Heteroatom-doped porous carbon electrodes derived from a carbonyl-based aromatic porous polymer for supercapacitors

Two different heteroatom-doped microporous carbon materials, c-CBAP-N (nitrogen-doped) and c-CBAP-NS (nitrogen/sulfur co-doped), were prepared using a carbonyl-based aromatic porous polymer (CBAP) after amine-functionalization or chemical impregnation, followed by carbonization at 800 degrees C. The surface areas of c-CBAP-N and c-CBAP-NS were 1060 m(2) g(-1) and 1047 m(2) g(-1), respectively, which are predominantly microporous with a uniform pore size distribution centered at 0.4 nm. Their electrochemical performances as supercapacitors were measured by a three-electrode system using a 6 M KOH solution as the electrolyte. The specific capacitances of the c-CBAP-N and c-CBAP-NS electrodes were 203.2 F g(-1) and 157.7 F g(-1), respectively, as measured by galvanostatic discharge-charge analysis at a current density of 1 A g(-1). Notably, these values are significantly higher than that of commercial activated carbon (130 F g(-1) at 1 A g(-1)).