A Novel Porous N- and S-Self-Doped Carbon Derived from Chinese Rice Wine Lees as High-Performance Electrode Materials in a Supercapacitor

Using Chinese rice wine lees as a highly accessible and green carbon source, a new synthetic strategy has been developed for the facile and green fabrication of a N and S co-doped porous carbon (NSHPC) material via a facile carbonization and activation process. The obtained NSHPC samples possess a hierarchical porous structure with a large specific surface area and perform quite well in a super capacitor. The prepared NSHPC electrode achieves a quite high capacitance of 433.5 F g(-1) at 1 A g(-1) in a 6 M KOH electrolyte, excellent rate capability, and good cycle stability. In particular, the prepared electrode can still achieve a high specific capacitance of 307.8 F g(-1) when 50 mg of electroactive materials is loaded. The assembled NSHPS-based symmetric capacitor exhibits a high energy density of 17.8 Wh kg(-1) at a power density of 450 W kg(-1). This study provides an efficient and green strategy for preparing a high-performance N and S co-doped porous carbon material for energy storage applications.