INVESTIGADORES
SOBA Alejandro
artículos
Título:
Ion transport in thin cell electrodeposition: modelling three-ion electrolytes in dense branched morphology under constant voltage and current conditions
Autor/es:
MARSHALL; MOLINA; SOBA
Revista:
ELECTROCHIMICA ACTA
Referencias:
Año: 2005 vol. 50 p. 3436 - 3445
ISSN:
0013-4686
Resumen:
Electrochemical deposition (ECD) and spatially coupled bipolar electrochemistry
(SCBE) experiments in thin-layer cells are known to produce complex ion transport
patterns concomitantly with the growth of dendrite-like structures. Here we present a
macroscopic model of ECD and SCBE with a three-ion electrolyte in conditions of
dense branched morphology. The model describes ion transport and deposit growth
through the one-dimensional NernstPlanck equations for ion transport, the Poisson
equation for the electric field and, for ECD, a growth law for deposit evolution. We
present numerical simulations for typical electrochemical deposition experiments: dense
branched morphology in ECD and the incubation period in SCBE. In ECD the model
predicts cation, anion and proton concentration profiles, electric field variations and
deposit growth speed, that are in qualitative agreement with experiments; the predicted
evolution and collision of the deposit and proton fronts reveal a time scaling close to
those observed in experiments. In SCBE, the model predicts that the inverse of the
incubation time scales linearly with the applied voltage. Such behaviour was observed
in experiments.