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<p>We report the synthesis and electrochemical performance of a novel binary composite comprising rod-shaped α-phase Manganese dioxide (MnO₂) and pea-derived carbon (PDC) (MnO₂/PDC) for high-performance supercapacitors. The composite was prepared by mechanical milling and characterized using XRD, FTIR, Raman spectroscopy, TEM, SEM, and XPS. The electrochemical evaluation in three- and two-electrode configurations with aqueous Na₂SO₄ electrolyte revealed good charge-storage capability, excellent rate performance, and superior cyclic stability. The synergistic combination of MnO₂ nanostructures with sustainable biomass-derived carbon significantly enhances electrochemical performance, offering a promising and environmentally friendly approach to next-generation energy-storage materials. The MnO<sub>2</sub>/PDC composite exhibited a specific capacitance of 303.4&#xa0;F g<sup>− 1</sup> at a current density of 4&#xa0;mA cm<sup>− 2</sup>. Additionally, the MnO<sub>2</sub>/PDC composite demonstrated an excellent electrode material-electrolyte interface compatibility with capacitance retention rate of 90% after 5000 charge-discharge cycles. The composite attained a specific energy of 71.2 Wh kg<sup>− 1</sup> and a specific power of 1363&#xa0;W kg<sup>− 1</sup>. Moreover, the composite was tested in a two-electrode assembly device and it exhibited the specific capacitance of 107.7&#xa0;F g<sup>− 1</sup> at 4&#xa0;mA cm<sup>− 2</sup> current density.</p>

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Sustainable Carbon Meets Transition Metal Oxide: Fabrication and Electrochemical Assessment of α-MnO₂/Biomass-Carbon Supercapacitor Electrodes

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Sandip M. Mahadev,
  • Rahul S. Redekar,
  • Ganesh S. Powar,
  • Nilesh L. Tarwal,
  • Sushilkumar A. Jadhav

摘要

We report the synthesis and electrochemical performance of a novel binary composite comprising rod-shaped α-phase Manganese dioxide (MnO₂) and pea-derived carbon (PDC) (MnO₂/PDC) for high-performance supercapacitors. The composite was prepared by mechanical milling and characterized using XRD, FTIR, Raman spectroscopy, TEM, SEM, and XPS. The electrochemical evaluation in three- and two-electrode configurations with aqueous Na₂SO₄ electrolyte revealed good charge-storage capability, excellent rate performance, and superior cyclic stability. The synergistic combination of MnO₂ nanostructures with sustainable biomass-derived carbon significantly enhances electrochemical performance, offering a promising and environmentally friendly approach to next-generation energy-storage materials. The MnO2/PDC composite exhibited a specific capacitance of 303.4 F g− 1 at a current density of 4 mA cm− 2. Additionally, the MnO2/PDC composite demonstrated an excellent electrode material-electrolyte interface compatibility with capacitance retention rate of 90% after 5000 charge-discharge cycles. The composite attained a specific energy of 71.2 Wh kg− 1 and a specific power of 1363 W kg− 1. Moreover, the composite was tested in a two-electrode assembly device and it exhibited the specific capacitance of 107.7 F g− 1 at 4 mA cm− 2 current density.