Modeling Electro-Chemo-Mechanical Behaviors within the Dense BaZr_0.8Y_0.2O_{3−<em>δ</em>} Protonic-Ceramic Membrane in a Long Tubular Electrochemical Cell

Abstract

This paper reports an extended Nernst–Planck computational model that couples charged-defect transport and stress in tubular electrochemical cell with a ceramic proton-conducting membrane. The model is particularly concerned with coupled chemo-mechanical behaviors, including how electrochemical phenomena affect internal stresses and vice versa. The computational model predicts transient and steady-state defect concentrations, fluxes, stresses within a thin BaZr0.8Y0.2O3−δ (BZY20) membrane. Depending on the polarization (i.e., imposed current density), the model predicts performance as a fuel cell or an electrolyzer. A sensitivity analysis reveals the importance of thermodynamic and transport properties, which are often not readily available.

Keywords

• electrochemistry
• transport-induced stress
• ceramic-proton-conducting membranes
• BZY20