93 results about "Cathodic catalyst" patented technology

Provided is a laminate capable of electrolyzing an oxygen compound gas represented by CO2 with high conversion efficiency and suppressing deterioration in electrolytic performance. In this laminate having a structure in which an electrolyte layer is sandwiched between an anode catalyst layer and a cathode catalyst layer, a perovskite oxide and CuFe2O4 are contained in the cathode catalyst layer, and the content of CuFe2O4 in the cathode catalyst layer is at least 10 mass%.

The invention discloses a method for preparing a multi-carbon product through acid electrocatalysis carbon dioxide reduction and belongs to the field of chemistry and chemical engineering. An electro-catalysis carbon dioxide reduction system takes a Cu-based catalyst modified by HEDP as an electrode material, and K < + > in an electrolyte can be effectively enriched on the surface of the Cu-based catalyst due to the complexing effect of HEDP on K < + >, so that the local pH is increased, C-C coupling is promoted, and efficient conversion of CO2 to a multi-carbon product under an acidic condition is realized. According to the invention, HEDP molecules with a K < + > complexing function are introduced into the surface of a Cu-based catalyst for the first time, and the Cu-based catalyst is applied to an acidic electrocatalytic carbon dioxide reduction system with low K < + > concentration. The preparation method of the electrocatalytic system cathode catalyst is simple, mild in reaction condition and simple to operate, can effectively relieve the problem of carbonate deposition in an alkaline electrocatalytic system, and has industrial application prospects.

The present invention relates to a membrane electrode for reducing the hydrogen content in oxygen of a PEM water electrolyzer and a preparation method thereof, by simply adding an organic silicone resin solution in the cathode catalyst slurry preparation process, changing the mass transfer and transfer from the catalyst layer to the porous transmission layer after hydrogen is generated in the test process, reducing the hydrogen flux of hydrogen permeating from the cathode to the anode, and thus reducing the hydrogen content in oxygen. The present invention has the advantages of low preparation cost, simple process and easy operation, and excellent performance.

A composite separator and a preparation method therefor. The composite separator comprises a main film and an anti-contamination layer, which is arranged on one or both surfaces of the main film, wherein the anti-contamination layer comprises a first polymer, a charge agent and / or an anti-fouling agent. The composite separator can be applied to alkaline water electrolysis for hydrogen production and other electrolysis industries, and the anti-contamination layer of the composite separator can effectively prevent impurity species, especially metal ions fallen from a cathode catalyst, from being attached to the surface, which causes the sheet resistance to increase, thereby increasing the electrolytic energy consumption.

The invention discloses an electrochemical-catalyst dual-activated reactor for efficiently degrading azo dye by persulfate, which comprises: a reactor main body comprising a pretreatment chamber, a main reaction chamber and a post-treatment chamber which are mounted from bottom to top; the electrochemical unit comprises an anode, a cathode and a direct-current stabilized power supply, and the two ends of the direct-current stabilized power supply are electrochemically connected with the anode and the cathode; the catalyst unit is mounted at the bottom of the main reaction chamber; the liquid conveying system is used for sequentially conveying wastewater and a persulfate solution to the pretreatment chamber, the main reaction chamber and the post-treatment chamber, and the wastewater and the persulfate solution circularly flow in the chambers to finish pretreatment, degradation treatment and post-treatment; and the gas spraying system is used for uniformly inputting gas into the main reaction chamber. The reactor combines a dual activation mechanism of electrochemistry and a catalyst, generates active species with strong oxidizing property, remarkably improves the degradation effect of azo dyes, and has the advantages of high efficiency, simplicity and convenience in operation, wide applicability and the like.

