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Periodic Transition between Breathing Spots and Synchronous Sulfur Deposition/Dissolution in Transpassive Region of the Electro‐Oxidation of Sulfide on Platinum
Author(s) -
Pan Changwei,
Cheng Ruolan,
Birzu Adrian,
Yang Jiaping,
Ren Lin,
Varela Hamilton,
Gao Qingyu
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700279
Subject(s) - platinum , deposition (geology) , dissolution , amplitude , sulfide , chemistry , materials science , analytical chemistry (journal) , metallurgy , optics , catalysis , physics , geology , paleontology , biochemistry , chromatography , sediment
In the transpassive region of sulfide electro‐oxidation on platinum, the system displayed different complex oscillations under potentiostatic control experiments, changing from quasiperiodic small oscillations to alternate modes between small and large amplitude oscillations for increasing applied voltages. In each period of the alternating‐mode oscillations, the current density evolves from a slightly decreasing steady state to small and large amplitude oscillations. Spatiotemporal patterns developed on the platinum disk were recorded with a CCD camera and ranged from breathing spots to alternating patterns between breathing spots and synchronous deposition/dissolution. Karhunen‐Loève decomposition analysis of the experimental patterns showed that the twinkling patterns had multiple modes each with a low percentage of energy, whereas the alternate patterns were mainly characterized by one dominant mode.