碳纳米管/铁氰化镍/聚苯胺杂化膜对抗坏血酸的电催化氧化

Electrocatalytic oxidation of ascorbic acid on carbon nanotube/cubic nickel cyanoferrate/polyaniline hybrid films

采用循环伏安一步共聚法在碳纳米管修饰的铂基体上制备了立方体的铁氰化镍/聚苯胺/碳纳米管杂化膜;采用循环伏安法和计时电流法测试了杂化膜对抗坏血酸的电催化氧化性能;通过扫描电子显微镜(SEM)观察了杂化膜电极的表观形貌。结果表明,该电极对抗坏血酸具有较高的电催化氧化活性;在0.1 mol/L PBS和0.1 mol/L KNO3的溶液中,该杂化膜电极对抗坏血酸的催化氧化电流与其浓度在1×10-5～1.4×10-4mol/L呈良好的线性关系,相关性系数R=0.996 6,检出限为6.09×10-6mol/L,同时具有较高的灵敏度754.8 mA.M-1.cm-2,并采用计时电流法对抗坏血酸催化氧化的扩散系数和催化速率常数进行了研究。

Carbon nanotube/cubic nickel cyanoferrate/polyaniline hybrid films were synthesized by cyclic voltammetric electrodeposition of NiSO4, K3Fe（CN） 6 and aniline in a H2SO4/Na2SO4 solution on a platinum electrode coated with carbon nanotubes. The electrocatalytic oxidation performance for ascorbic acid （AA） using the hybrid film as an electrode was investigated by cyclic voltammetry and chronoamperometry. The morphology of the film was investigated by scanning electron microscopy. The hybrid film was used for AA detection, and showed a high electrocatalytic activity, a high sensitivity and a low detection limit. The linear range for the detection of AA was from 1 × 10-5 to 1.4 × 10-4 mol/L with a correlation coefficient of 0. 996 6, a sensitivity of 654 mA · M-1 · cm-2 and a detection limit of 6.09×10-6 mol/L. The diffusion coefficient and the catalytic rate constant of the electrocatalytic oxidation of AA were studied by chronoamperometry.