kambire, ollo université félix houphouët-boigny de cocody - laboratoire de chimie physique, ufr ssmt, Côte d’Ivoire , appia, foffié thiery auguste université félix houphouët-boigny de cocody - laboratoire de chimie physique, ufr ssmt, Côte d’Ivoire , ouattara, lassiné université félix houphouët-boigny de cocody - laboratoire de chimie physique, ufr ssmt, Côte d’Ivoire

OXYGEN AND CHLORINE EVOLUTION ON RUTHENIUM DIOXIDE MODIFIED BY PLATINUM IN ACID SOLUTIONS

31532

RuO2 and 50RuO2-50Pt electrodes have been prepared thermally at 400°C on titanium substrate. The electrochemical measurements made in HClO4, ferri/ferrocyanide and HClO4 containing NaCl have shown that the surface of 50Pt-50RuO2 was composed by ruthenium dioxide and platinum active sites. The electrochemical investigation with ferri/ferrocyanide redox couple showed that RuO2 and 50RuO2-50Pt electrodes have almost the same electric conductivity. The Tafel slopes obtained on RuO2 and 50RuO2-50Pt for the chlorine evolution reaction (CER) were respectively 40 and 31 mV/dec in acid electrolyte indicating that the kinetic of CER was rapid on 50RuO2-50Pt than RuO2 owing to a synergetic effect of RuO2 and Pt. That additional effect of the surface component in 50RuO2-50Pt electrode let them possess high electrocatalytic activity towards CER than RuO2 in chlorides containing perchloric acid electrolyte. The gap between the onset of the CER and the onset of the OER on 50RuO2-50Pt is higher than that of pure ruthenium oxide. Combining Pt and RuO2 allows a clear separation between O2 and Cl2 evolvement on 50RuO2-50Pt electrode.

21

ruthenium dioxide , platinum , Tafel slope , voltammetry , electrocatalytic activity , chlorine evolution reaction , oxygen evolution reaction

Revue Ivoirienne des Sciences et Technologie

33