Abstract
A new computational approach for simulating impedance spectra of solid oxide fuel cells from detailed physicochemical models is presented. It is based on transient numerical simulations (TNS) of the dynamics of the electrochemical system when a periodic variation of overpotential is imposed. Impedance is calculated in the time domain maintaining the full nonlinearity of the system. The method is used to predict impedance of SOFC Ni/YSZ patterned anodes operated with H2/H2O based on a six-step surface electrochemical reaction model taken from literature. Impedance of Ni/YSZ cermet anodes is simulated from coupled models of surface electrochemistry, diffusive porous gas-phase transport, and electronic/ionic conductivity of metal and electrolyte. The simulation results qualitatively agree with literature experimental data. The study shows, however, that the models are not sufficiently detailed for a quantitative description of anodic behavior.
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