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<p>The incorporation of reduced graphene oxide (rGO) markedly enhances the electrical conductivity, mechanical robustness, and interfacial charge transport characteristics of transition metal sulfides. Owing to their synergistic nanoscale interactions, rGO-integrated metal sulfide composites have emerged as versatile materials for high-performance energy storage and conversion devices. In the present study, a porous reduced graphene oxide/manganese cobalt sulphide (rGO@MnCo₂S₄) hybrid electrode was successfully synthesized through a facile hydrothermal approach. This design strategy aims to improve both the charge storage capacity and long-term cycling stability for supercapacitor applications. Electrochemical evaluation demonstrates that the pristine MCS and rGO@MCS electrodes exhibit specific capacitances of 277&#xa0;F g⁻¹ and 472&#xa0;F g⁻¹, respectively, at a current density of 1&#xa0;A g⁻¹. Moreover, the MCS electrode retains 89% of its initial capacitance after 10,000 cycles, while the rGO@MCS electrode maintains a remarkable 97% retention under identical testing conditions. An asymmetric supercapacitor device assembled using MnCo₂S₄ as the positive electrode and rGO as the negative electrode delivers a maximum energy density of 60 Wh kg⁻¹ at a power density of 850&#xa0;W kg⁻¹. These findings affirm the superior electrochemical performance and structural stability of the rGO@MCS hybrid, underscoring its strong potential for next-generation high-energy-density supercapacitor applications.</p>

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Facile hydrothermal synthesis of rGO@MnCo₂S₄ hybrid electrodes for high-performance asymmetric supercapacitors

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Srigitha. S. Nath,
  • Samuthira Pandi V.,
  • M. Saraswathi,
  • K. Sampath,
  • Pankaj Rangaree,
  • S. Kumaran

摘要

The incorporation of reduced graphene oxide (rGO) markedly enhances the electrical conductivity, mechanical robustness, and interfacial charge transport characteristics of transition metal sulfides. Owing to their synergistic nanoscale interactions, rGO-integrated metal sulfide composites have emerged as versatile materials for high-performance energy storage and conversion devices. In the present study, a porous reduced graphene oxide/manganese cobalt sulphide (rGO@MnCo₂S₄) hybrid electrode was successfully synthesized through a facile hydrothermal approach. This design strategy aims to improve both the charge storage capacity and long-term cycling stability for supercapacitor applications. Electrochemical evaluation demonstrates that the pristine MCS and rGO@MCS electrodes exhibit specific capacitances of 277 F g⁻¹ and 472 F g⁻¹, respectively, at a current density of 1 A g⁻¹. Moreover, the MCS electrode retains 89% of its initial capacitance after 10,000 cycles, while the rGO@MCS electrode maintains a remarkable 97% retention under identical testing conditions. An asymmetric supercapacitor device assembled using MnCo₂S₄ as the positive electrode and rGO as the negative electrode delivers a maximum energy density of 60 Wh kg⁻¹ at a power density of 850 W kg⁻¹. These findings affirm the superior electrochemical performance and structural stability of the rGO@MCS hybrid, underscoring its strong potential for next-generation high-energy-density supercapacitor applications.