > solution with a certain concentration, adding the mesoporous NC powder, carrying out ultrasonic treatment at room temperature, stirring, and carrying out high-temperature pyrolysis to obtain the mesoporous Cu-N-C material. The material has rich mesoporous structures and excellent oxygen reduction activity, and realizes high power density and excellent charge-discharge cycle stability when being used as an air cathode of a zinc-air battery.

The invention relates to a flexible breathable zinc air battery based on a polypropylene non-woven fabric and a preparation method thereof. The preparation method comprises the following steps: carrying out hydrophilic treatment on the polypropylene non-woven fabric; immersing a hydrophilic polypropylene non-woven fabric into the carbon nanotube dispersion liquid, and drying to obtain a carbon nanotube non-woven fabric; the method comprises the following steps: coating a carbon nanotube non-woven fabric with ink containing a copper / cobalt double-atom doped oxygen electrocatalyst, and drying to obtain a breathable air cathode; the carbon nano tube non-woven fabric is electroplated and loaded with zinc, and an air-permeable galvanized anode is obtained; the preparation method comprises the following steps: immersing hydrophilic polypropylene non-woven fabric into a polymer gel solution, taking out the hydrophilic polypropylene non-woven fabric to form non-woven fabric-based polymer gel under ultraviolet irradiation, soaking the non-woven fabric-based polymer gel into a mixed solution of KOH and Zn (Ac) 2, and taking out the non-woven fabric-based polymer gel to obtain a non-woven fabric-based alkaline gel polymer electrolyte; and (3) sequentially laminating and pressing the anode, the polymer electrolyte and the cathode, and then packaging. The flexible, breathable, waterproof and tailorable characteristics of the zinc-air battery are realized.

The invention relates to an iron single atom / zinc atom cluster-nitrogen-carbon composite material as well as a preparation method and application thereof. Zinc nitrate hexahydrate, ferric acetylacetonate and dimethylimidazole are used as raw materials, and the iron single atom / zinc atom cluster-nitrogen-carbon composite material FeSA / ZnAC-N-C is prepared through stirring and thermal shock at room temperature. The preparation method comprises the following steps: a, stirring at room temperature to prepare an iron-zinc bimetallic zeolite imidazole organic framework FeZn-ZIF precursor; and b, carrying out thermal shock on the precursor to prepare the FeSA / ZnAC-N-C. The FeSA / ZnAC-N-C shows excellent oxygen reduction reaction (ORR) catalytic performance, the half-wave potential is 0.90 V, the Tafel slope is 46.4 mV dec-1, and the performance exceeds that of commercial Pt / C. Besides, the zinc-air battery constructed by taking FeSA / ZnAC-N-C as the air cathode can reach the maximum power density of 161.5 mW cm <-2 > and the specific discharge capacity of 792.7 mAh g <-1 >, can stably circulate for 1500 circles, and shows good practical application value. The preparation method can be expanded to preparation of other monatomic / atomic cluster composite materials, and a new idea is provided for development of efficient electrocatalysts.

The invention provides a preparation method of a Cu particle-loaded spongy nitrogen-doped carbon material and an air cathode of a zinc-air battery. The preparation method comprises the following steps: dispersing Cu-ZIF into a mixed solvent of N, N-dimethylformamide and absolute ethyl alcohol, and naming as A; dissolving zinc nitrate hexahydrate, pyrazine and polyvinylpyrrolidone into a mixed solvent of DMF (Dimethyl Formamide) and absolute ethyl alcohol, and naming as B; the preparation method comprises the following steps: dissolving meso-tetra (4-carboxyphenyl) porphin into a mixed solvent of DMF and absolute ethyl alcohol, and naming as C; and pouring the dispersion liquid A into the dispersion liquid B, uniformly stirring, dropwise adding the solution C into the dispersion liquid B, stirring at room temperature, heating in a water bath, centrifuging, washing and drying to obtain the Cu-ZIF-coated TCPP. And carrying out high-temperature pyrolysis on the Cu-ZIF-coated TCPP in a tubular furnace to obtain the Cu-coated NC composite material. The material has a rich pore structure, efficient oxygen reduction activity and excellent stability, has a certain application prospect in the field of oxygen reduction, and realizes high power density and excellent charge-discharge cycle stability as an air cathode of a zinc-air battery.

