新型Cu/Cu₂O/TiO₂电极检测糖含量的研究

Research of Using a New Type of Cu/Cu₂O/TiO₂ Electrode Detecting Saccharides Content

摘要: 本实验采用二次阳极氧化结合简单的电沉积方法制备新型Cu/Cu₂O/TiO₂(CCT)电极。我们通过扫描电镜(SEM)、X射线衍射仪(XRD)和电化学工作站对产物的形貌、晶相和电催化性能进行了表征，发现簇状大颗粒形貌的Cu/Cu₂O分散在TiO₂纳米管中。通过对比研究电极在0.1 M NaOH溶液条件下，分别对葡萄糖、果糖和蔗糖的电催化氧化结果。可以发现葡萄糖的催化氧化电流最高，而果糖的氧化电位最低，蔗糖的催化氧化性能最差。使用该电极能分别检测较低浓度的三种糖，其中对果糖检测性能最好，其线性响应范围为0~3.5 mM (R² = 0.99)，灵敏度为3560 µA cm⁻²•mM⁻¹，检测限(LOD)为1.3 µM。该电极对葡萄糖与果糖混合溶液的最高氧化电流密度可达8 mA cm⁻²，表现出了相当好的电催化氧化性能，未来有望在糖类燃料电池领域得到应用。

Abstract: Cu/Cu₂O/TiO₂ (CCT) nanotube arrays electrode has been fabricated by secondary anodic oxidation combination of electrodeposition method. The structure and morphology of the CCT were charac-terized by X-ray diffraction (XRD) and Scanning electron microscope (SEM) respectively and the electrochemical performances of the electrode were performed on electrochemical workstation. The SEM result showed that the large sized, cluster-liked Cu/Cu₂O particles have dispersed in CCT nanotubes. When the electrode was used as electrocatalytic oxidation of the glucose, fructose and sucrose under 0.1 M of NaOH aqueous solution, the tested results showed that the glucose has the highest oxidated current, the fructose has the lowest oxidated electric potential but the sucrose has the poorest electrocatalytic oxidation performance among these three saccharides. Moreover, when the electrode was utilized as detection for the low concentrations of saccharides, the electrode showed excellent detection performance for fructose. Its linear response could reach up to 3.5 mM (R² = 0.99) with detection limit of 1.3 μM (signal/noise = 3) and the sensitivity is 3560 µA cm⁻²•mM⁻¹. Meanwhile, the electrode showed outstanding electrocatalytic oxidation performance that the oxidation electric current could reach to 8 mA cm⁻² for the glucose and fructose mixed aqueous solution. The electrode had the potential application prospect and expected to be applied in carbohydrate fuel cells.