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Preparation method for nitrogen doped graphene-niobium pentoxide intercalation composite catalyst with high oxygen reduction performance

A niobium pentoxide and intercalation composite technology, which is applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of limiting nitrogen-doped graphene and nanoparticles, and achieve the best catalytic effect. , good stability, high methanol tolerance effect

Inactive Publication Date: 2014-03-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of efficient and cheap ORR catalysts remains a great challenge
[0003] In addition, studies have found that nitrogen-doped graphene materials have a good effect on ORR response, but current research is limited to the field of composite materials of nitrogen-doped graphene and nanoparticles

Method used

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  • Preparation method for nitrogen doped graphene-niobium pentoxide intercalation composite catalyst with high oxygen reduction performance
  • Preparation method for nitrogen doped graphene-niobium pentoxide intercalation composite catalyst with high oxygen reduction performance
  • Preparation method for nitrogen doped graphene-niobium pentoxide intercalation composite catalyst with high oxygen reduction performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Niobium pentoxide and potassium carbonate were mixed in a molar ratio of 3:1.1, the resulting mixture was heated to 900°C and maintained for 1 hour, and continued to be heated to 1200°C and maintained for 5 hours. The resulting product was washed with hot water and dried at 200°C for 24 hours. The obtained product was placed in 40 wt% nitric acid solution and stirred for 2 days; repeated 3 times. The resulting product was filtered and washed with distilled water, followed by drying at 50°C for 24 hours. The obtained product was mixed with 4-vinylpyridine at a mass ratio of 1:1, dispersed in water and stirred at room temperature for 3 days. The resulting product was filtered, washed with distilled water, and dried under vacuum at room temperature for 24 hours. The obtained product was heated to 800° C. under an argon atmosphere and maintained for 6 hours, and the target catalyst material could be obtained after cooling.

[0033] Embodiment 1 successfully makes the typ...

Embodiment 2

[0035] Niobium pentoxide and potassium carbonate were mixed in a molar ratio of 3:1.1, the resulting mixture was heated to 900°C and maintained for 1 hour, and continued to be heated to 1200°C and maintained for 5 hours. The obtained product was washed with hot water and dried at 300°C for 24 hours. The obtained product was placed in 40 wt% nitric acid solution and stirred for 2 days; repeated 3 times. The resulting product was filtered and washed with distilled water, followed by drying at 50°C for 24 hours. The obtained product was mixed with 4-vinylpyridine at a mass ratio of 1:1, dispersed in water and stirred at room temperature for 3 days. The resulting product was filtered, washed with distilled water, and dried under vacuum at room temperature for 24 hours. The obtained product was heated to 800° C. under an argon atmosphere and maintained for 6 hours, and the target catalyst material could be obtained after cooling.

Embodiment 3

[0037] Niobium pentoxide and potassium carbonate were mixed in a molar ratio of 3:1.1, the resulting mixture was heated to 900°C and maintained for 1 hour, and continued to be heated to 1200°C and maintained for 5 hours. The resulting product was washed with hot water and dried at 200°C for 24 hours. The obtained product was placed in 40 wt% nitric acid solution and stirred for 3 days; repeated 3 times. The resulting product was filtered and washed with distilled water, followed by drying at 50°C for 24 hours. The obtained product was mixed with 4-vinylpyridine at a mass ratio of 1:1, dispersed in water and stirred at room temperature for 3 days. The resulting product was filtered, washed with distilled water, and dried under vacuum at room temperature for 24 hours. The obtained product was heated to 800° C. under an argon atmosphere and maintained for 6 hours, and the target catalyst material could be obtained after cooling.

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Abstract

The invention relates to a preparation method for nitrogen doped graphene-niobium pentoxide intercalation composite catalyst with a high oxygen reduction performance. The method comprises the following steps: mixing niobium pentoxide and potassium carbonate at the molar ratio of (3:1)-(3:1.5), heating to 600-1000 DEG C, keeping for 1 hour, then heating up to 1050-1300 DEG C, keeping for 1-10 hours; washing by hot water; drying for 1-72 hours at the temperature of 100-500 DEG C; placing obtained products in a 10-68wt% nitric acid solution, stirring for 1-7days; repeating for 2-5 times; filtering and washing by distilled water, drying for 1-72 hours at the temperature of 30-80 DEG C; mixing the product with 4-vinyl pyridine at the mass ratio of (1:0.2)-(1:5), then dispersing in water; stirring for 1-7 days at the room temperature; filtering and washing by the distilled water, performing vacuum drying for 1-72 hours at the room temperature; heating to 700-900 DEG C under the argon atmosphere, keeping the temperature for 1-10 hours, cooling and obtaining the target catalyst. The catalyst has extremely excellent catalysis effect in the oxygen reduction reaction, and delivers better stability, higher methanol tolerance and comparative initial potential fall than a conventional representative Pt / C catalyst.

Description

technical field [0001] The invention belongs to the field of physical chemistry, material chemistry and organic chemistry, and relates to a method for preparing an intercalation composite material of an efficient oxygen reduction catalyst, in particular to a nitrogen-doped graphene-niobium pentoxide intercalation compound with high oxygen reduction performance Method for the preparation of composite materials. Background technique [0002] In recent years, due to the rapid consumption and decreasing reserves of fossil fuels, environmentally friendly, cheap, and efficient renewable energy and related technologies have attracted more and more attention (Liang Y.; Li Y,; Wang H.; Zhou J.; Wang J.; Regier T.; Dai H. Nature Mater. 2011, 10 , 780-786.). Oxygen reduction reaction (ORR) is of great significance to many renewable energy applications, such as metal-air batteries, water splitting, fuel cells, etc. (Liang Y.; Wang H.; Diao P.; Chang W .; Hong G.; Li Y.; Gong M.; Xie...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 唐颐武庆斌廖蕾王思浓张茜戴申恺肖静婧张亚红刘宝红
Owner FUDAN UNIV
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