Fuel cell leveling layer composition and preparation method thereof as well as gas diffusion layer

A fuel cell and leveling layer technology, which is used in fuel cells, fuel cell parts, solid electrolyte fuel cells, etc., can solve the difficulty of inferring and analyzing the pore size and pore distribution of the leveling layer, and is not conducive to the realization of a flat carbon paper surface. effect, not suitable for large-scale production and other problems, to achieve the effect of prolonging power generation efficiency, reducing mass migration, and improving microscopic state

Inactive Publication Date: 2009-09-23

HANERGY TECH

5 Cites 15 Cited by

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Problems solved by technology

[0005] Chinese patent CN1658422A discloses a fuel cell gas diffusion layer and its preparation method. In order to improve the air permeability of the leveling layer, an acid-soluble inorganic salt pore-forming agent is added in the preparation process, and in order to further increase the porosity and Pore diameter gradient, which adopts the method of multi-layer coating; the carbon powder slurry prepared by the above method has the same fluidity as ink, and the internal structure is loose. When it is directly coated on the carbon paper, it will penetrate into the interior of the carbon paper in large quantities, without It is ...

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Abstract

The invention discloses a fuel cell leveling layer composition and a preparation method thereof as well as a gas diffusion layer. The leveling layer composition comprises a conducting carbon material, an organic pore creating material, a water retention agent, a solvent and a hydrophobing agent, and the mass ratio of the conducting carbon material, the organic pore creating material, the water retention agent and the hydrophobing agent is 1:0.1 to 0.5:0.5 to 10:0.01 to 1. The leveling layer composition can effectively reduce the poriness on the surface of carbon paper, increase the mechanical strength of the gas diffusion layer and reduce the constriction resistance between a leveling layer and a catalyst layer, and the gas diffusion layer containing the leveling layer composition has higher surface smoothness, good ventilation property and water transmissibility, and no fine cracks.

Application Domain

Cell electrodesSolid electrolyte fuel cells +1

Technology Topic

SolventChemistry +11

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Examples

Experimental program(6)

Example Embodiment

[0033] Example 1

[0034] Take by weighing 10g of polyethylene oxide with a molecular weight of 400, dissolve it in 50g of absolute ethanol, and after stirring evenly, add 100g of carbon powder (produced by Cabot Company, VulcanXC-72R type) to it successively, and its particle diameter is 20nm and 50g Glycerol, after fully stirring, the mixed slurry was prepared, and the above mixed slurry was fully homogenized for 60 minutes at a shear rate of 6000r/min using a high-speed shear disperser (German IKAT25 type) to form a uniform viscous Thick slurry; then 20g of 5wt% PTFE emulsion was added thereto, and after ultrasonic dispersion for 30min, the leveling layer composition slurry was prepared.

[0035]The above-mentioned prepared slurry is coated on the surface of the hydrophobically treated carbon paper by automatic screen printing to obtain the gas diffusion layer of the present invention, such as figure 1 or figure 2 shown.

Example Embodiment

[0036] Example 2

[0037] Take by weighing 15g molecular weight is the polyvinyl alcohol of 1000, it is dissolved in 150g n-propanol, after stirring evenly, to wherein adding 30g microcrystalline graphite successively, its particle diameter is 30nm and 300g glycerol, after fully stirring, make To obtain the mixed slurry, use a high-speed shear disperser (IKAT25 type in Germany) to fully homogenize the above mixed slurry for 30 minutes at a shear rate of 10000r/min to form a uniform and thick slurry; then add After 60g of 5wt% PVDF emulsion was ultrasonically dispersed for 20 minutes, the leveling layer composition slurry was prepared.

[0038] The slurry prepared above is coated on the surface of the hydrophobically treated carbon cloth by means of automatic knife coating to prepare the gas diffusion layer of the present invention.

Example Embodiment

[0039] Example 3

[0040] Take by weighing 5g molecular weight is the polycarboxylic acid of 5000, it is dissolved in 500g isopropanol, after stirring evenly, to wherein adding 30g acetylene carbon black successively, its particle diameter is 40nm and 60g glycerol, after fully stirring, make Obtain mixed slurry, use high-speed shear disperser (German IKAT25 type) with above-mentioned mixed slurry under the shear rate of 24000r/min, fully homogeneous 200min, make it form uniform thick slurry; Then add wherein 600g of 5wt% PTFE emulsion was ultrasonically dispersed for 100min to prepare the leveling layer composition slurry.

[0041] The slurry prepared above was coated on the surface of the hydrophobically treated carbon cloth by manual screen printing to prepare the gas diffusion layer of the present invention.

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PUM

Property	Measurement	Unit
Particle size	20.0 ~ 40.0	nm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Improve utilization efficiency
Improve power generation efficiency

Fuel cell leveling layer composition and preparation method thereof as well as gas diffusion layer

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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