Proton exchange membrane fuel cell slurry capable of improving dispersity of ionomers in catalyst slurry and preparation method thereof

Abstract

The invention relates to proton exchange membrane fuel cell slurry capable of improving dispersity of ionomers in catalyst slurry and a preparation method thereof. The method comprises the steps that a fractional step method is adopted, firstly, a catalyst and water are added and dispersed to prepare catalyst turbid liquid, then alcohol and a perfluorosulfonic acid resin solution are dispersed to prepare an ionomer solution, and finally, the ionomer solution is divided into three parts, sequentially the three parts are added into the catalyst turbid liquid, and sequentially dispersed to prepare the proton exchange membrane fuel cell catalyst slurry. Compared with the prior art, the method has the advantages that non-adsorbed ionomers in the catalyst slurry can be reduced, so that the ionomers are more uniformly adsorbed on the catalyst, meanwhile, the microstructure of an interface of a cluster catalyst / ionomer on a catalyst layer can be improved, a three-phase interface is increased, and the performance of the fuel cell is improved; in addition, the method is simple to operate, the preparation process is easy to control, and the prepared slurry is suitable for preparing roll-to-roll high-flux membrane electrodes for slit coating, brush coating and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of fuel cell catalyst slurry, relates to a proton exchange membrane fuel cell catalyst slurry and a preparation method thereof, in particular to a proton exchange membrane fuel cell slurry for improving the dispersibility of ionomers in catalyst slurry and its preparation method. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are considered to be one of the most promising renewable energy sources in the 21st century because of their high energy conversion rate and environmental protection. They have been used in transportation, housing, power stations and other fields. However, although fuel cell vehicles have come out, there is still a long way to go before real commercialization. Reducing platinum loading without sacrificing performance, especially on cathode catalytic layers, has been a challenge for the past decade. Membrane electrodes (MEAs) are key component...

AI Technical Summary

Problems solved by technology

In the slurry, these ionomers will spontaneously adsorb on the catalyst. However, these ionomers may not be evenly or completely adsorbed on the ionomer, so on the catalytic layer, the thickness of the ionomer covering the catalyst varies. One, it is also possible that the ionomer is not covered on the catalyst

The ionomer covers the catalyst too thick or the ionomer is not in contact with the catalyst, which will lead to a decrease in the redox reaction or a decrease in the three-phase interface, resulting in a decrease in the membrane electrode energy.

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