The invention provides a bifunctional oxygen electrocatalyst with an asymmetric coordination structure and a preparation method and application thereof, a porous layered precursor is formed through an amide reaction between melamine and citric acid, and the special structure and different functional groups of the porous layered precursor provide many sites for insertion and adsorption of transition metal ions; and an asymmetric coordination structure with high active sites can be formed, the electronic structure of transition metal ions is effectively optimized, and the electro-catalytic performance is improved. The bifunctional oxygen electrocatalyst prepared by the invention shows excellent ORR / OER activity under alkaline conditions, and the power density of a zinc-air battery driven by the bifunctional oxygen electrocatalyst as a cathode catalyst reaches up to 226.7 mW cm <-2 >.

The utility model provides an electrochemical oxygen reduction device which comprises an oxygen reduction assembly, a first electrode assembly and a second electrode assembly. A cathode plate opposite to the anode plate; a membrane module comprising: a first membrane; an anode catalyst layer provided between the first membrane and the anode plate; and a cathode catalyst layer disposed between the first membrane and the cathode plate; wherein the oxygen reduction assembly is configured to generate an electrochemical reaction which consumes water and generates hydrogen ions at the anode catalyst layer and generate an electrochemical reaction which consumes oxygen and generates water at the cathode catalyst layer under the condition that direct current is applied to the anode plate and the cathode plate, and the electrochemical oxygen reduction device further comprises a second membrane, and a second membrane configured to allow moisture to pass through the second membrane and be delivered to the anode catalyst layer, but not allow oxygen to pass through the second membrane, where the second membrane is integrally formed with the first membrane. The utility model further provides a storage box comprising the electrochemical oxygen reduction device. The overall structure can be simplified, and manufacturing, installation and maintenance are convenient.

The invention is suitable for the technical field of water electrolysis hydrogen production, and provides an alkyne-rich carbon-ruthenium nickel alloy catalyst and a preparation method and application thereof. The preparation method comprises the following steps: simultaneously adding a ruthenium salt solution, a nickel salt solution and an organic molecule solution into an alkyne-enriched carbon dispersion liquid for reaction; and carrying out centrifugation, cleaning and vacuum drying treatment on the reacted mixed solution to obtain the alkyne-rich carbon-ruthenium nickel alloy catalyst. According to the invention, the acetylene-rich carbon-ruthenium nickel alloy catalyst uniformly loaded with ruthenium nickel (RuNi) clusters is successfully prepared. In the performance evaluation of hydrogen production by water electrolysis in a simulated seawater environment, the material shows excellent hydrogen evolution activity as a cathode catalyst. Experimental results show that under the applied potential of-0.6 V (relative to a reversible hydrogen electrode, RHE), the absolute value of the current density can reach 0.847 A cm <-2 > to 0.896 A cm <-2 >. The invention provides a feasible material solution for developing a high-performance water electrolysis hydrogen production catalyst suitable for a complex water quality environment.

The invention discloses an anion exchange membrane electrode and a preparation method and application thereof, and belongs to the technical field of new energy material and catalytic electrode preparation, the method comprises the following steps: S1, preparing an anode catalyst slurry comprising a hydrophobic covalent organic framework material, an anode catalyst, an anion exchange ionomer and a solvent; s2, preparing a cathode catalyst slurry of which the components comprise a cathode catalyst, an anion exchange ionomer and a solvent; and S3, respectively spraying or coating the anode catalyst slurry and the cathode catalyst slurry on two side surfaces of an anion exchange membrane or a gas diffusion layer, and carrying out heat treatment to obtain the anion exchange membrane electrode. The method provided by the invention can solve the problems of large gas-liquid-ion three-phase mass transfer resistance, easy shielding of active catalytic sites by ionomers and unbalanced water management in the membrane electrode assembly in the existing AEMWE device.

