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<p>In this work, α-Manganese Dioxide (α-MnO<sub>2</sub>) nanorods were synthesized by hydrothermal method and comprehensively assessed for electrochemical performance. Highly pure α-MnO<sub>2</sub> exhibited excellent specific capacitance (C<sub>sp</sub>) (157&#xa0;F g<sup>− 1</sup> at 5 mV s<sup>− 1</sup>), but its performance was degraded by structure delamination and low intrinsic electrical conductivity under repeated charge-discharge cycles. To avoid these limitations, hybrid nanocomposites of conductive polymers- polyaniline (PANI) and Polypyrrole (PPY)-were prepared, producing MnO<sub>2</sub>-PANI and MnO<sub>2</sub>-PPY composites. Detailed structural and morphological analyses by X-ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) facilitated fruitful composite synthesis. Fourier Transform infrared spectroscopy (FTIR) explain about the attached functional groups. Electrochemical characterization through cyclic voltammetry showed a remarkable rise in specific capacitance for MnO<sub>2</sub>-PANI and MnO<sub>2</sub>-PPY samples, reporting 233&#xa0;F g<sup>− 1</sup> and 282&#xa0;F g<sup>− 1</sup> respectively at a scan rate (S<sub>R</sub>) of 5 mV s<sup>− 1</sup>. In a striking point, MnO<sub>2</sub>-PPY composite reported better electrochemical properties with less solution resistance (Rₛ = 1.5 Ω) and smaller charge transfer resistance (R<sub>ct</sub> = 4.3 Ω) as measured through Electrochemical Impedance Spectroscopy (EIS). It exhibited an energy density (E<sub>d</sub>) of 31.5 Wh kg<sup>− 1</sup> with a power density (P<sub>d</sub>) of 2700&#xa0;W kg<sup>− 1</sup> at 3&#xa0;A g<sup>− 1</sup>. Cyclic stability tests for 5000 cycles with long-term revealed good capacitance retention of about 81.9%, confirming MnO<sub>2</sub>-PPY as the best high-performance hybrid supercapacitor material.</p>

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Engineering MnO2–conducting polymer nanocomposites toward highly stable supercapacitors

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Ritesh Kumar,
  • Shweta Tanwar,
  • A. L. Sharma,
  • Rajesh K. Singh

摘要

In this work, α-Manganese Dioxide (α-MnO2) nanorods were synthesized by hydrothermal method and comprehensively assessed for electrochemical performance. Highly pure α-MnO2 exhibited excellent specific capacitance (Csp) (157 F g− 1 at 5 mV s− 1), but its performance was degraded by structure delamination and low intrinsic electrical conductivity under repeated charge-discharge cycles. To avoid these limitations, hybrid nanocomposites of conductive polymers- polyaniline (PANI) and Polypyrrole (PPY)-were prepared, producing MnO2-PANI and MnO2-PPY composites. Detailed structural and morphological analyses by X-ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) facilitated fruitful composite synthesis. Fourier Transform infrared spectroscopy (FTIR) explain about the attached functional groups. Electrochemical characterization through cyclic voltammetry showed a remarkable rise in specific capacitance for MnO2-PANI and MnO2-PPY samples, reporting 233 F g− 1 and 282 F g− 1 respectively at a scan rate (SR) of 5 mV s− 1. In a striking point, MnO2-PPY composite reported better electrochemical properties with less solution resistance (Rₛ = 1.5 Ω) and smaller charge transfer resistance (Rct = 4.3 Ω) as measured through Electrochemical Impedance Spectroscopy (EIS). It exhibited an energy density (Ed) of 31.5 Wh kg− 1 with a power density (Pd) of 2700 W kg− 1 at 3 A g− 1. Cyclic stability tests for 5000 cycles with long-term revealed good capacitance retention of about 81.9%, confirming MnO2-PPY as the best high-performance hybrid supercapacitor material.