Abstract
The oxygen (OER) and chlorine (CLER) evolution reactions were used as probes to test the electronic properties of modified electrodes (Ti/TiO2-Pt). Both reactions were studied in acidic solutions by means of current-potential (j-E) and impedance measurements under steady state conditions. The effect of dopant concentration, TiO2 thickness, and the concentration of the electroactive species in the solution was analyzed. A diminution of the electron transfer current with titanium oxide thickness was obtained whereas an increase of the current was found on augmenting Pt amount. At low titanium oxide thickness both inner-sphere reactions behave in the same way as in the case of pure Pt, indicating that platinum sites are the active ones. However, at higher titanium oxide thickness, the platinum sites become less active and the valve metal oxide (TiO2) begins to block OER and CLER reactions. The electrochemical impedance spectroscopy results are compared with those of the current-potential measurements and a good correlation is found between them.
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