The invention discloses a synthesis method and application of nitrogen-doped carbon-coated Co porous spheres, cobalt nitrate hexahydrate and 4-picolinic acid are dissolved in a mixed solution, the mixed solution comprises dimethylformamide and absolute ethyl alcohol, then the mixed solution is transferred into a reaction kettle for heating reaction, and after the reaction is finished, centrifugal drying is performed to obtain a Co coordination compound precursor; and calcining the precursor in an argon hydrogen atmosphere, and selecting and setting a proper heating rate, a proper calcining temperature and a proper calcining time to obtain the nitrogen-doped carbon-coated Co porous ball. The obtained nitrogen-doped carbon-coated Co porous ball is used as the air cathode of the zinc-air battery, so that high power density and excellent charge-discharge cycle stability are realized.

The utility model discloses an exhaust device for a copper electrolytic liquid separation tank. The device sequentially connects an electrolyte circulation tank, an electrolyte circulation pump, a liquid separation tank and an electrolytic tank through pipelines. The electrolytic tank is then connected to the electrolyte circulation tank through pipelines. A liquid separation tank exhaust port is arranged on the top of the liquid separation tank. After all the electrolyte is gathered in the liquid separation tank, the air in the electrolyte is gathered to the liquid separation tank exhaust port and discharged due to the light density of the air, thereby achieving the discharge of the air mixed in the electrolyte, avoiding the problems of air mixed in the electrolyte and pitting of cathode copper, and improving the physical appearance quality of the cathode copper.

The invention discloses an air cathode Sn-CoSb / NC of a zinc-air battery and a preparation method of the air cathode Sn-CoSb / NC. The preparation method comprises the following steps: preparing a cobalt-doped ZIF-8 (Co-ZIF-8) precursor: mixing a methanol solution of dimethylimidazole with a methanol solution of zinc nitrate hexahydrate and cobalt nitrate hexahydrate, stirring at room temperature for 24 hours, centrifuging, washing and drying to obtain the Co-ZIF-8 precursor; the preparation method comprises the following steps: taking a small amount of N, N-dimethylformamide (DMF), adding tin tetrachloride pentahydrate and antimony trichloride, and stirring until the tin tetrachloride pentahydrate and the antimony trichloride are completely dissolved; then adding Co-ZIF-8 powder into the solution, stirring for 5 hours at room temperature, and then centrifuging and drying to obtain purple powder; and placing the powder in a tubular furnace, and carrying out high-temperature pyrolysis in an inert atmosphere to obtain the Sn-CoSb / NC electrocatalyst. The novel catalyst has excellent ORR functional activity, and as an air cathode of a zinc-air battery, high power density and excellent charge-discharge cycle stability are realized.

The invention belongs to the technical field of biosensors and environmental monitoring, and particularly relates to an MFC sensor loaded with an interpenetrating network nanofiber anode and application of the MFC sensor. Interpenetrating network nanofibers are prepared by adopting an electrostatic spinning technology and are loaded on a stainless steel mesh bracket to serve as a sensor anode electrode, and a titanium wire is connected with an air cathode through an external circuit to assemble the MFC sensor. The nanofiber has ultra-long length, high length-width ratio, specific pore structure, great specific surface area and high porosity, and has good biological compatibility with electrogenesis microorganisms, and the one-dimensional nanostructure can promote transmission of electrons from a biological membrane to an anode, so that an electric signal output by the sensor is enhanced. Therefore, when the prepared novel MFC sensor is applied to concentration analysis of pollutants in wastewater and early warning of toxic substances, the sensitivity can be greatly improved, and the response time can be greatly shortened.

