Hydrodynamic voltammetry at a rocking disc electrode

theory versus experiment

Sunyhik D. Ahn, Karthik Somasundaram, H. Viet Nguyen, Erik Birgersson, Jim Yang Lee, Xiangming Gao, Adrian C. Fisher, Paul E. Frith, Frank Marken

Research output: Contribution to journalArticle

5 Citations (Scopus)
153 Downloads (Pure)

Abstract

Rocking disc electrode voltammetry (RoDE) is introduced as an experimentally convenient and versatile alternative to rotating disc voltammetry. A 1.6 mm diameter disc electrode is employed with an overall rocking angle of θ = 90 degree applied over a frequency range of 0.83 Hz to 25 Hz. For a set of known aqueous redox systems (the oxidation of Fe(CN)64- in 1 M KCl, the reduction of Ru(NH3)63+ in 0.1 M KCl, the oxidation of hydroquinone in 0.1 M pH 7 phosphate buffer, the oxidation of I- in 0.125 M H2SO4, and the reduction of H+ in 1 M KCl) the mass transport controlled limiting current Ilim is demonstrated to follow in good approximation the Levich-type expression Ilim=0.111 nFAcD2/3v-1/6√Θf with n, the number of electrons transferred per molecule diffusing to the electrode surface, F, the Faraday constant, A, the geometric area, c, the concentration of the active redox species, D, the diffusion coefficient, v, the kinematic viscosity, θ is the overall rocking angle in degree, and f, the rocking rate in Hz. Quantitative theory is developed based on a two-dimensional (2D) axisymmetric laminar flow model accounting for the conservation of mass, momentum and species along with the kinematic analysis of a "four-bar mechanism" to obtain the rocking motion.

Original languageEnglish
Pages (from-to)837-844
Number of pages8
JournalElectrochimica Acta
Volume188
DOIs
Publication statusPublished - 10 Jan 2016

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Voltammetry
Hydrodynamics
Oxidation
Electrodes
Experiments
Rotating disks
Laminar flow
Conservation
Momentum
Buffers
Kinematics
Phosphates
Mass transfer
Viscosity
Molecules
Electrons
Oxidation-Reduction

Keywords

  • Convection
  • Hydrodynamic modulation
  • Ionic liquid
  • Plating
  • Viscosity

Cite this

Ahn, S. D., Somasundaram, K., Nguyen, H. V., Birgersson, E., Lee, J. Y., Gao, X., ... Marken, F. (2016). Hydrodynamic voltammetry at a rocking disc electrode: theory versus experiment. Electrochimica Acta, 188, 837-844. https://doi.org/10.1016/j.electacta.2015.11.143

Hydrodynamic voltammetry at a rocking disc electrode : theory versus experiment. / Ahn, Sunyhik D.; Somasundaram, Karthik; Nguyen, H. Viet; Birgersson, Erik; Lee, Jim Yang; Gao, Xiangming; Fisher, Adrian C.; Frith, Paul E.; Marken, Frank.

In: Electrochimica Acta, Vol. 188, 10.01.2016, p. 837-844.

Research output: Contribution to journalArticle

Ahn, SD, Somasundaram, K, Nguyen, HV, Birgersson, E, Lee, JY, Gao, X, Fisher, AC, Frith, PE & Marken, F 2016, 'Hydrodynamic voltammetry at a rocking disc electrode: theory versus experiment', Electrochimica Acta, vol. 188, pp. 837-844. https://doi.org/10.1016/j.electacta.2015.11.143
Ahn SD, Somasundaram K, Nguyen HV, Birgersson E, Lee JY, Gao X et al. Hydrodynamic voltammetry at a rocking disc electrode: theory versus experiment. Electrochimica Acta. 2016 Jan 10;188:837-844. https://doi.org/10.1016/j.electacta.2015.11.143
Ahn, Sunyhik D. ; Somasundaram, Karthik ; Nguyen, H. Viet ; Birgersson, Erik ; Lee, Jim Yang ; Gao, Xiangming ; Fisher, Adrian C. ; Frith, Paul E. ; Marken, Frank. / Hydrodynamic voltammetry at a rocking disc electrode : theory versus experiment. In: Electrochimica Acta. 2016 ; Vol. 188. pp. 837-844.
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