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<p>Supercapacitors have emerged as critical energy storage devices due to their fast charge-discharge cycles and high-power density. Nickel oxide (NiO), with its unusual pseudocapacitive characteristics, high conductivity, and environmental friendliness, has received a lot of attention for these applications. This research focuses on the synthesis, characterizations, and electrochemical assessment of NiO thin films electrodeposited on stainless steel substrates and annealed at various temperatures (300&#xa0;°C to 600&#xa0;°C). The NiO films’ structural and morphological features were studied using x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive x-ray analysis (EDAX), and Raman spectroscopy. The results showed that NiO annealed at 500&#xa0;°C (NiO-5) had excellent crystallinity and a nanocube-like morphology, resulting in increased electroactive surface area and ion accessibility. Water contact angle study revealed that NiO-5 maintained a mix of wettability and structural integrity, bolstering its exceptional electrochemical performance. Electrochemical experiments using cyclic voltammetry (CV) in 0.1&#xa0;M NaOH revealed that NiO-5 had the highest specific capacitance due to its optimum nanostructure and improved redox activity. Stability tests indicated exceptional cycling durability, with 84.95% capacitance retention after 500 cycles. Impedance spectroscopy proved NiO-5’s effective electrochemical behaviour. These findings demonstrate the importance of morphological and structural optimization in improving the performance of NiO-based supercapacitors, paving the path for their use in high-performance energy storage systems.</p>

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Role of annealing in enhancing the electrochemical properties of NiO thin films

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Shaukat L. Tamboli,
  • Alfiya Nadeghar,
  • Gajanan M. Hingangavkar,
  • Sushilkumar S. Bandgar,
  • Dinesh P. Shinde,
  • Shailesh G. Pawar,
  • Chetan V. Chanmal,
  • Ekanath K. Kore,
  • Sanjeev D. Chavan

摘要

Supercapacitors have emerged as critical energy storage devices due to their fast charge-discharge cycles and high-power density. Nickel oxide (NiO), with its unusual pseudocapacitive characteristics, high conductivity, and environmental friendliness, has received a lot of attention for these applications. This research focuses on the synthesis, characterizations, and electrochemical assessment of NiO thin films electrodeposited on stainless steel substrates and annealed at various temperatures (300 °C to 600 °C). The NiO films’ structural and morphological features were studied using x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive x-ray analysis (EDAX), and Raman spectroscopy. The results showed that NiO annealed at 500 °C (NiO-5) had excellent crystallinity and a nanocube-like morphology, resulting in increased electroactive surface area and ion accessibility. Water contact angle study revealed that NiO-5 maintained a mix of wettability and structural integrity, bolstering its exceptional electrochemical performance. Electrochemical experiments using cyclic voltammetry (CV) in 0.1 M NaOH revealed that NiO-5 had the highest specific capacitance due to its optimum nanostructure and improved redox activity. Stability tests indicated exceptional cycling durability, with 84.95% capacitance retention after 500 cycles. Impedance spectroscopy proved NiO-5’s effective electrochemical behaviour. These findings demonstrate the importance of morphological and structural optimization in improving the performance of NiO-based supercapacitors, paving the path for their use in high-performance energy storage systems.