The invention relates to a preparation method of a cathode catalyst with a multilevel structure for electro-catalysis of carbon dioxide reduction, and belongs to the field of new energy nano materials and the technical field of electro-catalysis. The invention aims to solve the problems of low selectivity in acidic electrolyte, salt deposition caused by introduction of excessive potassium ions and the like. According to the main scheme, an electrostatic spinning method is adopted for preparing a Zn < 2 + > / PAN nanofiber membrane, then the Zn < 2 + > / PAN nanofiber membrane is soaked in a solution containing nickel salt and 2-methylimidazole for in-situ growth of ZIF-8, meanwhile, adsorption of nickel can be promoted, and finally, high-temperature pyrolysis is conducted to obtain the nitrogen-doped carbon nanotube coated nickel nanoparticles (Ni-coated NCNT / HPNF) with the surfaces modified by hollow porous carbon nanofibers of a multilevel structure. Wherein the hollow porous carbon nanofiber is used as a'trunk ', the nitrogen-doped carbon nanotube is used as a'branch', and the nickel nanoparticles are embedded as a'fruit '. The hierarchical structure can enrich K < + > in the solution in the acidic electrolyte, so that side reaction hydrogen evolution can be inhibited, and the problem of salt deposition is also relieved.

The invention provides a carbon layer coated NiFe nanoparticle difunctional composite electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of new energy materials. A transition metal organic framework compound with specific morphology and size is synthesized from dimethyl imidazole and transition metal salt, then a nitrogen-doped carbon material (Fe-N-C) with specific morphology and high oxygen reduction activity (ORR) and containing transition metal iron is prepared through pyrolysis, the Fe-N-C material is physically mixed with a nickel precursor and an iron precursor, and the nitrogen-doped carbon material is prepared. And the composite difunctional electrocatalyst with high ORR and oxygen evolution reaction (OER) performance of the NiFe nanoparticles coated with the carbon layer is obtained under a microwave heating condition, and can be applied to a metal-air battery as a cathode catalyst.

The invention relates to the field of novel energy conversion, and provides a construction method of an electrochemical device simulating artificial photosynthesis. Comprising the following steps: treating foamed nickel through a FeCl3 solution under the conditions of different concentrations and soaking durations, preparing an iron / nickel-based anode catalyst to separate out oxygen, and selecting foamed copper as a cathode catalyst to reduce carbon dioxide; the solar cell panel is used for converting light energy into electric energy to drive electro-catalytic reaction. According to the construction method of the electrochemical device simulating artificial photosynthesis, the solar panel is used for supplying power, and CO2 reduction reaction is catalyzed while water is electrolyzed. The equipment simulates artificial photosynthesis to realize conversion of water and CO2 into clean energy and low-carbon chemicals. By adopting a mode of combining solar power supply with electro-catalysis, the problems of low efficiency and poor stability of traditional photocatalysis are solved, and the cost of an existing electrochemical catalysis oxygen evolution reaction catalyst is reduced.

Catalyst-coated ion-conducting membrane comprising an anode catalyst layer, a cathode catalyst layer and an ion-conducting membrane layer arranged between the anode catalyst layer and the cathode catalyst layer, wherein: the anode catalyst layer comprises an anode electrocatalyst and an ion-conducting polymer, wherein the anode electrocatalyst comprises particles of a platinum group metal or a platinum group metal alloy, and the anode electrocatalyst is present in the anode catalyst layer with a load of less than 0.20 mg of the platinum group metal per cm² of the anode catalyst layer;and the cathode catalyst layer comprises an ion-conducting polymer and a cathode electrocatalyst comprising platinum-containing particles and a carbon-based support, wherein the carbon-based support comprises individual primary particles or an aggregate of primary particles, the primary particles comprising pores, with some of the platinum-containing particles located within the pores and some of the platinum-containing particles located on an outer surface of the carbon-based support; wherein the platinum-containing particles on the outer surface of the carbon-based support have a mean average particle size of ≤3.0 nm; and wherein less than 50% of the surface area of ​​the platinum-containing particles is in contact with the ion-conducting polymer of the cathode catalyst layer.

