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Method for preparing gas diffusion layer carbon paper through continuous coating at low cost

A gas diffusion layer, low-cost technology, applied in the direction of electrical components, textiles, papermaking, circuits, etc., can solve the problems of difficult batch production supply, complex preparation process, high production energy consumption, etc., to achieve easy large-scale continuous production, preparation The effect of simple process and low cost

Inactive Publication Date: 2021-02-05
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the defects of the existing carbon paper used in the gas diffusion layer of fuel cells, such as complex preparation process, high production energy consumption, high cost, brittleness, and difficulty in mass production and supply, the present invention proposes a low-cost preparation of gas diffusion layer by continuous coating. The method of layering carbon paper, thus realizing low energy consumption and large-scale production while improving the mechanical and electrical properties of carbon paper

Method used

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  • Method for preparing gas diffusion layer carbon paper through continuous coating at low cost
  • Method for preparing gas diffusion layer carbon paper through continuous coating at low cost
  • Method for preparing gas diffusion layer carbon paper through continuous coating at low cost

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Embodiment 1

[0031] (1) Disperse methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, conductive carbon material, inorganic fiber, and tackifier evenly to obtain a slurry; the conductive carbon material is carbon fiber; the inorganic fiber is sea foam stone fiber; the tackifier is hydroxypropyl methylcellulose ether with a mass concentration of 3%; in the preparation of slurry, ethanol, methyltrimethoxysilane, dimethyldimethoxysilane, conductive carbon materials, inorganic The mass ratio of fiber and tackifier is 100:8:8:50:25:3;

[0032] (2) Immerse the polytetrafluoroethylene non-woven fabric in the aluminum hydroxide sol to hang the film, then take it out and dry it, then spray the prepared slurry on the surface of the non-woven fabric, and then convey it by rollers, and then send it into the acid environment successively Treat with ammonia environment, form silica gel on the surface, make the sprayed slurry layer coagulate and solidify, obtain the non-woven fabric of coating slurr...

Embodiment 2

[0041] (1) Disperse methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, conductive carbon material, inorganic fiber, and tackifier evenly to obtain a slurry; the conductive carbon material is carbon nanotubes; the inorganic fiber is Glass fiber; hydroxypropyl methylcellulose ether with a mass concentration of 3% thickener; in the preparation of slurry, ethanol, methyltrimethoxysilane, dimethyldimethoxysilane, conductive carbon material, inorganic fiber , The mass ratio of tackifier is 100:5:5:40:20:2;

[0042] (2) Immerse the polytetrafluoroethylene non-woven fabric in the aluminum hydroxide sol to hang the film, then take it out and dry it, then spray the prepared slurry on the surface of the non-woven fabric, and then convey it by rollers, and then send it into the acid environment successively Treat with ammonia environment, form silica gel on the surface, make the sprayed slurry layer coagulate and solidify, obtain the non-woven fabric of coating slurry treatment; Th...

Embodiment 3

[0046] (1) Disperse methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, conductive carbon material, inorganic fiber, and tackifier evenly to obtain a slurry; the conductive carbon material is mesoporous carbon; the inorganic fiber is Ceramic fiber; hydroxypropyl methyl cellulose ether with a viscosity increaser mass concentration of 3%; in slurry preparation, ethanol, methyltrimethoxysilane, dimethyldimethoxysilane, conductive carbon material, inorganic fiber , The mass ratio of tackifier is 100:10:10:60:30:4;

[0047] (2) Immerse the polytetrafluoroethylene non-woven fabric in the aluminum hydroxide sol to hang the film, then take it out and dry it, then spray the prepared slurry on the surface of the non-woven fabric, and then convey it by rollers, and then send it into the acid environment successively Treat with ammonia environment, form silica gel on the surface, make the sprayed slurry layer coagulate and solidify, obtain the non-woven fabric of coating slurry trea...

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Abstract

The invention provides a method for preparing gas diffusion layer carbon paper through continuous coating at low cost. The gas diffusion layer carbon paper is prepared by the following steps: sprayingslurry prepared by mixing methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, a conductive carbon material, inorganic fibers and a tackifier on the surface of polytetrafluoroethylene non-wovenfabric subjected to aluminum hydroxide sol biofilm formation; continuously performing acid treatment and ammonia treatment to obtain non-woven fabric with a solidified spraying layer; and finally, ultrasonically atomizing and spraying a water repellent agent on the surface, and drying to obtain the gas diffusion layer carbon paper. According to the carbon paper prepared by the method provided by the invention, the conductive carbon material and the non-woven fabric are firmly bonded, the carbon material is uniformly dispersed and is fixed by the network of aerogel, the prepared carbon paper maintains better performance in the aspects of conductivity, strength, flexibility and uniform pore size distribution, and the preparation process is simple, easy for large-scale continuous production,low in energy consumption and low in cost.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for continuously coating low-cost gas diffusion layer carbon paper. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy through an electrochemical reaction. It is mainly composed of positive electrode, negative electrode, electrolyte and auxiliary equipment. Due to the advantages of high efficiency, fast start-up, and low pollution, fuel cells are considered to be the fourth power generation technology that is expected to provide a large amount of electric energy after wind power, water power and solar power. The two major problems of "energy shortage" and "environmental pollution" have been solved, and the diversification of energy sources has been realized. Proton exchange membrane fuel cell is a low-temperature fuel cell. In addition to the general characteris...

Claims

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Application Information

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IPC IPC(8): D06N3/18D06N3/12D06N3/04D06N3/00H01M4/88D06M11/45D06M101/22
CPCD06M11/45D06M2101/22D06N3/0011D06N3/0015D06N3/0043D06N3/0063D06N3/047D06N3/128D06N3/183D06N2201/0236D06N2209/041D06N2209/103D06N2209/142D06N2209/1642H01M4/8807Y02E60/50
Inventor 陈庆曾军堂司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD