Method for producing fuel battery gas diffusion layer

A gas diffusion layer and fuel cell technology, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of unstable diffusion layer structure, unsuitability for large-scale production, and increased production costs, and achieve a stable and good diffusion layer structure. The effect of reducing electrical conductivity and processing cost

Inactive Publication Date: 2007-08-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires specially designed large-scale equipment and is not suitable for mass production
The process of the above methods is relatively complicate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 5-40g of acetylene black powder or other carbon black in a 200ml beaker, add a certain concentration of dispersant, such as XH-1, AEO-9, FC4430, Tween-60, Triton X-100, etc. The powder is stirred into a dough. In a 2500ml beaker, add 200-500ml of the above-mentioned dispersant with a concentration of 0.5-10%, and then add a certain amount of distilled water. Stir the solution with a high-shear emulsifier, and add doughy carbon black into the beaker 10 times every 2 minutes. After all was added, the shearing was continued for 30 min. Divide the dispersion in the beaker into two stainless steel cups (14cm), and put it into an ultrasonic disperser to ensure that the water in the water tank reaches half the height of the stainless steel cup. Sonicate for 1.0 hours. Gradually add a mixture of PTFE (5-60ml, 60%) and a certain amount of distilled water to the slurry, and continue to stir for 0.5 hours. The slurries in the 2 stainless steel cups were combined, then di...

Embodiment 2

[0028] Weigh 5-40g of acetylene black powder or other carbon black in a 200ml beaker, add a certain concentration of dispersant, such as XH-1, AEO-9, FC4430, Tween-60, Triton X-100, etc. The powder is stirred into a dough. In a 2500ml beaker, add 200-500ml of the above-mentioned dispersant with a concentration of 0.5-10%, and then add a certain amount of distilled water. Stir the solution with a high-shear emulsifier, and add doughy carbon black into the beaker 10 times every 2 minutes. After all was added, the shearing was continued for 30 min. Divide the dispersion in the beaker into two stainless steel cups (14cm), and put it into an ultrasonic disperser to ensure that the water in the water tank reaches half the height of the stainless steel cup. Sonicate for 1.0 hours. Cut the carbon paper or carbon cloth into a size of 200×200mm, put it flat into the slurry and soak it for 1-10min, take it out, put it upright on the filter paper for 0.5min, then put it flat on the sta...

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Abstract

This invention relates to a preparation method for fuel cell gas diffusion layers, which mixes carbon black powder, distilled water and dispersant according to the following proportion: the volume of dispersant is 5-30wt% that of carbon black, the volume of carbon black powder is 1-20wt% that of the entire system, the size of carbon black is 30-1000nm, then adds PTFE or PVDF latex of 10-60% concentration in said carbon black dispersed system uniformly by supersonics, mechanical high speed cutting or mixing for 0.5-3hours, and the content of PTFE or PVDF is 10-50wt% that of the carbon black, and puts carbon paper or cloth in the system to dip for 0.5-15min to take out and dry it and puts it in a dry box to be dried for 5-60min under 45-150deg.C to get carbon paper or cloth carried with carbon black and PTFE or PVDF.

Description

technical field [0001] The invention relates to the preparation of fuel cell parts, especially a preparation method of fuel cell gas diffusion layer. Background technique [0002] The PEMFC electrode in the proton exchange membrane fuel cell is a kind of porous gas diffusion electrode, which generally consists of a diffusion layer and a catalyst layer. Different diffusion layer materials have a great influence on the structure, fabrication process and performance of the electrode. [0003] In the proton exchange membrane fuel cell, the fuel gas passes through the anode diffusion layer to the catalyst layer, and the electrode reaction occurs under the action of the catalyst, that is, [0004] h 2 -2H+2e [0005] The electrons generated by the electrode reaction flow through the external circuit to the cathode through the conduction of the diffusion layer, and at the same time, the hydrogen ions reach the cathode under the action of the proton exchange membrane. After oxyg...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 顾军于涛祝梅邹志刚
Owner NANJING UNIV
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