Study on the surface segregation of mixed ionic-electronic conductor lanthanum-based perovskite oxide La1−xSrxCo1−yFeyO3−δ materials

Suhaida Dila Safian, Nurul Izzati Abd Malek, Zadariana Jamil, Sheng Wei Lee, Chung Jen Tseng, Nafisah Osman

Research output: Contribution to journalReview articlepeer-review

2 Scopus citations

Abstract

High-temperature solid oxide fuel cells (HT-SOFCs) generally operate at 800°C to 1000°C and intermediate temperature SOFCs (IT-SOFCs) at 600°C to 800°C. Reducing the SOFCs operational from high to ITs results in many issues mainly at the cathode site. One of the shortcomings that have been addressed is high polarization losses associated with oxygen reduction reaction (ORR) and degradation of La1−xSrxCo1−yFeyO3−δ (LSCF) cathode materials. Strontium (Sr) has been discovered to segregate and inhibit the surface-active site for the ORR under specified conditions (temperature, relative humidity, and suppressing activity). It enriched the surface, formed Sr-rich secondary phases, and eventually changes the composition and the structure of the perovskite surfaces. Therefore, this review aims to summarize the occurrences of Sr segregation at the LSCF cathode surfaces as a function of operating conditions and their effects on the material performance. In addition, the characterization techniques utilized to investigate the Sr segregation, and strategies for Sr segregation mitigation are also discussed.

Original languageEnglish
Pages (from-to)7101-7117
Number of pages17
JournalInternational Journal of Energy Research
Volume46
Issue number6
DOIs
StatePublished - May 2022

Keywords

  • LSCF
  • MIEC
  • PCFC
  • SOFC
  • strontium segregation
  • surface modification

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