Preparing method for high-activity and high-stability composite catalyst for fuel cells

A composite catalyst and high-stability technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., to achieve the effects of inhibiting migration and agglomeration growth, improving stability, and facilitating popularization and application

Active Publication Date: 2015-12-02
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 method for preparing a high-activity and high-stability fuel cell composite catalyst for the shortcomings of the existing traditional Pt-based alloy catalyst synthesis method

Method used

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  • Preparing method for high-activity and high-stability composite catalyst for fuel cells
  • Preparing method for high-activity and high-stability composite catalyst for fuel cells
  • Preparing method for high-activity and high-stability composite catalyst for fuel cells

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Embodiment 1

[0032] A method for preparing a high-activity and high-stability fuel cell composite catalyst, the specific method steps comprising:

[0033] (1) In situ polymerization of dopamine and adsorption of iron ions

[0034] First, the Pt / C catalyst and dopamine are weighed according to the mass ratio of the Pt / C catalyst and dopamine in the ratio of 1:0.7, and then the mixed solution with the volume ratio of ethanol and water of 1:1 is used as a solvent to control the concentration of the solution. The mass concentration of the Pt / C catalyst is 0.1 mg / ml, and the prepared solution is ultrasonicated for 10 minutes to uniformly disperse the Pt / C catalyst, and then the mass ratio of Tris-HCl to dopamine is 1:1. HCl buffer solution, stirred and polymerized at 30°C for 2 hours, centrifuged and washed the stirred sample with deionized water several times, then added ferric chloride according to the molar ratio of Pt and ferric chloride at 1:1, and stirred for 2 hours Make it fully absorb...

Embodiment 2

[0044] A method for preparing a high-activity and high-stability fuel cell composite catalyst, the specific method steps comprising:

[0045] (1) In situ polymerization of dopamine and adsorption of iron ions

[0046] First, weigh the Pt / C catalyst and dopamine according to the mass ratio of the Pt / C catalyst and dopamine in the ratio of 1:3, and then use the mixed solution with the volume ratio of ethanol and water as 1:3 as the solvent to control the concentration of the solution. Make the mass concentration of the Pt / C catalyst 0.1 mg / ml, ultrasonic the prepared solution for 60 minutes to uniformly disperse the Pt / C catalyst, then add Tris- HCl buffer solution, stirred and polymerized at 0°C for 2 hours, centrifuged and washed the stirred sample several times with deionized water, then added ferric nitrate according to the molar ratio of Pt and ferric nitrate at 1:1, and stirred for 2 hours to make it Fully absorb iron ions.

[0047] (2) Encapsulation and confinement of p...

Embodiment 3

[0054] A method for preparing a high-activity and high-stability fuel cell composite catalyst, the specific method steps comprising:

[0055] (1) In situ polymerization of dopamine and adsorption of cobalt ions

[0056] First, weigh the Pt / C catalyst and dopamine according to the mass ratio of the Pt / C catalyst and dopamine in the ratio of 1:3, and then use the mixed solution with the volume ratio of ethanol and water as 1:3 as the solvent to control the concentration of the solution. The mass concentration of the Pt / C catalyst is 2 mg / ml, and the prepared solution is ultrasonicated for 60 minutes to uniformly disperse the Pt / C catalyst, and then the mass ratio of Tris-HCl to dopamine is 1:3 by adding Tris- HCl buffer solution, stirred and polymerized at 30°C for 24 hours, centrifuged and washed the stirred sample several times with deionized water, then added cobalt nitrate according to the molar ratio of Pt and cobalt nitrate at 1:5, and stirred for 24 hours to make it Full...

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Abstract

The invention provides a preparing method for a high-activity and high-stability composite catalyst for fuel cells and belongs to the technical field of fuel cells. The preparing method includes the steps that firstly, the surface of a Pt / C catalyst is wrapped by a layer of dopamine, and the dopamine is used for adsorbing a metal precursor through the good adsorbing performance on metal cations; secondly, silicon dioxide is used for packaging a polymer, the pyrolysis losses and heat treatment morphology conversion of a polymer precursor are controlled through morphology fixing and range limiting functions of the silicon dioxide, alloy nano particles and an N-doped carbon modified layer are further synthesized through high-temperature pyrolysis under the surface segregation effect of platinum and transition metal, and the low-platinum-nonmetal composite structure catalyst with the hollow alloy nano particles wrapped by N-doped carbon is constructed. According to the preparing method for the high-activity and high-stability composite catalyst for the fuel cells, migration agglomerating and growing in the sintering process of the catalyst are overcome, the size of the particles is effectively controlled, the catalyst has high high-activity surface area, operation is simple, industrial production is easy, and the catalyst can be widely applied to the fuel cells with proton exchange membranes serving as electrolytes.

Description

Technical field: [0001] The invention belongs to the field of fuel cells, in particular to a method for preparing a high-activity and high-stability fuel cell composite catalyst. Background technique: [0002] A fuel cell is a device that directly converts chemical energy into electrical energy. It has outstanding features such as high energy conversion efficiency, environmental friendliness, rapid startup at room temperature, high specific power and specific energy, and is considered to be the most promising future for electric vehicles and other civilian applications. chemical power source. 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 noble metal Pt. Due to the high price of Pt and the lack of resources, it is necessary to reduce the amount of Pt and improve The utilization of Pt has become more urg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24H01M4/90H01M4/92
CPCY02E60/50
Inventor 魏子栋王青梅陈四国吴睿丁炜李莉
Owner 重庆铈坦新材料技术研究院有限公司
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