°C for 6 h in nitrogen atmosphere and HF etching for . The as-obtained NOMC with nitrogen level of 6.45 at. % delivered the capacitance of 427 F g -1 at 1 A g -1 in 6 M KOH solution and superior to OMC (139 F g -1 ) as exhibited in Fig. . This was also validated by the fact that both SBET and pore volume of NOMC (1919 m 2 g -1 ; 2.18 cm 3 g -1 ) are higher than OMC (1421 m 2 g -1 ;1.48 cm 3 g -1 ). Hence it has been suggested that doping of heteroatom made a significant contribution towards both textual properties as well as electrochemical properties. depicts the CV profile of Cl-doped OMC and OMC that revealed the presence of couple of anodic peaks at 0.24 V and 0.44 V in the former one is attributed to Cl doping. The supercapacitor studies revealed that the Cl-doped OMC submitted the capacitance of 250 F g - 1 at 0.5 A g -1 in 1 M H2SO4 which is superior to OMC without Cl (179 F g -1 ) and displayed in The NOMC derived from the weight proportion of two dopants is 0.1 produced the enhanced gravimetric capacitance of 310 F g -1 at 1 A g -1 in 6 M KOH solution and found to be superior to OMC (78 F g -1 ), NOMC-py (170 F g -1 ) and NOMC-carbamide (150 F g -1 ). Also, the NOMC derived from both the dopants shown the excellent durability with 95.5% of capacitance retained after 5000 cycles at 20 A g -1 . Moreover, the NOMC based symmetric supercapacitor delivered the enriched energy density of 17.8 Wh Kg -1 1 M Na2SO4 at the operating voltage of 1.8 V along with 96.2% of retention of capacitance after 5000 cycles at 5 A g -1 . The amplified capacitance was due to the increased content of pyridinic N as well as the large pore size of