Pore Structure Effect of Cathode Catalyst Layer on Performance and Durability of PEMFC

Abstract

Porosity and pore size of cathode catalyst layer was controlled by changing catalyst layer coating methods. Two-layered catalyst layer of dense and porous layers was also compared in order to get optimum porosity of catalyst layer in the view point of both performance and durability. Performance and durability of MEA’s with different porosity were compared and impedance and ECSA of them were analyzed. Porosity and pore size were measured and observed by mercury intrusion method and SEM images. Porous catalyst layer was generally favorable. However porosity of catalyst layer could be further advanced with two-layered structure of different pore structures.