A preparation process of hydrogen fuel cell membrane electrode

Abstract

The invention discloses a preparation process of a hydrogen fuel battery membrane electrode, and belongs to the field of battery membrane electrodes. The membrane electrode is prepared by the aid of an ultrasonic spraying process and a heat transfer printing process. The preparation process includes the steps: firstly, sequentially spraying a transfer printing medium with carbon powder slurry, electric catalyst slurry and binding agent slurry by the aid of the ultrasonic spraying process; secondly, loading a catalyst layer on a proton exchange membrane by the aid of the heat transfer printing process; finally, performing hot-pressing for self-made diffusion layers by the aid of the ultrasonic spraying process to obtain the membrane electrode. According to the preparation process, the diffusion layers are closely combined by the aid of actions among Nafion slurry, the proton exchange membrane and carbon powder slurry and the diffusion layers, electrochemical performance of the membrane electrode is greatly improved by the aid of the heat transfer printing process, the service life of the membrane electrode is prolonged, the problems such as wrinkle and swelling of the proton exchange membrane are solved, a lot of time for paving and treating the membrane is saved, and mass production of the membrane electrode is facilitated.

Description

technical field [0001] The invention discloses a preparation process of a hydrogen fuel cell membrane electrode, which belongs to the field of battery membrane electrodes. Background technique [0002] The traditional membrane electrode preparation method, that is, the GDE method, is mainly to coat the catalyst on the diffusion layer to form a catalytic layer, and then heat-press the diffusion layer, catalytic layer and proton exchange membrane together through high temperature and high pressure and a certain period of time through a hot pressing process. , forming a membrane electrode. Afterwards, through the development of science and technology, the preparation of the membrane electrode directly transfers the catalytic layer to the proton exchange membrane to form a CCM, which is then hot-pressed with the diffusion layer to form a membrane electrode. The traditional membrane electrode preparation method, that is, the GDE method, prevents the catalyst from being tightly c...

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Problems solved by technology

However, the problem with this method is that the catalyst is affected by temperature and pressure so that the adhesion strength on the film cannot be controlled, and the catalyst on the side of the film and the transfer medium cannot be completely transferred to the film due to uneven force during hot pressing. On the membrane, thereby reducing the utilization rate of the catalyst; at the same time, the transfer medium is often deformed due to hot pressure and cannot be reused, which increases the cost of membrane electrode manufacturing

[0005] It can be seen that there are many processes for preparing membrane electrodes by transfer printing, spraying, etc. in the prior art, but there are still many deficiencies, which affect the utilization rate of the catalyst and limit the electrochemical performance of the fuel cell.

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