Exploring dual synergistic effects of CeO2@ZnO mediated sarcophrynium brachystachys leaf extract nanoparticles for supercapacitor electrodes applications

Abstract

Cerium oxide (CeO2), Zinc oxide (ZnO) and Zinc@Cerium oxides composites (CeO2@ZnO) electrodes were synthesized using aqueous extract of Sarcophrynium Brachystachys leaf extract as comforting agent employing hydrothermal technique. The X-ray diffraction (XRD) studies revealed crystallites of various nanoparticles (NPs) sizes valued from the Debye-Scherer's equation to be 26.50, 26.77 and 26.50 nm for CeO2, ZnO and CeO2@ZnO respectively. The electrochemical analysis shown that the estimated specific capacitance acquired using cyclic voltammetry (CV) employing 10.0 mV/s scan rates are 976, 878 and 1075 F/g for CeO2, ZnO, and CeO2@ZnO respectively. Results obtained indicated clearly that specific capacitance of mixed metal oxides and Sarcophrynium Brachystachys leaf extract, an organic and natural material is better when compared with separate metal oxide alone. Sarcophrynium Brachystachys leaf extract increased the synergistic effect among constituent ions by reducing electrodes resistance, increasing electrodes conductivity and enriched electrode features.

Keywords

• Electrode
• Sarcophrynium Brachystachys
• Supercapacitors
• Specific capacitance
• Energy density
• Power density