921results about "Fuel and primary cells" patented technology

The invention discloses a high-interface-stability composite solid electrolyte membrane as well as a preparation method and application thereof. The composite solid electrolyte membrane comprises a gradient aperture three-dimensional porous skeleton formed by sintering inorganic solid electrolyte particles, a polymer electrolyte filled in a pore channel, and a plastic interface stable layer positioned between the electrolyte membrane and an electrode. The preparation method comprises the following steps: preparing a gradient aperture porous framework through a pore-forming agent template method and a tape casting technology, dipping and filling a polymer electrolyte precursor solution in a solution, accelerating in-situ polymerization by adopting electric induction, and performing hot-pressing treatment. The composite solid-state electrolyte membrane has high ionic conductivity, excellent interface compatibility and high mechanical strength, can effectively inhibit the growth of lithium dendrites, can be applied to solid-state batteries such as lithium metal batteries, lithium sulfur batteries and lithium air batteries, and can remarkably prolong the cycle life and improve the safety performance of the batteries, and the preparation process is suitable for large-scale production.

Disclosed in the present invention are a biomass-derived graded porous asymmetric coordination monatomic carbon-based electrocatalyst, and a preparation method therefor and the use thereof. The preparation method for the biomass-derived graded porous asymmetric coordination monatomic carbon-based electrocatalyst comprises the following steps: (1) stirring and mixing de-alkalized lignin with a transition metal salt, a nitrogen-containing compound and a template, i.e., magnesium oxide, in a solvent until uniform, so as to obtain a suspension, wherein the transition metal comprises iron and zinc; (2) heating, evaporating and drying off the suspension, so as to obtain a lignin / metal ion / nitrogen-containing compound / template mixed precursor; and (3) subjecting the mixed precursor to high-temperature pyrolysis under the protection of an inert gas, cooling same, and then sequentially washing and drying same, so as to obtain a monatomic carbon-based electrocatalyst. The monatomic carbon-based electrocatalyst provided in the present invention has graded pores of micropores, mesopores and macropores, a surface nanosheet and an asymmetric coordination structure of Fe-N3O at the same time, and can be applied to fuel cells and metal-air cells.

An electrode stack can include a plurality of anode assemblies, each anode assembly including at least one anode layer attached to an anode tab; a plurality of cathode assemblies, each cathode assembly including at least one cathode layer attached to a cathode tab; a plurality of separators; an anode feedthrough bridge arranged to engage each anode tab of each of the plurality of anode assemblies; a cathode feedthrough bridge arranged to engage each cathode tab of each of the plurality of cathode assemblies; an anode feedthrough terminal coupled to the anode feedthrough bridge; and a cathode feedthrough terminal coupled to the cathode feedthrough bridge, wherein the plurality of anode assemblies and the plurality of cathode assemblies are alternately arranged and separated by the plurality of separators to form an electrode stack. A battery is also presented.

The invention discloses a fluorine-nitrogen-doped carbon-based oxygen reduction electrocatalyst for a zinc-air battery and a preparation method of the fluorine-nitrogen-doped carbon-based oxygen reduction electrocatalyst, and belongs to the technical field of catalysts. According to the method, a fluorocarbon mixture is rapidly treated through Joule heat to achieve efficient fluorine doping, then nitrogen doping is conducted through an ammonia gas plasma technology, and therefore an original carbon precursor is converted into fluorine-nitrogen-doped carbon. The catalyst material is short in preparation time and high in production efficiency, the content configuration of fluorine and nitrogen doped in fluorine-nitrogen-doped carbon finally formed by accurately controlling the temperature and time of Joule heat treatment and the power and time of plasma treatment is controllable, the morphology and the pore structure are controllable, high electro-catalytic performance is guaranteed, and the catalyst material is suitable for industrial production. The preparation method is high in production efficiency and low in cost, and has large-scale amplification potential.

