Abstract
Spinel Co3O4 quantum dots (QDs) were synthesized for supercapacitor application using a customized plasma discharge reactor that generates stable non-equilibrium, high-density microplasma at ambient conditions. Microplasma, generated above the cobalt nitrate hexahydrate [Co(NO3)2·6H2O] solution using argon gas at 35 W discharge power, induced particle nucleation via high-energy electron collisions. High-resolution transmission electron microscopy (HR-TEM) images demonstrated that Co3O4 particles had an ellipsoidal morphology with an average size of 4 nm. Electrochemical investigation exhibited pseudocapacitive behavior, yielding a significant specific capacitance of 348.5 Fg−1 at 1 Ag−1 current density with a notable retention capacity in 1 M KOH electrolyte. These findings confirm Co3O4 QDs suitability as electrode material for supercapacitor applications.
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