Process for manufacturing porous diffusion layer electrode plate of fuel cell by utilizing carbon fiber paper

Abstract

The invention relates to the field of fuel cell porous diffusion layer electrode plates, in particular to a process for making fuel cell porous diffusion layer electrode plates using carbon fiber paper, which meets the batch industrial production requirements for manufacturing fuel cell porous diffusion layer electrodes. The carbon fiber paper of the present invention is impregnated with a mixture of modified phenolic resin and epoxy resin, dried and then subjected to high temperature and high pressure to form a substrate, and finally subjected to high temperature carbonization to form a porous diffusion layer electrode plate for a fuel cell. The carbonized porous diffusion layer electrode plate of the present invention has a uniform porous structure, excellent air permeability, low resistivity and high electron conductivity, and has a compact structure, smooth surface, certain mechanical strength and stable chemical properties. And thermal stability, and can meet various requirements of the porous diffusion layer electrode plate, such as: porosity ≥ 75%, resistivity ≤ 0.05Ω·cm, gas diffusion coefficient ≥ 0.15cm2 / s.

Description

technical field

[0001] The invention relates to the field of fuel cell porous diffusion layer electrode plates, in particular to a process for making fuel cell porous diffusion layer electrode plates using carbon fiber paper. 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 have good electrical conductivity, ...

Examples

Embodiment 1

[0087] 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:

[0088] 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:

[0089] (1) Surface treatment of chopped carbon fiber

[0090] 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;

[0091] 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;

[0092] (2) Surface treatment of conductive carbon black...

Embodiment 2

[0119] 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:

[0120] 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:

[0121] (1) Surface treatment of chopped carbon fiber

[0122] 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;

[0123] 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;

[0124] (2) Surface ...

Embodiment 3

[0151] 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:

[0152] 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:

[0153] (1) Surface treatment of chopped carbon fiber

[0154] 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;

[0155] 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;

[0156] (2) Surface treatment of conductive carbo...

technical field

[0001] The invention relates to the field of fuel cell porous diffusion layer electrode plates, in particular to a process for making fuel cell porous diffusion layer electrode plates using carbon fiber paper. 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 have good electrical conductivity, ...

Examples

Embodiment 1

[0087] 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:

[0088] 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:

[0089] (1) Surface treatment of chopped carbon fiber

[0090] 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;

[0091] 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;

[0092] (2) Surface treatment of conductive carbon black...

Embodiment 2

[0119] 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:

[0120] 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:

[0121] (1) Surface treatment of chopped carbon fiber

[0122] 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;

[0123] 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;

[0124] (2) Surface ...

Embodiment 3

[0151] 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:

[0152] 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:

[0153] (1) Surface treatment of chopped carbon fiber

[0154] 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;

[0155] 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;

[0156] (2) Surface treatment of conductive carbo...