甲苯胺蓝自组装的N,P,S共掺杂多孔碳电催化氧化NADH

Nitrogen,phosphorus and sulfur co-doped porous carbons self-assembled with toluidine blue O for electrocatalytic oxidation of NADH

氧化还原介质甲苯胺蓝(TBO)自组装到N,P,S共掺杂多孔碳(N,P,S@PC)表面,制备了一种新的电化学复合物(N,P,S@PC-TBO)。N,P,S@PC和N,P,S@PC-TBO复合物通过扫描电镜进行表征,两者表面形貌有明显的不同。N,P,S@PC-TBO复合物用来修饰玻碳(GC)电极,具有很高的导电性能。通过循环伏安和安培实验表征N,P,S@PC-TBO/GC电极的电催化行为。实验结果表明,N,P,S@PC-TBO/GC电极具有N,P,S@PC和TBO两者电催化氧化NADH的协同效应。N,P,S@PC-TBO/GC电极检测NADH的线性范围为1×10^(-6)-2×10^(-3)mol/L,检测限为3×10^(-7)mol/L (信/噪=3),响应时间为2 s。因此,制备的N,P,S@PC-TBO/GC电极为NADH的检测提供了较好平台。

A new electrochemical composite is reported, which is based on redox mediator toluidine blue O (TBO) self-assembled onto the surface of nitrogen, phosphorus and sulfur co-doped porous carbons (N, P, S@PC). The N, P, S@PC and N, P, S@PC-TBO composites were characterized by scanning electron microscopy and the results showed surface morphology of the two composites was distinctly different. The N, P, S@PC-TBO composite was used to modify glass carbon (GC) electrode which displayed high conductivity. The electrocatalytic behaviour of N, P, S@PC-TBO/GC electrode was studied by voltammetry and amperometry. The results demonstrated that the N, P, S@PC-TBO/GC electrode provided a positively synergistic effect between N, P, S@PC and TBO on the electrocatalytic oxidation of NADH. This modified electrode exhibited a wide linear range from 1×10^-6 - 2×10^-3 mol/L and a detection limit of 3×10^-7 mol/L ( S / N = 3) with a fast response time of 2 s, at a low applied potential of-0.203 V. Therefore, the N, P, S@PC-TBO/GC electrode provides a new platform for the detection of NADH.