Interaction of (La1−xSrx)nCo1−yFeyO3−δ cathodes and AISI 441 interconnect for solid oxide fuel cells

Li, Wenle; Lu, Kathy; Xia, Zhenbo

doi:10.1016/j.jpowsour.2013.03.012

Cited by 18 publications

(12 citation statements)

References 38 publications

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“…The low concentration of Co is obvious, regardless of the thermal treatment atmosphere. This indicates the instability of Co in the LSCF6428 cathode, consistent with other studies [39,40]. Cr at the interface of the cathode/electrolyte is a result of diffusion from the interconnect and reaction at the triple phase boundaries.…”

Section: Fundamental Processsupporting

confidence: 90%

“…This technique has been used by others and explained before [34][35][36][37][38][39][40]. In the circuit, R Ω is the ohmic resistance from the cathode, the Pt wires, the Pd paste, the contact between the interconnect and the cathode, and the electrolyte; however, the major contribution and especially the changes are from the cathode.…”

Section: Electrochemical Behaviorsmentioning

confidence: 99%

“…These results mean that the LSCF6428 electrodes have much lower ohmic resistance compared to the LSM821 electrodes. Fundamentally, this means that the LSCF6428 cathode has better contacts with other cell components and better polaron conduction [18,35,40,41].…”

Section: Original Research Papermentioning

confidence: 99%

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Moisture Effect on La_0.8Sr_0.2MnO₃ and La_0.6Sr_0.4Co_0.2Fe_0.8O₃ Cathode Behaviors in Solid Oxide Fuel Cells

Shen

2014

Fuel Cells

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Moisture effect on cathode behaviors is a major issue for solid oxide fuel cells servicing under severe high temperature environments. This work studies the effect of dry air and moist air on La 0.8 Sr 0.2 MnO 3 (LSM821) and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF6428) cathodes at 800°C by investigating the interfacial reaction and degradation through an AISI 441 interconnect/ LSM821 (LSCF6428) electrode/yttria-stabilized zirconia (YSZ) electrolyte tri-layer structure. Under the same processing condition, the grain size of the LSCF6428 cathode is smaller than that of the LSM821 cathode. Ohmic resistance and polarization resistance of the cathodes are analyzed by deconvoluting the electrochemical impedance spectroscopy (EIS) results. The LSCF6428 cathode has much smaller resistance than the LSM821 cathode. Moisture produces a larger effect on the ohmic resistance and polarization resistance of the LSM821 cathode than on those of the LSCF6428 cathode. More chromium diffuses from the interconnect to the cathode for both LSM821 and LSCF6428 electrodes thermally treated in moist air. Based on the structure, elemental distribution, and EIS analysis, the interaction mechanisms between the electrodes and the AISI 441 alloy interconnect are proposed.

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Section: Fundamental Processsupporting

confidence: 90%

Section: Electrochemical Behaviorsmentioning

confidence: 99%

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Moisture Effect on La_0.8Sr_0.2MnO₃ and La_0.6Sr_0.4Co_0.2Fe_0.8O₃ Cathode Behaviors in Solid Oxide Fuel Cells

Shen

2014

Fuel Cells

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“…This is consistent with the SEM results, indicating that Cr deposition on the LSCF surface is through interaction with Sr rather than with La, Co, or Fe. Our previous work has also demonstrated that these large particles are SrCrO 4 and they mainly reside on the surface of the cathode [31,32]. The formation of the poorly conductive SrCrO 4 (1.8 Â 10 À5 and 1.8 Â 10 À4 SÁcm À1 at 700 C and 800 C respectively [33]) increases the electrode ohmic resistance by blocking the electrical conductivity path.…”

Section: Microstructuresmentioning

confidence: 91%

Perovskite-type La0.6Sr0.4Co0.2Fe0.8O3, Ba0.5Sr0.5Co0.2Fe0.8O3, and Sm0.5Sr0.5Co0.2Fe0.8O3 cathode materials and their chromium poisoning for solid oxide fuel cells

