2018-Sustainable Industrial Processing Summit
SIPS2018 Volume 2. Amatore Intl. Symp. / on Electrochemistry for Sustainable Development
| Editors: | F. Kongoli, H. Inufasa, M. G. Boutelle , R. Compton, J.-M. Dubois, F. Murad |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2018 |
| Pages: | 216 pages |
| ISBN: | 978-1-987820-84-3 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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The Nature of Current Peaks Observed in Electrochemical Systems Involving Metal Complexes: Properties and Diagnostics
Arvydas Survila1;1CENTER FOR PHYSICAL SCIENCES AND TECHNOLOGY, Vilnius, Lithuania;
Type of Paper: Regular
Id Paper: 197
Topic: 47
Abstract:
Investigations of electrochemical processes involving metal complexes show [1] that, simultaneously with the formation of metal coatings, other side processes can occur on the electrode surface, such as hydrogen evolution or the reduction of semiconductor compounds. Under linear potential sweep (LPS) conditions, all of them can be manifested as current peaks. Various factors can be used for their diagnostics: pH, potential sweep rate, electrochemical quartz crystal microgravimetry (EQCM) data, duration of the system pre-exposure under open-circuit conditions, optical excitation by quanta of different energies, etc. A comparison of the LPS voltammetry and EQCM data can be carried out using time-depending charges q(t) or current densities i(t). The procedures used include integrating the experimental voltammograms or differentiating the EQCM transients. The latter quantities coincide with voltammetric i(t) in the case of metal deposition, show no peak at hydrogen evolution and pass the minumum when surface oxides are reduced. Close inspection of the properties of the experimental peaks shows that these criteria can be successfully used for diagnostics of peak currents based on the indications presented.