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<p>Binary transition metal oxides possess higher electrochemical activity and are promising electrodes for supercapacitor (SCs) applications, owing to their structural, morphological, and electrochemical properties. In this study, Nickel Manganese Oxide (NMO) nanostructures were fabricated via a simple and low-cost sol-gel method. The prepared nanostructures were annealed at intervals of 100°C, from 400 to 700 °C, to get four different samples in order to study the temperature dependence of their properties and to obtain the optimized NMO sample with better electrochemical performance. Structural characterization via X-ray Diffraction (XRD) pattern study, morphological and elemental composition determination through Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray analysis (EDAX) mapping, and study of molecular vibrational modes by Fourier Transform Infrared Spectroscopy (FTIR) were carried out. X-ray Photoelectron Spectroscopy (XPS) was employed to study the elemental composition and chemical states of NiMn<sub>2</sub>O<sub>4</sub>. Cyclic voltametric measurement (CV), Galvanostatic Charge-Discharge (GCD), and Electrochemical Impedance Spectroscopy (EIS) studies were performed in a 1 M solution of potassium hydroxide (KOH) electrolyte to assess the electrochemical properties of the synthesized samples. Electrochemical measurements show that the NMO particles calcinated at 600°C exhibited the optimal supercapacitive performance, achieving a higher specific capacitance of 1073 F g⁻<sup>1</sup> and 822 F g⁻<sup>1</sup> under a scan rate of 5 mVs<sup>-1</sup> and current density of 1 Ag<sup>-</sup>,<sup>1</sup> respectively, along with 94.8% cyclic stability even after 2500 cycles. The examined value of columbic efficiency, specific power, and specific energy for the NMO electrode are 96 %, 735 W kg<sup>-1</sup>, and 28 Wh kg<sup>-1</sup>, respectively. This study investigates the crystallinity, morphological features, ion diffusion, and electrochemical performance of nickel manganese oxide nanostructures in correlation with the calcination temperature, for the design of electrode materials for supercapacitor applications.</p>

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Studies on temperature-engineered NiMn2O4 nano-electrodes in view of supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Poornima Priyadharshini Seenivasan,
  • Chitra Ravi,
  • Prithivikumaran Natarajan

摘要

Binary transition metal oxides possess higher electrochemical activity and are promising electrodes for supercapacitor (SCs) applications, owing to their structural, morphological, and electrochemical properties. In this study, Nickel Manganese Oxide (NMO) nanostructures were fabricated via a simple and low-cost sol-gel method. The prepared nanostructures were annealed at intervals of 100°C, from 400 to 700 °C, to get four different samples in order to study the temperature dependence of their properties and to obtain the optimized NMO sample with better electrochemical performance. Structural characterization via X-ray Diffraction (XRD) pattern study, morphological and elemental composition determination through Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray analysis (EDAX) mapping, and study of molecular vibrational modes by Fourier Transform Infrared Spectroscopy (FTIR) were carried out. X-ray Photoelectron Spectroscopy (XPS) was employed to study the elemental composition and chemical states of NiMn2O4. Cyclic voltametric measurement (CV), Galvanostatic Charge-Discharge (GCD), and Electrochemical Impedance Spectroscopy (EIS) studies were performed in a 1 M solution of potassium hydroxide (KOH) electrolyte to assess the electrochemical properties of the synthesized samples. Electrochemical measurements show that the NMO particles calcinated at 600°C exhibited the optimal supercapacitive performance, achieving a higher specific capacitance of 1073 F g⁻1 and 822 F g⁻1 under a scan rate of 5 mVs-1 and current density of 1 Ag-,1 respectively, along with 94.8% cyclic stability even after 2500 cycles. The examined value of columbic efficiency, specific power, and specific energy for the NMO electrode are 96 %, 735 W kg-1, and 28 Wh kg-1, respectively. This study investigates the crystallinity, morphological features, ion diffusion, and electrochemical performance of nickel manganese oxide nanostructures in correlation with the calcination temperature, for the design of electrode materials for supercapacitor applications.