Method for preparing efficient stable fuel cell catalyst

A fuel cell and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve the problems of low catalyst performance and poor stability, achieve high specific surface area, avoid corrosion, and improve stability. Effect

Active Publication Date: 2014-01-08
重庆铈坦新材料技术研究院有限公司
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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 highly efficient and stable fuel cell catalyst p

Method used

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  • Method for preparing efficient stable fuel cell catalyst
  • Method for preparing efficient stable fuel cell catalyst
  • Method for preparing efficient stable fuel cell catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) In situ synthesis of polyaniline modified Pt / C catalyst

[0031] Weigh the Pt / C catalyst and aniline according to the mass ratio of Pt / C catalyst: aniline as 1:1, and weigh according to the mass ratio of aniline: iron precursor: cobalt precursor: ammonium persulfate as 1:4:0.7:3 Ferric chloride, cobalt nitrate and ammonium persulfate; first add aniline monomer to 0.5 mol / L sulfuric acid aqueous solution, after ultrasonic stirring for 20 minutes, add Pt / C catalyst, continue ultrasonic stirring for 24 hours, wait for the Pt / C catalyst to disperse After uniformity, slowly add ammonium persulfate, ferric chloride and cobalt nitrate dissolved in 0.5mol / L sulfuric acid aqueous solution into the mixed solution of Pt / C catalyst and aniline under the condition of stirring at 0°C, and the dropping time is controlled at After 30 minutes, after the dropwise addition was completed, the reaction was continued for 24 hours under the condition of stirring at 0° C.; then the product...

Embodiment 2

[0042] (1) In situ synthesis of polyaniline modified Pt / C catalyst

[0043] Weigh the Pt / C catalyst and aniline according to the mass ratio of Pt / C catalyst: aniline as 1:0.7, and weigh according to the mass ratio of aniline: iron precursor: cobalt precursor: ammonium persulfate as 1:6:1:1 Ferric nitrate, cobalt chloride and ammonium persulfate; first add aniline monomer to 0 mol / L sulfuric acid aqueous solution, after ultrasonic stirring for 10 minutes, add Pt / C catalyst, continue ultrasonic stirring for 10 hours, wait for the Pt / C catalyst to disperse After uniformity, ammonium persulfate, ferric nitrate and cobalt chloride dissolved in 0 mol / L sulfuric acid aqueous solution were slowly added dropwise to the mixed solution of Pt / C catalyst and aniline under the condition of stirring at 15°C, and the dropping time was controlled at After 5 minutes, after the dropwise addition was completed, the reaction was continued for 10 hours under stirring at 15° C.; then the product was...

Embodiment 3

[0050] (1) In situ synthesis of polyaniline modified Pt / C catalyst

[0051] Weigh the Pt / C catalyst and aniline according to the mass ratio of Pt / C catalyst: aniline as 1:1.5, and weigh according to the mass ratio of aniline: iron precursor: cobalt precursor: ammonium persulfate as 1:2:0.5:4 Iron sulfate, cobalt sulfate and ammonium persulfate; first add aniline monomer to 1.5 mol / L sulfuric acid aqueous solution, after ultrasonic stirring for 30 minutes, add Pt / C catalyst, continue ultrasonic stirring for 28 hours, until the Pt / C catalyst is uniformly dispersed Finally, under the condition of stirring at 10°C, ammonium persulfate, iron sulfate and cobalt sulfate dissolved in 1.5 mol / L sulfuric acid aqueous solution were slowly added dropwise to the mixed solution of Pt / C catalyst and aniline, and the dropping time was controlled at 60 minutes. After the dropwise addition, the reaction was continued for 48 hours under stirring at 10° C.; then the product was dried and ground t...

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Abstract

The invention provides a method for preparing an efficient stable fuel cell catalyst and aims to solve the defect that an existing fuel cell catalyst is low in property and poor in stability. The method provided by the invention is characterized in that polyaniline covers the surface of a Pt/C catalyst through using an in-situ chemical oxidation polymerization method, and further an N-doped carbon layer is formed under transition metal salt catalysis through high-temperature pyrolysis; on one hand, the formed N-doped carbon layer is utilized as a second active centre and can strengthen the catalytic activity with Pt synergism, on the other hand, the migration and birdnesting growth of Pt nano particles on the surface of a carbon support are effectively blocked, and the stability of a catalyst is improved; in addition, the nanometer limited range action of the polyaniline can effectively restrain the sintering growth of the Pt nano particles on the surface of the carbon support in the high-temperature processing process, and the high activity specific surface area of a final catalyst is guaranteed; the oxygen reduction activity and the stability of the prepared Pt/C catalyst modified by the N-doped carbon layer are remarkably better than those of a commercialization Pt/C catalyst.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a method for preparing a fuel cell catalyst with high efficiency and stability. Background technique [0002] A fuel cell is a device that can directly convert chemical energy into electrical energy with outstanding features such as high energy conversion efficiency, environmental friendliness, rapid start-up at room temperature, high specific power and specific energy, and is considered to be the most promising solution for electric vehicles and other civilian applications in the future. Hopeful chemical power source, however, the high cost has been the core problem that plagues the commercialization of fuel cells. At present, the main reason for the high cost of fuel cells is the extensive use of precious metal Pt, so it has become more urgent to get rid of resource constraints such as precious metal Pt and reduce the cost of fuel cells. In order to reduce costs...

Claims

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Application Information

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IPC IPC(8): B01J27/24H01M4/92
CPCY02E60/50
Inventor 魏子栋聂瑶陈四国丁炜谢小红
Owner 重庆铈坦新材料技术研究院有限公司
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