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Investigation of Cathode Kinetics in SOFC: Model Thin Film SrTi_(1-x)Fe_xO_(3-δ) Mixed Conducting Oxides

Jung, WooChul and Tuller, Harry L. (2011) Investigation of Cathode Kinetics in SOFC: Model Thin Film SrTi_(1-x)Fe_xO_(3-δ) Mixed Conducting Oxides. In: Solid Oxide Fuel Cells 12 (SOFC XII). ECS Transactions . No.35. Electrochemical Society , Pennington, NJ, pp. 2129-2136. ISBN 978-1-60768-212-7.

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To understand the kinetics controlling the SOFC cathode processes, a model mixed conducting perovskite materials system, SrTi_(1-x)Fe_xO_(3-δ), was selected, offering the ability to systematically control both the levels of electronic and ionic electrical conductivity as well as the energy band structure. This, in combination with considerably simplified electrode geometry, served to demonstrate that the rate of oxygen exchange at the surface of SrTi_(1-x)Fe_xO_(3-δ) is only weakly correlated with either high electronic or ionic conductivity, in apparent contradiction with common expectations. On the other hand, evidence was found suggesting the importance of minority electronic species in determining the rate of oxygen exchange. Furthermore, the enrichment of Sr to the surface of the electrodes was found to reduce the oxygen exchange rate constant; this effect becoming more evident with increasing values of x. The observed trends are discussed in relation to the cathodic behavior of MIEC electrodes.

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Additional Information:© 2011 The Electrochemical Society. This work was initially supported by the Ceramics Program, Division of Materials Research Directorate for Mathematical & Physical Sciences, National Science Foundation under award DMR-0243993 and continued under the Materials Science and Engineering Division, Office of Basic Energy Sciences, Department of Energy under award DE SC0002633. W.J. Thanks the Samsung Foundation for fellowship support. The authors thank Dr. R.A. De Souza and Dr. J. Fleig for helpful discussions. The x-ray, XPS and AFM facilities of the Center for Materials Science and Engineering, an NSF MRSEC funded facility, were used in this study.
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Department of Energy (DOE) Materials Science and Engineering DivisionDE SC0002633
Samsung FoundationUNSPECIFIED
Series Name:ECS Transactions
Issue or Number:35
Record Number:CaltechAUTHORS:20120412-134556825
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Official Citation:Investigation of Cathode Kinetics in SOFC: Model Thin Film SrTi[sub 1-x]Fe[sub x]O[sub 3-delta ] Mixed Conducting Oxides WooChul Jung and Harry L. Tuller, ECS Trans. 35, 2129 (2011), DOI:10.1149/1.3570204
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:30070
Deposited By: Tony Diaz
Deposited On:17 Apr 2012 18:28
Last Modified:03 Oct 2019 03:47

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