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Anode gas diffusion layer for prolonging service life of metal bipolar plate and preparation method thereof

A technology of metal bipolar plate and gas diffusion layer, which is applied in the direction of electrical components, battery electrodes, structural parts, etc., can solve the problems of reducing battery durability, changing catalyst activity, and reducing membrane proton conductivity, so as to prolong service life, The effect of prolonging life

Active Publication Date: 2019-10-08
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Corrosion leads to the degradation of battery performance because the metal ions produced by corrosion are absorbed by the proton exchange membrane, and the proton conductivity of the membrane is reduced; at the same time, the metal ions produced by corrosion enter the catalytic layer, changing the activity of the catalyst and reducing the durability of the battery

Method used

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  • Anode gas diffusion layer for prolonging service life of metal bipolar plate and preparation method thereof
  • Anode gas diffusion layer for prolonging service life of metal bipolar plate and preparation method thereof

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preparation example Construction

[0033] A method for preparing an anode gas diffusion layer for prolonging the service life of a metal bipolar plate, the method comprising the following steps:

[0034] Step 1. Add the dispersant to deionized water or distilled water, and form a uniform dispersant aqueous solution with a dispersant concentration of 0.1wt% to 2wt% through one or two dispersion methods;

[0035] Step 2, adding the conductive carbon material to the dispersant aqueous solution prepared in step 1, and forming a uniform conductive carbon material suspension through one or two dispersion methods;

[0036] Step 3, adding the water-repellent emulsion into the conductive carbon material suspension prepared in Step 2, and forming a microporous layer slurry containing a water-repellent concentration of 1 wt% to 60 wt% through one or two dispersion methods;

[0037] Step 4. The microporous layer slurry prepared in Step 3 is applied to one side of the hydrophobically treated support layer by one or more tha...

Embodiment 1

[0043]Add sodium lauryl sulfate and sodium isooctyl alcohol polyoxyethylene ether phosphate into distilled water, and mechanically stir for 2 hours to form a uniform dispersant solution with a concentration of 0.5 wt%; add activated carbon and carbon nanotubes In the above-mentioned dispersant aqueous solution, mechanically stir for 20 minutes to form a uniform conductive carbon material suspension; add polytetrafluoroethylene emulsion to the above-mentioned conductive carbon material suspension, and ultrasonically disperse for 1 minute to form a microparticle with a water-repellent concentration of 20 wt%. Porous layer slurry: Apply the above microporous layer slurry to the side of the hydrophobically treated support layer by scraping and spraying, first place it in a 105°C oven, heat it and weigh it, and then repeat this step until it is conductive The loading amount of the carbon material reaches 1.5mg / cm2 and the loading amount of the hydrophobic agent reaches 40% of the to...

Embodiment 2

[0046] Add polyvinylpyrrolidone to deionized water and stir mechanically for 1 hour to form a uniform dispersant solution with a concentration of 0.1 wt %; add conductive carbon black to the above aqueous dispersant solution and stir mechanically for 10 minutes to form a uniform conductive carbon Material suspension: adding polychlorotrifluoroethylene and polyvinylidene fluoride emulsion to the conductive carbon material suspension, mechanically stirring for 1 minute, and ultrasonically dispersing for 30 minutes to form a microporous layer slurry with a water repellent concentration of 1 wt%. Put the above-mentioned microporous layer slurry to the side of the hydrophobically treated support layer by means of suction filtration, first place it in a 100°C oven, heat and weigh it, and then repeat this step until the loading capacity of the conductive carbon material reaches 0.1 The loading amount of mg / cm2 and water-repellent agent reaches 60% of the total mass of water-repellent ...

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Abstract

The invention belongs to the technical field of a fuel cell and particularly relates to an anode gas diffusion layer for prolonging service life of a metal bipolar plate and a preparation method thereof. The anode gas diffusion layer includes a gas diffusion layer and a metal corrosion inhibitor layer based on the gas diffusion layer, wherein the gas diffusion layer is composed of a support layerand a microporous layer attached to one side of the support layer, the support layer is porous carbon paper and carbon cloth, and the microporous layer is prepared by mixing a conductive carbon material, water repellent, the water and / or dispersing agent and coating the mixture to a surface of the support layer. The method is advantaged in that the metal corrosion inhibitor is applied to the sidethe gas diffusion layer in contact with the anode metal bipolar plate, when the anode metal bipolar plate coating fails to expose a metal substrate, the metal corrosion inhibitor on the gas diffusionlayer is chemically adsorbed by the metal substrate, the anode metal bipolar plate is protected, the service life of the anode metal bipolar plate is extended, so the service life of a fuel cell stackis extended, and shortcomings of fuel cells in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to an anode gas diffusion layer for prolonging the service life of a metal bipolar plate and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a kind of fuel cell, and its main components are gas diffusion layer, catalytic layer, proton exchange membrane, bipolar plate, end plate and so on. Bipolar plates are also known as current collector plates. At present, there are three types of bipolar plates widely used: graphite plates, metal plates and composite material plates. Metal bipolar plates have advantages such as volume specific power density, electrical and thermal conductivity, and mass production costs. , occupying more and more market share. Due to the poor corrosion resistance of metal bipolar plates, the surface of metal bipolar plates is mostly modified. Surface modification technology prolongs the life of metal b...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M8/0234H01M8/0239H01M8/0245
CPCH01M4/8807H01M8/0245H01M8/0234H01M8/0239Y02E60/50
Inventor 朱雅男曹婷婷米新艳于力娜
Owner FAW JIEFANG AUTOMOTIVE CO
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