An efficient non‐noble metal eletrocatalyst, nickel hydroxide/reduced graphene oxide nanocomposite (Ni(OH)₂/sr‐GO), is synthesized in the absence of reductants and alkali by a simple one‐step solvothermal method. The morphology, structure, and composition of the Ni(OH)₂/sr‐GO nanocomposite is characterized by various analytical techniques like scanning electron microscopy, X‐ray diffraction, Raman spectroscopy, X‐ray photoelectron spectroscopy, and energy dispersive X‐ray spectroscopy. The Ni(OH)₂/sr‐GO nanocomposite is then used to construct a nonenzymatic amperometric sensor for highly sensitive detection of nitrite. The result shows that the Ni(OH)₂/sr‐GO nanocomposite possesses superior electrocatalytic ability toward nitrite. The electrochemical performance of the Ni(OH)₂/sr‐GO is evaluated by electrochemical impedance spectroscopy, chronocoulometry, and cyclic voltammetry. Under the optimal conditions, the electrochemical sensor for nitrite detection exhibits a linear range from 0.1 to 663.6 μM, with a detection limit of 0.07 μM (S/N=3). In addition, the sensor provides favorable selectivity, reproducibility, and stability, and can be successfully applied for the detection of nitrite in spiked water samples. Recoveries range between 95 and 108 %.

中文翻译：

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基于氢氧化镍和还原石墨烯的纳米复合材料的亚硝酸盐检测非酶安培传感器

一种有效的非贵金属电催化剂，氢氧化镍/还原的氧化石墨烯纳米复合材料（Ni（OH）₂ / sr-GO），是通过简单的一步溶剂热法在不存在还原剂和碱的情况下合成的。Ni（OH）₂ / sr-GO纳米复合材料的形态，结构和组成通过多种分析技术来表征，例如扫描电子显微镜，X射线衍射，拉曼光谱，X射线光电子能谱和能量色散X射线光谱学。然后将Ni（OH）₂ / sr-GO纳米复合材料用于构建非酶安培传感器，用于亚硝酸盐的高灵敏度检测。结果表明，Ni（OH）₂/ sr-GO纳米复合材料对亚硝酸盐具有出色的电催化能力。Ni（OH）₂ / sr-GO的电化学性能通过电化学阻抗谱，计时库仑法和循环伏安法进行评估。在最佳条件下，用于亚硝酸盐检测的电化学传感器的线性范围为0.1至663.6μM，检测极限为0.07μM（S / N = 3）。此外，该传感器具有良好的选择性，可重复性和稳定性，可成功用于加标水样中亚硝酸盐的检测。回收率介于95％至108％之间。