697 results about "Oxygen reduction" patented technology

The invention discloses a MoS2-coated porous M-N-C monatomic catalyst and an application thereof in a lithium air battery, the MoS2-coated porous M-N-C monatomic catalyst is prepared by the following steps: chelating transition metal ions through a chelating agent, anchoring the transition metal ions on a porous carbon carrier, mixing the transition metal ions with a nitrogen source precursor, and calcining to obtain a material which takes porous nitrogen-doped carbon as a carrier and loads a transition metal monatomic M, thereby obtaining the MoS2-coated porous M-N-C monatomic catalyst. And wrapping the layered MoS2 nanosheets through a hydrothermal vulcanization method and high-temperature calcination to obtain the target catalyst material. The obtained composite material has higher mass transfer efficiency, has higher oxygen reduction activity and stability in acidic and alkaline media, has lower overvoltage, high specific discharge capacity and excellent cycle performance when being used as a lithium air battery catalyst, and has better research prospects.

The invention discloses a self-driven bio-electro-Fenton sewage treatment method based on granular sludge electroactivity domestication. The sewage treatment method comprises the following steps: firstly, inoculating anaerobic granular sludge into an anode chamber of a microbial fuel cell, fixing a clustered carbon fiber electrode in a biological anode chamber as an electrode collector, taking a cathode as an oxygen reduction cathode, and performing electrochemical enrichment to obtain electroactive granular sludge; then, preparing an iron-cobalt diatomic catalyst from the nitrogen-doped graphene oxide, cobalt phthalocyanine and iron phthalocyanine; and finally, adding the iron-cobalt diatomic catalyst into the electroactive granular sludge to form a hybrid structure, controlling dissolved oxygen in a reaction system, and degrading organic pollutants by adopting an SBR (sequencing batch reactor). The biological electro-Fenton technology has a better effect of removing refractory organic pollutants, and compared with a traditional electro-Fenton method, the self-Fenton technology can achieve the activity of molecular oxygen without external electric energy input.

The invention provides a platinum-carbon catalyst taking hollow carbon nanospheres as a carrier and a preparation method of the platinum-carbon catalyst. The method comprises the following steps: adding a polymer monomer into a nano template dispersion liquid with a uniform size; then adding a proper amount of platinum salt into the solution to obtain a mixed solution, and stirring to react for 0.5-30 hours to obtain a reaction product; and annealing the reaction product, and then removing the nano template to obtain the platinum-carbon catalyst. The obtained platinum-carbon catalyst takes the hollow carbon nanospheres as a carrier and has a larger specific surface area, the platinum catalyst is loaded on the surfaces of the carbon nanospheres and can be in better contact with an electrolyte, and the obtained catalyst has good electrochemical activity and shows excellent electro-catalytic hydrogen evolution performance and oxygen reduction performance; and the related preparation method is simple and reliable, is suitable for preparation of an electrocatalytic hydrogen evolution electrode and an oxygen reduction electrode, and has a good application prospect in the fields of proton exchange membrane electrolytic cells, hydrogen fuel cells and the like.

The invention discloses an electrocatalyst material for in-situ production of hydrogen peroxide through oxygen reduction as well as a preparation method and application of the electrocatalyst material, and belongs to the field of organic wastewater treatment. MoS2 / Fe porous conductive particles and a high-molecular polymer are adopted as main components, and ethanedioate and polyacrylamide are combined as a dispersion auxiliary solvent and a pore-forming agent to form a three-dimensional composite conductive catalyst material; through ultralow-temperature freeze drying and microwave radiation technologies, the material structure is optimized, the catalytic reaction active sites are improved, and efficient electrocatalytic oxygen reduction for in-situ production of hydrogen peroxide is realized; the MoS2 / Fe porous conductive particles not only optimize the performance of the catalyst, but also realize high-valued utilization of solid wastes; the electrocatalyst material has excellent conductivity, catalytic activity and organic wastewater degradation capability, is stable in removal effect before and after use, can be repeatedly used for multiple times, reduces the use cost, and provides a wide application prospect for the fields of environmental protection, energy and the like.

