Electrochemical study of silver thiosulphate reduction in the absence and presence of ultrasound

The electrochemical reduction of silver thiosulphate was studied potentiostatically on platinum electrodes in the absence and presence of ultrasound (20 kHz). This system is irreversible and the reaction is both diffusion and kinetically controlled. The slowest step is the kinetic reaction especiall...

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Bibliographic Details
Published in:Ultrasonics sonochemistry 2005, Vol.12 (1), p.7-11
Main Authors: Pollet, Bruno, Lorimer, J.P., Hihn, J.-Y., Touyeras, F., Mason, T.J., Walton, D.J.
Format: Article
Language:English
Subjects:
[Ag(S 2O 3) 2] 3−/Ag redox couple
Computer Simulation
Diffusion
Electrochemistry - methods
Electrode kinetics
Kinetics
Models, Chemical
Oxidation-Reduction
Power ultrasound
Silver - chemistry
Silver - isolation & purification
Sonication
Thiosulfates - chemistry
Thiosulfates - radiation effects
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Summary:The electrochemical reduction of silver thiosulphate was studied potentiostatically on platinum electrodes in the absence and presence of ultrasound (20 kHz). This system is irreversible and the reaction is both diffusion and kinetically controlled. The slowest step is the kinetic reaction especially the chemisorption of ions at the electrode surface. Ultrasound greatly improves the mass transport, which can be explained by changing from diffusion to mainly convection. This paper reports the effect of ultrasound upon electrode kinetic and mass-transport parameters at various RDE rotation speeds and ultrasonic intensities. It was found that the heterogeneous rate constant ( k f) is improved in the presence of ultrasound due to the increase in the formal or standard heterogeneous rate constant ( k 0) (approximately by 10-fold under sonication).
ISSN:1350-4177
1873-2828
DOI:10.1016/j.ultsonch.2004.05.006