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<p>Nitrite, as a widely used food additive, has incurred numerous food safety issues due to excessive use. Therefore, developing efficient and sensitive detection methods for nitrite is crucial for assessing its ecological and environmental risks associated with its overexposure. In this study, a facile preparation strategy combining electrodeposition with thermal annealing was innovatively employed to successfully construct the Fe-Co bimetallic composite self-supported on the surfaces of commercial nickel foam substrate (Fe-Co/NF). On the one hand, the in situ assembled Fe-Co composite presents a uniform array of grape bunch-like structures and plenty of interconnected gully constructions. This microstructure can impart the synergistic advantages of a dimensional skeleton, high-specific surface area, and abundantly exposed bimetallic active sites, which can significantly improve the interfacial reaction kinetics by optimizing the electron conduction pathways. On the other hand, the Fe-Co composite consists of CoFe<sub>2</sub>O<sub>4</sub> as the primary active phase and Co<sub>3</sub>O<sub>4</sub> as the secondary component. The metal–oxygen bond length in CoFe<sub>2</sub>O<sub>4</sub> can be orchestrated via optimizing the synthetic parameters, thereby boosting the adsorption and enrichment of nitrite on the electrode surface, creating favorable conditions for trace detection. The experimental results show that the sensor exhibits a wide linear response range (4–1610&#xa0;μM), a detection limit as low as 0.319&#xa0;μM, high sensitivity (3250 μA mM<sup>−1</sup>&#xa0;cm<sup>−2</sup>), and excellent anti-interference capability and stability. This design concept of assembling the self-supported hierarchical microstructure provides a new idea for constructing superior electrochemical sensing electrodes.</p>

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Self-supported Fe-Co/NF electrode for sensitive electrochemical detection of nitrite

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Zhichao Wang,
  • Yunjie Wang,
  • Lianxin Gong,
  • Lin Gong,
  • Rui Jian,
  • Jie Wang,
  • Jinlong Che,
  • Si Chen,
  • Yufeng Zhang,
  • Zhenglong Zhao,
  • Yachao Zhu,
  • Luming Li,
  • Jie Deng

摘要

Nitrite, as a widely used food additive, has incurred numerous food safety issues due to excessive use. Therefore, developing efficient and sensitive detection methods for nitrite is crucial for assessing its ecological and environmental risks associated with its overexposure. In this study, a facile preparation strategy combining electrodeposition with thermal annealing was innovatively employed to successfully construct the Fe-Co bimetallic composite self-supported on the surfaces of commercial nickel foam substrate (Fe-Co/NF). On the one hand, the in situ assembled Fe-Co composite presents a uniform array of grape bunch-like structures and plenty of interconnected gully constructions. This microstructure can impart the synergistic advantages of a dimensional skeleton, high-specific surface area, and abundantly exposed bimetallic active sites, which can significantly improve the interfacial reaction kinetics by optimizing the electron conduction pathways. On the other hand, the Fe-Co composite consists of CoFe2O4 as the primary active phase and Co3O4 as the secondary component. The metal–oxygen bond length in CoFe2O4 can be orchestrated via optimizing the synthetic parameters, thereby boosting the adsorption and enrichment of nitrite on the electrode surface, creating favorable conditions for trace detection. The experimental results show that the sensor exhibits a wide linear response range (4–1610 μM), a detection limit as low as 0.319 μM, high sensitivity (3250 μA mM−1 cm−2), and excellent anti-interference capability and stability. This design concept of assembling the self-supported hierarchical microstructure provides a new idea for constructing superior electrochemical sensing electrodes.