Gas diffusion electrode, preparation method thereof and fuel cell
A gas diffusion electrode and coating technology, which is applied to fuel cell type half cells and primary cell type half cells, battery electrodes, circuits, etc. The effect of increasing service life and improving performance
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[0046] Based on the above purpose, the present invention also proposes a method for preparing a gas diffusion electrode as described above, the preparation method comprising the following steps:
[0047] Step S10, providing a base layer;
[0048] Step S20, setting a first microporous layer on the upper surface of the base layer;
[0049] Step S30, disposing a second microporous layer on the upper surface of the first microporous layer to obtain a gas diffusion electrode.
[0050] The present invention does not limit the specific preparation steps of the base layer, which can be prepared by a conventional method. In order to make the hydrophobicity of the prepared gas diffusion layer better, in this embodiment, step S10 includes:
[0051] S11. Ultrasonic cleaning the base material for 30-60 minutes, and then drying at 40-90° C.;
[0052] S12, coating the hydrophobic polymer dispersion on the dried base material, and then drying at 40-90°C to obtain an intermediate;
[0053] ...
Embodiment 1
[0088] (1) Put Toray 060 hydrophobic carbon paper (the thickness of this type of carbon paper is 0.19mm) in absolute ethanol and ultrasonically clean it for 30 minutes, and then dry it at 50°C. The mass fraction is 60wt%) and diluted to 30wt%, then soak the dried carbon paper in the diluted PTFE dispersion, take it out after ultrasonication for 15min, and then blow it with nitrogen at 60°C until it is completely dry to obtain the intermediate, The corresponding covering steps were repeated until the mass fraction of the hydrophobic polymer in the intermediate was 15%, and finally the intermediate was sintered at 200° C. for 30 min to obtain a hydrophobically modified base layer.
[0089] (2) Grind the carbon material (10.0g acetylene black, 4.0g high-temperature reduced graphene and 2.0g high-temperature reduced flake graphite) through a mortar and a 500-3000 mesh sieve to obtain carbon powder. Add carbon powder into 400mL of n-propanol, and use a high-speed shearing machine t...
Embodiment 2
[0094] (1) Place the carbon felt in absolute ethanol for ultrasonic cleaning for 60 minutes, then dry it at 90°C, and dilute the polyvinylidene fluoride (PVDF) dispersion (the mass fraction of PVDF is 50%) to 25% by mass , uniformly covered on the dried carbon felt by impregnation, and then heated and dried at 40°C to obtain an intermediate, and repeated the corresponding covering steps until the mass fraction of the hydrophobic polymer in the intermediate was 5%, and finally the intermediate was sintered at 400° C. for 20 minutes to obtain a hydrophobically modified base layer.
[0095] (2) Grind the carbon material (5g of Vulcan XC-72, 8g of acetylene black and 7g of high-temperature reduced graphene) through a 500-3000 mesh sieve to obtain carbon powder, and add the carbon powder to 400mL of water several times under stirring , and performed multiple beating treatments with a high-speed shearing machine. After beating for 20 minutes, a carbon material slurry with a particle...
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Abstract
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