Transition layer slurry for membrane electrode and preparation method thereof, and membrane electrode and preparation method thereof

Abstract

The invention provides transition layer slurry for a membrane electrode. The transition layer slurry comprises an ionomer, heteropolyacid, an anti-reverse oxide and a solvent, wherein the mass of theionomer is 5-20%, the mass of the heteropolyacid is 0-15% of the mass of the ionomer and does not include 0, the mass of the anti-reverse oxide accounts for 0-10% of the mass of the ionomer and does not include 0, the solvent is composed of deionized water, ethanol and ethylene glycol, the mass of the ethylene glycol accounts for 5-10% of the total mass of the solvent, the sum of the mass of the deionized water and the mass of the ethanol accounts for 90-95% of the total mass of the solvent, and the deionized water and the ethanol are mixed in any proportion. The invention further provides a preparation method of the transition layer slurry. Meanwhile, the invention further provides a membrane electrode prepared from the transition layer slurry and a preparation method of the membrane electrode. The transition layer slurry for the membrane electrode is simple and novel in composition and simple in preparation method, and the membrane electrode prepared from the transition layer slurrycan eliminate a gap between a catalyst layer and a proton exchange membrane, improve the proton conduction performance and reduce the anti-pole effect.

Description

technical field [0001] The invention relates to a transition layer slurry for a membrane electrode and a preparation method thereof, and also relates to a membrane electrode made by using the transition layer slurry for a membrane electrode of the invention and a preparation method thereof. Background technique [0002] At present, one of the main ways to mass-produce the fuel cell membrane electrode catalyst layer is to directly coat the catalyst layer on the surface of the proton membrane by using a slot die method. This method has the advantages of fast preparation speed, high precision and good consistency, so it is widely used. However, there are certain defects in preparing the catalyst layer directly on the proton exchange membrane. Since the catalyst layer is directly prepared on the proton exchange membrane, after the catalyst slurry is dried, a certain degree of cracks will appear between the catalyst layer and the proton exchange membrane, resulting in contact. i...

AI Technical Summary

Problems solved by technology

However, there are certain defects in preparing the catalyst layer directly on the proton exchange membrane. Since the catalyst layer is directly prepared on the proton exchange membrane, after the catalyst slurry is dried, a certain degree of cracks will appear between the catalyst layer and the proton exchange membrane, resulting in contact. insufficient

During the use of the fuel cell, the gap between the catalyst layer and the proton exchange membrane will cause three adverse effects on the membrane electrode: (1) The gap between the catalyst layer and the proton exchange membrane will cause the accumulation of reaction water, making the membrane Insufficient local reaction gas at the electrode will cause reverse pole phenomenon, which will lead to degradation and damage of membrane electrode materials, especially proton exchange membrane materials; (2) The gap between the catalyst layer and the proton exchange membrane will cause the contact between the catalyst layer and the proton exchange membrane Sufficiently, the proton conduction resistance increases, which affects the output performance of the membrane electrode; (3) The gap between the catalyst layer and the proton exchange membrane will cause the catalyst layer to fall off from the proton exchange membrane, which will affect the durability of the membrane electrode