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CaO impregnated highly porous honeycomb activated carbon from agriculture waste: symmetrical supercapacitor study
- Ali, Gomaa A. M., Habeeb, Omar Abed, Algarni, H., Chong, Kwok Feng
- Journal of materials science 2019 v.54 no.1 pp. 683-692
- activated carbon, agricultural wastes, calcium oxide, capacitance, chickens, egg shell, electrochemistry, electrodes, nanoparticles
- This study presents the electrochemical studies of activated carbon prepared from palm kernel shell (ACPKS), with CaO impregnation. The CaO is obtained from chicken eggshell waste to produce CaO/ACPKS, which shows highly porous honeycomb structure with homogeneous distribution of CaO nanoparticles (30–50 nm in size). The prepared materials are evaluated as supercapacitor electrodes by testing their electrochemical characteristics. A high specific capacitance value of 222 F g⁻¹ at 0.025 A g⁻¹ is obtained for CaO/ACPKS, which is around three times higher than that for ACPKS (76 F g⁻¹). In addition, electrochemical impedance data show lower impedance for CaO/ACPKS. Lastly, a practical symmetrical supercapacitor is fabricated by CaO/ACPKS and its performance is discussed.