Argan Pulp specific energy power densities successful conversion novel Argan Pulp activated two-step process supercapacitor carbonization followed activation temperatures and ratios biomass AP-800-4 exhibited the highest specific surface area > 3200 m2.g-1 a total volume of 1.63 cm3.g-1. Electrochemical Double-Layer Capacitor (EDLC). The sample AP-800-3 exhibits high capacitance 460 F.g-1 at current density 0.125 A.g-1 using 1M H2SO4 as electrolyte. High 16.5 Wh kg?1 ~170 W excellent cycling stability 2500 charge discharge cycles Na2SO4 KOH retention