For MEA performance evaluation,research-scale test cells (active area of 50 cm2) were used, and the
operating conditions were 75C, 136 kPa, and 100% inlet RHs.Cathode ASTcycling was performed under the same conditions, butat 80C. Square wave potential cycling was performed with a lowerpotential limit (LPL) of 0.6 V for 30 s and an upper potential limit(UPL) of 1.3 V for 60 s.