| 초록 |
Among various energy storage systems, supercapacitors have shown long cycle-lifetime, high power density, fast charge-discharge rate. Carbonaceous materials, carbon nanotubes, graphene, carbon aerogels and porous carbons (PCs) are mainly used as electrode materials for supercapacitors. PCs have attracted much attention because of their large specific surface areas, tunable pore sizes, superior stability, easy processability, and low cost. The recent development of biomass-derived PCs is of growing interest because it is sustainable, inexpensive and environmentally friendly. Lignin is the second most abundant organic polymer in nature. Herein, we introduce the preparation of lignin-derived PCs using a simple, energy-saving and environmentally friend hydrothermal carbonization (HTC) in the presence of H2SO4 catalysts and then activation with KOH and urea to improve specific surface area and electrochemical performance of hierarchically porous N-doped carbons. |
