Electrode consisting of Pt nanoparticles deposited on thin films of niobium doped tin oxide (Pt/Nb-SnCh) was prepared onto titanium substrates by an electrodeposition method. The physical characterization of these electrodes (Pt/Ti and Pt/Nb-SnCb/Ti) was carried out by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The general aspects of the electrochemical behavior were studied by cyclic voltammetry and electrochemical impedance spectroscopy in 0.5 mol L"' H2SO4 aqueous solution. The response of these electrodes in relation to the oxidation of methanol and carbon monoxide absorbed on Pt active sites in acidic media was studied. By the use of cyclic voltammetry, the electrochemical surface area (ECSA) of a platinum electrocatalyst is measured by hydrogen adsorption. ECSA of Pt/Nb-SnCh/Ti electrode compared to Pt/Ti electrode was increased that caused this electrode exhibited the high activity for methanol electro-oxidation and CO stripping experiments.
