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Method for improving stability of fuel cell catalyst and utilization rate of catalyst

A fuel cell and catalyst technology, which is applied to fuel cell additives, battery electrodes, circuits, etc., can solve the problems of low catalyst utilization rate and poor catalyst stability, and achieve the effects of excellent oxygen permeability, oxidation resistance and low production cost.

Inactive Publication Date: 2011-04-20
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 improving fuel cell catalyst stability and catalyst utilization for the shortcomings of existing Pt / C catalysts with poor stability and low catalyst utilization

Method used

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  • Method for improving stability of fuel cell catalyst and utilization rate of catalyst
  • Method for improving stability of fuel cell catalyst and utilization rate of catalyst
  • Method for improving stability of fuel cell catalyst and utilization rate of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Functional treatment of carbon support

[0033] Weigh 1 gram of commercially available Vulcan XC-72 carbon powder, add 150 milliliters of 30% hydrogen peroxide and concentrated sulfuric acid mixed solution with a volume ratio of 1:4, ultrasonically vibrate and stir for 3 hours, dilute with ultrapure water, and statically After standing for 24 hours, the supernatant was filtered out, washed by centrifugation for several times, dried, and ground to obtain a functionalized carbon carrier.

[0034] (2), preparation of Pt / C catalyst

[0035] According to functionalized Vulcan XC-72 carbon powder: the mass ratio of chloroplatinic acid is 1: 1 to take functionalized Vulcan XC-72 carbon powder and chloroplatinic acid, and use ethylene glycol as a solvent to vibrate evenly under ultrasonic conditions, Then, under the protection of nitrogen or argon atmosphere, stirred and refluxed at 140°C for 3 hours, cooled to room temperature, washed the product by centrifugation, dried,...

Embodiment 2

[0041] (3) In situ synthesis of polyaniline modified Pt / C catalyst

[0042] By Pt / C catalyst: the mass ratio of aniline is 1: 1 to take by weighing Pt / C catalyst and aniline, by aniline: the mol ratio of ammonium persulfate is 1: 1 to weigh ammonium persulfate; Add aniline to the aqueous solution, and after ultrasonic stirring for 10 minutes, add the Pt / C catalyst prepared in step (2), and continue ultrasonic stirring for 2 hours. The ammonium persulfate in the hydrochloric acid aqueous solution at 0 is slowly added dropwise to the mixed solution of the Pt / C catalyst and aniline, and the dropping time is controlled at 10 minutes. After the dropping is completed, the reaction is continued for 5 hours under stirring at 25°C; Then the product is centrifugally washed, dried, and ground to obtain a polyaniline-modified Pt / C catalyst.

[0043] (4) Stability test of polyaniline modified Pt / C catalyst

[0044] Weigh 2 mg of the polyaniline-modified Pt / C catalyst prepared in step (3)...

Embodiment 3

[0046] (3) In situ synthesis of polyaniline modified Pt / C catalyst

[0047] By Pt / C catalyst: the mass ratio of aniline is 1: 0.1 to take by weighing Pt / C catalyst and aniline, by aniline: the molar ratio of ammonium persulfate is 1: 1.25 to take by weighing ammonium persulfate; Add aniline to the aqueous solution of chloric acid, and after ultrasonic stirring for 30 minutes, add the Pt / C catalyst prepared in step (2), and continue ultrasonic stirring for 1 hour. The ammonium persulfate in the perchloric acid aqueous solution with a pH value of 0 is slowly added dropwise to the mixed solution of Pt / C catalyst and aniline, and the dropping time is controlled at 30 minutes. React for 24 hours; then the product is centrifugally washed, dried, and ground to obtain a polyaniline-modified Pt / C catalyst.

[0048] (4) Oxygen Reduction Performance Test of Polyaniline Modified Pt / C Catalyst on Rotating Disk Electrode

[0049] Weigh 2 mg of the polyaniline-modified Pt / C catalyst prepar...

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Abstract

The invention provides a method for improving the stability of a fuel cell catalyst and the utilization rate of the catalyst, which belongs to the technical field of fuel cells. A layer of conductive polyaniline with conjugated large pai bond structure is modified on the carbon surface of a Pt / C (platinum / carbon) catalyst through the in-situ chemical oxidation polymerization method, on the one hand, migration, aggregation and growth of Pt nano-particles on the surface of a carbon carrier can be prevented by utilizing strong interaction between polyaniline and the Pt nano-particles, and the stability of the catalyst can be further improved; on the other hand, the polyaniline is an excellent proton-electron conductor and simultaneously has excellent oxygen permeability, by covering the polyaniline on the carbon carrier, the probability of exposing the Pt nano-particles on a three-phase reaction interface of the fuel cell can be increased, and the utilization rate of the catalyst can be further improved. The method is simple and easy for operation, the production cost is low, and the catalyst prepared by adopting the invention can be applied in the fuel cells taking proton exchange membranes as electrolytes. The fuel cells manufactured by using the invention can be widely applied in electric vehicles, various spacecrafts, portable electronic equipment such as cameras, notebook computers, electric toys and the like.

Description

1. Technical field: [0001] The invention belongs to the technical field of fuel cells, in particular to a method for improving the stability and catalyst utilization rate of fuel cell catalysts. 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. At present, the main reason for the high cost of fuel cells is the extensive use of the noble metal Pt. Due to the high price of Pt and the lack of resources, in the absence of a non-noble metal catalyst with catalytic performance comparable to that of Pt, it is necessary to reduce the amount of Pt. Improving the utilization of Pt has become more ...

Claims

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Application Information

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IPC IPC(8): H01M8/04H01M4/88H01M4/90
CPCY02E60/50
Inventor 魏子栋陈四国李莉齐学强张骞丁炜郭琳
Owner CHONGQING UNIV
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