Method for preparing slurry for catalyst coating membrane electrode of proton exchange membrane fuel cell

Abstract

The invention discloses a method for preparing slurry for a catalyst coating membrane electrode of a proton exchange membrane fuel cell. The method is characterized in that: the slurry has uniform dispersion and good stability, is not easy to settle, can be used for preparing the electrode by a method of spraying, brushing, blade coating, silk screen printing and the like, and is suitable for mechanized production. The electrode slurry contains a catalyst, proton exchange resin, a dispersant and an auxiliary agent added in a ratio; and the preparation method comprises four processes of material adding, dispersion, concentration and activating treatment. Because the slurry contains a thickening agent or a stabilizing agent, the slurry has good stability and is not easy to settle after dispersion, concentration and activating treatment. The catalyst coating membrane electrode prepared by adopting the electrode slurry has good discharge performance, and the electrode slurry is suitable for preparing the electrode by a process of spraying, brushing, blade coating, silk screen printing and the like.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a preparation method of a catalyst coating membrane electrode of a proton exchange membrane fuel cell, in particular to a preparation method of a catalyst coating membrane electrode slurry. Background technique [0002] Electrode is a key component of fuel cell and an important factor affecting the performance of fuel cell. To improve fuel cell performance and reduce the amount of noble metal platinum used as a fuel cell catalyst, researchers have investigated various electrode structures. At present, the catalyst-coated membrane electrode (CCM) structure is commonly used, that is, the catalytic layer is made on the proton exchange membrane to separate the catalytic layer from the gas diffusion layer (GDL). Since the catalyst-coated membrane electrode closely connects the catalytic layer and the proton exchange membrane, and the catalytic layer does not contain...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of the prior art is that the stability of the electrode slurry is poor, and it will settle after a short period of time. After two or three hours, the slurry will be stratified. The upper layer is a clear solvent, and the lower layer is a mixture of catalyst and ion exchange resin.

The continuous production of electrodes using such electrode slurry will lead to uneven catalyst loading

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