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Ce-Zr bimetal cluster MOF-based oxygen reduction electrocatalyst and preparation method and application thereof

An electrocatalyst, bimetallic technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of increased oxygen vacancies, unfavorable reaction progress, etc., and achieves high oxygen reduction activity, easy control, and environmental friendliness.

Inactive Publication Date: 2020-05-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the introduction of cerium can improve the activity of the oxygen reduction electrocatalyst, when the content of cerium is too high, the oxygen vacancies will increase, which is not conducive to the progress of the reaction to a certain extent.

Method used

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  • Ce-Zr bimetal cluster MOF-based oxygen reduction electrocatalyst and preparation method and application thereof
  • Ce-Zr bimetal cluster MOF-based oxygen reduction electrocatalyst and preparation method and application thereof
  • Ce-Zr bimetal cluster MOF-based oxygen reduction electrocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 37.5mg ZrOCl 2 ·8H 2 O, 5.6mg Ce(NO 3 ) 3 ·6H 2 Disperse O in 8 mL of DMF solution, add 474 mg of benzoic acid and 34 mg of meso-tetrakis(4-carboxyphenyl) porphine ferric chloride (Fe-TCPP), ultrasonicate at 25 °C for 10 min, react at 120 °C for 12 h, and filter with suction , washed until the filtrate was colorless, dried at 65 °C, and pyrolyzed at 700 °C for 1 h to finally obtain a black powder solid, which was recorded as 20% Ce-Zr-MOF electrocatalyst.

[0034] Such as figure 1 , thermogravimetric analysis shows that the Ce-Zr-MOF electrocatalyst in the present embodiment has better thermal stability, and the detailed description of its weight loss stage is as shown in the figure, and its weight loss stage is divided into five stages; loses free water stage ( 20°C-120°C); Cl - The loss stage (120°C-350°C); the loss stage of the side chain group of the macrocyclic compound (350°C-500°C); the fragmentation stage of the macrocycle compound (500°C-540°C); ).

[0...

Embodiment 2

[0038] 39.5mg ZrOCl 2 ·8H 2 O, 2.8mg Ce(NO 3 ) 3 ·6H 2 Disperse O in 8 mL of DMF solution, add 474 mg of benzoic acid and 34 mg of meso-tetrakis(4-carboxyphenyl) porphine ferric chloride (Fe-TCPP), ultrasonicate at 25 °C for 10 min, react at 120 °C for 12 h, and filter with suction , washed until the filtrate was colorless, dried at 65°C, and pyrolyzed at 700°C for 1 hour to finally obtain a black powder solid. The morphology and performance of the catalyst obtained in Example 2 are similar to those of the sample in Example 1, and it has better overall oxygen reduction performance.

Embodiment 3

[0040] 33.5mg ZrOCl 2 ·8H 2 O, 11.2mg Ce(NO 3 ) 3 ·6H 2 Disperse O in 8 mL of DMF solution, add 474 mg of benzoic acid and 34 mg of meso-tetrakis(4-carboxyphenyl) porphine ferric chloride (Fe-TCPP), ultrasonicate at 25 °C for 10 min, react at 120 °C for 12 h, and filter with suction , washed until the filtrate was colorless, dried at 65°C, and pyrolyzed at 700°C for 1 hour to finally obtain a black powder solid. The morphology and performance of the catalyst obtained in Example 3 are similar to those of the sample in Example 1, and it has better overall oxygen reduction performance.

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Abstract

The invention discloses a Ce-Zr bimetal cluster MOF-based oxygen reduction electrocatalyst and a preparation method and application thereof, and belongs to the field of proton exchange membrane fuel cell catalysts. The preparation method comprises the following steps: dispersing a metal salt in a solvent, adding an organic acid and a macrocyclic compound, carrying out ultrasonic treatment at 20-40DEG C for 10-30 min, carrying out a reaction at 120-150 DEG C for 6-12 h, carrying out suction filtration, washing until the filtrate is colorless, performing drying, and carrying out high-temperature pyrolysis carbonization to obtain the bimetallic cluster MOF-based electrocatalyst. The preparation method is simple to operate, easy to control and environment-friendly, and the prepared bimetalliccluster MOF-based electrocatalyst has very high oxygen reduction activity and can be used for proton exchange membrane fuel cells.

Description

technical field [0001] The invention belongs to the field of electrocatalysts for proton exchange membrane fuel cells, and relates to a Ce-Zr bimetallic cluster MOF-based oxygen reduction electrocatalyst and a preparation method and application thereof. Background technique [0002] In modern times, the rapid consumption of primary energy such as fossil fuels has caused a series of problems such as global energy crisis, global warming and environmental degradation. Therefore, it is imminent to develop energy technologies that are environmentally friendly, sustainable, safe and efficient. Proton exchange membrane fuel cell (PEMFC) has attracted extensive attention of researchers due to its advantages such as high power density, high energy conversion efficiency, fast start-up, and environmental friendliness. [0003] Due to the slow reaction kinetics, complex reaction process, and poor reversibility of the oxidogen reaction on the cathode side of proton exchange membrane fue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9041H01M4/9083Y02E60/50
Inventor 宋玉江张云龙韩洪仨
Owner DALIAN UNIV OF TECH
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