The invention belongs to the technical field of sodium hypochlorite preparation, and provides a hydrogen-free sodium hypochlorite preparation system and a sodium hypochlorite preparation technology.The sodium hypochlorite preparation system comprises a brine electrolysis device, and a liquid inlet of the brine electrolysis device communicates with a pipeline mixer through an electrolyte conveying pipeline; a liquid inlet of the pipeline mixer is respectively communicated with a saturated salt water preparation device and a saturated salt water dilution device, a liquid outlet of the salt water electrolysis device is communicated with a sodium hypochlorite storage tank through a sodium hypochlorite conveying pipeline, and a liquid outlet of the sodium hypochlorite storage tank is communicated with a metering and adding device; the brine electrolysis device comprises an air cathode electrolytic cell and a rectification power supply, the air cathode electrolytic cell comprises a cell body, the cell body is provided with a containing cavity for containing electrolyte, and an anode and a cathode which are electrically connected with the rectification power supply are fixedly installed on the cell body. According to the method, the sodium hypochlorite solution is prepared efficiently and safely, no hydrogen is generated in the electrolysis process, the operation safety is remarkably improved, and the method is safer and more environmentally friendly.

The invention discloses a preparation method of an AB-N-P-x microbial fuel cell (MFCs) air cathode catalyst, relates to a preparation and modification method of a microbial fuel cell cathode catalyst, and solves the problem of low electricity generation performance of an existing air cathode. The method comprises the following steps: pretreating straws by using melamine, KOH and KHCO3, then calcining in a programmable tubular furnace at 900 DEG C for 2 hours to obtain a black product, and pickling, washing and drying the black product in 1M hydrochloric acid. And putting NaH2PO4 into the upstream of a programmable tubular furnace, putting the dried black product into the downstream of the programmable tubular furnace, and calcining at 350 DEG C for 2 hours to complete the preparation of the AB-N-P-x microbial fuel cell cathode catalyst. According to the modified cathode catalyst obtained by the invention, through the synergistic effect of heteroatoms P and N, the performance of active sites is enhanced, and the electrode power generation efficiency is improved, so that the performance of the microbial fuel cell is improved.

A method and apparatus for generating electricity using an electrochemical dual-pole fuel cell with a coiled aluminum wire disc as the anode, dual air-cathodes, and dual bioplastic electrolyte discs. The invention teaches the use of inexpensive materials and simplified dual-pole fuel cell construction and assembling of fuel cells into modules, and modules into electricity generators.

The invention relates to the technical field of zinc-air batteries, and particularly discloses a quasi-solid zinc-air battery cathode material as well as a preparation method and application thereof. According to the cathode material, carbon black particles with aminated surfaces are used as a carrier, and ruthenium-cobalt bimetallic active components are loaded as a catalytic center. The preparation method of the cathode material comprises the following steps: dispersing aminated carbon black particles, ruthenium metal salt and cobalt metal salt in a water / methanol mixed solution, carrying out ultrasonic dispersion, and carrying out a hydrothermal reaction at a certain temperature; centrifuging, washing and drying the reaction product to obtain a solid precursor; and finally, carrying out thermal annealing treatment on the solid precursor under the inert gas protection condition to obtain the cathode material. The cathode material provided by the invention is suitable for an air cathode of a quasi-solid-state zinc-air battery, and has good catalytic activity and application prospect.

