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Magnetic Field Control of the Potential Distribution and Current at Microdisk Electrodes by Jeonghee Lee; Steven R. Ragsdale; Xiaoping Gao; Henry S. White is a Engineering article available to read on EtoBox.

What is Magnetic Field Control of the Potential Distribution and Current at Microdisk Electrodes about?

Au and Pt microdisk electrodes (6.4, 12.5, and 25 p,m radii) have been used to investigate the influence of a uniform external magnetic field on faradaic reactions. Magnetohydrodynamic flow within a microscopic volume element adjacent to the microdisk surface results in an increase in steady-state limiting voitammetric currents for reduction and oxidation of both neutral and ionic electroactive molecules. The dependence of limiting currents on external field strength suggests the existence of a threshold value of the magnetic force necessary to induce convective flow. Above this threshold value, the voltammetric current is found to increase in proportion both to the external magnetic field strength and to the steady-state current measured in the absence of the field. The results are used to establish an empirical correlation between faradaic currents and the magnetic force acting on the solution within the depletion layer. In low ionic strength solutions, the external magnetic field also reduces the electrostatic driving force for electron-transfer. This magnetic field-induced reaction overpotential is shown to result from a steady-state displacement of charge-balancing counterions

Who reads Magnetic Field Control of the Potential Distribution and Current at Microdisk Electrodes?

Author

Jeonghee Lee; Steven R. Ragsdale; Xiaoping Gao; Henry S. White

Publisher

Elsevier ; Elsevier BV (ISSN 1572-6657)

Published

1997

Language

EN

Field

Engineering (Physical Sciences)