Synthesis and characterization of porous carbon derived from activated banana peels with hierarchical porosity for improved electrochemical performance

摘要: Abstract Banana peels, a common fruit waste was adopted as material precursor in this study to synthesize highly porous activated carbon from banana peels (ABP) which serves an electrode for symmetric supercapacitor device. The activation done using KOH pellets at different carbonization temperatures ranging 750 °C 950 °C. ABP sample obtained the 900 °C temperature (ABP900) exhibited unique properties such hierarchical nano-architecture containing micropores, and mesopores with highest specific surface area (1362 m2 g−1). Electrochemical performance investigation neutral aqueous electrolytes showed that best response NaNO3 ABP900 electrode. device subsequently assembled 1 M operated potential window of 1.8 V, capacitance 165 F g−1 corresponding energy density 18.6 W h kg−1 0.5 A g−1. A 100% retention columbic efficiency were after 10000 continuous charge-discharge cycles 5 A g−1. Remarkably, subjecting voltage holding test 60 h, observed increase 328 F g−1 increased about 36.9 W h kg−1 0.5 A g−1, suggesting 98% its initial value holding. Thus, results reported showcase nanostructured useful design high-performance electrodes stable electrochemical capacitors.