Electrodeposited Platinum Nanoparticles on the Multi-Walled Carbon Nanotubes and its Electrocatalytic for Nitric Oxide

The present work describes a new approach to directly electrodeposit platinum nanoparticles on the surface of multi-walled carbon nanotubes (MWNTs) through cyclic potential scanning technique and to prepare a novel carbon nanotubes including platinum nanoparticles modified electrode (noted as Pt/MWNTs). TEM image shows that Pt nanoparticles are attached on the out surface of the MWNTs with average particle size about 20 nm. The electrochemical behaviors of Pt/MWNTs electrode are characterized by cyclic voltammetry (CV) and the CV curves demonstrate the several well-known current features that are the same as that of a Pt film nano-size electrode. At the Pt/MWNTs modified electrode, an obvious electrocatalytic reduction peak of nitric oxide (NO) can be observed, which is at about –0.42V (vs. Ag/AgCl) and the reduction peak current is proportional linearly to the NO concentration. The potential application of the Pt/MWNTs modified electrode as a NO sensor was also investigated in terms of its dose-response curve and stability.