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<p> A&#xa0;coordination-driven synthetic approach is proposed&#xa0;to engineer Ru-Nb<sub>2</sub>O<sub>5</sub>-HGQD nanoreactor through synergistic assembly of histidine-functionalized graphene quantum dot (HGQD). The approach involves sequential coordination of niobium oxalate and ruthenium chloride with HGQD, forming water-soluble Ru/Nb-HGQD precursor, followed by two-stage controlled thermal annealing in N<sub>2</sub> to yield Ru-Nb<sub>2</sub>O<sub>5</sub>-HGQD. The resulting Ru-Nb<sub>2</sub>O<sub>5</sub>-HGQD offers a quasi-spherical morphology (46.5 ± 1.4&#xa0;nm) featuring Ru-embedded interconnected nanochannels, abundant low-valent Nb species, and graphene-modified interfaces. This unique architecture facilitates enhanced electron/ion transport kinetics, exposes catalytically active sites, and amplifies interfacial interactions with polar electrolyte. The incorporation of Nb<sub>2</sub>O<sub>5</sub> elevates the electrochemically active surface area by 1.55-fold, resulting in more than 2.24-fold enhancement in catalytic activity over Ru-HGQD. The ascorbic acid sensor with Ru-Nb<sub>2</sub>O<sub>5</sub>-HGQD demonstrates a broad linear range (0–600&#xa0;μM) at 0.056&#xa0;V, an ultralow detection limit (1.2 × 10<sup>−8</sup>&#xa0;M, <i>S</i>/<i>N</i> = 3), and exceptional selectivity against interferents. Long-term stability and reproducibility further validate its reliability for ascorbic acid quantification in fresh juice. This work also establishes a paradigm for designing high-performance oxide-supported metal nanomaterials in sensing, catalysis, and energy storage and conversion.</p> Graphical Abstract <p></p>

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Coordination-engineered Ru-Nb2O5 nanoreactor integrated with histidine-functionalized graphene quantum dot for ultrasensitive and selective electrochemical detection of ascorbic acid in fresh juices

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Wang Ye,
  • Li Xiaoshan,
  • Li Ruiyi,
  • Li Zaijun

摘要

A coordination-driven synthetic approach is proposed to engineer Ru-Nb2O5-HGQD nanoreactor through synergistic assembly of histidine-functionalized graphene quantum dot (HGQD). The approach involves sequential coordination of niobium oxalate and ruthenium chloride with HGQD, forming water-soluble Ru/Nb-HGQD precursor, followed by two-stage controlled thermal annealing in N2 to yield Ru-Nb2O5-HGQD. The resulting Ru-Nb2O5-HGQD offers a quasi-spherical morphology (46.5 ± 1.4 nm) featuring Ru-embedded interconnected nanochannels, abundant low-valent Nb species, and graphene-modified interfaces. This unique architecture facilitates enhanced electron/ion transport kinetics, exposes catalytically active sites, and amplifies interfacial interactions with polar electrolyte. The incorporation of Nb2O5 elevates the electrochemically active surface area by 1.55-fold, resulting in more than 2.24-fold enhancement in catalytic activity over Ru-HGQD. The ascorbic acid sensor with Ru-Nb2O5-HGQD demonstrates a broad linear range (0–600 μM) at 0.056 V, an ultralow detection limit (1.2 × 10−8 M, S/N = 3), and exceptional selectivity against interferents. Long-term stability and reproducibility further validate its reliability for ascorbic acid quantification in fresh juice. This work also establishes a paradigm for designing high-performance oxide-supported metal nanomaterials in sensing, catalysis, and energy storage and conversion.

Graphical Abstract