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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 beneficial to achieve the effect of leveling the surface of carbon paper, and this ink is not suitable for large-scale production, which brings many difficulties to speculate and analyze the pore size and pore distribution in the leveling layer
[0006] Chinese patent CN1906784A discloses a gas diffusion layer and a fuel cell using a gas diffusion layer. Water-soluble inorganic salts are used as pore-forming agents. At the same time, catalyst powder is added to this conductive carbon powder material, although to a certain extent the The contact resistance between the leveling layer and the catalytic layer, but causes waste of catalyst

Method used

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

Examples

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Effect test

Embodiment 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.

Embodiment 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.

Embodiment 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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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.

Description

technical field [0001] The present invention relates to a fuel cell, in particular to a proton exchange membrane fuel cell leveling layer composition and a gas diffusion layer comprising the composition, and the present invention also relates to the above-mentioned proton exchange membrane fuel cell leveling layer composition Preparation. Background technique [0002] As a new power source, proton exchange membrane fuel cell (PEMFC) has the advantages of clean and pollution-free, low noise, low operating temperature, and high power generation ratio. It has been paid more and more attention by the power supply and electronic product application industries. [0003] The core part of the proton exchange membrane fuel cell is the membrane electrode assembly (MEA). From the structural analysis, MEA usually consists of five major components: cathode / anode gas diffusion layer, cathode / anode catalyst layer, and proton exchange membrane, among which the proton exchange membrane has...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/88H01M8/10H01M8/0243
CPCY02E60/50
Inventor 梁慧
Owner HANERGY TECH
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