A fuel cell gas diffusion layer and a preparation method thereof

A gas diffusion layer, fuel cell technology, applied in fuel cells, electrical components, battery electrodes, etc., can solve the problem of no GDL preparation or quality control to provide detailed descriptions, etc., to achieve superior performance and water management capabilities, good pore structure and the effect of hydrophobic properties

Inactive Publication Date: 2019-01-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in all these literatures / publications, there is no detailed description of the preparation or quality control of GDL, which are crucial for optimal performance and reproducible preparation of GDL

Method used

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  • A fuel cell gas diffusion layer and a preparation method thereof
  • A fuel cell gas diffusion layer and a preparation method thereof
  • A fuel cell gas diffusion layer and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Use commercial graphitized carbon powder, disperse the slurry with the help of a homogenizer, and then use mechanical stirring to add polytetrafluoroethylene (PTFE) solution (60% mass fraction aqueous solution) to the mixture. The total amount of PTFE added is carbon / PTFE The dry weight ratio is 60 / 40. After adding PTFE, add a thickener to adjust the viscosity of the mixture. The final carbon concentration in the slurry is 2.5-4%.

Embodiment 2

[0047] The slurry prepared in Example 1 was used to prepare a microporous layer on Toray 090 carbon paper (Toray CA Tokyo, Japan, 280um thick), and the sample was heat-treated at >300°C to remove additives and promote PTFE to form carbon and PTFE uniform The mixture was bonded and the resulting microporous layer had a loading of 22.24 grams per square meter.

Embodiment 3

[0049] The slurry prepared in Example 1 was used to prepare a microporous layer on SGL 29AA carbon paper (SGL CARBON GmbH, Meitingen, Germany; 190 um thick) with a loading of 33.11 g / m2.

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Abstract

The invention relates to a fuel cell gas diffusion layer and a preparation method thereof. The gas diffusion layer includes an electrically conductive mesh structure serving as a carrier and a coatingcoated on one or both sides of the electrically conductive mesh structure, the coating comprises carbon powder and binder, wherein the coating is a porous structure with characteristic porosity and hydrophobicity, and is prepared by dispersing the carbon powder particles into water, dispersing the slurry through a homogenizer, adding the binder, stirring the slurry mechanically, and adjusting theslurry mixture to a proper viscosity; Coating the slurry mixture onto the surface of the conductive mesh structure; The sample is heat-treated to remove the additive to form a homogeneous adhesive mixture of carbon and binder to produce the product. As compare with that prior art, the gas diffusion layer of the present invention has good pore structure and hydrophobic property, and has superior performance and water management capability when hydrogen / oxygen or hydrogen / air or other fuel cells are operated.

Description

technical field [0001] The invention relates to a gas diffusion layer, in particular to a fuel cell gas diffusion layer based on carbon dispersion and aperture regulation and a preparation method thereof. Background technique [0002] Gas Diffusion Layer (GDL for short) is usually used in electrochemical fields, such as fuel cells and electrolyzers, especially in those applications where ion exchange membranes are used as separators or electrolytes. The gas diffusion layer usually uses a network-structured object as a carrier and support, and then a microporous coating, that is, micro-porous layer (MPL), is applied to one or both sides of the substrate. The function of the coating is the transportation of water and gas and the passage of electric current. The basic unit of fuel cell stack power generation is the membrane electrode (MEA). The two most important methods for preparing membrane electrodes are: gas diffusion electrode method (GDE) and catalyst coating method (CC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/0234H01M8/0245
CPCH01M4/8605H01M4/8657H01M4/8668H01M4/8807H01M8/0234H01M8/0245Y02E60/50
Inventor 余卓平邹裕民林瑞单璟陈夏栋黄云辉
Owner TONGJI UNIV
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