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<p>Supercapacitors require high-performance electrode materials with efficient ion/electron transport pathways and tailored microstructures to achieve enhanced energy-storage performance. In this study, NiO/MgO and NiO/MgO/carbon nanocomposites were synthesized via a solution combustion technique. Structural and morphological investigations confirmed the successful formation of crystalline oxide phases and their effective integration with conductive carbon matrices. Electrochemical studies revealed that incorporating carbon materials significantly improved charge storage capacity compared with pristine NiO/MgO. Among the investigated composites, the NiO/MgO/graphene nanocomposite exhibited the highest specific capacitance of 1293&#xa0;F g⁻<sup>1</sup>, demonstrating superior electrochemical activity due to the synergistic interaction between the electroactive metal oxides and the conductive graphene network. Furthermore, a symmetric NiO/MgO/graphene coin-cell supercapacitor delivered a specific capacitance of 166&#xa0;F g⁻<sup>1</sup>, an energy density of 23.05&#xa0;Wh kg⁻<sup>1</sup>, and a power density of 1037&#xa0;W kg⁻<sup>1</sup>, along with excellent cycling stability of 97% capacitance retention after 2000 charge–discharge cycles. These findings highlight the potential of the NiO/MgO/graphene nanocomposite as a promising electrode material for advanced energy-storage applications.</p>

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Synergistic interface engineering of NiO/MgO and NiO/MgO/carbon nanocomposites for enhanced supercapacitor performance

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Shireesha Konda,
  • Shilpa Chakra Chidurala

摘要

Supercapacitors require high-performance electrode materials with efficient ion/electron transport pathways and tailored microstructures to achieve enhanced energy-storage performance. In this study, NiO/MgO and NiO/MgO/carbon nanocomposites were synthesized via a solution combustion technique. Structural and morphological investigations confirmed the successful formation of crystalline oxide phases and their effective integration with conductive carbon matrices. Electrochemical studies revealed that incorporating carbon materials significantly improved charge storage capacity compared with pristine NiO/MgO. Among the investigated composites, the NiO/MgO/graphene nanocomposite exhibited the highest specific capacitance of 1293 F g⁻1, demonstrating superior electrochemical activity due to the synergistic interaction between the electroactive metal oxides and the conductive graphene network. Furthermore, a symmetric NiO/MgO/graphene coin-cell supercapacitor delivered a specific capacitance of 166 F g⁻1, an energy density of 23.05 Wh kg⁻1, and a power density of 1037 W kg⁻1, along with excellent cycling stability of 97% capacitance retention after 2000 charge–discharge cycles. These findings highlight the potential of the NiO/MgO/graphene nanocomposite as a promising electrode material for advanced energy-storage applications.