Published in

American Chemical Society, Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 46(102), p. 9362-9362, 1998

DOI: 10.1021/jp982236j

American Chemical Society, Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 18(102), p. 3512-3522, 1998

DOI: 10.1021/jp980498f

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Electrochemistry with stationary disk and ring-disk millielectrodes in magnetic fields

Journal article published in 1998 by F. Leventis, Nicholas Leventis, Mg Chen, Xr Gao, Maria Canalas, Peng Zhang ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The most well-known effect of the magnetic field on electrochemical systems is hydrodynamic convection (stirring) of the electrolytic solution. The basic hydrodynamic equations governing mass transport under the magnetic force are well-understood. However, owing to the nonlinear character of those equations and the fact that neither the velocity nor the concentration profile near the electrode is known a priori, rigorous analytical solutions are not available. Retreating to a semiempirical treatment of mass transport, we took the approach of letting the rigorous hydrodynamic equations guide us to the system parameters that should control the steady-state mass-transport-limited current, and subsequently to vary all those parameters systematically using conventional millimeter-sized disk electrodes, and a range of compounds and solvents. To our knowledge, this study comprises the first of its kind, and we concluded that the limiting current i(1) = 4.31 x 10(3) n(f+1)F A(3/4)B(1/3)Dv(-1/4)C(bulk)(4/3), where n is the number of electrons involved in the redox process, F is the Faraday constant, A is the electrode area, B is the magnetic field strength, D is the diffusion coefficient, C-bulk is the bulk concentration of the redox-active species, v is the kinematic viscosity of the electrolyte, and f > 0. The angular flow profile near the electrode surface was mapped using an electrochemical generation/collection method.