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Gas diffusion layer for proton exchange film fuel cell and preparation method thereof, and proton exchange film fuel cell

A proton exchange membrane and gas diffusion layer technology, applied in fuel cells, battery electrodes, electrical components, etc., can solve the problems of insufficient uniformity and smoothness of the microporous layer, leakage of slurry into the interior of the base layer, etc. The effect of eliminating sintering treatment and uniform pore size distribution

Active Publication Date: 2019-10-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of this, the present invention provides a gas diffusion layer for a proton exchange membrane fuel cell and a preparation method thereof and a proton exchange membrane fuel cell, which are used to solve the problem of preparing a microporous layer by a wet method in the prior art. The slurry leaks into the base layer, and the microporous layer is not uniform and flat enough

Method used

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  • Gas diffusion layer for proton exchange film fuel cell and preparation method thereof, and proton exchange film fuel cell
  • Gas diffusion layer for proton exchange film fuel cell and preparation method thereof, and proton exchange film fuel cell
  • Gas diffusion layer for proton exchange film fuel cell and preparation method thereof, and proton exchange film fuel cell

Examples

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Embodiment 1

[0057] In this example, the preparation of the gas diffusion layer for the proton exchange membrane fuel cell is carried out.

[0058] First, the carbon fiber paper is completely immersed in 5wt% polytetrafluoroethylene (PTFE) emulsion, ultrasonically dispersed evenly, placed in an oven at a temperature of 75 ° C for 0.5h and weighed, repeating this step until the content of the PTFE emulsion in the carbon fiber paper It accounts for 5% of the total mass; the dried carbon fiber paper is placed in a muffle furnace, and sintered at a temperature of 375°C for 0.5h to obtain a hydrophobic treated base layer.

[0059] The PTFE emulsion (5wt%) of the Vulcan XC-72 carbon black of 20mg and 100mg is joined in 25mL dehydrated alcohol solvent, ultrasonic dispersion 1h to form uniform conductive carbon slurry; Conductive carbon slurry is placed in oven, in At 80°C, dry for 6 hours; add 2mL of absolute ethanol to the dried conductive carbon mixture for wetting, gather the conductive carbon...

Embodiment 2

[0062] In this example, the preparation of the gas diffusion layer for the proton exchange membrane fuel cell is carried out.

[0063] First, completely immerse the carbon fiber woven cloth into 5wt% polyvinylidene fluoride emulsion (PVDF) emulsion, ultrasonically disperse it evenly, dry it in an oven at 75°C for 0.5h and weigh it, repeat this step until the PVDF in the carbon fiber woven cloth The content of the emulsion accounts for 10% of the total mass; the dried carbon fiber weave is arranged in a muffle furnace, and sintered at a temperature of 375°C for 0.5h to obtain a hydrophobic treated base layer.

[0064] 20mg of graphene powder and 100mg of PVDF emulsion (5wt%) were added to 25mL of absolute ethanol solvent and ultrasonically dispersed for 1h to form a uniform conductive carbon slurry; the conductive carbon slurry was placed in an oven at a temperature of 90°C and dry for 5 hours; add 2 mL of absolute ethanol solvent to the dried conductive carbon mixture for wett...

Embodiment 3

[0067] In this example, the preparation of the gas diffusion layer for the proton exchange membrane fuel cell is carried out.

[0068] First, the porous wire mesh is completely immersed in 5wt% polypropylene (PP) emulsion, ultrasonically dispersed evenly, placed in an oven at a temperature of 75°C for 0.5h and weighed, repeating this step until the PTFE emulsion in the porous wire mesh The content of the content accounts for 15% of the total mass; the dried porous wire mesh is placed in a muffle furnace, and sintered at a temperature of 375°C for 0.5h to obtain a hydrophobic treated base layer.

[0069] Add 20mg of acetylene black carbon powder and 180mg of PP emulsion (5wt%) into 25mL of absolute ethanol solvent, ultrasonically disperse for 1h to form a uniform conductive carbon slurry, wherein the average particle size of acetylene black is 30-45nm, The specific surface area is 55~70m 2 / g; put the conductive carbon slurry in an oven, and dry it at 80°C for 6 hours; add 2mL...

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Abstract

The invention belongs to the technical field of a proton exchange film fuel cell and particularly relates to a gas diffusion layer for the proton exchange film fuel cell and a preparation method thereof, and the proton exchange film fuel cell. The gas diffusion layer includes a base layer and a microporous layer, wherein the microporous layer is a sheet-like structure, and the base layer is laminated and connected with the microporous layer. The gas diffusion layer is advantaged in that the microporous layer is the sheet-like structure, the base layer is laminated and connected with the microporous layer, a problem that the preparation slurry leaks into the interior of the base layer to easily block the base layer and block a gas transmission passage during wet preparation of the microporous layer is solved, the gas diffusion layer is made to have better gas transmission capacity, moreover, the microporous layer is the sheet-like structure and can provide a flat surface, and contact ofthe gas diffusion layer with a catalytic layer is improved.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cells, and in particular relates to a gas diffusion layer for a proton exchange membrane fuel cell, a preparation method thereof and a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell is the fifth-generation fuel cell developed after alkaline fuel cell, phosphoric acid fuel cell, molten carbonate fuel cell and solid oxide fuel cell. Due to the use of solid electrolyte polymer membrane as electrolyte, It has the characteristics of high energy conversion rate, low-temperature start-up, and no electrolyte leakage, so it is recognized as the most promising power source for aerospace, military, electric vehicles, and regional power stations. [0003] The electrode of proton exchange membrane fuel cell is composed of gas diffusion layer, catalytic layer and proton exchange membrane. Among them, the gas diffusion layer plays an im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/1007
CPCH01M4/8605H01M4/8807H01M2008/1095H01M8/1007Y02E60/50
Inventor 党岱曾燃杰陈兴威吴传德刘全兵
Owner GUANGDONG UNIV OF TECH
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