Fast performance degradation of SOFC caused by cathode delamination in long-term testing

Park, Kwangjin; Yu, Sungoh; Bae, Joongmyeon; Kim, Hyungsop; Ko, Yoonki

doi:10.1016/j.ijhydene.2010.05.005

Cited by 109 publications

(49 citation statements)

References 13 publications

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“…The addition of 5 wt.% Ag in LSCF-SDCC gives the lowest TEC mismatch with the SDCC electrolyte at the percentage difference of 2.65% (0.34×10 −6 K −1 ) compared to the LSCF-SDCC with 3 wt.% Ag, 1 wt.% Ag and without Ag which yielded a mismatch of 4.36%, 5.14%, and 4.21% respectively. Therefore, in this temperature range and based on this criterion, the LSCF-SDCC-A5 shows the most appropriate matches and potential to improve the performance of LT-SOFC [4].…”

Section: Applied Mechanics and Materials Vols 773-774 447mentioning

confidence: 97%

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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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Section: Applied Mechanics and Materials Vols 773-774 447mentioning

confidence: 97%

“…A difference in TEC between a cathode and an electrolyte at 7×10 −6 K −1 can result in a 10% chance of delamination occurring at the first 500 h of operational [4]. Therefore, the TEC of perovskite has to be considered and should be matched with the electrolyte to avoid a high mismatch with the electrolyte.…”

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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“…The bonding between solid oxide fuel cell (SOFC) electrodes and metal interconnects is of utmost importance since it may determine overall stack lifetime [1][2][3][4]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Determination of the bonding strength in solid oxide fuel cells’ interfaces by Schwickerath crack initiation test

Boccaccini

Ševeček

Frandsen

et al. 2017

Journal of the European Ceramic Society

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“…The bonding between SOC electrodes and metal ICs is a critical issue, which may determine the stack lifetime [1]. An understanding of the bonding mechanism is essential to design successful ICcathode/anode interfaces in SOCs.…”

Section: Introductionmentioning

confidence: 99%