Facile Synthesis of Bagasse-Based Hierarchical Porous Carbon for High-Efficiency Supercapacitors

The growth of sustainable energy storage drives the need for advanced supercapacitors. Porous carbon materials obtained from biomass resources are promising electrode candidates owing to their cost effectiveness and structural tunability. We propose an efficient conversion strategy by synergistically integrating N/O/V heteroatom doping with KOH activation, using waste sugarcane bagasse as the precursor. The prepared porous carbon material a unique wrinkled worm-like nanoporous sheet morphology, with partial transformation into carbon spheres measuring 100–200 nm in size. The resulting material demonstrates an outstanding specific capacitance of 434.4 F g−1 at a current density of 1 A g−1. Additionally, the supercapacitor assembled with this material delivers an energy density of 21.0 Wh kg−1 at a power density of 250 W kg−1. This study outlines a feasible method for converting biomass waste into high-performance electrode materials.