Combined Cr and S poisoning behaviors of La1-xSrxMnO3±δ and La1-xSrxCo1-yFeyO3-δ cathodes in solid oxide fuel cells

Hong, Junsung; Heo, Su Jeong; Singh, Prabhakar

doi:10.1016/j.apsusc.2020.147253

Title: Combined Cr and S poisoning behaviors of La_1-xSr_xMnO_3±δ and La_1-xSr_xCo_1-yFeyO_3-δ cathodes in solid oxide fuel cells

Journal Article · Sun Nov 01 00:00:00 EDT 2020 · Applied Surface Science

DOI:https://doi.org/10.1016/j.apsusc.2020.147253· OSTI ID:1849132

Hong, Junsung ^[1]; Heo, Su Jeong ^[1]; Singh, Prabhakar ^[1]

Univ. of Connecticut, Storrs, CT (United States). Dept. of Materials Science and Engineering

Although the individual effects of airborne Cr and S contaminants on SOFC cathode performance degradation have been extensively studied, the combined effects of Cr and S contaminants remain largely unexplored. Under the real SOFC operating condition where the Cr and S species coexist, their effects may compete, affecting the poisoning behavior. Here, our investigation reveals that the combined Cr and S poisoning behavior of LSCF remains different from those of individual Cr and S poisonings, while the combined poisoning mechanism of LSM is equivalent to the sum of those of individual Cr and S effects. For LSCF electrode, gaseous Cr species are deposited mainly at the LSCF/GDC interface by electrochemical reduction, rather than forming SrCrO₄ on LSCF surfaces (as in the case of Cr-only poisoning), indicating no reaction between Cr vapors and SrO on the LSCF surface. Thermodynamic analysis demonstrates that the SrO on LSCF surface absorbs SO₂ (g) and thereby loses the Cr-gettering effect, allowing Cr vapors to flow through LSCF and to reach the LSCF/GDC interface where the Cr deposition occurs. Unlike LSCF, LSM electrode shows cumulative effects of Cr and S, as Cr accumulation occurs at the triple-phase boundary and S absorption takes place at localized Sr-rich regions.

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Research Organization:: Univ. of Connecticut, Storrs, CT (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0023385; FE 0023385

OSTI ID:: 1849132

Alternate ID(s):: OSTI ID: 1835176

Journal Information:: Applied Surface Science, Vol. 530, Issue C; ISSN 0169-4332

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Combined Cr and S poisoning behaviors of La1-xSrxMnO3±δ and La1-xSrxCo1-yFeyO3-δ cathodes in solid oxide fuel cells

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Title: Combined Cr and S poisoning behaviors of La_1-xSr_xMnO_3±δ and La_1-xSr_xCo_1-yFeyO_3-δ cathodes in solid oxide fuel cells