Membrane electrode of gradient proton exchange membrane fuel cell as well as preparation method and application of membrane electrode

A proton exchange membrane, fuel cell membrane technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of catalyst waste, uneven distribution of catalytic layers, poor utilization, etc., to increase gas transmission channels and reduce interface effects. , the effect of reducing contact resistance

Active Publication Date: 2022-01-28
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the porous material structure, the membrane electrode prepared by it has a large interface effect, and the distribution of gas in the catalytic layer is not uniform. The uniform distribution of platinum catalyst will cause waste of catalyst in the catalytic layer and reduce the utilization of platinum catalyst. Rate
[0005] The above schemes all have problems such as low platinum catalytic efficiency, poor utilization rate, high preparation cost, or uneven gas distribution. Therefore, it is necessary to develop a proton exchange membrane fuel cell membrane electrode with high platinum catalytic efficiency and low cost.

Method used

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  • Membrane electrode of gradient proton exchange membrane fuel cell as well as preparation method and application of membrane electrode
  • Membrane electrode of gradient proton exchange membrane fuel cell as well as preparation method and application of membrane electrode

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Embodiment 1

[0068] This embodiment provides a gradient proton exchange membrane fuel cell membrane electrode, comprising the following steps:

[0069] Anode catalyst slurry:

[0070] (a) Prepare the first layer of catalyst slurry, take by weighing 100mg of platinum-carbon catalyst with a platinum content of 30%, add 25g of deionized water, then add dropwise the solution containing 35mg of ionomer (concentration is 3%, EW value is 800) For the ionomer solution, make carbon: polymer = 1:0.5, add 28 g of isopropanol dropwise after ultrasonication in an ice bath, and mix evenly with ultrasonication in an ice bath. Use a high-speed emulsifying shearing machine to carry out strong dispersion for 40 minutes to obtain the catalyst ink to be sprayed, and the dispersion speed is 20000r / min. Wherein the percentage of platinum in the slurry solid content is 22.2%.

[0071] (b) Prepare the second layer of catalyst slurry, take by weighing 100mg of platinum-carbon catalyst with a platinum content of ...

Embodiment 2

[0078] This embodiment provides a gradient proton exchange membrane fuel cell membrane electrode, comprising the following steps:

[0079] Anode catalyst slurry:

[0080](a) Prepare the first layer of catalyst slurry, take by weighing 100mg of platinum-carbon catalyst with a platinum content of 20%, add 25g of deionized water, then add dropwise the solution containing 96mg of ionomer (concentration is 1%, EW value is 900) For the ionomer solution, make carbon: polymer = 1:1.2, add 28 g of isopropanol dropwise after ultrasonication in an ice bath, and mix evenly with ultrasonication in an ice bath. Use a high-speed emulsifying shearing machine to carry out strong dispersion for 40 minutes to obtain the catalyst ink to be sprayed, and the dispersion speed is 20000r / min. Wherein the percentage of platinum in the slurry solid content is 10.2%.

[0081] (b) prepare the second layer of catalyst slurry, take by weighing 100mg of platinum-carbon catalyst with a platinum content of 3...

Embodiment 3

[0088] This embodiment provides a gradient proton exchange membrane fuel cell membrane electrode, the specific preparation method is as follows:

[0089] Anode catalyst slurry:

[0090] (a) Prepare the first layer of catalyst slurry, take 25mg of platinum-carbon catalyst with a platinum content of 30%, add 25g of deionized water, and then add 24.5mg of ionomer dropwise (concentration is 20%, EW value is 820) For the ionomer solution, make carbon:polymer = 1:1.4, add 28g of isopropanol dropwise after ultrasonication in an ice bath, and mix evenly with ultrasonication in an ice bath. Use a high-speed emulsifying shearing machine to carry out strong dispersion for 40 minutes to obtain the catalyst ink to be sprayed, and the dispersion speed is 20000r / min. The percentage of platinum in the slurry solid content is 15.2%

[0091] (b) prepare the second layer of catalyst slurry, take by weighing 25mg of platinum-carbon catalyst with a platinum content of 20%, add 25g of deionized w...

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Abstract

The invention provides a gradient proton exchange membrane fuel cell membrane electrode as well as a preparation method and application thereof. The gradient proton exchange membrane fuel cell membrane electrode comprises a cathode catalyst layer and an anode catalyst layer, the cathode catalyst layer comprises a first catalyst layer, a second catalyst layer and a third catalyst layer, and the slurry of the third catalyst layer contains a carbon nanomaterial; the anode catalyst layer comprises a first catalyst layer and a second catalyst layer. According to the gradient proton exchange membrane fuel cell membrane electrode, gradient design is carried out on the catalyst layers, the mass fraction of platinum, the mass fraction of ionomer and the EW value in the cathode catalyst layer and the anode catalyst layer are distributed in a segmented mode, the utilization rate of platinum is increased, the content of platinum is reduced, the electrode is suitable for low-humidity and high-current-density working conditions, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a gradient proton exchange membrane fuel cell membrane electrode and a preparation method and application thereof. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are considered as ideal power sources for electric vehicles due to their high power density and energy conversion efficiency, ability to start at low temperatures, and environmental friendliness. However, in order to be commercialized, it is first necessary to solve the problems of cost and performance. The core component of a proton exchange membrane fuel cell is a membrane electrode, which is mainly composed of a gas diffusion layer, a proton exchange membrane, and a catalytic layer. Among them, in the catalytic layer, reducing the amount of platinum and improving the utilization rate of the platinum catalyst are crucial to reducing the cost of the fuel cell. The catalyst in the catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/92H01M8/1004
CPCH01M4/8642H01M4/92H01M8/1004H01M4/8828Y02E60/50Y02P70/50
Inventor 唐柳朱雅男于力娜张克金杨帅苗梓航
Owner FAW JIEFANG AUTOMOTIVE CO
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