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Fuel-cell gas dispersion layer, and method for producing same

A gas diffusion layer and fuel cell technology, applied in fuel cells, solid electrolyte fuel cells, electrical components, etc., can solve problems such as the durability of porous layers, achieve high power generation performance, excellent smoothness, and suppress short-circuit effects

Active Publication Date: 2015-10-14
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a trade-off relationship between increasing the gas diffusibility and water drainage in the thickness direction and reducing the air permeability in the planar direction, and it is difficult to balance and coexist the two at a higher level.
In addition, in Patent Document 5, in order to improve the gas diffusivity in the thickness direction, a method of intentionally introducing a concave structure into the surface of the porous layer is proposed, but if power generation is repeated, problems may arise in the durability of the porous layer.

Method used

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  • Fuel-cell gas dispersion layer, and method for producing same
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  • Fuel-cell gas dispersion layer, and method for producing same

Examples

Experimental program
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Effect test

Embodiment 1

[0182] Toray Co., Ltd.'s polypropylene eye-based carbon fiber "Tureka" (registered trademark) T300 (average single fiber diameter: 7μm) is cut into a length of 12mm, and it is continuously sheeted using water as a sheeting medium, and then dipped in polyvinyl alcohol. 10% by mass aqueous solution and drying papermaking process, the mass per unit area of ​​carbon fiber is 16g / m 2 Long strips of carbon fiber paper. The amount of polyvinyl alcohol added corresponds to 20 parts by mass relative to 100 parts by mass of carbon fibers.

[0183] A dispersion liquid in which flaky graphite (average particle diameter: 5 μm), phenol resin, and methanol were mixed in a mass ratio of 1:9:50 was prepared. After the above-mentioned dispersion liquid is continuously impregnated in the above-mentioned carbon fiber paper at a temperature of 90° C. to obtain a resin-impregnated carbon fiber paper (pre-preg body). As the phenolic resin, a resin obtained by mixing a resol type phenolic resin an...

Embodiment 2

[0198] Except in in Example 1, the average thickness t1 (μm) of the porous layer (A) after sintering is changed to 15μm, the mass per unit area of ​​the porous layer (A) is 8g / m 2 Except for this, a gas diffusion layer was obtained in the same manner as in Example 1. As a result of evaluating the power generation performance of the gas diffusion layer, the blocking resistance was good. The output voltage is 0.37V (operating temperature is 65°C, humidification temperature is 70°C, current density is 2.2A / cm 2 ), the critical temperature is 90°C (the humidification temperature is 70°C, the current density is 1.2A / cm 2 ), as shown in Table 1, the overflow resistance and drying resistance were good. Cracks on the surface of the porous layer (A) were not confirmed.

Embodiment 3

[0200]Except in in Example 1, the average thickness t1 (μm) of the porous layer (A) after sintering is changed to 52μm, the mass per unit area of ​​the porous layer (A) is 26 / m 2 Except for this, a gas diffusion layer was obtained in the same manner as in Example 1. As a result of evaluating the power generation performance of this gas diffusion layer, the anti-clogging property was extremely good. The output voltage is 0.36v (the operating temperature is 65°C, the humidification temperature is 70°C, and the current density is 2.2A / m 2 ), the critical temperature is 90°C (the humidification temperature is 70°C, and the current density is 1.2A / cm 2 ), as shown in Table 1, the overflow resistance and drying resistance were good. The number of cracks on the surface of the porous layer (A) was one.

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Abstract

A fuel-cell gas dispersion layer configured from a porous carbon fiber substrate obtained by binding discontinuous carbon fibers using a carbide, and a porous layer containing at least carbonaceous particles, wherein: a porous layer (A) is disposed on one surface (A) of the porous carbon fiber substrate so as to have an average thickness (t1) of 10-55μm; a porous layer (J) is inserted into the interior of the porous carbon fiber substrate in a manner such that at least a portion thereof is present on the opposite surface (B); the proportion of the cross-sectional area in the thickness direction of openings in the interior of the porous carbon fiber substrate is 5-40%; the proportion of openings in the porous layer (A) and / or the porous layer (J) is 50-85%; the thickness of the porous carbon fiber substrate is 60-300μm; and the bulk density of the porous carbon fiber substrate is 0.20-0.45g / cm3.

Description

technical field [0001] The invention relates to a gas diffusion layer suitable for fuel cells, especially solid polymer fuel cells. More specifically, it relates to a gas diffusion layer which has high gas diffusivity and high water drainage in the thickness direction in order to improve power generation performance, and which is capable of preventing short cut of gas between the grooves of the separator. ), the gas (hydrogen, oxygen) supplied from the separator is uniformly supplied to the catalyst layer, the air permeability in the planar direction is low, and the mechanical properties, electrical conductivity, and thermal conductivity are excellent. Background technique [0002] A solid polymer fuel cell that supplies a hydrogen-containing fuel gas to the anode, supplies an oxygen-containing oxidizing gas to the cathode, and obtains power generation capacity through an electrochemical reaction at both electrodes generally has the following structure: Separator, gas diffu...

Claims

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Application Information

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IPC IPC(8): H01M4/96H01M4/88H01M8/10
CPCH01M4/8807H01M4/8821H01M2008/1095Y02E60/50H01M8/0234H01M8/0241H01M8/0245H01M8/0239
Inventor 冈野保高安德浩一和田原英辅
Owner TORAY IND INC
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