Composite-structure Co-Nx/C monatomic catalyst, preparation method thereof and fuel cell

A composite structure and catalyst technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of unsatisfactory electrochemical energy conversion efficiency, low catalytic single-atom Co loading, unsatisfactory catalytic activity, etc., to achieve rich catalytic reactions Active sites, beneficial effects on stability, structure and performance stabilization

Active Publication Date: 2021-05-04
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a composite structure Co-N x /C single-atom catalyst and its preparation method to solve existing Co-N x /C SACs catalysts have technical problems such as low catalytic single-atom Co loading, unstable active sites, res

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  • Composite-structure Co-Nx/C monatomic catalyst, preparation method thereof and fuel cell
  • Composite-structure Co-Nx/C monatomic catalyst, preparation method thereof and fuel cell
  • Composite-structure Co-Nx/C monatomic catalyst, preparation method thereof and fuel cell

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preparation example Construction

[0047] Correspondingly, the embodiment of the present invention also provides the above-mentioned composite structure Co-N x The preparation method of / C single-atom catalyst. The composite structure Co-N x The preparation design route of / C single-atom catalyst is as follows figure 2 , according to this design route, the composite structure Co-N x The technological process of / C single-atom catalyst preparation method is as image 3 shown, combined with figure 1 , which includes the following steps:

[0048] Step S01: performing a first mixing treatment with a first Co elemental precursor solution containing zinc ions and a first organic ligand and performing a first coordination reaction to generate a first bimetallic ZnCo-MOF precursor;

[0049] Step S02: performing a second mixing treatment on the suspension containing the first bimetallic ZnCo-MOF precursor, a second Co elemental precursor solution containing zinc ions, and a second organic ligand, and performing a ...

Embodiment 1

[0065] This embodiment provides a composite structure Co-N x / C single atom catalyst and its preparation method. The composite structure Co-N x The structure of / C single-atom catalyst is as follows figure 1 As shown, it is a double-shell hollow structure, including an inner shell 2 and an outer shell 4 covering the inner shell 2, and the inner shell 2 is covered to form a cavity 1, and the inner shell 2 and the outer shell 4 There is a gap 3 between them; wherein, the materials of the inner shell layer 2 and the outer shell layer 4 both contain Co-N x / C single atom catalyst material. Based on the composite structure Co-N x The structure of / C single-atom catalyst, the composite structure Co-N of the embodiment of the present invention x / C single-atom catalyst is denoted as DS·Co-N x / C SACs catalyst.

[0066] DS·Co-N x The preparation method of / C SACs catalyst comprises the following specific steps:

[0067] S1: Co(NO 3 ) 2 ·6H 2 O 1.8mmol, Zn(NO 3 ) 2 ·6H 2...

Embodiment 2

[0072] S1: Co(NO 3 ) 2 ·6H 2 O 1.8mmol, Zn(NO 3 ) 2 ·6H 2 O 1.8mmol was dissolved in 15mL of methanol, and stirred to form a clear and transparent solution A; about 10.8mmol of 2-methylimidazole was dissolved in 15mL of methanol to form a clear and transparent solution B;

[0073] S2: After mixing solution A and solution B in step S1, stir at room temperature for 12 hours, and perform a coordination reaction; after the reaction, add a certain amount of methanol in sequence, filter, wash, and dry to obtain a bimetallic ZnCo-MOF precursor body; get 50mg of ZnCo-MOF precursor, dispersed in 30mL of methanol to form ZnCo-MOF precursor suspension;

[0074] S3: Co(NO 3 ) 2 ·6H 2 O 0.03mmol, Zn(NO 3 ) 2 ·6H 2 O 0.26mmol, dissolved in 10mL of methanol to form a clear and transparent solution C; about 0.0985g (1.2mmol) of 2-methylimidazole was dissolved in 10mL of methanol to form a clear and transparent solution D, after mixing solution C and solution D, Then add it to the ...

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Abstract

The invention discloses a Co-Nx/C monatomic catalyst with a composite structure, a preparation method of the Co-Nx/C monatomic catalyst and a fuel cell. The Co-Nx/C monatomic catalyst with the composite structure is of a double-shell hollow structure and comprises an inner shell and an outer shell wrapping the inner shell, the inner shell forms a cavity in a wrapping mode, and a gap is formed between the inner shell and the outer shell; and the materials of the inner shell and the outer shell oth contain Co-Nx monatomic active sites. The composite structure can provide and expose a large number of catalytic active sites, the utilization rate of the catalytic active sites is increased, the stability of the catalytic active sites is good, and the mass-charge transfer efficiency of the catalytic active sites is high. The preparation method is easy in process condition control, stable structure and performance of the Co-Nx/C monatomic catalyst can be guaranteed, and the efficiency is high. The fuel cell comprises the composite-structure Co-Nx/C monatomic catalyst, so that the electrochemical energy conversion efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a composite structure Co-N x / C single-atom catalyst and its preparation method and fuel cell. Background technique [0002] Since the 21st century, energy issues have become one of the most important factors restricting human development. Finding new energy sources to replace traditional non-renewable energy sources is an important way to solve energy issues. Among the new energy technologies that have been developed, the proton exchange membrane fuel cell directly converts chemical energy into electrical energy through the reaction of catalyst and fuel with oxygen. The energy efficiency is as high as 70%, the product is mostly water, and the damage to the environment is extremely low. It is the most One of the potential energy storage technologies. [0003] In the proton exchange membrane fuel cell, the cathode electrocatalytic oxygen reduction reaction (ORR) is an importa...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M4/90
CPCH01M4/8657H01M4/90H01M4/9083H01M4/8885Y02E60/50
Inventor 郑智平张新瑜李岩岩
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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