The invention relates to the technical field of catalytic materials, in particular to a carbon-based monatomic catalyst doped with five non-metallic elements and a preparation method and application of the carbon-based monatomic catalyst doped with the five non-metallic elements. An organic precursor (MOF-coated POSFN-CTP) rich in five non-metallic element heteroatoms is prepared through a simple coprecipitation method at the room temperature; and annealing to obtain the carbon material (POSFNC) doped with five non-metallic elements. On the basis, the POSFNC is further impregnated with a transition metal precursor, annealing is carried out again, and the carbon-based monatomic catalyst doped with five non-metallic elements is successfully synthesized. The carbon-based monatomic catalyst with a hollow porous structure and five non-metallic element heteroatoms uniformly distributed can be constructed through the method, the synthesis process has the advantages of simplicity, convenience, economy and environmental protection, and the ORR activity and stability of the prepared catalyst exceed those of a commercial Pt / C catalyst.

The invention discloses an application of a single-metal Co (at) N-C nanotube with high C and N contents. The Co (at) N-C nanotube is used for a zinc or magnesium metal air battery positive electrode material catalyst. The application of the oxygen reduction catalyst in a primary zinc-air battery, a primary magnesium-air battery and a secondary zinc-air battery is realized. The oxygen reduction catalytic material is characterized by being a monometallic catalyst, and shows relatively high energy density and power density in a metal battery. The half-wave potential of the prepared single-metal catalyst Co (at) NC-1Co (at) NC-1 is 0.85 V, and the half-wave potential exceeds the half-wave potential of commercialized 20% Pt / C; the limit diffusion current density Jd is 5.44 mA cm <-2 >, which is equivalent to that of commercial 20% Pt / C. The power density of a primary zinc air battery taking Co-coated NC-1 as the oxygen reduction catalyst is 202 mW cm <-2 >, and the maximum energy density is 928 Wh kg <-1 > Zn, which is higher than that of a Pt / C-based zinc metal air battery. The catalyst has the advantages of easily available raw materials, simple preparation and low cost, and has potential commercial application value.

The invention provides a CoCe-SNC catalyst and a preparation method and application thereof, and belongs to the technical field of hydrogen fuel cell / metal air cell cathode catalysts. The preparation method comprises the following steps: mixing and grinding a metal organic framework ZIF-8 and KSCN, carrying out first pyrolysis, compounding the obtained nitrogen and sulfur-containing co-doped carbon with two metal complexes Co-PM and Ce-PM, and carrying out second pyrolysis to obtain the CoCe-SNC diatomic catalyst. According to the invention, the two-dimensional lamellar structure carbon material and the asymmetric coordination diatomic metal are compounded, so that the catalytic performance of the whole catalyst is improved, and meanwhile, the yield of hydrogen peroxide generated by side reaction is reduced. The catalyst is applied to a hydrogen fuel cell / metal air cell, and the defects that in the prior art, a noble metal catalyst is high in cost, and a non-noble metal catalyst is low in catalytic activity, high in hydrogen peroxide yield, poor in catalyst stability and the like are overcome.

The invention relates to the technical field of preparation of binuclear cobalt complexes, in particular to a binuclear cobalt complex as well as a preparation method and application thereof. The molecular formula of the binuclear cobalt complex is Co2 (L1) 2X2, the binuclear cobalt complex is composed of two L12-groups, two trivalent cobalt and two X-ions, and X is Cl or OH. The binuclear cobalt complex Co2 (L1) 2Cl2 belongs to a triclinic system, belongs to a P-1 space group, and is a chlorine-bridged binuclear cobalt complex. The binuclear cobalt complex Co2 (L1) 2 (OH) 2 belongs to a monoclinic system, belongs to a P21 / n space group, and is an oxyhydrogen bridging binuclear cobalt complex. The preparation method of the two binuclear cobalt complexes is simple, the cost is lower than that of precious metal, the stability and the selectivity are good, and the binuclear cobalt complexes have certain electrocatalytic oxygen reduction reaction performance.

The present invention relates to the technical field of ORR catalyst preparation, and in particular to an iron-nitrogen-carbon catalyst and its preparation method and application. The present invention provides a method for preparing an iron-nitrogen-carbon catalyst, characterized in that it comprises: dispersing a zinc salt and a ferrous salt in methanol to obtain a mixed solution A; under heating conditions, dispersing 2-methylimidazole and 1,4-terephthalonitrile in methanol to obtain a mixed solution B; stirring and mixing the mixed solution A and the mixed solution B to obtain a precursor powder, and calcining the precursor powder under an inert atmosphere to obtain an iron-nitrogen-carbon catalyst with a hierarchical porous structure. The present invention provides a new preparation method for preparing an iron-nitrogen-carbon catalyst with a hierarchical pore structure, which prepares the iron-nitrogen-carbon catalyst with a hierarchical pore structure by introducing a 1,4-terephthalonitrile molecular template.

