Cathodic Behavior of Bismuth. I. Ellipsometric Study of the Electroreduction of Thin Bi2O3 Films".

M. A. PÉREZ AND M. LÓPEZ TEIJELO.

JOURNAL OF ELECTROANALYTICAL CHEMISTRY

Año: 2005 vol. 583 p. 212 - 212

0022-0728

font face="AdvPSTim" size="1"> The electroreduction of thin Bi2O3 films was characterized by employing electrochemical techniques and in situ ellipsometry. Theelectroreduction optical response is described in terms of a bilayer model. The optical analysis indicates that electroreductionproceeds yielding a rough/porous layer of metallic bismuth at the oxide/electrolyte interface, that grows inwards at the expenseof the underneath oxide layer to completely exhaust it. At the end of oxide electroreduction, the aging process of the porous metallicbismuth layer could be detected. On this framework, changes in the oxide growth kinetics observed on electroreduced surfaces canbe consistently explained.