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Preparation for carbon fiber paper used for gas diffusion layer of proton exchange membrane fuel cell

A technology of gas diffusion layer and proton exchange membrane, which is applied to fuel cell components, solid electrolyte fuel cells, fuel cells, etc., can solve the problems of carbon powder loss, energy consumption, low carbon powder utilization rate, etc., and achieve surface smoothness The effect of compact structure, good electrical conductivity and simple method

Inactive Publication Date: 2009-12-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, carbon fiber accounts for more than 96% of the base paper, which is also unfavorable for cost reduction
Moreover, after wet papermaking, the strength of carbon paper must not meet the strength requirements in proton exchange membrane fuel cells without resin hot pressing.
[0006] Traditional carbon fiber paper is made directly from carbon fiber. Due to the presence of polymer binders, its electrical conductivity is often not ideal. It is necessary to increase its heat treatment temperature to improve electrical conductivity, which results in a large amount of energy consumption.
[0007] Chinese patent CN1344039 relates to a kind of carbon fiber composite paper required by ion exchange membrane fuel cell electrode diffusion layer and its preparation method. Composed of 10% carbon powder, its preparation process is similar to that of Chinese patent CN1417879, only using conventional wet papermaking, the strength must be too low
And adding carbon powder into the slurry often causes the loss of carbon powder in the beating process, and the utilization rate of carbon powder is too low
[0008] The addition of carbon powder improves the conductivity of carbon fiber paper, but the above-mentioned patents add carbon powder to the slurry. During the papermaking process, the carbon powder is seriously lost, and there is very little remaining in the carbon fiber paper, which can play a conductive role. less toner

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Pitch-based carbon fibers with a carbon content of 85-99% and a diameter of 10-20 μm are treated with water at a water temperature of 70°C to remove impurities; PAN-based preoxidized fibers are activated with 3mol / L NaOH at a heating temperature of 40°C; The pitch-based carbon fiber after treatment is chopped, 3mm accounts for 50%, 6mm accounts for 50%, the plant fiber is chopped 8mm accounts for 30%, 10mm accounts for 30%, 12mm accounts for 40%; the PAN pre-oxidized wire after activation treatment is chopped to 7mm;

[0041] Anionic polyacrylamide is used as a dispersant to configure a dispersant aqueous solution, and the concentration is 0.2%; the three kinds of chopped fibers are mixed in proportion and dropped into the dispersant aqueous solution to prepare a slurry, and the mixed ingredients of the three kinds of chopped fibers are by weight, pitch-based carbon fiber: PAN-based preoxidized fiber: plant fiber is 16: 3: 1, stir evenly to obtain pulp for papermaking, ...

Embodiment 2

[0045] Pitch-based carbon fibers with a carbon content of 85-99% and a diameter of 10-20 μm are treated with water at a water temperature of 60°C to remove impurities; PAN-based preoxidized fibers are activated with 3mol / L KOH at a heating temperature of 50°C; the pitch Chopped base carbon fiber, 3mm accounted for 50%, 6mm accounted for 50%, plant fiber chopped 6mm accounted for 50%, 11mm accounted for 50%; the activated PAN pre-oxidized silk was chopped to 7mm;

[0046] Anionic polyacrylamide is used as a dispersant to configure a dispersant aqueous solution, and the concentration is 0.5%; three kinds of chopped fibers are mixed in proportion and dropped into a dispersant aqueous solution to prepare a slurry, and the mixed ingredients of the three kinds of chopped fibers are by weight, pitch-based carbon fiber: PAN-based preoxidized fiber: plant fiber is 20: 4: 1, stir evenly to obtain papermaking slurry, the slurry concentration is 0.07%, add polymer binder carboxymethyl cell...

Embodiment 3

[0050] Pitch-based carbon fibers with a carbon content of 85-99% and a diameter of 10-20 μm are treated with water at a water temperature of 100°C to remove impurities; for PAN-based preoxidized fibers, 2mol / L H 3 PO 4 Activation; chopped pitch-based carbon fiber, 50% of 3mm, 50% of 5mm, 30% of plant fiber 6mm, 30% of 9mm, 40% of 12mm; chopped PAN pre-oxidized wire after activation treatment to 10mm;

[0051] Polyethylene oxide is used as the dispersant to configure the dispersant aqueous solution, and the concentration is 0.1%; the three kinds of chopped fibers are mixed in proportion and dropped into the dispersant aqueous solution to prepare the slurry, and the mixed ingredients of the three kinds of chopped fibers are by weight, pitch-based carbon fiber: PAN Base pre-oxidized fiber: plant fiber is 19: 4: 2, stir evenly, obtain the slurry for papermaking, the slurry concentration is 0.06%, add macromolecular binder polyvinyl alcohol in the slurry and stir evenly, the addit...

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Abstract

The invention relates to a preparation for carbon fiber paper used for a gas diffusion layer of a proton exchange membrane fuel cell, which comprises the following steps: (1) carrying out water treatment on asphalt base carbon fiber, and carrying out activation treatment on PAN base pre-oxidized fiber; (2) chopping the fibers; (3) mixing the chopped fibers, and then carrying out wet papermaking forming to obtain raw paper; (4) dispersing carbon nano tubes and / or conductive carbon black grains in resin solution; (5) spraying the resin solution on the upper surface and the lower surface of the raw paper, drying the raw paper and then thermally pressing the raw paper into a semi-finished product; and (6) thermally treating the semi-finished product to obtain the carbon fiber paper. The preparation has simple process and low cost, and is suitable for industrialized production; and the carbon fiber paper has good electric conductivity, high porosity, smooth surface, compact structure and proper flexibility and rigidity.

Description

technical field [0001] The invention belongs to the field of preparation of carbon fiber paper, in particular to the preparation of carbon fiber paper used for the gas diffusion layer of a proton exchange membrane fuel cell. Background technique [0002] Fuel cells are known as the fourth-generation power generation device after water power, fire power, and nuclear energy and a power device that replaces internal combustion engines. The international energy community predicts that fuel cells will be one of the most attractive power generation methods in the 21st century. Among all kinds of fuel cells, proton exchange membrane fuel cells have become a new generation of fuel cells due to their high specific energy, light weight, low operating temperature and long working life. [0003] Proton exchange membrane fuel cell membrane electrode is a kind of porous gas diffusion electrode, generally composed of gas diffusion layer and catalyst layer. This high-performance gas diffu...

Claims

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Application Information

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IPC IPC(8): D21H19/72D21H13/50D21H19/10D21H19/84D21H23/50D21H25/06D21B1/02D21B1/04D21C3/22D21H21/08D21H21/06D21H19/24H01M4/88H01M4/96H01M8/02H01M8/10H01M8/1004
CPCY02E60/522Y02E60/50Y02P70/50
Inventor 王彪段琼娟王炯王华平
Owner DONGHUA UNIV
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