Effects of magnetic field directed orthogonally to surfaces on electrochemical processes

Oleg Lioubashevski, Eugenii Katz, Itamar Willner*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

The study provides a model for the effect on electrochemical processes of a magnetic field that is directed perpendicular to a planar electrode surface. The analysis assumes the formation of a hydrodynamic boundary layer of the fluid motion that is generated above a semi-infinite electrode as a result of magnetic force action. For a uniform magnetic field, the model predicts the decrease of the diffusion boundary layer thickness upon increasing either the magnetic field strength, B, or the reagent bulk concentration, C, with the power dependence corresponding to C 4/3B 2/3. The limiting current density, iL, is formulated as iL ≈0.5Χm1/3oρ) -1/3R5/3D5/9ν-2/9nFC 4/3B2/3. This permits semiquantitative interpretation of the enhanced mass transfer at electrode surfaces for electrochemical reactions and predicts a magnetic field effect on mass transfer-limited heterogeneous reactions of magnetic species. The results imply that the perpendicular magnetic field will affect any mass transport limited transformation involving paramagnetic species at flat surfaces.

Original languageEnglish
Pages (from-to)6024-6032
Number of pages9
JournalJournal of Physical Chemistry C
Volume111
Issue number16
DOIs
StatePublished - 26 Apr 2007

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