Fuel cell membrane electrode gas diffusion layer and its microporous layer preparation method and application

A gas diffusion layer, fuel cell membrane technology, applied in fuel cells, electrical components, coatings, etc., can solve the problems of complex experimental process, excessive dependence on fluoropolymers, high energy consumption, etc.

Active Publication Date: 2021-07-06
YOUON TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conventional microporous layers are generally composed of carbon materials and polytetrafluoroethylene (PTFE). By adjusting the ratio of PTFE and carbon materials in the microporous layer to adjust the hydrophobicity, conductivity and air permeability of the microporous layer, the preparation methods are mostly The high-temperature baking process consumes a lot of energy, the experimental process is complicated, and it relies too much on fluorine-containing polymers, and the preparation cost is also high

Method used

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  • Fuel cell membrane electrode gas diffusion layer and its microporous layer preparation method and application

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preparation example Construction

[0026] The invention provides a method for preparing a microporous layer of a gas diffusion layer of a fuel cell membrane electrode, comprising the following steps:

[0027] Dissolving organosiloxane, active monomer, photoinitiator, coupling agent and carbon material in an organic solvent according to a predetermined ratio, stirring and dispersing to form a uniformly mixed slurry;

[0028] Coating the slurry on one side of the hydrophobically treated support layer until the loading of carbon material is 0.5-3.0 mg / cm 2 , to obtain a support layer with slurry;

[0029] The support layer with the slurry is placed in an ultraviolet curing box for curing, and a microporous layer is formed on the support layer.

[0030] In a further embodiment, the slurry includes the following components: organosiloxane 10wt%-40wt%, active monomer 1wt%-2wt%, photoinitiator 0.1wt%-1wt%, coupling agent 0.5wt% -2.5wt%, carbon material 5wt%-20wt%, and the rest is solvent.

[0031] Among them, the o...

Embodiment 1

[0043] 1. Mix polydimethylsiloxane (organosiloxane, concentration 10wt%) 1g, 1, 6-hexanediol diacrylate (active monomer) 0.1g, diphenyltrimethylbenzoyl Phosphine oxide (photoinitiator) 0.01g, γ-methacryloxypropyltrimethoxysilane (coupling agent) 0.05g, carbon black (carbon material) 0.5g dissolved in 8.3g xylene (organic solvent) , stirring and dispersing to form a uniformly mixed slurry.

[0044] 2. Coat the slurry in step 1 on one side of the hydrophobically treated support layer by scraping, spraying or screen printing until the loading of carbon material is 1.0 mg / cm 2 .

[0045] 3. Place the sample in a UV curing box for curing, curing conditions: room temperature, UV wavelength 365nm, curing energy 1600mJ / cm 2 , the curing time is 1min, and the microporous layer of the gas diffusion layer is obtained.

Embodiment 2

[0047] 1. Mix polydimethylsiloxane (organosiloxane, concentration 10wt%) 1g, 1, 6-hexanediol diacrylate (active monomer) 0.1g, diphenyltrimethylbenzoyl Phosphine oxide (photoinitiator) 0.01g, γ-methacryloxypropyltrimethoxysilane (coupling agent) 0.05g, carbon black (carbon material) 1g dissolved in 7.8g xylene (organic solvent) , stirring and dispersing to form a uniformly mixed slurry.

[0048] 2. Coat the slurry in step 1 on one side of the hydrophobically treated support layer by scraping, spraying or screen printing until the loading of carbon material is 1.0 mg / cm 2 .

[0049] 3. Place the sample in a UV curing box for curing, curing conditions: room temperature, UV wavelength 365nm, curing energy 1600mJ / cm 2 , the curing time is 1min, and the microporous layer of the gas diffusion layer is obtained.

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Abstract

The invention discloses a fuel cell membrane electrode gas diffusion layer and a preparation method and application thereof, belonging to the field of fuel cells. The gas diffusion layer includes a support layer and a microporous layer; the preparation method of the microporous layer includes the following steps: dissolving organosiloxane, active monomer, photoinitiator, coupling agent and carbon material in a predetermined ratio In an organic solvent, stirring and dispersing to form a uniformly mixed slurry; coating the slurry on one side of the hydrophobically treated support layer until the loading amount of the carbon material is 0.5-3.0 mg / cm 2 , to obtain a support layer with slurry; placing the support layer with slurry in an ultraviolet curing box for curing, forming a microporous layer on the support layer. The invention prepares a uniform slurry by organosiloxane, active monomer, photoinitiator, coupling agent and carbon material, and adopts ultraviolet light curing technology to quickly cure the microporous layer of the gas diffusion layer. The process is simple and fast, and energy is saved. , to facilitate production.

Description

technical field [0001] The invention belongs to the field of fuel cells (H01M), in particular to a preparation method and application of a fuel cell membrane electrode gas diffusion layer and a microporous layer thereof. Background technique [0002] The Gas Diffusion Layer (GDL for short) is an important part of the fuel cell membrane electrode (Membrane Electrode Assembly, MEA for short). MPL) constitutes. Conventional microporous layers are generally composed of carbon materials and polytetrafluoroethylene (PTFE). By adjusting the ratio of PTFE and carbon materials in the microporous layer to adjust the hydrophobicity, conductivity and air permeability of the microporous layer, the preparation methods are mostly The high-temperature baking process consumes a lot of energy, the experimental process is complicated, and it relies too much on fluorine-containing polymers, and the preparation cost is also high. Contents of the invention [0003] In order to overcome the ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D4/06C09D4/02C09D7/63C09D7/61B05D3/06B05D7/24H01M8/0234H01M8/0243
CPCB05D3/067B05D7/24C09D4/06C09D7/61C09D7/63H01M8/0234H01M8/0243Y02E60/50Y02P70/50
Inventor 袁超乔军杰宁景霞
Owner YOUON TECH CO LTD
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