Comparison of chromium poisoning between lanthanum strontium manganite and lanthanum strontium ferrite composite cathodes in solid oxide fuel cells

Wang, Ruofan; Sun, Zhihao; Lu, Yanchen; Gopalan, Srikanth; Basu, Soumendra N.; Pal, Uday B.

doi:10.1016/j.jpowsour.2020.228743

Title: Comparison of chromium poisoning between lanthanum strontium manganite and lanthanum strontium ferrite composite cathodes in solid oxide fuel cells

Journal Article · Mon Aug 17 00:00:00 EDT 2020 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2020.228743· OSTI ID:1849126

^[1]; Sun, Zhihao ^[1]; Lu, Yanchen ^[1]; Gopalan, Srikanth ^[2]; Basu, Soumendra N. ^[2]; Pal, Uday B. ^[2]

Boston Univ., MA (United States). Dept. of Materials Science and Engineering
Boston Univ., MA (United States). Dept. of Materials Science and Engineering; Boston Univ., MA (United States). Dept. of Mechanical Engineering

Degradation mechanisms of chromium poisoning have been extensively investigated for last two decades on various cathode materials for solid oxide fuel cells. While most researchers used half-cell experiments to investigate the effects of chromium impurities, this paper compares the degradation phenomena of LSM-YSZ and LSF-GDC cathodes in full cells under different operating conditions, namely polarized current density and humidity over the cathode. Under cathodic load, performance degradation of LSF-GDC cathode is significantly less than that of LSM-YSZ cathode. Most interestingly, under humidified air condition, LSF-based cell hardly experiences performance degradation while LSM-based cell shows a catastrophic degradation. Cr deposition in LSM-based cells occurs mainly near the electrolyte under both dry and humidified air conditions. In contrast, Cr deposition in LSF-based cell concentrates at the cathode surface under dry air condition, but concentrates both at cathode surface and near electrolyte under humidified air condition. Microstructure analysis reveals Mn-associated Cr deposits in LSM-based cathode, and Sr- and Fe-associated Cr deposits in LSF-based cathode. With the help of distribution of relaxation time analysis, the different electrochemical behaviors of LSM- and LSF-based cells are carefully interpreted. The effects of electrochemical deposition, Sr surface segregation, and humidity on LSM- and LSF-based cathodes are discussed.

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Research Organization:: Boston Univ., MA (United States)

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

Grant/Contract Number:: FE0023325

OSTI ID:: 1849126

Alternate ID(s):: OSTI ID: 1647697

Journal Information:: Journal of Power Sources, Vol. 476, Issue C; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Comparison of chromium poisoning between lanthanum strontium manganite and lanthanum strontium ferrite composite cathodes in solid oxide fuel cells

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