Degradation mechanism of SOFC cathodes under CrO3 and SO 2 impurity exposures

T. Horita; D. H. Cho; F. Wang; M. Nishi; T. Shimonosono; H. Kishimoto; K. Yamaji; M. E. Brito; H. Yokokawa

doi:10.1149/05101.0069ecst

Degradation mechanism of SOFC cathodes under CrO₃ and SO ₂ impurity exposures

T. Horita, D. H. Cho, F. Wang, M. Nishi, T. Shimonosono, H. Kishimoto, K. Yamaji, M. E. Brito, H. Yokokawa

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

11 Citations (Scopus)

Abstract

The effects of Cr-and S-impurities on the cathode performances were examined at the mixed ionic-electronic conducting La_0.6Sr _0.4Co_0.2Fe_0.8O₃ (LSCF) cathode. Under exposures to CrO₃ and SO₂, the cathode performance decreased drastically by forming SrCrO₄ and SrSO₄ at the LSCF grain surfaces and electrochemical active sites. The main degradation factors of LSCF cathode was the decrease of surface reaction rates by the impurities. The Sr-diffusion and depletion in the LSCF structures can affect the cathode performance degradation. Relatively large amounts of Sr were depleted in the LSCF grains under CrO₃ exposures by forming a thick SrCrO ₄ at the Pt-mesh/LSCF cathode interfaces, while small amounts of Sr-depletion in the LSCF grains under SO₂ exposures.

Original language	English
Title of host publication	Fuel Cell Seminar 2012
Pages	69-77
Number of pages	9
Edition	1
DOIs	https://doi.org/10.1149/05101.0069ecst
Publication status	Published - 2013
Externally published	Yes
Event	Fuel Cell Seminar and Exposition 2012 - Uncasville, CT, United States Duration: 2012 Nov 5 → 2012 Nov 8

Publication series

Name	ECS Transactions
Number	1
Volume	51
ISSN (Print)	1938-5862
ISSN (Electronic)	1938-6737

Other

Other	Fuel Cell Seminar and Exposition 2012
Country/Territory	United States
City	Uncasville, CT
Period	12/11/5 → 12/11/8

ASJC Scopus subject areas

Engineering(all)

Access to Document

10.1149/05101.0069ecst

Cite this

Horita, T, Cho, DH, Wang, F, Nishi, M, Shimonosono, T, Kishimoto, H, Yamaji, K, Brito, ME & Yokokawa, H 2013, Degradation mechanism of SOFC cathodes under CrO₃ and SO ₂ impurity exposures. in Fuel Cell Seminar 2012. 1 edn, ECS Transactions, no. 1, vol. 51, pp. 69-77, Fuel Cell Seminar and Exposition 2012, Uncasville, CT, United States, 12/11/5. https://doi.org/10.1149/05101.0069ecst

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abstract = "The effects of Cr-and S-impurities on the cathode performances were examined at the mixed ionic-electronic conducting La0.6Sr 0.4Co0.2Fe0.8O3 (LSCF) cathode. Under exposures to CrO3 and SO2, the cathode performance decreased drastically by forming SrCrO4 and SrSO4 at the LSCF grain surfaces and electrochemical active sites. The main degradation factors of LSCF cathode was the decrease of surface reaction rates by the impurities. The Sr-diffusion and depletion in the LSCF structures can affect the cathode performance degradation. Relatively large amounts of Sr were depleted in the LSCF grains under CrO3 exposures by forming a thick SrCrO 4 at the Pt-mesh/LSCF cathode interfaces, while small amounts of Sr-depletion in the LSCF grains under SO2 exposures.",

author = "T. Horita and Cho, {D. H.} and F. Wang and M. Nishi and T. Shimonosono and H. Kishimoto and K. Yamaji and Brito, {M. E.} and H. Yokokawa",

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T1 - Degradation mechanism of SOFC cathodes under CrO3 and SO 2 impurity exposures

AU - Horita, T.

AU - Cho, D. H.

AU - Wang, F.

AU - Nishi, M.

AU - Shimonosono, T.

AU - Kishimoto, H.

AU - Yamaji, K.

AU - Brito, M. E.

AU - Yokokawa, H.

PY - 2013

Y1 - 2013

N2 - The effects of Cr-and S-impurities on the cathode performances were examined at the mixed ionic-electronic conducting La0.6Sr 0.4Co0.2Fe0.8O3 (LSCF) cathode. Under exposures to CrO3 and SO2, the cathode performance decreased drastically by forming SrCrO4 and SrSO4 at the LSCF grain surfaces and electrochemical active sites. The main degradation factors of LSCF cathode was the decrease of surface reaction rates by the impurities. The Sr-diffusion and depletion in the LSCF structures can affect the cathode performance degradation. Relatively large amounts of Sr were depleted in the LSCF grains under CrO3 exposures by forming a thick SrCrO 4 at the Pt-mesh/LSCF cathode interfaces, while small amounts of Sr-depletion in the LSCF grains under SO2 exposures.

AB - The effects of Cr-and S-impurities on the cathode performances were examined at the mixed ionic-electronic conducting La0.6Sr 0.4Co0.2Fe0.8O3 (LSCF) cathode. Under exposures to CrO3 and SO2, the cathode performance decreased drastically by forming SrCrO4 and SrSO4 at the LSCF grain surfaces and electrochemical active sites. The main degradation factors of LSCF cathode was the decrease of surface reaction rates by the impurities. The Sr-diffusion and depletion in the LSCF structures can affect the cathode performance degradation. Relatively large amounts of Sr were depleted in the LSCF grains under CrO3 exposures by forming a thick SrCrO 4 at the Pt-mesh/LSCF cathode interfaces, while small amounts of Sr-depletion in the LSCF grains under SO2 exposures.

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