Palm Flower-Derived N/O/S Self-Doped Hierachically Porous Carbon for High-Performance Supercapacitors

Abstract

n this paper, multi-heteroatoms self-doped and hierarchically porous carbon materials have been designed and synthesized based on the pyrolysis of palm flower. The derived materials have been successfully co-doped with N, O, and S, demonstrating an ultra-high specific surface area (SSA) of 3362.51 m2g−1and an extra-large pore volume of 2.34 cm3×g−1 with interconnected macro-, meso- and micropores. The as-synthesized samples exhibit satisfactory electrochemical properties including high specific capacitance of 391.05 F g−1 (at 1 A g−1), good rate capability (85.70% capacitance retention at 10 A g−1) and superior cycling performance in alkaline electrolyte. The as-fabricated symmetric supercapacitor with the stable working voltage of 3.5 V shows a high energy density of 128.63Wh kg−1 and excellent cycle life of 94.93% after 10,000 cycles in ionic liquids electrolyte. This porous carbon materials derived from nature materials can be good candidate materials for fabricating energy storage devices.

Keywords: porous carbon materials, supercapacitors, multi-heteroatoms self-doped, hierarchically