聚卟啉修饰金电极及其催化氧还原反应

Poly[Cobalt(II) meso-Tetraphenylporphyrin] (pCoTPP) was deposited onto a gold electrode through electrochemical polymerization of Cobalt(II)meso-Tetraphenylporphyrin （CoTPP）and demonstrated higher electrocatalytic activity for the reduction of dioxygen in 0.5 mol/L H2SO4 solution. To investigate the mechanism of pCoTPP-modi?ed electrode for the oxygen reduction reaction (ORR) , Cyclic Voltammetry was employed. Compared with Gold electrode and free physical absorption CoTPP-modi?ed electrode, pCoTPP-modi?ed Gold disk electrode showed the best electrocatalytic activity for ORR. Research has shown that peak currents (Ipc) linearly vary with the square root of scan rate (v1/2), which is a typical diffusion-controlled electro-chemical event. The slope of potential versus pH is close to the theoretical value of 59 mV p/n. In this case, the number of protons and electrons is same. The modified electrode is stable in acidic solution that it is suitable for use for long time.