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<p>A novel CuMn₂O₄/MnO₂/MWCNT composite was fabricated through a facile hydrothermal approach, aiming to overcome the conductivity and stability limitations of conventional metal oxide-based electrodes. Structural and surface analyses confirmed the successful integration of spinel CuMn₂O₄ and MnO₂ with carbon nanotubes, resulting in a porous, interconnected network ideal for charge storage. Electrochemical tests using CV, GCD, and EIS revealed that the incorporation of MWCNTs significantly enhanced electron mobility and ion diffusion, leading to superior capacitive behavior. The optimized electrode exhibited an imposing specific capacitance of 918&#xa0;F g⁻¹ at 1&#xa0;A g⁻¹ and maintained 92.7% of its capacity over 5000 cycles. Additionally, when assembled into an asymmetric device with activated carbon, the hybrid delivered a wide voltage window of 1.6&#xa0;V and an energy density of 53.5 Wh kg⁻¹ at 759&#xa0;W kg⁻¹, along with excellent long-term cycling retention of 97.5%. These findings validate the synergistic effect of combining mixed metal oxides with conductive carbon frameworks and demonstrate the composite’s strong potential for next-generation energy storage systems.</p>

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Synergistic CuMn2O4/MnO2/MWCNT nanohybrid for ultra-stable and high-energy asymmetric supercapacitors

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • T. Syeda Jeelani Basri,
  • B. Anandan,
  • P. Karpagam,
  • Cmak Zeelan basha,
  • V. Gowrishankar,
  • N. Kumaran

摘要

A novel CuMn₂O₄/MnO₂/MWCNT composite was fabricated through a facile hydrothermal approach, aiming to overcome the conductivity and stability limitations of conventional metal oxide-based electrodes. Structural and surface analyses confirmed the successful integration of spinel CuMn₂O₄ and MnO₂ with carbon nanotubes, resulting in a porous, interconnected network ideal for charge storage. Electrochemical tests using CV, GCD, and EIS revealed that the incorporation of MWCNTs significantly enhanced electron mobility and ion diffusion, leading to superior capacitive behavior. The optimized electrode exhibited an imposing specific capacitance of 918 F g⁻¹ at 1 A g⁻¹ and maintained 92.7% of its capacity over 5000 cycles. Additionally, when assembled into an asymmetric device with activated carbon, the hybrid delivered a wide voltage window of 1.6 V and an energy density of 53.5 Wh kg⁻¹ at 759 W kg⁻¹, along with excellent long-term cycling retention of 97.5%. These findings validate the synergistic effect of combining mixed metal oxides with conductive carbon frameworks and demonstrate the composite’s strong potential for next-generation energy storage systems.