For the first time, Zhang et al. used the lignin-derived byproducts as carbon precursor to develop an interconnected hierarchical porous nitrogen-doped carbon (HPNC) via hydrothermal treatment, and KOH activation at 800 ˚C under Ar atmosphere . The yield of the carbon material was found to be 28.3 wt%. The HPNC material showed hierarchical bowl-like pore structure with a SBET of 2218 m 2 g -1 , electronic conductivity of 4.8 S cm -1 , and the content of nitrogen, and oxygen heteroatoms was 3.4 at%, and 5.2 at%, respectively. The electrochemical experiments were carried out in a two-electrode symmetric cell using 6 M KOH electrolyte. The HPNC symmetric cell delivered a specific capacitance of 312 A g -1 at 1 A g -1 , and delivered the capacitance retention of 81% at 80 A g -1 , along with a cyclic life of 98% initial capacitance after 200000 cycles at 10 A g -1 . Further, in ionic liquid electrolyte of EMI-BF4, the HPNC-based supercapacitor displayed an energy density of 44.7 Wh Kg -1 at a power density of 73.1 kW Kg -1 as evident from The XPS analysis revealed the decreasing content of nitrogen heteroatom with increasing temperature from 600 to 800 ˚C during KOH activation. The amount pyrrolic/pyridonic N (N-5) species was significantly high in all the samples with the content in the range of 47.2 -71.4%. The electrochemical experiments were carried out in 6 M KOH electrolyte, and C/KH-700 electrode showed the highest specific capacitance of 348 F g -1 at 50 mA g -1 current density with a specific energy of 8.3 Wh Kg -1 , corresponding to the specific power of 1105 W Kg -1 .