48results about How to "Methanol tolerance is good" patented technology

The invention discloses a cobalt-nitrogen-sulfur co-doped carbon aerogel di-functional oxygen catalyst and a preparation method and application thereof. The method comprises the following steps: uniformly combining cobalt ions with sodium alginate; performing hydrothermal treatment together with dopamine and mercaptan; centrifuging to obtain dopamine / mercaptan / cobalt-sodium alginate hydrogel; performing high-temperature calcination on the dopamine / mercaptan / cobalt-sodium alginate hydrogel obtained after freeze drying to obtain the cobalt-nitrogen-sulfur co-doped carbon aerogel di-functional oxygen catalyst. The catalyst is an aerogel porous material with an average aperture of 2 to 4 nanometers and a specific surface area of 126.8 to 138.3m<2> / g; cobalt exists in the form of a Co simple substance, CoO and Co3O4; a nitrogen atom doped in a porous carbon material mainly exists in the form of pyrrole and graphite. The cobalt, nitrogen and sulfur are co-doped, so that the catalyst has high oxygen evolution and oxygen reduction catalytic activities at the same time under an alkaline condition; moreover, the catalyst has the advantages of adoption of low-cost raw materials, simple preparation method, easiness in operation and convenience for large-scale production.

The invention discloses a nitrogen and cobalt double-doped porous carbon composite bifunctional oxygen catalyst and a preparation method and application thereof. The preparation method comprises the steps that firstly, under a hydrothermal condition, divalent cobalt ions, melamine and sodium alginate are compounded to obtain melamine / cobalt ion-sodium alginate; and secondly, high-temperature calcination is performed, and then the nitrogen-cobalt double-doped porous carbon bifunctional oxygen catalyst is prepared. The catalyst is made of a porous material, the average hole diameter of the catalyst is 2 nm-8 nm, and the specific area is 148.23 m<2> / g-188.27 m<2> / g. According to the catalyst, cobalt exists in the forms of the Co elementary substance, CoO and Co3O4; and nitrogen atoms doped inthe porous carbon material exist in the forms of pyrrole and pyridine. Due to double doping of the cobalt and nitrogen, the catalyst has high oxygen evolution and oxygen reduction catalytic activity,good stability and excellent methyl alcohol tolerance at the same timeunder alkaline conditions, used raw materials are low in cost, the preparation method is simple, operation is easy, and large-scale production is convenient.

The invention relates to a cobalt monoatomic catalyst with cobalt atoms anchored on carbon nanofibers and a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving a cobalt source, a complexing agent and a nitrogen-containing polymer in a solvent to obtain an external solution; An internal solution in which the soluble polymer is dissolved in a solvent; 2, spinning theouter solution and the inn solution into primary spinning fibers by coaxial electrostatic filament spinning; S3: after removing the soluble polymer from the silk spinning fiber, calcining at 500-1000 DEG C for 2-5h to obtain the cobalt monoatomic catalyst. The cobalt monoatomic catalyst prepared by electrostatic filament spinning technology and high-temperature calcination has the advantages of small diameter, small pore size, high porosity, good fiber homogeneity, good ORR and OER catalytic performance, excellent methanol tolerance and stability, and can be widelyapplied to fuel cells and metal-air batteries. The preparation method provided by the invention is simple in process and easy to operate.

The invention discloses a non-noble metal catalyst and a preparation method thereof. The non-noble metal catalyst is obtained by subjecting a first mixture containing an aromatic nitrile compound anda metal oxide in the presence of a nonactive gas and Lewis acid to heat treatment, wherein the metal oxide is a nanoparticle. The non-noble metal catalyst provided by the invention has good catalyticactivity, methanol resistance and stability, is low in production cost, and can be produced and applied on a large scale in fuel cells.

The invention belongs to the technical field of proton membrane fuel cell catalysts, and discloses an iron-nickel polyphenol network nano-composite carbon material electrocatalyst based on chitosan modified cellulose aerogel and a preparation method of the iron-nickel polyphenol network nano composite carbon material electrocatalyst. The preparation method comprises steps of using chitosan as a modifier of nano cellulose to prepare chitosan / nano cellulose composite aerogel as a catalyst carrier; preparing an iron-nickel doped CS / CNC-coated FeNi precursor with a supramolecular framework through water bath oscillation, and finally performing high-temperature carbonization to obtain the iron-nickel supramolecular network framework nanocomposite electrocatalyst. The CCTS-CA@Fe0.64Ni0.36 nano composite material prepared by the preparation method disclosed by the invention has good conductivity, high chemical stability and thermal stability and good electrocatalytic property, can be used as an efficient electrocatalyst capable of replacing traditional commercial Pt / C, and has great potential application value.

