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Investigation of Cathode Behavior of Model Thin Film SrTi1-xFexO3-δ Mixed Ionic-Electronic Conducting Electrodes

Published online by Cambridge University Press:  01 February 2011

Harry L. Tuller ,
WooChul Jung  and
Kengo Haga
Harry L. Tuller
Affiliation:
[email protected], MIT, Materials Science and Engineering, Cambridge, Massachusetts, United States
WooChul Jung
Affiliation:
[email protected], MIT, Materials Science and Engineering, Cambridge, Massachusetts, United States
Kengo Haga
Affiliation:
[email protected], MIT, Materials Science and Engineering, Cambridge, Massachusetts, United States
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Abstract

The defect structure, transport properties and band structure of the perovskite solid solution SrTi1-xFexO3-δ (STF) can be systematically controlled, over wide limits, by variation in the Fe fraction. In this paper, the authors review recent results which show that STF exhibits model mixed ionic-electronic conducting cathode behavior and extend the composition range investigated to include compositions from SrTiO3 rich values (x = 0.05) to SrFeO3-δ (x= 1). While the majority of the cathodes were prepared as dense films by pulsed layer deposition (PLD), selected compositions were also prepared by thermal inkjet printing. The cathodes were investigated by electrochemical impedance spectroscopy (EIS) as a function of electrode geometry, temperature and oxygen partial pressure. The electrode behavior was found to be controlled by surface exchange kinetics in almost all cases. Values for the surface exchange coefficient, k, were derived and found to be comparable in magnitude to those exhibited by other popular mixed ionic-electronic conductors such as (La,Sr)(Co,Fe)O3, thereby, confirming STF's suitability of as a model mixed conducting cathode material. Surprisingly, the magnitude of k was found to be only weakly dependent on the bulk electronic and ionic conductivities of STF which varied by many orders of magnitude (over nearly five orders of magnitude change in σel) over the x values examined in this study. The observed trends are discussed in relation to the known defect and transport properties of STF.

Keywords

defectsionic conductorink-jet printing
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1126: Symposium S – Solid-State Ionics–2008 , 2008 , 1126-S01-01
Copyright
Copyright © Materials Research Society 2009

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