AbstractThe authors describe the synthesis, characterization and electrochemical sensing performance of a PrFeO3-MoS2 nanocomposite. Graphene-like MoS2 sheets and a perovskite-type PrFeO3 were synthesized via a hydrothermal and a sol-gel method, respectively. Finally, PrFeO3-MoS2 nansheets were synthesized by using sodium molybdate as a source for molybdenum and thiourea as the source for sulfur. The nansheets were characterized by transmission electron microscopy and X-ray diffraction. The electrochemical behavior of the nanosheets deposited on a glassy carbon electrode was studied via electrochemical impedance spectroscopy and cyclic voltammetry. The modified electrodes display strong response to nitrite. At a scan rate of 100 mV·s−1, the current at the oxidation peak at 0.85 V (vs. SCE) increases linearly in the 0.005 to 3 mM nitrite concentration range. The detection limit is 1.67 μmol·L−1 (S/N = 3). The sensor is selective, stable and reproducible. It was successfully applied to the determination of nitrite in (spiked) real samples, and appropriate recoveries were obtained. Graphical abstractPrFeO3-MoS2 nanocomposites were employed to fabricate an electrochemical sensor for nitrite. The sensor exhibits excellent electrochemical catalysis towards the oxidation of nitrite with good stability and reproducibility.

中文翻译：

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用于增强亚硝酸盐电氧化传感的 PrFeO3-MoS2 纳米片

摘要作者描述了 PrFeO3-MoS2 纳米复合材料的合成、表征和电化学传感性能。分别通过水热法和溶胶-凝胶法合成了类石墨烯 MoS2 片和钙钛矿型 PrFeO3。最后，通过使用钼酸钠作为钼的来源和硫脲作为硫的来源合成了 PrFeO3-MoS2 纳米片。通过透射电子显微镜和 X 射线衍射表征纳米片。通过电化学阻抗谱和循环伏安法研究了沉积在玻碳电极上的纳米片的电化学行为。修饰的电极对亚硝酸盐显示出强烈的响应。在 100 mV·s-1 的扫描速率下，0.85 V（vs. SCE）氧化峰处的电流在 0. 005 至 3 mM 亚硝酸盐浓度范围。检测限为 1.67 μmol·L−1 (S/N = 3)。该传感器具有选择性、稳定性和可重复性。它已成功应用于（加标）实际样品中亚硝酸盐的测定，并获得了适当的回收率。图形抽象 PrFeO3-MoS2 纳米复合材料被用来制造亚硝酸盐的电化学传感器。该传感器对亚硝酸盐的氧化表现出优异的电化学催化，具有良好的稳定性和重现性。