▎ 摘　　要

Porous graphene materials (PGMs) have been fabricated through CO2 and KOH activation of thermal exfoliated graphite oxide. The CO2 activated PGMs (CPGMs) display a three-dimensional morphology with hierarchical pore structure, while the KOH activated PGMs (KPGMs) exhibit a two-dimensional sheet morphology with numerous micropores and small mesopores. By adjusting the activation conditions, their specific surface areas and pore volumes can be easily tuned in a wide range. Moreover, the as-prepared PGMs show various surface chemistry, in which the CPGMs own a high content of quinone and carbonyl groups, and the KPGMs possess abundant hydroxyl groups. Gas adsorption experiments demonstrate that CO2 and H-2 uptakes of PGMs are affected by both their pore structure and surface chemistry. Notably, the KPGMs-7 has the highest CO2 uptake of 17.87 wt% (4.06 mmol g(-1)) at 273 K and 1 bar and H2 uptake of 2.41 wt% (11.88 mmol g(-1)) at 77 K and 1 bar, respectively.