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<p>In the field of energy storage, transition metal oxide thin films have become an exceptional candidate for electrode fabrication in recent times. In this study, we attempt to figure out the influence of annealing temperature on the structure and surface morphology, and also the impact on electrolyte ion transfer kinetics through porous NiCo<sub>2</sub>O<sub>4</sub> (NCO) electrodes. NCO thin films have been efficaciously synthesized on conductive stainless steel (SS-304) substrate by using the potentiostatic electrodeposition technique followed by annealing at different temperatures (350℃, 400℃, and 450℃). The galvanostatic charge-discharge (GCD) plateaus reveal NCO-350 electrode exhibits a maximum specific capacitance of 896&#xa0;F/g at 1&#xa0;A/g. Electrochemical impedance spectroscopy (EIS) results suggest minimal diffusion resistance of the electrolyte ions confirming good conductive nature of the samples. After 3000 cyclic voltammetry (CV) cycles, the NCO-450 electrode possesses the highest capacitance retention value of 94.9% among all three electrodes. The overall electrochemical performance highlights the potential of NiCo<sub>2</sub>O<sub>4</sub> thin films as efficient electrode materials for high-performance supercapacitors.</p> Graphical Abstract <p></p>

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Electrochemical Study of Binder-Free Electrodeposited NiCo2O4 Thin Film: Influence of Annealing Temperature

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Roupya Gopal Ghosh,
  • Shradha Roy,
  • Partha Mitra,
  • Ayan Mukherjee

摘要

In the field of energy storage, transition metal oxide thin films have become an exceptional candidate for electrode fabrication in recent times. In this study, we attempt to figure out the influence of annealing temperature on the structure and surface morphology, and also the impact on electrolyte ion transfer kinetics through porous NiCo2O4 (NCO) electrodes. NCO thin films have been efficaciously synthesized on conductive stainless steel (SS-304) substrate by using the potentiostatic electrodeposition technique followed by annealing at different temperatures (350℃, 400℃, and 450℃). The galvanostatic charge-discharge (GCD) plateaus reveal NCO-350 electrode exhibits a maximum specific capacitance of 896 F/g at 1 A/g. Electrochemical impedance spectroscopy (EIS) results suggest minimal diffusion resistance of the electrolyte ions confirming good conductive nature of the samples. After 3000 cyclic voltammetry (CV) cycles, the NCO-450 electrode possesses the highest capacitance retention value of 94.9% among all three electrodes. The overall electrochemical performance highlights the potential of NiCo2O4 thin films as efficient electrode materials for high-performance supercapacitors.

Graphical Abstract