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 a non-noble metal fuel cell oxygen reduction catalyst based on a self-assembled semi-interpenetrating polymer network and a preparation method and application thereof, and belongs to the technical field of fuel cell oxygen reduction catalysts. The preparation method of the catalyst comprises the following steps: S1, dissolving polysaccharide in ultrapure water, heating and stirring, then adding a polymer monomer, a polymerization initiator, a salt template and a non-noble metal source solution, heating and stirring until uniform orange red hydrogel is obtained, then adding a nitrogen source, continuously heating and stirring, and evaporating a solvent to dryness, so as to obtain a polysaccharide solution; freezing and drying to obtain an orange powder sample; s2, performing pyrolysis treatment on the orange powder sample to obtain a black powder sample, and performing acid pickling, suction filtration and drying to obtain a precursor product; s3, pyrolyzing the precursor product again to obtain the catalyst. The semi-interpenetrating polymer network hydrogel is synthesized in a self-assembly mode, and the catalyst with high loading capacity and atomic-scale dispersion is formed through pyrolysis.

The invention discloses a method for synthesizing hydrogen peroxide through high-efficiency electro-catalysis oxygen reduction, which comprises the following steps: in an electro-catalysis system, ZnS is loaded on an atomic catalyst Co-NC to form a heterogeneous interface ZnS / Co-NC as an electro-catalyst for synthesizing hydrogen peroxide through oxygen reduction, and ZnS / Co-NC regulates and controls the 3d orbital electron spin state of an active site of monatomic Co-NC to synthesize hydrogen peroxide. Therefore, an oxygen reduction path is converted from a four-electron reduction path to two-electron oxygen reduction to produce hydrogen peroxide; wherein ZnS redistributes charges on a monatomic C carrier and adjusts the spin state of Co < 2 + >, so that the activity of an oxygen reduction process is ensured, a two-electron reaction process is ensured to be a leading process in a reaction process, and high-selectivity and high-activity conversion of oxygen into an ideal H2O2 product can be effectively promoted.

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 present invention generally relates to a process for synthesizing a graphene oxide quantum dots-iron phthalocyanine (FePc-GOQDs) nanocomposite with enhanced electrochemical properties, particularly for oxygen reduction reactions (ORR). The process begins by dispersing 500 mg of graphene oxide (GO) in a hydrogen peroxide and deionized water solution in a 1:10 volume ratio, followed by hydrothermal treatment at 180° C. for 8 hours to produce GO quantum dots (GOQDs). The resulting material is freeze-dried to obtain GOQDs powder. Subsequently, 60 mg of GOQDs are combined with 10 mg of iron phthalocyanine (FePc) and 20 mL of dimethyl sulfoxide (DMSO), and the mixture is subjected to microwave irradiation at 500 W and 150° C. for 30 minutes. The resulting composite is rinsed repeatedly with deionized water and ethanol, then dried at 120° C. to yield the FePc-GOQDs nanocomposite. This composite demonstrates superior ORR performance due to strong Fe—O bonding and optimized electronic interactions.

The invention relates to the technical field of inorganic non-metallic materials, in particular to an onion carbon preparation method based on a metal organic framework and onion carbon. The preparation method comprises the following steps: S1, synthesizing a metal organic framework precursor; s2, preliminary pyrolysis of the metal organic framework precursor; s3, etching and decomposing the formed metal particles; and S4, carrying out secondary pyrolysis on the primary pyrolytic carbon material. The carbon diameter of the prepared onion is 5-20 nm, and the carbon layer spacing is 0.34 nm. According to the preparation method, a metal organic framework is taken as a precursor, a two-step pyrolysis method is adopted, the precursor is carbonized at high temperature, a carbon material is etched again by ammonia gas and other gases released by thermal decomposition of melamine, and under the action, graphene is rearranged in the form of the same sphere center layer to form onion carbon particles with uniform sizes. The temperature and the reaction time in the preparation process can be accurately controlled, the preparation process is simple, the cost is low, the prepared onion carbon has relatively high purity and uniformity, and the oxygen reduction catalytic activity can be improved.

The application discloses a platinum-based high-entropy intermetallic compound and a preparation method and application thereof as a hydrogen fuel cell cathode catalyst, and belongs to the field of fuel cells.The preparation method comprises the following steps: S01, adding platinum salt, at least five other metal salts and a nitrogen-rich organic compound into an organic solvent, uniformly mixing, and obtaining a metal precursor mixed solution; S02, adding a carbon carrier into the metal precursor mixed solution, fully mixing, drying, collecting, and obtaining a precursor; and S03, heat treating the dried precursor under a reducing atmosphere, and performing heat preservation treatment, so as to obtain the platinum-based high-entropy intermetallic compound.The preparation method is simple, low in cost and good in repeatability, the prepared catalyst has the advantages of uniform particle size and high oxygen reduction activity, and has a good development prospect in the field of hydrogen fuel cell catalyst applications.

