Mass transport and modulation effects in rocking dual-semi-disc electrode voltammetry

Sunyhik D. Ahn; Paul E. Frith; Adrian C. Fisher; Alan M. Bond; Frank Marken

doi:10.1016/j.jelechem.2014.02.018

Mass transport and modulation effects in rocking dual-semi-disc electrode voltammetry

Sunyhik D. Ahn, Paul E. Frith, Adrian C. Fisher, Alan M. Bond, Frank Marken

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

6 Citations (Scopus)

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)₆^3-/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	https://doi.org/10.1016/j.jelechem.2014.02.018
Publication status	Published - 1 May 2014

Keywords

Diffusion
Electron transfer
Hydrodynamics
Rotating disc voltammetry
Transport
Turbulence

ASJC Scopus subject areas

Analytical Chemistry
Chemical Engineering(all)
Electrochemistry

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10.1016/j.jelechem.2014.02.018

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title = "Mass transport and modulation effects in rocking dual-semi-disc electrode voltammetry",

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.",

keywords = "Diffusion, Electron transfer, Hydrodynamics, Rotating disc voltammetry, Transport, Turbulence",

author = "Ahn, {Sunyhik D.} and Frith, {Paul E.} and Fisher, {Adrian C.} and Bond, {Alan M.} and Frank Marken",

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AU - Ahn, Sunyhik D.

AU - Frith, Paul E.

AU - Fisher, Adrian C.

AU - Bond, Alan M.

AU - Marken, Frank

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AB - 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.

KW - Diffusion

KW - Electron transfer

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KW - Rotating disc voltammetry

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