Novel single-layer gas diffusion layer for fuel cell and preparation method and application of novel single-layer gas diffusion layer

A gas diffusion layer and fuel cell technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems that hinder the commercialization of proton exchange membrane fuel cells, do not meet the concept of healthy and green development, and the cost of gas diffusion layers is high. The method is healthy and green, reduces proton conduction resistance, and is easy to industrialize the effect of

Pending Publication Date: 2022-01-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the complicated preparation process of carbon paper, including high-temperature heat treatment at thousands of degrees, the cost is high, and a large amount of organic solvents are used in the preparation process of the microporous layer. On the one hand, it does not conform to the concept of healthy and green development, and on the other hand, it also increases the preparation cost.
The high cost of the gas diffusion layer is one of the reasons hindering the commercialization of proton exchange membrane fuel cells

Method used

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  • Novel single-layer gas diffusion layer for fuel cell and preparation method and application of novel single-layer gas diffusion layer
  • Novel single-layer gas diffusion layer for fuel cell and preparation method and application of novel single-layer gas diffusion layer
  • Novel single-layer gas diffusion layer for fuel cell and preparation method and application of novel single-layer gas diffusion layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 1.0g of carbon fiber, 0.075g of hydrophobic binder PVDF, pore forming agent K 2 CO 3 2.0g, mechanically mixed by a pulverizer for 30 minutes, after being fully ground and mixed, spread the evenly mixed mixture in a self-made stainless steel mold to ensure a smooth surface. Then place the mold in a hot press, and first apply a pressure of 0.5 MPa at room temperature for 30 minutes to make the mixture into a sheet. Then release the pressure and heat to raise the temperature to 150°C, heat treatment at 150°C for 20 minutes to make the PVDF evenly distributed in the carbon-free, self-supporting microporous layer. Turn off the heating to allow the mold to cool naturally to room temperature, take out the obtained sheet sample from the mold, and then soak it in HCl solution for 2 hours to remove the pore-forming agent in the microporous layer and form pores inside the microporous layer, wherein the HCl solution The concentration is 2mol L -1 . After acid immersion, ...

Embodiment 2

[0037] Weigh carbon fiber 1.0g, hydrophobic binder PVDF 0.1111g, pore forming agent K 2 CO 3 2.0g, mechanically mixed by a pulverizer for 30 minutes, after being fully ground and mixed, spread the evenly mixed mixture in a self-made stainless steel mold to ensure a smooth surface. Then place the mold in a hot press, and first apply a pressure of 0.5 MPa at room temperature for 30 minutes to make the mixture into a sheet. Then the pressure is released and heated to raise the temperature to 150° C., and heat treatment at 150° C. for 60 minutes to make the PVDF evenly distributed in the carbon-free, self-supporting microporous layer. Turn off the heating to allow the mold to cool naturally to room temperature, take out the obtained sheet sample from the mold, and then soak it in HCl solution for 2 hours to remove the pore-forming agent in the microporous layer and form pores inside the microporous layer, wherein the HCl solution The concentration is 2mol L -1. After acid imm...

Embodiment 3

[0039] Weigh 1.0g of carbon fiber, 0.2g of hydrophobic binder PVDF, pore forming agent K 2 CO 3 2.0g, mechanically mixed by a pulverizer for 30 minutes, after being fully ground and mixed, spread the evenly mixed mixture in a self-made stainless steel mold to ensure a smooth surface. Then place the mold in a hot press, and first apply a pressure of 0.5 MPa at room temperature for 30 minutes to make the mixture into a sheet. Then the pressure was released and heated to raise the temperature to 350°C, and the heat treatment was carried out at 350°C for 60 minutes to make the PVDF evenly distributed in the carbon-free, self-supporting microporous layer. Turn off the heating to allow the mold to cool naturally to room temperature, take out the obtained sheet sample from the mold, and then soak it in HCl solution for 2 hours to remove the pore-forming agent in the microporous layer and form pores inside the microporous layer, wherein the HCl solution The concentration is 2mol L ...

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Abstract

The invention relates to a single-layer gas diffusion layer for a fuel cell and a preparation method and application of the single-layer gas diffusion layer, the gas diffusion layer only comprises a microporous layer, the microporous layer takes a carbon material, a hydrophobic binder and a pore-forming agent as raw materials, carbon-free paper and a self-supporting microporous layer are prepared through dry-method mold pressing, and the single-layer gas diffusion layer has good hydrophobicity, gas permeability and conductivity, and the resistance of water discharge can be reduced, so that cathode flooding is relieved. The dry-method preparation avoids the defect that cracks are generated on the surface due to solvent volatilization in a wet method, so that water logging caused by water gathering at the cracks is avoided. According to the prepared carbon-free paper, the thickness and porosity of the self-supporting microporous layer are controllable, the preparation process is simple, and conditions are mild. When the carbon-free paper and the self-supporting microporous layer prepared by the method are used as gas diffusion layers of fuel cells, relatively good electrochemical performance is achieved. The novel single-layer gas diffusion layer has wide application value in the field of fuel cells.

Description

technical field [0001] The invention relates to a single-layer gas diffusion layer for a fuel cell, a preparation method and application thereof, and belongs to the technical field of fuel cells. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy stored in fuel and oxidant into electrical energy through an electrochemical reaction. Compared with other conventional forms of power generation, it is not limited by the Carnot cycle, and the energy conversion efficiency can be Reach 60%, high reliability, environment friendly. Proton exchange membrane fuel cell (PEMFC) is a kind of fuel cell. It is a clean and efficient energy conversion device that can directly convert the chemical energy of hydrogen into electrical energy. It can be widely used in automobiles, power stations, portable power supplies, etc. . [0003] When the proton exchange membrane fuel cell operates at a high current density, if the produced wat...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8605H01M4/8657H01M4/8807Y02E60/50
Inventor 侯明王曼丽刘志成吕波艾军洪有陆邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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