The invention belongs to the technical field of chemical energy, and particularly relates to an ultralow-potential-difference zinc-air battery containing a copper cluster axial coordination iron monatomic catalyst. Benzimidazole and 2-methylimidazole are synthesized into ZIF-7-NH2, the ZIF-7-NH2 reacts with Fe (NO3) 3.9 H2O and Cu (OAc) 2. H2O in an ion exchange mode to obtain FeCu-ZIF-7-NH2, a urea calcination product g-C3N4 is added, stirring is carried out to obtain Fe-ZIF-7-NH2 / g-C3N4, finally, sintering is carried out under argon to obtain g-SAFe-Cin, the ORR activity and the OER activity of the catalyst are remarkably enhanced by constructing the copper cluster axial coordination iron monatomic catalyst, and the catalyst has the advantages of being high in catalytic activity, high in catalytic activity and high in catalytic activity. And the performance of the assembled zinc-air battery in the charge-discharge cycle is improved. Non-noble metal and a low-cost carbon source are used as raw materials, the synthesis cost of the catalyst is reduced, the yield is high, the preparation period is short, and large-scale commercial application potential is achieved.

The invention relates to the technical field of catalytic materials, in particular to a molybdenum sulfide-based electro-catalytic material and a preparation method and application thereof. The invention provides a molybdenum sulfide-based electro-catalytic material, which comprises a transition metal chalcogenide containing chalcogen element vacancies and titanium dioxide quantum dots containing oxygen vacancies compounded on the surface of the transition metal chalcogenide, and a composite interface of the transition metal chalcogenide and the titanium dioxide quantum dots has a heterojunction structure. According to the composite electrocatalytic hydrogen evolution catalyst containing the TiO2 quantum dots and coupled with the double vacancies and the preparation method of the composite electrocatalytic hydrogen evolution catalyst, through the quantum effect and the double vacancy defect effect of the TiO2 quantum dots, the conductivity and the active site density of transition metal chalcogenide catalysts are improved, and the electrocatalytic hydrogen evolution performance is synergistically enhanced.

The invention discloses a preparation method and application of a polyindium phthalocyanine oxygen reduction electrocatalyst covalently suspended on a carbon nano pit, polyindium phthalocyanine is anchored on a defective carbon nano tube etched by CO2, and collaborative optimization of InPc electronic structure regulation and metal-carrier electron interaction is realized. Nano-pit defects are generated on the surface of CNT through CO2-driven oxidation etching, rich edge type carbon atoms with unpaired electrons are exposed in the substrate surface of the CNT, meanwhile, a single-layer InPPc polymer is covalently suspended on the carbon nano-pit defects through axial In-C coordination, axial In-C coordination bonds serve as electron bridges, and therefore, the carbon nano-pit defects can be formed in the surface of the CNT through the axial In-C coordination bonds. And strong interface coupling between the In-N4 center and the v-CNT substrate is realized. According to the electrocatalyst prepared by the method, the ORR catalytic activity and stability of the catalyst are remarkably improved.

A bimetal active site doped carbon-based catalyst, which is particularly a ZnMn-N-C catalyst. The ZnMn-N-C catalyst is prepared by using 1H-1,2,3-triazole, manganous nitrate and zinc chloride as reaction raw materials, subjecting same to a solvothermal reaction and then to drying to obtain a Mn-MET-ZnCl2 powder, and then sequentially subjecting the powder to primary pyrolysis, a sulfuric acid treatment and secondary pyrolysis. By respectively using 1H-1,2,3-triazole and zinc chloride as a mesopore forming agent and a micropore forming agent, and adjusting the pore-forming sequence and controlling the pore-forming process by means of pyrolysis, a large number of mesopores are preferentially formed, and then a large number of micropores are uniformly distributed in the mesopores, thereby forming a hierarchical pore channel structure and overcoming the problem of the collapse of the pore channel structure during the formation of the structure; and the obtained bimetal site doped carbon-based catalyst ZnMn-N-C has a high specific surface area of 1837.9 m2 / g and exhibits a good ORR activity (E1 / 2=0.867 V vs. RHE), and a primary zinc-air battery assembled by using the catalyst ZnMn-N-C as a positive oxygen reduction catalyst has a high energy density of 889 Wh / kg-1 Zn.

