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<p>The cobalt substituted α-MnO<sub>2</sub> nanorods were prepared by co-precipitation method. The effect of cobalt (Co) substitution on the synthesized samples were studied by structural, functional, morphological, optical, and electrochemical properties. XRD studies revealed that Co substituted α-MnO<sub>2</sub> nanorods possessed a tetragonal structure. The morphological observation confirmed a rod-like structure, as evidenced by HRSEM and HRTEM analysis. EDS mapping analysis indicated an even distribution of Co ions within the α-MnO₂ lattice, which contributed to the enhanced electrochemical performance of the Co-substituted samples as supercapacitor electrodes. The surface area of Co substituted α-MnO<sub>2</sub> nanorods was measured using BET analysis and found to be 158 m<sup>2</sup>/g. The optical bandgap values were found to increase with higher cobalt concentration. The electrochemical characteristics of the prepared electrodes were examined by using CV, GCD and EIS spectroscopy. The Co-substituted α-MnO₂ electrode exhibited a specific capacitance of 618 Fg<sup>− 1</sup> at a scan rate of 5 mV s<sup>− 1</sup>, as determined from cyclic voltammetry measurements.</p>

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Investigation of enhanced Cobalt substituted α-MnO2 nanorods for potential use as electrodes in energy storage applications

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • S. Kirtuhika,
  • K. Ramesh,
  • G. Viruthagiri,
  • T. Thilagavathi,
  • K. Paramasivam,
  • C. Parthiban

摘要

The cobalt substituted α-MnO2 nanorods were prepared by co-precipitation method. The effect of cobalt (Co) substitution on the synthesized samples were studied by structural, functional, morphological, optical, and electrochemical properties. XRD studies revealed that Co substituted α-MnO2 nanorods possessed a tetragonal structure. The morphological observation confirmed a rod-like structure, as evidenced by HRSEM and HRTEM analysis. EDS mapping analysis indicated an even distribution of Co ions within the α-MnO₂ lattice, which contributed to the enhanced electrochemical performance of the Co-substituted samples as supercapacitor electrodes. The surface area of Co substituted α-MnO2 nanorods was measured using BET analysis and found to be 158 m2/g. The optical bandgap values were found to increase with higher cobalt concentration. The electrochemical characteristics of the prepared electrodes were examined by using CV, GCD and EIS spectroscopy. The Co-substituted α-MnO₂ electrode exhibited a specific capacitance of 618 Fg− 1 at a scan rate of 5 mV s− 1, as determined from cyclic voltammetry measurements.