The invention provides a Fenton technology coupled microbial fuel cell, a preparation method and application, and relates to the field of environment, materials and energy, the specific technical scheme is as follows: the Fenton technology coupled microbial fuel cell comprises an anode, a cathode and a catholyte, and is characterized in that the anode is a biological anode, the cathode is an air cathode, and the air cathode is an air cathode; the air cathode comprises an oxygen reduction electrocatalyst and a cathode substrate I, the oxygen reduction electrocatalyst is attached to the cathode substrate I, and the catholyte is common industrial and domestic wastewater. The electro-Fenton technology is introduced into the air cathode of the microbial fuel cell, the cathode fully utilizes electrons generated by metabolism of a biological anode to carry out an oxygen reduction process in the presence of air, so that hydrogen peroxide is generated in situ and is activated into active species such as hydroxyl free radicals through a Fenton catalyst, and the hydrogen peroxide is converted into hydrogen peroxide. Therefore, the purpose of degrading complex pollutants with low energy consumption is achieved.

The invention relates to a carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction, a catalyst, a preparation method and application thereof, and the scheme is innovated by the following steps: dipping conductive carbon black (such as ketjen black ECP600JD) and 60-70wt% phosphoric acid solution according to a solid-to-liquid ratio of 1g / (15-18) mL, preheating at 100-250 DEG C in an argon atmosphere, then carrying out a reaction for 10-100 seconds under the assistance of a microwave power of 100-600 W, and carrying out vacuum drying to obtain the carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction. The phosphorus content of the prepared carbon carrier material is 4-6wt%, and the graphitization degree of the carbon carrier material is improved (ID / IG value is 1.15-1.20). And after the platinum-cobalt alloy is further loaded, the particle size of the nanoparticles is uniform, the potential loss is only 3 mV after 5000 accelerated attenuation tests in the proton exchange membrane fuel cell, and the power density attenuation is reduced by 58%. The method has the advantages of quick reaction, low energy consumption, high corrosion resistance and the like, and the stability of the catalyst is remarkably improved.

The invention discloses a preparation method of niobium-tungsten alloy spherical powder and a 3D printing method of the niobium-tungsten alloy spherical powder, and belongs to the technical field of refractory metal material preparation.The preparation method comprises the steps that niobium, tungsten, molybdenum and zirconium refractory metal raw materials are smelted to obtain cast ingots with uniform components, and hydride powder is formed after hydrotreating and mechanical crushing; spherical powder is prepared by adopting a plasma spheroidizing technology, then dehydrogenation is performed for 1-3 hours at the temperature of 450-750 DEG C, magnesium powder is added, treatment is performed for 2-5 hours in an inert atmosphere at the temperature of 800-1100 DEG C, and finally the low-oxygen niobium-tungsten alloy spherical powder with the oxygen content lower than 120 ppm is obtained. Compared with a traditional process, the spheroidizing treatment is innovatively carried out before the dehydrogenation and oxygen reduction process, the deoxidation efficiency is improved through the relatively small specific surface area of spherical powder, and oxygen content control is achieved in combination with magnesium powder heat treatment. The problems of high oxygen content and low powder yield in a traditional process are solved, and material support is provided for high-performance niobium-tungsten alloy components in the fields of aerospace, nuclear power and the like.

The invention provides synthesis and oxygen reduction application of a metal cluster / polyphthalocyanine network compounded organic electrocatalytic material. The preparation method comprises the following steps: by taking benzene ring-containing anhydride, chlorate and urea as raw materials, carrying out high-temperature reaction, cooling, and purifying for multiple times, so as to obtain an edge-functionalized polyphthalocyanine network precursor; dispersing the obtained polyphthalocyanine network precursor into a solution A by using a proper solvent; meanwhile, trifluoroacetate and a tert-butyl metal compound are mixed in a proper solvent to form a metal cluster, and the metal cluster compound is dissolved in the solvent to form a solution B; and mixing the two solutions, standing overnight, filtering, purifying, and carrying out ball milling treatment to finally obtain the target metal cluster / polyphthalocyanine network composite organic catalyst. The polyphthalocyanine oxygen reduction organic catalytic material designed by the invention is low in raw material cost and simple to prepare. The test shows that the half-wave potential of the material is 100 mV higher than that of Pt / C, the E1 / 2 reduction value is 30 mV lower than that of Pt / C after accelerated aging for 2500 circles, and the material has high activity and high stability and can be applied to devices such as lithium batteries and fuel batteries related to the oxygen reduction process.

