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

doi:10.1002/er.7733

Study on the surface segregation of mixed ionic-electronic conductor lanthanum-based perovskite oxide La_1−xSr_xCo_1−yFe_yO₃₋_δ materials

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

Research output: Contribution to journal › Review article › peer-review

16 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 La_1−xSr_xCo_1−yFe_yO_3−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 language	English
Pages (from-to)	7101-7117
Number of pages	17
Journal	International Journal of Energy Research
Volume	46
Issue number	6
DOIs	https://doi.org/10.1002/er.7733
State	Published - May 2022

Keywords

LSCF
MIEC
PCFC
SOFC
strontium segregation
surface modification

Access to Document

10.1002/er.7733

Cite this

@article{2f13624419474e7592f53b79e25739fe,

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

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.",

keywords = "LSCF, MIEC, PCFC, SOFC, strontium segregation, surface modification",

author = "Safian, {Suhaida Dila} and {Abd Malek}, {Nurul Izzati} and Zadariana Jamil and Lee, {Sheng Wei} and Tseng, {Chung Jen} and Nafisah Osman",

note = "Publisher Copyright: {\textcopyright} 2022 John Wiley & Sons Ltd.",

year = "2022",

month = may,

doi = "10.1002/er.7733",

language = "???core.languages.en_GB???",

volume = "46",

pages = "7101--7117",

journal = "International Journal of Energy Research",

issn = "0363-907X",

number = "6",

}

Study on the surface segregation of mixed ionic-electronic conductor lanthanum-based perovskite oxide La_1−xSr_xCo_1−yFe_yO₃₋_δ materials. / Safian, Suhaida Dila; Abd Malek, Nurul Izzati; Jamil, Zadariana et al.
In: International Journal of Energy Research, Vol. 46, No. 6, 05.2022, p. 7101-7117.

Research output: Contribution to journal › Review article › peer-review

TY - JOUR

T1 - Study on the surface segregation of mixed ionic-electronic conductor lanthanum-based perovskite oxide La1−xSrxCo1−yFeyO3−δ materials

AU - Safian, Suhaida Dila

AU - Abd Malek, Nurul Izzati

AU - Jamil, Zadariana

AU - Lee, Sheng Wei

AU - Tseng, Chung Jen

AU - Osman, Nafisah

PY - 2022/5

Y1 - 2022/5

N2 - 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.

AB - 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.

KW - LSCF

KW - MIEC

KW - PCFC

KW - SOFC

KW - strontium segregation

KW - surface modification

UR - http://www.scopus.com/inward/record.url?scp=85124564119&partnerID=8YFLogxK

U2 - 10.1002/er.7733

DO - 10.1002/er.7733

M3 - 回顧評介論文

AN - SCOPUS:85124564119

SN - 0363-907X

VL - 46

SP - 7101

EP - 7117

JO - International Journal of Energy Research

JF - International Journal of Energy Research

IS - 6

ER -