The invention discloses a modular series-parallel energy storage stack type microbial fuel cell sewage treatment system, and relates to the technical field of energy utilization in sewage treatment. Comprising a box body, a plurality of anode chambers, air cathodes and anodes, the anode chambers are arranged in the box body, and the air cathodes and the anodes are arranged on the anode chambers; the box body is of a rectangular cavity structure with an open top, a plurality of vent holes are evenly formed in the edge of the top of the box body, a water conveying opening is formed in the bottom of the box body, an anode chamber supporting frame is fixedly arranged at the inner bottom of the box body, and a fixing column is arranged at the included angle of the anode chamber supporting frame. According to the modular series-parallel energy storage stack type microbial fuel cell sewage treatment system adopting the structure, the problems that an existing stack type microbial fuel cell sewage treatment system is relatively low in treatment efficiency, low in output electric energy grade, inconvenient to maintain, poor in adaptability and the like are solved; the sewage treatment efficiency, the energy recovery quality, the maintenance convenience and the scene adaptability of the system are improved.

Disclosed is a power cell that includes a metallic anode; an air cathode; an electrolyte, the electrolyte placing the metallic anode into electronic communication with the air cathode; and an enclosure, the enclosure encapsulating therein the metallic anode, the air cathode, and the electrolyte. The enclosure can include an air path and minimize the exposure of the battery to the external environment while allow the sufficient air flux for battery operation, and the enclosure can comprise a biodegradable material, such as a wax. Also disclosed is a method, comprising implanting a power cell according to the present disclosure into a soil environment. Also described is a method, comprising assembling a power cell according to the present disclosure. Further provided is a method, comprising powering a device using a power cell according to the present disclosure.

The invention relates to a preparation method and application of an iron / antimony diatom-nitrogen-carbon (Fe / Sb-N-C) composite material. The composite electrode is prepared according to the following steps: a, stirring at room temperature to synthesize a zeolite imidazole organic framework precursor (ZIF-8); b, preparing nitrogen-doped carbon through an annealing method; c, preparing a Fe / Sb-N-C precursor through solution dipping; and d, the Fe / Sb-N-C composite material is prepared through an annealing method. Fe / Sb-N-C shows excellent oxygen reduction reaction (ORR) catalytic performance, the half-wave potential is 0.92 V, the Tafel slope is 46.3 mV dec-1, and the performance is superior to that of commercial Pt / C. Besides, the zinc-air battery constructed by taking Fe / Sb-N-C as the air cathode can reach the maximum power density of 196mW cm <-2 > and the specific discharge capacity of 795mAh g <-1 >, can stably circulate for 1000 circles, and shows good practical application value. The preparation method can also be expanded to design of other diatomic composite materials, and a new idea is provided for development of efficient electrocatalysts.

The present disclosure provides a metal-air battery. The metal-air battery may include an air cathode, a metal anode, and an electrolyte including a surface-modifying surfactant. An electrolyte for a metal-air battery may include a surface-modified surfactant, wherein the surface-modified surfactant may include polyethylene glycol (PEG), monoalkyl polyethylene glycol, or a combination thereof.

The present invention discloses a preparation method and application of zinc single-atom loaded porous carbon nanotubes. The preparation method is as follows: Sodium tellurite is dissolved in an aqueous solution of polyvinylpyrrolidone, and then ammonia water and hydrazine hydrate are added. Tellurium nanowires are generated by a one-step hydrothermal method. After separating the tellurium nanowires, they are dissolved in deionized water to obtain an aqueous solution of tellurium nanowires; Glucosamine as a carbon source and zinc nitrate as a metal source are added to the aqueous solution of tellurium nanowires, stirred evenly, and then subjected to a hydrothermal reaction. The obtained black complex is freeze-dried to obtain a black aerogel, and after being subjected to high-temperature calcination treatment and cooled to room temperature, zinc single-atom loaded porous carbon nanotubes can be obtained. The porous carbon nanotubes prepared by the present invention not only have the advantages of large specific surface area, good conductivity, strong permeability, high temperature resistance, etc., but also have atomically dispersed Zn-N-C highly active sites to drive the oxygen reduction reaction, and can be used as a cathode oxygen reduction electrocatalyst in alkaline electrolytes and an air cathode catalyst in zinc-air batteries.