The invention discloses an iron-nickel diatomic fiber catalyst with a precise and adjustable local structure and a preparation method and application thereof.The method is based on an organic small molecule coordination strategy and comprises the steps that ferric nitrate, nickel nitrate and dicyandiamide are dissolved in DMF according to a certain molar ratio, and a solution A is obtained; dispersing ZIF-8 nanoparticles in DMF (Dimethyl Formamide), and adding polyacrylonitrile to obtain a solution B; the solution A and the solution B are mixed to obtain a spinning solution, and a nanofiber membrane is obtained through electrostatic spinning; and carrying out pre-oxidation and high-temperature carbonization treatment on the nanofiber membrane to obtain the carbon nanofiber catalyst loaded with iron-nickel bimetallic atoms (metal diatoms, heterojunctions and alloys in which the metal diatoms and clusters coexist). The problem that the metal active site local structure of a metal diatom catalyst is difficult to accurately regulate and control is solved, and the prepared metal diatom heterojunction shows excellent ORR and OER bifunctional catalytic performance and cycling stability as a zinc-air battery positive electrode catalyst.

The invention discloses a non-noble metal ORR catalyst and a preparation method thereof, and belongs to the technical field of electro-catalysis. The method comprises the following steps: (1) adding 5, 10, 15, 20-tetra (4-cyanophenyl) porphyrin and nickel salt into an organic solvent, and synthesizing a supramolecular crystal precursor UPC-S7 through solvothermal reaction; (2) carbonizing the supramolecular crystal precursor UPC-S7 in an inert atmosphere to obtain a Ni-coated NC material; (3) oxidizing the Ni-coated NC material in an oxygen-containing atmosphere to obtain a Ni / NiO-coated NC material; and (4) sequentially soaking and etching the Ni / NiO-coated NC material by using a nitric acid solution and an ammonia water solution, and then washing and drying to obtain the non-noble metal ORR catalyst. The prepared catalyst does not contain precious metal such as platinum, the raw material cost is remarkably reduced on the basis of ensuring the ORR activity and stability of the catalyst, and a new scheme is provided for solving the cost bottleneck of a fuel cell.

The invention relates to the technical field of electrochemistry, in particular to a core-shell fiber catalyst layer, a preparation method and application thereof, a membrane electrode and a zinc-air flow battery. The catalyst layer comprises a core layer with polymer nanofibers and a metal-doped COP catalyst coated on the core layer; the catalyst layer has electrical conductivity. The core-shell fiber catalyst layer has the flexibility and pore structure of a nanofiber membrane, and the porous structure can accelerate substance transfer, so that active substances can be quickly diffused to active sites, and the reaction rate is further accelerated.

The invention discloses a method for synthesizing a platinum-based nitrogen-doped graphdiyne catalyst based on an atomic layer deposition technology and application of the platinum-based nitrogen-doped graphdiyne catalyst. Firstly, hexabromobenzene and calcium carbide are subjected to vacuum ball milling, calcination and purification to obtain a graphdiyne carrier, then the graphdiyne carrier and melamine are mixed and calcined to achieve nitrogen doping of the carrier, and then loading of platinum nanoparticles is accurately controlled through an atomic layer deposition technology. According to the method, the characteristics of an atomic layer deposition technology are utilized, deposition parameters and the number of cycles are controlled, uniform distribution and size control of Pt nano-particles on porous graphdiyne are achieved, and a nitrogen-doped graphdiyne carrier and the platinum nano-particles have a synergistic effect. The platinum-based nitrogen-doped graphdiyne catalyst prepared by the invention has the specific surface area of 734.8 m < 2 > g < 1 > and the average pore size of 8.68 nm, and shows excellent electrocatalytic activity and dynamic performance in reaction.

One embodiment is an aircraft having a least one of an aircraft motor or an aircraft motor drive, and a metal-air fuel cell. The aircraft has a waste heat transfer system including a diverter system. The diverter system selectively couples the metal-air fuel cell and the at least one of the aircraft motor or the aircraft motor drive. The aircraft has a control system to operate the waste heat transfer system to selectively transfer waste heat from the at least one of the aircraft motor or the aircraft motor drive to the metal-air fuel cell. The control system determines a power output status of the metal-air fuel cell, and to operate the diverter system to transfer the waste heat from the at least one of the aircraft motor or the aircraft motor drive to the metal-air fuel cell in response to determining the power output status.

