Gas diffusion layer for low temp fuel cell and preparing process thereof

A gas diffusion layer and fuel cell technology, which is applied to fuel cells, fuel cell parts, electrical components, etc., can solve the problems of serious mass transfer polarization and suboptimal pore structure of the diffusion layer.

Active Publication Date: 2007-04-18
SUNRISE POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the actual situation is that two-phase flow coexists inside the entire diffusion layer, that is, gas and liquid water exist at the same time, and the pore structure produced by a single type of carbon powder structure is also single, so the problem of mass transfer polarization is still very serious
[0008] To sum up, at present, a single type of conductive carbon material is mostly used in the preparation of the microporous layer. The pore structure of the diffusion layer prepared in this way is not optimal, and the hydrophilic / hydrophobic properties need to be adjusted.

Method used

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  • Gas diffusion layer for low temp fuel cell and preparing process thereof
  • Gas diffusion layer for low temp fuel cell and preparing process thereof
  • Gas diffusion layer for low temp fuel cell and preparing process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: Get 0.9g acetylene black (~42nm, 62m 2 / g) and 0.1g Black Pearls 2000 (~15nm, 1500m 2 / g) carbon powder, fully ground, after uniform mixing, add 50ml ethanol solution, after ultrasonic dispersion 15min, add 4285.7mg10% PTFE emulsion, mechanical stirring and ultrasonic dispersion make PTFE evenly dispersed in carbon powder, make slurry, scrape Coated on both sides of the carbon paper treated with water repellent, the PTFE content of the base layer is 20wt.%. The amount of carbon powder on the catalytic layer side and the carbon powder on the flow field side are both 0.5 mg / cm 2 , and the diffusion layer is recorded as (0.5 / 0.5). After drying naturally, place it in a baking furnace, heat at 240°C for 40 minutes, and bake at 340°C for 40 minutes. The prepared cathode and anode diffusion layers were placed on both sides of the proton conduction membrane with the catalytic layer, and hot-pressed at 160°C and 10.0MPa for 1min to form a three-in-one membrane el...

Embodiment 2

[0035] Embodiment 2: Get 0.9g acetylene black (~42nm, 62m 2 / g) and 0.1g Black Pearls 2000 (~15nm, 1500m 2 / g) carbon powder, fully ground, after uniform mixing, add 50ml ethanol solution, after ultrasonic dispersion 15min, add 4285.7mg10% PTFE emulsion, mechanical stirring and ultrasonic dispersion make PTFE evenly dispersed in carbon powder, make slurry, scrape Coated on both sides of the carbon paper treated with water repellent, the PTFE content of the base layer is 20wt.%. Among them, the carbon powder load on the catalytic layer side is 0.7mg / cm 2 , the amount of carbon powder on the flow field side is 0.3mg / cm 2 , the diffusion layer is recorded as (0.7 / 0.3). After natural drying, place in a roasting furnace, heat at 240°C for 40 minutes, and bake at 340°C for 40 minutes. A single cell was assembled according to the method of Example 1. See Figure 3 for the battery performance curve.

Embodiment 3

[0036] Embodiment 3: Get 0.9g acetylene black (~42nm, 62m 2 / g) and 0.1g Black Pearls 2000 (~15nm, 1500m 2 / g) carbon powder, fully ground, after uniform mixing, add 50ml ethanol solution, after ultrasonic dispersion 15min, add 4285.7mg10% PTFE emulsion, mechanical stirring and ultrasonic dispersion make PTFE evenly dispersed in carbon powder, make slurry, scrape Coated on both sides of the carbon paper treated with water repellent, the PTFE content of the base layer is 20wt.%. The amount of carbon powder on the side of the catalytic layer is 1.0mg / cm 2 , the amount of carbon powder on the flow field side is 0mg / cm 2 , and the diffusion layer is recorded as (1.0 / 0.0). After natural drying, place in a roasting furnace, heat at 240°C for 40 minutes, and bake at 340°C for 40 minutes. A single cell was assembled according to the method of Example 1. See Figure 3 for the battery performance curve.

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Abstract

The invention relates to a low-temperature fuel cell, concretely a gas diffusion layer for low-temperature fuel cell and the preparing method thereof, where the gas diffusion layer is composed of substrate layer and microporous laye, and the microporous layer is mixed of two or more conductive carbon materials. And the preparing method: taking and mixing two or more conductive carbon materials in proportion into composite conductive material, uniformly diffusing the composite condutive material and hydrophobic agent in solvent to form plup; uniformly arranging the pulp on one or two sides of a hydrophobic processed porous conductive substrate; finally forming the gas diffusion layer by thermal treatment. Because of preparing microporous layer by compositive conductive material, it forms a double-function hole structure beneficial to reacting gas transmission and liquid water transmission, improving battery performances.

Description

technical field [0001] The invention relates to a low-temperature fuel cell, in particular to a gas diffusion layer for a low-temperature fuel cell and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell, as a high-efficiency and environment-friendly power generation device, has become a research and development hotspot in various countries in recent years. Its core component, the three-in-one membrane electrode (MEA), is usually prepared by a hot-pressing process from a gas diffusion layer, a catalytic layer and a proton exchange membrane. 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. It realizes the redistribution of reaction gas and product water between the flow field and the catalytic layer, and is one of the key components affecting the performance of the electrode. [0003] A gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/88H01B1/04H01M8/0234H01M8/0243
CPCY02E60/50
Inventor 张华民王晓丽徐海峰张建鲁衣宝廉
Owner SUNRISE POWER CO LTD
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