In this report, a CNFs-Sm₂O₃ nanocomposite modified glassy carbon electrode (CNFs-Sm₂O₃/GCE), comprising CNFs with a large specific surface area and Sm₂O₃ with excellent catalytic activity, is prepared as a novel sensor for simultaneously detecting hydroquinone (HQ) and catechol (CC) in an aqueous environment. The surface characteristics and electrochemical performance of the as-prepared sensor were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and electrochemical approaches. The electrochemical results show the well-defined redox peaks of HQ and CC, and the potential difference of the peak-to-peak separation between HQ and CC is about 111 mV, as determined by both cyclic voltammetric (CV) and differential pulse voltammetric (DPV) techniques, which indicate that the modified electrodes can simultaneously determine HQ and CC without any separation step. The current of the anodic peak response of the CNFs-Sm₂O₃/GCE displays a linear dependence on the concentration of HQ and CC in the range of 1–500 μM, and the detection limits for HQ and CC are 0.09 and 0.07 μM, respectively. Moreover, the CNF-Sm₂O₃/GCE possesses excellent selectivity, reproducibility and stability in determining the concentration of the isomers of dihydroxybenzene. Therefore, this new type of electrode is promising as a sensor for simultaneous determination of HQ and CC in an aqueous environment.

中文翻译：

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甲碳纳米纤维-SM ₂ ö ₃纳米复合物：用于同时检测二羟基苯的两种异构体的新颖的电化学平台†

在此报告中，一种CNFs-Sm ₂ O ₃纳米复合改性玻碳电极（CNFs-Sm ₂ O ₃ / GCE），包括具有大比表面积的CNF和Sm ₂ O ₃具有优异催化活性的新型传感器准备用于在水性环境中同时检测对苯二酚（HQ）和邻苯二酚（CC）。通过扫描电子显微镜（SEM），能量色散谱（EDS），X射线衍射（XRD）和电化学方法对所制备传感器的表面特性和电化学性能进行了表征。电化学结果表明，HQ和CC的氧化还原峰清晰可见，HQ和CC之间的峰峰分离电位差约为111 mV，这由循环伏安法（CV）和微分脉冲伏安法（ DPV）技术，这表明修饰的电极可以同时确定HQ和CC，而无需任何分离步骤。CNFs-Sm的阳极峰值响应电流₂ O ₃ / GCE对HQ和CC的浓度呈线性关系，范围为1–500μM，HQ和CC的检出限分别为0.09和0.07μM。此外，CNF-Sm ₂ O ₃ / GCE在确定二羟基苯异构体的浓度方面具有极好的选择性，可再现性和稳定性。因此，这种新型电极有望作为一种传感器，用于同时测定水性环境中的HQ和CC。