The invention discloses a slurry hydrogen storage fuel cell system, which comprises: a hydrogen storage slurry circulation module for storing and circulating a slurry hydrogen storage material; the slurry hydrogen storage material comprises organic liquid and metal hydride; the fuel cell adopts a liquid metal anode; the fuel cell comprises an anode inlet and an anode outlet; a separator for separating the anode discharge; the metal hydride powder feeder is used for supplementing metal hydride powder to the hydrogen storage slurry circulating module; wherein the slurry hydrogen storage material reacts on a liquid metal anode interface to generate electric energy and form organic liquid vapor; and the organic liquid vapor is discharged into the separator from the anode outlet, is separated, is conveyed into the hydrogen storage slurry circulating module, and is mixed with the metal hydride powder from the metal hydride powder feeder to form a slurry hydrogen storage material. According to the invention, direct power generation of the slurry hydrogen storage material on the fuel cell anode interface is realized, and the power density of the system is greatly improved.

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 discloses a preparation method and application of an MOF (Metal Organic Framework) derived carbon catalyst for regulating and controlling oxygen reduction catalytic performance based on surface strain. The method comprises the following steps: firstly, constructing a cubic MOF core under the assistance of a cationic surface active agent template through coordination self-assembly of a cobalt ion node and an imidazole ligand; then, an MOF heterogeneous core-shell layer is constructed on the surface of the core through a zinc ion mediated epitaxial growth technology, and a double-layer cubic MOF precursor with a clear core-shell interface is formed. Through carbonization treatment at different temperatures, the core MOF generates controllable surface strain in the carbonization process, metal active site coordination and electronic structures can be adjusted, and the adsorption strength of sites to oxygen reduction intermediates is optimized. A rigid porous carbon frame formed after carbonization of an epitaxial MOF heterogeneous core-shell layer constructs a three-dimensional through mass transfer network through micro-mesoporous synergy, meanwhile, the rigid porous carbon frame and the strained core form a nanoscale space isolation area, and thermal migration of metal active sites and Ostwald curing are effectively inhibited by means of the geometric confinement effect. The activity and the stability of the catalyst are remarkably improved based on multiple synergistic effects caused by evolution of an intrinsic micro-nano structure induced by surface strain. The MOF derived carbon catalyst for regulating and controlling the oxygen reduction catalytic performance based on the surface strain, provided by the invention, is simple in preparation process and low in cost, and shows excellent performance and wide application prospect in a zinc-air battery.

The invention discloses a preparation method and application of a metal modified amino porphyrin COF material based on ferrocene dicarboxaldehyde, and the preparation method comprises the following steps: (1) adding ferrocene dicarboxaldehyde and 5, 10, 15, 20-tetra (4-aminophenyl) porphyrin into an organic solution, and carrying out ultrasonic mixing; (2) adding a catalyst into the dispersion liquid, ultrasonically mixing uniformly, and carrying out multiple freezing degassing circulation treatment; (3) after the treatment in the step (2), carrying out heat preservation reaction, cooling to room temperature, carrying out centrifugal separation on turbid liquid, washing the precipitate, then soaking the precipitate by using an organic solvent, and centrifugally collecting a precipitate product; and (4) drying the precipitation product, and collecting to obtain a black powder sample COF material. The COF material prepared by the invention has excellent electro-catalytic performance and stability, and has a good application prospect in metal-air batteries.

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 application discloses a chlorine-free compound electrolyte for improving magnesium battery performance and a preparation method thereof, and belongs to the technical field of magnesium air battery electrolytes.The chlorine-free compound electrolyte for improving magnesium battery performance is a mixed solution of sodium sulfate, sodium carbonate, 2-methyl imidazole and deionized water.The application first uses sodium sulfate to replace sodium chloride to avoid chlorine ions from accelerating magnesium corrosion;sodium carbonate reacts with a magnesium matrix to form a uniform thin magnesium carbonate layer;and 2-methyl imidazole uses a large Pi bond structure and nitrogen atoms to adsorb positive charge magnesium surfaces to form a dense film layer.The synergistic effect of the three materials can inhibit loose and porous discharge products from being deposited on the anode surface, greatly improve anode utilization efficiency to 87%, and improve the discharge voltage to -1.9 V.The application adjusts the ratio of a solvent to a solute to maximize the improvement of the discharge performance of the air battery;the prepared battery has the advantages of green environmental protection, convenient operation, simple preparation process and the like, and can realize the potential of remote electronic equipment application.

