Preparation method of proton exchange membrane fuel cell membrane electrode

Abstract

The invention discloses a preparation method of a proton exchange membrane fuel cell membrane electrode, which is characterized by comprising the following steps: a, preparing a gas diffusion electrode by using catalyst ink and a gas diffusion layer; b, coating the surface of a catalyst layer of the gas diffusion electrode with a perfluorosulfonic acid diluent with the concentration of 0.5 wt%-1wt%, and drying the gas diffusion electrode at 90-120 DEG C for 30-60 minutes; and c, fitting the surfaces, coated with the perfluorosulfonic acid, of the two gas diffusion electrodes with the two sidesof the solid electrolyte respectively, and performing hot pressing to obtain the membrane electrode. According to the invention, the surface of the catalyst layer is coated with a Nafion diluent; themembrane and the proton exchange membrane have the same substance and different substance states; in the hot pressing process, Nafion resin on the surface of the catalyst layer and Nafion resin in the proton exchange membrane are reconstructed in physical state and are fused and combined, so that the catalyst layer and the proton exchange membrane are better combined into a whole, the contact performance between the catalyst layer and the proton exchange membrane is improved, the contact resistance is reduced, and the power generation performance is improved.

Description

technical field

[0001] The invention relates to a fuel cell, in particular to a method for preparing a membrane electrode of a proton exchange membrane fuel cell. Background technique

[0002] The proton exchange membrane fuel cell is an energy conversion device that converts the chemical energy stored in the fuel into electrical energy. The membrane electrode assembly (MEA) is the core component of the proton exchange membrane fuel cell. The performance of the membrane electrode assembly is largely It directly determines the pros and cons of proton exchange membrane fuel cells.

[0003] The membrane electrode consists of two gas diffusion electrodes, the cathode and the anode, and a solid electrolyte separating the two electrodes. Solid electrolytes generally use perfluorosulfonic acid membrane materials, and DuPont's registered Nafion series products are representative of proton exchange membranes. Such as figure 1 As shown, the gas diffusion electrode 10 is divided int...

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