Article Dans Une Revue RSC Advances Année : 2025

Facile preparation of cobalt-oxide nanostructures with enriched cobalt( ii ) ion surface using Solanum melongena for energy application

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The increasing demand for efficient energy conversion and storage systems necessitates the development of high-performance, cost-effective electrode materials. To address this challenge, we employed rotten Solanum melongena (eggplant) juice as a precursor for the fabrication of low-cost, earth-abundant, and active electrode materials based on cobalt oxide (Co3O4) nanostructures. Different volumes of rotten Solanum melongena juice (5 mL, 10 mL, 15 mL, and 20 mL) were utilized during the precipitation process to synthesize Co3O4 nanostructures. These nanostructures were characterized in terms of crystal quality, surface morphology, surface chemical composition, and electrochemical properties. Notably, the synthesis using 15 mL of rotten Solanum melongena juice resulted in a highly efficient electrode material for oxygen evolution reaction (OER) in 1 M KOH electrolytic solution, with an overpotential of 276 mV at 10 mA cm⁻². In addition to its electrocatalytic properties, the Co3O4 electrode material was evaluated for supercapacitor applications, demonstrating a specific capacitance of 1303.13 F/g, an energy density of 28.96 Wh/kg at 1.25 A/g, and a 97% specific capacitance retention over 30,000 galvanic charge-discharge cycles.

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hal-05241630 , version 1 (08-12-2025)

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Abdul Jaleel Laghari, Umair Aftab, Muhammad Ishaque Abro, Aneela Tahira, Elmuez Dawi, et al.. Facile preparation of cobalt-oxide nanostructures with enriched cobalt( ii ) ion surface using Solanum melongena for energy application. RSC Advances, In press, 15 (38), pp.31107-31121. ⟨10.1039/D5RA02960K⟩. ⟨hal-05241630⟩
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