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首页> 外文期刊>Electroanalysis >Nonenzymatic Amperometric Sensor for Nitrite Detection Based on a Nanocomposite Consisting of Nickel Hydroxide and Reduced Graphene Oxide
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Nonenzymatic Amperometric Sensor for Nitrite Detection Based on a Nanocomposite Consisting of Nickel Hydroxide and Reduced Graphene Oxide

机译：基于氢氧化镍和石墨烯氧化镍组成的纳米复合材料，非酶的亚硝酸镍检测

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摘要

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 mu M, with a detection limit of 0.07 mu M (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 %.
机译：通过简单的一步溶解的方法，在没有还原剂和碱的情况下，合成了一种有效的非贵金属Eletrocatyst，氢氧化镍氢氧化镍/氧化烯氧化物纳米复合材料（Ni（OH）（2）/ sr-Go）。 Ni（OH）（2）/ sR-Go纳米复合材料的形态，结构和组成的特征在于扫描电子显微镜，X射线衍射，拉曼光谱，X射线光电子谱和能量分散X等各种分析技术-Reir光谱。然后使用Ni（OH）（2）/ SR-GO纳米复合材料构建非酶的浓度传感器，用于高敏感的亚硝酸盐检测。结果表明，Ni（OH）（2）/ sR-GO纳米复合材料具有较高的亚硝酸盐的电催化能力。通过电化学阻抗光谱，刻录量和循环伏安法评估Ni（OH）（2）/ sR-Go的电化学性能。在最佳条件下，用于亚硝酸盐检测的电化学传感器显示出0.1至663.6μm的线性范围，检测限为0.07μm（s / n = 3）。此外，传感器提供了有利的选择性，再现性和稳定性，并且可以成功地应用于尖刺水样中的亚硝酸盐。回收率为95和108％。

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