The invention discloses a preparation method of a tellurium-doped metal-nitrogen carbon catalyst and application of the tellurium-doped metal-nitrogen carbon catalyst in a zinc-air battery, a metal organic framework precursor is synthesized by utilizing a nitrogen-containing heterocyclic ring ligand and transition metal, and the metal organic framework precursor is mixed with tellurium dioxide and then subjected to high-temperature calcination in an inert atmosphere to obtain the tellurium uniformly dispersed and doped metal-nitrogen carbon catalyst. The prepared tellurium-doped metal-nitrogen carbon catalyst fully utilizes the characteristics of moderate tellurium coordination capability and rich p electrons, further exerts the advantages of a metal-nitrogen carbon monatomic catalyst, avoids the use of a noble metal catalyst which is scarce in resource and relatively high in cost, and is suitable for industrial production. Wide application prospects are realized in the fields of electro-catalytic oxygen reduction, zinc-air batteries and the like.

The invention belongs to the technical field of steel smelting, and particularly relates to a rare earth steel smelting method based on a thin slab continuous casting and rolling production line. Comprising the following steps: (1) dynamic dephosphorization control: controlling the temperature of molten steel to be 1380-1410 DEG C, the content of FeO in slag to be 15-20%, the alkalinity of the slag to be 1.8-2.2 and the content of phosphorus at the end point to be less than or equal to 0.015% in a window period 0-6 minutes before converter smelting; and (2) converter end point carbon and oxygen regulation: the converter end point carbon content is greater than or equal to 0.08%, the end point oxygen content is less than or equal to 300ppm, and the end point inclusion density is less than or equal to 10 inclusions / mm < 2 >. Through a process chain of dynamic dephosphorization and oxygen reduction, gradient deoxidation and purification, step-by-step slag system optimization, rare earth sequential addition and whole-course protection casting, a forward circulation of molten steel cleanliness and rare earth stability is formed, the rare earth steel continuous casting problem is fundamentally solved, and technical innovation and economic breakthrough are achieved at the same time.

The invention discloses a two-dimensional Pd nanosheet electrocatalyst rich in grain boundary and a preparation method of the two-dimensional Pd nanosheet electrocatalyst, and belongs to the technical field of electrochemical catalysis. The method comprises the following steps: by taking palladium acetylacetonate as a precursor, ascorbic acid and carbon monoxide as reducing agents and oleylamine as a solvent, carrying out heating reaction in a high-temperature reaction kettle; after the reaction is completed, the obtained mixture is cleaned and dried, and finally the ultrathin two-dimensional Pd nanosheet rich in the grain boundary is prepared. According to the preparation method, the active sites of the basal plane can be greatly increased, the electronic structure of the catalyst can be optimized, the catalytic performance and the quality activity can be effectively improved, and the synthesized two-dimensional Pd nanosheet rich in the grain boundary can be used for a fuel cell, a metal-air battery and an efficient electrocatalyst in the electrochemical oxygen reduction process.

The invention provides molybdenum sulfide powder, a heavy metal adsorbent, a photo-thermal conversion material, a distillation method, an oxygen reduction catalyst and catalyst ink. This molybdenum sulfide powder contains a 3R crystal structure of molybdenum disulfide. The heavy metal adsorbent according to the present invention contains molybdenum sulfide particles having a median diameter (D50) of 10-1000 nm as determined by a dynamic light scattering type particle size distribution measurement device. This photo-thermal conversion material contains a material containing molybdenum sulfide particles, and generates heat by absorbing light energy.