The present invention discloses an electrocatalyst for bifunctional oxygen reaction at the air cathode interface comprising manganese-cobalt-based bimetallic spinel oxide deposited on N-doped 3D porous entangled graphene (NEGF). The invention further provides fabricated all-solid-state rechargeable zinc-air batteries (ZABs) comprising said electrocatalyst coated air cathode that delivers a higher power density with stable cyclic stability.

The purpose of the present invention is to provide an air electrode / separator assembly exhibiting high activity as an electrode while having an extremely thin air electrode layer. This air electrode / separator assembly comprises: a hydroxide ion conduction separator that contains a hydroxide ion conduction solid electrolyte; and an air electrode layer that is provided on one surface side of the hydroxide ion conduction separator, and that contains an air electrode material and has a thickness of 2000 nm or less. The air electrode material is a material having both functions of an air electrode catalyst and an electron conductive material, and includes at least one metal element selected from the group consisting of Ni, Fe, Co, Mn, V, Mo, W, Cr, Pt, and Pd in at least one kind selected from the group consisting of (i) a metal carbide, (ii) a metal in which carbon is solid-dissolved, and (iii) a mixture of amorphous carbon and metal particles.

The invention belongs to the technical field of soil remediation, and particularly discloses a microbial remediation device and method.The remediation device comprises a box body, a power source, a wire and plants, an air cathode counter electrode is arranged at the bottom of the box body, and the position, above the air cathode counter electrode, in the box body is filled with contaminated soil; a surface active agent and a carbon felt anode are arranged in the contaminated soil, plants are planted in the contaminated soil, the outer side of the carbon felt anode is coated with a gel water retention layer, and the carbon felt anode is connected with a power source after being connected with a wire through a titanium wire. According to the microbial remediation device and method for the petroleum hydrocarbon contaminated soil, microorganisms are combined with an external electric field and a solid electrode, so that the problems that electron acceptors in the soil are deficient and the utilization rate is low are solved; meanwhile, the diversity of petroleum hydrocarbon pollutant removal ways is increased through intervention of the remediation plants, the remediation distance is increased, and a new method is provided for remediation of the low-carbon petroleum hydrocarbon contaminated soil.

A metal-air battery can include an air cathode, a metal anode, and an electrolyte including a surface-modified surfactant. The electrolyte for a metal-air battery can include a surface-modified surfactant, and the surface-modified surfactant can include polyethylene glycol (PEG), monoalkyl polyethylene glycol, or a combination thereof.

An air cathode and an aluminum-air battery, wherein the air cathode contains an active material, the active material being any one or a mixture of two of the following materials: nickel oxide, iron oxide, manganese oxide, lithium-ion nickel oxide, lithium-ion iron oxide, lithium-ion manganese oxide; strontium titanate doped with any one or two of iron, nickel, manganese, and lanthanum; calcium titanate doped with any one or two of iron, nickel, manganese, and lanthanum; magnesium titanate doped with any one or two of iron, nickel, manganese, and lanthanum; lanthanum nickelate doped with calcium and / or strontium; lanthanum ferrite doped with calcium and / or strontium; lanthanum cobaltate doped with calcium and / or strontium; lanthanum manganate doped with calcium and / or strontium; and graphite or metal carbonitride loaded with a metal.

The present application relates to hydrogen fuel cell system design technology, specifically relates to a kind of fuel cell system and control method;The system includes hydrogen anode module, air cathode module, air-cooled fuel cell stack and liquid-cooled fuel cell stack;Hydrogen bottle is connected with hydrogen gas shunt regulating device in hydrogen anode module;Hydrogen gas shunt regulating device is connected with air-cooled fuel cell stack and liquid-cooled fuel cell stack;Liquid-cooled fuel cell stack is connected with hydrogen gas shunt regulating device and liquid-cooled fuel cell stack;Air-cooled fuel cell stack is connected with hydrogen gas shunt regulating device and liquid-cooled fuel cell stack;Air-cooled fuel cell stack and liquid-cooled fuel cell stack are connected with exhaust and drainage structure;Air supply device in air cathode module is connected with air regulating device;Air regulating device is connected with the cathode of liquid-cooled fuel cell stack and the cathode of air-cooled fuel cell stack respectively;Liquid-cooled fuel cell stack is connected with the cathode of throttle valve;The present application improves the hydrogen utilization rate of overall fuel cell.