The invention belongs to the field of oxygen reduction electro-catalysis, and particularly relates to an ultrasonic synthesis method and an application of a spiral ferronickel supramolecular network framework nano composite material. An active substance of the nano material is C@ NiFe2O4 and presents a spiral-like shape, and the ultrasonic synthesis method is simple, low in cost, and short in reaction time. And the synthesized composite material is high in yield, uniform in morphology, large in specific surface area and easy to realize industrial production. The method is used for overcoming the defects that an existing fuel cell catalyst is low in cathode oxygen reduction reaction reversibility and small in exchange current density, and a Pt-based catalytic material is high in cost, has toxicity and the like, and the obtained oxygen reduction catalyst has the advantages of high potential, excellent limiting current, high stability, methanol tolerance and the like so that as the high-efficiency electrocatalyst, the C@ NiFe2O4 has a great potential application value.

The invention discloses a preparation method and application of a Zn / Co-N-C carbon nanotube oxygen reduction catalyst for autocatalytic growth. The preparation method comprises the following steps: stirring a methanol dispersion of 2-methylimidazole zinc salt and a methanol dispersion of zinc nitrate hexahydrate, graphene oxide and cobalt acetylacetonate (III) at room temperature to obtain a mixture; carrying out centrifugation, methanol washing and drying treatment, carrying out high-temperature calcination under the protection of inert gas, and cooling to room temperature; and soaking the product in acid, washing for multiple times, and drying to obtain the target product Zn / Co-N-C carbon nanotube oxygen reduction catalyst. The carbon nanotube oxygen reduction catalyst prepared by the invention has a hierarchical porous property, and shows excellent oxygen reduction activity, cycling stability and methanol tolerance in both alkaline and acidic electrolytes. When the prepared carbon nanotube oxygen reduction catalyst is applied to a cathode of a zinc air battery, good power density and satisfactory cycling stability are shown.

The invention belongs to the technical field of oxidant preparation, and discloses a dual-function catalyst for oxygen precipitation and oxygen reduction and a preparation method thereof. The nickel foam is immersed in HCl solution, cleaned with deionized water, and then dried in an oven; Put the nickel foam into the containing CoCl 2 ·6H 2 O and NiCl 2 ·6H 2 In the solution of O, cyclic voltammetry is used to deposit nickel hydroxide cobalt composite material on the surface of nickel foam; the foam nickel obtained after electrodeposition is taken out, washed and dried; the mixture of foam nickel and melamine and thiourea are placed in the double zone respectively The temperature controls the downwind portion and the upwind portion of the tube furnace for heating. The onset potential of the catalyst of the present invention is 1.52V (vs.RHE) in OER, and in ORR, compared with 20% commercial Pt / C, the onset potential is 0.95V (vs.RHE), which has better Methanol tolerance and stability.

The invention discloses a stamen-type S-doped manganese-copper electrocatalyst based on metal polyphenol modified sodium alginate / nanocellulose composite airgel, and the manganese-copper electrocatalyst is C@MnOCu 7.2 S 4 -TA. The nanocellulose prepared by the acid hydrolysis method introduces a large amount of sulfur doping, and the three-dimensional network structure of the sodium alginate / nanofiber composite airgel has a large number of pores as a porous carbon template, which increases the contact area with the precursor metal solution, making the tannin The modified metal polyphenol network is uniformly distributed in the sodium alginate / nanofiber composite airgel. The nanocomposite material synthesized after high temperature carbonization presents a stamen shape. The invention is used to solve the shortcomings of existing fuel cell catalysts, such as low reversibility of cathode oxygen reduction reaction, small exchange current density, high cost of Pt-based catalytic materials and poor toxicity resistance, etc. The obtained oxygen reduction catalyst has high potential, Excellent limiting current and high methanol tolerance and other advantages.

The invention relates to a nitrogen-doped graphene-ferronickel hydrotalcite non-noble metal difunctional oxygen catalyst and a preparation method thereof and electrocatalysis application of the oxygen catalyst in an alkaline medium to an oxygen evolution reaction and an oxygen reduction reaction. According to the catalyst, a micelle is taken as a template, ferronickel hydrotalcite is assembled on graphene oxide under the hydrothermal condition to form a spherical porous compound, the graphene oxide is reduced and doped with a nitrogen carbide nanosheet simultaneously under the hydrothermal condition, and then the nitrogen-doped graphene-ferronickel hydrotalcite oxygen catalyst is obtained. The method comprises the steps that the graphene oxide and metal salt are firstly dispersed into the micelle, the graphene oxide-ferronickel hydrotalcite compound is obtained through hydro-thermal synthesis under the alkaline condition, the product is doped with the nitrogen carbide nanosheet under the hydrothermal condition, and then the oxygen catalyst is obtained. The oxygen catalyst has the catalytic activity both on oxygen evolution and oxygen reduction under the alkaline condition and is high in stability and methyl alcohol tolerance, low in used raw material cost, simple in preparation method and convenient for scale production.

