Sonoelectrochemistry in highly resistive media: Mass transport effects

Journal article

Sonovoltammetry methodology is studied for the enhancement of electrochemical processes in highly resistive media. As model systems the reduction of [FeCp*2]PF6 (with Cp℧ = η5-C5Me5) and the oxidation of FeCp*2 in acetonitrile are examined at a 25 μm diameter Pt microdisk electrode. Both in the presence and in the absence of supporting electrolyte ultrasound induces a strong increase in the observed limiting current in agreement with an increase in mass transport or, associated with this, a change in the average diffusion layer thickness. However, iR drop effects cause distortion of voltammetric waves, potential fluctuation, and ultrasonically induced current decrease under conditions of extremely low ionic strength.

Authors: Marken, F; Goldfarb, D; Compton, R

• Publication status: Published
• Journal: ELECTROANALYSIS
• Volume: 10
• Issue: 8
• Pages: 562-566
• Publication date: 1998-07-01
• DOI: 10.1002/(SICI)1521-4109(199807)10:8<562::AID-ELAN562>3.3.CO;2-Z
• ISSN: 1040-0397
• Language: English
• Keywords: resistive media; migration; sonoelectrochemistry; microelectrode; ultrasound