An apparatus for the electrochemical reduction of CO2 includes an anode compartment comprising anolytes and a cathode compartment comprising a cathode endplate and a cathode catalyst. The cathode endplate may include recessed flow channels included in a removable plate and / or coated with a hydrophobic coating. A method for the electrochemical reduction of CO2 includes providing the apparatus as described above supplying a CO2 feed stream to the cathode compartment, reducing the CO2 feed stream at the cathode catalyst to form a carbon species by applying a voltage to the device where upon applying the voltage to the device, a portion of the anolytes crossover from the anode compartment to the cathode compartment, forming precipitated salts, and reducing accumulation of precipitated salts in the cathode compartment while reducing the CO2 feed stream at the cathode catalyst. The method may include periodically injecting aqueous acid into the CO2 feed stream.

The utility model relates to the technical field of electro-catalysis ammonia production, in particular to an electrolysis device for ammonia production by alkaline electrolysis of nitrate, which comprises a plurality of electrolysis units and end plates positioned at two ends, the plurality of electrolysis units are overlapped between the two groups of end plates, an anode plate is arranged between the left end plate and the electrolysis unit, and a cathode plate is arranged between the right end plate and the electrolysis unit. A cathode plate is arranged between the right side end plate and the electrolysis unit, and electrode terminals are fixedly arranged on the upper sides of the anode plate and the cathode plate; the electrolysis unit is composed of two sets of bipolar electrode plates, two sets of partition plates and electrolysis cavity grooves, the two sets of partition plates are arranged between the two sets of bipolar electrode plates, the electrolysis cavity grooves are formed in the two sets of partition plates, a diaphragm is arranged between the two sets of partition plates, an anode catalyst layer is arranged on the left side of the diaphragm, and a cathode catalyst layer is arranged on the right side of the diaphragm. According to the utility model, the copper / oxygen double-defect Cu2O-coated Cu heterojunction catalytic electrode is adopted, so that the catalytic activity and selectivity are improved, the energy consumption and the cost are reduced, and a new technical path is provided for green low-carbon ammonia synthesis.

The invention discloses a bioelectricity-Fenton system based on a modified carbon nanotube cathode catalyst and a method for degrading organic pollutants by using the bioelectricity-Fenton system, and belongs to the field of environmental engineering and wastewater treatment. The prepared modified carbon nanotube cathode catalyst has more excellent two-electron oxygen reduction activity and selectivity, and H2O2 can be efficiently produced under bioelectricity driving. A modified carbon nanotube cathode catalyst is coated on an air diffusion electrode with the loading capacity of 0.009-0.279 mg cm <-2 > to serve as a cathode, a carbon brush with electroactive microorganisms stably attached to the surface serves as an anode, a cathode chamber and an anode chamber are separated through a proton exchange membrane, the cathode chamber and the anode chamber are connected through an external wire, a 200-1000 ohm resistor is externally connected, and the air diffusion electrode is formed. The anolyte is a nutrient solution suitable for microbial growth, and the catholyte is organic wastewater to be treated. During wastewater treatment, the cathode and the anode are short-circuited by using a lead, and the pH of the cathode wastewater is adjusted to be 1-3. The system does not need aeration, H2O2 is electrically synthesized in a self-driven mode, the accumulation amount reaches 103.14 mg L <-1 > after 2 h, the H2O2 and additional Fe < 2 + > form a biological electro-Fenton system, and complete degradation of 10 mg L <-1 > sulfamethazine can be achieved within 20 min. According to the invention, the problems of low H2O2 yield and low pollutant treatment efficiency of a bioelectro-Fenton system are solved.

The invention provides a difunctional electrocatalyst prepared by using Joule heat and a preparation method and application thereof, and belongs to the technical field of new energy materials. The preparation method comprises the following steps: synthesizing an organic framework compound by adopting dimethyl imidazole, zinc nitrate and transition metal salt of cobalt (Co), then pyrolyzing to prepare a cobalt-nitrogen-doped carbon material with oxygen reduction (ORR) activity, mixing the cobalt-nitrogen-doped carbon material with a nickel compound and an iron compound respectively, and preparing the cobalt-nitrogen-doped carbon material. Nickel and iron compounds are reduced into alloy nanoparticles in an extremely short time by using Joule heat, and the alloy nanoparticles are directly loaded on the surface of a cobalt-nitrogen-doped carbon material to obtain a high-performance dual-function (ORR and OER) electrocatalyst which can be used as a cathode catalyst to be applied to a metal-air battery.

