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Hollow-structured transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst as well as preparation method and application thereof

A transition metal and catalyst technology, applied in the field of catalyst preparation, can solve the problems of insufficient exposure of active sites, easy collapse of structure, and influence on catalytic activity, so as to promote exposure and mass transfer of reactants, low cost, and oxygen reduction catalysis Excellent active effect

Active Publication Date: 2020-12-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Hollow-structured transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst as well as preparation method and application thereof
  • Hollow-structured transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst as well as preparation method and application thereof
  • Hollow-structured transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0035]Styrene monomer and divinylbenzene monomer were washed with sodium hydroxide solution with a mass fraction of 10%, and then styrene was washed to neutrality with deionized water; 0.7 g of crosslinking agent divinylbenzene was dissolved in 120 Add 14 g of styrene in mL of ultrapure water, stir evenly, heat and react for 1 h under an inert atmosphere, 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; Saturated NaCl solution was added to the reaction product, and the precipitate was filtered and dried to obtain polystyrene microspheres. Mix 1.70 g polystyrene microsphere template and 60 mL con...

Embodiment 2

[0039] The operating conditions were the same as in Example 1, except that the reaction time was increased to 18 h during the preparation of the precursor. Oxygen reduction performance test of catalyst prepared by pyrolytic 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 the reaction time was increased to 22 h during the preparation of the precursor. Oxygen reduction performance test of catalyst prepared by pyrolytic 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 hollow-structured transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst as well as a preparation method and application thereof. A zeolite imidazatemetal organic framework material grows on the surface of a template by utilizing electrostatic interaction between sulfonic acid groups on the surfaces of microspheres and metal cobalt ions, and thenthe zeolite imidazate metal organic framework material is prepared by pyrolysis and carbonization in an inert atmosphere. According to the method provided by the invention, the active site utilization rate of the transition metal cobalt and nitrogen co-doped carbon catalyst can be effectively improved, the prepared catalyst can efficiently catalyze the oxygen reduction reaction of the cathode ofthe fuel cell, and the oxygen reduction catalytic activity is superior to 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 and its preparation method and application, which are used for the cathode oxygen reduction reaction of fuel cells. Background technique [0002] Fuel cell is a kind of power generation device, and the product is environmentally friendly and pollution-free water, without the emission of carbon dioxide, sulfur dioxide and other gases, so it has attracted extensive attention from researchers. However, the noble metal platinum is needed as a catalyst for the fuel cell electrode reaction, and its high cost and scarcity of resources seriously restrict the large-scale commercialization of fuel cells. Therefore, it is of great significance to develop non-noble metal oxygen reduction catalysts with high catalytic activity and low price. [0003] Among many non-noble...

Claims

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Application Information

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Patent Type & Authority Applications(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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