Mirceski, Valentin and Sebez, Bine and Jancovska, Maja and Ogorevc, Bozidar and Hocevarc, Samo (2013) Mechanisms and kinetics of electrode processes at bismuth and antimony film and bare glassy carbon surfaces under square-wave anodic stripping voltammetry conditions. Electrochimica Acta, 105. pp. 254-260. ISSN 00134686
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Abstract
Mechanism and kinetics of anodic stripping electrode processes of Zn(II), Cd(II) and Pb(II) at bismuth
(BiFE) and antimony (SbFE) film as well as bare glassy carbon (GCE) electrodes have been studied with
respect to our recent published theoretical considerations developed for square-wave voltammetry
(SWV). Mechanistic aspects of electrode reactions have been elucidated by a qualitative comparison
of simulated and experimental data for three different electrode reaction mechanisms, i.e. simple anodic
stripping mechanism, anodic stripping mechanism coupled with adsorption of metal analyte ions, and
mechanism affected by interactions within the particles of the metal deposit on the electrode surface.
The electrode kinetics has been estimated by the method of quasireversible maximum and by analyzing
the peak potential separation between forward and backward SW components, under variation of the
SW amplitude. Electrode mechanisms and kinetics are different at bismuth compared to antimony film
electrodes. The electrode reactions of Pb(II) and Cd(II) at BiFE involve adsorption phenomena, while electrode
processes of all three analytes are free of adsorption at SbFE. At BiFE, the electron transfer standard
rate constants of all three analytes are quite comparable, ranging within the interval from 1 to 3 cm s−1.
At SbFE the electrode kinetics of Cd(II) and Pb(II) are almost the same, while the electrode reaction of
Zn(II) is significantly slower. Our results showed that the kinetics of all examined electrode reactions are
slower at SbFE as compared to those observed at BiFE.
| Item Type: | Article |
|---|---|
| Subjects: | Natural sciences > Chemical sciences |
| Divisions: | Faculty of Medical Science |
| Depositing User: | Maja Cocevska |
| Date Deposited: | 16 May 2017 08:48 |
| Last Modified: | 16 May 2017 08:48 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/17784 |
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