A kind of preparation method of fuel cell membrane electrode catalytic layer

Abstract

The invention provides a method for preparing a fuel cell membrane electrode catalyst layer. The fuel cell membrane electrode catalyst layer includes a cathode catalyst layer and an anode catalyst layer prepared on both sides of a substrate, and both the cathode catalyst layer and the anode catalyst layer are the catalyst layer slurry Coated on the surface of the substrate, dried and post-treated on the catalytic layer, the catalytic layer slurry of the cathode catalytic layer includes a catalyst containing ferromagnetic elements, and a magnetic field is applied during the post-treatment of the catalytic layer of the cathode catalytic layer, so that the slurry containing ferromagnetic The catalyst of the element moves in the cathode catalytic layer to realize the in-situ regulation of the pore structure of the cathode catalytic layer, increase the porosity of the catalytic layer, and promote the mass transfer of the reaction gas in the catalytic layer; in addition, there are many controllable parameters in the magnetic field adjustment process, and the process is simple , will not cause pollution to the catalytic layer, and in commercial application, it only needs to be equipped with an additional magnetic field adjustment device on the existing production line, and the modification to the existing process system is small, and it is easy to promote.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells, and in particular relates to a method for preparing a catalytic layer of a fuel cell membrane electrode. Background technique [0002] Proton Exchange Membrane Fuel Cells (PEMFC) have outstanding advantages such as low operating temperature, high power density, fast start-up speed, and zero emissions. The application prospect is an important direction for the sustainable development of energy in the future. [0003] In the PEMFC cell stack, the membrane electrode (Membrane Electrode Assembly, MEA) is the core component of the system for external energy output, consisting of a proton exchange membrane, a catalytic layer (Catalyst Layer, CL) coated on both sides of the proton exchange membrane surface gas diffusion layer. Among them, the catalytic layer is the place where the electrochemical reaction of the fuel cell occurs, and is composed of an ionic polymer, a catalyst and a ...

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Problems solved by technology

The above method also increases the complexity and production cost of the membrane electrode preparation process. At the same time, the processing time for vacuum removal of solvent is as long as several hours, which is not conducive to the efficient production of membrane electrodes.

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