Preparation method of low-platinum catalytic layer for proton exchange membrane fuel cell

A proton exchange membrane, fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as unfavorable mass transfer, inability to ensure uniformity, poor battery performance, etc., and achieve good pore structure, which is conducive to gas mass transfer. , the effect of large porosity

Inactive Publication Date: 2016-06-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The disadvantages of the traditional preparation method: the carbon-supported catalyst and the electrolyte components are randomly mixed, and their uniformity cannot be guaranteed, and the three-phase interface of protons, electrons, and gases cannot be effectively constructed. The pores of the catalytic layer are relatively dense, which is not conducive to mass transfer, and the low Battery performance is poor when loaded

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  • Preparation method of low-platinum catalytic layer for proton exchange membrane fuel cell
  • Preparation method of low-platinum catalytic layer for proton exchange membrane fuel cell
  • Preparation method of low-platinum catalytic layer for proton exchange membrane fuel cell

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[0027] The present invention will be further described below in conjunction with example

[0028] Weigh 1 g of polymer polymer, dissolve and mix 6 g of isopropanol and 1 g of water, and stir for 24 hours to prepare a 12.5% ​​solution. Weigh 0.1g of 40% P / C catalyst, 0.6g of Nafion solution (5%), mix well, add 0.2g of polymer solution after ultrasonic for a while, and stir for 36h. Then adopt the electrospinning technique to prepare the catalytic layer, the condition parameters are: the liquid flow rate is 0.8mlh -1 , the distance between the needle tip and the receiving plate was 10cm, and the voltage was 10kV. By controlling different receiving times, the catalytic layers with different Pt loadings were prepared. Finally, transfer the prepared catalytic layer to the surface of Nafion with hot pressing at 140°C, hot pressing pressure 0-2Mpa, and hot pressing time 2-4min to prepare a single-sided membrane electrode. The anode uses a commercial gas diffusion electrode , the el...

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Abstract

The invention discloses a preparation method for a low-platinum catalytic layer for a proton exchange membrane fuel cell. In the catalytic layer, a low-loading Pt / C-Nafion catalytic layer is directly prepared by an electrospinning technology, a binding agent can be selected from a macromolecule polymer such as poly acrylic acid (PAA) and poly vinyl alcohol (PVA), the thickness of the binding agent is 1-4 micrometers. The maximum power density of a single battery with the negative electrode loading being 0.2mg cm<-2> of the catalytic layer prepared by electrospinning, and is superior to that of a commercial gas diffusion electrode with the negative electrode loading being 0.5mg cm<-2>; and moreover, when the negative electrode loading is reduced to 0.056mg cm<-2>, the maximum power density of the single battery is still 561mw cm<-2>.

Description

technical field [0001] The invention belongs to the field of fuel cells, and relates to a method for preparing a catalytic layer of a proton exchange membrane fuel cell with a low platinum loading. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high power density, high energy conversion efficiency, low temperature start-up, and environmental friendliness, and is considered as an ideal power source for stationary power stations, electric vehicles, and portable power sources. Then, if it wants to be successfully commercialized, it mainly faces two problems-cost and lifespan. In fuel cell components, the cost of catalyst accounts for nearly half, and reducing the Pt loading is the most direct way to reduce the cost of fuel cells. Therefore, optimizing the electrode preparation process and making low-platinum catalysts have higher catalytic performance is an urgent task in the research of low-temperature fuel cells. It has extreme...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92
CPCY02E60/50
Inventor 侯明洪绍景穆聪梁栋邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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