Method for improving sealing performance of membrane electrode

Abstract

The invention provides a method for improving the sealing performance of a membrane electrode. The method comprises the following steps: S1, wrapping a layer of inner frame on the outer surface of a proton exchange membrane; S2, respectively subjecting two opposite first outer surfaces of the inner frame and a cathode gas diffusion layer and an anode gas diffusion layer to hot pressing under a hotpress for combination to form membrane electrodes, wherein the hot pressing temperature of the hot press is 110-160 DEG C, the pressure of the hot press is 5-10 bar, and the hot pressing time of thehot press is from 30 seconds to 5 minutes; S3, wrapping two opposite second outer surfaces of the inner frame with a layer of outer frame; and S4, pasting a layer of sealing ring on the outer frame. According to the method, the inner frame is arranged at the periphery of the active region of the proton exchange membrane and then is hot-pressed with the gas diffusion layer, and the inner frame adopts a PI membrane, so that the cohesiveness is good, and the membrane electrode is good in air tightness; and meanwhile, the membrane electrode adopting the sealing mode is simple in structure and easyto manufacture, and industrialization is easy to realize.

Description

technical field [0001] The present application relates to the field of fuel cells, in particular to a method for improving the sealing performance of membrane electrodes. Background technique [0002] A proton exchange membrane fuel cell is a power generation device that converts chemical energy into electrical energy. The fuel cell chip is a catalyst / proton exchange membrane module prepared by coating the fuel cell catalyst on both sides of the proton exchange membrane, referred to as CCM (catalyst coated membrane). The core components of a proton exchange membrane fuel cell include a fuel cell catalyst layer, a CCM, an upper frame, a lower frame, and a gas diffusion layer. Usually, the fuel cell membrane electrode manufacturing process includes catalyst coating, frame bonding, and gas diffusion layer bonding. In order to facilitate the frame manufacturing, the proton membrane exchange membrane often needs to extend to the area outside the catalytic layer, and this part is...

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Problems solved by technology

[0004] One of the purposes of this application is to provide a method for improving the sealing performance of membrane electrodes, aiming at improving the existing problem of poor sealing performance of membrane electrodes

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