In this work, the framework of Co nanoparticles and nitrogen-doped carbon nanotubes (Co/NCNTs) derived from metal–organic frameworks (MOFs) through solid pyrolysis was successfully synthesized in the atmosphere of H2 and Ar gases. The Co/NCNTs composites exhibited superior electrocatalytic performance for tert-butyl hydroquinone (TBHQ) oxidation due to the synergistic effect between chemical composition and the specific structure of Co nanoparticles and nitrogen-doped carbon nanotubes. It was found that the reaction underwent a quasi-reversible redox reaction with 37-fold higher anodic current for TBHQ at Co/NCNT-modified electrode when compared to bare glassy carbon electrode (GCE). In optimal condition, Co/NCNTs/GCE exhibited a linear range of 0.05–80.00 μmol·L−1 for detecting TBHQ, and the limit of detection (LOD) was estimated to be as low as 10 nmol·L−1 (signal/noise of S/N = 3). Moreover, the as-obtained modified electrode was successfully used to assay the content of TBHQ in edible oil samples.

中文翻译：

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金属有机骨架（ZIF-67）衍生的Co纳米颗粒/N掺杂碳纳米管复合材料用于电化学检测叔丁基对苯二酚

在这项工作中，在 H2 和 Ar 气体气氛中，通过固体热解从金属有机骨架 (MOF) 衍生出的 Co 纳米颗粒和掺氮碳纳米管 (Co/NCNT) 的骨架成功合成。由于化学成分与 Co 纳米颗粒和氮掺杂碳纳米管的特定结构之间的协同作用，Co/NCNTs 复合材料对叔丁基对苯二酚 (TBHQ) 氧化表现出优异的电催化性能。发现与裸玻碳电极 (GCE) 相比，该反应在 Co/NCNT 修饰的电极上进行了准可逆氧化还原反应，TBHQ 的阳极电流高出 37 倍。在最佳条件下，Co/NCNTs/GCE 检测 TBHQ 的线性范围为 0.05–80.00 μmol·L-1，检测限 (LOD) 估计低至 10 nmol·L-1（S/N 的信号/噪声 = 3）。此外，所获得的修饰电极成功地用于测定食用油样品中 TBHQ 的含量。