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Method for preparing nitrogen-doped carbon nanotube fuel cell catalyst

A nitrogen-doped carbon, fuel cell technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., to achieve the effects of simple and easy method, avoidance of corrosion, and high-efficiency oxygen reduction catalytic performance

Inactive Publication Date: 2012-04-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention in this experiment is to provide a method for preparing nitrogen-doped carbon nanotube fuel cell catalysts in view of the problems existing in the preparation methods of nitrogen-doped carbon nanotubes

Method used

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  • Method for preparing nitrogen-doped carbon nanotube fuel cell catalyst
  • Method for preparing nitrogen-doped carbon nanotube fuel cell catalyst
  • Method for preparing nitrogen-doped carbon nanotube fuel cell catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of nitrogen-doped carbon nanotube catalyst

[0030] Weigh melamine and ferrocene according to the mass ratio of melamine:ferrocene as 1:2, grind and mix the melamine and ferrocene evenly and place them in the low temperature zone of the tube furnace, place the quartz sheet in the high temperature zone of the tube furnace zone, first pass nitrogen into the tube furnace for 0.5 hours to remove the air in the tube furnace. The nitrogen gas brings the sublimated precursor into the high-temperature zone, and the flow rate of the nitrogen gas is controlled to be 50 ml / min. After 40 minutes of reaction, nitrogen-doped carbon nanotubes are obtained.

[0031] (2) Purification of nitrogen-doped carbon nanotube catalysts

[0032] Oxidize the nitrogen-doped carbon nanotube catalyst prepared in step (1) at 200°C for 6 hours to remove the amorphous carbon therein, then heat and stir the above product with concentrated nitric acid to reflux for 5 hours, filter, wash, ...

Embodiment 2

[0036] (1) Preparation of nitrogen-doped carbon nanotube catalyst

[0037]Weigh urea and ferrocene according to the mass ratio of urea:ferrocene as 1:4, grind and mix the urea and ferrocene evenly and place them in the low temperature zone of the tube furnace, place the quartz sheet in the high temperature zone of the tube furnace zone, first pass nitrogen into the tube furnace for 1 hour to remove the air in the tube furnace, after the ventilation is over, raise the temperature of the low temperature zone to 200°C, and the temperature of the high temperature zone to 600°C. The nitrogen gas brings the sublimated precursor into the high-temperature zone, and the flow rate of the nitrogen gas is controlled to be 100 ml / min. After 20 minutes of reaction, nitrogen-doped carbon nanotubes are obtained.

[0038] (2) Purification of nitrogen-doped carbon nanotube catalysts

[0039] Oxidize the nitrogen-doped carbon nanotube catalyst prepared in step (1) at 300°C for 3 hours to remove...

Embodiment 3

[0043] (1) Preparation of nitrogen-doped carbon nanotube catalyst

[0044] Weigh melamine and ferrocene according to the mass ratio of melamine:ferrocene as 1:1, grind and mix the melamine and ferrocene evenly and place them in the low temperature zone of the tube furnace, place the quartz sheet in the high temperature zone of the tube furnace zone, first pass 0.8 hours of argon into the tube furnace to remove the air in the tube furnace. Enter argon gas to bring the sublimated precursor into the high temperature zone, control the flow rate of argon gas to 150 ml / min, and obtain nitrogen-doped carbon nanotubes after 80 minutes of reaction.

[0045] (2) Purification of nitrogen-doped carbon nanotube catalysts

[0046] Oxidize the nitrogen-doped carbon nanotube catalyst prepared in step (1) at 400°C for 10 hours to remove the amorphous carbon, then heat and stir the above product with concentrated nitric acid to reflux for 5 hours, filter, wash and dry A purified nitrogen-dope...

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Abstract

The invention provides a method for preparing a nitrogen-doped carbon nanotube fuel cell catalyst, aiming at the problems existing in the preparation methods of the existing nitrogen-doped carbon nanotubes. In the method, a double-temperature area method is adopted to prepare a nitrogen-doped carbon nanotube, firstly a solid carbon source and nitrogen source precursor is put in a low-temperature area to be heated to be sublimated and then the sublimated precursor is brought into a high-temperature area by carrier gas to deposit the carbon nanotube; corrosion of gas inlet pipelines and equipment interfaces can be effectively avoided by putting the precursor in the low-temperature area; and meanwhile the flow velocity of the carrier gas is lower, so the precursor can fully react in the high-temperature area, thus improving the yield of the nitrogen-doped carbon nanotube. The method is simple and practicable, is safe to operate and has low production cost. The nitrogen-doped carbon nanotube catalyst prepared by the method can be applied in the field of fuel cells. The catalyst prepared by the method has efficient oxygen reduction catalytic property and potential in comparing favourably with and replacing the Pt / C catalyst.

Description

1. Technical field: [0001] The invention belongs to the technical field of fuel cells, in particular to a method for preparing a nitrogen-doped carbon nanotube fuel cell catalyst. 2. Background technology: [0002] Fuel cells have the advantages of high energy conversion efficiency, environmental friendliness, and rapid start-up at room temperature, and are considered to be the most promising chemical power sources for electric vehicles and other civilian applications in the future. In the process of fuel cell industrialization, its cost and life problems have always been the core issues that plague its development. Currently, the main reason for the high cost of fuel cells is the extensive use of the precious metal Pt. Due to the high price of Pt and the scarcity of resources, the development of non-Pt catalysts and the improvement of catalyst activity have become the focus of research on fuel cell catalysts. Nitrogen-doped carbon nanotubes have attracted extensive attent...

Claims

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Application Information

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IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 魏子栋熊春陈四国丁炜柳晓李晓媛王晓培李莉
Owner CHONGQING UNIV
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