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: 2019-07-05
TSINGHUA UNIV
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  • Claims
  • Application Information

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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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  • Bifunctional catalyst for oxygen evolution and oxygen reduction reaction and preparation method thereof
  • Bifunctional catalyst for oxygen evolution and oxygen reduction reaction and preparation method thereof
  • 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 relates to a bifunctional catalyst for the oxygen evolution and oxygen reduction reaction and a preparation method thereof, and belongs to the technical field of new materials and the preparation thereof. The catalyst is a composite material composed of a nano-carbon material, a porphyrin organic skeleton material and a metal oxide or hydroxide. The preparation method of the catalystis that: the porphyrin organic skeleton material intermediate is prepared by the polymerization reaction of the nano-carbon material, a five-membered heterocycle and a polyaldehyde according to a certain proportion, and then the porphyrin organic skeleton material intermediate is mixed with an aqueous solution of a metal salt and an alkali according to a certain proportion to prepare the catalystby the in-situ precipitation method. The high-performance bifunctional catalyst for the oxygen precipitation and oxygen reduction reaction is provided, and the activity of the non-noble metal bifunctional catalyst is greatly improved. The synthesis method of the catalyst has the advantages of simple operation, low cost and easy amplification, the catalyst is expected to be used as a cathode catalytic material for metal-air batteries and fuel cells, and thus the research and application of clean and sustainable energy devices is promoted.

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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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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