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<p>In this study, we synthesized a novel LaFeO<sub>3</sub>/MnO<sub>2</sub>/reduced graphene oxide (rGO) (LMR) composite via the sol–gel auto-combustion method followed by ultrasonication. Its structural, morphological, optical, magnetic, and surface characterization were performed using x-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, UV–visible spectroscopy, vibrating sample magnetometry (VSM), and Brunauer–Emmett–Teller (BET) analysis. Compared to pristine LaFeO<sub>3</sub> (LF), the LMR composite exhibited a significantly reduced bandgap (2.93&#xa0;eV versus 3.61&#xa0;eV) and a drastically higher surface area (150.12&#xa0;m<sup>2</sup>/g versus 19.96&#xa0;m<sup>2</sup>/g), indicating superior electronic properties and enhanced electrolyte interaction. Electrochemical measurements in 1&#xa0;M Na<sub>2</sub>SO<sub>4</sub> revealed that the LMR electrode delivered specific capacitance of 147.48&#xa0;F/g at 1&#xa0;A/g, which is 20% higher than LF (122.72&#xa0;F/g), and retained 92.98&#xa0;F/g at 4.5&#xa0;A/g, demonstrating outstanding rate capability. More importantly, the LMR electrode achieved an impressive energy density of 99.14&#xa0;Wh/kg at a power density of 1100&#xa0;W/kg, surpassing many previously reported LaFeO<sub>3</sub>-based systems in neutral electrolytes. These results highlight the enhanced charge storage performance due to the synergistic effect of LaFeO<sub>3</sub>, MnO<sub>2</sub>, and rGO, and underscore the potential of LMR as a high-performance and scalable electrode material for next-generation supercapacitors.</p> Graphical Abstract <p></p>

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Synthesis and Characterization of rGO-Modified LaFeO3/MnO2 Ternary Composite for Supercapacitor Applications

  • 期刊论文

  • 发表日期：

    2025年8月29日

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

摘要

In this study, we synthesized a novel LaFeO3/MnO2/reduced graphene oxide (rGO) (LMR) composite via the sol–gel auto-combustion method followed by ultrasonication. Its structural, morphological, optical, magnetic, and surface characterization were performed using x-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, UV–visible spectroscopy, vibrating sample magnetometry (VSM), and Brunauer–Emmett–Teller (BET) analysis. Compared to pristine LaFeO3 (LF), the LMR composite exhibited a significantly reduced bandgap (2.93 eV versus 3.61 eV) and a drastically higher surface area (150.12 m2/g versus 19.96 m2/g), indicating superior electronic properties and enhanced electrolyte interaction. Electrochemical measurements in 1 M Na2SO4 revealed that the LMR electrode delivered specific capacitance of 147.48 F/g at 1 A/g, which is 20% higher than LF (122.72 F/g), and retained 92.98 F/g at 4.5 A/g, demonstrating outstanding rate capability. More importantly, the LMR electrode achieved an impressive energy density of 99.14 Wh/kg at a power density of 1100 W/kg, surpassing many previously reported LaFeO3-based systems in neutral electrolytes. These results highlight the enhanced charge storage performance due to the synergistic effect of LaFeO3, MnO2, and rGO, and underscore the potential of LMR as a high-performance and scalable electrode material for next-generation supercapacitors.

Graphical Abstract