TY - JOUR
T1 - Effects of magnetic field directed orthogonally to surfaces on electrochemical processes
AU - Lioubashevski, Oleg
AU - Katz, Eugenii
AU - Willner, Itamar
PY - 2007/4/26
Y1 - 2007/4/26
N2 - 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 ≈0.5Χm1/3(μoρ) -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.
AB - 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 ≈0.5Χm1/3(μoρ) -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.
UR - http://www.scopus.com/inward/record.url?scp=34248338380&partnerID=8YFLogxK
U2 - 10.1021/jp069055z
DO - 10.1021/jp069055z
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AN - SCOPUS:34248338380
SN - 1932-7447
VL - 111
SP - 6024
EP - 6032
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 16
ER -