Fuel cell cathode catalyst with high stability suitable for dynamic conditions

A high-stability technology for fuel cell cathodes, applied in battery electrodes, catalyst carriers, physical/chemical process catalysts, etc., can solve the problems of low catalyst stability and achieve suitable for large-scale production, high catalyst stability, and conditions easy effect

Inactive Publication Date: 2011-06-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So as to solve the problem of low stability of fuel cell catalysts

Method used

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  • Fuel cell cathode catalyst with high stability suitable for dynamic conditions
  • Fuel cell cathode catalyst with high stability suitable for dynamic conditions
  • Fuel cell cathode catalyst with high stability suitable for dynamic conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mix the raw material MWNTs (diameter: 8nm) with concentrated nitric acid (65-68%) at a ratio of 1g:100mL, treat with ultrasonic waves for 15min, then reflux at 120°C for 4h, cool to room temperature, filter, and wash the solid with distilled water several times To neutral, dry overnight at 80°C in a vacuum oven.

[0037] The carbon nanotube-supported platinum catalyst was prepared by intermittent microwave heating method, specifically: firstly, the treated MWNTs and ethylene glycol were mixed and ultrasonically stirred until uniform, and then an appropriate amount of H 2 PtCl 6The solution was ultrasonically stirred, and finally the pH value was adjusted to pH>12 with NaOH in ethylene glycol solution. Then heat it in a household microwave oven, cool it to room temperature, add dilute hydrochloric acid to adjust the pH value to pH<2, and after centrifugal washing to no chloride ion, vacuum dry it in a vacuum oven at 80°C overnight. The loading of Pt was 20%.

[0038] ...

Embodiment 2

[0040] Mix the raw material MWNTs (diameter: 10-20nm) with concentrated nitric acid (65-68%) at a ratio of 1g:100mL, treat with ultrasonic waves for 15min, then reflux at 120°C for 4h, cool to room temperature, filter, and wash the solid with distilled water Multiple times to neutral, dry overnight at 80°C in a vacuum oven.

[0041] The carbon nanotube-supported platinum catalyst was prepared by intermittent microwave heating method, specifically: firstly, the treated MWNTs and ethylene glycol were mixed and ultrasonically stirred until uniform, and then an appropriate amount of H 2 PtCl 6 The solution was ultrasonically stirred, and finally the pH value was adjusted to pH>12 with NaOH in ethylene glycol solution. Then heat it in a household microwave oven, cool it to room temperature, add dilute hydrochloric acid to adjust the pH value to pH figure 2 , 5 It is the CV and ORR diagrams before and after 300 scans of the catalyst prepared from the treated carbon nanotubes in th...

Embodiment 3

[0043] Mix the raw material MWNTs (diameter: 30-50nm) with concentrated nitric acid (65-68%) at a ratio of 1g:100mL, treat with ultrasonic waves for 15min, then reflux at 120°C for 4h, cool to room temperature, filter, and wash the solid with distilled water Multiple times to neutral, dry overnight at 80°C in a vacuum oven.

[0044] The carbon nanotube-supported platinum catalyst was prepared by intermittent microwave heating method, specifically: firstly, the treated MWNTs and ethylene glycol were mixed and ultrasonically stirred until uniform, and then an appropriate amount of H 2 PtCl 6 The solution was ultrasonically stirred, and finally the pH value was adjusted to pH>12 with NaOH in ethylene glycol solution. Then heat it in a household microwave oven, cool it to room temperature, add dilute hydrochloric acid to adjust the pH value to pH image 3 , 6 It is the CV and ORR diagrams before and after 300 scans of the catalyst prepared from the treated carbon nanotubes in thi...

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Abstract

The invention discloses the technology of a fuel cell catalyst carrier with high stability suitable for dynamic conditions, and belongs to the technical field of fuel cells. A commercial carbon nanotube with the length of 0.5 to 15mu m and the diameter of 8 to 100nm is pretreated, and then active ingredients are supported on the pretreated carbon nanotube, wherein the content of the active ingredients is 0.5 to 90 percent, and the particle size of the active ingredients is 1 to 3nm. The prepared carbon nanotube-supported platinum catalyst has high stability and redox activity, wherein the stability and the redox activity of the catalyst prepared by taking the carbon nanotube with the length of 0.5 to 2mu m and the diameter of 10 to 20nm as the carrier are highest. The carrier can be applied as a carrier of a catalyst in a proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to a technology for improving the stability of catalysts in the fuel cell industry, in particular, selecting suitable carbon nanotubes for pretreatment as carriers to prepare catalysts. Background technique [0002] The lifetime of fuel cells is a key factor restricting their commercialization. Different applications have different requirements for the life of fuel cells, and there is still a considerable gap between the existing technical level and the indicators required for practical applications. The stability of materials, especially the stability of catalysts, is one of the most important factors affecting battery life, and the corrosion of catalyst supports is one of the factors affecting catalyst stability. The corrosion of the carbon support will lead to the detachment and loss of platinum particles, and aggravate the agglomeration and migration of platinum, thereby reducing the electrochemical surface area of ​​the cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/96H01M4/92H01M4/88B01J32/00B01J21/18B01J23/42B01J23/44B01J23/89
CPCY02E60/50
Inventor 邵志刚秦晓平周志敏孙立言
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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