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<p>A straightforward hydrothermal technique is employed to synthesize nanocomposites of manganese dioxide/reduced graphene oxide (MnO<sub>2</sub>/rGO). To synthesize different nanocomposites (MR1, MR2, MR3, and MR4), the amount of manganese oxide (MnO<sub>2</sub>) is kept constant, and the mass of rGO is varied as 25, 50, 75, and 100&#xa0;mg. The atomic structure, functional groups, surface structure, and elemental profile of the pure MnO<sub>2</sub> and MnO<sub>2</sub>/rGO nanocomposites are analysed using XRD, FTIR, HRSEM, and EDX techniques. HRTEM study confirmed the anchoring of MnO<sub>2</sub> nanorods onto the rGO surface and thereby paved the way for the enhanced energy storage properties of the nanocomposites developed in this work. The electrochemical performance of the prepared samples is investigated using galvanostatic charge–discharge (GCD), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) techniques. Among the nanocomposite samples, MR3 showed the&#xa0;highest specific capacitance of 777.2 Fg<sup>-</sup>1, emphasizing their considerable potential as an electrode substance for high-performance supercapacitor applications.</p>

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A facile hydrothermal synthesis of MnO2/rGO nanocomposites with enhanced electrochemical performance for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • P. Shobha,
  • A. R. Baby Suganthi,
  • P. Sagayaraj,
  • S. Selvakumar,
  • S. Joseph Manoj Babu,
  • R. Gunaseelan,
  • S. Amala Jayanthi

摘要

A straightforward hydrothermal technique is employed to synthesize nanocomposites of manganese dioxide/reduced graphene oxide (MnO2/rGO). To synthesize different nanocomposites (MR1, MR2, MR3, and MR4), the amount of manganese oxide (MnO2) is kept constant, and the mass of rGO is varied as 25, 50, 75, and 100 mg. The atomic structure, functional groups, surface structure, and elemental profile of the pure MnO2 and MnO2/rGO nanocomposites are analysed using XRD, FTIR, HRSEM, and EDX techniques. HRTEM study confirmed the anchoring of MnO2 nanorods onto the rGO surface and thereby paved the way for the enhanced energy storage properties of the nanocomposites developed in this work. The electrochemical performance of the prepared samples is investigated using galvanostatic charge–discharge (GCD), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) techniques. Among the nanocomposite samples, MR3 showed the highest specific capacitance of 777.2 Fg-1, emphasizing their considerable potential as an electrode substance for high-performance supercapacitor applications.