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A kind of bifunctional catalyst for oxygen evolution and oxygen reduction reaction and preparation method thereof

A bifunctional catalyst, oxygen evolution technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc. The problems of large-scale preparation of cost and low bifunctional catalytic performance can achieve the effect of efficient bifunctional catalysis, high bifunctional catalytic performance and low cost.

Active Publication Date: 2021-04-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dual-functional catalytic performance of the above-mentioned composite catalyst system is significantly lower than that of noble metal catalysts, and it is difficult to meet the needs of high-performance battery systems; its preparation method is complicated, and it is difficult to prepare on a large scale at low cost

Method used

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  • A kind of bifunctional catalyst for oxygen evolution and oxygen reduction reaction and preparation method thereof
  • A kind of bifunctional catalyst for oxygen evolution and oxygen reduction reaction and preparation method thereof

Examples

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preparation example Construction

[0026] A method for preparing a dual-functional catalyst for oxygen evolution and oxygen reduction reaction provided by the invention comprises the following steps:

[0027]1) Fully disperse the nano-carbon material, five-membered heterocyclic ring, polyaldehyde and complexing agent in an organic solvent, then add acid and oxidant and stir until mixed evenly, wherein the mass ratio of nano-carbon material to five-membered heterocyclic ring is 1 :1-10:1, the ratio of the amount of substance of the five-membered heterocycle and polyaldehyde is 1:0.1-1:10, the ratio of the amount of the substance of the five-membered heterocycle and the complexing agent is 1:0.5-1: 20; the nano-carbon material adopts one or more of graphite, graphene, carbon nanotube, carbon fiber and carbon black; the five-membered heterocycle is one or both of pyrrole, furan and thiophene; the The polyaldehyde is 3 carbons or more than 3 carbons, and has more than two aldehyde functional groups; the complexing ...

Embodiment 1

[0031] Example 1: Using graphene, pyrrole, and terephthalaldehyde as substrates to prepare bifunctional catalysts containing cobalt-iron oxides

[0032] 1) Add graphene, pyrrole, terephthalaldehyde and cobalt acetate to a 250mL flask, fully disperse in 50mL methanol, then add 5mL trifluoroacetic acid and 5mL nitrobenzene and stir for 5 minutes to mix evenly, wherein the mass of graphene and pyrrole The ratio of pyrrole and terephthalaldehyde is 1:1, the ratio of pyrrole and terephthalaldehyde is 1:0.1, and the ratio of pyrrole and cobalt acetate is 1:0.5;

[0033] 2) The mixture in the above step 1 was reacted at a temperature of 140° C. for 30 minutes. Naturally cool to room temperature after the reaction, filter the reacted product, wash with chloroform, and dry at 60°C to obtain an intermediate product of nitrogen porphyrin organic skeleton;

[0034] 3) Add the obtained nitrogen porphyrin organic skeleton intermediate product, cobalt nitrate, iron nitrate and urea in a 250...

Embodiment 2

[0036] Example 2: Using graphite, pyrrole, furan, and succinic dialdehyde as a substrate to prepare a bifunctional catalyst containing magnesium-aluminum hydroxide

[0037] 1) Add graphite, pyrrole, furan, succinic dialdehyde and manganese acetate to a 250mL flask, fully disperse in 50mL ethanol, then add 5mL formic acid and 5mL dinitrobenzene and stir for 5 minutes to mix evenly, wherein the mass ratio of graphite to pyrrole is 5:1, the ratio of the amount of substance of pyrrole and succinic dialdehyde is 1:1, the ratio of the amount of substance of pyrrole and manganese acetate is 1:5, and the ratio of the amount of substance of pyrrole and furan is 1:1;

[0038] 2) React the mixture in the above step 1 at a temperature of 40° C. for 1 hour. Naturally cool to room temperature after the reaction is completed, filter the reacted product, wash with chloroform, and dry at 80°C to obtain an intermediate product of an organic skeleton of oxygen porphyrin;

[0039] 3) Add the obt...

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Abstract

The invention discloses a dual-function catalyst for oxygen evolution and oxygen reduction reaction and a preparation method thereof, belonging to the technical field of new materials and preparation thereof. The catalyst is a composite material composed of nano carbon material, porphyrin organic framework material and metal oxide or hydroxide. The preparation method of the catalyst uses a certain proportion of nano-carbon material, five-membered heterocycle and polyaldehyde as reactants to prepare the porphyrin organic framework material intermediate through polymerization reaction, and then mixes it with a certain proportion of metal salt and alkali aqueous solution The catalyst is prepared by an in-situ precipitation method. The invention provides a high-performance dual-function catalyst for oxygen evolution and oxygen reduction reaction, which greatly improves the activity of the non-noble metal dual-function catalyst. The synthesis method of the catalyst is simple to operate, low in cost, and easy to scale up, and is expected to be used as a positive electrode catalyst material for metal-air batteries and fuel cells, and to promote the research and application of clean and sustainable energy devices.

Description

technical field [0001] The invention belongs to the technical field of new material design and preparation, and in particular relates to a preparation method of a dual-function catalyst for oxygen evolution and oxygen reduction reaction. Background technique [0002] The depletion of traditional fossil energy and the resulting environmental pollution have created a large demand for clean and sustainable energy in today's society. The rapid development of electric vehicles and the popularity of portable electronic devices have promoted the research of high-performance energy storage devices. High-performance electrochemical energy storage devices are regarded as promising next-generation clean and sustainable energy supply systems, among which systems such as metal-air batteries and fuel cells have received extensive attention due to their high energy density. For example, energy storage devices such as secondary zinc-air batteries use aqueous electrolytes, which reflect the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J31/26B01J31/32H01M4/90
CPCB01J31/28B01J31/26B01J31/32H01M4/9016H01M4/9083B01J35/33Y02E60/50
Inventor 张强李博权刘嘉宁赵长欣
Owner TSINGHUA UNIV
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