▎ 摘　　要

Porous nanocarbons have been established as materials of choice in the manufacturing of microporous layers (MPLs) for proton-exchange membrane fuel cells (PEM FCs). However, obtaining mechanically and chemically stable materials at competitive yield-to-cost ratios still remains a critical objective, with pyrolytic techniques having shown great promise for bulk material production. A recent advancement in the field, the acclaimed laser-induced graphene (LIG) method employs low-cost industrial engravers for the laser pyrolysis of polymeric substrates into graphene-based foams with distinctive 3D porous networks. In this work, we apply the LIG method on polyimide precursors to obtain surface-patterned hydrophobic graphene foams, and we develop a low-temperature decal method (LTD-LIG) for the direct transfer of non-sacrificial platinum-coated LIG on Nafion (R) membranes to serve as the MPL in PEM FCs. Obtained by a readily scalable and inexpensive manufacturing method, the assembled LIG-based FC prototype overcomes the water management and mechanical stability problems typically encountered by graphene-based MPLs to present impeccable fuel crossover and power performance at 888.33 mW cm(-2) mg(-1) of anodic Pt load at 80 degrees C and 80% RH, delivering a 20% increase in power density compared to a reference FC bearing a commercial carbon black MPL assembled with the same loadings.