Phiri et al. developed the porous activated carbon from willow wood by allowing the carbonized form to activation with caustic potash where the mass proportion of KOH and C are 0,1,3,6 and 9 at 800 °C for 60 minutes and followed by washing with 1 M HCl . Out of various combinations, the sample WW-KOH 9 delivered the boo1sted specific capacitance of 394 F g -1 at 1 Ag -1 in 6 M KOH aqueous solution with increased stability revealing the 94% of capacitance retained after 5000 cycles. Also, it delivered the increased energy density of 23