The electroreduction kinetics of silver sulfite complexes |
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Authors: | Gintaras Baltrūnas,Au&scaron ra Valiūnien?,Gintar? Viselgien? |
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Affiliation: | a Department of Physical Chemistry, Vilnius University, Naugarduko 24, LT-2006 Vilnius, Lithuania b Faculty of Engineering, University of Kiel, Kaiserstr. 2, D-24143 Kiel, Germany |
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Abstract: | The electroreduction kinetics of silver sulfite complexes was investigated by rotation disk electrode (RDE) voltammetry, chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS). The stability constants of the silver sulfite complexes, pβ2 = 7.9 and pβ3 = 8.53 were determined. For the series of isopotential solutions investigated, a reaction order of 0.67 was obtained, the diffusion coefficient of the silver complexes varies in the range of 3.36 × 10−6 to 5.54 × 10−6 cm2 s−1 and the silver degree of complexation (2.31-2.67) were found. The analysis of the RDE, CP data and EIS spectra indicate the existence of a slow stage of the silver electrocrystallization in the region of the equilibrium potential and at stronger polarization of the electrode at initial time moments. |
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Keywords: | Silver sulfite Electrocrystallization Charge transfer stage Mechanism |
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