Electrochemical characterization of Ruthenium oxide on carbon paste electrodes in acid systems
Journal Title: Carbon - Science and Technology - Year 2009, Vol 2, Issue 3
Abstract
A comparative study of the electrochemical behavior of ruthenium in the electrolytic system 10-2 M RuCl3 / 1 M HClO4 at pH=1 was carried out using carbon paste electrodes prepared with carbon black (nanostructurated). Measurements of absorbance in the region of visible spectrum showed that the electroactive species is an oxy aquocomplex [RuO(H2O)4]2+. Studies of cyclic voltammetry of reversed potentials (Eλ) allowed for the description of the oxidation processes involved. The oxidation process explained the electrochemical formation of a ruthenium oxide (RuO4) which appeared with a defined potential value. This permitted its electrochemical growth on the paste electrodes. Capacitive behavior of this oxide in the system 1 M HClO4 was also characterized and its specific capacitance (F/g) was evaluated applying a current pulse. The obtained specific capacitance is of 120 Fg-1.
Authors and Affiliations
O. M. Alvarez, M. M. Hernandez
Keywords
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