The present work includes fabrication of a binary and ternary and composites of reduced graphene oxide (RGO),
Polyaniline (Pani), and cobalt Prussian blue analog (Co-PA) for high performance supercapacitor. The materials
were characterized using XRD, SEM, FT-IR, and BET techniques. The results confrm the formation of the desired
nanocomposites. The electrochemical properties were evaluated in three electrode confguration using CV, CCD
and EIS methods. The ternary composite of RGO@Pani@Co-PA showed better electrochemical properties than
that obtained from the binary composites as well as their constituent components. The ternary-based sample had
a specifc capacitance of 490 Fg-1 at a current density of 1 A g-1 and a minimal capacitance loss of 93.9% after
3000 electric cycles. The ternary composites’ remarkable electrochemical performance has been attributed to
their well-thought-out, distinctive architecture, which offers a substantial surface area and promotes synergistic
effects among the other ingredients. The ternary RGO@Pani@Co-PA composite was used as the anode electrode
(positive) and activated carbon as the cathode (negative) materials in the assembly of the asymmetric supercapacitor (ASC) device. Over a wide potential window of 2 V, the fabricated ASC had a remarkable specifc
energy of 58.9 Wh kg-1 at a specifc power of 9210 W kg-1 and 88.5% device capacitance stability after 5000
cycles of charge/discharge.