Excessive residues of nitrite can pose a serious threat to human health, making the establishment of an efficient and effective electrochemical sensor for nitrite detection highly necessary. Herein, we report on a sensor based on nitrogen-doped carbon nanofibers, with FeCoNiCuAl high-entropy alloy (HEAs) nanoparticles in situ grown on the carbon fibers through a confinement effect. The FeCoNiCuAl/CNFs sensor is capable of electrochemically detecting nitrite using both differential pulse voltammetry (DPV) and amperometric (I-t) methods. The DPV detection offers a linear range of 0.1-5000 μM and 5000-18000 μM, with sensitivities of 150.6 μA mM-1 cm-2 and 80.1 μA mM-1 cm-2, and a detection limit of 0.023 μM (S/N=3). The I-t detection covers a range of 1-10000 μM, with a sensitivity of 337.84 μA mM-1 cm-2 and a detection limit of 0.12 μM. Moreover, the sensor exhibits excellent anti-interference properties, stability, and reproducibility, providing feasibility for nitrite detection in real-world environments.

中文翻译：

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用高熵合金颗粒修饰的纳米纤维用于亚硝酸盐的检测


过量的亚硝酸盐残留物会对人体健康构成严重威胁，因此非常有必要建立用于亚硝酸盐检测的高效电化学传感器。在此，我们报道了一种基于氮掺杂碳纳米纤维的传感器，其中 FeCoNiCuAl 高熵合金 （HEA） 纳米颗粒通过约束效应原位生长在碳纤维上。FeCoNiCuAl/CNFs 传感器能够使用差分脉冲伏安法 （DPV） 和安培法 （I-t） 方法对亚硝酸盐进行电化学检测。DPV 检测提供 0.1-5000 μM 和 5000-18000 μM 的线性范围，灵敏度为 150.6 μA mM-1 cm-2 和 80.1 μA mM-1 cm-2，检测限为 0.023 μM （S/N=3）。I-t 检测范围为 1-10000 μM，灵敏度为 337.84 μA mM-1 cm-2，检测限为 0.12 μM。此外，该传感器表现出优异的抗干扰性能、稳定性和重现性，为在实际环境中检测亚硝酸盐提供了可行性。