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<p>In the pursuit of high-performance energy storage systems, supercapacitors have emerged as essential devices due to their high-power density, long cycle life, and rapid charge-discharge capabilities. Among various electrode materials, nanostructured metal oxides such as Fe₂O<sub>3</sub>(iron ferrite) have garnered significant attention for their cost-effectiveness, environmental benignity, and excellent pseudocapacitive behavior. In this study, Fe₂O<sub>3</sub> nanomaterials were synthesized using the spray pyrolysis technique, offering a scalable and low-cost route to produce uniform and porous thin films. Structural characterization through X-ray diffraction (XRD) confirmed the formation of a pure spinel ferrite phase, while scanning electron microscopy (SEM) revealed interconnected spherical nanostructures with a high surface area. The UV-Vis absorption spectra revealed strong absorption in the visible region, and the estimated optical band gap of the synthesized material was found to be approximately band gap value is 2.1&#xa0;eV, indicating its n-type semiconductor nature. Electrochemical performance evaluated via cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS) demonstrated a high specific capacitance of ~ 420&#xa0;F/g at 2&#xa0;mA/cm², excellent rate capability, and good cycling stability. EIS analysis revealed low series (18 Ω) and charge transfer resistance (4.3 Ω), indicating efficient electron transport and redox activity. These results validate the potential of Fe₂O<sub>3</sub> nanomaterials synthesized via spray pyrolysis as efficient electrode materials for next-generation supercapacitor devices.</p>

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Engineering spinel Fe₂O3 nanostructures for sustainable energy storage: A spray pyrolysis approach

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • V. D. Patil,
  • A. L. Jadhav,
  • D. A. Patil,
  • A. V. Kadam,
  • B. M. Mandlekar,
  • Nilofar Mulla,
  • S. L. Jadhav

摘要

In the pursuit of high-performance energy storage systems, supercapacitors have emerged as essential devices due to their high-power density, long cycle life, and rapid charge-discharge capabilities. Among various electrode materials, nanostructured metal oxides such as Fe₂O3(iron ferrite) have garnered significant attention for their cost-effectiveness, environmental benignity, and excellent pseudocapacitive behavior. In this study, Fe₂O3 nanomaterials were synthesized using the spray pyrolysis technique, offering a scalable and low-cost route to produce uniform and porous thin films. Structural characterization through X-ray diffraction (XRD) confirmed the formation of a pure spinel ferrite phase, while scanning electron microscopy (SEM) revealed interconnected spherical nanostructures with a high surface area. The UV-Vis absorption spectra revealed strong absorption in the visible region, and the estimated optical band gap of the synthesized material was found to be approximately band gap value is 2.1 eV, indicating its n-type semiconductor nature. Electrochemical performance evaluated via cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS) demonstrated a high specific capacitance of ~ 420 F/g at 2 mA/cm², excellent rate capability, and good cycling stability. EIS analysis revealed low series (18 Ω) and charge transfer resistance (4.3 Ω), indicating efficient electron transport and redox activity. These results validate the potential of Fe₂O3 nanomaterials synthesized via spray pyrolysis as efficient electrode materials for next-generation supercapacitor devices.