NDLI: Cathodic processes in copper(II) solutions containing gluconic acid

Content Provider	Springer Nature Link
Author	Survila, A. Mockus, Z. Kanapeckaite, S. Pileckiene, J. Stalnionis, G.
Copyright Year	2011
Abstract	The kinetics of cathodic processes proceeding in the acidic 0.01 M Cu(II) solutions containing gluconic acid and 0.5 M Na$_{2}$SO$_{4}$ as the supporting electrolyte is studied. According to the spectrophotometric data, in the moderately acidic solutions, a monoligand complex of CuL$^{+}$ predominantly forms. Its concentration stability constant is 10$^{2.2}$ M$^{−1}$. In the cathodic voltammograms, a well-defined plateau of the limiting current is observed. The height of the plateau obeys the Levich equation. The effective diffusion coefficient decreases from 4.2 × 10$^{−6}$ to 2.5 × 10$^{−6}$ cm$^{2}$/s with increasing complexation degree of the system. An analysis of normalized Tafel plots showed that the exchange current density of Cu$^{2+}$ + e → Cu$^{+}$ process decreases with increasing concentration of ligand or with increasing pH value. Thereby, the cathodic chargetransfer coefficient remains constant (0.33 ± 0.02). A comparison of the kinetic data with the results of deposit surface examination points to significant surface activity of the ligand. The gluconate chemisorption can be accompanied by the incorporation of the fragments, which were formed as a result of its destruction, into the electrodeposits.
Starting Page	129
Ending Page	135
Page Count	7
File Format	PDF
ISSN	10231935
Journal	Russian Journal of Electrochemistry
Volume Number	47
Issue Number	2
e-ISSN	16083342
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-03-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	copper(II) gluconic acid complexes constant of stability kinetic parameters chemisorption electrodeposits Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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