Preparation And Application Of Nano Platinum Composite Film-modified Electrodes

A platinum nanoparticles modified glassy carbon electrode was prepared by a one-step in situ chemical reduction growth method,on which the electrochemical responses of hydroquinone were studied; Through combining thiols with platinum, 3-mercaptopropionic acid was self-assembled on this modified electrode. By electrochemical impedance measurements, the modified electrodes surface was characterized using [Fe(CN)6]3-/[Fe(CN)6]4- redox probe. The electro-catalystic activity of the Self-assembled monolayers (SAMs) for o-aminophenol was investigated. By electrochemical synthesis of polymer films of catechol, resorcinol, HQ, OAP, and phosphomolybdate, and nano-platinum modified glassy carbon electrodes (PtNP/GCE) were prepared respectively. The electro-catalystic activity of the modified electrodes for methanol, ethanol, glycol and isopropanol was investigated.As the result, the main achievement are listed as follows:(1)Compared with bare glassy carbon, the PtNP/GCE was proved to have obviously electrocatalytic effect on hydroquinone;(2)The coverage density of platinum nanoparticles on surface of glassy carbon electrode was calculated as 5.548×10-10mol/cm2, The MPA/PtNP/GCE can improve the OAP's adsorption, The peak currents were found to be linear with OAP concentration from 3.0×10-5 to 1.0×10-3 mol/L by DPV. Common ions and organic compounds have no interference on the test of OAP;(3)Compared with on the PtNP/GCE, The electrocatalytic activity for methanol was improved efficiently on PtNP/HQ/GCE. Methanol's oxidation peaks currents were found to be linear with scan rate,and it shows that reagent can adsorb on the electrode's surface;(4)Preliminary tests showed that the PtNP/OAP/GCE featured the efficient electrocatalytic activity for alcohol,glycol and Isopropanol;( 5 ) PtNP/PMO12/GCE can minimize the catalytic poisoning effect of the intermediate product which was produded in the process of methanol oxidation on the nanotechnology platinum, and enhance the electrodes'stability and reproducibility.