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

Authors
Journal
International Journal of Hydrogen Energy
0360-3199
Publisher
Elsevier
Volume
37
Issue
23
Identifiers
DOI: 10.1016/j.ijhydene.2012.09.048
Keywords
  • Solid Oxide Fuel Cells (Sofc)
  • Layered Perovskite
  • Cathode
  • Electrochemical Performance
Disciplines
  • Chemistry

Abstract

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+δ (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+δ 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 Ω cm2, and the highest single cell performance, 1.039 W cm−2 at 600 °C, are obtained. These results indicate that SmBa1−xSrxCo2O5+δ is optimized at x = 0.75 in terms of obtaining the best performance for IT-SOFCs.

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