The invention discloses a residual oil derived carbon supported Pt-Co-Au intermetallic compound as well as a preparation method and application thereof. According to the preparation method, residual oil is used as a carbon source, nitrogen-doped petroleum vacuum residual oil porous carbon is synthesized through a template method and nitrogen doping modification, and the high-dispersion intermetallic compound composite material Pt-Co-Au / NPPC is prepared with the porous carbon material as a carrier through an impregnation reduction method. In the catalyst, the total metal loading capacity is 30 to 50 percent by weight, the Pt loading capacity is 26 to 41 percent by weight, the Co loading capacity is 3.8 to 7 percent by weight, and the Au loading capacity is 0.2 to 2 percent by weight. The residual oil derived carbon supported Pt-Co-Au composite material nano catalyst prepared by the invention has efficient oxygen reduction (ORR) catalytic activity, and the synthesized catalyst has the characteristic of small size. The small size can effectively improve the utilization rate of Pt atoms, and the doping of Au can optimize the electronic structure of surface Pt, so that the ORR activity is improved. The fuel cell membrane electrode test peak power density of the prepared catalyst under the hydrogen-air condition reaches 1.12 W / cm < 2 >, the synthesis steps are simple, and the catalyst has good application prospects.

The invention discloses application of a carbon nitride photocatalyst based on multiple asymmetric active sites in hydrogen peroxide production. A sulfur-doped carbon nitride nanotube is synthesized through a thermal polymerization method, and then the photocatalytic material S-CNT-Zn with zinc monatomic loaded on the sulfur-doped carbon nitride nanotube is synthesized through an impregnation-calcination method. The preparation process is simple, and the preparation flow is simple. The carbon nitride photocatalyst with multiple asymmetric active sites can break the symmetry of a carbon nitride material, form gradient charge distribution, realize multi-path charge transfer and promote migration and separation of carriers. And the zinc monatomic as an oxygen adsorption site can promote the adsorption of oxygen and reduce the formation energy barrier of the intermediate. When visible light drives oxygen reduction to synthesize hydrogen peroxide, the carbon nitride photocatalyst with multiple asymmetric active sites keeps the stability of the catalyst and higher hydrogen peroxide yield, so that clean, stable and efficient photocatalytic reduction of oxygen to synthesize hydrogen peroxide is realized.

The invention provides a monatomic cobalt-doped graphite phase carbon nitride modified carbon electrode and a preparation method and application thereof, and belongs to the technical field. The prepared monatomic cobalt-doped graphite phase carbon nitride modified carbon electrode comprises a carbon electrode substrate and a cobalt-doped graphite phase carbon nitride catalytic layer. The oxygen-containing functional group of the carbon electrode and monatomic cobalt synergistically regulate and control the selectivity and activity of two-electron oxygen reduction, so that hydrogen peroxide is efficiently and stably generated by electro-catalyzing oxygen. The carbon electrode is applied to an electro-catalytic ozonation technology, H2O2 generated in situ reacts with ozone to generate hydroxyl radicals (OH), and monatomic cobalt and carbon nitride can also directly act on the ozone to generate OH, so that removal of new pollutants difficult to degrade is remarkably enhanced, and a theoretical basis and a technical support can be provided for remediation of the pollutants.

The invention discloses a Co / Mxene composite catalyst for oxygen reduction catalysis as well as a preparation method and application of the Co / Mxene composite catalyst. Belongs to the technical field of metal-air cell and fuel cell catalysts, clusters containing cobalt salt and ligands are easily adsorbed by Mxene nanosheets by utilizing amphipathicity and complexing action on cobalt ions of organic small molecule ligands, and under the inhibition of Mxene surface functional groups, the cobalt ions in the Mxene nanosheets are adsorbed by the Mxene nanosheets, so that the cobalt ions in the Mxene nanosheets are adsorbed by the Mxene nanosheets. The small particles cannot be further agglomerated in the calcining process of the inert atmosphere, so that the cobalt nanoparticles can be synthesized on the high-conductivity Mxene nanosheet substrate. The catalyst has efficient and stable oxygen reduction performance on the premise of maintaining high conductivity of Mxene; the cobalt content is low, and low-cost preparation can be achieved; the specific surface area is relatively large, and cobalt nanoparticles are uniformly distributed on the surface of Mxene; the catalyst has excellent conductivity, can be applied to membrane electrodes of zinc-air cells, aluminum-air cells and fuel cells, and provides an efficient and stable catalyst.

