CATHODE CATALYTIC LAYER STRUCTURE FOR ENHANCING CATALYST DURABILITY AND PREPARATION METHOD THEREFOR

摘要

The present invention relates to the technical field of fuel cells, and disclosed is a fuel cell cathode catalytic layer structure for enhancing catalyst durability. The structure comprises a first catalytic section, a second catalytic section and a third catalytic section arranged in order from a region close to the diffusion layer side to a region close to the proton exchange membrane side; the first catalytic section, the second catalytic section, and the third catalytic section are internally provided with pure platinum catalysts; platinum loadings of the pure platinum catalysts at the inner parts of the first catalytic section, the second catalytic section and the third catalytic section decrease in order; the average particle sizes of the pure platinum catalyst particles at the inner parts of the first catalytic section, the second catalytic section, and the third catalytic section increase in order; the pure platinum catalyst that has a large diameter is more resistant to corrosion, and the pure platinum catalyst that has small diameter improves the initial performance of a fuel cell, which facilitates reducing the specific surface area loss of the catalyst under potential sweeping; and the platinum specific surface area and platinum mass distribution of an attenuated cathode catalyst are more uniform, which facilitates reducing the attenuated oxygen and proton mass transfer loss, thereby improving the attenuated fuel cell performance and improving the durability.