Promising nitrogen-doped porous nanosheets carbon derived from pomegranate husk as advanced electrode materials for supercapacitors

作者：Sun, Kanjun^*; Li, Jindan; Peng, Hui; Feng, Enke; Ma, Guofu^*; Lei, Ziqiang

来源：Ionics, 2017, 23(4): 985-996.

DOI：10.1007/s11581-016-1897-5

• Supercapacitor
• Pomegranate husk
• N-doped
• Activated carbon

Nitrogen-doped porous activated carbons (N-PHACs) have been successfully synthesized using pomegranate husk as carbon precursor via ZnCl2-activation carbonization and subsequent urea-assisted hydrothermal nitrogen-doping method. The obtained N-PHACs possesses abundant mesoporous structure, high specific surface area (up to 1754.8 m(2) g(-1)), pore volume (1.05 cm(3) g(-1)), and nitrogen-doping content (4.51 wt%). Besides, the N-PHACs-based material showed a high specific capacitance of 254 F g(-1) at a current density of 0.5 A g(-1) and excellent rate performance (73% capacitance retention ratio even at 20 A g(-1)) in 2 M KOH aqueous electrolyte, which is attributed to the contribution of double-layer capacitance and pseudocapacitance. The assembled N-PHACs-based symmetric capacitor with a wide operating voltage range of 0-1.8 V exhibits a maximum energy density of 15.3 Wh kg(-1) at a power density of 225 W kg(-1) and superior cycle stability (only 6% loss after 5000 cycles) in 0.5 M Na2SO4 aqueous electrolyte. These exciting results suggest that the novel N-doping porous carbon material prepared by a green and low-cost design strategy has a potential application as high-performance electrode materials for supercapacitors.

• 出版日期2017-4
• 单位西北师范大学; 兰州城市学院