Contribution to the Study of Ir Electrodes in Aqueous Solution of KNO3/HNO3 and KNO3/HNO3/Hg2(NO3)2

• Autor(a) principal: Milaré,E.
• Data de Publicação: 2003
• Outros Autores: Ionashiro,E. Y., Benedetti,A. V., Fertonani,F. L.
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042003000200004
• topic: iridium; mercury; cyclic voltammetry; UPD

Cyclic voltammetry and surface analysis techniques (EDX microanalysis, mapping of elements and SEM images) have been used to study the solid state reactions of Ir in blank solution or Hg(I)-containing solution. The studies in KNO3/HNO3 solution permit to suggest the formation of a thin oxide layer film deposited in the substrate. The RCV process exhibits the decrease of capacitive current associated to the substrate surface restructuring. The electro deposition of Hg occurs initially in UPD condition from Hg(I)-containing solution, C Hg(I) = 3.51x10-7 mol L-1. The electro deposition of bulk mercury occurs from Hg(I)-containing solution, C Hg(I) = 3.51x10-5 mol L-1. It was observed the deposition of Hg in the substrate in open circuit for all employed conditions.