In this work, we developed a Sr-doped FeNi-S nanoparticle by a simple one-step pyrolysis process and successfully integrated it with single-walled carbon nanotubes (Sr@FeNi-S/SWCNTs) using an ultrasonication method. The Sr@FeNi-S/SWCNTs nanocomposite consisted of Sr, Fe, Ni, and S atoms inside the nanosized particle of Sr@FeNi-S firmly anchored on the surface of the SWCNTs. Electrochemical impedance analysis of the Sr@FeNi-S/SWCNTs electrode shows favorable kinetic charges for transport compared to those of Sr@FeNi-S and SWCNTs. A glassy carbon electrode modified with Sr@FeNi-S/SWCNTs is constructed and used for the selective and sensitive electrochemical determination of trace amounts of mercury (Hg^(II)). The electrochemical behavior of the modified electrode and the mechanism of the Hg^(II) were investigated by cyclic voltammetry. By differential pulse voltammetry at optimum parameters such as a wide linear range (WLR: 0.05–279 μM), an ultralow level detection limit (LOD: 0.52 nM) of Hg^(II) is observed with a sensitivity of 1.838 μA μM^–1 cm^–2. The practical feasibility of the electrode was assessed in lake water and river water samples with satisfactory recovery results of Hg^(II) added. Moreover, this work not only demonstrates the tremendous potential of electrochemical detection of Hg^(II) but also highlights a simple and robust methodology to develop material discovery and design for improved electrochemical performance.

中文翻译：

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具有优异电催化活性的Sr @ FeNi-S纳米/碳纳米管纳米复合材料用于电化学检测有毒汞（II）

在这项工作中，我们通过简单的一步热解工艺开发了一种掺Sr的FeNi-S纳米颗粒，并使用超声方法成功地将其与单壁碳纳米管（Sr @ FeNi-S / SWCNTs）集成。Sr @ FeNi-S / SWCNTs纳米复合材料由Sr，Fe，Ni和S原子组成，它们牢固地固定在SWCNTs的表面上。与Sr @ FeNi-S和SWCNTs相比，Sr @ FeNi-S / SWCNTs电极的电化学阻抗分析显示出有利的运输动电荷。构造了一个用Sr @ FeNi-S / SWCNT修饰的玻璃碳电极，用于选择性和灵敏的电化学测定痕量汞（Hg ^（II））。修饰电极的电化学行为及汞的机理^（II）通过循环伏安法进行了研究。通过差分脉冲伏安法在最佳参数（例如宽线性范围（WLR：0.05–279μM））下，观察到汞^（II）的超低水平检测限（LOD：0.52 nM），灵敏度为1.838μAμM ^–1 cm ^–2。在湖水和河水样品中评估了电极的实际可行性，并添加了令人满意的汞^（II）回收结果。此外，这项工作不仅证明了汞^（II）电化学检测的巨大潜力，而且强调了一种简单而可靠的方法来开发材料发现和设计以改善电化学性能。