The application provides an integrated membrane electrode and a preparation method thereof and a device for directional reduction and oxidation regulation synthesis of hydrogen peroxide of anthraquinone derivative compounds, and relates to the technical field of electrocatalysis. The preparation method of the integrated membrane electrode comprises the following steps: mixing a cathode catalyst, a first perfluorosulfonic acid resin solution and a first mixed solvent to obtain a cathode catalyst slurry; mixing an anode catalyst, a second perfluorosulfonic acid resin solution and a second mixed solvent to obtain an anode catalyst slurry; and spraying the cathode / anode catalyst slurry on both sides of a proton exchange membrane respectively to obtain the integrated membrane electrode. The membrane electrode is used in the device for directional reduction and oxidation regulation synthesis of hydrogen peroxide of anthraquinone derivative compounds, water is used as a hydrogen source without using hydrogen, the steam methane reforming process with large scale and high energy consumption is avoided, hydrogen is added in a directional manner, hydrogen peroxide is generated by re-oxidation, and the hydrogen peroxide is not affected by oxygen mass transfer; and the device has the advantages of small reactor area, short process, no secondary pollution and the like.

The invention relates to a tungsten oxide and carbon-loaded platinum catalytic material which is characterized in that tungsten oxide and XC-72C are used as carriers to load platinum, the mass ratio of platinum to tungsten oxide to XC-72C is 1: (9-36): (14-120), and the mass fraction of platinum is 0.5%-4%. Meanwhile, the invention further discloses a preparation method and application of the catalytic material. The preparation method is convenient to prepare and simple to operate, and the obtained Pt-W18O49 / C catalytic material is low in platinum content, high in intrinsic activity and good in stability and can be widely applied as a PEM water electrolysis hydrogen production cathode catalyst.

The present application relates to the technical field of metal phthalocyanine and carbon nanotube composite material, and particularly relates to a nickel phthalocyanine modified carbon nanotube material, a preparation method and application thereof, and the preparation operation of the nickel phthalocyanine modified carbon nanotube material is as follows: carbon nanotubes are added into organic solvent I according to a mass-volume ratio of (50-200) mg:20 mL, and a solution A is obtained by ultrasonic crushing treatment under an ice water bath; nickel phthalocyanine is added into organic solvent II according to a mass-volume ratio of (5-20) mg:20 mL, and a solution B is obtained by ultrasonic crushing treatment under an ice water bath; the solution A and the solution B are mixed according to a volume ratio of 1:1, and are first stirred vigorously at room temperature for 12-36 h, and then vacuum drying is carried out at 60-120 DEG C; the nickel phthalocyanine modified carbon nanotube material exhibits high catalytic activity, good selectivity and excellent conductivity, and can be used for electrocatalytic oxygen reduction to prepare hydrogen peroxide, and can also be used as a solid electrolyte reactor cathode catalyst to produce hydrogen peroxide solution.

The invention discloses a confinement catalyst for electrocatalysis and a preparation method and application thereof, and belongs to the technical field of electrocatalyst.The preparation method comprises the following steps that 2-aminoterephthalic acid and ferric chloride are dissolved in a solvent, and a mixed solution is obtained; performing heat treatment on the mixed solution to obtain a reaction mixture; separating the precipitate from the reaction mixture, washing and drying to obtain a confinement carrier material; dropwise adding a saturated ferric chloride solution into the confinement carrier material, grinding and drying, and then performing high-temperature carbonization to obtain carbonized powder; and dropwise adding the saturated ferric chloride solution into the carbonized powder again, drying, and then carrying out a reduction reaction to obtain the confined catalyst. According to the method, the defects of heavy metal pollution, few active sites, weak conductivity, poor adsorption capacity and the like caused by dissolution of a cathode catalyst for removing nitrate through electro-catalysis can be overcome.

