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Fuel cell electrode gas diffusion layer carbon fiber paper manufactured with pulp and preparation method thereof

A fuel cell electrode and gas diffusion layer technology, which is applied in battery electrodes, papermaking, synthetic cellulose/non-cellulose material pulp/paper, etc., can solve the problems of easy peeling of carbon fibers, low surface finish, and easy damage. , to achieve the effects of excellent gas dispersibility, high electrical conductivity and excellent gas-forming properties

Inactive Publication Date: 2019-11-22
CHINA HAISUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The technical problem to be solved by the present invention is: the existing carbon fiber paper can not take into account the air permeability and mechanical strength of carbon fiber paper well, it is brittle and lacks flexibility, and it is easy to be damaged during the preparation of membrane electrodes and fuel cell assembly process, and the surface roughness is poor. Low, chopped carbon fiber is easy to peel off and high production costs

Method used

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  • Fuel cell electrode gas diffusion layer carbon fiber paper manufactured with pulp and preparation method thereof
  • Fuel cell electrode gas diffusion layer carbon fiber paper manufactured with pulp and preparation method thereof
  • Fuel cell electrode gas diffusion layer carbon fiber paper manufactured with pulp and preparation method thereof

Examples

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Effect test

Embodiment 1

[0043] A method for making fuel cell electrode gas diffusion layer carbon fiber paper by wet method, comprising the following steps:

[0044] 1. Pulping A: Mix carbon fibers with an average length of 1 to 4mm and adhesive fibers with an average length of 2mm at a ratio of 88:12, add 50 times of water and stir for 30 minutes, add 1% of PAM and then Pump it into a deflagging machine for 30 minutes, add water to prepare a slurry with a solid content of 1%, and keep stirring for more than 2 hours to obtain slurry A for later use.

[0045] 2. Pulping B: Mix carbon fibers with an average length of 1 to 4mm and adhesive fibers with an average length of 2mm at a ratio of 82:18, add 50 times of water and stir for 30 minutes, add 1% of PAM and then Pump it into a deflagger for 30 minutes, add water to prepare a slurry with a solid content of 1%, and obtain slurry B.

[0046]3. Pulp C: add carbon nanotubes to the slurry B according to 0.2% of the dry matter content of the fiber, add gra...

Embodiment 2

[0052] A method for making fuel cell electrode gas diffusion layer carbon fiber paper by wet method, comprising the following steps:

[0053] Except that the flow ratio of the flow rate of flow-type Internet access: spray type Internet access in step 4 in Embodiment 1 is 1:5, the others are completely the same as Embodiment 1.

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Abstract

The invention discloses a fuel cell electrode gas diffusion layer carbon fiber paper manufactured with pulp and a preparation method thereof. The preparation method mainly comprises the steps of making the pulp, mixing the pulp, manufacturing the paper in a combined manner of downstream net papermaking and guniting net papermaking, drying, hot pressing and the like. The mechanical property of theprepared carbon fiber paper is improved by adding the bonding fibers, and the carbon nanotubes, graphene and the activated carbon are added when the pulp is mixed. The prepared carbon fiber paper comprises a base paper bottom layer made by downstream net papermaking and a base paper surface layer made by guniting net papermaking, and the graphene, the carbon nanotubes and the activated carbon arecontained in the base paper surface layer. The carbon fiber paper prepared by the invention has a porous structure, the excellent gas-forming property, low resistance and high conductivity, and can provide gas, electron and drainage channels for electrode reaction, has the certain mechanical strength, chemical stability, thermal stability, thermal conductivity, gas dispersion and homogenization characteristics, has a large specific surface area, can adsorb the harmful gas, buffers the system reaction, and avoids the instability after high-temperature treatment.

Description

technical field [0001] The invention relates to a porous medium diffusion layer for a proton exchange membrane, in particular to a method for making carbon fiber paper for a fuel cell electrode gas diffusion layer by a wet method. Background technique [0002] A fuel cell is an electrochemical energy conversion device in a non-combustion process. Generally, fuels such as hydrogen, methanol, and oxidants such as oxygen undergo oxidation-reduction reactions to continuously convert chemical energy into electrical energy. electrochemical power generation device. Therefore, the efficiency of fuel cells can reach more than 90%, far exceeding that of ordinary internal combustion engines. [0003] The fuel used in fuel cells is not non-renewable resources such as fossil fuels, but renewable energy such as hydrogen and methanol. So that human energy acquisition is no longer subject to geological conditions. When the fuel cell uses pure hydrogen as fuel, the chemical reaction produ...

Claims

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Application Information

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IPC IPC(8): D21F11/00D21H13/50D21H27/00H01M4/88
CPCD21F11/00D21H13/50D21H27/00H01M4/8807Y02E60/50
Inventor 唐婷婷张园园张佳琳黄德飞吴立群
Owner CHINA HAISUM ENG
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