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A hollow structure transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst and its preparation method and application

A transition metal and catalyst technology, applied in the field of catalyst preparation, can solve the problems of easy collapse of the structure, influence on the performance of catalytic activity, insufficient exposure of active sites, etc., and achieve the effects of low cost, excellent oxygen reduction catalytic activity and abundant reserves.

Active Publication Date: 2022-07-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is a problem that the structure of MOFs materials is easy to collapse during the pyrolysis process, which will lead to insufficient exposure of the active sites and affect the catalytic activity.

Method used

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  • A hollow structure transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst and its preparation method and application
  • A hollow structure transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst and its preparation method and application
  • A hollow structure transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Using sulfonated polystyrene microspheres with zeolite imidazolate framework compound materials (ZIF-67) grown on the surface as precursors, cobalt and nitrogen co-doped carbon-oxygen reduction catalysts are prepared by high-temperature pyrolysis carbonization, including the following steps:

[0035]Use 10% sodium hydroxide solution to wash styrene monomer and divinylbenzene monomer, and then use deionized water to wash styrene to neutrality; dissolve 0.7 g of cross-linking agent divinylbenzene in 120 mL of ultrapure water, stir evenly, add 14 g of styrene, heat under an inert atmosphere for 1 h, dissolve 0.03 g of potassium persulfate in 10 mL of deionized water, add it to the reaction system, and continue the reaction for 10 h; A saturated NaCl solution was added to the above reaction product, and the precipitate was filtered and dried to obtain polystyrene microspheres. Mix 1.70 g of the polystyrene microsphere template and 60 mL of concentrated sulfuric acid into a ...

Embodiment 2

[0039] The operating conditions were the same as in Example 1, except that during the preparation of the precursor, the reaction time was increased to 18 h. Oxygen reduction performance test of catalyst prepared by pyrolysis carbonization ( Figure 4 ) indicates that the catalyst still exhibits excellent catalytic activity for oxygen reduction.

Embodiment 3

[0041] The operating conditions were the same as in Example 1, except that during the preparation of the precursor, the reaction time was increased to 22 h. Oxygen reduction performance test of catalyst prepared by pyrolysis carbonization ( Figure 4 ) indicates that the catalyst still exhibits excellent catalytic activity for oxygen reduction.

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Abstract

The invention relates to a transition metal cobalt and nitrogen co-doped carbon-oxygen reduction catalyst with a hollow structure, and a preparation method and application thereof. Ethylene microspheres are used as templates, and the zeolite imidazolate metal organic framework material is grown on the surface of the template by the electrostatic interaction between the sulfonic acid groups on the surface of the microspheres and the metal cobalt ions, and then prepared by pyrolysis carbonization in an inert atmosphere. The method provided by the invention can effectively improve the active site utilization rate of the transition metal cobalt and nitrogen co-doped carbon catalyst, the prepared catalyst can efficiently catalyze the oxygen reduction reaction of the fuel cell cathode, and the oxygen reduction catalytic activity is better than that of commercial Pt / C.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a hollow structure transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst, a preparation method and an application thereof, which are used for the cathode oxygen reduction reaction of a fuel cell. Background technique [0002] A fuel cell is a power generation device that produces environmentally friendly and pollution-free water without the emission of carbon dioxide, sulfur dioxide and other gases, so it has received extensive attention from researchers. However, the electrode reaction of fuel cells requires noble metal platinum as a catalyst, and its high cost and scarcity of resources severely restrict the large-scale commercialization of fuel cells. Therefore, it is of great significance to develop non-precious metal oxygen reduction catalysts with high catalytic activity and low price. [0003] Among many non-precious metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/86B82Y40/00
CPCH01M4/9083H01M4/9041B82Y40/00H01M4/861Y02E60/50
Inventor 窦美玲王琨侯柯云杨亚楠王峰
Owner BEIJING UNIV OF CHEM TECH
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