The invention discloses a method for preparing diacetylmonoxime through electro-catalytic co-reduction of nitrate and butanone, and the method comprises the following steps: an electrolyte comprises a nitrogen source and butanone, a palladium-based metal alloy aerogel catalyst is used as a cathode catalyst, and the diacetylmonoxime is prepared through electro-catalytic co-reduction of nitrate and butanone under the action of the cathode catalyst. According to the method provided by the invention, the palladium-based metal alloy aerogel catalyst is applied to a reaction for preparing diacetylmonoxime through electro-catalytic co-reduction of nitrate and butanone, so that side reactions such as hydrogen evolution and ammonia production are remarkably inhibited, the production of diacetylmonoxime is efficiently catalyzed, and the method has excellent electrochemical reduction performance and stability.

The invention discloses a Fe-N-C-at-MXene composite material, a synthesis method thereof and an application of the Fe-N-C-at-MXene composite material in a microbial fuel cell. According to the method, an in-situ growth strategy is adopted, MIL-101 (Fe) is constructed on the surface of single-layer Ti < 3 > C < 2 > T < x > MXene, an MIL-101 (Fe)-MXene composite material with good interface bonding is formed, melamine is introduced as a nitrogen source, synergistic nitrogen doping and carbonization are achieved through high-temperature pyrolysis, and the Fe-N-C-MXene composite material with the high specific surface area and rich active sites is constructed. The Fe-N-C-at-MXene composite material disclosed by the invention not only has excellent conductivity and structural stability, but also has a hierarchical pore channel and a high-density electrocatalytic active center, so that oxygen diffusion and interface reaction kinetics are effectively promoted. In an MFC performance test, as a cathode catalyst, the cathode catalyst remarkably improves the output voltage and the maximum power density of the battery, exceeds a commercial Pt / C catalyst, and shows a wide application prospect.

The invention discloses an electrolytic cell non-noble metal two-component catalyst for direct seawater hydrogen production and a preparation method and application thereof, and belongs to the technical field of seawater electrolysis hydrogen production. The two-component catalyst comprises an anode catalyst and a cathode catalyst; the anode is NiFe-LDH coated CoMoO4 (Ni: Fe = 3: 1, Co: Mo = 1: 1), the cathode is CoMoS3 (Co: Mo = 1: 2), and a hydrothermal method, an electrochemical deposition method and a vulcanization method are adopted for preparation. The catalyst operates in seawater with the salinity of 20-35 g / L, the voltage is 1.8-2.3 V, the current density is 0.8-1.6 A / cm < 2 >, the H2 yield is 2.0-2.3 L / min, the efficiency is 85-90%, and the service life is gt; in 6000 hours, a Cl2 by-product 1t is obtained; and 0.05%. The method does not need pretreatment, uses non-noble metal, and is low in cost, high in corrosion resistance and suitable for green hydrogen energy production.

The invention relates to a preparation method of a dendritic MnOOH-MnO2 (at) Pt monatomic catalyst and application of the dendritic MnOOH-MnO2 (at) Pt monatomic catalyst in an aluminum air battery. The MnO2 nanoparticle loaded Pt monatomic catalyst is accurately synthesized on the MnOOH nanowire through a strategy of'Pt monatomic induction + in-situ symbiosis'. Compared with the MnO2 (at) Pt catalyst with the nanowire-shaped structure, the MnOOH-MnO2 (at) Pt catalyst with the dendritic structure has a local electric field enhancement effect, so that reactants are enriched, and the activity of the oxygen reduction reaction is improved. An electrochemical test result shows that the specific capacity of the aluminum air battery taking MnOOH-MnO2 (at) Pt as the cathode is 2381 mAh g <-1 >, which is far better than that of most cathode catalysts reported at present, and the aluminum air battery can stably run for 650 hours at 50 mA cm <-2 >. By designing the catalyst with a unique dendritic structure, effective regulation and control of a local microenvironment are realized, and a new thought is provided for design and synthesis of the aluminum air battery cathode catalyst.

