PREPARATION, CHARACTERIZATION AND ELECTROCHEMICAL STABILITY EVALUATION OF Ti/Co3O4-xIrO2 ELECTRODES

• Autores: Valenzuela Barrientos, Wilner, La Rosa-Toro Gómez, Adolfo
• Formato: artículo
• Fecha de Publicación: 2015
• Institución: Sociedad Química del Perú
• Repositorio: Revista de la Sociedad Química del Perú
• Lenguaje: español
• OAI Identifier: oai:rsqp.revistas.sqperu.org.pe:article/25
• Enlace del recurso: http://revistas.sqperu.org.pe/index.php/revistasqperu/article/view/25
• Nivel de acceso: acceso abierto
• Materia: Spinel electrodes; spinel doped iridium oxide; electrochemical stability test; Electrodos de espinela; espinela de cobalto dopado de iridio; evaluación de la estabilidad electroquímica

Cobalt spinel is a good material for the manufacture of electrodes for the electrochemicaloxidation of azo dyes; however, it has poor electrochemical stability in electrolytes withchlorides ion, suffering severe corrosion. This work focuses on the preparation and evaluationof spinel cobalt electrode doped with iridium oxide supported on titanium foil, Ti/Co3O4-xIrO2 and their evaluation as stable to corrosion by chloride electrodes. The influence ofIrO2 into cobalt spinel electrode was evaluate, the spinel was doped with 1,25%; 2,5% and5,0% (atomic percent) iridium. The electrodes were characterized using cyclic voltammetrytechniques (VC), scanning electron microscopy (SEM), energy dispersive microanalysis(EDX) and X-ray diffraction (XRD). The test of the stability of the electrodes was subjectedto electrolysis in a solution of sodium chloride to 6% (w/v), at room temperature, maintainingpH 5,8 and a current of 0,5A.cm-2. The results showed that the electrodes increased theirelectrochemical stability relative to IrO2 increased content of cobalt in the spinel.