Manufacturing method of electrode catalyst layer, membrane electrode assembly using the same, fuel cell using the same and complex particles

摘要

The present invention provides a manufacturing method of an electrode catalyst layer which contains a catalyst, carbon particles and a polymer electrolyte, wherein an oxide type of non-platinum catalyst is used as the catalyst and a fuel cell employing the electrode catalyst layer achieves a high level of power generation performance. The manufacturing method of the electrode catalyst layer of the present invention includes at least: preparing a first catalyst ink, in which a catalyst, first carbon particles and a first polymer electrolyte are dispersed in a first solvent, drying the first catalyst ink to form complex particles, preparing a second catalyst ink, in which the complex particles, second carbon particles and a second polymer electrolyte are dispersed in a second solvent, and coating the second catalyst ink on a substrate to form the electrode catalyst layer.

主权项

1. A manufacturing method of an electrode catalyst layer for a fuel cell, the method comprising:
preparing a first catalyst ink in which at least an oxide type of non-platinum catalyst, first carbon particles and a first polymer electrolyte are dispersed in a first solvent; drying said first catalyst ink to form complex particles in which said catalyst and said first carbon particles are embedded in said first polymer electrolyte; performing a pretreatment in which said complex particles and second carbon particles are mixed together without any solvent before preparing a second catalyst ink; performing a heat treatment which said complex particles and said second carbon particles receive after performing said pretreatment and before preparing a second catalyst ink, wherein said complex particles and said second carbon particles receive said heat treatment without any solvent, and said heat treatment is performed at a temperature in the range of 50-180° C.; preparing said second catalyst ink in which said complex particles, said second carbon particles and a second polymer electrolyte are dispersed in a second solvent; and coating said second catalyst ink on a substrate to form an electrode catalyst layer.