The invention provides a method for preparing high-value-added acid and hydrogen by electrooxidizing biomass sugar with a nickel-cobalt catalyst, which is characterized in that a platinum net is used as a cathode catalyst, cobalt metal loaded on a foamed nickel substrate is used as an anode catalyst, and a high-value-added organic acid product is obtained at an anode while high-efficiency hydrogen preparation is realized by applying constant voltage. The method has the advantages of high hydrogen / organic acid selectivity, mild conditions and low material cost, is suitable for large-scale production, and has excellent industrial application prospects.

The present invention discloses a surface-modified multi-Mott-Schottky heterostructure bifunctional oxygen electrocatalytic material, a preparation method and its application, belonging to the technical field of electrocatalytic materials. The key points of the technical solution of the present invention are: during the growth of metal organic framework seed crystals, a cerium-containing polytungstate precursor (Ce-POT) is introduced into its shell in situ, and then a surface-modified N@C / Co / CoO / Ce@WO3 / N@C multi-heterostructure electrocatalytic material is derived under a reducing atmosphere. Its beneficial effect is that the entire material has electronic rectification characteristics under the action of multiple heterostructures, so that the outer shell is positively charged, which is beneficial to OH under alkaline conditions. – The adsorption of ions promotes the oxygen evolution reaction (OER); while the negative charge inside the material is conducive to the smooth progress of the four-electron oxygen reduction reaction (ORR), giving the material a double-sided catalytic effect.

The invention discloses a linear iron boride cathode catalyst for a lithium-sulfur battery. The catalyst is prepared based on a molten salt method of a double-salt system, and has the characteristics of high length-diameter ratio and uniform size (the diameter is about 1 micron); according to the present invention, the excellent intrinsic conductivity provides rapid electron supply for the electrochemical reaction of sulfur, and the local limited chemical polarity between iron and boron provides rich adsorption and catalysis sites for the intermediate product lithium polysulfide, such that the shuttle effect is effectively inhibited, and the sulfur-electricity conversion reaction kinetics is improved so as to obtain the good lithium-sulfur battery performance;

The invention relates to a preparation method and application of a cobalt and nitrogen doped porous carbon oxygen reduction catalyst, in particular to a preparation method and application of a cobalt and nitrogen doped porous carbon oxygen reduction catalyst. In order to solve the problem of slow oxygen reduction kinetics of a zinc-air battery, the invention designs an ORR electrocatalyst which is simple in preparation method, rich in pore content and high in active N concentration, and on the basis, an atom-dispersed Co-N-C efficient ORR catalyst containing Co-Nx active sites is prepared through an adsorption impregnation strategy. The electro-catalytic property of the transition metal-N-biomass carbon is improved to the maximum extent. As a cathode catalyst for assembling a zinc-air battery, the composite material shows application potential, and is applied to the technical field of catalyst preparation.

The invention discloses a nano porous nickel electrocatalyst material as well as a preparation method and application thereof. Belongs to the technical field of electrolyzed water hydrogen production catalysts. According to the method, a nickel net substrate is subjected to pretreatment, electrogalvanizing, high-temperature alloying and chemical dealloying, and finally the nano-porous nickel electrocatalyst material growing on the nickel net is obtained. The electrocatalyst material prepared by the method has a uniform three-dimensional nano porous structure, the thickness of a porous layer is 10-70 [mu] m, and the aperture is 100-500 nm. As an alkaline electrolytic water hydrogen evolution reaction cathode catalyst, the material has high specific surface area and rich active sites, and shows lower overpotential and excellent long-term stability. The method is simple in technological process, raw materials are easy to obtain, and the method has large-scale production potential and has wide application prospects in the field of hydrogen production through water electrolysis.