▎ 摘　　要

Membranes play an important role in gas separation on account of their low cost, energy efficiency, and durability. Gas-separation membranes, however, are subject to permeability-selectivity trade-off, i.e., atomically thin 2D materials such as porous graphene can provide ultrahigh permeances in the range of similar to 10(5)-10(7) GPU but suffer from low gas selectivity. Here, we show a new concept to enhance the selectivity of graphene-based membranes by employing adsorptive separation for binary gas mixtures. The deposition of "microislands'' of Pd and Ni on the porous double-layer graphene support allowed us to selectively target H-2 in He/H-2 and CO2 in H-2/CO2 mixtures, respectively, thus enabling efficient separation of He and also leading to the highest H-2/CO2 separation factor of 26 within the similar to 10(5) GPU permeance range. Moreover, the selective targeting of individual gases in amembrane setting through adsorptive separation at room temperature can be a promising alternative for economical gas separation.