Graphene becomes a promising electrode material for supercapacitor because of their high theoretical specific surface area and good conductivity. Nevertheless, the main disadvantage of graphene is the irreversible agglomeration because of the strong interlayer van der Waals force, which is significantly decreases the surface area, thus resulting in poor electrochemical performance. Herein, we report a new and facile strategy to synthesize rich oxygen-containing porous graphene (OPG) using KMnO₄ as activator precursor. The optimized OPG-600 samples possess crumpled porous framework with a suitable surface area and massive oxygen-containing functional groups. Benefiting from their synergistic influence, the OPG-600 electrode displays a high gravimetric and volumetric capacitance of 363.3 F g⁻¹ and 342.5 F cm⁻³ at 0.5 A g⁻¹ and good rate performance (240 F g⁻¹ and 226.3 F cm⁻³ at 30 A g⁻¹). More interestingly, the OPG-600 symmetric supercapacitor displays a high volumetric energy density of 19.2 Wh L⁻¹ and superior electrochemical stability.

石墨烯因其高理论比表面积和良好的导电性而成为一种很有前途的超级电容器电极材料。然而，石墨烯的主要缺点是由于强大的层间范德华力导致不可逆团聚，这显着降低了表面积，从而导致较差的电化学性能。在此，我们报告了一种使用 KMnO ₄作为活化剂前体合成富氧多孔石墨烯 (OPG) 的新且简便的策略。优化的 OPG-600 样品具有皱缩的多孔骨架，具有合适的表面积和大量含氧官能团。受益于它们的协同作用，OPG-600 电极显示出 363.3 F g ^-1的高重量和体积电容和 342.5 F cm ^-3在 0.5 A g ^-1和良好的倍率性能（240 F g ^-1和 226.3 F cm ^-3在 30 A g ^-1）。更有趣的是，OPG-600 对称超级电容器显示出 19.2 Wh L ^-1的高体积能量密度和优异的电化学稳定性。