The embodiment of the application relates to an oxygen reduction catalyst for constructing a local alkaline-like microenvironment and a preparation method and application thereof, and belongs to the technical field of material synthesis. The preparation method of the oxygen reduction catalyst for constructing a local alkaline-like microenvironment comprises the following steps: (1) loading Fe on a core MOF material to obtain a core Fe / MOF material, and then constructing metal atoms M with water activation capacity in-situ on a shell MOF material by an epitaxial growth method to obtain a core-shell Fe / MOF@M / MOF precursor material, and Fe and M are limited in the core and the shell respectively; (2) performing in-situ carbon conversion on the Fe / MOF@M / MOF precursor material by pyrolysis to obtain a FeNC@MNC oxygen reduction catalyst for constructing a local alkaline-like microenvironment in natural seawater. The catalyst with water activation capacity provided in the embodiment overcomes the challenges of low ion conductivity and chloride adsorption in natural seawater, enhances the stability and activity of the catalyst in seawater, and realizes efficient and stable oxygen reduction.

The invention relates to a single crystal furnace and a crystal pulling process. The single crystal furnace comprises a furnace body, a crucible and a guide cylinder, the furnace body defines a furnace cavity with an opening in the top end, the opening is used for introducing protective gas into the furnace cavity, the crucible is arranged in the furnace cavity and used for containing silicon liquid, and the guide cylinder is arranged in the furnace cavity and located on the side, in the axis direction of the furnace cavity, of the crucible. The guide cylinder is provided with a channel which is arranged in a penetrating mode in the axis direction of the furnace chamber, protective gas flows towards the crucible through the channel, the inner side wall of the channel is provided with a plurality of guide grooves, the guide grooves are distributed in the circumferential direction of the furnace chamber at intervals and are spirally distributed, and the extending direction of the guide grooves intersects with the axis direction of the furnace chamber. According to the single crystal furnace, the airflow path of the protective gas can be optimized, the airflow of the protective gas generates vortexes, so that the temperature of the liquid level of the silicon liquid is more uniform, the oxygen reduction effect is better, and the impurity removal effect is better.

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 new energy materials, and particularly relates to a preparation method of a biomass-based iron-nitrogen-doped carbon catalyst with a full pH range and application of the biomass-based iron-nitrogen-doped carbon catalyst in the field of zinc-air batteries. According to the preparation method, bacterial cellulose, zinc nitrate, ferric chloride and dimethylimidazole are taken as precursors, a clean, efficient and stable soft template method is selected, and Zn < 2 + > gasification and evaporation etching in a pyrolysis process are utilized, so that the derived carbon catalyst generates a large number of defects and a large number of micropores and mesopores, and overgrowth of iron nanoparticles is limited; and the oxygen reduction catalyst with high specific surface area and high catalytic activity and stability in a whole pH range is prepared through drying and high-temperature carbonization process optimization, so that an electrode active material with excellent electrochemical performance is provided.

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.

The invention relates to an electrochemical generation device and a method for preparing hydrogen peroxide, the electrochemical generation device comprises an electrolysis module, and the electrolysis module comprises an electrolytic tank, an anode and an amphiphilic cathode; the amphiphilic cathode comprises a carbon felt substrate and active components loaded on the carbon felt substrate, and the active components comprise oxidized carbon black and polytetrafluoroethylene. According to the electrochemical generation device, under the condition that gas compression equipment is not additionally arranged, the interface mass transfer and three-phase interface catalytic performance of the amphiphilic cathode in the electrocatalytic oxygen reduction process is effectively improved, the electrode catalytic efficiency is improved, meanwhile, electrode surface denaturation and inactivation are reduced, and the yield of hydrogen peroxide is effectively improved.

The invention relates to a nitrogen-tellurium co-doped carbon-loaded cobalt-lanthanum-gallium triatomic oxygen reduction catalyst as well as a preparation method and application thereof. The catalyst comprises a carbon carrier, doped nitrogen atoms, doped tellurium atoms, supported cobalt atoms, supported lanthanum atoms and supported gallium atoms, wherein the doping proportions of nitrogen atoms and tellurium atoms in the carrier are 3.63 wt%-6.96 wt% and 2.11 wt%-3.83 wt% respectively, the loading capacity of cobalt atoms is 0.86 wt%-1.05 wt%, the loading capacity of lanthanum atoms is 0.38 wt%-0.47 wt%, and the loading capacity of gallium atoms is 0.21 wt%-0.47 wt%; in the preparation method, the nitrogen-tellurium co-doped carbon carrier is fully anchored and coordinated to Co and La atoms through a hydrothermal reaction; and through freeze drying, collapse of a carbon skeleton of the catalyst can be effectively avoided. The obtained catalyst shows good oxygen reduction activity in a solid zinc-air battery, and the peak power density of the catalyst reaches up to 1.68 mW cm <-2 >.