1 Department of Energy Conversion and Storage, Technical University of Denmark2 Mixed Conductors, Department of Energy Conversion and Storage, Technical University of Denmark3 Fundamental Electrochemistry, Department of Energy Conversion and Storage, Technical University of Denmark4 Arak University5 Department of Micro- and Nanotechnology, Technical University of Denmark6 K. N. Toosi University of Technology7 Arak University
A simulation package for the impedance response of SOFC anodes is presented here. The model couples the gas transport in gas channels and within a porous electrode with the electrochemical kinetics. The gas phase mass transport is modeled using mass conservation equations. A transmission line model (TLM), which is suitably modified to account for the electrode microstructural details, is used for modeling the impedance arising from the electrochemical reactions. In order to solve the system of nonlinear equations, an in-house code based on the finite difference method was developed. Some of the model constants have been calibrated against experimental data. It is demonstrated that the simulation tool is capable of predicting the impedance response of an experimental data set obtained on symmetrical cells with Ni/ScYSZ SOFC anodes. A parametric study is also carried out using the developed simulation tool and the results are further discussed.
Fuel Cells, 2014, Vol 14, Issue 4
Electrochemical Impedance Spectroscopy; Gas Diffusion Impedance; Solid Oxide Fuel Cell; Transient Simulation; Transmission Line Model