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A method for preparing fuel cell membrane electrodes by inorganic in-situ bonding

A fuel cell membrane, in-situ technology, used in fuel cells, battery electrodes, circuits, etc., can solve problems such as easy falling off, and achieve the effects of high bonding strength, firm adhesion, and prevention of falling off

Active Publication Date: 2021-11-23
山东汉德自动化控制设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the defect that the catalyst layer, gas diffusion layer, and proton exchange membrane of the fuel cell membrane electrode, which are widely used at present, are easy to fall off in a humid and hot environment after being directly hot-pressed and composited, the present invention proposes an inorganic in-situ bonding preparation fuel cell The membrane electrode method effectively improves the bonding strength of the membrane electrode catalyst layer, the gas diffusion layer and the proton exchange membrane, and improves the stability of the membrane electrode in a hot and humid environment

Method used

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  • A method for preparing fuel cell membrane electrodes by inorganic in-situ bonding

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Embodiment 1

[0035] The preparation process is:

[0036] (1) Add carbon powder, urea, silica airgel, and adhesive into water, and mix evenly to obtain a carbon powder slurry; the adhesive is a PTFE adhesive; wherein, 27 parts by weight of carbon powder, urea 5 parts by weight, 21 parts by weight of silica airgel, 7 parts by weight of adhesive, 40 parts by weight of water;

[0037](2) Apply the carbon powder slurry prepared in step (1) evenly on the carbon fiber paper, then roll it flat and dry to obtain a gas diffusion layer; the carbon load of the gas diffusion layer is 1.9 mg / cm 2 ;

[0038] (3) Disperse the catalyst, sodium hydroxide with a molar concentration of 0.6mol / L, thickener, water and Nafion solution with a mass concentration of 7% to prepare a catalyst slurry; the catalyst is a Pt / C catalyst; thickening Agent is methyl cellulose; Wherein, 5 parts by weight of catalyst, 7 parts by weight of sodium hydroxide, 2 parts by weight of thickener, 35 parts by weight of water, 31 part...

Embodiment 2

[0042] The preparation process is:

[0043] (1) Add carbon powder, urea, silica airgel, and adhesive into water, and mix evenly to obtain a carbon powder slurry; the adhesive is SBR adhesive; wherein, 26 parts by weight of carbon powder, urea 5 parts by weight, 21 parts by weight of silica airgel, 6 parts by weight of adhesive, 42 parts by weight of water;

[0044] (2) Apply the carbon powder slurry prepared in step (1) evenly on carbon fiber paper, then roll it flat and dry to obtain a gas diffusion layer; the carbon load of the gas diffusion layer is 1.8 mg / cm 2 ;

[0045] (3) Disperse the catalyst, sodium hydroxide with a molar concentration of 0.6mol / L, a thickener, water and a Nafion solution with a mass concentration of 6% to prepare a catalyst slurry; the catalyst is a Pd / C catalyst; thickening The agent is hydroxypropyl methylcellulose; wherein, 5 parts by weight of catalyst, 7 parts by weight of sodium hydroxide, 1 part by weight of thickener, 36 parts by weight of ...

Embodiment 3

[0049] The preparation process is:

[0050] (1) Add carbon powder, urea, silica airgel, and adhesive into water, and mix evenly to obtain a carbon powder slurry; the adhesive is a CMC adhesive; wherein, 29 parts by weight of carbon powder, urea 6 parts by weight, 23 parts by weight of silica airgel, 7 parts by weight of adhesive, 35 parts by weight of water;

[0051] (2) Evenly coat the carbon powder slurry prepared in step (1) on carbon fiber paper, then roll it flat and dry to obtain a gas diffusion layer; the carbon load of the gas diffusion layer is 2.3mg / cm 2 ;

[0052] (3) Disperse the catalyst, sodium hydroxide with a molar concentration of 0.6mol / L, thickener, water and Nafion solution with a mass concentration of 5-10% to prepare a catalyst slurry; the catalyst is a Pt / C catalyst; Thickener is methyl cellulose; Wherein, catalyst 7 weight parts, sodium hydroxide 8 weight, thickener 3 weight parts, water 30 weight parts, Nafion solution 32 weight parts;

[0053] (4) ...

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Abstract

The invention provides a method for preparing fuel cell membrane electrodes by inorganic in-situ bonding. Coat the carbon powder slurry made of carbon powder, urea, silica aerogel, and adhesive on carbon fiber paper to make a gas diffusion layer, then add catalyst, sodium hydroxide, thickener, water and The catalyst slurry made of Nafion solution is coated on the carbon-carrying interface of the gas diffusion layer, and then hot-pressed with the upper and lower sides of the proton exchange membrane coated with aluminum oxyhydroxide and Nafion solution to obtain the fuel cell membrane electrode. In this method, silica airgel is added to the carbon-carrying layer, and the silica can firmly bind the catalyst in situ to prevent falling off. At the same time, aluminum hydroxide is formed on the surface of the proton exchange membrane and the catalyst layer in situ. The exchange membrane has high bonding strength, and the prepared membrane electrode uses inorganic in-situ bonding, which better retains micropores, firmly adheres, and is not affected by the wet environment and deteriorates.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to the preparation of membrane electrodes, in particular to a method for preparing fuel cell membrane electrodes by inorganic in-situ bonding. Background technique [0002] A fuel cell is a high-efficiency power generation device that directly converts hydrogen, natural gas and other fuels and oxidants into electrical energy through electrochemical reactions without combustion. In addition to the high energy conversion rate of fuel cells, the biggest advantage of fuel cells is that hydrogen fuel reserves are abundant, clean, environmentally friendly, and renewable. Currently, proton exchange membrane fuel cells (also known as hydrogen fuel cells) are mainly used in fuel cell vehicles, which use pure hydrogen as fuel and have high energy conversion efficiency, low noise, no pollution, long life, fast start-up, large specific power and output. Power can be adjusted at any time and other per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/86H01M8/1004
CPCH01M4/8647H01M4/8668H01M4/8807H01M8/1004Y02E60/50
Inventor 曾军堂陈庆司文彬白涛
Owner 山东汉德自动化控制设备有限公司
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