Method of transitional metal anchored platinum catalyst on carbon nano-tube

A carbon nanotube and platinum catalyst technology, applied in the field of fuel cells, can solve the problems of platinum-based catalyst stability and poor oxygen reduction activity, and achieve the effects of good catalyst stability, corrosion avoidance, and high oxygen reduction activity.

Inactive Publication Date: 2008-11-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for transition metal-anchored platinum catalysts on carbon nanotubes to address the shortcomings of existing platinum-based catalysts with poor stability and oxygen reduction activity

Method used

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  • Method of transitional metal anchored platinum catalyst on carbon nano-tube
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  • Method of transitional metal anchored platinum catalyst on carbon nano-tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1), purification of carbon nanotubes

[0035] Weigh 1g of commercially available carbon nanotubes (Shenzhen Bill Technology Co., Ltd.), add 160ml of concentrated nitric acid, heat and reflux for 3 hours, cool, dilute with ultrapure water, filter out the supernatant, wash centrifugally several times, dry, and grind to obtain Purified carbon nanotubes.

[0036] (2) Functionalization of carbon nanotubes

[0037] Weigh 1 g of purified carbon nanotubes, add 100 ml of 30% hydrogen peroxide and concentrated sulfuric acid mixed acid with a volume ratio of 1:4, stir with ultrasonic vibration for 3 hours, dilute with ultrapure water, and filter out the upper layer after standing for 24 hours The supernatant is washed by centrifugation several times, dried and ground to obtain functionalized carbon nanotubes.

[0038] (3) Preparation of nickel-anchored platinum catalyst on carbon nanotubes

[0039] According to functionalized carbon nanotubes: chloroplatinic acid: the mass rat...

Embodiment 2

[0045] Steps (1)-(2) are the same as steps (1)-(2) in Example 1.

[0046] (3) Preparation of nickel-anchored platinum catalyst on carbon nanotubes

[0047] According to the mass ratio of functionalized carbon nanotubes: potassium chloroplatinate: nickel chloride is 1: 2: 0.1, take functionalized carbon nanotubes, potassium chloroplatinate and nickel chloride, add to excess 1,5 - Add 30% potassium chloroplatinate, all functionalized carbon nanotubes and all nickel chloride to pentanediol solvent. Ultrasonic oscillation for 0.5 hours, then under the protection of nitrogen or argon atmosphere, stir and reflux in an oil bath at 250°C for 1 hour, then add the remaining 70% potassium chloroplatinate to the reflux device, and continue to stir and reflux under the above conditions Cool to room temperature after 3.5 hours. Then the product was centrifuged twice with 95% ethanol and ultrapure water, dried, and finally treated at 180° C. for 2 hours in a hydrogen atmosphere to obtain a...

Embodiment 3

[0049] Steps (1)-(2) are the same as steps (1)-(2) in Example 1.

[0050] (3) Preparation of iron-anchored platinum catalysts on carbon nanotubes

[0051] According to the mass ratio of functionalized carbon nanotubes: sodium chloroplatinate: ferric nitrate is 1: 1: 0.7, take functionalized carbon nanotubes, sodium chloroplatinate and ferric nitrate, add them to excess ethylene glycol solvent respectively Add 20% sodium chloroplatinate, all functionalized carbon nanotubes and all iron nitrate. Ultrasonic oscillation for 0.8 hours, then under the protection of nitrogen or argon atmosphere, stir and reflux in an oil bath at 180°C for 1.5 hours, then add the remaining 80% sodium chloroplatinate to the reflux device, and continue to stir and reflux under the above conditions Cool to room temperature after 2.5 hours. Then the product was centrifuged twice with 95% ethanol and ultrapure water, dried, and finally treated at 150° C. for 1.5 hours in a hydrogen atmosphere to obtain a...

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Abstract

The invention provides a method for an anchoring platinum catalyst of a transition metal on a carbon nanotube, which pertains to the technical field of fuel cells. The method purifies the carbon nanotube sold on a market by concentrated nitric acid and uses mixed acid of hydrogen peroxide and the concentrated nitric acid for treatment to obtain the functionalized carbon nanotube. And then the functionalized carbon nanotube, partial platinum salt and all transition metal M salt are stirred and reflow for certain time, added with rest platinum salt to continue to reflow, cooled, washed centrifugally, dried and carried out heating treatment in a hydrogen atmosphere, thus obtaining the anchoring platinum catalyst of the transition metal on the carbon nanotube. The anchoring platinum catalyst of the transition metal on the carbon nanotube prepared by the invention has extremely good stability and the catalytic activation of oxygen reduction and can substitute kindred commercialized catalysts.

Description

1. Technical field: [0001] The invention belongs to the technical field of fuel cells, in particular to a method for anchoring platinum catalysts on carbon nanotubes with transition metals. 2. Background technology: [0002] A proton exchange membrane fuel cell (PEMFC) is a device that directly converts chemical energy into electrical energy. It has outstanding features such as high energy conversion efficiency, environmental friendliness, low operating temperature, low-temperature quick start, long life, high specific power and specific energy, and is especially suitable for use as a mobile power source. hotspot. At present, due to the continuous advancement of technology, the trend of industrialization and commercialization is becoming more and more obvious. One of its key materials is the electrode catalyst, whose activity directly affects the performance of the battery. The noble metal platinum has excellent catalytic activity and has long been regarded as an ideal PE...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89H01M4/92
CPCY02E60/50
Inventor 魏子栋廖明佳季孟波陈四国李莉
Owner CHONGQING UNIV
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