Ionic-liquid-assisted synthesis of nitrogen-doped porous carbon for high-performance supercapacitors

This Nitrogen-doped porous carbon which is prepared by ionic-liquid-assisted method with just one-step process is successfully introduced N element and adequate mesopores. Under the suitable carbonization temperature (around 900 degrees C), this method creates high specific surface area (similar to 1542 m(2) g(-1)) and appropriate hierarchical pores (similar to 0.65 and similar to 4 nm) for target carbon. As an electrode in super-capacitors, this carbon material shows a 307 F g(-1) specific capacitance at 1 A g(-1) and an outstanding cycling performance of around 97.9% retainment after 5000 cycles. Even in an all-solid-state super-capacitor, it still performs well in the aspects of energy density and power density. Therefore, we believe this kind of porous carbon material would be a promising electrode material when applied in supercapacitors. (C) 2019 Published by Elsevier B.V.