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A modular spraying method for preparing fuel cell membrane electrodes by ultrasonic spraying

A fuel cell membrane and ultrasonic spraying technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem that compatibility and preparation adaptability are difficult to meet mass production, membrane electrode production efficiency is difficult to ensure product consistency, and catalyst materials are wasted. Large and other problems, to achieve the effect of high material utilization, reduced loss, and fast coating rate

Active Publication Date: 2019-04-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large difference between the structure and components of the catalytic layer and the polymer electrolyte membrane, its compatibility and preparation adaptability are often difficult to meet the needs of mass production. The swelling and shrinkage of the membrane makes the production efficiency of the membrane electrode and Product consistency is difficult to guarantee
In addition, the fuel cell membrane electrode needs to be sealed during the stack assembly process, and it is necessary to prepare blank edges during the preparation process of the CCM structure electrode, which also makes the traditional coating method waste a lot of expensive catalyst materials, making it difficult to Realize large-scale mass production

Method used

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  • A modular spraying method for preparing fuel cell membrane electrodes by ultrasonic spraying
  • A modular spraying method for preparing fuel cell membrane electrodes by ultrasonic spraying
  • A modular spraying method for preparing fuel cell membrane electrodes by ultrasonic spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a. Preparation of spraying mold:

[0025] According to the requirement of membrane electrode size for DMFC25W stack assembly, the stainless steel mold size is designed and prepared to be 8.1*6.2*3cm, and a hole array with a diameter of 2mm is prepared on the mold for vacuum adsorption. According to the size of the ultrasonic spraying abutment, the above-mentioned molds are arranged in a 3*3 array, and a frame of the same thickness is prepared on the outside for fixing. The gap distance between each mold is about 1mm.

[0026] b. Preparation of CCM structure membrane electrode:

[0027] Cut the pre-treated dry Nafion115 film according to requirements and fix it on the mold. A vacuum hot stage is connected under the mold with a temperature of 40 degrees Celsius, and a vacuum pump is used to adsorb the polymer electrolyte membrane on the surface of the mold. Ultrasonic spraying uses a commercial ultrasonic spraying device. The catalyst slurry component is Pt / C (60wt.%)...

Embodiment 2

[0033] a. Preparation of spraying mold:

[0034] According to the requirement of membrane electrode size for DMFC25W stack assembly, the stainless steel mold size is designed and prepared to be 8.1*6.2*3cm, and a hole array with a diameter of 2mm is prepared on the mold for vacuum adsorption. According to the size of the ultrasonic spraying abutment, the above-mentioned molds are arranged in a 3*3 array, and a frame of the same thickness is prepared on the outside for fixing. The gap distance between each mold is about 1mm.

[0035] b. Preparation of CCM structure membrane electrode:

[0036] Cut the pre-treated dry Nafion115 film according to requirements and fix it on the mold. A vacuum hot stage is connected under the mold with a temperature of 40 degrees Celsius, and a vacuum pump is used to adsorb the polymer electrolyte membrane on the surface of the mold. Ultrasonic spraying uses a commercial ultrasonic spraying device. The catalyst slurry component is PtRu / C (75wt....

Embodiment 3

[0038] a. Preparation of spraying mold:

[0039] According to the requirement of membrane electrode size for RHFC 3kW stack assembly, the stainless steel mold size is designed and prepared with a size of 10*10*3cm, and a hole array with a diameter of 2mm is prepared on the mold for vacuum adsorption. According to the size of the ultrasonic spraying abutment, the above-mentioned molds are arranged in a 3*3 array, and a frame of the same thickness is prepared on the outside for fixing. The gap distance between each mold is about 1mm.

[0040] b. Preparation of CCM structure membrane electrode:

[0041]Cut the pre-treated dry PBI film according to requirements and fix it on the mold. A vacuum hot stage is connected under the mold with a temperature of 60 degrees Celsius, and a vacuum pump is used to adsorb the polymer electrolyte membrane on the surface of the mold. Ultrasonic spraying uses a commercial ultrasonic spraying device. The catalyst slurry component is PtCo / C (60wt...

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Abstract

A modular spraying method for preparing a fuel cell membrane electrode by ultrasonic spraying, comprising the following steps: a. Preparation of a modular spraying mold: According to the requirements of the fuel cell stack assembly for the membrane electrode size, design and prepare a rectangular flat mold, and A through hole is prepared between the upper and lower surfaces of the flat mold; on the abutment, a rectangular ring frame with the same height as the mold is arranged on the outside of the mold arranged in an N*M array; b. CCM structure membrane electrode preparation: the pretreated The dry polymer electrolyte membrane is cut according to the requirements, and the bottom of the mold is attached to the ultrasonic sprayed abutment, and the abutment is vacuumed and heated; the slurry containing the catalyst is sprayed on the surface of the polymer electrolyte membrane; to be coated on the required catalyst support After measuring, the prepared CCM was removed from the mold for subsequent membrane electrode assembly steps. Compared with the prior art, the invention has the advantages of good coating uniformity, fast coating speed, high material utilization rate and the like.

Description

technical field [0001] The invention relates to a modular spraying device for preparing fuel cell membrane electrodes by ultrasonic spraying, in particular to a method for realizing the coating of a catalytic layer on the surface of a proton exchange membrane by adopting a novel process of ultrasonic dispersion coating. The method is simple, efficient and has high catalyst utilization rate, and is suitable for various fuel cell systems including polymer electrolyte membranes. Background technique [0002] Polymer electrolyte membrane fuel cells, as a clean alternative electric energy technology in the future, have extremely broad application prospects in many fields such as transportation, electronic products, and stationary power stations. Especially in recent years, industrial giants such as Toyota have successively released fuel cell-related products, which is bound to set off a wave of mass production of fuel cells in the future. At the same time, a variety of fuel cell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88
CPCH01M4/8828H01M4/8892Y02E60/50
Inventor 孙公权夏章讯王素力景粉宁
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI