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<p>This study examines the electrochemical performance of nickel-modified glassy carbon electrodes (GCEs) deposited from ionic liquid, typically ethaline, (Ni<sub>IL</sub>/GC) and aqueous solutions (Ni<sub>AQ</sub>/GC) for glucose oxidation. SEM analysis shows a fine-grained, nanostructured morphology with microcracks in the ionic liquid-deposited film. EDX confirms high nickel content (44.6%) and surface oxidation (6.8%). XRD indicates face-centered cubic nickel and nickel oxides with an average nanoparticle size of 33&#xa0;nm. Cyclic voltammetry reveals Ni<sub>IL</sub>/GC exhibits superior electron transfer and catalytic activity towards glucose oxidation, with sharper oxidation peaks and a 100&#xa0;mV cathodic shift compared to Ni<sub>AQ</sub>/GC. Nyquist plots show lower impedance for Ni<sub>IL</sub>/GC, signifying improved charge transfer efficiency. Tafel analysis shows a lower slope (30&#xa0;mV/decade) for Ni<sub>IL</sub>/GC, indicating faster glucose oxidation kinetics. The Ni<sub>IL</sub>/GC electrode also demonstrates superior stability with minimal degradation during long-term cycling. These results highlight Ni<sub>IL</sub>/GC’s enhanced electrochemical properties and stability, making it promising for glucose sensing and electrocatalytic applications.</p>

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Electrochemical performance of nickel-modified glassy carbon electrodes for glucose oxidation: ionic liquid vs. aqueous deposition methods

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月22日

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  • Narmin M. Hamadamin,
  • Hassan H. Abdallah,
  • Mohamed I. Awad

摘要

This study examines the electrochemical performance of nickel-modified glassy carbon electrodes (GCEs) deposited from ionic liquid, typically ethaline, (NiIL/GC) and aqueous solutions (NiAQ/GC) for glucose oxidation. SEM analysis shows a fine-grained, nanostructured morphology with microcracks in the ionic liquid-deposited film. EDX confirms high nickel content (44.6%) and surface oxidation (6.8%). XRD indicates face-centered cubic nickel and nickel oxides with an average nanoparticle size of 33 nm. Cyclic voltammetry reveals NiIL/GC exhibits superior electron transfer and catalytic activity towards glucose oxidation, with sharper oxidation peaks and a 100 mV cathodic shift compared to NiAQ/GC. Nyquist plots show lower impedance for NiIL/GC, signifying improved charge transfer efficiency. Tafel analysis shows a lower slope (30 mV/decade) for NiIL/GC, indicating faster glucose oxidation kinetics. The NiIL/GC electrode also demonstrates superior stability with minimal degradation during long-term cycling. These results highlight NiIL/GC’s enhanced electrochemical properties and stability, making it promising for glucose sensing and electrocatalytic applications.