article · Hybrid Advances
Electrodes composed of cerium oxide, zinc oxide, and a cerium-zinc oxide composite were synthesised via a hydrothermal method incorporating an aqueous extract of Sarcophrynium brachystachys leaves. Structural analysis confirmed crystalline nanoparticle sizes ranging between 26.50 and 26.77 nanometres across the materials. Electrochemical testing at a scan rate of 10.0 millivolts per second demonstrated specific capacitance values of 976 farads per gram for cerium oxide, 878 farads per gram for zinc oxide, and 1075 farads per gram for the composite. The composite material prepared with the plant extract outperformed the individual metal oxides. Utilising the organic leaf extract enhanced the synergistic interactions between the constituent ions, which reduced internal electrode resistance, improved electrical conductivity, and enriched overall electrode characteristics for energy storage applications.
Improving energy storage devices relies on developing electrode materials with higher conductivity and capacitance. Using plant extracts as natural agents to prepare mixed metal oxide composites provides an alternative synthesis approach. This demonstrates how combining common metal oxides with biological extracts can yield higher specific capacitance and lower resistance, which are crucial attributes for high-performance supercapacitor systems.
This work is targeted at supercapacitor electrode development and could interest energy storage device manufacturers exploring alternative green synthesis methods. The findings are at an early laboratory stage, demonstrating basic material synthesis and electrochemical performance metrics without prototyping complete devices or establishing industrial scalability.
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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.
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DOI: 10.1016/j.hybadv.2024.100143
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