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<p>The rational design of electrode materials is critical for achieving high performance in non-enzymatic glucose sensing. In this work, a sea urchin-like NiO-Co<sub>3</sub>O<sub>4</sub> composite was successfully fabricated via a facile hydrothermal method followed by calcination. The morphology, crystal structure, and elemental composition of the as-prepared material were systematically characterized using SEM, EDS, TEM, XRD, and XPS. Benefiting from its unique hierarchical structure assembled from interconnected nanorods, which provides a large electroactive surface area and facilitates charge transfer, the NiO-Co<sub>3</sub>O<sub>4</sub> modified electrode exhibited excellent electrochemical performance towards glucose oxidation. The sensor demonstrated a low detection limit of 0.4 µM, high selectivity against common interfering species (AA, UA, and NaCl, etc), and good operational stability. Electrochemical kinetics analysis revealed that the glucose oxidation on the NiO-Co<sub>3</sub>O<sub>4</sub> electrode is a reversible and diffusion-controlled process. This work highlights the significance of morphological engineering in metal oxide composites and provides a candidate electrode material for reliable non-enzymatic glucose detection.</p>

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Fabrication of Sea Urchin-Like NiO-Co3O4 Composite Materials for Enhanced Electrocatalytic Glucose Oxidation

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Runhua Qin,
  • Xuan Zhang,
  • Jiaquan Xu,
  • Shujuan Song,
  • Yingfei Hu

摘要

The rational design of electrode materials is critical for achieving high performance in non-enzymatic glucose sensing. In this work, a sea urchin-like NiO-Co3O4 composite was successfully fabricated via a facile hydrothermal method followed by calcination. The morphology, crystal structure, and elemental composition of the as-prepared material were systematically characterized using SEM, EDS, TEM, XRD, and XPS. Benefiting from its unique hierarchical structure assembled from interconnected nanorods, which provides a large electroactive surface area and facilitates charge transfer, the NiO-Co3O4 modified electrode exhibited excellent electrochemical performance towards glucose oxidation. The sensor demonstrated a low detection limit of 0.4 µM, high selectivity against common interfering species (AA, UA, and NaCl, etc), and good operational stability. Electrochemical kinetics analysis revealed that the glucose oxidation on the NiO-Co3O4 electrode is a reversible and diffusion-controlled process. This work highlights the significance of morphological engineering in metal oxide composites and provides a candidate electrode material for reliable non-enzymatic glucose detection.