Coating Activated Carbon from Coconut Shells with Co3O4/CeO2 for High-Performance Supercapacitor Applications: An Experimental Study

Krittiya Chopngam, Montri Luengchavanon, Matthana Khangkhamano, Kanadit Chetpattananondh, Warakorn Limbut

Abstract


Activated carbon from coconut shells is a low-cost, environmentally friendly material that is available for fabricating the electrodes for electric double-layer capacitance supercapacitors. As such, activated carbon derived from coconut shells was coated with Co3O4/CeO2, and its electrical and ionic conductivity were evaluated. The ternary technique for selecting materials was systematically investigated with an economical process. The Co3O4/CeO2 coating that was formed on the activated carbon coconut shells was deemed AC-Co3O4-CeO2. The 90-05-05 composite was the best electrode for electric double-layer capacitance supercapacitors, resulting in high conductivity (0.62 x 10^3 S·cm2), low series resistance and internal resistance (based on the Nyquist plot), and the charge-discharge was able to reach 0.56 V for 90 seconds (1A/g). Therefore, activated carbon coconut shells coated in Co3O4/CeO2 can promote the necessary characteristics of electrodes needed for electric double-layer capacitance supercapacitors.

Keywords


Coconut shell; Activated carbon; Specific surface area; Supercapacitor; Electrodes

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