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<p>The growing demand for efficient energy storage systems has spotlighted electrochemical supercapacitors as promising candidates. This study focuses on the synthesis of ZnFe₂O₄ thin films via spray pyrolysis at varying substrate temperatures, and investigates their structural, morphological, elemental, optical, and electrochemical properties. X-ray diffraction (XRD) confirmed the formation of a cubic spinel structure, while field emission scanning electron microscopy (FE-SEM) revealed a spherical nanogranular morphology. Electrochemical testing demonstrated that films deposited at 400 °C achieved the highest specific capacitance of 349 F g⁻<sup>1</sup> at 1&#xa0;mA&#xa0;cm⁻<sup>2</sup> current density. Furthermore, the films retained 79.78% of their capacitance after 5000 cycles at 5&#xa0;mA&#xa0;cm⁻<sup>2</sup> current density. Electrochemical impedance spectroscopy (EIS) revealed a low solution resistance of 0.34 Ω and a charge transfer resistance of 12.30 Ω. These findings underscore the potential of ZnFe₂O₄ thin films as high-performance electrode materials for supercapacitor applications.</p>

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From nanograins to energy gains: Substrate temperature-driven performance in zinc ferrite thin films

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Vijay B. Zadke,
  • Maruti B. Kumbhar,
  • Vinod V. Patil,
  • Revati U. Shelke,
  • Mangesh B. Awale,
  • Lahu H. Kathwate,
  • Prakash M. Kulal,
  • Rangrao V. Suryawanshi

摘要

The growing demand for efficient energy storage systems has spotlighted electrochemical supercapacitors as promising candidates. This study focuses on the synthesis of ZnFe₂O₄ thin films via spray pyrolysis at varying substrate temperatures, and investigates their structural, morphological, elemental, optical, and electrochemical properties. X-ray diffraction (XRD) confirmed the formation of a cubic spinel structure, while field emission scanning electron microscopy (FE-SEM) revealed a spherical nanogranular morphology. Electrochemical testing demonstrated that films deposited at 400 °C achieved the highest specific capacitance of 349 F g⁻1 at 1 mA cm⁻2 current density. Furthermore, the films retained 79.78% of their capacitance after 5000 cycles at 5 mA cm⁻2 current density. Electrochemical impedance spectroscopy (EIS) revealed a low solution resistance of 0.34 Ω and a charge transfer resistance of 12.30 Ω. These findings underscore the potential of ZnFe₂O₄ thin films as high-performance electrode materials for supercapacitor applications.