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<p>A novel MnO<sub>2</sub>@MXene hybrid has been successfully fabricated using ultrasonication. Comprehensive characterization was carried out to examine its structural, morphological, optical, and surface properties through XRD, SEM, FTIR, UV-Visible spectroscopy, and BET analyses. UV-Vis spectroscopy revealed a significant bandgap reduction in the MnO<sub>2</sub>@MXene composite (1.8&#xa0;eV) compared to pure MnO<sub>2</sub> (2.2&#xa0;eV), suggesting enhanced electronic behavior and improved light absorption. BET surface area analysis further confirmed the superior specific surface area, showing a drastic increase to 767 m<sup>2</sup>/g versus 25.93 m<sup>2</sup>/g for pristine MnO<sub>2</sub>, which facilitated better ion diffusion and electrolyte accessibility. Electrochemical impedance spectroscopy (EIS), galvanostatic charge–discharge (GCD), and cyclic voltammetry (CV) were used in the electrochemical investigations, which were conducted in a 3-M H<sub>2</sub>SO<sub>4</sub> electrolyte. The MnO<sub>2</sub>@MXene electrode exhibited nearly symmetric curves at different scan rates and symmetric GCD curves, indicating classic pseudocapacitive behavior. A remarkable specific capacitance of 133.28 F/g at a current density of 1.5 A/g was obtained by MnO<sub>2</sub>@MXene hybrids, outperforming pure α-MnO<sub>2</sub> which exhibited a specific capacitance of 14.63F/g at a current density of 3 A/g. MnO<sub>2</sub>@MXene maintained a specific capacitance of 42.62 F/g even at 15 A/g, reflecting an outstanding rate capability. Moreover, MnO<sub>2</sub>@MXene attained an impressive energy density of 101.71 Wh/kg at a corresponding power density of 2670 W/kg, emphasizing its strong promise for high-efficiency, high-power energy storage systems for portable electronics electrochemical sensors and sustainable energy conversation technologies.</p> Graphical Abstract <p></p>

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Ultrasonically Engineered MnO2@MXene Composite Electrode for Enhanced Supercapacitor Performance

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • Anne Masih,
  • Vidhi,
  • Anjani Kumar Singh,
  • O. P. Thakur

摘要

A novel MnO2@MXene hybrid has been successfully fabricated using ultrasonication. Comprehensive characterization was carried out to examine its structural, morphological, optical, and surface properties through XRD, SEM, FTIR, UV-Visible spectroscopy, and BET analyses. UV-Vis spectroscopy revealed a significant bandgap reduction in the MnO2@MXene composite (1.8 eV) compared to pure MnO2 (2.2 eV), suggesting enhanced electronic behavior and improved light absorption. BET surface area analysis further confirmed the superior specific surface area, showing a drastic increase to 767 m2/g versus 25.93 m2/g for pristine MnO2, which facilitated better ion diffusion and electrolyte accessibility. Electrochemical impedance spectroscopy (EIS), galvanostatic charge–discharge (GCD), and cyclic voltammetry (CV) were used in the electrochemical investigations, which were conducted in a 3-M H2SO4 electrolyte. The MnO2@MXene electrode exhibited nearly symmetric curves at different scan rates and symmetric GCD curves, indicating classic pseudocapacitive behavior. A remarkable specific capacitance of 133.28 F/g at a current density of 1.5 A/g was obtained by MnO2@MXene hybrids, outperforming pure α-MnO2 which exhibited a specific capacitance of 14.63F/g at a current density of 3 A/g. MnO2@MXene maintained a specific capacitance of 42.62 F/g even at 15 A/g, reflecting an outstanding rate capability. Moreover, MnO2@MXene attained an impressive energy density of 101.71 Wh/kg at a corresponding power density of 2670 W/kg, emphasizing its strong promise for high-efficiency, high-power energy storage systems for portable electronics electrochemical sensors and sustainable energy conversation technologies.

Graphical Abstract