Current oscillation behavior of the O-2/O-2(-) redox couple at a HMDE in non-aqueous aprotic media

Citation
Ms. Saha et al., Current oscillation behavior of the O-2/O-2(-) redox couple at a HMDE in non-aqueous aprotic media, J ELEC CHEM, 496(1-2), 2001, pp. 61-68
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
ISSN journal
1572-6657 → ACNP
Volume
496
Issue
1-2
Year of publication
2001
Pages
61 - 68
Database
ISI
SICI code
Abstract
Electrochemical oscillatory phenomena have been observed in the redox react ion of the O-2/O-2(-) (superoxide ion) couple on a hanging mercury drop ele ctrode (HMDE) in a limited aprotic medium. The current oscillation occurs d uring the reoxidation process of the electrogenerated O-2(-). It has been f ound that the observed oscillation is really irregular, complicated and aff ected by the addition of poly(vinyl chloride) as a maximum suppressor as we ll as many other experimental factors such as solvent, electrode substrate, concentration of O-2(-) in the electrode vicinity and potential scan rate in cyclic voltammetry. The oscillation phenomena have been explained simila rly to the maxima in classical polarography (i.e. by streaming phenomena) a nd in addition, based on the formation-destruction of a passive film on the electrode surface which results in the dissolution of the mercury electrod e. The results obtained demonstrate that the electrogeneration and adsorpti on of O-2(-) on HMDE are indispensable for the present oscillation. (C) 200 1 Elsevier Science B.V. All rights reserved.