钴酞菁修饰石墨电极检测微量过氧化氢的研究

Research on Detection of Trace Hydrogen Peroxide with Graphite Electrode Modified by Cobalt Phthalocyanine

采用电沉积法将四氨基钴酞菁(CoTAPc)修饰于石墨电极(GE)的表面得到GE-poly-CoTAPc修饰电极,用该电极对不同浓度H2O2溶液进行循环伏安和计时安培分析。结果表明,H2O2在GE-poly-CoTAPc电极上比在裸GE电极上的起始氧化电位明显负移了0.18V,峰电流Ip增加了150.5μA,GE-poly-CoTAPc电极可用作过氧化氢的响应电极。工作电压为1V时,计时安培法分析得出Ip与H2O2的浓度在19.48～194.8μM浓度范围内呈线性关系,检测下限为4.72μM。GE-poly-CoTAPc修饰电极在H2O2溶液中平行20次计时安培分析发现电极的检测下限仅下降了1.1%,表明修饰电极具有优良的稳定性。

This research obtains GE-poly-CoTAPe modified electrode by modifying the surface of graphite electrode（GE） with CoTAPc with electrodeposition method and uses this electrode to conduct cy- clic voltammetry and chronoamperometry on H2O2 solutions with different concentrations. The result shows that the initial oxidation potential of H2O2 on GE-poly-CoTAPc electrode moves by 0.18 V nega- tively than that on bare GE electrode; peak current Ip increases by 150. 5 μA; GE-poly-CoTAPc electrode can be used as the response electrode of hydrogen peroxide. When the working voltage is 1 V, chrono- amperometry obtains that concentrations of Ip and H202 show a linear relation within the concentration range 19.48～194.8 μM and the lower limit of detection is 4.72 μM.20 times of chronoamperometry on GE-poly-CoTAPc modified electrode in H2 02 solution find that the lower limit of detection of the electrode only decreases by 1.1G, indicating that the modified electrode has a good stability.