To meet the increased performance and cost requirements of commercial supercapacitor, a N and O self-doped hierarchical porous carbon is fabricated via a green and simple self-activation route utilizing leaves of wild hollyhock as raw materials. Comparing to commercial activated carbon, the reported material exhibits some marked merits, such as simple and green fabrication process, low cost, and superior capacitance performance. The specific surface area of the obtained N and O co-doped hierarchical porous carbon arrives 954 m² g⁻¹, and the content of the self-doped nitrogen and oxygen reaches 2.64 at.% and 7.38 at.%, respectively. The specific capacitance of the obtained material reaches 226 F g⁻¹ while the specific capacitance of the symmetric supercapacitor arrives 47.3 F g⁻¹. Meanwhile, more than 90.3% of initial specific capacitance is kept under a current density of 20 A g⁻¹, and no arresting degradation is observed for capacitance after 5000 times cycle, perfectly demonstrating the excellent cycle and rate capability of the obtained material. The obtained N and O co-doped hierarchical porous carbon are expected to be an ideal substitution for commercial activated carbon.

为了满足商业超级电容器不断增长的性能和成本要求，利用野生蜀葵叶作为原料，通过绿色和简单的自激活途径制备了N和O自掺杂的分级多孔碳。与商用活性炭相比，所报道的材料具有一些显着的优点，例如简单，绿色的制造工艺，低成本和出色的电容性能。所获得的N和O共掺杂的分级多孔碳的比表面积达到954 m ²  g ^-1，并且自掺杂氮和氧的含量分别达到2.64 at。％和7.38 at。％。所得材料的比电容达到226 F g ^-1对称超级电容器的比电容达到47.3 F g ^-1。同时，在20 A g ^-1的电流密度下保持超过90.3％的初始比电容，并且在5000次循环之后未观察到电容的阻滞退化，这完美证明了所获得材料的出色循环性能和倍率性能。预期获得的N和O共掺杂的分级多孔碳将是商业活性炭的理想替代品。