Herein, we present several advances towards scaling up PG membranes for carbon capture. We demonstrate the successful use of a low-cost Cu foil (10 $/m 2 ) to prepare PG membranes with attractive CO2/N2 separation performance with a near 100% success rate. A simple protocol was developed to eliminate large contaminant particles on the surface of low-cost Cu foil. A large reactor for pore incorporation was implemented, which allowed the incorporation of uniform pores in large-area graphene (500 cm 2 ) in a reproducible manner. A systematic study of graphene oxidation revealed that O3 mass transfer (velocity), as opposed to reaction kinetics (temperature and time), which has been the focus of the literature, dominates pore formation kinetics. A facile and user-friendly transfer protocol was developed, completely avoiding the floating step, resulting in a highly reproducible synthesis. These interventions yielded attractive performance with a near 100% success rate from PG membranes.