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

Analysis of Anodic Linear Sweep Voltammograms Considering Insufficient Lability of Cu|Cu(II), Glycine System

“…In this case, significant acidification of the surface layer is expected. 38 Considering previously published data as well as the experimental results presented here, it seems reasonable to conclude that deprotonation of the glycine zwitterion is a process that reduces the lability of the Cu|Cu(II), glycine system under anodic LS-voltammetry conditions. Similar phenomena can be expected to occur in the case of other systems containing glycine homologs, 20,21,46 the kinetic characteristics of which do not differ significantly from those presented above.…”

“…As noted above, these plots can imitate stationary voltammograms, since the Δc M is proportional to the anodic current density. Experimental studies 25,33,37,38 confirm the presence of plateau-like limiting currents on RDE voltammograms. They occur as cathodic pre-waves in ligand-deficient systems or as anodic pseudo-limiting currents when there is an excess of ligand in solutions.…”

“…The electrochemical inertness of this ligand at 0 < E < 0.3 V was confirmed by EQCM experiments. 38 Free glycine can be irreversibly oxidized at the Cu electrode only above 1.2 V. 5 The above finding calls for an assessment of the lability of the system. The processes to be evaluated can be selected from the surface distribution of species (Fig.…”