Abstract This study reports the synthesis of the BiVO4/TiO2 nanocomposite in optimized conditions using the hydrothermal route. By varying many experimental parameters such as the temperature, the hydrothermal reaction time, the pH of the solution and the surfactant’s nature, we have successfully obtained BiVO4 (monoclinic)/TiO2 (anatase) nanomaterials with different morphologies. These materials were characterized by X-ray powder Diffraction (XRD), Infrared Spectroscopy (IR) and Scanning Electron Microscopy (SEM). The as-prepared nanocomposites were employed to manufacture hybrid electrode sensors to detect H2O2. The BiVO4/TiO2 nanocomposite was deposited on nickel foam which acts as the working electrode. The response to hydrogen peroxide on the formed electrode was examined using cyclic voltammetry and amperometry techniques. Due to the synergic effect and the nanometric character of the BiVO4/TiO2 nanocomposite, the synthesized sensor shows an enhanced electrochemical sensing performance. Under optimal conditions, the H2O2 sensing tests indicate that the as-prepared BiVO4/TiO2 electrochemical sensor exhibits a low detection limit (5 μM), a high sensitivity (3014 μA/mM), which is two times larger than that of BiVO4 and TiO2, a large linear range (5–400 μM), and long-term stability. Finally, the practical applications of the BiVO4/TiO2 electrochemical sensor were also evaluated by analyzing H2O2 in the presence of common interfering species such as uric acid, ascorbic acid, vitamin-B12, glycine, asparagine, glucose, urea, KNO3, NaNO3 and NaCl. The as-obtained results confirm the high selectivity towards H2O2 of the BiVO4/TiO2 electrode. These results could open the route for potential applications of the BiVO4/TiO2-based sensor in many fields such as: biomedicine, environmental detection, electrochemical sensing and pharmaceutical analysis.

中文翻译：

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BiVO4/TiO2纳米复合材料：过氧化氢电化学传感器

摘要 本研究报告了使用水热法在优化条件下合成 BiVO4/TiO2 纳米复合材料。通过改变温度、水热反应时间、溶液的pH值和表面活性剂的性质等许多实验参数，我们成功地获得了不同形态的BiVO4（单斜晶）/TiO2（锐钛矿）纳米材料。这些材料通过 X 射线粉末衍射 (XRD)、红外光谱 (IR) 和扫描电子显微镜 (SEM) 进行表征。所制备的纳米复合材料用于制造混合电极传感器以检测 H2O2。BiVO4/TiO2 纳米复合材料沉积在作为工作电极的泡沫镍上。使用循环伏安法和电流法技术检查对形成的电极上的过氧化氢的响应。由于 BiVO4/TiO2 纳米复合材料的协同效应和纳米特性，合成的传感器显示出增强的电化学传感性能。在最佳条件下，H2O2 传感测试表明所制备的 BiVO4/TiO2 电化学传感器具有低检测限（5 μM）和高灵敏度（3014 μA/mM），是 BiVO4 和 TiO2 的两倍, 大线性范围 (5–400 μM) 和长期稳定性。最后，还通过在常见干扰物质如尿酸、抗坏血酸、维生素 B12、甘氨酸、天冬酰胺、葡萄糖、尿素、KNO3、NaNO3 和 NaCl 存在下分析 H2O2 来评估 BiVO4/TiO2 电化学传感器的实际应用. 所获得的结果证实了 BiVO4/TiO2 电极对 H2O2 的高选择性。