The present invention provides a modular microbial electricity-producing coupled photo / electrocatalytic energy-saving wastewater treatment system with an adjustable water level and an aeration-free cathode. The system inlet is industrial wastewater, which flows into the reactor from the bottom water inlet via a peristaltic pump, passes through the microbial anode chamber, a sand insulation layer, and an upper cathode chamber, and then flows out. Carbon rods are used as conductive media between the cathode and the anode. Filter cloths are used to isolate the various parts. When the wastewater flows out of the cathode area, it flows out in a tidal manner. When the cathode is located above the water layer, an air cathode is formed, which reduces the need for aeration, can meet the oxygen required for the cathode reaction, and save the electricity required for additional aeration. This reactor setting can not only reduce the footprint, but also utilize the ability of microorganisms to transform pollutants and generate electricity, coupled with the photoelectric response and catalytic ability of the cathode nanocatalyst, to improve the coupling system's ability to remove COD, TN, TOC, etc. in industrial wastewater.

An electrolysis cell 21 comprises: a solid electrolyte layer 211; a fuel electrode layer 213 that is disposed as a stack on one surface side of the solid electrolyte layer 211; and an air electrode layer 212 that is disposed as a stack on the other surface side of the solid electrolyte layer 211. The fuel electrode layer contains Fe. When a surface 213a1 on the solid electrolyte layer side of the fuel electrode layer is defined as a first surface and a surface 213b2 on the side opposite from the solid electrolyte layer side is defined as a second surface, n points pk (where k is an integer of 1 to n) are set in the fuel electrode layer along the thickness direction at intervals such that a point p1 is located at the first surface, a point pn is located at the second surface, and k increases in the direction from the first surface toward the second surface, and when a value obtained by dividing, by n, a cumulative value of the Fe concentration at each of the points from the point p1 to the point pk is defined as a normalized cumulative value Ck of the Fe concentration at the point pk, a normalized cumulative value Cn is 0.118-0.367 wt%.

The present invention adopts a one-step high-temperature pyrolysis method to prepare a trimetallic catalyst with high-efficiency oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) bifunctional catalytic activity, and the catalyst can be used as an ORR and OER catalyst for the air cathode of a zinc-air battery. The method is to use a mixture of ionic liquid (containing N, S, F, etc.), Fe salt, Zr salt, Ru salt, melamine, thiourea and graphene oxide as a precursor, and obtain a FeZrRu trimetallic bifunctional oxygen electrocatalyst by high-temperature pyrolysis, pickling and annealing. The method of the present invention is simple, and the prepared heteroatom-doped trimetallic bifunctional catalyst has good bifunctional catalytic activity and stability in alkaline conditions, and the self-assembled zinc-air battery also has a higher power density and a relatively stable charge and discharge cycle performance. The present invention provides a general strategy for the synthesis of high-performance trimetallic doped bifunctional oxygen electrocatalysts for metal-air batteries.

The present application relates to an electrochemical system and method for capturing carbon dioxide, regenerating pure carbon dioxide, and / or converting captured carbon dioxide to biomethane, syngas, formic acid, and combinations thereof. More specifically, the present application relates to an electrochemical cell having an air cathode-proton or cation exchange membrane and a non-biological or biological anode in which captured carbon dioxide is reduced to carbonate, which is then regenerated to pure carbon dioxide or transferred to another chemical production module. The regenerated carbon dioxide may be purified, compressed, or stored for later use. The present application includes volatile fatty acids derived from carbohydrate-rich waste. The present application also includes the ability to regenerate caustic absorbers used in initial carbon dioxide capture.