Structure, electrical conducting and thermal expansion properties of La0.6Sr0.4Co0.8Fe0.2O3−δ–Ce0.8Sm0.2O2−δ composite cathodes

Xu, Qing; Huang, Duan‐Ping; Zhang, Feng; Chen, Wen; Chen, Min; Liu, Hanxing

doi:10.1016/j.jallcom.2006.12.132

Cited by 73 publications

(26 citation statements)

References 21 publications

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“…This result implies that adding the LNO composition into the LSCF cathode is a very effective way to decrease the TEC values at various temperature ranges, especially in the high temperature range. Moreover, in the overall temperature range, the TEC value difference between the LSCF-LNO and SOFC electrolyte materials (SDC, YSZ, LSGM) is generally within the limits acceptable for thermodynamic compatibility (15-20%) [11], indicating a remarkable advantage of the composite cathode design presented in this study. Up to now, the trade-off between electrical conducting and thermal expansion properties classifies the composite cathode containing 30 vol.% LNO as the optimum composition.…”

Section: Original Research Papersupporting

confidence: 54%

“…However, this material suffer from large thermal expansion coefficients (TECs), especially when temperature is higher than 700°C, resulting in a lack of long-term stability in matching with solid-state electrolyte [10]. Extensive research efforts in our group have been devoted to solving this problem by means of adding Ce 0.8 Sm 0.2 O 2-d (SDC) electrolyte to the LSCF to form a composite cathode design [11]. Unfortunately, lowering the TEC is usually coupled with a remarkable decrease in the electrical conducting properties due to the lower electronic conductivity of the SDC composition (10 -2 -1.0 S cm -1 ) in this composite design [12].…”

Section: Introductionmentioning

confidence: 99%

“…The resulting ceramics exhibits moderate averaged TEC around 13.0 × 10 -6 K -1 between 50 and 900°C [18], which matches well with those of SOFC electrolytes. However, the electrical conductivity of the LNO specimens (76 S cm -1 at 800°C) in the IT ranges are below 100 S cm -1 , which is regarded as the minimum requirement in electrical conductivity for an SOFC cathode [11,17].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of La_0.6Sr_0.4Co_0.2Fe_0.8O_3–δ + La₂NiO_4+δ Composite Cathode Materials for Solid Oxide Fuel Cells

et al. 2012

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The structure, electrical conduction, thermal expansion and electrochemical properties of the La0.6Sr0.4Co0.2Fe0.8O3–δ + La2NiO4+δ (LSCF‐LNO) composite cathodes were investigated with regard to the volume fraction of the LNO composition. No chemical reaction product between the two constituent phases was found for the composite cathodes sintered at 1,400 °C for 10 h within the sensitivity of the XRD. Compared to the performance of the LSCF cathode, the LNO composition in the composite cathode plays a role in deteriorating both electrical conductivity and electrochemical properties, however, improving the thermal expansion properties. The trade‐off between electrical conducting and thermal expansion classifies the composite cathode containing 30 volume percent (vol.%) LNO as the optimum composition. For characterizing cathode performance in a single cell, a slurry spin coating technique was employed to prepare a porous cathode layer as well as a YSZ/Ce0.8Sm0.2O3–δ (SDC) electrolyte. The optimum conditions for fabricating the YSZ/SDC electrolyte were investigated. The resulting single cell with 70 vol.% LSCF‐30 vol.%LNO (LSCF‐LNO30) cathode shows a power density of 497 mW cm–2 at 800 °C, which is lower than that of the cell with a LSCF cathode, but still within the limits acceptable for practical applications.

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Section: Original Research Papersupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of La_0.6Sr_0.4Co_0.2Fe_0.8O_3–δ + La₂NiO_4+δ Composite Cathode Materials for Solid Oxide Fuel Cells

et al. 2012

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“…Another way is to add other materials with lower TEC into the cathode, such as electrolyte materials [11,12]. Dyck et al [11] have pointed out that adding Ce 0.8 Gd 0.2 O 1.95 electrolyte to the Gd 0.8 Sr 0.2 CoO 3−ı cathode served to moderate the thermal expansion and resulted in excellent matching to the doped-ceria electrolyte material.…”

