Simple and green fabrication of a biomass-derived N and O self-doped hierarchical porous carbon via a self-activation route for supercapacitor application

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