A microporous layer of a gas diffusion layer of a proton exchange membrane fuel cell and a preparation method thereof

A gas diffusion layer and proton exchange membrane technology, applied in fuel cells, electrical components, circuits, etc., can solve the problems of high heat treatment temperature and complicated treatment process, and achieve the effects of improving roughness, environmental friendliness, and mild reaction conditions

Active Publication Date: 2019-01-22
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

However, the heat treatment temperature of this method is rela

Method used

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  • A microporous layer of a gas diffusion layer of a proton exchange membrane fuel cell and a preparation method thereof
  • A microporous layer of a gas diffusion layer of a proton exchange membrane fuel cell and a preparation method thereof
  • A microporous layer of a gas diffusion layer of a proton exchange membrane fuel cell and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1

[0042] Dissolve polydimethylsiloxane and carbon black in tetrahydrofuran in a ratio of 1:1, mechanically stir, and ultrasonically form a uniform suspension (the concentration of polydimethylsiloxane is 3wt%). One side of the carbon paper is scraped and coated with the suspension until the loading of carbon black is 0.5mg / cm 2 , dried naturally, placed in a drying oven, and sintered at 160°C for 10min, the contact angle of the obtained gas diffusion layer was 152° (see Figure 5b ).

Example Embodiment

[0043] Example 2

[0044] Dissolve polydimethylsiloxane and carbon black in tetrahydrofuran in a ratio of 8:3, mechanically stir, and ultrasonically form a uniform suspension (the concentration of polydimethylsiloxane is 8wt%). One side of the carbon paper is scraped and coated with the suspension until the loading of carbon black is 0.5mg / cm 2 , dried naturally, placed in a drying oven, and sintered at 200°C for 20min, the contact angle of the obtained gas diffusion layer was 120.06°.

[0045]It can be seen from the above examples 1 and 2 that the content of polydimethylsiloxane has a certain proportion range. If it exceeds this optimum amount, the contact angle will gradually decrease instead, and the superhydrophobicity of the microporous layer cannot be realized.

Example Embodiment

[0046] Example 3

[0047] Dissolve polydimethylsiloxane and carbon black in tetrahydrofuran in a ratio of 2:3, mechanically stir, and ultrasonically form a uniform suspension (the concentration of polydimethylsiloxane is 2wt%). One side of the carbon paper is scraped and coated with the suspension until the loading of carbon black is 0.5mg / cm 2 , dried naturally, placed in a drying oven, and sintered at 160°C for 20min, the contact angle of the obtained gas diffusion layer was 148°.

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Abstract

The invention relates to a proton exchange membrane fuel cell, in particular to a gas diffusion layer microporous layer of the proton exchange membrane fuel cell and a preparation method thereof. After hydrophobic treatment, the surface of the support layer is scraped or sprayed with organic solvent containing organic siloxane and carbon nanomaterials, and the micro-porous layer of the gas diffusion layer of the proton exchange membrane fuel cell is formed through the micro-nano structure of the interface of the micro-porous layer and the coating layer. Among them, the dosage ratio of organosiloxane and carbon nanomaterials is 10% wt%-100wt%. The invention has the characteristics of simple treatment process, mild experimental conditions, friendly chemical environment and the like.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell, in particular to a microporous layer of a gas diffusion layer of a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a low-temperature fuel cell using proton exchange membrane as electrolyte, Pt / C as catalyst, hydrogen as fuel, and air or pure oxygen as oxidant. Considering the serious environmental pollution and energy problems, PEMFC has the advantages of high power density and environmental friendliness, making it a promising alternative to fossil fuels as energy resources for automatic, fixed and portable equipment. Membrane electrode (MEA) is a vital part of the proton exchange membrane fuel cell system, which includes proton exchange membrane, catalytic layer and gas diffusion layer (GDL). [0003] Schematic diagram of the structure of GDL (such as figure 1 ), the first layer connected to ...

Claims

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Application Information

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IPC IPC(8): H01M8/0258H01M8/1018H01M8/1069H01M8/1086
CPCH01M8/0258H01M8/1018H01M8/1069H01M8/1086Y02E60/50
Inventor 李晓锦孙燕
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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