Section: Introductionmentioning

confidence: 99%

GdBaCo2O5+δ–Sm0.2Ce0.8O1.9 composite cathodes for intermediate temperature SOFCs

Li¹,

Wei²,

Lü³

et al. 2011

Journal of Alloys and Compounds

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“…Thus, developing cathode materials with high electrocatalytic activity is necessary to ensure oxygen reduction reaction and high oxygen ion conductivity for oxygen transport through the composite cathode at LTs; such cathode materials should also exhibit less thermal compatibility mismatch. Ag, which has excellent catalytic activity for oxygen reduction, is applied in LSCF6428-SDC with 14.4×10 −6 K −1 TEC value [7] to develop an operable LT-SOFC [8]. The use of Ag in composite cathode has been reported by various researchers [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ag on Chemical and Thermal Compatibility of LSCF-SDCC for LT-SOFC

Agun

Bakar

Ahmad

et al. 2015

AMM

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Abstract. In addition to the good electrochemical performance criteria in solid oxide fuel cell (SOFC) applications, cathode material must match thermal expansion with other SOFC components. Thus, effects of Ag on thermal mismatch, chemical reactions, and microstructure are investigated. Ag (1 wt% to 5 wt. %) was mixed with La 0 . 6 Sr 0 . 4 Co 0 . 2 Fe 0 . 8 O 3-δ (LSCF6428) and Smdoped ceria carbonate (SDCC) composite cathode powder. LSCF6428-SDCC-Ag samples were sintered at 600 °C for 2 h. The thermal expansion coefficients (TECs), which were determined using a dilatometer, indicated relatively less TEC mismatch between LSCF-SDCC-Ag cathodes composite and SDCC electrolyte. The average TEC value obtained from 20 °C to 600 °C implied that LSCF-SDCC-A5 (5 wt. % Ag) showed better thermal matching (13.18×10 −6 K −1 ) with SDCC electrolyte (12.84×10 −6 K −1 ) and achieved better compatibility. The X-ray diffraction patterns indicated that the LSCF6428-SDCC-Ag peak increased with the increase in the amount of Ag. Scanning electron microscopy analysis showed that Ag was capable of maintaining the porosity that is required for cathodes (20%-40%). Results showed that Ag exhibited desirable thermal and chemical compatibility with LSCF-SDCC. Thus, LSCF6428-SDCC-Ag can be used as a composite cathode for low-temperature SOFCs.

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Structure, electrical conducting and thermal expansion properties of La0.6Sr0.4Co0.8Fe0.2O3−δ–Ce0.8Sm0.2O2−δ composite cathodes

Cited by 73 publications

References 21 publications

Characterization of La_0.6Sr_0.4Co_0.2Fe_0.8O_3–δ + La₂NiO_4+δ Composite Cathode Materials for Solid Oxide Fuel Cells

Characterization of La_0.6Sr_0.4Co_0.2Fe_0.8O_3–δ + La₂NiO_4+δ Composite Cathode Materials for Solid Oxide Fuel Cells

GdBaCo2O5+δ–Sm0.2Ce0.8O1.9 composite cathodes for intermediate temperature SOFCs

Influence of Ag on Chemical and Thermal Compatibility of LSCF-SDCC for LT-SOFC

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Structure, electrical conducting and thermal expansion properties of La0.6Sr0.4Co0.8Fe0.2O3−δ–Ce0.8Sm0.2O2−δ composite cathodes

Cited by 73 publications

References 21 publications

Characterization of La0.6Sr0.4Co0.2Fe0.8O3–δ + La2NiO4+δ Composite Cathode Materials for Solid Oxide Fuel Cells

Characterization of La0.6Sr0.4Co0.2Fe0.8O3–δ + La2NiO4+δ Composite Cathode Materials for Solid Oxide Fuel Cells

GdBaCo2O5+δ–Sm0.2Ce0.8O1.9 composite cathodes for intermediate temperature SOFCs

Influence of Ag on Chemical and Thermal Compatibility of LSCF-SDCC for LT-SOFC

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Characterization of La_0.6Sr_0.4Co_0.2Fe_0.8O_3–δ + La₂NiO_4+δ Composite Cathode Materials for Solid Oxide Fuel Cells

Characterization of La_0.6Sr_0.4Co_0.2Fe_0.8O_3–δ + La₂NiO_4+δ Composite Cathode Materials for Solid Oxide Fuel Cells