°C for three hours along with flow of nitrogen gas followed by washing with 1 M Hydrochloric acid solution . The prepared material (LCA-750) delivered the gravimetric capacitance of 223 F g -1 at 1 A g -1 in 6 M KOH solution which is appreciably greater than LC without activation with KOH (95 F g -1 at 1 A g -1 ) along with excellent stability such that 97% of the retention of capacitance was observed after 50000 cycles at 10 A g -1 . The amplified electrochemical performance was attributed to high SBET of 798 m 2 g -1 along with higher content of oxygen (18 at. %) analysed from XPS. Moreover, the augmented energy density of 66.8 Wh Kg -1 was observed in EMIMTFSi at the cell voltage of 3.2 V. Yan zhou et al.