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<p>Pr<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub> (PCM) and novel rGO-Pr<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub> (RPCM) nanocomposites are successfully synthesized by solid-state reaction and a hydrothermal approach, respectively. The crystal structure, surface morphology, elemental composition, and structural bonding are investigated using X-rays diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-rays spectroscopy (EDX), and Raman spectroscopy, respectively. The nanocomposites are characterized by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), electrochemical impedance spectroscopy (EIS), and a stability test. Electrochemical assessments using a 3-electrode system in 2&#xa0;M KOH unveil the synergistic properties of RPCM (rGO-Pr<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub>). The specific capacitance of Pr<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub>, rGO, and rGO-Pr<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub> nanocomposite are found to be 562&#xa0;F/g, 687&#xa0;F/g, and 750&#xa0;F/g at a scan rate of 20&#xa0;mV/s. The rGO-Pr<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub> nanocomposite presents the notable energy density of 43.7&#xa0;Wh/kg at 3&#xa0;A/g current density. The electrolyte resistance of the nanocomposite is found to be 5 Ω, while that of the active electrode is 0.012 Ω, showing excellent capacitive performance through low charge transfer resistance. During the stability test, the novel rGO-Pr<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub> nanocomposite provides an outstanding retention of 85% after 4500 cycles. The novel aspect of this work lies in the synergistic integration of reduced graphene oxide (rGO) with Pr<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub>, combining the high electrical conductivity and surface area of rGO with the excellent electrochemical stability of the perovskite structure. Our approach enhances charge storage capabilities, as demonstrated by significant improvements in cyclic voltammetry (CV) performance, with a notable increase in specific capacitance, charge–discharge stability and energy density. This novel composite material offers a promising pathway for the development of high-performance supercapacitors, addressing the limitations of existing electrode materials.</p>

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rGO-Pr0.5Ca0.5MnO3 Nanocomposites: A Path to High-Energy Density Supercapacitors

  • 期刊论文

  • 发表日期：

    2025年1月13日

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  • Kamran Shahzad,
  • Muhammad Rahim,
  • Hafiz Zahid Shafi,
  • Attaullah Shah,
  • Imosobomeh L. Ikhioya

摘要

Pr0.5Ca0.5MnO3 (PCM) and novel rGO-Pr0.5Ca0.5MnO3 (RPCM) nanocomposites are successfully synthesized by solid-state reaction and a hydrothermal approach, respectively. The crystal structure, surface morphology, elemental composition, and structural bonding are investigated using X-rays diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-rays spectroscopy (EDX), and Raman spectroscopy, respectively. The nanocomposites are characterized by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), electrochemical impedance spectroscopy (EIS), and a stability test. Electrochemical assessments using a 3-electrode system in 2 M KOH unveil the synergistic properties of RPCM (rGO-Pr0.5Ca0.5MnO3). The specific capacitance of Pr0.5Ca0.5MnO3, rGO, and rGO-Pr0.5Ca0.5MnO3 nanocomposite are found to be 562 F/g, 687 F/g, and 750 F/g at a scan rate of 20 mV/s. The rGO-Pr0.5Ca0.5MnO3 nanocomposite presents the notable energy density of 43.7 Wh/kg at 3 A/g current density. The electrolyte resistance of the nanocomposite is found to be 5 Ω, while that of the active electrode is 0.012 Ω, showing excellent capacitive performance through low charge transfer resistance. During the stability test, the novel rGO-Pr0.5Ca0.5MnO3 nanocomposite provides an outstanding retention of 85% after 4500 cycles. The novel aspect of this work lies in the synergistic integration of reduced graphene oxide (rGO) with Pr0.5Ca0.5MnO3, combining the high electrical conductivity and surface area of rGO with the excellent electrochemical stability of the perovskite structure. Our approach enhances charge storage capabilities, as demonstrated by significant improvements in cyclic voltammetry (CV) performance, with a notable increase in specific capacitance, charge–discharge stability and energy density. This novel composite material offers a promising pathway for the development of high-performance supercapacitors, addressing the limitations of existing electrode materials.