Kinetic study of silver (I) oxide layer electroreduction

• Autores: Gómez Becerra, J.; Salvarezza, Roberto Carlos; Arvia, Alejandro Jorge
• Año de publicación: 1990
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Química; Ciencias Exactas; Potentiostatic electroreduction; Scanning electron microscopy; UPD voltammetry; Silver
• Institución: Universidad Nacional de La Plata

The potentiostatic electroreduction of silver(I) oxide layer has been investigated in 0.1 M NaOH. The study was complemented by electroreduced silver surface characterisation through scanning electron microscopy micrographs and thallium UPD voltammetry. By properly adjusting the electroreduction conditions three well-defined processes could be distinguished: (i) the electroreduction of the Ag2O monolayer in direct contact with the silver substrate which involves a current decay following a first order law; (ii) the electroreduction of the primary Ag2O layer which can be described through an instantaneous nucleation and 3-D growth mechanism under diffusion control; (iii) the electroreduction of the secondary Ag2O layer involving a nucleation and 3-D conical growth under charge transfer control and a correction term for the death of growing nuclei. SEM and thallium UPD results correlate, in principle, with the conclusions derived from the electrochemical data.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas