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

Bruno Pollet; J. P. Lorimer; J. Y. Hihn; F. Touyeras; T. J. Mason; D. J. Walton

doi:10.1016/j.ultsonch.2004.05.006

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

Bruno Pollet
, J. P. Lorimer
, J. Y. Hihn
, F. Touyeras
, T. J. Mason
, D. J. Walton

Université de Franche-Comté

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

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 (k₀) (approximately by 10-fold under sonication).

Original language	English
Pages (from-to)	7-11
Number of pages	5
Journal	Ultrasonics Sonochemistry
Volume	12
Issue number	1-2
Early online date	25 Sept 2004
DOIs	https://doi.org/10.1016/j.ultsonch.2004.05.006
Publication status	Published - Jan 2005

Keywords

Electrode kinetics
Power ultrasound

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)
Environmental Chemistry
Radiology Nuclear Medicine and imaging
Acoustics and Ultrasonics
Organic Chemistry
Inorganic Chemistry

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title = "Electrochemical study of silver thiosulphate reduction in the absence and presence of ultrasound",

abstract = "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 (kf) is improved in the presence of ultrasound due to the increase in the formal or standard heterogeneous rate constant (k0) (approximately by 10-fold under sonication).",

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AU - Pollet, Bruno

AU - Lorimer, J. P.

AU - Hihn, J. Y.

AU - Touyeras, F.

AU - Mason, T. J.

AU - Walton, D. J.

PY - 2005/1

Y1 - 2005/1

N2 - 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 (kf) is improved in the presence of ultrasound due to the increase in the formal or standard heterogeneous rate constant (k0) (approximately by 10-fold under sonication).

AB - 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 (kf) is improved in the presence of ultrasound due to the increase in the formal or standard heterogeneous rate constant (k0) (approximately by 10-fold under sonication).

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KW - Power ultrasound

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ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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