Method for preparing fuel cell membrane electrode through inorganic in-situ bonding

Abstract

The invention provides a method for preparing a fuel cell membrane electrode through inorganic in-situ bonding. Carbon fiber paper is coated with carbon powder slurry prepared from carbon powder, urea, silicon dioxide aerogel and an adhesive, a gas diffusion layer is prepared, then a carbon-carrying interface of the gas diffusion layer is coated with catalyst slurry prepared from a catalyst, sodium hydroxide, a thickening agent, water and a Nafion solution, and the carbon-carrying interface of the gas diffusion layer is coated with carbon powder slurry prepared from carbon powder, urea, silicon dioxide aerogel and an adhesive. And then laminating and hot-pressing are performed on the upper surface and the lower surface of the proton exchange membrane which is mixed and coated with aluminumoxyhydroxide and a Nafion solution to obtain the fuel cell membrane electrode. According to the method, the silicon dioxide aerogel and the silicon dioxide in-situ firm bonding catalyst are added into the carbon loading layer to prevent falling off, meanwhile, aluminum hydroxide bonding is formed in situ on the surface of the proton exchange membrane and the catalyst layer, the bonding strength of the catalyst layer and the proton exchange membrane is high, the prepared membrane electrode adopts inorganic in-situ bonding, micropores are well reserved, Adhesion is firm, and degradation causedby the influence of the wet environment is avoided.

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...

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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

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