A kind of nano carambola-shaped oxygen reduction electrocatalyst and its preparation method and application

A catalyst and nanotechnology, applied in the field of nano carambola-like oxygen reduction electrocatalyst and its preparation, can solve the problems of poor performance, irregular microscopic appearance, small specific surface area, etc., and achieve excellent performance, good consistency, and specific surface area big effect

Active Publication Date: 2021-09-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these non-precious metal electrocatalysts prepared solely from macrocyclic compounds such as metal phthalocyanine gold or porphyrin have irregular microscopic morphology, small specific surface area, and poor performance.

Method used

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  • A kind of nano carambola-shaped oxygen reduction electrocatalyst and its preparation method and application
  • A kind of nano carambola-shaped oxygen reduction electrocatalyst and its preparation method and application
  • A kind of nano carambola-shaped oxygen reduction electrocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Disperse 75mg of benzoic acid, 8.5mg of 5,10,15,20-tetrakis(4-carboxyphenyl)cobalt porphyrin, 8.5mg of zirconium chloride, and 0.15ml of water in 1.5mL of DMF solution, and react in an oil bath at 120°C for 4h , the product was centrifuged, and the lower layer was taken and washed with ethanol until the filtrate was colorless, and dried at 65°C to obtain a solid powder. The powder was heat-treated for 8 hours at 600°C under argon to obtain the final nano carambola-like oxygen reduction catalyst.

[0024] Such as figure 1 , which is the scanning electron micrograph of the final nano carambola-like oxygen reduction catalyst and the photo comparison of fruit carambola.

[0025] Such as figure 2 , is the oxygen reduction polarization curve of the prepared nano carambola-like oxygen reduction catalyst.

[0026] Test conditions: at 25°C, in oxygen-saturated 0.1M KOH, with a scan rate of 10mV / s, the potential scan test is performed at a voltage of 0-1.2V (vsRHE), and the e...

Embodiment 2

[0028] Disperse 105mg of benzoic acid, 10mg of 5,10,15,20-tetrakis(4-carboxyphenyl)iron porphyrin, 12mg of zirconium chloride, and 0.18ml of water in 2mL of DMF solution, and conduct a hydrothermal reaction in a reactor at 120°C for 48h , the product was centrifuged, and the lower layer was washed with ethanol until the filtrate was colorless, and dried at 65°C to finally obtain a solid powder. The powder was heat-treated for 1 hour under nitrogen at 800°C to obtain the final nano carambola-like oxygen reduction catalyst. .

Embodiment 3

[0030] Disperse 2000mg of benzoic acid, 120mg of 5,10,15,20-tetrakis(4-carboxyphenyl)copper porphyrin, 100mg of zirconium chloride, and 5ml of water in 30mL of DMF solution, react in an oil bath at 110°C for 20h, and centrifuge the product. The lower layer was taken and washed with ethanol until the filtrate was colorless, and dried at 65°C to finally obtain a solid powder. The powder was heat-treated for 5 hours under nitrogen at 800°C to obtain the final nano carambola-like oxygen reduction catalyst.

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Abstract

The invention discloses a nano carambola-like oxygen reduction electrocatalyst, a preparation method and application thereof, and belongs to the field of polymer membrane fuel cell catalysts. Mix zirconium chloride, benzoic acid, tetracarboxyporphyrin or porphin in N,N dimethylformamide solution with a specific ratio, and pyrolyze the obtained product under inert gas to obtain nano carambola-like oxygen reduction electrocatalyst. The invention is simple in operation and easy to control, and the prepared nano carambola-shaped electrocatalyst has uniform microscopic appearance, beautiful appearance, good oxygen reduction activity, and can be used in polymer membrane fuel cells.

Description

technical field [0001] The invention belongs to the field of electrocatalysts for polymer membrane fuel cells, and relates to a nano carambola-like oxygen reduction electrocatalyst, a preparation method and application thereof. Background technique [0002] Due to the advantages of high power density and environmental friendliness, polymer membrane fuel cells have received extensive attention. Platinum-based electrocatalyst is one of the core materials of polymer membrane fuel cells, but platinum is expensive, which limits the wide application of polymer membrane fuel cells. One of the solutions is to develop low-cost, high-efficiency, and high-stability non-precious metal electrocatalysts to replace platinum-based electrocatalysts to promote the commercialization of polymer membrane fuel cells. [0003] Since Jasinski discovered that cobalt phthalocyanine has oxygen reduction activity in alkaline systems in 1964 (Nature, 1964, 201, 1212-1213), many electrocatalysts for oxy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90H01M8/10
CPCH01M4/8878H01M4/90H01M8/10H01M2008/1095Y02E60/50
Inventor 宋玉江韩洪仨张云龙
Owner DALIAN UNIV OF TECH
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