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

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 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.