铜修饰多孔镍自支撑电极的构建及其葡萄糖氧化性能

采用水热合成法制备了正八面体Cu₂O/Cu修饰的多孔Ni(NF)自支撑电极(Cu₂O/Cu-NF),并对其进行了形貌和结构表征。 在三电极体系下,在碱性介质中以循环伏安法和恒电位安培法测试其对葡萄糖催化氧化性能。 结果表明,150 ℃水热法制备的自支撑电极对葡萄糖的电催化氧化活性最强。 响应电流与葡萄糖浓度在3.7×10^-3~1.1 mmol/L和1.4~5.0 mmol/L范围内呈线性相关,响应灵敏度分别是6929和706.1 μA/(mmol·L^-1·cm²),且具有良好的选择性和稳定性,对无酶葡萄糖传感器的发展有重要意义。

Synthesis of Copper Modified Porous Nickel Self-supported Electrode and Its Catalytic Oxidation of Glucose

Porous Ni(nickel foam, NF) self-supported electrodes modified by Cu₂O/Cu were fabricated by hydrothermal method. Their morphology and structure were characterized by X-ray diffraction(XRD) and field-emission scanning electron microscopy(FESEM). The resulted surface of porous Ni is completely covered with octahedral Cu₂O/Cu composites of different sizes. The maximum diameter of the octahedron is about 5 μm. The glucose catalytic oxidation activity of Cu₂O/Cu-NF was measured by cyclic voltammetry and constant potential amperometric method in alkaline medium with three-electrode system. The results show that the Cu₂O/Cu-NF fabricated at 150 ℃ has the strongest electrocatalytic activity. The linear relationship of response current and glucose concentration could be observed clearly in the range of 3.7×10^-3~1.1 mmol/L and 1.4~5.0 mmol/L, with sensitivity of 6929 μA/(mmol·L^-1·cm²) and 706.1 μA/(mmol·L^-1·cm²), respectively. Satisfyingly, the Cu₂O/Cu-NF electrode is successfully employed to eliminate the interferences from uric acid(UA), acid ascorbic(AA) and L-proline(L-P) during the catalytic oxidation of glucose. The response current of Cu₂O/Cu-NF electrode for glucose electrocatalytic oxidation could reach 91.6% of the original current after one month. The Cu₂O/Cu-NF electrode allows highly sensitive, excellently selective, stable, and fast amperometric sensing of glucose and thus is promising for the future development of nonenzymatic glucose sensors.