Analytical, 1-Dimensional Impedance Model of a Composite Solid Oxide Fuel Cell Cathode

Jakob Egeberg Mortensen, Martin Søgaard, Torben Jacobsen

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

An analytical, 1-dimensional impedance model for a composite solid oxide fuel cell cathode is derived. It includes geometrical parameters of the cathode, e.g., the internal surface area and the electrode thickness, and also material parameters, e.g., the surface reaction rate and the vacancy diffusion coefficient. The model is successfully applied to a total of 42 impedance spectra, obtained in the temperature range 555°C–852°C and in the oxygen partial pressure range 0.028 atm–1.00 atm for a cathode consisting of a 50/50 wt% mixture of (La0.6Sr0.4)0.99CoO3 − δ and Ce0.9Gd0.1O1.95 − δ. The surface exchange coefficient in oxygen for T = 802°C and [Formula] is found to be kEx = 1.42 × 10− 4 m s− 1 and with an activation energy of Ea = 107 kJ mol− 1, in fair agreement with literature. A parameter variation and a steady state analysis is performed, verifying the soundness of the model and providing both qualitative and quantitative information on the evolution of the impedance spectra of cathodes with changing parameters.
Original languageEnglish
JournalJournal of the Electrochemical Society
Volume161
Issue number3
Pages (from-to)F161-F175
ISSN0013-4651
DOIs
Publication statusPublished - 2014
Event217th Electrochemical Society Meeting - Vancouver, Canada
Duration: 25 Apr 201030 Apr 2010

Conference

Conference217th Electrochemical Society Meeting
CountryCanada
CityVancouver
Period25/04/201030/04/2010

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