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Preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper

A fuel cell electrode and carbon fiber paper technology, which is applied in raw material separation, fiber raw material processing, paper, etc., to achieve the effects of low resistivity, excellent gas generation, and high conductivity

Inactive Publication Date: 2014-07-23
SHENYANG HUATIANXIN CARBON FIBER ELECTRIC HEATINGPROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are only a few advanced countries that can produce carbon fiber paper, and none of them in China can achieve small batch production, and some are only in the stage of experimental production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In parts by weight, 10 parts of raw wood pulp, 80 parts of chopped carbon fiber, and 10 parts of conductive carbon black. In this example, the preparation process of the carbon fiber paper, which is a material for the porous diffusion layer of the fuel cell electrode, is as follows:

[0051] (1) Surface treatment of chopped carbon fiber

[0052] Soak the chopped carbon fiber in a mixture of acetone, ethanol and water for 2.5 hours, by weight ratio, acetone:ethanol:water=1:1:20, then remove and drain the liquid;

[0053] Pour the chopped carbon fiber into the container, and add a dispersant (methyl cellulose) accounting for 0.2% of the total weight of the chopped carbon fiber, and perform high-speed separation and stirring at 2000 rpm for 1 hour;

[0054] (2) Surface treatment of conductive carbon black

[0055] Conductive carbon black is soaked in the aqueous ethanol solution of 5wt% by concentration after 3.5 hours, imports the refining tank together with aqueous eth...

Embodiment 2

[0063] In terms of parts by weight, there are 15 parts of raw wood pulp, 75 parts of chopped carbon fiber, and 10 parts of conductive carbon black. In this example, the preparation process of the carbon fiber paper, which is a material for the porous diffusion layer of the fuel cell electrode, is as follows:

[0064] (1) Surface treatment of chopped carbon fiber

[0065] Soak the chopped carbon fiber in a mixture of acetone, ethanol and water for 2 hours, by weight ratio, acetone:ethanol:water=1:1:20, then remove and drain the liquid;

[0066] Pour the chopped carbon fiber into the container, and add a dispersant (sodium carboxymethyl cellulose) accounting for 0.1% of the total weight of the chopped carbon fiber, and perform high-speed separation and stirring at 1000 rpm for 0.5 hours;

[0067] (2) Surface treatment of conductive carbon black

[0068] Conductive carbon black is soaked in the aqueous ethanol solution of 5wt% in concentration after 3 hours, imports refining ta...

Embodiment 3

[0076] In parts by weight, 20 parts of raw wood pulp, 70 parts of chopped carbon fiber, and 10 parts of conductive carbon black. In this example, the preparation process of the carbon fiber paper, which is a material for the porous diffusion layer of the fuel cell electrode, is as follows:

[0077] (1) Surface treatment of chopped carbon fiber

[0078] Soak the chopped carbon fiber in a mixture of acetone, ethanol and water for 3 hours, by weight ratio, acetone:ethanol:water=1:1:20, then remove and drain the liquid;

[0079] Pour the chopped carbon fiber into the container, and add a dispersant (hydroxyethyl cellulose) accounting for 0.3% of the total weight of the chopped carbon fiber, and perform high-speed separation and stirring at 3000 rpm for 2 hours;

[0080] (2) Surface treatment of conductive carbon black

[0081] Conductive carbon black is soaked in the aqueous ethanol solution of 5wt% by concentration after 4 hours, imports refining tank together with aqueous etha...

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Abstract

The invention relates to the field of fuel cell electrode porous diffusion layer materials, in particular to a preparation process of basic material carbon fiber paper for manufacturing fuel cell electrode porous diffusion layers. The carbon fiber paper can be produced on common paper machine production lines in a batch mode and meets the requirement for manufacture of fuel cell electrode porous diffusion layer electrodes. The preparation process comprises the steps of (1) performing surface treatment to short carbon fiber; (2) performing surface treatment to conductive carbon black; (3) smashing raw wood pulp and placing the raw wood pulp into a pulping pond, wherein the ratio of the raw wood pulp to water is 5-15%; and the like. The carbon fiber paper produced by means of the preparation process can meet the requirement for manufacture of the fuel cell electrode porous diffusion materials, can evenly support catalyst layers in electrodes and stabilizing electrode structures, further has functions of providing gas channels, electronic channels and drainage channels for electrode reaction and the like, and has porous structures, excellent gas generating performance, high conductivity, certain mechanical strength, chemical stability and heat stability.

Description

technical field [0001] The invention relates to the field of fuel cell electrode porous diffusion layer materials, in particular to a preparation process of carbon fiber paper, a basic material for manufacturing a fuel cell electrode porous diffusion layer. Background technique [0002] The gas diffusion layer material plays a role in supporting the catalyst layer and stabilizing the electrode structure in the electrode. It also provides fuel gas channels, electron channels and drainage channels for the electrode reaction. The influence of different diffusion layer materials on the structure, manufacturing process and performance of the electrode They are also different. Carbon fiber paper (carbon paper), carbon cloth, non-woven fabric and carbon black paper are commonly used electrode materials. [0003] At present, carbon fiber paper (carbon paper) and carbon cloth are used for the gas diffusion layer. They not only have a uniform porous thin-layer structure, but also hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/00D21B1/34D21C5/00D21D1/20
Inventor 石伟
Owner SHENYANG HUATIANXIN CARBON FIBER ELECTRIC HEATINGPROD
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