Abstract
A hydrodynamic electrochemical method based on a rocking disc system with 90° amplitude and a frequency range of 0.83-16.7 Hz is reported. The system is versatile and similar in characteristics to the familiar rotating disc voltammetry method (e.g. providing a uniform diffusion layer but without sliding contacts), except for the more complex flow pattern imposed by the oscillatory movement. A Levich-type mass transport limited current response linear with the square root of rocking frequency is obtained. Additionally, a dual-semi-disc generator-collector system is demonstrated and characterised for the one-electron quasi-reversible Fe(CN)63-/4- redox couple. Generator-collector current efficiencies vary from 3% to 6% and characteristic transient concentration modulation effects are observed suitable for Fourier transform analysis. Rotational asymmetry in the flow pattern is detected.
| Original language | English |
|---|---|
| Pages (from-to) | 78-82 |
| Number of pages | 5 |
| Journal | Journal of Electroanalytical Chemistry |
| Volume | 722-723 |
| Issue number | 2 |
| Early online date | 14 Mar 2014 |
| DOIs | |
| Publication status | Published - 1 May 2014 |
Funding
SDA thanks Inochem Ltd. and the Faculty of Science, University of Bath, for financial support. ACF thanks the Singapore National Research Foundation under its Campus for Research Excellence and Technological Enterprise (CREATE) programme. AMB thanks the DTC Sustainable Chemical Technologies for supporting a research visit to the University of Bath.
Keywords
- Diffusion
- Electron transfer
- Hydrodynamics
- Rotating disc voltammetry
- Transport
- Turbulence
ASJC Scopus subject areas
- Analytical Chemistry
- General Chemical Engineering
- Electrochemistry