Bio-Derived Porous Carbon/Nickel Oxide Composite for High-Performance Energy Storage Applications
Seitkazinova A.R. Nazhipkyzy M. Kudaibergenov K. Issanbekova A. Bergeneva N.S. Abdisattar A. Kyzgarina M.
October 2025Multidisciplinary Digital Publishing Institute (MDPI)
Journal of Composites Science
2025#9Issue 10
The development of bio-derived composites represents a sustainable and cost-effective strategy for advanced energy storage applications. In this work, a porous carbon/nickel oxide (NiO) composite was synthesized from orange peel via carbonization at 500 °C followed by KOH activation at 700 °C and subsequent hydrothermal NiO modification. The resulting material exhibited a hierarchical porous structure with a high specific surface area (2120 m2 g−1 for OP_500_700 and 1968 m2 g−1 for NiO-modified OP_500_700_0.1M), with both values being significantly higher than that of the non-activated OP_500 (3.40–18.12 m2 g−1). Electrochemical evaluation revealed that the NiO-functionalized composite achieved a specific capacitance of 306.0 F g−1 at 5 mV s−1 and 281.5 F g−1 at 2 A g−1, surpassing the pristine activated carbon (281.9 F g−1 and 259.6 F g−1, respectively). In addition, both electrodes demonstrated excellent cycling stability, retaining more than 80% capacitance after 5000 charge–discharge cycles at a high current density of 20 A g−1, while the NiO-modified electrode further benefited from a self-activation effect leading to >100% retention. These findings emphasize the synergistic effects of hierarchical porosity and NiO pseudocapacitance, establishing orange peel-derived carbon/NiO composites as scalable and sustainable electrode materials for next-generation supercapacitors.
chemical activation , electrode material , hydrothermal treatment , NiO-modified , porous carbon , supercapacitor , sustainable energy storage
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Department of Chemical Physics and Material Science, Al-Farabi Kazakh National University, 71 Al-Farabi Ave., Almaty, 050038, Kazakhstan
Institute of Combustion Problems, Bogenbai Batyr Street 172, Almaty, 050012, Kazakhstan
Department of Materials Science, Nanotechnology and Engineering Physics, Satbayev University, Satpaev St. 22, Almaty, 050000, Kazakhstan
UNESCO Chair in Sustainable Development, Al-Farabi Kazakh National University, 71 Al-Farabi Ave., Almaty, 050038, Kazakhstan
Department of Chemical Physics and Material Science
Institute of Combustion Problems
Department of Materials Science
UNESCO Chair in Sustainable Development
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