The invention relates to a method for preparing a bayberry-shaped cobalt-nickel-boron composite carbon material proton membrane fuel cell catalyst. The nanomaterial active substance is a bayberry-shaped cobalt-nickel-boron composite carbon material, referred to as CoNi@TA / B. Solve the existing problems of existing fuel cell catalysts and overcome the defects of the prior art. At present, fuel cell catalysts generally face the problems of single precursor and synthesis cost, as well as defects such as high cost and toxicity of Pt-based catalytic materials; based on CoNi MOF With a unique structure, a metal-organic framework nanocomposite material for proton membrane fuel cells has been developed, which has high onset potential, half-slope potential, excellent limiting current, excellent stability and good methanol tolerance, It has the advantages of strong resistance to methanol poisoning.

The invention discloses a preparation method and application of a zinc-based metal-organic framework material and its iron-nitrogen co-doped carbon-based oxygen reduction electrocatalyst. The catalyst of the invention is based on a newly designed zinc-based metal-organic framework material. The precursor Fe-Zn-TTPA was prepared by one-pot method based on metal-organic framework materials, and the precursor Fe-Zn-TTPA was carbonized at high temperature to obtain an iron-nitrogen-carbon-oxygen reduction electrocatalyst. The material of the invention is simple and easy to obtain, and the cost is low. The prepared iron-nitrogen co-doped carbon-based oxygen reduction electrocatalyst has high oxygen reduction catalytic activity, good stability and methanol tolerance, and can replace the noble metal Pt / C catalyst as The application of catalytic materials in fuel cells or metal-air batteries has broad application prospects and practical value.

The invention provides a ZIF-8-based nickel-iron-nitrogen-doped carbon material trifunctional electrocatalyst and its preparation method and application, belonging to the technical field of electrochemical catalysis. The invention provides a ZIF-8-based nickel-iron-nitrogen-doped carbon material trifunctional electrocatalyst, which has a core-shell structure, and the core layer is composed of nanoparticles containing iron and nickel elements, and is composed of nitrogen-doped carbon materials Shell. The electrocatalyst provided by the present invention has a core-shell structure, which can accelerate the electron transfer efficiency of the reaction process; the doping of iron, nickel and nitrogen changes the electronic structure and morphology of the carbon material, and improves the conductivity and catalytic performance of the catalyst. Therefore, the electrocatalyst provided by the present invention exhibits excellent multifunctional electrocatalytic performance, has good methanol tolerance and cycle stability, and has potential application value in technologies such as fuel cells and electrolyzed water.

The invention discloses a preparation method of leaf-based nitrogen-doped porous carbon, and application of the leaf-based nitrogen-doped porous carbon in oxygen reduction electro-catalysis in a full pH range. The preparation method comprises the following steps: cleaning, drying and grinding leaf-based biomass; weighing a certain amount of a biomass powder material, soaking the biomass powder material in an acetic acid-sodium acetate solution containing hemicellulase, standing for a period of time at a constant temperature, hydrolyzing, filtering, washing, drying, pre-carbonizing in an inert atmosphere, cooling to room temperature, grinding into powder, weighing the powder, a nitrogen source and an activating agent according to a mass ratio, performing high-energy vacuum mechanical ball milling, performing high-temperature carbonization on the ball-milled mixture in an inert atmosphere, performing acid pickling, filtering washing with water until filtrate is neutral, and drying to obtain the nitrogen-doped porous carbon material. Biomass is modified by utilizing an enzyme synergistic high-energy vacuum mechanical force ball milling method, and the prepared nitrogen-doped porous carbon material is large in specific surface area, obvious in hierarchical pore structure and rich in nitrogen content, and has excellent ORR electrocatalytic activity in a whole pH range (0-13).

The invention discloses a method for preparing a copper hydroxide two-dimensional nanocomposite material based on iron-based dopamine supramolecular modification, which uses CuCl 2 , PEG, etc. as raw materials to prepare Cu(OH) 2 nanosheets, which were then dispersed in absolute ethanol to obtain Cu(OH) 2 solution, then add dopamine and Fe(NO) 3 9H 2 O, through hydrothermal reaction and heat treatment, a 2D material that can be used as a fuel cell anode material is finally prepared Cu(OH)2 @PDA‑Fe. The composite material obtained in the present invention has higher initial potential, half-slope potential, excellent limiting current, excellent stability and good methanol tolerance, has strong resistance to methanol poisoning, etc., and can solve the problem of existing fuel cells. The catalyst has problems such as single precursor, high cost and toxicity of Pt-based catalytic materials, and it is expected to be used to replace Pt / C catalysts.

