Skip to content. | Skip to navigation

Laboratoire d’Etudes en Géophysique et Océanographie Spatiales

Personal tools

This is SunRain Plone Theme


You are here: Home / Research teams / Research / SYSCO2 / _Abstracts / Jonca_2012b


by Webmaster Legos last modified Feb 11, 2013 11:07 AM

Electrochemical Behaviour of Isopoly- and Heteropolyoxomolybdates Formed During Anodic Oxidation of Molybdenum in Seawater

Justyna Jońca, Carole Barus, William Giraud, Danièle Thouron, Véronique Garçon, Maurice Comtat
Int. J. Electrochem. Sci., 7 (2012) 7325 - 7348.


The electrochemical behaviour of isopoly- and heteropolyoxomolybdates formed during anodic oxidation of molybdenum in seawater at constant current intensity was investigated in this work. The results supported by spectrophotometry clearly indicate the formation of mixed valence molybdates (V/VI) during this process. The electrochemical behaviour of isopolyoxomolybdates shows a typical quasi-reversible mass-transport limited system coupled with an adsorption of reduced species and under some kinetic limitations. For heteropolyoxomolybdates a reversible mass-transport limited system coupled with an homogeneous chemical reaction was found. The coupled reaction, probably protonation, prevents a rapid heterogeneous electron transfer for heteropolyoxomolybdate complex. The phenomenon is more noticeable for the phosphomolybdate complex since the protonation step has a greater influence on the registered voltammograms. The presented results have a great importance in research areas where molybdate chemistry is used in detection of silicate and phosphate, namely in seawater.


→ Retour à la liste des publications



Document Actions