Abstract
We present a phase field model that tracks species, phase, and charge distribution in electrochemical systems with chemically active species. The governing partial differential equations are derived from a simple set of assumptions including ideal bulk solution thermodynamics, a method of interpolating between bulk phases, physical balance laws, and the second law of thermodynamics. A source term for the conservation of mass expression captures the behavior of the chemical reactions through the interface and in the bulk phases. As a demonstration, a solid electrolyte gas sensor is modeled. This simulated gas sensor calculates EMF in response to a changing level of an active gas in the bulk gas phase.
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