The invention belongs to the technical field of fuel cell catalysts, and in particular relates to a synthesis method and application of a copper polyphenol-triazine supramolecular network structure nanocomposite material. The method comprises the following steps: weighing 1,3,5-triazine-2,4,6-triamine and saturated polycyclic ketone, reacting to obtain covalent triazine-based organic polymer CTP; making CTP into CPT-polyphenol solution ; Combine the copper polyphenol solution and the CPT polyphenol solution to react; centrifuge and dry the product obtained from the reaction to obtain a precursor; the precursor is calcined under an inert atmosphere to obtain a copper polyphenol triazine supramolecular network structure nanocomposites. The present invention uses a covalent triazine-based organic polymer as the base material, and obtains a nanocomposite material with excellent oxygen reduction performance through the functional modification means of the polyphenol network, and realizes the combination of the metal polyphenol network and the triazine polymer skeleton. Closely combined, it has the characteristics of cost-effective, green and environmental protection.

The invention relates to a cobalt single-atom catalyst in which cobalt atoms are anchored on carbon nanofibers, a preparation method and application thereof. The preparation method includes the following steps: S1: dissolving cobalt source, complexing agent and nitrogen-containing polymer in a solvent to obtain an external solution; dissolving a soluble polymer in a solvent to obtain an internal solution; S2: using a coaxial electrostatic wire Spinning the external solution and the internal solution to obtain the as-spun fiber; S3: After removing the soluble polymer in the spun fiber, calcining at 500-1000°C for 2-5 hours at a high temperature to obtain the cobalt single-atom catalyst. The cobalt single-atom catalyst prepared by the electrostatic spinning technology and high-temperature calcination has the advantages of small diameter, small pore size, high porosity, good fiber uniformity, etc., and has good ORR and OER catalytic performance, excellent methanol resistance Acceptability and stability, can be widely used in fuel cells, metal-air batteries. The preparation method provided by the invention has simple process and is easy to operate.

The invention relates to a preparation method of a plant polyphenol-modified supramolecular network frame structure manganese-based nanocomposite electrocatalyst, wherein the nanomaterial active substance is ZIF-8@TA-Mn. Solve the problems of existing fuel cell catalysts and overcome the defects of the existing technology. At present, fuel cell catalysts generally face the problems of single precursor and synthesis cost, as well as the high cost and toxicity of Pt-based catalytic materials. Based on ZIF‑ 8 Unique structure, developed a metal-organic framework nanocomposite for proton membrane fuel cells with high onset potential, half-slope potential, excellent limiting current and excellent stability and good methanol tolerance , has the advantages of strong anti-methanol poisoning ability.

The invention relates to a MoS2 nanosphere difuncitonal oxygen catalyst of a hierarchy structure a preparation method thereof and application thereof in electrocatalyzing oxygen in an alkaline medium. The MoS2 nanosphere difuncitonal oxygen catalyst is MoS2 nanospheres which are synthesized by taking Na2MoO4 and KSCN as raw materials and adopting a hydrothermal method and have the hierarchy structure, and the MoS2 nanospheres are formed by a plurality of MoS2 nanosheets, so that the MoS2 nanospheres have a large specific surface area, and edge sits of the MoS2 nanosheets are fully exposed. Due to multiporous flower-shaped nanospheres formed by ultra-thin MoS2 nanosheet units, the effective electrochemical catalysis area and the catalytic sites are increased, and the electron conduction rate is quickened, so that overpotential of an oxygen evolution reaction and an oxygen reduction reaction can be effectively reduced; a rotating disk electrode and a rotating ring disk electrode show that the oxygen reduction process is based on a four-electron catalytic mechanism and is a relatively ideal oxygen reduction reaction process.

The invention discloses a hollow CeO 2 Sphere@Co‑N / C nanocomposite material and its preparation method and application, including: contact reaction between cerium salt and polydopamine nanospheres, and obtain hollow CeO through air gradient calcination 2 spheres; in the second solvent, the hollow CeO 2 spheres, cobalt source, D‑(+) glucosamine hydrochloride for contact reaction to prepare hollow CeO 2 spheres@Co‑N / C precursor; the hollow CeO 2 The sphere@Co‑N / C precursor was calcined under nitrogen atmosphere. The catalytic performance of the composite material is equivalent to that of Pt and Pt-based catalysts, the catalytic performance is good, and the cost of the catalyst can be reduced, and it has the stability of oxygen reduction catalytic performance and methanol tolerance. The composite material can efficiently catalyze the fuel cell cathode oxygen reduction reaction, and its preparation method has the advantages of greenness, cleanness, high efficiency, simplicity and low cost.