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<p>Nickel manganese sulfide (NiMnS) and cobalt hydroxide (Co(OH)₂)-based hybrid materials are suitable options for supercapacitor electrodes with high performance because of their distinguished physicochemical characteristics, which provide enhanced accessibility of the electrolyte and interaction of ions on the electrode surface. In this work, a low-cost <i>insitu</i> hydrothermal process for the synthesis of a NiMnS/Co(OH)₂/GO hybrid (NMS-COH-G2) composite is reported. The addition of graphene oxide to the hybrid composite enhances electron transportation as well as ion diffusion processes. Galvanostatic discharge–charge analyses demonstrate an exceptionally high specific capacitance (C<sub>s</sub>) of 1130&#xa0;F g⁻¹ at a current density of 4.0&#xa0;A g⁻¹ for the composite, far superior to the pure compounds NiMnS (428&#xa0;F g⁻¹) and Co(OH)₂ (337&#xa0;F g⁻¹) at the same conditions. The composite also provides a significant energy density of 17.2 Wh/kg and power density of 663&#xa0;W/kg, which is roughly 2.64 times greater than NiMnS (6.55 Wh/kg) and 3.37 times greater than Co(OH)₂ (5.15 Wh/kg). Furthermore, the electrode has superior cycling stability, maintaining around 94.5% of its original capacitance after 1000 charge–discharge cycles. The improved supercapacitive property of the NiMnS/Co(OH)₂/GO composite is ascribed to the synergistic effect between the hybrid structure and the complementary nature of the individual components, which in combination induce superior surface-dependent electrochemical activity.</p>

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Novel NiMnS/Co(OH)₂/Graphene oxide hybrid composite for high-performance supercapacitor electrodes

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Madiha Mumtaz,
  • Umber Kalsoom,
  • Ahsan Waleed,
  • Sajida Nawaz,
  • Nayab Raza,
  • Harsha Vardhan Potturu

摘要

Nickel manganese sulfide (NiMnS) and cobalt hydroxide (Co(OH)₂)-based hybrid materials are suitable options for supercapacitor electrodes with high performance because of their distinguished physicochemical characteristics, which provide enhanced accessibility of the electrolyte and interaction of ions on the electrode surface. In this work, a low-cost insitu hydrothermal process for the synthesis of a NiMnS/Co(OH)₂/GO hybrid (NMS-COH-G2) composite is reported. The addition of graphene oxide to the hybrid composite enhances electron transportation as well as ion diffusion processes. Galvanostatic discharge–charge analyses demonstrate an exceptionally high specific capacitance (Cs) of 1130 F g⁻¹ at a current density of 4.0 A g⁻¹ for the composite, far superior to the pure compounds NiMnS (428 F g⁻¹) and Co(OH)₂ (337 F g⁻¹) at the same conditions. The composite also provides a significant energy density of 17.2 Wh/kg and power density of 663 W/kg, which is roughly 2.64 times greater than NiMnS (6.55 Wh/kg) and 3.37 times greater than Co(OH)₂ (5.15 Wh/kg). Furthermore, the electrode has superior cycling stability, maintaining around 94.5% of its original capacitance after 1000 charge–discharge cycles. The improved supercapacitive property of the NiMnS/Co(OH)₂/GO composite is ascribed to the synergistic effect between the hybrid structure and the complementary nature of the individual components, which in combination induce superior surface-dependent electrochemical activity.