Method for preparing gas diffusion layer of proton exchange membrane fuel cell

A gas diffusion layer and proton exchange membrane technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high cost of gas diffusion layers, limited application range, low conductivity, etc., and achieve superior battery performance and abundant sources. , the effect of low cost

Active Publication Date: 2019-04-05
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method for preparing a gas diffusion layer of a proton exchange membrane fuel cell, which is used to solve the technical problems of high cost, low electrical conductivity and limited application range of the gas diffusion layer in the prior art

Method used

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  • Method for preparing gas diffusion layer of proton exchange membrane fuel cell
  • Method for preparing gas diffusion layer of proton exchange membrane fuel cell
  • Method for preparing gas diffusion layer of proton exchange membrane fuel cell

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Embodiment 1

[0035] First cut the log into slices perpendicular to the growth direction of the tree, scrape and trim the bark on the periphery of the log, and dry it in an oven at 50°C for 24 hours; place the dried log in a muffle furnace and pre-heat it at 240°C Carbonize for 10 hours; place the pre-carbonized carbonized wood in a tube furnace, and carbonize for 1 hour at 1000°C in a nitrogen-filled environment; Soak the carbonized wood and ultrasonically disperse and clean the carbon powder remaining on the carbonized wood, place it in an oven to dry and weigh it; dilute the PTFE emulsion with a mass fraction of 60% with deionized water to obtain a water-repellent emulsion with a mass fraction of 5%; Soak the dried carbonized wood with 5% PTFE emulsion in turn, ultrasonically disperse for 10 minutes, dry and weigh until the load of PTFE emulsion accounts for 30% of the carbonized wood mass; place the soaked carbonized wood in a tube furnace Sinter at 375°C for 1 hour under a nitrogen-fil...

Embodiment 2

[0037] First cut the log into slices perpendicular to the growth direction of the tree, scrape and trim the bark on the periphery of the log, and dry it in an oven at 50°C for 24 hours; place the dried log in a muffle furnace and pre-heat it at 240°C. Carbonize for 10 hours; place the pre-carbonized carbonized wood in a tube furnace, and carbonize for 1 hour at 1000°C in a nitrogen-filled environment; Soak the carbonized wood and ultrasonically disperse and clean the carbon powder remaining on the carbonized wood, place it in an oven to dry and weigh it; dilute the PTFE emulsion with a mass fraction of 60% with deionized water to obtain a water-repellent emulsion with a mass fraction of 5%; Soak the dried carbonized wood with 5% PTFE emulsion in turn, ultrasonically disperse for 10 minutes, dry and weigh until the load of PTFE emulsion accounts for 20% of the mass of carbonized wood; place the soaked carbonized wood in a tube furnace Sinter at 375°C for 1 hour under a nitrogen...

Embodiment 3

[0039]First cut the log into slices perpendicular to the growth direction of the tree, scrape and trim the bark around the log, and dry it in an oven at 50°C for 24 hours; place the dried log in a muffle furnace for pre-carbonization at 240°C 10 hours; place the pre-carbonized carbonized wood in a tube furnace, and carbonize it at 1000°C for 1 hour in a nitrogen-filled environment; trim the carbonized wood to 0.3mm with a cutting tool, and soak it in absolute ethanol The carbonized wood is ultrasonically dispersed and cleaned to clean the remaining carbon powder on the carbonized wood, placed in an oven to dry and weighed; the PTFE emulsion with a mass fraction of 60% is diluted with deionized water to obtain a water-repellent emulsion with a mass fraction of 5%; Soak the dried carbonized wood with 5% PTFE emulsion, ultrasonically disperse for 10 minutes, dry and weigh until the load of PTFE emulsion accounts for 10% of the mass of carbonized wood; place the soaked carbonized w...

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Abstract

The invention relates to the technical field of fuel cells, in particular to a method for preparing a gas diffusion layer of a proton exchange membrane fuel cell. The method for preparing the gas diffusion layer of the proton exchange membrane fuel cell, which is provided by the invention, includes the following steps: dehydrating a log; performing first carbonization and second carbonization forthe dehydrated log; finishing the log carbonized by the second carbonization; soaking the carbonized by an anhydrous ethanol solution, and performing ultrasonic dispersion and drying; soaking the dried carbonized log by a water repellent emulsion; placing the processed carbonized log in a tube furnace, and sintering a water repellent in a nitrogen filled environment; adding conductive carbon powder and the water repellent emulsion to an alcohol solvent to form a uniform carbon power slurry; coating the carbon power slurry on the surface of the carbonized log having been subjected to hydrophobic treatment to form a substrate having a micro-porous layer, and sintering the substrate to obtain a gas diffusion layer. The preparation method provided by the invention solves technical problems ofhigh cost, low conductivity and limited application scope of the prior art.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for preparing a gas diffusion layer of a proton exchange membrane fuel cell. Background technique [0002] With the continuous depletion of fossil energy, it is imminent to find new alternative energy. Because proton exchange membrane fuel cell (PEMFC) has the advantages of small system volume, high energy density, clean and pollution-free, no complicated air supply and humidification system, etc., it has attracted the attention of the industry. The core assembly (MEA) of a proton exchange membrane fuel cell (PEMFC) consists of a gas diffusion layer, a catalytic layer and a proton exchange membrane. The gas diffusion layer (GDL) is located between the catalytic layer and the flow field. Its role is to support the catalytic layer and stabilize the electrode structure. At the same time, it must have excellent gas permeability and the function of removing the moisture g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86H01M4/96
CPCH01M4/8605H01M4/8885H01M4/96Y02E60/50
Inventor 党岱吴传德曾燃杰陈兴威安璐刘倚君李嘉韵
Owner GUANGDONG UNIV OF TECH
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