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<p>Scientists and researchers are constantly striving to enhance the energy storage capacity, power density, and cycle life of supercapacitors. In this study, we comparatively analyse the electrochemical performance of molybdenum trioxide forming composites with graphite or tungsten trioxide or manganese dioxide for supercapacitor material application. The elementary behaviour is analysed using different characterization techniques like X-ray diffraction, FTIR, and SEM. The composites of MoO<sub>3</sub> with graphite and WO<sub>3</sub> demonstrate weaker performance while that with δ-MnO<sub>2</sub> shows excellent performance with a specific capacitance of 208 F/g at 10&#xa0;mV/s. This enhancement is attributed to the synergistic effect between MoO<sub>3</sub> and δ-MnO2, stemming from the layered structure and faradaic redox activity of MnO2, which facilitates improved charge storage via pseudocapacitance. Moreover, δ-MnO<sub>2</sub> accounts for superior reversibility of the redox reactions compared to other samples, and the reduced Rct and ESR values suggest improved conductivity and lower internal resistance, which support fast electron and ion. The weaker performance of graphite and WO<sub>3</sub> is attributed to its irreversibility and the hindrance to the electrolytic ions. These findings underscore the potential of MoO<sub>3</sub>/δ-MnO2 as a promising electrode material for advanced energy storage devices.</p>

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Synthesis and electrochemical characterization of MoO3-based composites with graphite, WO3, and δ-MnO2 for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Anju J. P.,
  • Ardra A. N.,
  • An Maria Thomas,
  • Abin Philip,
  • A. Ruban Kumar

摘要

Scientists and researchers are constantly striving to enhance the energy storage capacity, power density, and cycle life of supercapacitors. In this study, we comparatively analyse the electrochemical performance of molybdenum trioxide forming composites with graphite or tungsten trioxide or manganese dioxide for supercapacitor material application. The elementary behaviour is analysed using different characterization techniques like X-ray diffraction, FTIR, and SEM. The composites of MoO3 with graphite and WO3 demonstrate weaker performance while that with δ-MnO2 shows excellent performance with a specific capacitance of 208 F/g at 10 mV/s. This enhancement is attributed to the synergistic effect between MoO3 and δ-MnO2, stemming from the layered structure and faradaic redox activity of MnO2, which facilitates improved charge storage via pseudocapacitance. Moreover, δ-MnO2 accounts for superior reversibility of the redox reactions compared to other samples, and the reduced Rct and ESR values suggest improved conductivity and lower internal resistance, which support fast electron and ion. The weaker performance of graphite and WO3 is attributed to its irreversibility and the hindrance to the electrolytic ions. These findings underscore the potential of MoO3/δ-MnO2 as a promising electrode material for advanced energy storage devices.