A scaled-up proton exchange membrane fuel cell with enhanced performance and durability

•Developed an MEA design with enhanced performance and durability.•Conducted physical and electrochemical characterizations before and after ASTs.•Observed the positive impact of graphene flacks on cell performance and durability.•Observed the main degradation take places in the first 10,000 cycles of ASTs.•Observed the excellent performance and durability at low relative humidity after 30,000 cycles.