Designing a proper architecture of supporting electrode materials is the most promising strategy for improving the catalytic activity and chemical stability of electrochemical sensors. Herein, we have successfully synthesized 3D hierarchical flower-like cerium vanadate (CeVO₄) nanostructures by a simple hydrothermal approach. A sequence of scanning electron microscopy and spectroscopic techniques is used to clearly confirm the successful construction of CeVO₄ nanostructures. The electrocatalytic activity of these CeVO₄ modified electrodes for the electrochemical detection of clioquinol (CQ) was evaluated by cyclic voltammetry and differential pulse voltammetry methods. Benefiting from its unique 3D flower-like nanostructure, both of charge transfer rate and electronic conductivity were significantly improved, resulting in a significant enhancement in the electrochemical performance along with a wide dynamic linear range 0.02–215 μM, an ultralow detection limit (0.004 μM), a low oxidation peak potential (+0.47 V), and high selectivity in the presence of potentially interfering compounds. Interestingly, the CeVO₄ modified electrode was able to show excellent recovery range for the real sample analysis and could cheer up a commercial sensor, making it a potential sensing option to be applied in marketable electrochemical devices.

中文翻译：

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表面工程三维花状钒酸铈纳米结构用作电催化剂：生物样品中的喹喔啉的实时监测

设计合适的支撑电极材料结构是提高电化学传感器催化活性和化学稳定性的最有前途的策略。在这里，我们已经通过简单的水热方法成功地合成了3D分层的花状钒酸铈（CeVO ₄）纳米结构。一系列的扫描电子显微镜和光谱技术被用来清楚地确认CeVO ₄纳米结构的成功构建。这些CeVO ₄的电催化活性通过循环伏安法和差分脉冲伏安法评估了用于电化学检测氯喹醇（CQ）的修饰电极。得益于其独特的3D花状纳米结构，电荷转移速率和电子电导率均得到显着改善，电化学性能得到显着提高，动态线性范围宽至0.02–215μM，超低检测限（0.004μM ），低氧化峰电势（+0.47 V）和在存在潜在干扰化合物的情况下的高选择性。有趣的是，CeVO ₄ 修饰的电极能够在实际样品分析中显示出出色的回收率，并且可以使商业化的传感器振作起来，使其成为可用于市售电化学设备的潜在传感选择。