Electrochemical Impedance Modeling of a Solid Oxide Fuel Cell Anode

R. Mohammadi, Martin Søgaard, Tania Ramos, M. Ghassemi, Mogens Bjerg Mogensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalFuel Cells
Volume14
Issue number4
Pages (from-to)645–659
ISSN1615-6846
DOIs
Publication statusPublished - 2014

Keywords

  • Electrochemical Impedance Spectroscopy
  • Gas Diffusion Impedance
  • Solid Oxide Fuel Cell
  • Transient Simulation
  • Transmission Line Model

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