 ISSN 0235-7216 ISSN 2424-4538 (online) |
2008 m. Nr. 1 Effect of the nature of supporting electrolyte on the electroreduction kinetics of Cu(II)–glycine complexes
in slightly alkaline medium
Voltammetry and electrochemical impedance spectroscopy were used to investigate the effect of the nature of a supporting electrolyte (lithium, sodium, potassium and caesium sulphates) on the electroreduction kinetics of Cu(II)–glycine complexes at pH 8.3. An analysis of normalized Tafel plots shows that voltammograms may be treated quantitatively provided that a mono-ligand complex CuL+ (L– is the anion of glycine) is the electrically active complex taking part in the consecutive transfer of two electrons. With an increase in the radius of the alkaline metal ion there is a rise in the cathodic charge transfer coefficient accompanied by a fall in the exchange current density. Surface oxides may be formed in the system and the most pronounced effect of the surface oxidation is observed in solutions containing K2SO4. Keywords: copper, glycine, complexes, electroreduction, cuprous oxide, voltammetry, impe-dance spectroscopy |
Issues:
2017 - Vol.28 No. 1, No. 2, No. 3, No. 4 2016 - Vol.27 No. 1, No. 2, No. 3, No. 4 2015 - Vol.26 No. 1, No. 2, No. 3, No. 4 2014 - Vol.25 No. 1, No. 2, No. 3, No. 4 2013 - Vol.24 No. 1, No. 2, No. 3, No. 4 2012 - Vol.23 No. 1, No. 2, No. 3, No. 4 2011 - Vol.22 No. 1, No. 2, No. 3, No. 4 2010 - Vol.21 No. 1, No. 2-4 2009 - Vol.20 No. 1, No. 2, No. 3, No. 4 2008 - Vol.19 No. 1, No. 2, No. 3-4 2007 - Vol.18 No. 1, No. 2, No. 3, No. 4 2006 - Vol.17 No. 1, No. 2-3, No. 4 2005 - Vol.16 No. 1, No. 2, No. 3-4 2004 - Vol.15 No. 1, No. 2, No. 3, No. 4 2003 - Vol.14 No. 1, No. 2, No. 3, No. 4 2002 - Vol.13 No. 1, No. 2, No. 3, No. 4 2001 - Vol.12 No. 1, No. 2, No. 3, No. 4 |