Method for increasing bending strength of gas diffusion layer in fuel cell

A gas diffusion layer and bending strength technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of little application value, uneconomical, and inability to be used as a fuel cell gas diffusion layer.

Active Publication Date: 2012-05-16
SHANGHAI PEARL HYDROGEN POWER SOURCE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering the application environment of the fuel cell, the influence of the pore structure of the fuel cell diffusion layer on the electrical performance of the fuel cell, etc., the above-mentioned method can no longer be used as a fuel cell gas diffusion layer, or is uneconomical, and has little application value.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Put a piece of soft 10cm*10cm domestic carbon fiber woven cloth (1k wire harness twill weave, thickness 0.5mm) into 10% PTFE emulsion for dipping, take it out and slowly dry it at 80°C, put it in Sintering was carried out in a muffle furnace at 360°C.

[0028] (2) Take 1 gram of Vulcan XC-72 produced by Carbot Company, add 50ml of ethanol and 50ml of water for ultrasonic oscillation, add 2 grams of 60% PTFE emulsion after 15 minutes, and stir for 15 minutes after ultrasonic oscillation for 15 minutes. Put the slurry into the domestic carbon fiber woven cloth of 10cm*10cm and screen-print it several times. In this way, 22 mg / cm of slurry per unit area can be obtained 2 gas diffusion layer.

[0029] (3) Put the diffusion layer prepared in steps 1 and 2 into a hydraulic press for hot pressing. The hot pressing temperature is 220°C and the pressure is 150kg / cm 2 After hot pressing, the pressed diffusion layer is taken out for use.

[0030] After step 1, step 2, and ...

Embodiment 2

[0032] (1) Put a piece of soft 10cm*10cm carbon fiber woven cloth produced by Taiwan Carbon Energy Technology (0.36mm in thickness) into 30% PTFE emulsion for dipping, take it out and dry it slowly at 80°C, and put it in 360°C after drying Sintering in a muffle furnace.

[0033] (2) Take 2 grams of Vulcan XC-72 produced by Carbot Company, add 50ml of ethanol and 50ml of water for ultrasonic vibration, add 5 grams of 60% PTFE emulsion produced by Shanghai 3F after 15 minutes, ultrasonically shake for 15 minutes and then stir for 15 minutes. The slurry was screen-printed on a 10cm*10cm carbon fiber woven cloth several times. In this way, 50 mg / cm of slurry per unit area can be prepared 2 gas diffusion layer.

[0034] (3) Put the diffusion layer prepared in steps 1 and 2 into a hydraulic press for hot pressing. The hot pressing temperature is 250°C and the pressure is 100kg / cm 2 After hot pressing, the pressed diffusion layer is taken out for use.

[0035] After step 1, step ...

Embodiment 3

[0037] (1) Put a piece of soft 10cm*10cm domestic carbon fiber non-woven fabric (thickness 0.3mm) into 20% PTFE emulsion and impregnate it, take it out and dry it slowly at 80°C, put it in a 360°C muffle after drying Sintering in the furnace.

[0038] (2) Take 2 grams of Vulcan XC-72 produced by Carbot, add 50ml of ethanol and 50ml of water for ultrasonic oscillation, add 5 grams of 60% PTFE emulsion after 15 minutes, ultrasonically oscillate for 15 minutes and then stir for 15 minutes. Put the slurry into the domestic carbon fiber non-woven fabric of 10cm*10cm by screen printing several times. In this way, 50 mg / cm of slurry per unit area can be prepared 2 gas diffusion layer.

[0039] (3) Put the diffusion layer prepared in steps 1 and 2 into a hydraulic press for hot pressing. The hot pressing temperature is 250°C and the pressure is 100kg / cm 2 After hot pressing, the pressed diffusion layer is taken out for use.

[0040] After step 1, step 2, and step 3, the bending st...

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Abstract

The invention relates to a method for increasing bending strength of a gas diffusion layer in a fuel cell, and the method comprises the following steps: firstly dipping a gas diffusion layer with a hydrophobic emulsion, drying, burning and curing to obtain a treated gas diffusion layer, loading the layer with carbon powder-resin mixed slurry, drying, burning and curing, finally performing hot-pressing treatment of the gas diffusion layer loaded with the carbon powder-resin mixed slurry so as to obtain the gas diffusion layer with high bending strength. Compared with the prior art, the invention ensures that the requirements for the diffusion layer by a fuel cell are met, and the exertion of the fuel cell performance is not affected; the invention allows carbon fiber cloth to be used as an excellent conductive material and be used as a diffusion layer material which can be successfully used in fuel cells; the bending strength is high enough to allow the carbon fiber cloth to completely replace carbon paper; and the carbon fiber cloth can be used as an enhanced diffusion layer material for practical application in cells.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for improving the bending strength of a gas diffusion layer in a fuel cell. Background technique [0002] The PEMFC electrode is a gas diffusion electrode, the PEMFC electrode is a porous gas diffusion electrode, and the gas diffusion layer is an important component material of the electrode. Commonly used gas diffusion layer materials include carbon fiber paper, carbon fiber woven cloth, non-woven cloth and carbon black paper. Among them, carbon fiber paper is a gas diffusion layer material widely used in electrodes. PEMFC must meet the following performance requirements: (1) uniform porous structure, giving it excellent air permeability; (2) low resistivity, giving it It has high electronic conductivity; (3) compact structure and smooth surface, which reduces contact resistance and improves electrical conductivity; (4) has certain mechanical strength, which is beneficial to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 田丙伦
Owner SHANGHAI PEARL HYDROGEN POWER SOURCE TECH
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