Catalyst slurry for proton exchange membrane fuel cells and preparation method thereof

Abstract

The invention belongs to the technical field of fuel cell catalysts, and particularly relates to catalyst slurry for proton exchange membrane fuel cells and a preparation method thereof. The catalystslurry for proton exchange membrane fuel cells comprises 5-30 wt% of catalyst particles, 0-20 wt% of a pore forming agent, 5-40 wt% of a high-molecular proton conductor polymer dispersion liquid and 1-90 wt% of a solvent, wherein the pore forming agent is one or a mixture of more of oxalic acid, malic acid, citric acid and ethylenediamine tetraacetic acid, and the catalyst particles are platinum-containing catalyst particles or non-platinum catalyst particles. An organic acid is used as a main solvent, so that a catalyst layer is not easy to burn during drying. A low-boiling-point alcohol is adopted, and the low-boiling-point alcohol has a high dielectric constant and can well dissolve a high-molecular polymer proton conductor, so that the catalyst layer and a proton exchange membrane aretightly combined, and a prepared membrane electrode has low internal resistance. The solvent of the catalyst slurry is a medium-boiling-point solvent, the prepared catalyst layer has a stable structure and few cracks, and the catalyst layer has a long service life and high durability.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, and in particular relates to a catalyst slurry for proton exchange membrane fuel cells and a preparation method thereof. Background technique [0002] Membrane electrodes in fuel cells are the core components, and their performance and cost determine the performance and cost of the entire fuel cell stack. The cost of the membrane electrode includes the cost of raw materials (membrane, catalyst, gas diffusion layer) and the cost of the catalyst coating process, and the catalyst coating process determines the performance of the membrane electrode. [0003] The catalyst coating on the fuel cell membrane electrode is made by dispersing solid catalyst particles into a solvent to make a catalyst slurry, adding a perfluorosulfonic acid resin solution, coating the slurry on the proton exchange membrane, and then drying it into a It can also be made into a catalyst slurry by dispersing solid ...

AI Technical Summary

Problems solved by technology

Because this high-boiling-point solvent has a strong solubility for perfluorosulfonic acid resin, the catalytic layer prepared by it is closely combined with the proton exchange membrane, and this slurry will not burn when it is dried at 80~140°C. The disadvantage is that the solvent boiling point Higher, higher temperature required for drying

[0006] In the process of producing membrane electrodes by spraying process, the solvent is required to volatilize quickly. Generally, low-boiling point solvents are used to prepare catalyst slurry. Solvent water, this kind of slurry can be dried at a lower temperature, the disadvantage is that it is easy to burn, and the prepared catalytic layer has more cracks

[0007] Most of the above catalyst slurries are organic solvents, and the organic solvents used are relatively toxic, require relatively high operating environment, and have high pressure on environmental protection

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