Graphene oxide (GO) based electrodes often exhibit poor electrochemical performance due to agglomeration. Here, GO was functionalized with the expired heteroatom-rich pharmaceutical compound of Zolmitriptan (ZOLFGO) as a redox-active spacer to alleviate the mentioned issue. Next, to enhance the electrochemical performance, KOH-activated biochar derived from Heracleum Persicum seeds (HP) through pyrolysis (as a reaction medium) and 1-butyl-3-methylimidazolium tetrachloroferrrate ([Bmim][FeCl4]) ionic liquid (IL) (as a conductivity enhancer) were synthesized and physically composited with the ZOL-FGO. Evaluation of the electrochemical behavior of ZOL-FGO/HP/IL electrode in a three-electrode (3E) system revealed the hybrid supercapacitor nature and recorded a specific capacitance (Cs) of 522 F g-1 at 1 A g-1 and a Cs retention of 97.3 % over 10,000 cycles at 8 A g-1. Moreover, the ZOL-FGO/HP/IL//ZOL-FGO/HP/IL electrode was designed and analyzed in the two-electrode (2E) system to determine its practicability. This electrode recorded a Cs of 245 F g-1 at 1 A g-1, a Cs retention of 95.3 % over 10,000 cycles at 8 A g-1, and a power density of 900 W kg -1 at the energy density of 41.35 Wh kg -1. The results confirmed that the synergistic effect of the synthesized materials could be promising in constructing a high-performance hybrid supercapacitor.
