Influence of ultrasound on the kinetic parameters of electrochemical redox reactions

Abstract

The aim of this work is to determine the Tafel parameters with and without ultrasound. The total overvoltage has been corrected for diffusion by using rotating disk technique and potentiostatic extrapolation to infinite rotating speed. Three well known redox systems have been selected regardless to their different electrochemical behaviour: the quinone-hydroquinone, the Fe(II)Fe(III) chlorides and Fe(II)-Fe(III) cyanide systems. This work shows that the reversibility is higher with ultrasound only in the case of the quinone-hydroquinone system.

Electrochemical Applications of Power Ultrasound

“…Birkin has used sampled voltammetry at insonated microelectrodes with single and double potential step chronoamperometry to probe the electron transfer rates for the Ru (NH 3 ) 6 3 þ /2 þ and IrCl 6 3À/2À redox couples and found good agreement with results obtained under silent conditions [28]. In addition, Fontana has reported that for the Fe 2 þ /3 þ and Fe(CN) 6 3À/4À systems ultrasound has no other effect than to improve mass transport [32]. The conclusion is drawn, therefore, that ultrasound has little or no effect in simple electron transfer processes.…”

Electrodeposition of PbO2 on glassy carbon electrodes: influence of ultrasound frequency

“…The majority of studies coupling electrochemistry with ultrasound have employed low frequency high power ultrasound and have highlighted that the sole effect was the change in the apparent reversibility of the electron transfer process by promoting mass transport and when the effect of the latter is corrected for, no change in the heterogeneous rate constants for electron transfer was seen in the presence of ultrasound [34]. However, for a less reversible system, ultrasound improves the reversibility [35].…”

Effect of Ultrasound on the Production Reaction Kinetics of Sodium Thiosulfate

“…The effect of ultrasound on the kinetics of the reduction of hexacyanoferrate (III) by thiosulfate ions mediated by ruthenium dioxide hydrate was investigated by Mills et al [8]. The influence of ultrasound on the kinetic parameters of electrochemical redox reactions was investigated by Jung et al [9]. The kinetics of the acidcatalyzed hydrolysis of ethyl acetate in ethanol-water binary solutions was investigated by Tuulmets and Salmar [10].…”