| Autor: |
Pongsaksawad, Wanida, Powell IV, Adam C., Dussault, David |
| Předmět: |
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| Zdroj: |
Journal of The Electrochemical Society; Jun2007, Vol. 154 Issue 6, pF122-F133, 12p, 2 Charts, 8 Graphs |
| Abstrakt: |
A phase-field model of electrochemical interface dynamics is developed to study cathode shape and topology change in transport- limited electrolysis in two and three dimensions under conditions of rapid charge redistribution. A case study for the binary model is carried Out for an Fe-FeO system. Stability behavior of the model is in good agreement with linear stability theory for small amplitude sinusoidal perturbation in electrodeposition. When there is no convection, a high electric field and low surface tension cause the cathode interface to be unstable, leading to growth of dendrites which break into powders. When the electrodes and electrolyte are low-viscosity fluids, flow provides an additional mechanism for stabilizing the interface. A new stability criterion for this liquid situation based on the Schmidt number is derived from dimensional analysis and model results. For an unstable cathode interface, a streamer morphology (liquid dendrites) is observed in two and three dimensions. This binary model is extended to a ternary system and a representative case is carried out for the Ti-Mg-Cl system. One- and two-dimensional ternary simulations show qualitatively correct interface motion and electrical potential behavior. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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