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Kim, Guntae
GUNS Lab
Research Interests
  • Solid Oxide Fuel Cells (SOFCs)& SOE, metal-air batteries, ceramic membranes, PEMFC

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Optimization of Sr content in layered SmBa1-xSrxCo2O5+delta perovskite cathodes for intermediate-temperature solid oxide fuel cells

Cited 12 times inthomson ciCited 11 times inthomson ci
Title
Optimization of Sr content in layered SmBa1-xSrxCo2O5+delta perovskite cathodes for intermediate-temperature solid oxide fuel cells
Author
Jun, AreumKim, JunyoungShin, JeeyoungKim, Guntae
Keywords
Area-specific resistances; Cathode materials; Electrical conductivity; Electrochemical performance; Electronic holes; Intermediate temperature solid oxide fuel cell; Interstitial oxygen; IT-SOFCs; Layered perovskite; Ordered perovskite; Single cell performance
Issue Date
201212
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.37, no.23, pp.18381 - 18388
Abstract
Cation ordered perovskites have been recognized as advanced cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). This study focuses on the effects of Sr substitution on crystal characteristics, electrical properties, and electrochemical performance of SmBa1-xSrxCo2O5+delta (x = 0, 0.25, 0.5, 0.75, and 1.0) as an IT-SOFC cathode material. The electrical conductivity improves with increasing Sr content due to the greater amount of electronic holes originated from the increased interstitial oxygen. The area specific resistances (ASRs) of SmBa1-xSrxCo2O5, decrease with Sr content up to x = 0.75 and increase abruptly for x = 1. For x = 0.75, the lowest ASR value, 0.138 Omega cm(2), and the highest single cell performance, 1.039 W cm(-2) at 600 degrees C, are obtained. These results indicate that SmBa1-xSrxCo2O5+delta is optimized at x = 0.75 in terms of obtaining the best performance for IT-SOFCs.
URI
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DOI
http://dx.doi.org/10.1016/j.ijhydene.2012.09.048
ISSN
0360-3199
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