The invention belongs to the technical field of new energy materials, and discloses preparation and application of a cobalt and iron bimetal-based sulfide self-supporting cathode catalytic material for a zinc-air battery. The invention provides a self-supporting catalytic material FeS / CoS1.097 atN / CC which is successfully prepared by taking bimetallic-hydroxide as a precursor, loading ZIF-67 particles at room temperature and finally carrying out vulcanization and carbonization through a one-step vapor deposition method. The preparation method is simple and efficient, multiple active sites of the metal hydroxide and high specific surface area of an MOFs material are combined, and the self-supporting catalytic material is prepared. Meanwhile, a nitrogen-doped carbon-coated structure is constructed, the design of a heterostructure is meticulously regulated and optimized, and active sites are increased. Therefore, the catalyst FeS / CoS1.097-coated NC / CC has relatively high practical significance and application value in the aspects of realizing bifunctional catalytic activity and good cycling stability.

A method for producing soda ash from flue gases involves capturing and processing the gases to remove contaminants and produce a high-purity soda ash. The process involves passing flue gas through a carbon capture system, where nitrates and sulfates are removed from the gas. The gas is then scrubbed with a rich caustic, causing a chemical reaction that removes carbon dioxide. The resulting product is then separated into a purified Na2CO3 product, essentially pure soda ash.

Electrochemical devices including electrochemically-driven carbon dioxide separators are disclosed, the devices including electrodes comprised of an anion exchange polymer and a charge storage compound such as nickel hydroxide and a membrane comprising an anion exchange polymer, the membrane having a channel for inflow of a carbon dioxide-containing gas within the membrane.

The application provides a pr-modified recycled aluminum alkaline air battery anode material and a preparation method thereof, and belongs to the technical field of aluminum alloy materials.The anode material is composed of the following components in percentage by weight: 0.1-2.0% of Zn, 0.01-0.2% of Ga, 0.01-0.3% of Pr, 0.2-2% of Mn, 0.9-2.0% of Fe, and 0.5-2.0% of Si; the balance is Al; the Si and Fe are from recycled aluminum.The application directly uses high-iron recycled aluminum to prepare the pr-Ga-Mn-Si-Zn five-element alloy by reducing the raw material cost by more than 80%; the application avoids the resource waste of the traditional dilution method, realizes the high-value utilization of recycled aluminum, and forms a closed loop of "waste aluminum-anode-corrosion product-aluminum source", thereby avoiding the aluminum circulation imbalance and the secondary aluminum surplus problem caused by the accumulation of alloy elements.

The invention discloses an asymmetric carbon-based air electrode with wettability gradient as well as a preparation method and application of the asymmetric carbon-based air electrode. The preparation method comprises the following steps: respectively carrying out ultrasonic dispersion on functionalized fish scale-like hydrophilic graphene nanosheets and functionalized water strider fluff-like hydrophobic multi-walled carbon nanotubes to obtain carbonaceous assembly solutions of carbon-based materials with different structural characteristics; and carrying out carbonaceous assembly under negative pressure by adopting a vacuum suction filtration method, and ensuring that the suction filtration interval of two kinds of carbonaceous assembly liquid does not exceed 1min, so as to obtain the asymmetric air electrode with wettability gradient. The asymmetric air electrode assembled by the Axy-FCNTs-FGNSs through carbonaceous materials has an oxygen transmission channel, an expanded three-dimensional interface enables a positive electrode reaction to have higher active site utilization rate and better structural durability, the peak power density of a zinc-air battery assembled as a positive electrode is up to 239.3 mW cm <-2 >, the specific capacity of the battery is 814.3 mAh gZn <-1 >, and under the circulating current density of 10 mAcm <-2 >, the specific capacity of the zinc-air battery can be greatly improved. Under the condition that the voltage difference is 0.84 V, the excellent cycle life of 3696 times is shown, and good application prospects are achieved.

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.