Correlation between fast oxygen kinetics and enhanced performance in Fe doped layered perovskite cathodes for solid oxide fuel cells

Areum Jun, Seonyoung Yoo, Young Wan Ju, Junji Hyodo, Sihyuk Choi, Hu Young Jeong, Jeeyoung Shin, Tatsumi Ishihara, Tak Hyoung Lim, Guntae Kim

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Many researchers have recently focused on layered perovskite oxides as cathode materials for solid oxide fuel cells because of their much higher chemical diffusion and surface exchange coefficients relative to those of ABO3-type perovskite oxides. Herein, we study the catalytic effect of Fe doping into SmBa0.5Sr0.5Co2O5+δ on the oxygen reduction reaction (ORR) and investigate the optimal Fe substitution through an analysis of the structural characteristics, electrical properties, redox properties, oxygen kinetics, and electrochemical performance of SmBa0.5Sr0.5Co2-xFexO5+δ (x = 0, 0.25, 0.5, 0.75, and 1.0). The optimal Fe substitution, SmBa0.5Sr0.5Co1.5Fe0.5O5+δ, enhanced the performance and redox stability remarkably and also led to satisfactory electrical properties and electrochemical performance due to its fast oxygen bulk diffusion and high surface kinetics under typical fuel cell operating conditions. The results suggest that SmBa0.5Sr0.5Co1.5Fe0.5O5+δ is a promising cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs).

Original languageEnglish
Pages (from-to)15082-15090
Number of pages9
JournalJournal of Materials Chemistry A
Volume3
Issue number29
DOIs
Publication statusPublished - Jun 11 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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