Anodic processes in the alkaline Cu | Cu(II), glycine system—construction and analysis of mass transport–corrected Tafel plots

The anodic behavior of the alkaline Cu | Cu(II), glycine system was investigated by RDE voltammetry combined with EQCM measurements. Well-defined current plateaus were observed on RDE voltammograms in the presence of the excess of ligand. Surface distribution of complexes and ligands in this region...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2023-07, Vol.27 (7), p.1813-1820
Main Authors: Survila, Arvydas, Kanapeckaitė, Stasė, Staišiūnas, Laurynas
Format: Article
Language:English
Subjects:
Analytical Chemistry
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Copper
Electrochemistry
Empirical analysis
Energy Storage
Glycine
Ligands
Mass transfer
Mass transport
Original Paper
Physical Chemistry
Transport phenomena
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Summary:The anodic behavior of the alkaline Cu | Cu(II), glycine system was investigated by RDE voltammetry combined with EQCM measurements. Well-defined current plateaus were observed on RDE voltammograms in the presence of the excess of ligand. Surface distribution of complexes and ligands in this region was analyzed within the framework of the mass transfer model considering the chemical interactions between species. The degree of surface complexation changes dramatically in the region of pseudo-limiting current due to a sharp decrease in the surface pH and formation of protonated ligands. Entire RDE voltammograms, corrected for mass transport phenomena, were transformed into linear Tafel plots using normalization of the anodic current density relative to the surface concentration of the deprotonated ligand. Empirical Tafel constants were used for estimation of anodic kinetic parameters supposing that the first stage of copper ionization involves the formation of a monoligand copper-glycinate complex.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-022-05365-x