Investigation of Different Aqueous Electrolytes for Biomass-Derived Activated Carbon-Based Supercapacitors

The present work reports the synthesis of biomass derived activated carbon and its electrochemical behaviour in different electrolytes. Ricinus communis shell (RCS) was used as a raw material this study for (AC) following high-temperature activation procedure using potassium hydroxide activating agent. physical structural characterization prepared shell-derived (RCS-AC) carried by Brunauer-Emmett-Teller analysis, X-ray diffraction Fourier Transform Infrared Spectroscopy, Raman Spectroscopy Scanning Electron Microscopy. synthesized AC electrochemically characterized various techniques such Cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) tests, Electrochemical impedance spectroscopy (EIS) measurements aqueous electrolytes (KOH, H2SO4, Na2SO4). results show that double layer properties RCS-AC are distinct. In specific, working electrode tested 3 M KOH showed excellent performance. It demonstrated specific capacitance 137 F g−1 (at 1 A KOH) exhibited high energy power densities 18.2 W hkg−1 663.4 kg−1, respectively. observed remains stable with 97.2% even after 5000 continuous charge discharge cycles, indicating long-term stability. confirmed RCS-derived exhibits good stability physicochemical characteristics, making them commercially promising appropriate storage applications.