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Durable super-hydrophobic gas diffusion layer for fuel cell

A gas diffusion layer and fuel cell technology, which is applied to fuel cell parts, electrolyte holding devices, etc., can solve the problems of decreased mass transfer performance and large internal resistance of polymers, and achieves improved hydrophobicity, uniform pores, and air permeability. good performance

Inactive Publication Date: 2018-09-18
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Covering the surface of the microporous layer with a polymer layer improves the surface smoothness of the microporous layer to a certain extent, but the internal resistance of the polymer is large, resulting in a decrease in mass transfer performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) The conductive porous substrate was immersed in acetone, deionized water, and alcohol for ultrasonic cleaning, the ultrasonic power was 8kW, and the ultrasonic time was 10 minutes. Finally, it was rinsed with deionized water and dried in vacuum to obtain a clean conductive substrate. perforated porous substrates;

[0033] (2) Mix and stir the conductive agent, hydrophobic microspheres, and binder with a viscosity of 500cps in parts by mass of 3:1.2:15 at a stirring speed of 180 rpm to obtain a conductive coating;

[0034] (3) The clean conductive porous substrate is subjected to hydrophobic treatment, the conductive porous layer is conductive porous carbon fiber paper after hydrophobic treatment, and the conductive porous substrate is coated with polytetrafluoroethylene by soaking or spraying. After ethylene, use a heating rate of 10°C / min to raise the temperature to 289°C, pass through protective gas, and fire for 27 minutes to obtain a conductive porous layer with...

Embodiment 2

[0038] (1) The conductive porous substrate was immersed in acetone, deionized water, and alcohol for ultrasonic cleaning, with an ultrasonic power of 10kW and an ultrasonic time of 50 minutes, and finally rinsed with deionized water and dried in vacuum to obtain a clean conductive substrate. perforated porous substrates;

[0039] (2) Mix and stir the conductive agent, hydrophobic microspheres, and binder with a viscosity of 900 cps in parts by mass of 3:1.6:15 at a stirring speed of 170 rpm to obtain a conductive coating;

[0040] (3) The clean conductive porous substrate is subjected to hydrophobic treatment, the conductive porous layer is conductive porous carbon fiber non-woven fabric after hydrophobic treatment, and the conductive porous substrate is coated with Vinylidene, and then use a heating rate of 20°C / min to raise the temperature to 340°C, pass through protective gas, and fire for 29 minutes to obtain a conductive porous layer with a thickness of 1.5mm;

[0041] (...

Embodiment 3

[0044] (1) The conductive porous substrate was sequentially immersed in acetone, deionized water, and alcohol for ultrasonic cleaning. The ultrasonic power was 10kW, and the ultrasonic time was 45 minutes. Finally, it was rinsed with deionized water and dried in vacuum to obtain a clean conductive substrate. perforated porous substrates;

[0045] (2) Mix and stir the conductive agent, hydrophobic microspheres, and binder with a viscosity of 700 cps in parts by mass of 4:2:15 at a stirring speed of 80 rpm to obtain a conductive coating;

[0046] (3) The clean conductive porous substrate is subjected to hydrophobic treatment, the conductive porous layer is carbon felt after hydrophobic treatment, and the conductive porous substrate is coated with polytetrafluoroethylene- Perfluoroalkyl vinyl ether, and then use a heating rate of 8°C / min to raise the temperature to 320°C, pass through protective gas, and fire for 27 minutes to obtain a conductive porous layer with a thickness of ...

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Abstract

The invention provides a durable super-hydrophobic gas diffusion layer for fuel cell. The durable super-hydrophobic gas diffusion layer comprises a conductive porous base material and a micropore layer; the conductive porous base material is one of carbon fiber paper, carbon fiber non-woven cloth, carbon felt, a foamed metal plate and a metal net through the hydrophobic treatment; and the micropore layer contains the hydrophobic microsphere. The hydrophobic treatment is the conventional treatment method, such as soaking the conductive porous base material in the fluororesin, and then performing sintering treatment; the micropore layer is formed by coating the conductive paint on the conductive porous base material surface through scrap-coating and further performing the sintering treatment; the conductive paint is composed of conductive agent, hydrophobic microsphere and the adhesive, wherein the hydrophobic microsphere is the glass microsphere or polytetrafluoroethylene microsphere with high sphere degree. By adding the hydrophobic microsphere in the conductive paint, the hydrophobicity is improved, and the sphericity enables the micropore layer to be smooth, thereby effectively preventing a catalyst from immersing, and then the durability of the gas diffusion layer of the fuel cell is improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a durable super-hydrophobic gas diffusion layer for fuel cells. Background technique [0002] As a high-efficiency and environment-friendly power generation device, fuel cell has become a research and development hotspot in various countries in recent years. Its core component, the membrane electrode, is prepared by a gas diffusion layer, a catalytic layer and a proton exchange membrane through a hot pressing process. Among them, the gas diffusion layer is composed of conductive porous materials, which play multiple roles such as supporting the catalytic layer, collecting current, conducting gas and discharging water, and realizing the redistribution of reaction gas and product water between the flow field and the catalytic layer. One of the key components affecting electrode performance. The diffusion layer is usually composed of a base layer and a microporous layer. The ba...

Claims

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Application Information

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IPC IPC(8): H01M8/0289
CPCH01M8/0289Y02E60/50
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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