Facile preparation of nitrogen, oxygen and sulfur co-doped porous carbon for zinc-ion hybrid capacitor

Heteroatoms doped porous carbon materials exhibit enormous potentiality in the field of energy storage field. Herein, we developed a facile strategy for preparing oxygen/nitrogen/sulfur co-doped porous carbon using acesulfame potassium as sulfur, nitrogen source and activator, polyacrylamide as carbon and nitrogen source. Benefiting from the suitable specific surface area and a certain amount of nitrogen (4.52 at%), oxygen (5.49 at%) and sulfur (0.28 at%) functional groups, the obtained ONSPC-700 samples exhibit a specific capacitance of 282.0 F g⁻¹ and superior electrochemical stability with a high capacitance retention of 97.3% after 10,000 cyclic testing. Furthermore, the constructed ONSPC-700//ONSPC-700 symmetrical supercapacitor displays an energy density of 14.5 Wh kg⁻¹ and superior electrochemical stability with a high capacitance retention of 95.8% after 10,000 cyclic testing. More importantly, the assembled Zn//ZnSO₄//ONSPC-700 hybrid capacitor achieves an energy density of 86.2 Wh kg⁻¹ and a high capacitance retention of 95.1% after 6000 cyclic testing. The research provides a novel and facile way for preparing heteroatoms doped porous carbon for energy storage device.