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<p>Zinc ferrite (ZnFe₂O₄) thin films were synthesized using the chemical spray pyrolysis technique with a precursor concentration of 0.025&#xa0;M and deposited onto FTO substrates at a constant temperature of 325&#xa0;°C. This work explores the potential of these thin films as electrode materials for electrochemical supercapacitor applications. A comprehensive suite of structural, morphological, elemental, optical, and electrochemical analyses was conducted to evaluate the material’s performance. XRD confirmed the formation of a well-defined cubic spinel phase with a space group of Fd-3&#xa0;m, indicating high crystallinity. FE-SEM revealed a mesoporous, grain-like surface structure, which enhances ion transport and facilitates charge storage. Optical absorption analysis showed a direct allowed bandgap transition, with a calculated energy gap of approximately 2.3&#xa0;eV, suggesting good semiconducting behavior. The electrochemical properties were studied using cyclic voltammetry in 1&#xa0;M KOH aqueous electrolyte, across a range of scan rates from 2 to 100 mVs⁻¹. The CV curves exhibited distinct redox peaks, confirming the pseudocapacitive nature of the material. The film achieved a maximum specific capacitance of 310 Fg⁻¹ at 2 mVs⁻¹. The charge-discharge analysis further validated the capacitive nature and stability of the electrode material. These findings demonstrate that ZnFe₂O₄ thin films, with their favorable morphology, redox activity, and broad electrochemical window, are strong candidates for use in next-generation, high-performance supercapacitor electrodes.</p>

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Spray pyrolysis-based preparation and electrochemical study of zinc ferrite thin film

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • D. A. Patil,
  • V. D. Patil,
  • A. L. Jadhav

摘要

Zinc ferrite (ZnFe₂O₄) thin films were synthesized using the chemical spray pyrolysis technique with a precursor concentration of 0.025 M and deposited onto FTO substrates at a constant temperature of 325 °C. This work explores the potential of these thin films as electrode materials for electrochemical supercapacitor applications. A comprehensive suite of structural, morphological, elemental, optical, and electrochemical analyses was conducted to evaluate the material’s performance. XRD confirmed the formation of a well-defined cubic spinel phase with a space group of Fd-3 m, indicating high crystallinity. FE-SEM revealed a mesoporous, grain-like surface structure, which enhances ion transport and facilitates charge storage. Optical absorption analysis showed a direct allowed bandgap transition, with a calculated energy gap of approximately 2.3 eV, suggesting good semiconducting behavior. The electrochemical properties were studied using cyclic voltammetry in 1 M KOH aqueous electrolyte, across a range of scan rates from 2 to 100 mVs⁻¹. The CV curves exhibited distinct redox peaks, confirming the pseudocapacitive nature of the material. The film achieved a maximum specific capacitance of 310 Fg⁻¹ at 2 mVs⁻¹. The charge-discharge analysis further validated the capacitive nature and stability of the electrode material. These findings demonstrate that ZnFe₂O₄ thin films, with their favorable morphology, redox activity, and broad electrochemical window, are strong candidates for use in next-generation, high-performance supercapacitor electrodes.