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<p>In this study, single-phase spinel ferrites Zn<sub>0.5</sub>(TM)<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> (TM = Co, Cu, and Ni) were synthesized via a solid-state synthesis route. The site occupancy behavior of transition metals (TMs) at the octahedral and tetrahedral sites was elucidated using Raman spectroscopy. The particle size of the samples influenced the optical band gap, and thus the electrochemical performance. The smaller particle sizes reduced the diffusion length, increased the surface area, and facilitated the interaction between electrolyte and active material on the electrode surface. As a result, Ni-based samples exhibited the highest specific capacity among all the samples. Electrochemical impedance spectroscopy demonstrated that Zn<sub>0.5</sub>Ni<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> displayed rapid Li<sup>+</sup> diffusion kinetics, likely attributed to the abundance of active sites and large surface area associated with smaller particle sizes. Galvanostatic charge–discharge, cycling, and rate performance evaluations underscored the superior electrochemical properties of Zn<sub>0.5</sub>Ni<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub>. </p>

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Micron-scale insight into the electrochemical performance of Zn0.5(TM)0.5Fe2O4

  • 期刊论文

  • 发表日期：

    2025年6月21日

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  • Raja Umair Khan,
  • Raz Muhammad,
  • Basit Ali,
  • Abdus Samad,
  • Xueqing Yu,
  • Kaixin Song

摘要

In this study, single-phase spinel ferrites Zn0.5(TM)0.5Fe2O4 (TM = Co, Cu, and Ni) were synthesized via a solid-state synthesis route. The site occupancy behavior of transition metals (TMs) at the octahedral and tetrahedral sites was elucidated using Raman spectroscopy. The particle size of the samples influenced the optical band gap, and thus the electrochemical performance. The smaller particle sizes reduced the diffusion length, increased the surface area, and facilitated the interaction between electrolyte and active material on the electrode surface. As a result, Ni-based samples exhibited the highest specific capacity among all the samples. Electrochemical impedance spectroscopy demonstrated that Zn0.5Ni0.5Fe2O4 displayed rapid Li+ diffusion kinetics, likely attributed to the abundance of active sites and large surface area associated with smaller particle sizes. Galvanostatic charge–discharge, cycling, and rate performance evaluations underscored the superior electrochemical properties of Zn0.5Ni0.5Fe2O4.