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The surface area of Ti/TiO2-Pt electrodes (ASr) in contact with 0.010 M HClO4 solutions was determined by Cyclic Voltammetry (CV) and Atomic Force Microscopy (AFM) techniques. The Ti/Pt/TiO2 electrodes with different amounts of electrodeposited Pt (1, 5 and 10 seconds) were polarized up to 1.5 V vs. Ag/AgCl (sat. KCl) and stabilized at the final potential during 15 minutes. The highest limit of oxygen adsorption and/or oxide formation was choosen for potentials before the oxygen evolution, and the current corresponding to the region were the oxygen desorption takes place was integrated. These values were used as a parameter to determine the ASr for the different electrodes. The results demonstrate that the Ti/Pt/TiO2 (10 seconds) electrodes have the largest area in contact with the electrolyte. A second method used to determine the ASr was AFM. The results obtained by the two methods were in good correlation.

Determinación del área de superficie real de electrodos de titanio modificado con platino por voltamperometría cíclica