Shen

2016

Electrochimica Acta

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A B S T R A C TIn the pursuit for solid oxide fuel cell (SOFC) cathode materials that can operate over a wide temperature range, especially at low temperatures such as 600 C, perovskite structure materials La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF), Ba 0.5 Sr 0.5 Co 0.2 Fe 0.8 O 3 (BSCF), and Sm 0.5 Sr 0.5 Co 0.2 Fe 0.8 O 3 (SSCF) are studied. Their electrochemical performance is compared by electrochemical impedance spectroscopy (EIS) at 600 C, 700 C and 800 C for 100 hrs through an AISI 441 interconnect/cathode/yttria-stabilized zirconia (YSZ) electrolyte half-cell structure. The BSCF cathode has the smallest polarization resistance at 600 C, closely followed by the SSCF cathode; the LSCF cathode has the smallest polarization resistance working at 700 C; the SSCF cathode has the smallest polarization resistance working at 800 C, closely followed by the LSCF cathode. From 600-800 C, SrCrO 4 phase forms on the SSCF cathodes near the interconnect while BaCrO 4 phase forms on the BSCF cathodes near the interconnect. For the LSCF cathodes, however, SrCrO 4 phase is only detected at 700 C and 800 C. Cr species diffusion to and poisoning of the cathodes do not directly correlate with the half-cell performance. Lattice constant, stoichiometry, particle size, Cr deposition, and working temperature are important factors to consider.

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“…Moreover, it has good compatibility with LSCF [15,30,31]. In order to decrease the effect of the electrolyte, here we use the same electrolyte for all the three cathode materials.…”

Section: Introductionmentioning

confidence: 99%

Interaction of (La1−xSrx)nCo1−yFeyO3−δ cathodes and AISI 441 interconnect for solid oxide fuel cells

Cited by 18 publications

References 38 publications

Moisture Effect on La_0.8Sr_0.2MnO₃ and La_0.6Sr_0.4Co_0.2Fe_0.8O₃ Cathode Behaviors in Solid Oxide Fuel Cells

Moisture Effect on La_0.8Sr_0.2MnO₃ and La_0.6Sr_0.4Co_0.2Fe_0.8O₃ Cathode Behaviors in Solid Oxide Fuel Cells

Perovskite-type La0.6Sr0.4Co0.2Fe0.8O3, Ba0.5Sr0.5Co0.2Fe0.8O3, and Sm0.5Sr0.5Co0.2Fe0.8O3 cathode materials and their chromium poisoning for solid oxide fuel cells

La0.6Sr0.4Co0.2Fe0.8O3 cathodes incorporated with Sm0.2Ce0.8O2 by three different methods for solid oxide fuel cells

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Interaction of (La1−xSrx)nCo1−yFeyO3−δ cathodes and AISI 441 interconnect for solid oxide fuel cells

Cited by 18 publications

References 38 publications

Moisture Effect on La0.8Sr0.2MnO3 and La0.6Sr0.4Co0.2Fe0.8O3 Cathode Behaviors in Solid Oxide Fuel Cells

Moisture Effect on La0.8Sr0.2MnO3 and La0.6Sr0.4Co0.2Fe0.8O3 Cathode Behaviors in Solid Oxide Fuel Cells

Perovskite-type La0.6Sr0.4Co0.2Fe0.8O3, Ba0.5Sr0.5Co0.2Fe0.8O3, and Sm0.5Sr0.5Co0.2Fe0.8O3 cathode materials and their chromium poisoning for solid oxide fuel cells

La0.6Sr0.4Co0.2Fe0.8O3 cathodes incorporated with Sm0.2Ce0.8O2 by three different methods for solid oxide fuel cells

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Product

Resources

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Moisture Effect on La_0.8Sr_0.2MnO₃ and La_0.6Sr_0.4Co_0.2Fe_0.8O₃ Cathode Behaviors in Solid Oxide Fuel Cells

Moisture Effect on La_0.8Sr_0.2MnO₃ and La_0.6Sr_0.4Co_0.2Fe_0.8O₃ Cathode Behaviors in Solid Oxide Fuel Cells