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Gas diffusion layer and preparation method and application thereof

A gas diffusion layer and dispersant technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as difficult water discharge, catalyst penetration, and increased diffusion resistance of reaction gases

Inactive Publication Date: 2011-06-29
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Although the above process makes the surface of the substrate material smooth, it cannot completely prevent the catalyst from penetrating into the substrate material. Because the pore size is either too large or too small, the diffusion resistance of the reaction gas increases or the moisture generated by the reaction is difficult to discharge.

Method used

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  • Gas diffusion layer and preparation method and application thereof

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preparation example Construction

[0046] Simultaneously, another technical scheme adopted by the present invention is: a kind of preparation method of gas diffusion layer, and its preparation steps are as follows:

[0047] 1) The carbon fiber material, dispersant and deionized water are configured into a uniform slurry, wherein the consumption of each component is: the carbon fiber material is 5-30wt% of the slurry, and the dispersant is 5-30wt% of the carbon fiber material; Add PTFE emulsion to the material and stir for 0.5-2 hours, wherein the amount of PTFE emulsion is 1050wt% of the carbon fiber material; then add a viscosity modifier to adjust the viscosity of the slurry to 1000-30000cps to obtain the carbon fiber slurry;

[0048] 2) The carbon black powder or the mixture of carbon black powder and carbon fiber, deionized water, and dispersant are configured into a uniform slurry, wherein the amount of each component is: carbon black powder or the mixture of carbon black powder and carbon fiber is the slur...

Embodiment 1

[0053] Weigh 60.0080g of 60% PTFE emulsion into a 250mL beaker, add 60-180g of deionized water, and stir with a magnetic stirring bar for about 15min to make it evenly dispersed. Pour 10-30% PTFE solution into a clean petri dish, immerse the cut carbon paper or carbon cloth (cleaning, drying, weighing) into the solution horizontally, then put it into a vacuum oven, and adjust the vacuum to 200Pa, after soaking for 1min, take out the carbon paper, blot the solution on the edge of the carbon paper or carbon cloth with filter paper, and then dry it horizontally (about 6min). Then put the carbon paper or carbon cloth into a high-temperature oven, set the temperature at 70°C, and take it out after drying for about 6 minutes. Then put the carbon or carbon cloth paper in an oven and sinter at 350°C for 30 minutes, so that the loading capacity of PTFE is 1-10mg.cm -2 .

[0054] Weigh 3.0 g of carbon fiber powder with a 50 ml beaker. Add 9ml of deionized water into a 100ml beaker, a...

Embodiment 2

[0057] Weigh 60.0080g of 60% PTFE emulsion into a 250mL beaker, add 60-180g of deionized water, and stir with a magnetic stirring bar for about 15min to make it evenly dispersed. Pour 10-30% PTFE solution into a clean petri dish, immerse the cut carbon paper or carbon cloth (cleaning, drying, weighing) into the solution horizontally, then put it into a vacuum oven, and adjust the vacuum to 200Pa, after soaking for 1min, take out the carbon paper, blot the solution on the edge of the carbon paper or carbon cloth with filter paper, and then dry it horizontally (about 6min). Then put the carbon paper or carbon cloth into a high-temperature oven, set the temperature at 70°C, and take it out after drying for about 6 minutes. Then put the carbon or carbon cloth paper in an oven and sinter at 350°C for 30 minutes, so that the loading capacity of PTFE is 1-10mg.cm -2 .

[0058] Weigh 3-20g of acetylene black powder or other carbon black in a 200ml beaker, add a certain concentration...

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Abstract

The invention discloses a gas diffusion layer and a preparation method and application thereof. The gas diffusion layer comprises a carbon black layer (2) with the micropore diameter of 30 to 100 microns and / or a carbon fiber layer (1) with the micropore diameter of 50 to 150 microns. The gas diffusion layer can be widely applied to gas diffusion electrodes in fuel cells, electrolytic cells and ultracapacitor electrochemical reaction devices. The invention simultaneously discloses a preparation method of the gas diffusion layer. The gas diffusion layer has a simple, rational and compact structure, overcomes various defects of the prior art, and has the advantages of high air permeability, high drainage, high conductivity, stable catalyst layers and high catalyst utilization rate.

Description

technical field [0001] The invention relates to an electrochemical reaction device, in particular to a gas diffusion layer and its preparation method and application. Background technique [0002] The electrodes of fuel cells, electrolytic cells, and supercapacitors are porous gas diffusion electrodes, generally composed 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] For example, in a 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/94H01M4/88
CPCY02E60/50
Inventor 顾军于涛刘建国邹志刚
Owner NANJING UNIV
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